High-Temperature Heat Pump Using CO 2 -Based Mixture for Simultaneous Heat and Cold Energy Reservation

Chengyu Li, Yongzhen Wang (), Qiang Guo, Youtang Wang () and Hu Chen
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Chengyu Li: School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255000, China
Yongzhen Wang: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100083, China
Qiang Guo: Hisense Group Holding Co., Ltd., Qingdao 266100, China
Youtang Wang: School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255000, China
Hu Chen: Shandong Qihao New Energy Technology Co., Ltd., Zibo 255400, China

Energies, 2023, vol. 16, issue 18, 1-18

Abstract: To leverage temperature glide in evaporation, a transcritcal heat pump using a CO 2 -based mixture is investigated from a perspective of simultaneous heat and cold energy storage. Coefficient of performance for heating (COP h ) and exergy efficiency are used to evaluate system performance. A parametric investigation on the heat pump is conducted, and the coupling behavior of the cycle with thermal energy storage (TES) material is investigated in view of stored exergy of TES. Optimization and comparative studies are carried out among various mixtures. The results reveal that maximum cycle temperature is mainly affected by high pressure and superheating degree, while minimum cycle temperature, as well as cold exergy, is highly dependent on evaporating temperature glide, with little influence from high pressure. The total exergy efficiency can reach up to 60%. The temperature of low temperature TES could reach as low as −32.4 °C for CO 2 /R601, providing the largest proportion of cold exergy to total exergy, up to 30.1%.

Keywords: CO 2 -based mixture; cold exergy; heat pump; thermal energy 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: 2023
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