REFINEMENT TO THE SOLAR RADIATION OF CSWD IN SHANGHAI OF CHINA WITH CONSIDERATION OF CLOUD RATIO

Abstract

Among four sets of Standard Year Weather Data (CSWD, CTYW, IWEC, SWERA) in China, only CSWD measures solar radiation. We show that the cloud ratios of CSWD in May, June, and July, are significantly smaller than the other three sets and measured solar radiation in Shanghai. In addition, the cloud ratios of CSWD in May, June and July are outside the bounds of the sky condition classification, thus not physically realistic. In order to obtain a higher accuracy of the solar radiation for air conditioning load calculations, we refine the cloud ratio of CSWD that yields realistic values of cloud ratio.