Thermal Efficiency of return flow solar air heater

Abstract

In this work the thermal efficiency of a return flow SAH having roughened absorber in the form of V shaped ribs is determined. The effect of roughness parameters like angle of attack (α), and relative roughness height (e/D) and operating parameters like intensity of solar radiation (I) and mass flow rate (m) are deeply examined. Analytical approach while assuming the steady state condition was used to inspect the performance. Thermal efficiency is found to increase while increasing the mass flow rate, it is observed that at relative roughness height e/D=0.036, angle of attack α=60⁰ maximum enhancement is achieved.

Key words: Thermal efficiency, Angle of attack, Artificial roughness, Solar air heater SAH

Cite this Article

Vikram Singh, Abhishek Kumar Goel. Thermal Efficiency of Return Flow Solar Air Heater. Journal of Refrigeration, Air Conditioning, Heating and Ventilation. 2017; 4(3): 33–38p.