Texas State Technical College


Texas State Technical College (TSTC) is an independent state system comprised of four separately-accredited two-year, state-supported technical colleges. TSTC’s mission is to efficiently and effectively help Texas meet the high-tech challenges of today’s global economy. Nearly 30,000 students are served each year through traditional degree programs, short-term continuing education and corporate training programs.


With aging infrastructure and mechanical systems, humidity control was becoming an issue in many classrooms at Texas State Technical College. A continued cycle of deferring maintenance and system upgrades led to inferior system performance and inefficient energy use. In addition, expansion plans in process would require increased mechanical capacity to accommodate the school’s growth. With a strong commitment to providing exceptional value for its students, TSTC wished to upgrade its systems, keeping the campus functional while construction was in progress and creating as little disruption as possible to daily operations.


TSTC entered into a design build agreement with Trane, a long-time trusted supplier, for its system upgrade. With an active campus and strict timing, Trane took on the risk of running the engineering/design phase of the project parallel to the construction/action phase, knowing there was no room for error, stalled issues or miscommunication. With a Trane contracting project manager leading the charge, the Trane team worked with engineering and mechanical contractors, all marching lock step to the same beat. Challenges were waiting around every corner, but through constant communication, they were quickly overcome. Communications included weekly owner meetings to review project status.

Phase 1: Design build
A new chiller plant was designed and constructed with capacity of 600 tons and total future capacity of 2,000 tons. The existing packaged rooftop units and air-cooled chillers at three campus buildings were replaced with Trane EarthWise™ CenTraVac™ centrifugal water-cooled liquid chiller systems. The air distribution was modified to a variable air volume (VAV) system. Trane’s unique approach to the central plant system enables the use of low temperature chilled water and variable flow chilled water delivery systems, as well as low temperature air and system pressure optimization technologies. The solution not only meets the college’s chilled water requirements, but also allows ancillary equipment, piping, and ductwork to be sized smaller, lowering project first costs and energy consumption.

Phase 2: ARRA funded project
TSTC applied for and received ARRA (American Recovery and Reinvestment Act) funds to complete the second phase of the project, which consisted of expanding the existing chiller capacity with an additional 600-ton chiller and associated infrastructure, and replacing DX systems at seven buildings with chilled water systems with VAV air distribution. To meet the ARRA requirement that 10 percent of the project be renewable energy, a 100 kW solar PV system and a new roof were installed on one of the classroom buildings.

Increasing energy savings
Lighting was upgraded at thirty-three college buildings, converting T12 lights to high efficiency T8 lamps and ballasts. The existing Trane Tracer Summit® building automation system (BAS), controlling HVAC at fourteen campus buildings, was upgraded to include the new systems. Programming modifications allowed the design concepts to be implemented and the new VariTrane® VAV terminal units, Trane Performance Climate Changer air handlers and the chillers to communicate with the existing BAS. Trane as the single source for both equipment and controls provides seamless system communication.


The simultaneous design/construction upgrade at 500

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