Numerical investigation of thermal performance in a solar air heater using triangular fins

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Chinese explanation / 中文解读

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Original abstract

This paper presents a study on improving the heat transfer of a flat solar collector system for air heating using a triangular fin attached on the bottom face of an absorber plate in a solar collector using a numerical simulation.A three-dimensional numerical emulation was attained utilizing a Computer simulation of fluid flow via the CFD process established on a k-ε disruption representative for renormalized array to predict the heat transfer improvement of a flat solar collector system for air heating.The numerical results acquired into a constant thermal flux 1000 W/m² and the range of Reynolds number from 2349 to 9311 were validated by comparing them with a practical data obtainable in the scientific published works.The numerical outcomes revealed that the use of triangular fins can effectively influence the thermal boundary layer by inducing periodic flow recirculation behind the fins.The numerical results also showed that at a Reynolds number of 5000 and a maximum Nusselt number of 26.0 can be reached using 10 mm fins, but applying 15 mm fins resulted in a significant increase in friction.Consequently, the thermo-hydraulic coefficient of performance (THPF) for 10 mm fins was found to be greater than 0.88 for all Reynolds numbers, making it a better choice for a solar air heating system.

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