Estimation of horizontal diffuse solar radiation with measured daily data in China

Chen Rensheng, Kang Ersi, Yang Jianping, Lu Shihua, Zhao Wenzhi and Ding Yongjian

Renewable Energy, 2004, vol. 29, issue 5, 717-726

Abstract: Three most widely used diffuse radiation models are calibrated using the daily data between January 1 1994 and December 31 1998 from 16 stations all over China. The second-degree polynomial relationship between RD/RG and n/N (Iqbal model) is suitable for diffuse radiation estimation in China. The averaged correlation coefficient R2 is 0.84 and the maximum value is 0.93 at the 16 stations, and the Iqbal model works better in the eastern part of China than in the west. The A.A. El-Sebaii model could not be used to estimate diffused radiation accurately in China, with an averaged R2=0.47. The Liu and Jordan model could also be used for diffuse radiation estimation in China, and the averaged value of R2 and parameter X0 is 0.81 and 0.233, respectively. There is an evident linear relationship among the parameters X0, a and b of the Liu and Jordan model.

Keywords: Diffuse radiation; Global radiation; Clearness index; Sunshine hours (search for similar items in EconPapers)
Date: 2004
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:29:y:2004:i:5:p:717-726

DOI: 10.1016/j.renene.2003.09.012

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