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An experimental investigation of oil circulation ratio influence on heating performance in an air condition heat pump system for electrical vehicles.

Author(s) : LI K., LUO S., WANG Z., SU L., FANG Y., ZHOU X., ZHANG H., TU R.

Type of article: IJR article

Summary

Oil, lubricating and cooling the sliding parts of the compressorcomponents exposed to friction, could prevent refrigerant gas leakage in compressor chamber of vapor compression air conditioning system. For air condition heat pump system in electric vehicles, no oil circulating routes and oil separator are used to drive oil from system to compressor, making oil retainedmore difficult to control. Oil accumulated in heat exchanger and expansion valve would enhance pressure drops and reduce heat transfer capacity, leading to decrease of entire heating performance in cold climate. In this paper, a newly designed air conditioning heat pump system with R134a and PAG46 oil is introduced firstly, and oil circulation experiments were conducted on a full-scale electric vehicle. Typical heat transfer characteristics and system performance parameter were recorded and analyzed subsequently under different compressor oil charge conditions, including excessive charge and insufficient charge. Oil circulation rates in system were also measured and exhibited an increasing trend with compressor oil charge mass. Furthermore, heating performances of the system under different oil circulation rate were compared by various heating capacity and pressure drops. Results showed that both excessive and insufficient charge might decrease heating performance, i.e., determination of suitable oil charge is quite important for air condition heat pump system.

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Pages: 220-231

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Details

  • Original title: An experimental investigation of oil circulation ratio influence on heating performance in an air condition heat pump system for electrical vehicles.
  • Record ID : 30028120
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 122
  • Publication date: 2021/02
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.11.007
  • Document available for consultation in the library of the IIR headquarters only.

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