中间补气量对经济器热泵系统性能的影响

对带经济器的热泵系统进行了理论分析，建立了整个系统的数学模型，进行了实验研究，研究分析了低温工况下中间补气量对各系统性能的影响。结果表明：在低温环境下，系统的制热量、压缩机功率都会随中间补气量的增加而增加，排气温度随中间补气量的增加而显著减小，系统COP先增加后减小，根据实验结果可知最优的中间补气量，约占环境温度下系统总质量流量的10-14%。

Effects of the Intermediate Gas Injection on the performance of Heat Pump with an Economizer

Theoretical analysis of a heat pump with an economizer have been presented in this paper. The mathematic models of the heat pump system have been developed and experiments have been conducted to investigate the impacts of the gas injection on heat pump performance under low ambient temperatures. The results indicate that the heating capacity and the power consumption go up when the amount of gas injection increases under low ambient temperatures. The discharge temperature declines with the increment of gas injection, while the COP of the heat pump rises first and then descends. According to the test results, the optimal amount of gas injection is about 10%-14% of the total mass flow rate in the heat pump system.