安装角度对复合抛物面聚光集热器接收太阳辐射影响的数值模拟

NUMERICAL MODELING OF EFFECT OF INSTALLATION ANGLE OF COMPOUND PARABOLIC CONCENTRATING COLLECTOR ON RECEIVING SOLAR RADIATION

建模分析昆明地区不同入射半角的复合抛物面聚光集热器(CPC)在全年不同朝向、不同倾角下的能量接收情况。结果表明:CPC的聚光比与入射半角呈正相关,入射半角的大小限制了其光线接收角的范围进而影响能量的接收;正南朝向为最佳朝向,正南向安装时最佳倾角随季节变化而变化,正西向倾角越大能量越小;正南向在冬半年适宜进行高倾角安装,在12月份倾角为50°、入射半角为60°时,CPC接收太阳辐射量最大为13.27 MJ;在夏半年适宜低倾角安装,在4月份最佳倾角为0°、入射半角为60°时,CPC接收太阳辐射量最大为15.99 MJ。为使CPC获得能量最佳,建议昆明地区全年固定朝向安装的CPC采用较大的入射半角,安装角度为20°~35°。

In this paper,the annual energy acceptance of the compound parabolic concentrator(CPC)with different incidence half angles in different directions and inclination angles in Kunming area is modeled and analyzed.The results show that the concentrating ratio of CPC is positively correlated with the incidence half-angle,the magnitude of the incidence half-angle limits the range of its light receiving angle and affects energy reception.The due south direction is the best direction,and the optimal inclination angle of this direction varies with season.The larger installation angle with due west direction is,the lesser energy reception is.Larger installation angle of due south direction is suitable in winter half year.When the inclination angle is 50 degree and the incidence half angle is 60 degree in December,the maximum solar energy reception is 13.27 MJ.It is suitable with low inclination angle in summer half year.When the inclination angle is 0 degree and the incidence half angle is 60 degree in April,the maximum solar energy reception is 15.99 MJ.In order to get the best efficiency of CPC,it is suggested that fixed orientation of CPC installed in Kunming area should adopt a high incidence half angle,and the installation angle range is from 20 to 35 degree.