跟踪式CPC热管真空管太阳能集热器性能研究

Performance investigation on a sun-tracking CPC heat pipe evacuated tube solar collector

将复合抛物面聚光器(CPC)及跟踪技术通过简单的曲柄连杆机构与热管真空管集热器集成,研制了1套聚光比为2.3的跟踪式CPC热管真空管太阳能集热器。对该集热器在固定、间歇和连续跟踪3种模式下进行了集热性能测试,分析了跟踪方式对延长集热时间和改善集热效率的影响,对集热效率进行了拟合和归一化分析。研究结果表明:跟踪模式下集热器高效集热时间为6h,是固定模式的2倍;采用间歇跟踪即可有效提高集热性能;跟踪模式下的日平均集热效率达到45%,比固定式提高约16%。集热效率归一化拟合回归系数均大于0.936,拟合过程可信。

A sun-tracking CPC(compound parabolic concentrator)heat pipe evacuated tube solar collector(ST-CPC-HPET-SC)with a concentration ratio of 2.3was set up,which integrated the CPC and sun-tracking technology into heat pipe evacuated tube collector through a simple cranklink mechanism.The heat collection performance of this ST-CPC-HPET-SC was experimentally tested under conditions of fixed,intermittent-tracking and continuous-tracking,respectively.The effect of tracking mode on heat collection time and efficiency was analyzed.Moreover,the heat efficiency was fitted and normalized,and its influencing factors were analyzed.The results showed that,the sun-tracking CPCs could improve thermal performance of the heat collector effectively,among which the simple intermittent type was preferred.Efficient working time of the ST-CPCHPET-SC under tracking modes was 6hours,2times of that under the fixed condition.The daily average heat efficiency of the ST-CPC-HPET-SC under tracking conditions was 45%,about 16%higher than that under the fixed condition.The normalized fitting regression coefficients were both larger than 0.936,so the fitting process was reliable.Finally,the efficiency intercepts and heat loss coefficients of the ST-CPC-HPET-SC were obtained.This novel ST-CPC-HPET-SC can be applied in solar medium-temperature thermal utilization fields.