Option to attend all three of the below listed Alaska Education Month Sessions
Single Zone VAV Systems - April 2nd
Recent changes to ASHRAE Standard 90.1 require either two-speed or variable-speed fan control in many single-zone systems. This ENL will review these new requirements, discuss the potential benefits of single-zone VAV systems (lower energy use, better part-load dehumidification, and less fan-generated noise at reduced fan speeds), identify common applications for this system, and discuss ways to address some of the application-related challenges (air distribution, ventilation, and building pressure control). In addition, representatives from a large, national retailer will share their experiences with replacing older, constant-volume rooftop equipment with new single-zone VAV units in their stores.
Presenters: Trane applications engineers John Murphy and Eric Sturm.
After attending you will be able to:
¦ Summarize the potential benefits of a single-zone VAV system
¦ Identify recent changes to ASHRAE Standard 90.1 that require either two-speed or variable-speed fan control in many single-zone systems
¦ Summarize some common challenges of applying a single-zone VAV system
¦ Apply design and control strategies to address these challenges
Fans in Air-Handling Systems April 9
Fans used in air-handling systems often have a significant impact on energy use and acoustics. How much of an impact depends on how a fan is selected, installed, and operated.
Join Dennis Stanke, Dustin Meredith, John Murphy and Dave Guckelberger as they discuss fan performance curves and fan laws, different fan types (housed vs. plenum fans, direct-drive plenum fans, fan arrays), how a fan interacts with various types of systems, considerations when selecting a fan (efficiency, acoustics, footprint), and ASHRAE 90.1 fan power limitations.
¦ How to select, install, and operate fans to avoid problems related to inadequate airflow or excessive noise
¦ When to select the different fan types (housed vs. plenum, belt-drive vs. direct-drive, single fan vs. a fan array)
¦ How to design fan systems to meet the prescriptive requirements of ASHRAE Standard 90.1-2007
VSD's - Effect on System Components
Variable-speed drives (VSDs) can save energy, but the savings may not equal “the cube of the speed” in every case. This ENL looks at how VSDs affect the performance of pumps, cooling-tower fans, air-handler fans, and chillers, and discusses the differences in VSD control in each of these applications.
¦ Identify how adding a VSD to one component affects other components in the system and understand that it’s important to make building owners aware of these interactions
¦ Summarize why energy savings from VSDs vary by application and may not correspond to the “cube of the speed”.
¦ Summarize how other equipment in the system is affected when a VSD is added (to a condenser water pump, for example)
¦ Apply control methods that can enhance the benefits of a VSD.