Study on Heat Storage Performance of Phase Change Reservoir in Underground Protection Engineering

Hongyu Zhang, Fei Gan, Guangqin Huang, Chunlong Zhuang, Xiaodong Shen, Shengbo Li (), Lei Cheng, Shanshan Hou, Ningge Xu and Zhenqun Sang
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Hongyu Zhang: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Fei Gan: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Guangqin Huang: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Chunlong Zhuang: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Xiaodong Shen: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Shengbo Li: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Lei Cheng: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Shanshan Hou: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Ningge Xu: Department of Military Installation, Army Logistics Academy of PLA, Chongqing 401331, China
Zhenqun Sang: School of Communication Sergeant, Army Engineering University of PLA, Chongqing 400035, China

Energies, 2022, vol. 15, issue 15, 1-31

Abstract: In view of the main problems of the condensing heat discharge modes of the existing underground air-conditioning system, the technical scheme of using phase change heat storage modules to improve the heat storage capacity of the reservoir is proposed. By establishing a 3D flow and transient heat transfer model of the phase change reservoir, the effects of thermal property parameters, package size and arrangement of the phase change heat storage modules on the heat storage performance of the phase change reservoir were quantitatively analyzed based on three indexes: heat storage capacity per volume Δ q , guaranteed efficiency coefficient η and slope of temperature rise per unit load ε . The results show that when the phase change temperature is 29 °C (23 °C increased to 33 °C) and the latent heat value is 250 kJ/kg (100 kJ/kg increased to 250 kJ/kg), Δ q (110.92 MJ/m 3 , 112.83 MJ/m 3 ) and η (1.22, 1.24) under both conditions are at their most, respectively, indicating that the phase change temperature should be less than 4 °C at the outlet temperature of the reservoir, and phase change materials with a high latent heat should be selected in engineering design whenever possible. When the size of the phase change module is 150 mm × 20 mm and the phase change reservoir adopts four intakes, ε (0.259, 0.244) under both conditions is the smallest, indicating that increasing the area of the phase change heat storage module and the fluid and increasing the inlet disturbance of the reservoir can enhance its heat storage capacity.

Keywords: underground protection engineering; air-conditioning reservoir; phase change material; phase change heat storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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