An Experimental Study on the Energy Use during a TES-Based Reverse Cycle Defrosting Method for Cascade Air Source Heat Pumps
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Adopting cascade air source heat pumps (CASHPs) is a possible way to widespread application of air source heat pumps in cold area. When CASHPs are operated in winter, frosting/defrosting may become problematic. Thermal energy storage-based reverse cycle defrosting (TES-based RCD) method for CASHPs has been developed to provide heat to defrosting and continuously heat indoor space. In this paper, the energy use during the TES-based RCD for CASHPs was experimentally studied. It was found that most of the heat supplied was dissipating to the ambient air, accounting for 44.3%, and the defrosting efficiency was 30.2%. Meanwhile, most of the heat came from the TES-heat exchanger (TES-HE), accounting for 40%. This study can be utilized to guide the design optimization for the TES-HE and promote energy-saving for TES-based RCD method.
KeywordsDefrosting Energy use Thermal energy storage Cascade air source heat pump
Funding for this research was supported by The National Natural Science Foundation of China (Project No.: 51406119).