Review of the thermal efficiency of a tube-type solar air heaters

Poonam S. Pardeshi, Mikael Boulic, (Hennie) van Heerden, Andries, Robyn Phipps and Chris W. Cunningham

Renewable and Sustainable Energy Reviews, 2024, vol. 199, issue C

Abstract: There is an urgent need to provide evidence that solar air heaters can be effective for heating and ventilating low-rise buildings. Solar air heaters are devices that can convert solar energy into thermal energy for moderate and low-temperature applications such as space heating, preheating, crop drying, and the food industry. However, its efficiency is low due to the low heat transfer coefficient between the absorber and the flowing air, but they are also simple to construct and operate as there is low-risk leakage of heat transfer liquids. The two main types of solar air heaters are flat plate and tube-type. To date, flat plate solar air heaters have received the most attention in the research literature, but evidence of the efficiency gains from using tube-type solar air heaters is growing.

Keywords: Solar air heater; Tube type; Artificial roughness; Coating; Evacuated tubes; Multi-heat pipe array; Reflectors (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.rser.2024.114509

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