Temperature Regulation Model and Experimental Study of Compressed Air Energy Storage Cavern Heat Exchange System

Peng Li, Zongguang Chen, Xuezhi Zhou, Haisheng Chen and Zhi Wang
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Peng Li: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Zongguang Chen: Zhongnan Engineering Corporation Limited of Power China, Changsha 410014, China
Xuezhi Zhou: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Haisheng Chen: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Zhi Wang: School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China

Sustainability, 2022, vol. 14, issue 11, 1-16

Abstract: The first hard rock shallow-lined underground CAES cavern in China has been excavated to conduct a thermodynamic process and heat exchange system for practice. The thermodynamic equations for the solid and air region are compiled into the fluent two-dimensional axisymmetric model through user-defined functions. The temperature regulation model and experimental study results show that the charging time determines the air temperature and fluctuates dramatically under different charging flow rates. The average air temperature increases with increasing charging flow and decreasing charging time, fluctuating between 62.5 °C and −40.4 °C during the charging and discharging processes. The temperature would reach above 40 °C within the first 40 min of the initial pressurization stage, and the humidity decreases rapidly within a short time. The use of the heat exchange system can effectively control the cavern temperature within a small range (20–40 °C). The temperature rises and regularly falls with the control system’s switch. An inverse relationship between the temperature and humidity and water vapor can be seen in the first hour of the initial discharging. The maximum noise is 92 and 87 decibels in the deflation process.

Keywords: compressed air energy storage; heat exchange system; thermodynamic response; high pressure; charging process; temperature regulation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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