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Experimental study on enhancement in heat transfer for solar air heater using multi trapezoidal rib roughness on the absorber plate
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DOI：10.1016/j.ijthermalsci.2026.111210.png)
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Abstract
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• Thermohydraulic performance of solar air heater ducts with trapezoidal ribs are analysed experimentally. • Artificial roughness of multi trapezoidal shapes with gaps the limbs are fabricated for enhanced heat transfer. • Heat transfer effect is strongest at width of the gap (g/e = 1) and high flow speeds. • Current study reveals enhanced heat transfer with manageable flow resistance. • Provide insights in fabrication of advanced heat exchanger surfaces and high efficiency solar thermal systems.
Keywords:
Solar air heater
Gap
Trapezoidal ribs
Heat transfer enhancement
Roughness
Thermohydraulic performance parameter
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