Energizing Kowloon East Office
122 Hoi Bun Road, Kwun Tong, Kowloon, Hong Kong
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Solar Radiation in Hong Kong
During a year, the longest sunshine month is July and the shortest is January.
Solar radiation during the second half year is much higher than that of the first half year in Hong Kong. As for global horizontal radiation, the average hourly quantity range between the twelve months is range between 277Wh/sq.m (JAN) – 440Wh/sq.m (JUL) ; and as for direct normal radiation, the highest average hourly quantity can be as much as 324Wh/sq.m (OCT), while the lowest can be while the lowest can be 122Wh/sq.m(APR); While, the data of diffuse radiation in Hong Kong during twelve months is relatively uniform between 165Wh/sq.m (JAN) and 214Wh/(SEP). Thus, 165Wh/sq.m (JAN) and 214Wh/(SEP). Thus, we can take some measures on windows and building envelopes to avoid overheat during summer as well to make better use of solar radiation overheat during summer.
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Wind in Hong Kong
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Sun shading & Daylight Hours in Hong Kong
The annual prevailing wind direction in Hong Kong is east orientation, and the average monthly wind direction of all the twelve months concentrate between south and east orientations.
The annual average wind speed of Hong Kong area is about 3.0m/s.
From the picture we know the best orientation of Hong Kong is 175° and the worst orientation is85°.
The solar altitude is 84.2° in summer and 43.9° in winter.
Except for the summer time (June, July and August), the sun will be almost always in the south orientation.
While, during the three months June, July and August, the sun position will be in the north orientation.
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Stereographic diagram/Best orientation in Hong Kong
* Images source: Climate Consultant 5.4 & Ecotect Analysis.