Abstract
In this study, the thermal performance of a parabolic dish concentrator with a rectangular-tubular cavity receiver was investigated. The thermal oil was used as the working fluid in the solar collector system. The performance of the cavity receiver was studied in two ways as a numerical modeling method and the artificial neural networks (ANNs) methodology. In this study, three variable parameters including the different tube diameters equal to 5, 10, 22, and 35 mm, and different cavity depths equal to 0.5a , 0.75a , 1a , 1.5a , and 2a were considered. The purpose of this study is the prediction of the thermal performance of the cavity receiver in different amounts of solar irradiance, the cavity depth, and the diameter of tube by the ANN methodology. The main benefit of the ANN method, in comparison with the numerical modeling method, is the calculation time and cost saving. The results reveal that the ANN method can accurately predict the thermal performance of the cavity receiver at different variable parameters of the cavity depth, and tube diameter with R 2 = 0.99 for each prediction.
Highlights
Today, the attention on the renewable energy technologies as an alternative technology for fossil fuel, has increased
Parabolic dish concentrator with cavity receiver is investigated as a high efficiency technology for converting solar radiation to the thermal energy that can be used for heating, cooking, and producing electricity or mechanical work
The results reveal that the artificial neural networks (ANNs) methodology is an effective and accurate approach for prediction of the performance system
Summary
The attention on the renewable energy technologies as an alternative technology for fossil fuel, has increased. This is because of advantages of the renewable energy such as clean, no pollution, reproducible, and environmental friendly manner [1]. Parabolic dish concentrator with cavity receiver is investigated as a high efficiency technology for converting solar radiation to the thermal energy that can be used for heating, cooking, and producing electricity or mechanical work. The concentrated solar irradiation is came into the cavity receiver hitted to the inner tube walls of the cavity receiver. The hit solar irradiation is absorbed by the working fluid that flows in the inner tube of the cavity receiver. The thermal losses of the cavity included (i) the reflection and emission of radiation from the inner surfaces of the cavity receiver outwards through its aperture, (ii) convection through the aperture of the cavity receiver, and (iii) the conduction heat losses through the walls and
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