A Review Heat Transfer Enhancement in Solar Air Heater Duct with V-Down Perforated Baffles as Roughness Elements on Absorber Plate

Mechanical Engineering

Solar air heaters are used to capture heat from solar radiation, give it to the working fluid and that hot fluid can be used in various applications. This article aims to present a review of the literature dealing with improvement methods, design configurations and applications of different types of solar air heaters (SAH). Different investigations have been made on SAHs either experimental or theoretical in order to improve their performance. Also it is found that to improve both the heat transfer and thermo-hydraulic performance of SAH, artificially roughened absorbers are used. Using artificial roughness, the results showed good enhancement of both Nusselt number and friction coefficient for a wide range of Reynolds number. As a result of these improvements, SAHs became more popular in more applications, with a good reduction in fuel consumption and costs of installation and operation.

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