平板太阳能空气加热器不同进出口位置的CFD模拟与实验研究

Tigabu Mekonnen Belay, Samson Mekbib Atnaw
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引用次数: 0

摘要

本研究对单流平板矩形箱主动式太阳能空气加热器进行了设计、构建、CFD流体流动(fluent)软件理论研究和实验验证。太阳能空气加热器的内部尺寸分别为长100厘米、宽50厘米,吸收板与上釉玻璃之间的气隙为9厘米。太阳能空气加热器由18毫米厚的胶合板、4毫米厚的上釉玻璃和1毫米厚的铝板组成。除了上釉玻璃外,其他建筑材料都涂成黑色以吸收太阳辐射。入口和出口的位置取决于太阳能空气加热器宽度的比例。根据太阳能空气加热器三天的平均出口温度,与其他主动式太阳能空气加热器和环境空气温度相比,太阳能空气加热器B的平均出口温度最高。根据太阳能空气加热器3天的平均出口温度和环境空气温度,主动式太阳能空气加热器B的出口温度比环境空气平均温度高33.83%。受空气速度的影响,被动式太阳能空气加热器的平均出口温度比环境空气和主动式太阳能空气加热器的平均出口温度分别提高了17%和4.43%。测量空气温度的仪器的不确定度为±0.289℃,太阳能空气加热器的不确定度为±0.462℃。3月份在纬度8.89°的倾斜角为12°处,平均出风口温度较高。在纬度8.89°处,5月份的负倾斜角表明太阳能空气加热器朝向南方较好。被动式太阳能空气加热器和环境空气温度的波动比主动式太阳能空气集热器大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CFD Simulations and Experimental Investigation of a Flat-Plate Solar Air Heater at Different Positions of Inlet and Outlet
In this study, the effects of the positions of inlet and outlet in a single-flow flat plate rectangular box active solar air heater due to convective heat transfer were designed, constructed, theoretically investigated using CFD fluid flow (fluent) software, and experimentally examined. The internal dimensions of the solar air heater are length and width of 100 cm and 50 cm, respectively, and the air gap between absorber plate and glazing glass is 9 cm. The solar air heaters are constructed with 18 mm thickness plywood, 4 mm thickness glazing glass, and 1 mm thickness aluminium sheet metal. Except for the glazing glass, other construction materials are painted black to absorb solar radiation. The positions of the inlet and outlet depend on the fraction of the width of the solar air heater. Based on the three-day average outlet temperature of the solar air heaters, solar air heater B has the highest average outlet temperature compared with other active solar air heaters and ambient air temperatures. Based on the three-day average outlet temperature of solar air heaters and ambient air temperatures, the active solar air heater B outlet temperature is 33.83 percent greater than the ambient air average temperature. The average outlet temperature of the air in passive solar air heaters increased by 17% and 4.43% compared to ambient air and active solar air heaters outlet air temperatures, respectively, due to the speed of the air in the solar air heater. The uncertainty of the instruments to measure the temperature of the air is ± 0.289°C, and the uncertainty of the solar air heater is ± 0.462°C. A higher average air outlet temperature was achieved in March at a tilt angle of 12° at a latitude of 8.89°. The negative tilt angle in May at a latitude of 8.89° indicates the south-facing orientation of solar air heaters is better. The passive solar air heater and ambient air temperature have a higher air temperature fluctuation than the active solar air collector.
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