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An experimental study of defrosting energy of an R744 automobile air-source heat pump system with different defrost-initiation criteria.

Number: 2150

Author(s) : ZHANG W., HRNJAK P.

Summary

This paper analyzes the energy supplied for defrosting and its consumption. Data are obtained in experiments using a transcritical R744 heat pump system in the outdoor condition of 0℃ and 90% RH. Defrosting was conducted by reversing the flow to warm the outdoor coil and melt the accumulated frost. The effects of the criterion for initiation of defrosting on the defrost energy flow during continuous frosting/defrosting cycles are presented. Also, the distribution of retained meltwater on the outdoor microchannel heat exchanger is firstly reported in the open literature. The results show that it costs less energy per operating time to defrost when applying 10 times instead of 5 times the initial DPea as the defrost-initiation criterion. The data show less even frost distribution as the number of defrosting cycles increases, which can cause more heat loss to the ambient and reduce the defrosting efficiency.

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  • Original title: An experimental study of defrosting energy of an R744 automobile air-source heat pump system with different defrost-initiation criteria.
  • Record ID : 30030491
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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