An experimental performance analysis of a double pass solar air heater (DPSAH) is performed with threedifferent configurations under climatic conditions of Pakistan. These configurations include, without fins andwithout phase change material (PCM), with fins but without PCM, with fins and PCM in circular tubes withfins. Paraffin wax of melting point 56˚C has been used as PCM. Data were collected from 9am to 10pm onhourly basis. Important parameters such as solar irradiance, flow rate of air through DPSAH, temperatures atdifferent points of DPSAH, thermal efficiency, heat input, heat output, heat stored, The average efficiency ofthird configuration (C3) was 56.1% and 30.8% higher than first configuration (C1) and second configuration(C2), respectively. Based on the detailed experimental study it was concluded that C3 is the most efficientconfiguration for double pass SAH.
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