Experimental Validation Of Solar Radiation Models On Tilt Surfac
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Date
2017-05
Authors
Hammad, Fairouz
Nour, Mais
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Abstract
Solar energy is a sustainable and abundant energy resource. Estimating solar irradiation incident on inclined surfaces of various orientations is necessary to calculate the electric power generated by photovoltaic (PV) , to design solar systems and to evaluate their performance. Despite the fact that many meteorological/radiometric stations measure global and diffuse irradiation received on horizontal surfaces, the data on inclined surfaces are not available and are thus estimated with different models from those measured on horizontal surfaces. The lack of the data on inclined surfaces and due to the importance of this data in many different fields , also the importance of the optimum tilt angle which plays an important role in enhancing the energy collection of solar collectors , these reasons seek us to make our proposed work .
This study is applied in Palestine (Nablus city), which lies on the Latitude and Longitude 32.225 and 35.261 respectively. The goal can be achieved by Work on the modeling of solar radiation on tilt surfaces, in order to develop a database for the global solar radiation on horizontal and tilt surfaces together (we calculate the solar radiation on horizontal and tilt surfaces at the same time). By doing so, we obtained the data which is the amount of solar radiation on horizontal and tilt surfaces with different angles which lead to the optimum tilt angle. Also based on these findings (database and the mathematical equation), it provides information about the amount of solar radiation on a specific angle , more over a correlation between the global solar radiations on horizontal surface to the global solar radiation on tilt surface were obtained. Also it shows that, from global solar radiation measurements, we can quantify the various components solar radiation at the place considered. Then, it is possible to compute global irradiance or the effect of each irradiance component on a photovoltaic field of arbitrary orientation and inclination.
Through the results we obtained, the highest values for global solar radiation on tilt surfaces is at the angle of 30º , which is expected because the design is usually done at the latitude angle of the city ,
Optimum often to set
module tilt = latitude
as we know the latitude angle for Nablus Is 32.225˚ which is approximately equal the optimum tilt angle we obtained .
Finally , our project is the base for any other studies in the future in estimating the global solar radiation on tilt surfaces , it allows the researchers to do many studies using this data.