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Performance analysis of photovoltaic-thermoelectric hybrid system with and without glass cover

机译：带玻璃盖和不带玻璃盖的光电热电混合系统的性能分析

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This paper establishes a theoretical model for assessing the performance of glazed/unglazed photovoltaic-thermoelectric (PV-TE) hybrid system. To enhance the heat removal, nanofluid is served as heat sink. Firstly, a performance comparison between glazed and unglazed system is given. It is suggested that, under the condition of higher figure of merit Z and concentration ratio C. as well as enhanced transmissivity of glass cover, glazed system may be competitive or even superior to the unglazed one. Environmental effect such as wind velocity, is also a significant factor which may be ignored in the existing researches. Therefore, considering the coupling effect of wind velocity and nanofluid flow rate, the impacts of some key parameters on the system overall efficiency are examined in the following part. It is found for certain TE modules, a higher figure of merit Z may still cause a decrease in the system overall efficiency resulting from the different parameter values, that is, Seebeck coefficient s, electrical resistivity rho and thermal conductivity lambda. When thermoelectric efficiency eta(TE) reaches maximum, the obtained optimal load resistance R-1 is larger than that corresponding to maximum overall efficiency eta. With varying wind velocity, the maximum overall efficiency could achieve at maximum or minimum wind velocity, corresponding to Z = 0.0021 K-1 and Z = 0.0085 K-1 conditions, respectively. In addition, nanofluid shows better performance-than water. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文建立了评估釉面/非釉面光伏-热电（PV-TE）混合系统性能的理论模型。为了增强散热，纳米流体用作散热器。首先，给出了釉面系统和非釉面系统之间的性能比较。建议在较高的品质因数Z和浓度比C的条件下，以及提高玻璃盖的透射率的情况下，釉面体系可能比无釉体系更具竞争力甚至更好。环境效应，例如风速，也是一个重要因素，在现有研究中可能被忽略。因此，考虑风速和纳米流体流速的耦合效应，以下部分将考察一些关键参数对系统整体效率的影响。已发现对于某些TE模块，较高的品质因数Z仍可能由于不同的参数值（即塞贝克系数s，电阻率rho和热导率λ）而导致系统整体效率降低。当热电效率eta（TE）达到最大值时，获得的最佳负载电阻R-1大于对应于最大总体效率eta的电阻。在风速变化的情况下，最大总效率可以在最大或最小风速下实现，分别对应于Z = 0.0021 K-1和Z = 0.0085 K-1条件。此外，纳米流体比水显示出更好的性能。 （C）2015 Elsevier Ltd.保留所有权利。

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