DESIGN AND PERFORMANCE EVALUATION OF AIR SOLAR CHANNELS WITH DIVERSE BAFFLE STRUCTURES

Volumen 10, Ausgabe 3, 2018, pp. 225-249

DOI: 10.1615/ComputThermalScien.2018025026

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Younes Menni
Unite of Research on Materials and Renewable Energies - URMER - Department of Physics, Faculty of Sciences, Abou Bekr Belkaid University, BP 119-13000-Tlemcen, Algeria

Ahmed Azzi
Unit of Research on Materials and Renewable Energies – URMER, Abou Bekr Belkaid University, BP 119-13000-Tlemcen, Algeria; Department of Mechanical Engineering, Faculty of Technology, Abou Bekr Belkaid University, BP 230-13000-Tlemcen, Algeria

ABSTRAKT

We conducted a detailed analysis of the baffle design and its impact on the convective phenomenon of heat transfer inside a solar air channel. Several differently shaped baffles [i.e., arc, cascaded, corrugated, diamond, rectangular (simple), trapezoidal, triangular, V-downstream, V-upstream, double V, and Z-shaped] with the same flow conditions were compared in a staggered manner. Our purpose is to explore the effect of these baffle geometries on the steady turbulent forced-convection flow behaviors inside a two-dimensional horizontal rectangular cross section channel. The thermo-aeraulic aspects are presented for Reynolds numbers based on the aeraulic diameter of the channel ranging from 12 × 10³ to 32 × 10³. The governing flow equations with the thermo-aerodynamic boundary conditions were solved by the finite volume method using the commercial CFD software FLUENT. The result analysis shows that the V-upstream–type baffle is the best design, which significantly decreases the skin friction loss, giving thus an augmentation in the thermal enhancement factor from 11.855 to 25.397% compared to the simple baffle.

SCHLÜSSELWÖRTER: aerodynamics, baffle and fin, finite volume method, solar air channel, CFD

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