A REVIEW ON DIFFERENT TECHNIQUES USED FOR IMPROVEMENT THE PERFORMANCE OF DOUBLE PASS SOLAR AIR HEATER
DOI:
https://doi.org/10.52262/42d3aj64Keywords:
Solar air heater, Perforated plate, ObstaclesAbstract
Energy is the cornerstone of life and a critical driver of national growth, modernization, and economic development. As the global shift toward renewable energy intensifies to address environmental concerns and rising energy demands, solar air heaters (SAHs) have emerged as key devices for space heating and thermal applications. However, their low thermal efficiency remains a major limitation. This paper reviews enhancement techniques to improve SAH performance, including the use of extended surfaces, corrugated and perforated absorber plates, artificial roughness, and jet impingement. Studies show that integrating fins and baffles significantly boosts thermal efficiency in both single-pass and double-pass configurations. Corrugated plates also enhance heat transfer, while artificial roughness—especially with non-circular, rectangular, and equilateral ribs—improves thermal-hydraulic performance, particularly when combined with jet impingement.
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