Determining global solar radiation incident on tilted surfaces with different tilt angles at the department of physics Makerere University
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Date
2013-12
Authors
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Journal ISSN
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Publisher
Kampala International University.College of Education
Abstract
Solar radiation data at horizontal level, tilted surfaces and in the atmosphere is an
important feature in solar energy applications such as photovoltaic systems for
electricity generation, solar collectors for heating and passive solar devices. This study
presents an investigation of the dependence of global solar radiation incident on a tilted
surface on some meteorological parameters for different tilt angles based on measured
meteorological data of sunshine, relative humidity and temperature at Makerere
University. Empirical models relating global solar radiation on tilted surfaces and
meteorological data were formulated using data of six months. The proposed empirical
model for the estimation of daily global solar radiation on the tilted surfaces assessment
based on the statistical analysis with the Mean Bias and Root Mean Square difference
that is in good agreement with the measured data on a tilted surface is
= -0.2614 - 0.2386(RH) + 1.5822 (Tmax) + 0.1065 (Tmax) Hap 65 Tmin
In comparison with the other tilt angles the model yielded a RMSE of 4.2654, with a low
(poor) correlation coefficient of 0.3743 at a 95% confidence interval and MBE of
1.5801.
Analysis of data for a period of 3 years, towards the verification of Akoba's (2009)
model, the study recommends a new model
= -0.9227 - 0.1405 (!.::.) - 0.0335(RH) + 3.2826 (Tmax) that capitulated a RMSE of Hap N 65
2.5985, with a correlation coefficient of 0.8863 at a 95% confidence interval and MBE
of 2.3391.
Description
Research dissertation submitted to the College of Higher Degrees and Research in partial fulfilment of the requirements for the award of a master of Science (physics) degree of Kampala International University
Keywords
Solar, Radiation, Incident, Department, Physics