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将曲柄连杆单轴跟踪技术与CPC(复合抛物面聚光器)热管真空管太阳集热器集成,研制一套聚光比为2.3的跟踪式CPC集热器。基于Trace Pro光学软件模拟其跟踪模式下的聚光行为,并对不同跟踪模式下的集热特性进行实验研究。模拟得到横向投影角θt是影响CPC集热器光学性能的主要因素,θt为-23.5°~23.5°时,入射角修正因子(IAM)达到0.95~1.14;跟踪可有效缩小θt,将光学效率提高30%以上;采用三点式间歇跟踪即可获得高于60%的光学效率。实测集热效率分布和光学效率模拟值趋势一致,系统跟踪时高效集热时间为固定式的2.7倍,平均集热效率达到固定式的2.1倍。集热效率归一化线性良好,效率截距为52%,和光学效率模拟值偏差小于12%,佐证了模拟分析结果。
Crankshaft connecting rod mono-axis tracking technology and CPC (composite parabolic concentrator) heat pipe vacuum tube solar collectors to develop a concentrating ratio of 2.3 tracking CPC collector. Based on TracePro optical software, the light collecting behavior under the tracking mode was simulated, and the heat collecting characteristics under different tracking modes were experimentally studied. The simulation results show that the horizontal projection angle θt is the main factor affecting the optical performance of CPC heat collector. When θt is -23.5 ° ~ 23.5 °, the incident angle correction factor (IAM) reaches 0.95 ~ 1.14. The tracking can effectively reduce θt and improve the optical efficiency More than 30%; using three-point intermittent tracking can get more than 60% optical efficiency. The measured thermal efficiency distribution and the optical efficiency of the simulation values of the same trend, the system tracking time of efficient collector is 2.7 times the fixed, the average collector efficiency of fixed 2.1 times. The linearization of heat collection efficiency was normalized with an efficiency intercept of 52% and a deviation of less than 12% from the simulated value of optical efficiency, which corroborates the simulation results.