Aiming at improving the utilization of solar water heating system in cold areas, a non-tracking Compound Parabolic Concentrator (CPC) with a concentration rate of 3.9 has been proposed. The concentrator has the characteristics of operating stabilization, no mechanical movement and easy manufacturing. Based on the LightTools optical simulation software, the concentrating performance of this CPC at different incidence angle and deviation angle of the flat-plate receiver were simulated. A test system built in Hohhot at the latitude of 40°50' N to evaluate the characteristics of the device under sunny day and cloudy day. The results indicate that the overall ray's receiving rate of 55.2% is obtained at the incidence angle of 10 ° , the overall ray's receiving rate of 93.4% can be obtained at the deviation angle of 12 ° . On sunny day, the outlet temperature of thermal oil of the device at the title angle of 45 ° is lower than that of the device at the title angle of 55 ° by about 3 ℃. In the cloudy day, the thermal oil temperature curve of the device is steady. Analysis results show that the tracking accuracy required of the concentrator is lower. The CPC is suitable to provide heat energy for building in cold areas.%为提高北方寒冷地区太阳能建筑采暖系统的适用性,研制了一套聚光比为3.9的非跟踪式复合多曲面聚光器(CPC).该聚光器具有运行稳定、无运动部件及易于制造等特点.基于LightTools光学软件,分析不同入射偏角和接收体偏差角度条件下的聚光特性,并对安装于呼和浩特市(北纬40°50')的太阳能建筑采暖系统在晴天和多云气象条件下不同安装倾角聚光器的光热性能进行对比研究.结果表明:当入射偏角为10°时,聚光器的光线汇聚率为55.2%,当板式接收体偏差角度为12°时,聚光器的汇聚率仍为93.4%;晴天运行时,安装倾角为45°的聚光器出口导热油温度比正入射时低3℃左右,多云条件下,接收体内导热油温度变化曲线平缓,说明聚光器对跟踪精度要求低,适合于应用到建筑采暖系统中.
展开▼
