CO2 is a safe natrual refrigerant which had been and will be widely used in air condi-tioning and heat pump systems. The thernodynamic analysis of the CO2 transcritical cycleis presented in this paper. The result show...CO2 is a safe natrual refrigerant which had been and will be widely used in air condi-tioning and heat pump systems. The thernodynamic analysis of the CO2 transcritical cycleis presented in this paper. The result shows that the CO2 cycles offers heat recovery benefitas a heat pump system. It is possible that the COP value of CO2 cycle can compete withthose of R22 or R134a if two stage compression system or an expander system are used.展开更多
开发CO_2跨临界汽车热泵,是解决R134a汽车热泵在低温环境下制热量不足、无法正常工作问题的有效措施。本文理论分析了影响CO_2汽车热泵性能的关键因素,在最低为-20℃的环境温度下实验研究了CO_2汽车热泵的性能。结果表明:开发的CO_2汽...开发CO_2跨临界汽车热泵,是解决R134a汽车热泵在低温环境下制热量不足、无法正常工作问题的有效措施。本文理论分析了影响CO_2汽车热泵性能的关键因素,在最低为-20℃的环境温度下实验研究了CO_2汽车热泵的性能。结果表明:开发的CO_2汽车热泵系统在低温环境下稳定运行,具有较好的制热性能;在相同压缩机转速条件下,室内进风温度对制热COP(COP_h)影响更大,室外环境温度对制热量影响更大;在-20℃环境冷启动工况下COP_h可达到3.15、制热量为3.6 k W;进风(Tg,a,in)和出风(Tg,a,out)温度分别为20℃和40℃时,COP_h最低为1.72。因此,与R134a相比,CO_2车用热泵系统的低温制热性能有显著的优势,该系统在电动汽车上具有较好的应用潜力。展开更多
文摘CO2 is a safe natrual refrigerant which had been and will be widely used in air condi-tioning and heat pump systems. The thernodynamic analysis of the CO2 transcritical cycleis presented in this paper. The result shows that the CO2 cycles offers heat recovery benefitas a heat pump system. It is possible that the COP value of CO2 cycle can compete withthose of R22 or R134a if two stage compression system or an expander system are used.
文摘开发CO_2跨临界汽车热泵,是解决R134a汽车热泵在低温环境下制热量不足、无法正常工作问题的有效措施。本文理论分析了影响CO_2汽车热泵性能的关键因素,在最低为-20℃的环境温度下实验研究了CO_2汽车热泵的性能。结果表明:开发的CO_2汽车热泵系统在低温环境下稳定运行,具有较好的制热性能;在相同压缩机转速条件下,室内进风温度对制热COP(COP_h)影响更大,室外环境温度对制热量影响更大;在-20℃环境冷启动工况下COP_h可达到3.15、制热量为3.6 k W;进风(Tg,a,in)和出风(Tg,a,out)温度分别为20℃和40℃时,COP_h最低为1.72。因此,与R134a相比,CO_2车用热泵系统的低温制热性能有显著的优势,该系统在电动汽车上具有较好的应用潜力。
