CPC不同方位辐射量及最佳倾角计算

CALCULATION OF CPC RADIATION AND OPTIMAL INCLINATION IN DIFFERENT DIRECTIONS

针对复合抛物面集热器(CPC)接收辐射量和集热性能受方位角和倾角影响的关系。分别分析了CPC不同放置方式下接收到的太阳辐射及对应最佳倾角,得到方位角与最佳倾角的关系,结合不同地区研究CPC最大太阳辐射量与倾角、方位角之间的关系。结果发现,大多数地区全年最佳倾角位于当地纬度附近,相差5°以内,侧重冬半年使用应采用较大的倾角,夏半年采用较小的倾角;正南方向为最佳方位,太阳辐射随着方位角增加而降低,当CPC偏离正南方向时,应降低倾角来减小太阳辐射损失。对正南朝向下不同倾角CPC倾斜面接收辐射量进行了测试,验证了理论计算的准确性。并对不同倾角CPC的集热性能进行研究,最佳倾角的确定可使瞬时热效率提高3.9%以上,在CPC的应用中可以提高实际应用价值。

Aiming at the relationship between the azimuth and inclination of the radiation received by the compound parabolic collector(CPC)and the heat collection performance.Calculated the amount of CPC received radiation and the optimal inclination at different directions,in different seasons,the influence of azimuth angle on the optimal inclination angle is analyzed,the relationship between the maximum radiation of CPC and its installation inclination and azimuth is discussed in combination with different regions.Turn out,in most areas,the best inclination in the whole year is near the local latitude,within 5°,a larger inclination angle should be used in the winter and a smaller inclination angle in summer;the south is the best direction,solar radiation decreases with increasing azimuth,when CPC deviates from the true south direction,the inclination angle should be reduced to reduce solar radiation loss.Tested the amount of radiation received by the CPC inclined plane with different inclination angles facing south,the accuracy of theoretical calculation is verified.And studied the heat collection performance of CPC with different inclination angles,the instantaneous thermal efficiency can be increased by more than 3.9%after the optimum inclination angle is determined,and the practical application value can be improved in the CPC application.