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Project Info COMPLETE Project Title

Refrigerant-Based Energy Storage System

Project Number DR 05.12 Organization SCE End-use Other Sector Other Project Year(s) 2005 - 2006
Description

Project Summary

This project demonstrated the functionality of a refrigerant based energy storage (RBES) for air conditioning (A/C) system under different cooling load conditions. The RBES A/C system is designed to shift on-peak A/C demand to non-peak periods. It applies to buildings with a cooling capacity of up to 7.5 tons. The system can operate under two main configurations; stand-alone or hybrid. In the stand alone configuration, the system basically functions as a classical thermal energy storage (TES) system. It simply shifts a large portion of on-peak demand to mid- and off-peak periods. Under the hybrid configuration, the RBES A/C system is an add-on to the existing conventional A/C system of the building. The hybrid set up can be leveraged to address demand curtailment in response to an advance signal. Five RBES A/C systems were installed at three Southern California Edison sites. The findings from this project, under winter conditions indicate these units can mitigate the A/C electric demand by 6 kW in small commercial applications with 5 tons of cooling load.

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The ETCC is funded in part by ratepayer dollars and the California IOU Emerging Technologies Program, the IOU Codes & Standards Planning & Coordination Subprograms, and the Demand Response Emerging Technologies (DRET) Collaborative programs under the auspices of the California Public Utilities Commission. The municipal portion of this program is funded and administered by Sacramento Municipal Utility District and Los Angeles Department of Water and Power.