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A holistic approach to thermodynamic analysis of photo-thermo-electrical processes in a photovoltaic cell

机译：光伏电池中光电热过程热力学分析的整体方法

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In this study, a novel approach for energy and exergy analyses of a photovoltaic (PV) cell is presented, and the exergy destructions within the relevant optical, thermal and electrical processes are quantified. The present study uses a holistic approach to cover all processes and their interactions inside a PV cell; such as photonic: photons transmission, reflection and spectral absorption, background (blackbody) radiation emission at cell temperature; electrical: electron excitation to create a photocurrent, electron-hole recombination, electrical power transmission to an external load; and thermal: internal heat generation by shunt and series resistances, and heat dissipation by conduction-convection. A physical model which considers the highly complex interaction and interdependence among these processes is introduced based on energy and exergy balances completed by writing various constitutive equations; including correlations for the convective heat transfer coefficient and the photocurrent dependence of the spectral distribution of the quantum efficiency. The irreversibilities caused by the processes are assessed in terms of their relative magnitudes of the exergy destructions. The largest exergy destruction occurs in PV generator-photo current generation process followed by wafer-light absorption process. The overall energy and exergy efficiencies are then determined based on the novel model for seven different atmospheric and ecological conditions. The lowest and highest exergy efficiencies of the PV cell are calculated as 9.3% and 14% for two sample locations as Oshawa in Canada and Emirdag in Turkey, respectively. Furthermore, the effects of varying ambient conditions, light spectrum, wind velocity and solar intensity on the PV cell performance are investigated for comparative evaluations. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这项研究中，提出了一种用于光伏（PV）电池能量和火用分析的新颖方法，并对相关光，热和电过程中的火用破坏进行了量化。本研究采用整体方法来涵盖光伏电池内部的所有过程及其相互作用。例如光子：光子传输，反射和光谱吸收，细胞温度下的背景（黑体）辐射发射；电气：电子激发产生光电流，电子-空穴复合，将电能传输到外部负载；散热：通过并联电阻和串联电阻产生内部热量，通过传导对流散热。基于通过编写各种本构方程完成的能量和火用平衡，引入了考虑这些过程之间高度复杂的相互作用和相互依赖性的物理模型。包括对流传热系数和光电流对光谱效率的光谱分布的依赖性。由过程引起的不可逆性根据其火用破坏的相对幅度进行评估。最大的本能破坏发生在PV发生器-光电流产生过程中，接着是晶片光吸收过程中。然后根据新模型针对七个不同的大气和生态条件确定总的能量和火用效率。对于两个样本位置（如加拿大的Oshawa和土耳其的Emirdag），PV电池的最低和最高火用效率分别计算为9.3％和14％。此外，研究了变化的环境条件，光谱，风速和太阳强度对光伏电池性能的影响，以进行比较评估。 （C）2016 Elsevier Ltd.保留所有权利。

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