中文摘要：

通过实验研究，与其他制冷剂相比，北洋3号制冷剂在较高蒸发温度下具有最佳的热工性能．应用多元回归分析方法，建立高温热泵实验的性能系数（COP）数学模型，得出冷凝器和蒸发器进出口水温、机组制热量和高温热泵COP值的函数表达式，为高温热泵的研发，特别是工质的筛选研究工作提供了更为精确可靠的参考依据．将高温热泵技术应用于城市区域供热系统，实现城镇供热系统的热扩容．这种技术的特点是供回水温差大、供热系统热容量高、管网初投资低，且循环水泵能耗少，对城市的热负荷变化适应能力强．

英文摘要：

Compared with other refrigerants, BY-3 has been found to have the best of the thermal performance in the higher evaporation temperature conditions by experiment analysis. The multiple regression analysis method was used to build up the mathematical model of coefficient of performance （COP） in the high temperature heat pump experi ment. On the basis of the experimental data, water temperature of the condenser and evaporator on the exit/ entrance, the quantity of heat and the functional formula of the COP were concluded. Multiple regression analysis method plays an important role in the screening of the refrigerations. The dilatancy technology with high-temperature heat pump can be applied to district heating system to improve the capacity of heating. The principal advantage of dilatancy technology in the district heating system lies in its capability of increasing the temperature difference and the capacity of heating, reducing the initial investment of primary side network, and saving the operation consumption. And it has the strong adaptability to changes of heating load.