Exergy analysis of a high concentration photovoltaic and thermal system for comprehensive use of heat and electricity
Exergy analysis of a high concentration photovoltaic and thermal system for comprehensive use of heat and electricity
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热电综合利用高聚光光伏热系统火用分析
DOI：
10.1016/j.energy.2021.120300
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发表时间：
2021-03
期刊：
影响因子：
9
通讯作者：
Yang Zhang
中科院分区：
文献类型：
--
作者：
Haifei Chen;Guiqiang Li;Yang Zhong;Yunjie Wang;Baorui Cai;Jie Yang;Ali Badiei;Yang Zhang
通过分析太阳能电池的温度分布云图，发现温度分布不均匀，存在较大的温度梯度，导致有效电池尺寸减小，需要采用双入口模型。同时建立了仿真和实验，发现仿真结果与实验结果一致。本文提供了不同入口流量、浓度比和入口温度下简单优化模型的热力学效率第一定律和火用分析。结果表明，当入口流量为0.02~0.06 kg/s时，系统运行高效，可以提供可观的热量输出，对电池有更大的保护。当浓缩比增大时，热力效率和火用效率都会降低，但总输出火用呈增加趋势，且随着浓缩比增大，趋势减小。随着冷却水温度的升高，热效率和综合火效率也会提高，当进口温度为60℃时，电效率仍大于20%。在实际应用中，可以通过提高冷却水温度来提高热能质量，拓宽应用领域。
By analyzing the temperature distribution cloud image of the solar cell, it was found that the temperature distribution was uneven and there was a large temperature gradient, resulting in reduced effective cell size requiring a dual inlet model. At the same time, simulations and experiments were established, and it was found that the simulation results were consistent with the experimental results. This paper offers the first law of thermodynamics efficiency and exergy analysis of a simple optimized model at different inlet flow, concentration ratios and inlet temperatures. The result shows that while the inlet flow is 0.02–0.06 kg/s, the system runs efficiently, which can provide considerable heat output, and has greater protection for the cell. When the concentration ratio increases, thermodynamic efficiency and exergy efficiency will decrease, but the total output exergy is in an increasing trend and the trend will decrease as the concentration ratio increases. As the temperature of cooling water increases, the thermal and overall exergetic efficiencies will also increase, and when the inlet temperature is 60 °C, the electrical efficiency is still greater than 20%. In practical applications, the quality of thermal energy can be improved by increasing cooling water temperature, broadening the field of application.
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