April, 2015


The University of Texas maintains many laboratories that enhance its ability to perform cutting edge research. One such set of labs is the Thermal Façade Lab at the Center for Sustainable Development.
The Thermal Façade Lab permits the comparison between components, systems, and controls used in buildings. One thermal lab acts as the control, and one as the experimental platform. The differences in energy use can be calculated and the benefits of each system compared. This permits comparisons regardless of the day-to-day weather conditions.
The lab has recently been updated with a second thermal lab. A new HVAC system is required that is designed to support both labs. This purpose of this project is to design the new HVAC system. This will enable the CSD to perform cutting-edge research into building energy use and conservation.
The two thermal lab units will utilize a single shared water chiller unit, coupled with individual but identical fan coil and duct/distribution systems in each lab. A thermal store to assist in leveling daily energy demands is planned for a later date, but will not be included in the initial plan. heating will be provided by a resistive electric heating element. Conditioned air will be distributed via ducts to linear slot ceiling diffusers
located over the south-facing windows.
The system will be designed to support the maximum load generated by both internal and
external sources. Internal loads will include ~ 300 watts of electrical loads and continual
occupancy by two researchers.


The project deliverables are:
♦ Maximum cooling and heating load values for the building and coil
♦ Psychrometric charts showing operational characteristics at maximum loads
♦ A schematic of the proposed system
♦ A duct plan, including pressure drops and component specifications
♦ Fan specifications (actual fan to be selected later)
♦ Heater coil specification sufficient to meet maximum heating loads
♦ Cooler coil specifications sufficient to meet maximum cooling loads
♦ Chiller unit specifications sufficient to meet the cooling loads of both labs
♦ Chilled water piping specifications

No control system is included; this will be designed in a subsequent project.

HVAC System Design Specifications for the Thermal Facade Lab cover

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