为研究间接膨胀式太阳能高温热泵系统实际应用的可行性和有效性，搭建实验平台，在天津地区气象条件下对高温热泵全天动态运行特性开展实验研究，分析太阳辐射强度、水箱储热性能、冷凝温度及膨胀阀开度对系统运行性能影响。结果表明:平均太阳辐射强度由396 W/m2增加到563 W/m2，高温热泵性能系数COP由3.62增至3.93；因水箱储热功能，间接膨胀式系统在太阳辐射强度剧烈波动时能够保持高温热泵相对稳定的蒸发温度；当蒸发温度固定时高温热泵COP随冷凝温度升高而降低，冷凝温度由70 ℃增至80 ℃，COP由4.32降至2.76；膨胀阀开度由150步增至250步，高温热泵全天平均COP由3.14升至5.12，排气压力降低46%。

In order to explore the feasibility and effectiveness of the practical application of indirect expansion solar high temperature heat pump system, its experimental platform was built, and the allday dynamic operation characteristics of the high temperature heat pump were experimentally studied under the meteorological conditions in Tianjin. Furthermore, the effects of solar radiation intensity, heat storage performance of water tank, condensation temperature and expansion valve opening degree on system operation performance were analyzed. The results show that the average solar radiation intensity increases from 396 W/m2 to 563 W/m2, and the coefficient of performance (COP) of the high temperature heat pump increases from 3.62 to 3.93.Because of the heat storage function of water tank,the indirect expansion system can maintain the relatively stable evaporation temperature of the high temperature heat pump when the solar radiation intensity fluctuates violently. When the evaporation temperature is fixed, the COP of high temperature heat pump decreases with the increase of condensation temperature. When the condensation temperature increases from 70 ℃ to 80 ℃,the COP decreases from 4.32 to 2.76. When the opening degree of expansion valve increases from 150 steps to 250 steps, the allday average COP of high temperature heat pump increases from 3.14 to 5.12 and the exhaust pressure decreases by 46%.

TK519

河北省自然科学基金资助项目（E2019202089）；天津市技术创新引导专项基金（20YDTPJC00190）；河北省高等学校科学技术青年拔尖项（BJ202102021）；河北省青年科学基金（E2021202034）