Thermally-pressurized sorption heat storage cycle with low charging temperature

Abel Mehari, Z.Y. Xu and R.Z. Wang

Energy, 2019, vol. 189, issue C

Abstract: Sorption heat storage is attractive to store solar energy for short-term cooling/heating and long-term heating. The three-phase sorption heat storage is advantageous in energy storage density, but the charging temperature to reach the crystallization is high. In order to eliminate the high charging temperature requirement for the three-phase sorption heat storage, a thermally pressurized three-phase heat storage cycle is proposed in this paper. In this cycle, the desorbed vapor from heat storage is first pressurized by the thermally driven compression sub-cycle and then condensed by the ambient. In this way, the heat storage pressure of the proposed cycle will be lower than the conventional cycle, thus decreasing the charging temperature. Performance of the proposed cycle is analyzed with working pairs of LiCl/H2O and LiBr/H2O. For cold storage in summer and heat storage in winter, the proposed cycle obtains storage densities of 1244 Wh/kg and 1252 Wh/kg at the charging temperatures of 75 °C and 55 °C respectively. Compared with the conventional heat storage cycle with LiCl/H2O, the storage densities are enhanced by 2.5 and 5.9 times accordingly due to the crystallization reached under low driving temperature. This makes the proposed cycle suitable to store solar heat with non-concentrating collectors.

Keywords: Thermal storage; Solar collectors; Crystallization; Sorption; LiCl/H2O; LiBr/H2O (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:189:y:2019:i:c:s0360544219319991

DOI: 10.1016/j.energy.2019.116304

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