TY - JOUR
T1 - Review on the design modifications of a solar air heater for improvement in the thermal performance
AU - Arunkumar, H. S.
AU - Vasudeva Karanth, K.
AU - Kumar, Shiva
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/6
Y1 - 2020/6
N2 - Solar air heaters are widely used in various household and industrial applications. Reduced thermal efficiency of solar air heaters has necessitated the researchers to focus on the improvement of the thermal performance by providing artificial flow modification techniques in the flow field. As a result of this, laminar sublayer beneath the absorber plate will get disturbed and this helps to increase the turbulence level of the air. This results in increased heat transfer rate from the absorber plate. Paper discusses the influence of different shaped turbulators used by the various researchers in improving the thermal performance of air heaters. Design considerations, geometries used, flow conditions and their influence on turbulence, heat transfer rate, absorber temperature and thermo-hydraulic enhancement factor have been thoroughly discussed. Finally concluding remarks and the future scope for additional enhancement in the performance of solar air heater is proposed.
AB - Solar air heaters are widely used in various household and industrial applications. Reduced thermal efficiency of solar air heaters has necessitated the researchers to focus on the improvement of the thermal performance by providing artificial flow modification techniques in the flow field. As a result of this, laminar sublayer beneath the absorber plate will get disturbed and this helps to increase the turbulence level of the air. This results in increased heat transfer rate from the absorber plate. Paper discusses the influence of different shaped turbulators used by the various researchers in improving the thermal performance of air heaters. Design considerations, geometries used, flow conditions and their influence on turbulence, heat transfer rate, absorber temperature and thermo-hydraulic enhancement factor have been thoroughly discussed. Finally concluding remarks and the future scope for additional enhancement in the performance of solar air heater is proposed.
UR - http://www.scopus.com/inward/record.url?scp=85082393956&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85082393956&partnerID=8YFLogxK
U2 - 10.1016/j.seta.2020.100685
DO - 10.1016/j.seta.2020.100685
M3 - Article
AN - SCOPUS:85082393956
SN - 2213-1388
VL - 39
JO - Sustainable Energy Technologies and Assessments
JF - Sustainable Energy Technologies and Assessments
M1 - 100685
ER -
