Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Performance Evaluation of a $CO_2$ Heat Pump System for Fuel Cell Vehicles

연료전지 자동차용 이산화탄소 열펌프 시스템의 성능평가

  • Kim, Sung-Chul (Thermal Management Research Team, Korea Automotive Technology Institute) ;
  • Park, Jong-Chul (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Won, Jong-Phil (Thermal Management Research Team, Korea Automotive Technology Institute)
  • 김성철 (자동차부품연구원 열제어연구팀) ;
  • 박종철 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부) ;
  • 원종필 (자동차부품연구원 열제어연구팀)
  • Published : 2008.02.01
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Abstract

The global warming potential (GWP) of $CO_2$ refrigerant is 1/1300 times lower than that of R134a. Furthermore, the size and weight of the automotive heat pump system can decrease because $CO_2$ operates at high pressure with significantly higher discharge temperature and larger temperature change. The presented $CO_2$ heat pump system was designed for both cooling and heating in fuel cell vehicles. In this study, the performance characteristics of the heat pump system were analyzed for heating, and results for performance were provided for operating conditions when using recovered heat from the stack coolant. The performance of the heat pump system with heater core was compared with that of the conventional heating system with heater core and that of the heat pump system without heater core, and thus the heat pump system with heater core showed the best performance among the selected heating systems. On the other hand, the heating performance of two different types of coolant/air heat pump systems with heater core was compared each other at various coolant inlet temperatures. Furthermore, to use exhausted thermal energy through the radiator, experiments were carried out by changing the arrangement of a radiator and an outdoor evaporator, and quantified the heating effectiveness.

Keywords

References

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