TRACE™ 700

As a systems and services provider, we understand the challenges of designing the most efficient, lowest cost HVAC system solution. That’s why we developed Trane Air Conditioning Economics, or TRACE™—an award-winning design-and-analysis software program that helps HVAC professionals optimize the design of a building’s heating, ventilating and air-conditioning system based on energy utilization and life-cycle cost.

TRACE 700 helps you compare the energy and economic impact of building-related selections such as architectural features, HVAC systems, HVAC equipment, building utilization or scheduling, and financial options.

Compared with other economic analysis software, TRACE 700 advantages include:

Extensive Modeling Functionality

Choose from over 50 airside systems, air- and waterside economizers, advanced chiller plant configurations, water-source and central and distributed ground-source systems, VRF and UFAD systems, dedicated outdoor-air systems and optimized control strategies. View details...


ASHRAE Standard 90.1 equipment and envelope libraries, gbXML (green build XML) imports, weather files, templates, ASHRAE 62.1-2010 Ventilation Rate Procedure, Building Information Modeling (BIM) and more. View details...


TRACE 700 complies with Appendix G for Performance Rating Method of ASHRAE Standard 90.1-2007 and 2010 for LEED analysis, and was the first simulation software approved by the IRS for energy-savings certification (EPAct).  TRACE is also tested in compliance with ANSI/ASHRAE Standard 140-2011 and 2014.  As such, TRACE is qualified for the 179D Commercial Building Tax Credits. View details...

Support and Training

World-class dedicated engineers and support specialists are available to answer your questions and help you discover the best solution for your HVAC design. TRACE 700 customers can also attend our training classes

The latest release of TRACE 700 focuses on updating and adding to the standard libraries that come with TRACE 700. Use this chart to compare features with TRACE 3D Plus.

What's New in TRACE 6.3.3 (June 2016)

90.1-2013 Libraries  Previously the TRACE library included equipment and constructions for 90.1 – 2004, 2007, and 2010.  This has now been expanded to include 90.1-2013 equipment and constructions.  The upcoming LEED Version 5 will require adherence to 90.1-2013 and these library member will speed up the modeling process for LEED Version 5. 

CVHS Library Trane’s Series S CenTraVac chiller is now available as a cooling equipment library in the program.  This can be found in the water cooled chiller category.  Remember, you can still import Trane equipment selections from TOPSS into TRACE.

What’s New in TRACE 6.3.2

Automatically calculate the ventilation rates for health care facilities. TRACE 700 now offers direct support for the health care facility ventilation standard, ASHRAE 170.  It is now possible to model ventilation in accordance with standard 62.1, standard 170, or a combination of both 62.1 and 170 spaces. 

Model sophisticated evaporative cooling systems and energy recovery devices. The modeling options for indirect and direct evaporative cooling have been significantly expanded in TRACE v6.3.2.  Since evaporative cooling systems commonly work in concert with energy recovery devices, energy recovery options have also been expanded..   

Optimize the operation of the chiller plant controls. Version 6.3.2 of TRACE will allow designers and engineers to run their cooling plants much closer to optimal behavior.  The new Optimal sequencing type operates each chiller at its optimal part load ratio (as defined in the Cooling Equipment Library) and will operate the last chiller between its minimum and maximum part load ratio in order to meet the loop demand. 



The latest version of TRACE simplifies the building energy modeling process for LEED projects.

As the Leadership in Energy and Environmental Design (LEED®) rating system evolves, achieving LEED certification continues to require the most current tools to help maximize credit points. Trane is a LEED automation partner so you are assured that TRACE 700 is continuously being updated to reflect the most recent changes in energy standards, and it meets the requirements for simulation software set by ASHRAE Standard 90.1-2004-2010 and the LEED Green Building Rating System. The software is supported by the TRACE C.D.S. team, the majority of whom are LEED APs or GAs.

Specifically, TRACE 700 can help document compliance with ASHRAE Standard 90.1 or validate the building’s eligibility for LEED certification. TRACE 700 provides multiple features to help model the Performance Rating Method:

  • LEED Automation - automatically submit project data for EAp2, EAc1, IEQ p1 and IEQc2 
  • LEED Guide (view demo)
  • Baseline Building Creator
  • Rotate building automatically
  • PRM fan power calculations found in 90.1-2010
  • Reset hot-water-leaving temperatures
  • ASHRAE Standard 90.1-2004-2010 compliant equipment library
  • Simulate daylighting
  • Estimate cooling coil condensate
  • Calculate ASHRAE 62.1 with DCV based on CO2
  • Reset supply-air temperatures
  • Model extensive air-to-air energy recovery options
  • Detailed output reports for LEED submission
  • Packaged energy rate break-out


LEED credits

TRACE 700 helps to achieve Energy and Atmosphere prerequisite 2 and gain credit points under Energy and Atmosphere credit 1, but there are other credit points TRACE 700 can help attain. Four additional credits lend themselves to the modeling capabilities of TRACE 700.

  • Water Efficiency credit 3
    The Equipment Energy Consumption report shows the amount of make-up water associated with the cooling coil condensate. This information may be helpful in achieving this credit.
  • Energy and Atmosphere credit 5, option D: Measurement & Verification.
    The model used for EAc1 can be used towards achieving this credit. Reference the “International Performance Measurement & Verification Protocol: Concepts and Options for Determining Energy Savings in New Construction Volume III” for detailed information on how to appropriately adjust the model from EAc1 to be used for this credit.
  • Energy and Atmosphere credit 6: Green Power
    The model used for EAc1 can identify the baseline to achieve Green Power credits.
  • Environmental Quality credit 8: Daylighting & Views Credits are awarded when a specified level of daylighting is achieved. When users create daylighting definitions within TRACE, the program generates a special report showing the foot-candles of daylight present in the spaces with daylighting controls.

Release notes

Release 6.3

Release 6.2

[Version 6.3.4] 3/31/2018

This update includes the following items:

  • Added capability to model LED lights
  • Updated 90.1-2007 libraries
  • Updated 90.1-2010 libraries
  • Updated 90.1-2013 libraries
  • Updated F1 help content
  • Added a button on the view results screen to select all reports
  • Fixed an issue where the program was ignoring the user entered cooling coil leaving temperature for a dual duct CV system
  • Updated so ice making chillers reference the secondary power consumed curve in ice making mode instead of the primary power consumed curve
  • The cooling tower report now shows the cooling tower as operating when the system is operating in free cooling mode.
  • Fixed an issue that caused the calculation to crash when sequencing is defined for a plant that only has one piece of equipment
  • Added the “90.1-07 Min Energy Rec (OA pre-con)” energy recovery library member which was missing from the library database
  • Added the “90.1 Non-mechanical Cooling Fan” fan library member which was missing from the library database
  • Fan heat from a series fan powered terminal box fan is no longer ignored by the supply air psychrometric calculations
  • Fixed an issue where miscellaneous data center loads were ignored by the ECB and LEED Summary reports
  • Fixed an issue where the second stage of an ERD was applying the ERD static pressure even when the ERD was not operating and the bypass flag was set to Yes
  • Fixed discharge issue with ice storage
  • Fixed an issue with the ASHRAE 170 calculations for rooms that are listed both in ASHRAE 170 and 62.1; the program was selecting the smaller of the two airflows instead of the larger of the two airflows
  • Updated the cardinal direction report for rotated buildings so the report doesn’t show wall rotations >360 degrees but starts again at 0 degrees.
  • Fixed an issue with the calculation of ventilation airflows for the baseline alternative for a file created in SI units
  • Updated VAV system block terminal airflow calculation so the system level block terminal airflow is never less than the largest supply airflow from any zone on that system
  • Updated the system checksums for the chilled beam system so it reports the OA conditions from the time of block peak instead of the time of peak for the first room on the system (only affects the reported OA conditions, not the capacity)
  • Fixed an issue where decreasing the wind velocity in the weather library was causing higher cooling and heating loads when the loads should be lower with decreased wind velocity
  • Fixed incorrect reporting of zero unmet hours for the proposed alternative on the LEED Summary report
  • Updated the adjacent floor heat transfer calculation to use the cooling driftpoint temperature instead of the cooling setpoint temperature of the adjacent space for worst case
  • Updated the (USEALT1FANSIZES) flag to work when both alternatives are run consecutively
  • Fixed an issue where the economizer control point was sometimes incorrect for zone level systems
  • Fixed an issue where the recurring costs entered in units of $/kW were calculated as though they were entered in units of $/ton
  • Updated the interior fan demand on the LEED Summary report to include the optional ventilation fan demand even when it is calculated separately and not included in the PRM fan demand peak
  • Updated the scan for errors validation message for ASHRAE 170 spaces to list only the spaces that appear in both ASHRAE 170 and ASHRAE 62.1
  • Prevented over/undersizing from being double accounted for in displacement ventilation system causing excess return airflow
  • Updated code to do conversion between standard and actual air so airflows balance
  • Updated code to force “retest peaks” to be turned on in change load parameters when direct dehumidification is selected so heating coils can be properly sized
  • Increased number of allowable surfaces for daylighting calculation from 10,000 to 20,000.
  • Updated single zone VAV system so cooling supply airflow is not oversized for heating dominant system with entered heating supply air temperature
  • Prevent frost prevention coil for an ERD from calculating positive (cooling energy) value when the return air temperature is larger than the frost setpoint
  • Added the adjacent floor load to the cooling coil selection capacity
  • Fixed an issue where biquadratic curves used to define the ambient and capacity unloading curves for equipment with chilled water reset caused chilled water reset to have no impact on the chiller consumption
  • Updated ventilation calculations when DCV is applied to use the lower of the DCV ventilation or the 62.1 ventilation
  • LEED report now breaks out electric and gas receptacle loads into two different line items
  • When importing a chiller from TOPSS, program no longer populates incorrect value for optimal part load ratio
  • Fixed TOPSS import crash
  • Prevented double accounting for the secondary airflow of a parallel fan powered VAV system when calculating the percent outside air
  • Fixed an issue where the domestic hot water base utility was ignored when there is more than one boiler assigned to a plant with no capacity specified
  • No longer ignores the entered heating supply cfm for a VRF system when the heating supply temperature is blank
  • Prevented direct dehumidification operating unnecessarily when there is an energy recovery device
  • Weather library report has been updated to show the humidity ratio in units of lb/lb instead of gr/lb
  • Room entered values report has been updated to show lighting power density values out to 3 decimal places
  • Fixed an issue where the monthly utility cost report converted  the building area to metric twice for files created in metric
  • Updated the library entered values report to round people based ventilation rates to one decimal place and area based ventilation rates to two decimal places

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[Version 6.3.3] 5/13/2016

This update includes the following items:

  • Library expanded to include ASHRAE 90.1-2013 equipment and constructions
  • Trane Series S CenTraVac chiller is now available as a cooling equipment library
  • Variable Refrigerant Flow (VRF) curves fixed
  • Updated VRF libraries
  • Updated 90.1-2004 libraries
  • Updated 90.1-2007 libraries
  • Updated 90.1-2010 libraries
  • Updated F1 help content
  • Now when the psychrometric loop doesn't close, the SADB is reset to 55 unless the user has fixed the supply airflow
  • The ERD can now reduce the size of both the preheat and main heating coils during design calculations
  • Auxiliary heating coils can now reheat a room that is in heating when the system is in cooling to limit unmet heating hours
  • Evaporative precooling fields are now available for Load Only mode when evaporative cooling is allowed at design in the Change Load Parameters screen
  • Heating only systems can now have a heating and cooling DOA
  • During free cooling, the pumps can now continue to run even when the chiller is not running
  • Oversizing due to the VAV minimum being greater than the calculated system block airflow is no longer ignored
  • The cooling cfm is no longer oversized to match the ventilation cfm when the ventilation is set to room direct
  • Updated the scan for errors so it no longer states that 62.1 is required on the PRM baseline, only the ECB baseline
  • The no. people/1000 sq ft on the room checksums report can now accommodate 4 digits instead of 3
  • The global construction template now allows floor to floor heights greater than 20 ft
  • Added a warning message to alert the user when updating the baseline rooms, all the rooms will be unassigned from the systems
  • The RTS (heat balance) calculation method is now limited to 200 surfaces instead of 110.
  • The Optimum Stop controls only look at the last occupied hours now when the schedule is set to Available (100%)
  • SZVAV system now increases SADB at max airflow when load increases to prevent unmet heating hours
  • Supply airflow can now be calculated based on heating load for heating dominant systems to prevent undersizing in heating
  • The optimal unloading part load ratio is now available in the library for air cooled chillers, not just water cooled chillers
  • Corrected an issue where the ECB and LEED Summary reports showed conflicting electric cost when there are negative base utilities
  • Corrected an issue with over calculating the lighting load when the return air path is set to ducted
  • The bicubic curve no longer incorrectly uses the condenser entering temperature instead of the condenser leaving temperature for the EIR-FPLR curve
  • The PFPMBO system now uses the zone level heating SA cfm value for both the diffuser and VAV box on the system component selection report
  • Resolved a conflict in ASHRAE 62.1 and 170 calculations that caused blank values on the checksums reports
  • Fixed an issue where the program calculated zero ventilation when 62.1 and 170 ventilation rates were input
  • Fixed a problem with missing VRF fan heat in the reports
  • Corrected an issue with the LEED Summary report showing the wrong % savings
  • The adjacent room transfer airflow now includes the latent component on the checksum reports
  • Resolved a problem where heating plant sequencing caused the calculation to crash during the equipment simulation
  • Resolved a runtime error when opening the Graph Profiles and Energy
  • Excess pages generated in the Systems Entered Values report have been eliminated
  • Resolved a crystal reports error when opening the Plants Entered Values Report when the project includes a refrigerant economizer
  • Corrected an issue where the 90.1 NMC fan ignored its reset and lock out table when the project includes adjacent air transfer
  • Fixed a problem with the Graph Economics tool which was missing data and repeating months
  • Fixed a problem with the Component Tree view which was missing schedule dropdowns
  • Resolved an issue in the rate structure library with metric units where the electric demand and consumption values increased when saved
  • Resolved an invalid argument error when clicking the options button for the stage 1 energy recovery device
  • Corrected an issue where SZVAV system level coil airflow did not match the fan airflow when the supply airflow is entered at the room level
  • Corrected an issue where a plant level cooling tower consumed too much energy when the tower curve was not a polynomial and capacity was not entered as a %
  • The ambient modification curve is no longer ignored by heat recovery (non-geothermal) chillers
  • Corrected an issue where the optimal part load ratio was not calculated when the field was left blank in the cooling equipment library
  • Corrected an issue where the user entered off cooling coil temperature was ignored when the psychrometric loop didn't close
  • Fixed a problem where the block cooling airflow was entered for a VAV system and then the system type was changed to CV and still referenced that entered block cooling airflow
  • The calculation no longer crashes while copying room assignments when the baseline alternative is updated
  • Resolved a variable conflict in the new data center evaporative cooling that caused cooling equipment to ignore the liquid desiccant conditioner load
  • Resolved an issue with evap cooling that caused the liquid desiccant conditioner to ignore the desired leaving humidity ratio input
  • Replaced the missing condenser fan library in the "Trane Voyager VAV Rooftop" cooling equipment
  • The cold deck SA is no longer incorrectly set to the supply air humidity ratio instead of the cooling coil leaving humidity ratio for dual duct systems
  • The base utility demand is now correctly converted for the plant oversizing calculation
  • Corrected an issue where the pump energy is calculated as a negative value when the library uses units of watts/gpm
  • Corrected a problem that caused zero OA for passive beams and DV chilled ceilings
  • The ERD can no longer overheat the air causing unnecessary cooling loads in winter
  • Corrected an issue where the waterside economizer couldn't operate enough because chilled water reset curve was ignored reducing the operating hours for the waterside economizer
  • Unmet heating hours didn't match on the ECB and LEED Summary reports when there were unconditioned systems
  • Corrected an issue that caused the PRM fan rule disallowing the effect of ERD static pressure on fan energy to be applied even when the PRM fan calcs were not applied
  • Fixed an issue where the GBXML export doesn't match the room checksums for airflow
  • Resolved a Fortran error when importing .tm3 or .epw weather files
  • Resolved a LEED Summary report crash when the base utilities don't match on the proposed and baseline
  • The ERD dew point set point is no longer ignored and the series coil loop placed on the ROA deck can now control room relative humidity
  • Fixed an issue where the people diversity is no longer ignored for single zone 62.1 calculations
  • Corrected an issue where high internal loads scheduled during heating design did not zero out the heating coil size when no heating was necessary at design
  • Corrected an issue where the ventilation fan was missing on the PRM fan power detail report
  • Corrected an issue where daylighting calculations ignored the effect of external shading
  • Fixed a problem where the enthalpy ERD did not modulate even when the part load method was set to modulated
  • Fixed a problem where the enthalpy ERD did not include the return fan heat when a return fan static pressure was entered
  • Corrected an issue that caused the UFAD return air temperature to be calculated incorrectly
  • Fixed a problem where the system block airflow was ignored for UFAD SFPVAV systems
  • The chilled water pump energy is no longer double accounted for a VAV pump when the chiller is not operating but the ice storage is operating

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[Version 6.3.2] 9/13/2015

  • ASHRAE 170 calculations are now supported
  • Dramatic improvements have been made to evaporative cooling modeling
  • Special energy accounting has been added for data center equipment
  • Chillers can now be sequenced using the optimal sequencing method


  • Updated the equipment cycle point controls for curves that are entered as a table.
  • Updated the economizer controls to account for ERD effects
  • The equipment energy consumption report will now inculde required fans that have type equal to "None"
  • Updated the ERD and economizer controls so that they now operate in a more cooperative manner
  • LEED summary report updated so that having base utility descriptions in a different order between alts will no longer cause a crash
  • It is now possible to run simulations without a cooling plant.  Typically used with heating & ventilaiton only systems
  • Added units of cfm/sf and lps/sm to the infiltration UI
  • The scan for errors now includes some situations that require 'Retest Design Peak' to be checked
  • For all UFAD and DV systems, the user should never specify the clg coil leaving.  User inputs to lock-in these temps will be ignored
  • Updated the checksums report to account for two stage energy recovery
  • It is no longer necessary to rotate the baseline to get access to the LEED reports
  • Adjacent building shading is now copied to baseline buildings when modeling for 90.1-2010
  • It is now possible to lock the header in place in the visualizer
  • The VRF condenser min. operating temp field lower limit has been changed from 0 to -35
  • VRF default return airpath is now 'Room direct'
  • F1 help and the users manual updated
  • Static pressure adjustments now have an indicator to show that they are present
  • Loss coefficient for slab on grade is now called F-factor
  • The plant wizard is now available in chiller plant analyzer alternatives 2 thru 4-Added window direction to the component tree view
  • People per 1000 sq. ft. has been added to the room checksums (to help with LEED modeling)
  • An install type designator has been added to the version number (network vs stand alone)
  • New evaporative cooling library memebers have been added
  • Improved the way DOA units use energy recovery devices
  • Corrected an issue with the proration of heating coil capacity overrides at the room and zone level
  • Improved the system level cooling coil calculations when there is cooling demand in some rooms, but not others
  • Fan parameterization now works for VAV systems
  • Active chilled beam aux airflow calcs were improved to better account for natural convection
  • Corrected a load accounting issue between the reheat coil and the main heating coil during dehumidificaiton
  • When "ECB\PRM fan rules" is not selected, the same ERD SP is now applied to both alternatives
  • ERD static pressure effects are now ignored in the PRM alternative
  • Improved the % sensible to occupied layer calcualiton for displacement ventilation systems
  • Corrected a problem with the sizing of zone level heating coils in PFPVAV systems (room and system levels were unaffected)
  • Refrigerant migration can now be used in conjunciton with an optimized tower
  • Optimum start now functions correctly for SZVAV systems
  • Updated the visualizer to correct an airflow reporting problem
  • Corrected an issue with 62.1 airflow calcs when a VAV system was pushed to 100% OA
  • Bypass VAV systems will now provide the correct heating return airflow temp
  • Corrected an issue that could cause coil sizing units of "% ventilation and room latent" to be ignored when vent airflow was set to 0.
  • Corrected a problem that could cause the PFPVAV system to ignore coil oversizing at the zone level when the calcualted heating airflow was too low
  • Adjacent room partition area is now correctly accounted for when using room and floor multipliers
  • Corrected a problem when modeling displacement ventilaiton w/ chilled ceilings where the space sensible loads were being incorrectly assigned
  • Corrected a problem with bicubic unloading curves
  • Excess condenser heat is now rejected when using heat recovery chillers
  • Design airflows are now limited to system block airflow when appropriate (rather than sum-of-peaks)
  • Corrected a static pressure issue associated with ERD's with bypass dampers
  • Heating only systems now correctly account for fan heat
  • Corrected a control issue that could occur when nearly all the space sensible load is assigned to the plenum
  • Corrected an issue that could cause return airflow vaues to be incorrect for UFAD PFPVAV systems when running in bypass mode
  • Corrected a weather profile issue during dehumidificaiton
  • Improved the duct leakage calculation for UFAD PFPVAV systems
  • Changed the way floor load is calcualted for UFAD VAV systems
  • Corrected an issue with UFAD VAV airflow calcs that could cause the coil and diffuser airflows to be different
  • Corrected a problem with the PRM Fan Power report that could occur when the room exhaust fan showed up first in the room description \ Fan name list
  • Improved the chiller load-based sequencing  

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[Version] 9/19/2014

This update contains the following items:

  • Added LEED Automation for IEQ P1.
  • Added LEED Automation for EA P2.
  • Added ASHRAE 90.1-2010 baseline building creator.
  • Added ASHRAE 90.1-2010 Appendix A assembly and construction library members.
  • Added ASHRAE 90.1-2010 baseline systems 9 and 10, heating only systems.
  • Added LEED Guide V4 on screen help.
  • Added Single Zone ventilation calculation for zone level coils.
  • Added new fan: Direct Drive AF Var Freq Drv.
  • Added Direct Dehumidification during heating mode/Unoccuiped Hours now in Change Energy Parameters (removed from T700simsettings).
  • Added LEED Energy Type in Base Utility library: Mapped to LEED Report Base Utilties = Process or Non-process.
  • Added ASHRAE/LEED reports tab (organizes ASHRAE and LEED reports along with LEED Automation pdfs on one screen).
  • Added energy recovery now shown on the equipment energy consumption report.
  • Added Greensleeves geothermal report to T700simsettings.
  • Added IEQ Credit 2 increased ventilation calculation.  Auto setback to minimum OA rates for baseline.
  • Added non-mechanical cooling for room exhaust.
  • Added Liebert refrigerant economizer added to the standard library.
  • Added 90.1 riding the pump curve library member.
  • Added installation instructions to the install wizard. 
  • Updated Start Menu; New File Wizard on startup, re-grouped New/Existing/Help.
  • Updated flow for Baseline building creator when updates to the proposed are triggered.
  • Udated baseline building creator now templates lighting power densities even if they were untemplated in the proposed.
  • Updated gas consumption on LEED report to now default to therms and therms/hr for IP units.
  • Updated LEED report: summary for energy now sums in MMBtu/hr.
  • Updated LEED report: summary now includes a sumation of process loads.
  • Updated ASHRAE 62.1 report to show zone level fans at the "system ventilation parameters" output.
  • Updated ventilation output in the visualizer now includeds economizer airflow.
  • Updated ASHRAE 90.1 Baseline Systems 6 and 8 (PFPVAV MBO)now auto size secondary fan to 50% design airflow.
  • Update -packaged breakout "severe warning" when compressor power is less than 30% of total.
  • Update - 90.1 Static adjustment window added for more accruate baseline static adjustment calculations.
  • Moved air to air energy recovery parasitic energy to the "fan energy category" (moved from receptacle energy).
  • Updated gbXML code to properly import Revit 2015 files.
  • Increased cooling tower approach to 50F temperature difference.
  • Added "fan cycling" to entered values (systems).
  • Added when people averaging = Yes, Population diversity = 100% and is grayed out

  • Fixed the incorrectly grayed out  "Update ASHARE 90.1 Baseline"  when a .TAF file was opened for the first time.
  • Fixed system component selection report to correctly capture DOA units that were switched to zone or room level.
  • Fixed when baseline systems 3-8 using climate Zone 3B were bringing in the incorrect economizer "on" point.
  • Fixed the baseline building creator not correctly converting metric 62.1 rates when auto populating a metric 90.1 baseline.
  • Fixed incorrect OA CFM on checksum for fan powered systems.  Reporting error only, the correct value is used in the calculation.
  • Fixed: When using a liquid desicant air to air energy tranfer device the "user defined" leaving temp was only working when the leaving temp of the desicant was greater than the setpoint.  Code has been fixed to reach the setpoint at all hours.
  • Fixed export for The Design Cooling Capacity Report
  • Fixed the entered value report "Library Members" from incorrectly reporting cooling design as heating design.
  • Fixed when cooling VAV minimum was very small, or zero, the calculation incorrectly allowed cooling supply air dry bulb to be a vary large number when it should have been limited to return/OA dry bulb.
  • Fixed an issue with PFPMBO secondary ariflow calc (and heating coil capacity) when calcuated as (HeatingCFM-RHcfm)>RhCFM.
  • Fixed issue %OA Htg for SFPVAV changed to (VentilationHtg / Primary fan airflow)*100 which will also equal (VentilationHtg / RhCfmHtg)*100.
  • Fixed an issue with Plate and Frame HX not showing enough savings (minor, less than 2 percent)
  • Fixed issue in the bypass variable reheat system when the cooling coil was only seeing the cooling to space supply airflow instead of cooling to space supply plus bypass airflow.
  • Added diversity to zone level coils because any system serving multiple ventilation zones can take into account ventilation diversity.
  • Fixed an issue on the Design Airflow Report for Room Exhaust.
  • Return air bypass will now be disabled during any hour when the economizer can meet all the cooling load
  • Fixed a problem where Unit vent and unit heater systems would underestimate the amount of heating savings from an ERD wheel
  • Fixed an issue with the system analyzer to TRACE import feature.  The plants section was crashing the import process.
  • Fixed issue when a user enters a slab on grade floor, the construction type which is grayed out, is being reported on the LEED summary report
  • Fixed issue with sizing a pump entered as Watt/GPM when more than one boiler was present.
  • Fixed issue when system exhaust sizing was not taking into account adjacnet airflow out of the system.
  • Fixed issue with all economizers (enthalpy, dry bulb, wetbulb) incorrectly bringing in outside air during the winter, during unocuppied hours, for hours when heating only is required.
  • Updated the minimum condenser entering for refrigerant migration from 38F to 32F.  Took out the maximum ambient temperature limit.
  • Increased the max vertices per window from a gbXML import.  This was causing TRACE to crash when a window had more than 8 vertices.
  • For PFP mixing box outlet the mixing temp between the plenum and supply air stream was incorrect when the CLDBc was > Planeum DB
  • Fixed issue on temperature and humidity reports when a room was "unconditioned".  Report was showing "999" for max values.
  • Fixed the UFAD system from incorrectly using sum of main plus reheat instead of larger of main or reheat.
  • Fixed issue when Aux coil was added to a radiant system the main heating coil was not taking the remainder of the load (as it should).
  • Fixed ssue with supply air reset without a max reset, the preheat coil and cooling coil were running in the same hour.
  • Fixed mapping for eplus update that changed the geo hx object, which in turn made GLD/GLHE pro exports for TRACE inaccurate.  
  • Fixed the Walls by Direction report from incorrectly using the floor/zone multiplier on all walls for a room with one wall having a mutliplier.
  • Fixed EEC report to correctly reflect the heating mode demand for air to air heat pumps (only effected the EEC report)
  • Fixed issue with ambient unloading curve for air-to-air heat pumps incorrectly setting to Water Cooled

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[Version 6.3.0] 9/6/2013

This update contains the following items:

  • Added LEED Guide, a step-by-step guide on modeling for LEED V3.
  • Added baseline building creator, a one-step process for building a minimally compliant building, according to Appendix G 90.1-2007.
  • Added ASHRAE 90.1-2007 Appendix G baseline systems. (Systems 1-8)
  • Added IPAK Standard and High-Efficiency Air-Cooled Unitary library members.
  • Added IPAK Variable-Speed eFlex Air-Cooled Unitary library members.
  • Added Trane VRF Heat Pump and Heat Recovery units.
  • Added Walls by Cardinal Directions report.
  • Added full load rates for accessories on the Equipment Energy Consumption report
  • Updated LEED report - Lighting (w/Sq Ft) broken down by space type; base utilites broken out in Section 1.6; updated headings to align with LEED v3.
  • Updated Metric load rates in customized settings.
  • Updated rate structure to allow negative values.
  • Updated the 62.1 report to show all zone Vot when a zone level coil is present.
  • Updated Fan Coil systems to be calculated using ASHRAE 90.1-2007, Appendix G, system 1 when used in a baseline system with PRM Calc turned on.
  • Updated the adjacent building shading algorithm for the Southern hemisphere.
  • Updated the RTS calculation method (radiant fraction).
  • Updated the TRACE 700 weather import to allow expanded .epw weather files.
  • Updated the optimum start calculation.
  • Fixed RTS table lookup load methodology when %glass = 100.
  • Fixed Schedule Editors so no overlap of time is allowed.
  • Fixed hot gas reheat calculation; the proportion of ambient was not correct.
  • Fixed an error in the ASHRAE 62.1 calculation that allowed the VAV min to fall below Vbz/Ez.
  • Fixed the PRM fan report to allow Fan Coil systems to be displayed.
  • Fixed the Library input value report for heating design.
  • Fixed an error in the code for UFAD systems when adjacent floors are used.
  • Fixed an error in air-to-air energy transfer devices that used bypass dampers. Static pressure of the ERD was still being applied.
  • Fixed a reporting error for the Bypass Variable Reheat system; the heating mode CFM was incorrect.
  • Fixed an error in the Displacement Ventilation system with Room Induction; the time of capacity peak was incorrect.
  • Fixed an error when room exhaust was entered as 100%.
  • Fixed an error with Displacement Ventilation when an Aux cooling coil was added.
  • Fixed the Auxiliary losses to plenum; incorrect air temperature to plenum.
  • Fixed the weather override "standard" default; it was not properly converting to metric units.
  • Fixed the cooling airflow for Rooftop Multizone system.
  • Fixed an error in the cooling coil peak when both retest peaks was turned off and main coil capacity was equal to "% design minus aux capacity".
  • Fixed a GUI issue associated with the generate button for ambient modification curves.
  • Fixed a reporting error on the system component selection report, Primary fan %OA.
  • Fixed the chilled beam sizing when "% of ventilation and room latent" was selected for the aux coil capacity.
  • Fixed the Plant Wizard-Ice storage thermal storage multipliers.
  • Fixed an error for free-cooling plate-and-frame heat exchanger where both the condenser pump and free cooling pump were operating at the same time.
  • Fixed an error that was causing incorrect results when a heating only system was added to a system with supply air temperature reset.
  • Fixed the design cooling capacity reports to show aux capacity.
  • Fixed an error that incorrectly divided the energy rate for fluid coolers by the number of cells entered on the heat rejection library.
  • Fixed an error in the heating coil oversizing for constant volume systems.

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[Version 6.2.10] 2/28/2013
This update contains the following items:

  • Added "Close ventilation dampers during unoccupied hours" to the Project Input Values report
  • Updated the TRACE calculation to prompt a Fatal Error when 2+ ground loops are present on the same alternative.
  • Updated the SZVAV control to be more accurate in the dead band.
  • Fixed an issue where lighting and miscellaneous loads were being counted as "unconditioned" because the heating coil capacity was zero.
  • Fixed the system component selection report to accurately display the number of VAV boxes in a Single Zone VAV system.
  • Fixed an error where ERD's were not being accounted for at design.
  • Fixed an error when the ambient relief curve was input using SI units.
  • Fixed a control error in the DCV control.
  • Fixed the UFAD economizer control. The economizer control point was not taking the underfloor heat pickup into account and therefore not running the economizer enough.
  • Fixed the LEED report for thermal storage. The LEED report was not correctly displaying thermal storage.
  • Fixed the optional ventilation coil sizing when the Heating Coil was set to zero.
  • Fixed the heat rejection type for the VRV condensing unit.
  • Fixed the building areas report incorrectly showing Glass % instead of Skylight %.
  • Fixed the energy type on the LEED report for purchased hot water.
  • Fixed the ERD leaving temperature which was sending too high a temperature to the preheat coil.
  • Fixed the primary chilled water pump for VS WSHP.
  • Fixed the holiday day type in the visualizer; it was not being displayed.
  • Fixed the cogen curves when they were entered as KW/MBH. Incorrect conversion.
  • Fixed the fan energy calculation when: ERD = room exhaust, rotate and average was selected, and no PRM calculation was selected.
  • Fixed the heating mode ventilation % when both system block airflow and system ventilation override were selected.
  • Fixed the gbXML import for slab on grade.
  • Fixed the diffuser outflow on the airflow balance report.
  • Fixed the fan sizing calculation when static pressure equaled zero.
  • Fixed the LEED report when zone and floor multipliers were used. The W/SqFt output was not correct.
  • Fixed the LEED report for KW Demand on WSHP systems.
  • Fixed the Air to Air Heat Pump curves.
  • Fixed the "Save As" feature that would crash when the user hit "Cancel".
  • Fixed the ECB report to include the cogen miscellaneous equipment.
  • Fixed the % load to return air. It would not allow 100% load to return air.
  • Fixed the cooling tower wetbulb reset. The control would occasionally ignore the wet bulb reset.
  • Fixed the ventilation reset that underestimated the amount of reset possible.
  • Fixed the parasitic energy consumption being greater than zero when the economizer was running.
  • Fixed the 90.1 PRM Calculation; it now includes input for non-primary fan static adjustments.
  • Fixed the return air calculation when upstream leakage fraction was selected.
  • Fixed the main heating coil capacity override.

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[Version 6.2.9] 10/3/2012
This update contains the following items:

  • Added kWh/Ton-hr metric to the economic summary report. This measures the plant's overall energy efficiency.
  • Added 90.1-2010 library members.
  • Added a diagnostic error message to display when a WSHP loop is missing thermal storage

  • Updated both evaporative and dry fluid cooler calculations. The updates are based on EnergyPlus algorithms.
  • Updated 90.1-2010 Heat Pump library members to comply with IC 90.1-2007-09 of ANSI/ASHRAE/IESNA (Operation between 40F-17F).
  • Updated the default cooling tower throttling value. Changed from 5F to 0.5F.
  • Updated the cooling equipment tab to allow a condenser water pump for each chiller when a plant level cooling tower is applied.

  • Fixed the economizer control point for SZVAV. It was incorrectly setting the control point too low, causing excess ventilation during the winter months.
  • Fixed the duplicate entries in the LEED summary report.
  • Fixed an error in the secondary fan design heating airflow. This occurred when a fan-powered system type was specified, but some VAV boxes were turned to "Shutoff VAV".
  • Fixed the chilled water pump(s) incorrectly staying off when the lead chiller is scheduled off but the remaining chillers are scheduled available during an hour when Thermal Storage has met the entire cooling load.
  • Fixed the export gbXML output on the file drop-down menu.
  • Fixed a "divide by zero" error in the visualizer that was causing the "Bldg Elec Monthly Energy Costs by Equip" to go to infinity.
  • Fixed the "plants" entered values report which was incorrectly displaying pump power.
  • Fixed a reporting error on the system component selection report that was missing the main heating coil for PFPVAVMBO.
  • Fixed an operational change that occurred in version The heating airflow is now allowed to go higher, but not more than the heating VAV max airflow, and the fan will cycle higher as a result.
  • Fixed an error in linking the airside coil capacities to the plant capacity.
  • Fixed a reporting error on the room checksum report. The main heating coil was inadvertently adding the reheat coil capacity to the main heating capacity.
  • Fixed a calculation error in the VRH system. The system was not maintaining drift point control during unoccupied hours.
  • Fixed the ducted return air temperature in a BPVAV system that was causing excess exhaust heat load.
  • Fixed the ventilation load on the system checksum report to reflect the use of ERDs.
  • Fixed the 62.1 Ep value for VAV systems. When a hybrid (shut-off + Fan powered) system was created, the 62.1 report was not updating the shut-off VAV Ep values.
  • Fixed the Er value for PFPVAVMBO systems in the 62.1 report. The default was changed from 0% to 30%.
  • Fixed the UFAD system design cooling coil leaving temperature.
  • Fixed the plant chilled water pump sizing to correctly use the chilled water evaporator leaving temperature when W/gpm is selected.
  • Fixed the system component selection report to properly report the amount of secondary fans and shut off VAV boxes in the system.
  • Fixed system types VAVBB Skin heating and VAV Forced flow skin heating to have reheat coils.
  • Fixed the reporting of miscellaneous pump energy in the LEED report.
  • Fixed ERD control with frost prevention to decrease gas usage.

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[Version 6.2.8] 3/30/2012
This update contains the following items:

  • Added a new Single Zone VAV (SZVAV) System.
  • Added the ability to simulate a dual VAV cooling/heating minimum feature for all systems that use reheat minimum to control the cold deck airflow at minimum load.
  • Added five Mexican weather libraries with the origin filetype appended to the name.
  • Added the ability to export a COMNET XML file for LEED submission on the COMNET website.
  • Added VAV IntelliPak and Voyager rooftops in the cooling equipment library.
  • Added the ability to view the LEED Summary Report if the economics portion is not calculated.
  • Added two new air cooled chiller/ice storage templates for the Plant Wizard.
  • Changed conversion for ft. of water in Rate Structure Library.
  • Changed the LEED Summary Report to not show the optional ventilation fan if the fan type, flow rate, or static pressure is not selected.
  • Changed the Utility Rates Library to allow six significant digits after decimal.
  • Fixed an error that did not let the user change the U-factor of a copied door.
  • Fixed an error that reported excessive tower makeup water in the WSHP loop.
  • Fixed an error that prevented the cooling tower unloading curve to unload correctly when using kW units.
  • Fixed an error that incorrectly calculated the dry cooler energy consumption when set as a heat rejection device.
  • Fixed an error that did not account for skylight load in duplicate rooms per zone.
  • Fixed an error that did not account for the main heating coil when an auxiliary coil was added and the coil capacity was modified.
  • Fixed an error that prevented the psychrometric report airflow to match with the checksum report airflow when Standard 62.1 was applied in the system.
  • Fixed an error that did not account for the shutoff mode in fan powered VAV system.
  • Fixed an error that did not consider the room humidity ratio from psychrometrics when calculating ventilation latent load in a few circumstances.
  • Fixed an error that did not include the ventilation load when sizing a radiation heating coil if a preheat coil did not exist and ventilation deck was something other than Room Direct.
  • Fixed an error for Mexican weather files due to unit conversion error that presented very low humidity ratio values.
  • Fixed an error that duplicated the ventilation when ventilation units were %Clg Airflow and the cooling supply airflow was entered in cfm units.
  • Fixed an error where fan cycling was only partially turning down the fan for mixing systems.
  • Fixed an error that defaulted to the library pump flow rate value when the hot water pump rate was entered as zero. User must select “none” in the pump field.
  • Fixed an error in the Visualizer that did not reduce the electric demand when lighting demand was unselected from the graphs.
  • Fixed an error that under-reported heating loads when VAV system preheat coils were manually undersized.
  • Fixed an error where units of Hp and kW/cfm were not being converted correctly.
  • Fixed an error that did not use the Vertical bore imported by the user.
  • Fixed an error that incorrectly sized the chiller when only a base utility was assigned to it.
  • Fixed an error that calculated incorrect energy consumption when a dry cooler was selected as a heat rejection device and a fluid cooler was selected as a free cooling device.
  • Fixed an error that did not show the cooling tower heat rejection in the geothermal summary report.
  • Fixed schedule graphs that were not graphing correctly.

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[Version 6.2.7] 7/8/2011

This update contains the following items:

  • Added the ability to import epw weather files.
  • Added two new room types.
  • Added the ability to enter negative numbers for the LEED Fan Power Adjustment value.
  • Added ventilation library members to increase the ventilation CFM by 30% over the minimum ASHRAE 62.1 to gain the credit for LEED IEQ Credit 2.
  • Updated the Environmental impact information.
  • Added geothermal library members.
  • Expanded the cogen library to include two new members.
  • Added the ability to modify system profiles.
  • Fixed an error preventing the copying of glass with no dimensions or percent in the file wizard.
  • Fixed an error that incorrectly changed the block load on a VRF system between the design and simulation phases of the program.
  • Fixed an error that incorrectly reported too much backup heating on geothermal systems with variable volume chilled water pumps.
  • Fixed an error that prevented the internal shading parameters from being shown on alt 2.
  • Fixed an error that prevented an energy recovery wheel from operating when the main supply cfm is specified.
  • Fixed an error that prevented Trace from using more than one boiler when the "link airside coil capacities.
  • Fixed an error where adjacent floor plenums caused the space load to peak in odd months when retest peaks flag was set.
  • Fixed an error that would crash Trace when condenser water reset was selected and building rotation was enabled.
  • Fixed an error that caused UFAD systems to generate huge supply airflows when Std.62.1 flag was set and retest peaks flag was set.
  • Fixed an error that resulted in the chilled water pump energy to be doubled when multiple chillers are attached to the same plant.
  • Fixed an error where Trace was using the design dry bulb temperature instead of the ground temperature for the partition delta T.
  • Fixed an error that caused excessive heating on sfpvav systems when using the "Supply Air Reset Per Worst Case Room" with the "Use system default outside air reset" checked off.
  • Fixed an error that prevented a VRF system from rejecting heat to purchased chilled water instead of a condenser.
  • Fixed an error that caused the VAV reheat minimums to be too high when the system is oversized with respect to the sum of the peak airflows.
  • Fixed an error that prevented the main cooling coil from being turned off for two pipe system configurations.
  • Fixed an error that resulted in two small of makeup water values in direct evaporative systems.
  • Fixed an error that resulted in the number of people being multiplied by 100 when the 62.1 diversity field was left blank.
  • Fixed a reporting error that displayed the wrong system type on the ASHRAE 62.1 report when a VAV system with baseboard heat was selected.
  • Fixed an error that cased the design airflows in the PRM alternative to be incorrect if Packaged EER or Packaged COP were selected.
  • Corrected the condensate return pump energy units.
  • Corrected the U-value for an external door.

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[Version] 10/05/2010

  • Fixed an issue where the auxiliary heating equipment is not being used when condenser loop temperatures drop below their minimum.
  • Fixed an energy value issue that reduced the energy usage on the LEED Summary report by a factor of 1000.
  • Fixed an issue that omitted the usage of purchased steam on the LEED Summary report.
  • Fixed an issue that displayed the averaged unmet hours for the baseline alternative rather than the zero-degree rotation on the LEED Summary report.
  • Fixed an issue that added the geothermal pump power to the auxiliary cooling and heating energy usage on the Energy Summary report.
  • Fixed a problem that caused unmet hours when using VRV/VRF airside systems and blank VAV minimums.

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[Version 6.2.6] 9/1/2010

This update contains the following items:

The Fuel Source and Reject Condenser Heat to Reference Type fields have been updated to Heating Plant and Heat Rejection Equipment, respectively for:

  • Air to Air Heat Pump
  • Air to Air HP w/ Demand Defrost
  • VRF Heat Pump
  • VRF Heat Pump (digital scroll)
  • VRF Heat Pump (Variable Speed Compressor)
  • Default Water Source HP
  • Ground Source HP – High Effic
  • Ground Source HP – Reg Effic
  • Water Source HP – High Effic
  • Water Source HP – Reg Effic

  • Added Close Ventilation Dampers during unoccupied hours option to Change Energy Parameters.
  • Added compressor energy breakout options for unitary equipment to allow for packaged energy rates to be entered without manual separation.
  • Added the LEED Summary report for use with LEED submission documents.
  • Added the LEED Settings dialog box to configure the LEED report.
  • Added numerous potential errors related to the ASHRAE 90.1 Appendix G/LEED Process to Scan for Errors.
  • Added the ability to model heat recovery VRF systems and two default VRF heat recovery plants.
  • Added the PRM Fan Details report to show calculated factors for determining fan power and power distribution among fans for Appendix G.
  • Added Supply Air Reset Temperature offset to the Component and Project Tree views.
  • Added several space types per ASHRAE 62.1-2010 for ventilation calculations.
  • Archived legacy VRF heat pump and VRF cooling only plants.
  • Moved Energy Source from the Controls section to the Cooling Equipment screen.
  • Moved Reject Condenser Heat from the Controls section to the Cooling Equipment screen.
  • Moved Reject Heat to Plant from the Controls section to the Cooling Equipment screen.
  • Removed options to view archived or T600-named library entries.
  • Removed the PFPVAV system in favor of the PFPVAVMBO system.
  • Increased the number of rooms that can be simulated with daylighting from 1000 to 3000.
  • Increased the number of significant digits on the Economic Parameters report.
  • Numerous updates for the Bidirectional Cascade flow scheme when modeling a central geothermal system.
  • Altered the Walls by Direction report to include unusual orientations in a more straight-forward manner.
  • Changed the default U-value for internal shading type Sample from 0.07 to 0.70.
  • Fixed an error that prevented combining files correctly when parenthesis are being used in the names of the spaces.
  • Fixed an error that incorrectly displayed the ventilation quantities when using a ducted, plenum or plenum/corridor vent deck.
  • Fixed an issue that prevented the GLHE temperature from surpassing the design condenser entering or going below the design minimum temperature.
  • Fixed an error that didn't properly show the fan power on the ECB/PRM Summary report when using custom fan curve units.
  • Fixed an error that prevented certain types of shading from operating in the southern hemisphere.
  • Fixed an error that prevented the Plants Entered Values reports from being displayed.
  • Fixed an error that incorrectly assigned ventilation load to main coils when using specific dedicated OA systems in the design simulation.
  • Fixed an error that prevented the design chilled water temperature from being copied from the library to the Controls screen.
  • Corrected an error that doubled the oversizing for individual equipment on the Equipment Energy Consumption report when Link Airside Coil Capacities was enabled.
  • Fixed the Room Entered Values reports to correctly shown when CO2 DCV sensors are being used.
  • Fixed the Systems Entered values reports to correctly show the Space Convective Gains to Occupied Layer.
  • Fixed an error where Chiller Tower Optimization was not properly used with respect to the chiller.
  • Fixed an error that incorrectly calculated cooling tower make-up water when using gpm or lps.
  • Fixed an error that increased the FL rate in heat recovery mode for a heat pump by 12.
  • Fixed the DHW condenser heat recovery system when using Reject Cond Heat = Domestic Hot Water.

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[Version 6.2.5] 3/22/2010

This update contains the following items:

  • Numerous calculation speed enhancements.
  • Added default closed-circuit cooling towers based upon ASHRAE 90.1-2007 equipment performance.
  • Removed variable volume fan Z-factor calculations from all variable volume fans.

  • Fan Curve 1 was changed to more closely approximate a forward curved fan.
  • Fan Curve 3 was changed to more closely approximate a forward curved with discharge dampers.
  • Fan Curve 9 was changed to more closely approximate the usage of a VFD
  • CZR-VFD set to be a standard library member.
  • Fan Curve 7 was archived.
  • Fan Curve 8 was archived.
  • Critical Zone Reset was archived.
  • EQ4280CZ was archived.
  • EQ4223CZ was archived.

  • BI fan w/inlet vn (Eq4204) curve changed from Fan Curve On/Off to Fan Curve 2.
  • AF Centrifugal var freq drv (Eq4280) curve changed to use the new Fan Curve 9.
  • BI Centrifugal var spd mtr (Eq4239) curve changed to use the new Fan Curve 9.
  • FC Centrifugal vav/inlet vn (Eq4203) set to be a standard library member.
  • FC w/VFD Crit Zn Reset (EQ4223CZR) set to be a standard library member.
  • AF w/VFD Crit Zn Reset (EQ4280CZR) set to be a standard library member.
  • Axial fan with VFD (EQ4202) set to be a standard library member.
  • AF w/IV Crit Zone Reset (Eq4201) was archived.
  • AF w/VFD Crit Zone Reset (Eq4280) was archived.
  • FC w/IV Crit Zone Reset (Eq4203) was archived.
  • FC w/VFD Crit Zone Reset (Eq4223) was archived.

  • Changed all critical zone reset fan curves to follow a cubic relationship.
  • Changed the unmet hours calculation so that only unmet hours in the zero degree rotation are used for the baseline alternative.
  • Changed the reporting of door areas in the Checksum reports to match that of window area reporting.
  • Added ability to model Trane's Bidirectional Cascade system.
  • Added ability to simulate a horizontal wellfield using IGSHPA calculations.
  • Added ability to simulate a vertical wellfield using an imported IDF file from a wellfield design program.
  • Added ability to simulate a custom wellfield by creating a custom Geothermal Schedule.
  • Added ability to create custom chilled water reset curves in the Curves Library.
  • Added ability to create custom condenser water reset curves in the Curves Library.
  • Added a Flow Scheme option to switch between traditional Fully Mixed ground loop calculations and Bidirectional Cascade.
  • Added new RTWD equipment for Bidirectional Cascade operations.
  • Added new thermal storage types to simulate various ground loop heat exchangers.
  • Added the ability to use ASHRAE 90.1-2007 PRM fan power calculations with associated pressure credits.
  • Added the ability to enable ASHRAE 90.1-2007 PRM calculations and disable building rotation for analysis purposes.
  • Added units of watts per gpm for chilled water and condenser water pump types.
  • Added two additional output reports for geothermal systems: Geothermal Summary and Geothermal Plant Load Summary.
  • Added additional fields to the TRACE Visualizer (Graph Profiles and Energy) for cogeneration and geothermal selections.
  • Added the ability to specify the file location for an imported weather file in the Weather Library.
  • Added functionality that will create templates based upon the Space Type Name when importing gbXML.
  • Disabled direct dehumidification during unoccupied hours.
  • Fixed an error that would eliminate baseline fan power when unconditioned spaces were assigned to a baseline system.
  • Fixed an error that would not display some energy usage when a heat pump airside system was used on the Equipment Energy Consumption report.
  • Fixed an error that prevented load shedding economizers to work properly.
  • Fixed an error that would not account for negative base utilities on the ECB report.
  • Fixed an error that would hide the heating ventilation quantity for some systems on the Room Checksums report.
  • Fixed an error that would account for adjacent floor loads twice when using multiple adjacent floors.
  • Fixed an error that incorrectly displayed the heating sensible coil load on the Peak Load reports.
  • Fixed an error that created large amounts of over/undersizing when using ASHRAE Standard 62.1 and Room Direct ventilation decks.
  • Fixed an error that incorrectly reported room ventilation quantities when using SFPVAV and ASHRAE Standard 62.1.
  • Fixed an error that incorrectly calculated the PFPVAV system exhaust quantity during heating design.
  • Fixed an error that would oversize boilers when absorption chillers were used in conjunction with cogeneration equipment.
  • Fixed an error that would prevent energy values to be calculated when the calendar definitions contained fewer than five daytypes.
  • Fixed a skylight load error that would incorrectly read legacy values and not report the correct skylight loads.
  • Fixed two errors that would ignore the capacity of a humidification coil during the system simulation.
  • Fixed an error that incorrectly ratioed reduced year weather when derived from full year weather.
  • Fixed an error that would ignore the Ez value in ASHRAE 62.1 calculations when Vot was less than Vou.
  • Fixed an error in the Economic Summary report that would not display fuel sources other than electric in the graphs.
  • Fixed an error that prevented custom doors from being exported and imported via EXP files.
  • Fixed an error that would hide the reheat coil when using the PFPVAVMBO system type.

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[Version 6.2.4] 10/23/2009

This update contains the following items:

  • Added "% of Design Capacity by adjusting airflow" as an option on the Coils tab of Create Systems.
  • Added "% of Design Capacity by allowing subcool" as an option on the Coils tab of Create Systems.
  • Added the ability to export basic Load Design data to HVAC Solutions software.
  • Added license activation to software installation.
  • Changed "% of Design Capacity Cooling Capacity" to only adjust the latent coil capacity and not airflows.
  • Changed the default Main cooling coil capacity units to be "% of Design Capacity by adjusting airflow" for new projects.
  • Changed the default Main cooling coil capacity units to be "% of Design Capacity by adjusting airflow" for legacy projects.
  • Changed the Report Viewer scrolling progress bar to display in the background.
  • Updated the Equipment Energy Consumption report to show heating energy usage for a heatpump cooling plant.
  • Updated several system images with additional labeling.
  • Updated the Economic Summary report to include more graphs but similar economic information.
  • Fixed several errors displaying economic values with large files.
  • Fixed an error displaying equipment energy consumption with SI units on the Equipment Energy Consumption report.
  • Fixed a demand limiting error.
  • Fixed an error that would not use direct dehumidification weather correctly.
  • Fixed an error that would display the wrong airflow on the Checksum reports with shut-off VAV boxes and SFPVAV systems.
  • Fixed an error that prevented hot gas reheat for dehumidification from working properly with dedicated outside air systems.
  • Fixed an error that incorrectly calculated Voz when ASHRAE 62.1 was being used for system level ventilation calculations.
  • Fixed an error that incorrectly calculated auxiliary heating coil conduction loads with systems that contain underfloor plenums.
  • Fixed an error that would double-account adjacent floor loads during the System Simulation.

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[Version 6.2.3] 9/2/2009

This update contains the following items:

  • Fixed an error that prevented full year weather files to be imported into Windows Vista in certain circumstances.
  • Fixed an issue that would crash TRACE on the Walls tab of Create Rooms.
  • Fixed a crash that would occur when using the Heating Building Envelope Loads at time of space peak.
  • Adjusted the deck locations for certain configurations of the Type III Isotherm Wheel.
  • Fixed an error with Available 100% as the optimum start schedule during specific levels of occupancy.
  • Fixed an error that would prevent the Design Cooling Capacities report from being displayed.
  • Fixed an error that would incorrectly display fan power when heating-only systems were used in conjunction with PRM calculations.
  • Fixed an error preventing the importing of .lds and older TRACE archive files.

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[Version 6.2.2] 7/31/2009

This update contains the following items:

  • Added the ability to use Available 100% as an optimum start schedule.
  • Added additional information to the Building Temperature Profiles report which displays when unmet load hours occur.
  • Added two additional biquadratic VRF models based upon variable speed compressors and variable flow refrigerant (digital scroll).
  • Added additional common errors to be checked when using Scan for Errors including incorrect usage of thermostat schedules.
  • Added two additional air-cooled scroll chillers.
  • Added the ability to directly import glass from LBNL Window 5.
  • Added the ability to import multiple pieces of equipment simultaneously from TOPSS.
  • Enabled the template recovery function so each project (.trc) file that is opened is scanned for template problems and fixed.
  • Fixed an error that incorrectly calculated time lag based upon thermal mass between 180 and 185 lb/sf when using the TETD method.
  • Fixed an error that did not reduce the economizer control point by the underfloor heat pickup with UFAD and DV systems.
  • Fixed an error that did not reduce the economizer control point by the extra coil leaving drybulb during indirect dehumidification.
  • Fixed an error for DDVAV where heating return airflow was incorrectly calculated when the block airflow is entered.
  • Fixed an error that displays energy usage for an alternative when that alternative's Energy Simulation was not calculated.
  • Fixed an error which allows for more combined area when using openings than the total wall area.
  • Fixed an error that incorrectly calculates daylighting when a room has an exposed floor and dimensional glass geometry.
  • Increased the total limit of chilled beams in a single room from 500 to 5000.
  • Fixed an error that would crash TRACE when a new alternative is created and the rooms are using a previous alternative.
  • Fixed an error that would incorrectly display component energy usage in the Visualizer.
  • Fixed an error that incorrectly reports ventilation quantity incorrectly with DV systems.
  • Fixed an error which incorrectly calculates the upper stratified layer temperature with DV systems and ducted returns.
  • Fixed an error that incorrectly reported auxiliary fan heat on the Airflow Heat Gain and Loss at Coil Peak report.
  • Fixed an error that would remove equipment energy usage when demand limiting was used.
  • Fixed an error that would prevent TRACE Load (.lds) files from being imported into TRACE or Load Design.
  • Fixed an error that ignored the Reset and Lockout definitions for lighting schedules.
  • Fixed an error that incorrectly calculates the return air temperature for DV/UFAD systems when a plenum return is used.
  • Updated Hot Gas Reheat for Dehumidification to be used with optional ventilation coils.
  • Fixed an error that incorrectly applied direct dehumidification with parallel supply air tempering for ACHBEAM.
  • Fixed an error that would undersize the main cooling coil design airflow with ACHBEAM.
  • Fixed an error that incorrectly reported unmet load hours with ACHBEAM.
  • Corrected the optimum start usage for SZ and VTCV systems.
  • Fixed an error that incorrectly assigned all coil capacity to the first piece of equipment when airside coils are linked to plant capacities.
  • Corrected three infiltration Heating Design definitions (Infil - Low rise office, Infil - High rise office, and Infil - Retail grocery store).
  • Fixed several Plant Wizard templates to correctly assign capacity percentages to individual equipment.

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[Version 6.2.1] 3/31/2009

This update contains the following items:

  • Added displacement ventilation airside systems.
  • Added active and passive chilled beam airside systems.
  • Added the ability to model multiple/different openings per wall including doors.
  • Added the ability to create custom door types in the Glass Library.
  • Added the ability to define rooms as conditioned or unconditioned.
  • Added additional common mistakes to check for in Scan for Errors.
  • Updated the default ASHRAE 90.1-2004 library to fix a hot water reset curve error and a PTAC energy rate error.
  • Updated the System Temperature and Humidity Profile reports to show occupied and all hours.
  • Changed the underfloor plenum location from system to zone-level.
  • Changed the default value for Space Sensible Gains to Occupied Layer from 50% to 60% for Ducted Through Underfloor Plenum and Supply Via Sidewall Displacement Ventilation options for Supply Duct/Air Path Location.
  • Changed the order of equipment displayed on the Equipment Energy Consumption report.
  • Fixed an error that incorrectly converted Height Above Ground when switching from IP to SI units.
  • Fixed an error that would remove the humidification coil when a main heating coil for the airside system (e.g. VAVBSK) did not exist.
  • Fixed an error that would prevent full year weather from being imported correctly.
  • Fixed an error that prevented the Entered Values reports from being viewed.
  • Fixed an error that prevented glass types from being imported into the Glass Library.
  • Fixed an error that eliminated the Default Air Cooled Condenser when using plant level heat rejection.
  • Fixed an error that would incorrectly calculate the coil capacity when using floor multipliers and specifying the coil capacity.
  • Fixed an error that would incorrectly calculate the stratification temperatures when adjacent ceiling plenums are used.
  • Fixed an error that would prevent the system profile from being edited in Chiller Plant Analyzer.
  • Fixed an error that would incorrectly show gas consumption on the Energy Cost Budget report for equipment with no gas consumption when Base Alternative For Energy Cost Budget Method has been selected.
  • Fixed an error that would prevent the ASHRAE weather overrides from being saved in an archive file with imported weather.

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[Version 6.2] 12/10/2008

This update contains the following items:

  • Added active and passive chilled beam systems.
  • Added constant and variable volume displacement ventilation systems.
  • Added constant and variable volume underfloor air distribution systems.
  • Added hot gas reheat for dehumidification.
  • Added ASHRAE weather from 2005 Handbook of Fundamentals.
  • Added water consumption algorithm for cooling tower to calculate water usage.
  • Added Scan for Errors feature which scans for common input errors or missing library information.
  • Added ability to input supply air leakage up- and down-stream of coil based upon system type.
  • Added ability to input biquadratic unloading curves for cooling plants.
  • Added ability to model hot water reset and condensing boilers as a function of OADB.
  • Added ability to import several chiller selections from TOPSS.
  • Added a glossary of common terms to the help file.
  • Added the ability to use reset and lockout tables for lights and miscellaneous utilization schedules.
  • Added an ASHRAE Standard 62.1-2004 output report to the Design Reports.
  • Changed the PFPVAV system to use PFPVAVMBO calculations.
  • Updated TRACE User's Manual with more topics including topics that discuss the new airside systems.
  • Updated system graphics.
  • Updated system graphics for the Plant Wizard and Chiller Plant Analyzer.
  • Fixed the demand defrost curves for air-to-air heat pumps to allow for proper defrost usage.
  • Fixed an issue when the exhaust fan kW would be incorrectly calculated based upon entered static pressure.
  • Fixed an issue that would not allow a preheat coil to operate with a VRH system during unoccupied hours.
  • Fixed an error that would omit the Summer Ground Reflectance when changed by a user.
  • Fixed an error that would ignore discriminator controls for some systems.
  • Fixed an error that would ignore internal shading for windows that were defined with spectral glass.
  • Fixed an error with the fan coil system that would reset room SADB based upon system-level SABD.
  • Fixed an error that would incorrectly assign the CO2 sensor location in templates based upon previous alternatives.
  • Fixed an issue with DDVAV that would incorrectly set the cold deck return outside-air CFM.
  • Fixed an issue that would eliminate chiller energy usage with heat recovery machines and tank charging.
  • Fixed an error that would double the multiplier used to link plant and coil capacities.
  • Fixed an error that would ignore a split dehumidification system with a single zone airside system.
  • Fixed an error that would ignore the use of energy recovery with the radiation heating-only system.
  • Fixed an error that displayed the incorrect units for a humidification coil on various Design reports.

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Trane, in offering the Trane Air Conditioning Economics (TRACE™ 700) computer program, accepts no responsibility or liability for the design of buildings or their support systems or for the accuracy of the economic analysis and the building and system air conditioning load data. The economic analysis and the building and system air conditioning load data are based on conventional economic and engineering principles, plus financial and engineering data supplied only by the program user. This TRACE 700 program is intended to be used as a comparative study of operating efficiencies and costs of alternative air conditioning systems. Trane further accepts no responsibility or liability for the suitability of the building air conditioning system in providing proper temperature control, humidity control, infiltration, air distribution and quiet operation.


[Version 6.3.2] 9/11/2015


To install and run the program you will need: a Pentium® 4 or higher processor, Microsoft Windows® 7/8 operating system, at least 1 gigabyte (GB) of RAM,  and 500 MB of free hard-disk space (750 if Microsoft .NET Framework version 2.0 is not already installed).