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Experimental study on improved performance of an automotive CO2 air conditioning system with an evaporative gas cooler.

Author(s) : SONG X., YUAN H., ZHANG Y., YU B., WANG D., SHI J., CHEN J.

Type of article: IJR article

Summary

A well-known challenge in the application of carbon dioxide (CO2) refrigerant for vehicles is the great energy efficiency attenuation in hot climates. In attempting to solve this problem, a novel design integrating evaporative cooling with automotive CO2 air conditioning system, where water was sprayed to the gas cooler, was introduced and experimentally investigated in present work. Results illustrate that with this design the CO2 temperature leaving gas cooler could be reduced to a lower level or even below the outdoor air temperature, thus inducing a significant performance improvement. A coefficient of performance (COP) enhancement percentage of 42.4% was achieved at 35°C outdoor condition. This percentage was increased up to 52.9% when outdoor air temperature increased to 45°C. With the decreased outdoor air velocity and the decreased outdoor air humidity, the merit of this design was more significant. These indicate that the evaporative gas cooler is a promising technology to alleviate the problem of performance deterioration in hot and dry weather conditions. A reduced spray water temperature could not cause a significant change in the COP enhancement. This may be attributed to that the sensible heat during droplet heat-up period was negligible compared to the latent heat of droplet evaporation. When the surface position of gas cooler chosen to be sprayed was moved from CO2 inlet to CO2 outlet, the COP enhancement increased, which suggests that water should be sprayed to the area where wall temperature is low.

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Pages: 39-48

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Details

  • Original title: Experimental study on improved performance of an automotive CO2 air conditioning system with an evaporative gas cooler.
  • Record ID : 30029943
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 140
  • Publication date: 2022/08
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.05.009
  • Document available for consultation in the library of the IIR headquarters only.

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