Photovoltaic thermal module and solar thermal collector connected in series to produce electricity and high-grade heat simultaneously
Photovoltaic thermal module and solar thermal collector connected in series to produce electricity and high-grade heat simultaneously
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DOI：
10.1016/j.apenergy.2019.114380
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发表时间：
2020-03
期刊：
影响因子：
11.2
通讯作者：
T. Ma;Meng Li;A. Kazemian
中科院分区：
文献类型：
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作者：
T. Ma;Meng Li;A. Kazemian
光伏光热（PVT）模块可以同时发电和供热，但其出口温度通常不高，可能无法满足建筑物的热水和空间供暖要求。本文提出了一种新的太阳能集热器集成系统，即PVT模块与后续的太阳能集热器（ST）串联，以克服PVT模块输出温度低和ST不能发电的缺点。PVT-ST系统的电气和整体性能。利用实验数据对数学模型进行了验证，结果表明，数值计算结果与实测数据吻合较好，均方根偏差小于1.39%。对比研究表明，PVT-ST系统的电效率略低，但能输出较高品位的热能，一次节能效果较好，这两方面的效果使其在电、热兼用的住宅建筑中具有广阔的应用前景。在上海地区，PVT-ST系统的日平均发电量为0.82 kWh，日平均供热量为5.75 kWh，一次能源节约率为83.48%。最后，一个参数分析表明，太阳辐射和质量流量显示出积极的影响，而负面影响是从入口水温观察。
The photovoltaic thermal (PVT) module can produce electricity and heat simultaneously, while its outlet temperature is usually not high and might not be able to meet the requirement for hot water and spacing heating in buildings. In this study, an innovative integrated system is proposed that a PVT module is series-connected with a following solar thermal (ST) collector, renamed as PVT-ST, to overcome the drawback of low output temperature of PVT and no electrical generation of ST. The feasibility of the proposed system is discussed first, and a steady two-dimensional model is developed to investigate the thermal, electrical and overall performance of the PVT-ST system. The mathematical model is also validated based on the experimental data, revealing that the numerical results agree well with the collected data, with root mean square deviation lower than 1.39%. A comparative study is then conducted, and indicates that the PVT-ST system has slightly lower electrical efficiency but can output relatively high-grade thermal energy and performs much better in primary energy saving efficiency, the duel effects could make the system promising in residential buildings which need both electricity and heat. The PVT-ST system, occupying 1.65 m2for both the PVT and ST collector, can output in average 0.82 kWh/day electricity and 5.75 kWh/day heat in Shanghai, as a result 83.48% of primary energy saving efficiency is achieved. Finally, a parametric analysis explicates that solar radiation and mass flow rate shows positive effects on overall performance, whereas a negative effect is observed from the inlet water temperature.