Ammonia-Water Low-Temperature Thermal Storage System

[+] Author and Article Information
J. J. Rizza

Mechanical Engineering Department, California State University, Fullerton, Fullerton, CA 92634

J. Sol. Energy Eng 120(1), 25-31 (Feb 01, 1998) (7 pages) doi:10.1115/1.2888042 History: Received September 01, 1994; Revised October 01, 1996; Online February 14, 2008


An analysis of a low-temperature thermal storage system using an ammonia-water solution both as a refrigerant and as a low-temperature thermal storage material is considered. The thermal storage is useable at a temperature of −27°C and higher. The proposed system is designed to shift electric demand from high to low-demand periods. The system utilizes a heat-operated absorption refrigeration system; however, the generator heat is supplied by a self-contained vapor compression heat pump. The heat pump is operated during the off-peak period to recover the low-temperature thermal storage by reprocessing the stored ammonia-water solution to a lower ammonia-water concentration. The ammonia vapor liberated from solution in the dephlegmator is used in the compressor to produce the generator heat. Three different configurations are considered, including a solar-assisted system. The results are compared to an eutectic salt storage system.

Copyright © 1998 by The American Society of Mechanical Engineers
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