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用于食物干燥的带吸收系统的太阳能空气加热器
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作者 黄汉豪 《能量转换利用研究动态》 2002年第5期20-21,共2页
关键词 食物干燥 吸收系统 太阳能空气加热器 平板集热器
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太阳能空气-热水两用型加热器
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《科技开发动态》 2004年第9期19-20,共2页
关键词 太阳能空气-热水加热器 聚氨酯发泡材料 太阳能吸收率 隔热材料
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利用太阳能干燥农产品
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《环境保护》 CAS 1977年第5期38-38,共1页
印度农业研究所设计了一种金属屋顶太阳能干燥器,主要结构有:金属屋顶、通风管道、鼓风机和谷仓。屋顶为涂黑色沥青的波形板,上用透明玻璃和聚乙烯复盖,可增加蓄热。金属屋顶吸收太阳的辐射能,并将热传给管道内的空气。鼓风机吸进被加... 印度农业研究所设计了一种金属屋顶太阳能干燥器,主要结构有:金属屋顶、通风管道、鼓风机和谷仓。屋顶为涂黑色沥青的波形板,上用透明玻璃和聚乙烯复盖,可增加蓄热。金属屋顶吸收太阳的辐射能,并将热传给管道内的空气。鼓风机吸进被加热的空气,并使热空气通过仓内的湿谷层。干燥效果:将湿稻谷铺成45厘米以下各种不同的厚度,当日光强度变化不定,相对湿度为75~95%时,八小时内可使稻谷水分从34.9%降至15%。国外还有用“ 展开更多
关键词 金属屋顶 农产品 太阳能干燥器 鼓风机 太阳能空气加热器 通风管道 农业研究所 聚乙烯 空气 相对湿度
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Experimental Investigation on Turbulent Convection in Solar Air Heater Channel Fitted with Delta Winglet Vortex Generator 被引量:1
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作者 Sompol Skullong Pongjet Promvonge 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第1期1-10,共10页
The paper presents an experimental study on the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators (DWs). The experiments are conducted by ... The paper presents an experimental study on the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators (DWs). The experiments are conducted by varying the airflow rate for Reynolds number in the range of 5000 to 24000 in the test section with a uniform heat-flux applied on the upper channel wall. Firstly, the DW pairs are mounted only at the entrance of the lower wall of the test channel (called DW-E) to create multiple vortex flows at the entry. The effect of two transverse pitches (Re= Pt/H= 1 and 2) at three attack angles (a= 30°, 45° and 60°) of the DW-E with its relative height, b/H= 0.5 (half height of channel) is examined. Secondly, the 30° DWs with three different relative heights (blH = 0.3, 0.4 and 0.5) are placed on the upper wall only (absorber plate, called DW-A) of the test channel. The experimental result reveals that in the first case, the 60° DW-E at Rp = 1 provides the highest heat transfer and friction factor while the 30° DW-E at Rp = 1 performs overall better than the others. In the second case, the 30° DW-A at b/H= 0.5 yields the highest heat transfer and friction factor but the best thermal performance is found at b/H = 0.4. 展开更多
关键词 heat transfer intensification delta-winglet Reynolds number friction factor solar air heater flat channel
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Temperature Profiles in the Flow Channel of a Natural Convection Solar Air Heater
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作者 K.S. Ong B.T. Tan 《Journal of Energy and Power Engineering》 2011年第2期129-134,共6页
An experimental investigation was conducted to measure the temperature variation across the flow channel and to determine the performance of a natural convection solar air heater at various tilt angles from 15, 30 and... An experimental investigation was conducted to measure the temperature variation across the flow channel and to determine the performance of a natural convection solar air heater at various tilt angles from 15, 30 and 45°. The results of the temperature profile across the air gap showed that heat transfer from the absorber plate to the air stream was mainly by convection. At a particular section, mean air temperature could be calculated from the arithmetic mean of the temperature profile across the air gap to within ± 2 ℃. The axial air temperature distribution was non linear and did not increase much beyond 1 m of collector length. It tended to decrease towards the end of the collector. Overall glass, absorber plate and mean air temperatures over the entire length of the solar air heater could be determined by averaging the mean axial temperatures to within ± 2 ℃. The heater performed better as inclination increased. 展开更多
关键词 Solar air heater natural convection inclination effects temperature profile across air gap axial temperature distribution.
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Thermal Performance Study of Three Models of Solar Air Heater Made of Concrete
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作者 Messaouda Anis Kerkeni Chakib 《Journal of Environmental Science and Engineering(B)》 2013年第9期559-564,共6页
An experimental study was conducted on three models of solar collectors having an absorber made of concrete designed and built in the TPL (Thermal Process Laboratory). A sequence of tests was performed on these mode... An experimental study was conducted on three models of solar collectors having an absorber made of concrete designed and built in the TPL (Thermal Process Laboratory). A sequence of tests was performed on these models for the two air circulation models (forced and natural) in order to compare their thermal performance. The results are presented in terms of useful energy, stored energy and thermal efficiency of each model. 展开更多
关键词 Solar energy heat transfer natural convection forced convection solar collector made of concrete.
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