A thermodynamic model of compressed humid air within an underground rock cavern for compressed air energy storage

doi:10.19799/j.cnki.2095-4239.2020.0380

Abstract

Abstract:

For understanding the variation process of humidity in an underground cavern for compressed air storage and its influence on the thermodynamic processes of compressed air, the heat transfer mechanisms of vapor phase change were analyzed. A thermodynamic model for compressed air taking the humidity of air into account was suggested and validated. The influence of humidity variation on the temperature and pressure of compressed air and condensation and evaporation effects in the cavern were analyzed. The results show that vapor quantity included in inflowing compressed air has a significant influence on temperature variation but only a slight influence on pressure variation of the compressed air in the cavern. During compressed air discharge, relative humidity in the cavern rises gradually and could go up to 100%, and condensation happens. During air charging, relative humidity in the cavern decreases gradually, and evaporation occurs. The quantity of condensed water is far greater than that of evaporated water. The problem of water treatment after the cavern experienced a long-term operation should be considered in engineering designs.

Key words: compressed air energy storage, underground rock cavern, compressed humid air, thermodynamic process, condensation water

CLC Number:

TK 123

Zhongming JIANG, Jing GUO, Dong TANG. A thermodynamic model of compressed humid air within an underground rock cavern for compressed air energy storage[J]. Energy Storage Science and Technology, 2021, 10(2): 638-646.

Figures/Tables 2

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