Adjustment factors for the ASHRAE clear-sky model based on solar-radiation measurements in Riyadh

Sami A. Al-Sanea, M. F. Zedan and Saleh A. Al-Ajlan

Applied Energy, 2004, vol. 79, issue 2, 215-237

Abstract: The solar-radiation variation over horizontal surfaces calculated by the ASHRAE clear-sky model is compared with measurements for Riyadh, Saudi Arabia. Both model results and measurements are averaged on an hourly basis for all days in each month of the year to get a monthly-averaged hourly variation of the solar flux. The measured data are further averaged over the years 1996-2000. The ASHRAE model implemented utilizes the standard values of the coefficients proposed in the original model. Calculations are also made with a different set of coefficients proposed in the literature. The results show that the ASHRAE model calculations generally over-predict the measured data particularly for the months of October --> May. A daily total solar-flux is obtained by integrating the hourly distribution. Based on the daily total flux, a factor [Phi] (

Keywords: Solar; radiation; in; Riyadh; ASHRAE; clear-sky; model (search for similar items in EconPapers)
Date: 2004
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Citations: View citations in EconPapers (11)

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