Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Experimental Study on the Performance Characteristics of a CO2 Air-conditioning System for Vehicles

자동차용 CO2 에어컨 시스템의 성능 특성에 관한 실험적 연구

  • Lee, Daewoong (Research Division, Halla-Visteon Climate Control Corporation)
  • 이대웅 (한라비스테온공조 연구본부)
  • Received : 2014.02.26
  • Accepted : 2014.05.14
  • Published : 2015.01.01
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Abstract

In this study, a $CO_2$ air-conditioning system was investigated with different types of electrically driven compressors, parallel flow type gas cooler, four-pass type evaporator, internal heat exchanger integrated with accumulator, and electric expansion valve. The experimental study was conducted under various operating conditions (ie., different rotational compressor speeds, air inlet temperatures and air velocity coming into heat exchangers). The experimental results showed the cooling capacity was 3.5kW at $35^{\circ}C$ ambient temperature when the vehicle was idle (ie., the worst condition for cooling off the gas cooler). In terms of performance effect of the compressor, the e-RP model had a slightly better cooling capacity and coefficient of performance than the e-GR model under the same test conditions. An experimental equation for optimum cooling-performance control was also suggested based on the results. A high-pressure control algorithm for the super critical cycle was determined to achieve both maximum cooling performance and efficient energy consumption. The results from the experimental equation coincided with those of previous experimental studies.

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References

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