Enhancing Thermal Performance of a Parabolic Trough Collector with Inserting Longitudinal Fins in the Down Half of the R
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https://doi.org/10.1007/s11630-020-1256-8
Article ID: 1003-2169(2020)00-0000-00
Enhancing Thermal Performance of a Parabolic Trough Collector with Inserting Longitudinal Fins in the Down Half of the Receiver Tube LAARABA Adel1*, MEBARKI Ghazali2 1. Department of physics, University of Batna, Batna 05000, Algeria 2. Faculty of Technology, LESEI Laboratory, Department of Mechanical Engineering, University of Batna, Batna 05000, Algeria © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Heat transfer in a finned absorber of a parabolic trough collector was studied numerically. The main aim of this work was to study the effect of attached fins on the enhancement of the thermal performance of a parabolic trough collector. The values of the fin’s length varied from 0 to 20 mm; their thicknesses varied from 0 to 8 mm and their number was 5. The parameters used in the current study are: the thermal and dynamic field, friction coefficient, Nusselt number, the thermal efficiency and thermal enhancement index. Obtained results show that inclusion of fins to the lower half of the absorber tube can enhance the heat transfer between the absorber tube and working fluid. The increase of the fin’s length increases the friction factor, Nusselt number and thermal efficiency, and the increase of fin’s thickness also increases the previous parameters. Starting the value 6 mm of thickness, its effect remains the same, but thickness is less effective than length. The values 15 mm of length and 6 mm of thickness are selected as optimal values. Results show that the inclusion of the fins enhances the thermal performance of the parabolic collector by 8.45%.
Keywords: solar energy, Nusselt number, thermal efficiency, parabolic trough collector, forced convection
1. Introduction Solar energy is one of the most important sources of renewable energy, the cleanest and most environmentally friendly; it comes from the light and heat of the sun. These techniques include: solar thermal energy in one of the direct heating methods or the mechanical conversion of the energy of the movement or electrical energy. One of the most important ways of converting solar energy is the parabolic collectors, which convert solar radiation into thermal energy used to manage a steam turbine to produce electricity. In order to improve the performance of parabolic trough collector, researchers have proposed several techniques, most of which are Received: May 07, 2019
AE: SUN Jie
expensive. The technique that is not expensive proposed by many researchers, is to include longitudinal fins to the inner surface of the absorber tube of a parabolic trough solar collector. Alhassan Salami Tijani et al. [1] have numerically simulated the convective and radiation thermal losses in a parabolic trough collector and studied the effect of wind speed on its losses. Results show that the wind speed does not have a great effect on thermal losses; convective losses and radiation losses account for 64
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