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Efficiency Enhancement of Two Pass Solar Collectors with Steel Matrix in the Region of Rajshahi, Bangladesh

Amit Roy1, Md. Emdadul Hoque1, Md. Saiful Islam1, Md. Rabiul Islam Sarker1 and Barun Kumar Das2

1. Mechanical Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh

2. School of Engineering, Edith Cowan University, Joondalup WA 6027, Australia


Abstract:

This paper depicts the experimental analysis to investigate the performance of steel wire mesh as porous media of double pass solar air heater in the city of Rajshahi, Bangladesh. The study includes the effect of mass flow rate, wire mesh in the bottom channel, temperature differences and thermal efficiency of a double pass solar air heater. The results show that the efficiency increases with increasing mass flow rate though temperature difference for higher mass flow rate get decreases. The mass flow rate used in this experiment varies from 0.0116 kg/s to 0.0251 kg/s. The optimum temperature difference was found to be 62.4 °C for mass flow rate 0.0116 kg/s where the minimum temperature difference was 42.75 °C for 0.0251 kg/s. The maximum collector efficiency was observed to be 82.2% at a temperature difference of 42.75 °C for mass flow rate of 0.0251 kg/s and solar intensity 1000 W/m2. From the experiment it is clear that solar air heater with steel wire mesh has the potential to heat the air with reasonable high performance.



Key words: Double pass solar collector, steel wire mesh, performance improvement.
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