湖水源热泵机组性能系数简化计算模型研究

Study on Model for Simplified Calculation of Performance Coefficient of Lake-water Source Heat Pump Unit

对于湖水源地源热泵,供冷期冷凝器进水温度为水源温度,蒸发器出水温度为负荷侧(用户)供水温度;供暖期蒸发器进水温度为水源温度,冷凝器出水温度为负荷侧(用户)供水温度。基于将冷凝器、蒸发器进出水温度作为变量的热泵机组性能系数的计算模型(在计算制冷性能系数时,将冷凝器进水温度、蒸发器出水温度作为变量;在计算制热性能系数时,将蒸发器进水温度、冷凝器出水温度作为变量),结合某湖水源热泵系统的实测结果,建立水源温度与空气干球温度的函数关系,将负荷侧供水温度简化为历年负荷侧供水温度算术平均值,对计算模型进行适当简化。对简化后的计算模型计算精度进行检验,计算精度可以接受。

For lake-water source heat pump, the inlet temperature of condenser is the water source temperature, and the outlet temperature of evaporator is the supply water temperature at load side （user） during cooling period ; while the inlet temperature of e- vaporator is the water source temperature, and the out-let temperature of condenser is the supply water tem- perature at load side （user） during heating period. Based on the model to calculate the performance coeffi- cient of heat pump by using the inlet and outlet temper- ature of condenser and evaporator as variables （ in the calculation of？ refrigerant coefficient of performance, the inlet temperature of condenser and the outlet tem- perature of evaporator are used as variables ; in the cal- culation of heating coefficient of performance, the inlet temperature of evaporator and the outlet temperature of condenser are used as variables）, combined with themeasured results of a lake-water source heat pump sys- tem, the functional relationship between source water temperature and air dry bulb temperature is estab- lished, the supply water temperature at load side is simplified as the arithmetic mean of the supply water temperature at load side during past years, and the cal- culation model is simplified properly. The accuracy of the simplified calculation model is tested, and the ac- curacy of calculation can be accepted.