Thermal performance of an evacuated tube solar air heater inserted with copper tubes

November 22, 2025

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This research aims to evaluate the performance of a solar air heater with copper tubes regarding thermal efficiency and heat gain.
Experimental analysis conducted at airflow rates of 10 to 50 kg/h.
Effects of copper tube configuration on outlet temperature, thermal efficiency, heat gain, and pressure drop were assessed.
Maximum output temperature reached 110.1 °C at 10 kg/h.
At 50 kg/h, the highest heat gain recorded was 663.8 W.
Thermal efficiency increased with airflow rate, reaching 54.2% at 50 kg/h.
Exergy efficiency trends mirrored solar radiation trends, decreasing with increased airflow.

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Evaluates thermal efficiency and heat gain in a solar air heater, suggesting energy-efficient solutions.

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Adaikalasamy et al. (2025) studied this question.

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