不同地区太阳能PVT热泵系统仿真模拟与运行性能分析

Simulation and Performance Analysis of Solar-assisted PVT Heat Pump System in Different Areas

为探究环境条件的时空分布差异性对太阳能直膨式光伏光热(PVT)热泵系统运行性能的影响,进行数学建模与性能仿真,分析了系统在不同地区采暖季内的运行性能。结果表明:由于入射太阳辐射的效应,在不同地区,系统的采暖季平均蒸发温度都提高至接近甚至超过环境温度的水平,显著改善了系统的热力性能;当冷凝温度为50℃时,系统在北京、拉萨、兰州的采暖季平均COP分别为3.67、5.01和3.41;采暖季平均单板得热功率分别为541 W、810 W和504 W,得热因子分别为71.7%、62.0%和79.3%,光伏发电增益分别为4.76%、8.67%和6.10%。

In order to reveal the effect of the temporal-spatial variation of the environmental conditions on the performance of the solar-assisted direct expansion photovoltaic-thermal(PVT)heat pump,the mathematical modelling and simulation were conducted.The performance of the PVT heat pump within the heating season in different areas was analyzed.Results show that the average evaporation temperature of the PVT heat pump system is enhanced to the level near to,even over the ambient temperature due to the solar irradiation,which improves the thermodynamic performance considerably.When the condensing temperature is 50℃,the average COP during the heating season in Beijing,Lhasa,and Lanzhou is 3.67,5.01 and 3.41 respectively,the average heat gain power of a single module is 541 W,810 W and 504 W respectively,and the heat gain factor is 71.7%,62.0%and 79.3%respectively,the power generation benefit is 4.76%,8.67%and 6.10%respectively.