The Kings County Courthouse in Hanford, California, has achieved LEED Silver Certification and realized more than $100,000 in annual energy savings thanks to a thermal energy storage system.
Working with integrated design firm, DLH Group, Kings County took a centralized integrated design approach for the project with chiller plant design, daylighting harvesting, bioswales, building orientation, centralization and transportation all playing an important part.
Thermal Energy Storage
To create an optimal chiller plant design, the engineering consultants engaged Trane to help evaluate mechanical system options based on their energy use and a full comparative life-cycle cost analysis. A smaller cooling load, due to the south facing orientation of the building, allowed for a reduced sized chiller plant.
Thermal energy storage (TES) was considered to shift load from daytime hours, when energy costs are higher, to less expensive nighttime hours. To take advantage of this energy price differential, the design team evaluated the option of employing a chiller plant with ice-based thermal energy storage to create cooling and store it for daytime consumption. The decision was made to move forward with a chiller plant design incorporating a combination of energy-efficient Trane water-cooled Series R helical rotary chillers and a CALMAC® thermal storage system to enable load shifting and provide energy cost savings.
The design team was able to successfully reduce costs to meet budget without impacting the design schedule. The thermal energy storage system enabled the courthouse to enroll in utility incentives for energy performance and permanent load-shifting, saving 26% in energy costs or more than $100,000 annually. The redesigned Kings County Courthouse also met the county’s objective to achieve LEED Silver certification.
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