Hourly global solar radiation data measured on a horizontal surface in Amman, Jordan, available for the period 1983–1987, have been studied and analysed. Average values of daily, monthly and yearly global radiation, as well as maximum and minimum radiation values, were determined.

maximum global radiationPractical/ sunlight/ hourly global solar radiationlinear correlations

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Quoted from:[1]Characteristic distribution of global solar radiation for Amman, Jordan[J]. Solar & Wind Technology, 1990, 7(2-3):261-266.

https://www.sci-hub.ren/10.1016/0741-983x(90)90095-j

ABSTRACT

INTRODUCTION

The objective of the present work is the determination of the solar radiation characteristics for the city of Amman by using actual measurements of the global solar radiation. To achieve this goal the hourly measured solar radiation data available for the 1983 1987 period were used to calculate the average values, as well as the maximum and minimum values of daily, monthly and yearly global radiation. The calculated monthly mean daily values of global radiation and the measured hours of daily bright sunshine for Amman were used to derive linear regression correlations for estimating average, maximum and minimum monthly mean daily global radiation.

Alsaad suggested the following relation to estimate the global radiation for Amman, Jordan:
$$𝐻/𝐻0 = 0.174 + 0.615 𝑆/𝑆0 .$$

CONCLUSIONS

The results of the present work indicate that Amman has high values of global solar radiation during most months of the year. The average, maximum and minimum solar radiation data obtained can be used for the design and performance evaluation of solar energy devices in Jordan. Three regression correlations were developed to predict the average, maximum and minimum global radiation from the knowledge of the recorded sunshine hours. The accuracy of the obtained correlations was tested using measured solar radiation data. It was found that the average error incurred in predicting global radiation ranged from 0.1 to 0.3% which indicate excellent agreement between predicated and measured values. Each of the maximum and minimum monthly mean daily radiation was related to the average global radiation through linear equation. Such equations permit direct estimation of the maximum and minimum global radiation from the knowledge of average radiation.

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M. A. ALSAAD (2021). Alsaad model, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/368f2079-6e7e-470b-b8aa-13afc6b5cc7f

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