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Title:	Determination Of Global Spectral Solar Irradiance From Broadband Solar Irradiance Measurement
Authors:	Yousef A. Eltbaakh (P48911)
Supervisor:	Mohad Hafidz, Dr.
Keywords:	Determination Of Global Spectral Solar Irradiance Global Spectral Solar Irradiance From Broadband Solar Irradiance Measurement Global Spectral Solar Irradiance Broadband Solar Irradiance Measurement Spectral irradiance--Measurement
Issue Date:	6-Jun-2013
Description:	Solar radiation represents the most important climatological factor behind a series of solar energy applications such as photovoltaic systems, solar thermal collectors and climate studies. Measurement of global spectral solar irradiance is not available in many instances, which is mainly due to the technical difficulties and prohibitive costs. The compact, comprehensive and cost competitive measurement experimental system is designed to study the spectral distribution of global solar irradiance in the interval of 400��1100 nm. The system consists of 13 LI-200SA pyranometers; 12 are equipped with different Schott glass, flat, circular, long pass filters whereas 13th LI-200SA pyranometer left without filter to measure the total solar radiation. The measurements were conducted continuously on the roof of the Physics Building, Universiti Kebangsaan Malaysia (2o 55`N, 101o 46`E) on a horizontal surface from November 1st, 2010 to October 30th, 2011 under different meteorological conditions. During the field experiment, global spectral solar irradiance measurements were carried out at two optical air masses; 1.5 and 1.15. Two different sets of modeling; SMARTS2 and SEDES2 are written in MATLAB to estimate the global spectral solar irradiance under cloudless and cloudy sky conditions respectively; also to study the impact of some atmospheric parameters on global spectral solar irradiance mainly, air mass, turbidity, water vapor thickness and the amount of ozone under cloudless sky conditions. The statistical error tests, NRMSE and NMBE have been used to test the accuracy of observed data. Under cloudless sky conditions, NRMSE and NMBE for the whole spectrum are varying from 5.4% to 10.4% and ��1.1% to 3.7% respectively, whereas under cloudy sky conditions NRMSE and NMBE are varying from 1.8% to 4.4% and ��2.4% to 2.9% respectively. According to the theoretical studies on the impact of some atmospheric parameters on global spectral solar irradiance, there is a clear impact of water vapor variation on spectral global solar irradiance in the visible and near infrared wavelengths between 0.55 and 1.0 m does not affect the spectral UV. The ozone variation impacts especially within the wavelength ranged between 0.3��0.35 m and 0.49��0.73 m and there is a strong absorption in monochromatic wavelength 0.469, 0.610 and 0.645 m. The effect of the turbidity parameter  becomes strong when  is bigger than to 0.20 (turbid) or more and this is due to the increment in the air pollution in the atmosphere. The measurement of solar radiation by using pyranometers equipped with filters is much less complicated, more compact, and lower cost. Despite their simplicity, the filter radiometers are able to provide results that are reasonably close to SMARTS2 and SEDES2 models. The comparison between observed and estimated values shows that all results are relatively in close agreement over the whole measured spectrum. Occasionally, differences or errors arise because of the limited number of wavelengths used for determining the measured spectrum. The distribution of spectral global solar irradiance for different air masses nearly has the same trend. This is because the atmospheric contents are approximately constant during the course of the measurements.,PhD
Pages:	226
Call Number:	GBQC911 .E453 2013
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

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