Sunil Chamoli and Narendra Thakur

pp. 201 - 208

Abstract

This paper presents results of a study of the performance of solar air heaters with V down perforated baffles as
roughness on the air flow side of the absorber plate. Investigations have been carried out using a mathematical model to study
the effects of ambient conditions, operating and design parameters on effective efficiency of such air heaters. The thermal
and effective efficiencies differ only marginally at lower flow rates. With an increase in the flow rate, the difference between
the thermal and effective efficiencies increases because of the increase in the pumping power. The results of the study are
presented in the form of plots to show the effect of ambient, design and operating conditions on thermal and effective
efficiency.

Keywords

• thermal efficiency
• effective efficiency
• solar air heater
• perforated baffles
• insolation