不同方位角上太阳能集热器最佳倾角的确定

综合考虑太阳辐射量和热负荷的变化,以福州地区为例,分别以年最大得热量和年需最小辅助加热量为目标,计算得到不同方位角所对应的集热器最佳倾角.结果表明,正南朝向下,相较于以年最大得热量为目标确定的集热器最佳倾角,以年需最小辅助加热量为目标确定的集热器最佳倾角可节约11.7%的辅助加热量.方位角对集热器最佳倾角也有较大影响.当方位角的绝对值较大时,应采用较小的集热器倾角.

The optimum tilt angles of solar collectors for different azimuth angles

Considering the changes of solar radiation and heating load and taking Fuzhou region for instance, the optimum collector tilt angles at different azimuth angles were calculated based on the objectives of maximum annual heat gain and minimum annual auxiliary heating respectively. The results show that, when the collector facing due south, the optimum tilt angle obtained based on minimum annual auxiliary heating could reduce the heating supplement by 12.6%, compared to the angle obtained based on maximum annual heat gain. Azimuth angle has a great influence on the optimum collector tilt angle. A smaller collector tilt angle should be adopted when the absolute value of azimuth angle is lager.