Thermal performance investigation of the flat and spherical dimple absorber plate solar air heaters

•The Present study shows performance of Flat and dimple plate solar air heater.•The study has been conducted for a mass flow rate of 0.009 kg/s to 0.028 kg/s.•The dimple plate solar air heater shows the highest heat transfer.•The maximum rise of the outlet temperature of the dimple plate is about 4....

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Bibliographic Details
Published in:Solar energy 2019-11, Vol.193, p.309-323
Main Authors: Perwez, Ashif, Kumar, Rakesh
Format: Article
Language:English
Subjects:
Air heaters
Dimpling
Environmental conditions
Flat absorber plate
Flat plates
Flow rates
Heat transfer
Mass flow rate
Nusselt number
Repair & maintenance
Solar air heater
Solar energy
Spherical dimple absorber plate
Thermodynamic efficiency
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Summary:•The Present study shows performance of Flat and dimple plate solar air heater.•The study has been conducted for a mass flow rate of 0.009 kg/s to 0.028 kg/s.•The dimple plate solar air heater shows the highest heat transfer.•The maximum rise of the outlet temperature of the dimple plate is about 4.6 °C.•The thermal efficiency of a dimple plate solar air heater is about 35.50%. An experimental investigation has been conducted to determine the thermal performance of a spherical dimple plate solar air heater (SDPSAH) and a flat plate solar air heater (FPSAH) at distinctive environmental conditions at IIT (ISM) Dhanbad (23.79°N), India. The study has been conducted for a mass flow rate of air varying from 0.009 kg/s to 0.028 kg/s. The results indicate that the SDPSAH shows the highest heat transfer rate, which is about 1.51 to 1.64 times higher than the corresponding FPSAH. The maximum rise of the outlet temperature of the SDPSAH is about 4.6 °C greater than the corresponding FPSAH for 0.009 kg/s mass flow rate of air. The instantaneous thermal efficiency of the SDPSAH is about 23.45% to 35.50% greater than the corresponding FPSAH.
ISSN:0038-092X
1471-1257
DOI:10.1016/j.solener.2019.09.066