基于微细通道集热/蒸发器的太阳能热泵热水系统性能模拟与实验研究

Performance simulation and experimental study of solar heat pump water heating system with micro-channel collector/evaporator

提出了一种自主设计的微细通道集热/蒸发器,采用树形分支模型,由2块铝板冷轧吹胀而成,减小了接触热阻,提高了集热器的换热系数。将集热/蒸发器应用到太阳能热泵热水系统中,介绍了集热/蒸发器的数学模型。通过模拟和实验研究,分析了不同工况条件下系统性能系数COP、集热器集热效率、加热时间及各运行参数的变化特性。结果显示:将150L水从15℃加热到50℃时,系统全年平均COP为4.8,平均集热效率为1.3,平均加热时间为314min;环境温度的升高和太阳辐照度的降低会使集热效率显著增大;热泵系统性能的模拟结果与实验结果变化趋势一致,证明了数学模型和计算方法的可行性。

Presents a novel micro-channel collector/evaporator which uses the tree branch model and is made of two pieces of aluminum plates by the method of cold rolling and blow molding, it reduces the contact thermal resistance and improves the heat transfer coefficient. Integrates the heat collector/ evaporator into a solar heat pump water heating system. Presents the mathematical model of the heat collector/evaporator. Through the simulation and experimental research, analyses the variation characteristics of the system COP, heat collecting efficiency, heating time of hot water and operating parameters under different ambient conditions. The results show that when heating 150 L water from 15 ℃ to 50 ℃, the annual average system COP, heat collecting efficiency and heating time are 4.8, 1.3 and 314 rain, respectively. The heat collecting efficiency increases evidently with the increase of ambient temperature and the decrease of solar irradiance. The system simulation results are in good agreement with experimental ones, which indicates the feasibility of the method of calculation and mathematical model.