外部反射镜增强聚热式太阳能产蒸汽研究

Research on solar steam generation with enhanced heat collection by external reflector

为研究外部反射镜对太阳能聚热集能产蒸汽的影响,计算了不同季节、方位角、反射镜倾角所接收的太阳辐射能,实验研究了反射聚热产蒸汽装置性能特性。结果表明:反射镜最佳方位角,春冬季为-90°;夏秋季以全段实验时间考虑为180°;反射镜最佳倾角,春冬季应小于25°;夏秋季应大于25°。典型晴天条件下(太阳辐照平均850 W×m^-2),在日有效工作时间(10:00~16:00)内,镜面增强聚热后装置单位面积有用能增加28.5%。单位时间内蒸汽发生速率由15.68提高至27.79 mL×min^-1,平均蒸汽产率提升77.23%。当太阳辐照度达到1000 W×m^-2以上时,增设外部反射镜时装置最高产蒸汽速率是未增设时的2.5倍,日产蒸汽量从8.18提高到12.6 kg。

In order to study the effects of extra external reflector on solar steam generation,solar energy received under different seasons,azimuth angles and inclination angles of the reflector are calculated.The results show that the optimized azimuth angle of the mirror is-90°in spring and winter,and 180°in summer and autumn.The optimized inclination angle of the mirror is less than 25°in spring and winter,and greater than 25°in summer and autumn.The useful energy per unit area at 10:00~16:00 increases by 28.5%with the mirror enhanced heat collection in typical sunny days(the average solar irradiation is 850 W×m^-2).The steam generation rate increases from 15.68 mL×min^-1 to 27.79 mL×min^-1 per unit time,and the average steam yield increases by 77.23%.When the solar irradiance reaches more than 1000 W×m^-2,the maximum steam rate of the device with the external reflector is 2.5 times higher than that without the external reflector.The daily steam capacity increases from 8.18 kg to 12.6 kg.