Investigations on serpentine tube type solar photovoltaic/thermal collector with different heat transfer fluids: Experiment and numerical analysis
Investigations on serpentine tube type solar photovoltaic/thermal collector with different heat transfer fluids: Experiment and numerical analysis
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DOI：
10.1016/j.solener.2016.10.045
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发表时间：
2016-12
期刊：
影响因子：
6.7
通讯作者：
B. Joy;J. Philip;Richu Zachariah
中科院分区：
文献类型：
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作者：
B. Joy;J. Philip;Richu Zachariah
本文对太阳能光伏/热(PV/T)集热器的性能进行了分析，该集热器采用单晶硅光伏电池，在较低的温度下同时产生热和电。实验研究了以水、乙二醇(EG)或其不同比例的混合物为冷却剂的独立光伏集热器和光伏/热电集热器的热电性能。用不同的集热流体测量了PV/T集热器的总能量效率，发现PV/T集热器的效率随着集热流体的导热系数呈指数增长。对于PV/T收集器，水是比EG更好的冷却剂，总体效率提高25%或更多。这归因于与EG相比，水的导热系数更高。通过改变水-EG混合物中水和EG的比例，改变了换热流体的导热系数，得到了太阳能PV/T系统的热效率与集热器导热系数之间的经验关系式。在TRNsys中建立了水基PV/T集热器系统的模型，并将预测的集热器温度和输出功率与纯光伏电池板的温度和输出功率进行了比较，验证了方法的有效性。实验得到的电功率与仿真结果吻合较好。
The performance of a solar photovoltaic/thermal (PV/T) collector with single crystal silicon PV cells in a hybrid energy generation unit, which generates heat and electricity simultaneously at comparatively low temperatures, has been analysed in this work. The thermal and electrical performances of independent PV and PV/T collectors with water, ethylene glycol (EG) or their mixtures at different ratios as coolants are studied experimentally and results reported. The overall energy efficiency of a PV/T collector has been measured with different collector fluids, and it is found that the efficiency of a PV/T collector increases exponentially with thermal conductivity of the collector fluid. For a PV/T collector, water is a better coolant than EG, with an overall efficiency enhancement by 25% or more. This is attributed to high thermal conductivity of water compared to EG. By varying the ratio of water and EG in water-EG mixture, the thermal conductivity of the heat transfer fluid is varied, and an empirical relation between thermal efficiency and collector thermal conductivity for a solar PV/T system is obtained and reported. Water based PV/T collector system is modelled in TRNSYS, and the approach validated by comparing its predicted collector temperature and output power with those of a pure PV panel. The electrical power obtained from the experiment fits well with simulation results.