Estimation and Analysis of Solar Radiation on Horizontal and Inclined Surface for Baghdad City

Basheer Khaleel  Ahmed; Ghada Ghanim  Younis; Zakria  Abdalwahid

doi:10.24996/ijs.2021.62.11(SI).5

Authors

Basheer Khaleel Ahmed Department of New and Renewable Energies, College of Science , University of Mosul , Mosul , Iraq
Ghada Ghanim Younis Department of New and Renewable Energies, College of Science , University of Mosul , Mosul , Iraq
Zakria Abdalwahid Department of New and Renewable Energies, College of Science , University of Mosul , Mosul , Iraq

DOI:

https://doi.org/10.24996/ijs.2021.62.11(SI).5

Keywords:

Hourly solar radiation, solar altitude, solar azimuth angle, latitude, hour angle.

Abstract

The knowledge of the quantity of total solar radiation on horizontal and inclined surfaces is very important in the calculations of heating and cooling loads in architecture and in the design of certain solar energy applications such as photovoltaic and solar collectors. This paper estimates the total solar radiation on inclined surfaces in Baghdad (Lat. 33⁰ 21' N 44⁰ 14' long and 34m above MSL). A good model was used to estimate hourly total solar radiation on the inclined surface with different elevations (15⁰, 30⁰, 45⁰, 60⁰, 75⁰, 90⁰) from a horizontal surface. The mean hourly, daily and monthly variation of total solar radiation on horizontal and inclined surfaces were drawn and discussed. The optimum tilt angle over a period of a year was drawn and discussed. Linear regression equations correlating the mean hourly solar radiation on an inclined surface with mean hourly solar radiation on a horizontal surface was deduced with high correlation coefficient (0.98 – 0.99).