ESTIMATION OF SOLAR IRRADIANCE ON TILTED SURFACE FACING SOUTH IN ČAČAK, SERBIA

Abstract

The performance of solar systems is affected by the value of its tilt angle with respect to the horizontal surface, where the variation of tilt angle changes the amount of incident solar radiation. In this paper, hourly extraterrestrial solar irradiance, beam, diffuse and solar radiation on the tilted surface is modeled and calculated based on measured data of the global solar radiation on horizontal surfaces for Čačak (lat 43.87° N, long 20.33° E). The computer program has been done to calculate the hourly solar irradiance for calculating different tilt angle setups. The calculation was based on experimental data of global solar radiation on the horizontal surface for the average day of April, July and September. Important trends of solar radiation on tilt surfaces as a function of time and the effect of surface tilt angles of the PV panel for achieving maximum collection of solar radiation in Čačak are presented. Most of the parameters modeled in this paper are essential in the design and study of solar energy conversion systems.