Abstract

The use of solar energy is very promising for favorable Sun Belt countries. However, in these regions the hot climate leads to high temperatures which conduct to significant power losses in photovoltaic panels. In this paper we study the heating behavior of photovoltaic panels and front side water cooling efficiency. A standalone cooling system is designed as prototype which helps to proposal for a methodology for large-scale application through energy estimation of this system. Two typical situations were studied: the first one with a uniform distribution of the temperature and the second one with a non-uniform distribution of temperature under partial shadowing leading to hot spot effect. The gain in electrical power with cooling is about 45% in the case of a non-uniform distribution compared to 12% in the case of a uniform distribution at 30°C outdoor temperature. It was also noticed that temperature on hot spot point depends of the shadow type (direct and indirect). The estimation of the supplement of energy obtained from the cooling system demonstrates that the cooling system used in this study will be beneficial with using of string of PV panels with a minimum of three panels. This makes the autonomous cooling system very efficient.

中文翻译：

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光伏面板的加热行为和正面水冷效率

摘要

太阳能的使用对太阳带国家有利。然而，在这些地区，炎热的气候导致高温，这导致光伏面板中的大量功率损耗。在本文中，我们研究了光伏面板的加热行为和正面水冷效率。一个独立的冷却系统被设计为原型，可通过该系统的能量估算来帮助建议用于大规模应用的方法。研究了两种典型情况：第一种情况是温度均匀分布，第二种情况是在局部阴影下导致热点效应的情况下温度分布不均匀。在分布不均匀的情况下，通过冷却获得的电功率增益约为45％，而在室外温度为30°C的情况下，通过冷却获得的功率增益为12％。还注意到热点上的温度取决于阴影类型（直接和间接）。从冷却系统获得的能量补充的估算表明，本研究中使用的冷却系统将有利于使用最少三个光伏板串的光伏板。这使得自主冷却系统非常高效。从冷却系统获得的能量补充的估算表明，本研究中使用的冷却系统将有利于使用最少三个光伏板串的光伏板。这使得自主冷却系统非常高效。从冷却系统获得的能量补充的估算表明，本研究中使用的冷却系统将有利于使用最少三个光伏板串的光伏板。这使得自主冷却系统非常高效。