This paper presents an analysis of a cold thermal energy storage (TES) system operating in series with an R-123 chiller. A lithium bromide/water solution is used both as a refrigerant and as a cold thermal storage material. The refrigerant, liquid water, is extracted from the strong solution during the off-peak period. The liquid water and weak solution, a byproduct of the refrigerant recovery process, are used during the on-peak period to cool the building. Building waste heat is pumped by the R-123 compressor to a higher temperature during the off-peak period and is used in the generator to recover the thermal storage by reprocessing the stored solution to a higher lithium bromide concentration. The storage volumetric efficiency and system COP are determined and compared to storage systems based on water/ice and liquid water. The storage volumetric efficiency is greater than a water/ice system and far exceeds the value for a liquid water system. The proposed system, which uses an external heat pump as a source of generator heat, is also compared to another system that uses a self-contained internal heat pump (the compressor operates independently from the chiller and uses the liberated water refrigerant as its working fluid). The system presented here outperforms both the water/ice system and the internal heat pump system but is unable to match the liquid water system COP. However, it has other well-defined advantages over the liquid water system and appears to be a competitive alternative to conventional TES systems.
Aqueous Lithium Bromide TES and R-123 Chiller in Series
Contributed by the Solar Energy Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, August 2001; final revision, June 2002. Associate Editor: M. Olszewski.
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Rizza, J. J. (January 27, 2003). "Aqueous Lithium Bromide TES and R-123 Chiller in Series ." ASME. J. Sol. Energy Eng. February 2003; 125(1): 49–54. https://doi.org/10.1115/1.1530630
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