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Utility
Plant Expansion and Thermal Energy Storage System Addition
California State University
San Marcos, CA
UTILITY
PLANT EXPANSION:
LSW Engineers acted as the prime consultant for this project that added 1,200
tons of variable speed chiller and cooling tower capacity and a 400
horsepower hot water boiler in a 2,000 SF expansion of the existing two-level
utility plant. The project included extending the existing chilled water and
heating water mains through the existing tunnel structure to serve future
buildings. The 12 kV electrical power distribution system
was extended through existing manholes and duct banks. The cooling tower
addition is a stainless steel unit with PVC fill and its capacity is
controlled with a variable frequency drive.
 THERMAL ENERGY
STORAGE:
A 2-million-gallon, 16,000 ton-hour aboveground thermal energy storage (TES)
tank was originally in the project scope. At the start of design, we
determined that the tank and plant expansion could not be constructed with
the funds allocated to the project. To quantify the cost impact of deferring
TES construction, life cycle costs were analyzed for a number of TES and
non-TES alternatives. In anticipation of electrical rate changes that may
result from restructuring, a sensitivity analysis was performed with both
marginally higher and lower rates. The resulting design provides a larger
chiller, more in keeping with the campus' master
planned capacity requirements. The TES was subsequently designed by LSW and
is now completed.
Owner: University of California, San Marcos
Size: 2,000 SF (expansion project); 1,200-ton chiller addition; 400 HP
hot water boiler; and 16,000-ton/hr
Thermal Storage System.
Estimated Construction Cost: $4,500,000
Completion Date: 2001
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