Page 72 - Design of Solar Thermal Power Plants

2.5 DISTRIBUTION OF THE SOLAR RESOURCE IN SEVERAL 63

bottom level in December. Among the four seasons, summer (Junee
August) enjoys the most solar radiation, whereas winter (Decembere
February) enjoys the least; solar radiation in spring (MarcheMay) is
slightly less than that of summer, and solar radiation in autumn falls
between the winter and summer levels.

2.5.1.3 Sunshine Duration of Beijing
The annual mean sunshine duration in Beijing falls in the range of
2000e2800 h; in most of the area, the value is around 2600 h (refer to
Table 2.3). Annual sunshine distribution is consistent with solar radiation
distribution; the maximum value is obtained in Badaling County and
Gubeikou at over 2800 h, whereas the minimum value is obtained in
Xiayunling with sunshine duration of 2063 h.

TABLE 2.3 Annual Sunshine Duration of Beijing (h)
Area Hours
Haidian 2620
Chaoyang 2554.8
Shijingshan 2473.3
Tongxian 2722.7
Changping 2641.4
Mentougou 2621.4
Zhaitang 2594.1
Santai 2733.6
Daxing 2769.3
Shunyi 2792.3
Fangshan 2606
Xiayunling 2063.2
Badaling 2813.2
Foye Ding 2491.3
Pinggu 2711.3
Madaoliang 2690.7
Tanghekou 2812.4
Gubeikou 2822.9
Huairou 2731.5
Miyun 2788