HFC134a与HFO1234yf用于汽车空调的理论分析

对HFC134a和HFO1234yf应用于汽车空调进行了理论分析,研究表明:HFC134a的排气温度明显高于HFO1234yf,HFC134a的排气温度随着蒸发温度的升高而降低,HFO1234yf的排气温度随着蒸发温度的升高而升高;HFC134a与HFO1234yf的单位制冷量都是随着蒸发温度的升高而增大,但HFC134a的单位制冷量明显高于HFO1234yf,其平均高于HFO1234yf约34.9kW/kg;HFO1234yf压缩机输入功率明显高于HFC134a;HFC134a的系统COP高于HFO1234yf的系统COP,且二者都是随着蒸发温度的升高而升高,蒸发温度为-10℃时,其系统COP分别为3.739和3.493,蒸发温度为18℃时,其系统COP分别为9.6和9.36。

Application analysis of refrigerant HFC134a and HFO1234yf in automotive air -conditioner

A theory simulation of operation performance about HFC134a and HFO1234yf in automotive air-conditioner has been presented.The results show that the discharge temperature of HFC134a is higher than the discharge temperature of HFO1234yf,but the change trend with the evaporation temperature is different.The discharge temperature of HFC134a reduces with the rising of evaporation temperature and the discharge temperature of HFO1234yf increases with the rising of evaporation temperature.The unit capacity of HFC134a and HFO1234yf rise with the rising of evaporation temperature and the unit capacity of HFC134a is average higher than that of HFO1234yf in 34.9kW/kg.The input power of HFO1234yf is higher than that of HFC134a.The COP of HFC134a is higher than that of HFO1234y and the two refrigerants’ COP increase with the rising of evaporation temperature.When the evaporation is at-10℃,the system COP respectively is 3.739 and 3.493.When the evaporation is at 18℃,the system COP is respectively 9.6 and 9.36.