直膨式太阳能PVT热泵热水系统在不同城市运行性能仿真与分析

Performance Simulation and Analysis of Solar-assisted Direct-expansion PVT Heat Pump Hot Water System in Different Cities

基于直膨式太阳能光伏光热(PVT)热泵热水系统的工作原理,根据迭代算法建立了系统的仿真模型,以探究系统在不同环境条件下的运行性能。结果表明:在上海、北京、拉萨、兰州、昆明和广州,直膨式PVT热泵热水系统在夏季典型工作日的平均COP分别为7.34、7.30、6.98、8.18、6.24和6.79,加热定量热水所需时间分别为275 min、273 min、279 min、243 min、314 min和295 min,冬季典型工作日的平均COP分别为5.59、5.21、6.05、5.03、6.48和5.43,加热定量热水所需时间分别为344 min、364 min、316 min、376 min、298 min和359 min;在上海、北京、拉萨、兰州、昆明和广州,相对于纯光伏组件,PVT组件的全年平均发电增益分别为9.28%、8.56%、10.42%、10.01%、7.70%和7.64%。

The simulation model of the direct-expansion PVT heat pump hot water system was developed based on its working principle by iteration algorithm to investigate the system performance under various environmental conditions.Results show that in Shanghai,Beijing,Lhasa,Lanzhou,Kunming and Guangzhou,the average COP of direct-expansion PVT heat pump hot water system on typical days in summer is 7.34,7.30,6.98,8.18,6.24 and 6.79,and the heating time for given amount of water is 275 min,273 min,279 min,243 min,314 min and 295 min,respectively.The average COP of direct-expansion PVT heat pump hot water system on typical days in winter is 5.59,5.21,6.05,5.03,6.48 and 5.43,and the heating time for given amount of water is 344 min,364 min,316 min,376 min,298 min and 359 min,respectively.In the above-mentioned cities,compared to pure photovoltaic modules,the annually-averaged electricity generation benefits of PVT modules are 9.28%,8.56%,10.42%,10.01%,7.70%,7.64%,respectively.