A Comparative CFD Study on Solar Dimple Plate Collector with Flat Plate Collector to Augment the Thermal Performance

It is well known that surface enhancements play an important role in augmenting the thermal performance of flat plate solar collector. In this paper, an attempt is made to explain in a comparative way the effect of surface geometry of solar collector having dimple geometry with that of a flat plate solar collector of the same size. A CFD analysis was carried out for the two cases, subjected to a constant heat flux of 600W/m2 and 1000W/m2. It can be inferred from the study that the absorber plate temperature shows a rise of average surface temperature of about 50C for the dimple solar collector when compared to a flat plate solar collector. Most importantly, the average exit water temperature shows a marked improvement of about 5.50C for a dimple solar collector as compared to that of a flat plate solar collector.

• Manjunath M. S.
• K. Vasudeva Karanth
• N. Yagnesh Sharma

• CFD
• dimple-collector
• flat-plate-collector
• surface-enhancement
• thermal-performance.

[1] Patankar S. V. and Spalding D.B, "A calculation procedure for heat,
mass and momentum transfer in three dimensional parabolic flows", Int.
Journal of Heat Mass Transfer, vol 15, 1972, pp. 1787.
[2] Kumar R and Rosen M.A," Thermal performance of integrated collector
storage solar water heater with corrugated absorber surface", Applied
Thermal Engineering,2010, pp. 1-5.
[3] Prased P.R and Bryegowda H.V and Gangavati P.B, "Experimental
analysis of flat plate collector and comparison of performance with
tracking collector", European Journal of Scientific Research, vol. 40(1),
2010, pp. 144-155.
[4] Gao W, Lin W, Liu T and Xia C," Analytical and experimental studies
on the thermal performance of cross-corrugated and flat plate solar air
heaters", Applied Energy, vol. 84, 2007, pp. 425-441.
[5] Karim A and Hawlader M.N.A, "Performance investigation of flat plate,
v-corrugated and finned air collectors", Energy, vol. 312004, pp. 452-
470.
[6] Saini M and Verma J,"Heat transfer and friction correlations for a duct
having dimple shaped artificial roughness for solar air heaters", Energy,
vol. 33, 2008, pp. 1277-1287.
[7] Kumar A and Prasad B.N," Investigation of twisted tape inserted solar
water heaters- heat transfer, friction factor and thermal performance
results", Renewable Energy, vol. 19, 2010, pp. 379-398.
[8] FLUENT 6.3 users guide, Volume I to IV.