冰箱用压缩机变工况运行的热力性能实验研究

Experimental Study on Thermodynamic Performance of Refrigerator Compressor Running at Variable Condition

采用实验的方法,以R600a为工质,吸排气压力为自变量,分析了吸排气压力对往复压缩机的热力性能影响。实验结果表明:在其他参数不变时,提高吸气压力使制冷量和功耗增加,但因制冷量增幅比功耗增幅大,故性能系数COP增加;提高排气压力造成压缩机制冷量降低,功耗反而增大,COP显著降低,排气温度先降低后升高,运行经济性变差。

The paper adopts the method of experiment, the reciprocating compressor takes R600a as the refrigerant and suction and discharge pressure as the independent variable, analyses the impact of suction and discharge pressure on the thermodynamic perfor- mance. The experiment result shows that elevation of suction will increase the refrigeration capacity and power consumption with oth- er parameters unchanged, but the growth range of refrigeration capacity is greater than power consumption, so coefficient of perfor- mance （COP） increases. The increasing of discharge pressure will make the refrigeration capacity of compressor reduce, power con- sumption increase, coefficient of performance （COP） significantly reduce, the discharge temperature reduce at first and rise afterwards, and this will make the operational efficiency of reciprocating compressor worse.