中文摘要：

针对HFC410A制冷空调系统开发的具有两级膨胀过程的滑片式膨胀机,其内容积比为7.66且满足HFC410A高容积膨胀比的要求,搭建了HFC410A制冷空调实验系统,并对不同工况和转速下的样机进行了实验研究。结果表明：两级滑片式膨胀机系统的性能系数（COP）最多提高11.7%,最大等熵效率为33.7%,在常规压比下膨胀机的最佳转速为1 300～1 400r/min;高压工况下摩擦损失减少,膨胀机输出功增大,有益于系统COP提升;过冷度增大,系统制冷量提高,有益于系统COP提升,但膨胀机回收功减小,相对于节流阀系统的COP提高率减小,膨胀机替换节流阀后的经济性优势降低,系统过冷度对膨胀机等熵效率和容积效率的影响较小。

英文摘要：

Work recovery expanders to extract and utilize throttling loss of refrigerants during expansion process can efficiently improve the coefficient of performance（COP） of the systems.A two-stage rotary vane expander was developed in an HFC410A air-conditioning system.The expander possessed the built-in ratio of 7.66 which satisfied the large volumetric expansion ratio for HFC410A.An HFC410A air-conditioning test system was built,and the prototype was tested under various system conditions and at different rotating speeds.From the experimental data,the COP of the prototype increased by up to 11.7%,the maximum isentropic efficiency of the prototype was 33.7%,and the optimum rotating speed was 1 300-1 400 r/min at the regular pressure ratio.The frictional losses could be reduced at high pressures,thus improving the output power of the expander and the system COP.Though increasing subcooling degree would increase the system COP by enhancing the cooling capacity,the output power of the expander decreased,thus reducing the COP improvement compared with the COP of the system with a throttle valve.However,little influence of subcooling degree on the isentropic efficiency and the volumetric efficiency of the expander was observed.