James P. Valiensi, P.E., C.E.M.
Gary Gidcumb, LEED AP
Energy Division Manager
DN Tanks, Inc.
Senior Mechanical Engineer
Construction Project Manager
Mt. San Antonio College
Chilled water Thermal Energy Storage (TES) tanks have served owners with district cooling systems for over 35 years as a reliable technology that can significantly reduce the electric power demand during peak periods. These TES systems act as large virtual batteries, storing power in the form of chilled water. The daily charging and discharging of a TES tank provide owners and operators with the flexibility to consume energy for cooling when it is most economical, while reducing the net energy consumption for chilling the water. This presentation will highlight unique application of 2.0 million gallon chilled water TES tank that was recently integrated into the campus-wide cooling system at Mt. San Antonio College in Walnut, CA. This is unique TES application because the chilled water tank is fully buried under the student parking lot. The presentation will include the perspectives of the project from the viewpoint of the Owner, Engineer, and Tank Builder. From the Owner’s perspective: 1) The economic benefits of this TES tank application. 2) The potential funding sources for TES projects. 3) The project development challenges, and decision making process that led to a fully buried TES tank. From the Engineer’s perspective: 1) Integrating a TES tank within a new and existing chilled water cooling system. 2) Hydraulic considerations when adding a large TES tank into the system. 3) Design challenges during the project development phase. From the Tank Builder’s perspective: 1) Considerations when fully burying a tank. 2) TES tank design features. 3) Construction challenges during the installation phase. And finally, a short overview of the TES tank performance will be reviewed with actual data during the operation of the system. Participants will gain a general understanding of Thermal Energy Storage, how it might apply to projects in CA, and the financial and engineering considerations for these projects.
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