Thermal performance of artificially roughened solar air heater with booster mirror

PAWAR MAHESH RAJENDRA

Abstract


Solar air heaters are one of the simplest and cost effective solar energy utilization systems

for various drying applications. The thermal efficiency of solar air heaters is found to be

low due to low heat transfer coefficient on the air side. Attempts have been made to

enhance the heat transfer rate from the absorber plate to air by using different roughness

elements. Enhancement of heat transfer coefficient is achieved by providing artificial

roughness, always goes with an increment of pressure drop and more pumping power is

required. So, there is a need to optimize the system parameters to maximize heat transfer,

while keeping the friction losses as low as possible.


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