未来的光电热电混合系统

G. Min
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引用次数: 6

摘要

光伏-热电(PV-TE)混合系统是一个很有吸引力的想法,因为它有可能收集光伏转换过程中产生的热能或通过冷却来减轻温度效应。开发PV-TE混合系统的基本原理如图1所示,图1描述了三种可能的策略,这些策略可能导致混合系统的整体效率高于单独的光伏系统。在策略(a)中,热电装置用作直接与太阳能电池接触的冷却器。由于太阳能电池表现为负温度系数,降低太阳能电池的工作温度可以导致太阳能电池输出功率的增加。在策略(b)中,热电装置以与策略(a)相似的方式布置,但用作热电发电机。太阳能电池内部的热化损失将导致太阳能电池温度的增加,这反过来又在热电发电机上建立了温差。因此,来自太阳能电池的废热能可以被热电发电机利用,转化为有用的电能。在策略(c)中,将对太阳能电池毫无用处的红外光谱太阳能从可见光谱中分离出来,引导到热电发电机中发电。显然,这些策略是建立在合理的科学基础之上的。关键的问题是,当考虑到其他影响时,它们是否会导致现实的改善。本文旨在对这些研究方向的前景进行批判性评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prospective Photovoltaic-Thermoelectric Hybrid System
Photovoltaic-thermoelectric (PV-TE) hybrid system is an appealing idea due to its potential to harvest thermal energy produced in photovoltaic conversion process or mitigate the temperature effect through cooling. The rationale for developing PV-TE hybrid system is illustrated in Fig. 1, which depicts three possible strategies that might lead to a higher overall efficiency of the hybrid system than that of photovoltaic system alone. In strategy (a), thermoelectric device is used as a cooler that is in direct contact with the solar cells. Since the solar cells exhibit negative temperature coefficient, reducing the operating temperature of the solar cells could lead to an increase in the power output of the solar cell. In strategy (b), thermoelectric device is arranged in similar manner as strategy (a) but used as a thermoelectric generator. Thermalisation loss inside solar cells will lead to an increase in the temperature of the solar cells, which in turn establishes a temperature difference across the thermoelectric generator. As a result, the waste thermal energy from the solar cell can be utilised by thermoelectric generator to convert into useful electric power. In strategy (c), the solar energy in infrared spectrum, which has no use to solar cells, is separated from the visible spectrum and directed to a thermoelectric generator for power generation. Clearly, these strategies are built on the sound scientific rationales. The key question is if they will lead to a realistic improvement when other influences are taken into consideration. This paper aims to offer critical assessments on the prospect in these research directions.
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