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Heat transfer analysis of PV integrated modified greenhouse dryer

机译：光伏集成改性温室干燥机的传热分析

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摘要

A PV integrated greenhouse dryer has been fabricated with a unique solar collector and tested in no-load condition under forced convection mode. Various important thermal performance indicators such as heat utilisation factors, convective heat transfer coefficient, coefficient of performance and percentage of net heat gain have been evaluated to validate the effectiveness of modifications. Energy, electrical and exergy efficiencies have been also analysed for installed PV system for exhaust fan. Greenhouse dryer experiments have been conducted for with and without solar collector conditions. The enhancement in the highest convective heat transfer coefficient for the greenhouse dryer with solar collector condition is 150% in comparison to the absence of solar collector. Heat utilisation factor and coefficient of performance are found 10.1% and 7.9%, respectively, higher than greenhouse dryer without solar collector. The maximum energy and exergy efficiencies are found 16.8% and 21.4% for greenhouse dryer with and without solar collector, respectively. These results represent the effectiveness of solar collector placed inside the dryer and insulated north wall. The designed greenhouse dryer with solar collector is proposed as most suitable dryer for crop drying in the temperature range of 40-70 degrees C. (C) 2018 Elsevier Ltd. All rights reserved.
机译：光伏集成式温室干燥机采用独特的太阳能收集器制造，并在强制对流模式下的空载条件下进行了测试。评估了各种重要的热性能指标，例如热利用率，对流传热系数，性能系数和净热增益百分比，以验证修改的有效性。还对已安装的排风扇PV系统的能源，电气和火用效率进行了分析。已经在有和没有太阳能收集器条件下进行了温室干燥机实验。与没有太阳能收集器的情况相比，具有太阳能收集器条件的温室干燥机的最高对流传热系数提高了150％。发现热利用率和性能系数分别比没有太阳能集热器的温室干燥机高10.1％和7.9％。带有和不带有太阳能集热器的温室干燥机的最大能量和火用效率分别为16.8％和21.4％。这些结果代表了将太阳能集热器放置在干燥机内部并隔热的北墙中的有效性。建议将设计好的带有太阳能集热器的温室干燥机作为最适合在40-70摄氏度温度范围内进行农作物干燥的干燥机。（C）2018 Elsevier Ltd.保留所有权利。

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