Yearly optimum tilt angle and its mean daily solar radiationFor every month at some regions of China南宁广州拉萨武汉成都上海西安银川乌鲁木齐哈尔滨()纬度22.8223.1329.7030.6330.6731.1734.3038.4843.7845.68o p t17.223324152726373843(MJ / m2 d)1月9.3011.8627.2910.56.5911.5810.6918.5911.9613.522月8.429.4926.1811.107.6912.0711.6420.3815.6416.623月8.459.0224.7911.5910.8013.0112.9419.7016.8018
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