基于光电/光热一体化的太阳能热泵性能分析

Performances of PV/T solar-assisted heat pump system

建立了光电/光热一体化(PV/T)太阳能热泵的数学模型,利用直膨式太阳能热泵实验中获得的数据对模型进行校核,结果显示,模型的计算误差在5%左右。据计算可知,在太阳辐射良好的情况下,PV/T太阳能热泵的COP可达到5以上。在不同的辐射强度下,比较PV/T太阳能热泵与直膨式太阳能热泵的性能,随着太阳辐射强度的提高,系统COP随之提高,热电综合COP平均为7.4,高于直膨式太阳能热泵的COP。结果显示,PV/T太阳能热泵有利于降低系统的能耗,提高光伏组件的光电转化效率,较直膨式太阳能热泵更具节能优势。

Solar photovoltaic/thermal integrated heat pump (PV/T-HP)is expected to realize comprehensive utilization of photovoltaics and thermal.To analyze the performance of PV/T-HP,mathematical models of PV/T evaporator,compressor,water tank and thermal expansion valve are established respectively and linked to form a complete thermodynamic cycle based on energy conservation,mass conservation equation.Simulation is carried out through MATLAB.The model accuracy is validated through direct expansion solar assisted heat pump (DX-SHAP)experiments.The result shows that the simulation error is about 5%,which is acceptable.Comparing the performance of PV/T-HP and DX-SHAP,with the rise in solar radiation intensity,COP both increases.With high solar radiation intensity,COP of PV/T-HP can be more than 5.The comprehensive COP of PV/T-HP is 7.4 on average,which is higher than that of DX-SHAP.The result shows that,PV/T-HP is conductive to reduce energy consumption of the system and improve the photoelectric conversion efficiency of photovoltaic modules,so it has more benefit on energy-saving.