THERMO HYDRAULIC PERFORMANCE OF SOLAR AIR DUCT HAVING TRIANGULAR PROTRUSIONS AS ROUGHNESS GEOMETRY

Abstract

An experimental investigation has been carried out for a range of system and operating parameters in order to analyze effect of artificial roughness on heat transfer and friction in solar air heater duct having triangular protrusions as roughness geometry. An increase in heat transfer and friction loss has been observed in solar for duct having roughened absorber plate. Experimental data have been used to develop Nusselt number and friction factor correlations as function of system and operating parameters for predicting performance of the system having investigated type of roughness geometry.

Keywords

• Solar air heater; Artificial roughness; Nusselt number; Friction factor

References

1. Aharwal, K.R., Gandhi, B.K. and Saini, J.S. (2008), “Experimental Investigation on Heat Transfer Enhancement Due to a Gap in an Inclined Continuous Rib Arrangement in a Rectangular Duct of Solar Air Heater”, Renewable Energy, vol. 33, 585-596.
2. ASHRAE Standard (1977), “Methods of testing to determine the thermal performance of collectors”, American Society of Heating, Refrigerating and Air conditioning Engineers Inc., Atlanta, GA, 93-77.
3. Bhagoria, J.L., Saini, J.S. and Solanki, S.C. (2002), “Heat Transfer Coefficient and Friction Factor Correlations for Rectangular Solar Air Heater Duct having Transverse Wedge Shaped Rib Roughness on the Absorber Plate”, Renewable Energy, vol. 25, 341- 369.
4. Bhushan, B. and Singh, R. (2010), “A Review on Methodology of Artificial Roughness Used in Duct of Solar Air Heaters”, Solar Energy, vol. 35, 202-212.
5. Bhushan, B. and Singh, R. (2011), “Nusselt Number and Friction Factor Correlations for Solar Air Heater Duct Having Artificially Roughened Absorber Plate”, Solar energy, vol. 85, 1109-1118.
6. Chaube, A., Sahoo, P.K. and Solanki, S.C. (2006), “Analysis of Heat Transfer Augmentation and Flow Characteristics due to Rib Roughness over Absorber Plate of a Solar Heater”, Renewable Energy, vol. 31, 317-331.
7. Duffie, J. A. and Beckman, W.A. (1991), “Solar Engineering of Thermal Processes”, John Wiley & Sons Inc., New York.
8. Frank, K. and Mark, S.B. (2001), “Principles of Heat Transfer”,Thomson Learning Inc.

9. Garg, H.P. and Adhikari R.S. (1998), “Renewable Energy Programme and Vision in India”, Renewable Energy, vol. 14, 473-478.
10. Gupta, D., Solanki, S.C. and Saini, J.S. (1993), “Heat And Fluid Flow In Rectangular Solar Air Heater Ducts Having Transverse Rib Roughness On Absorber Plate”, Solar Energy, vol.51, 31-37.
11. Gupta, D., Solanki, S.C. and Saini, J.S. (1997), “Thermohydraulic performance of solar air heaters with roughened absorber plates”, Solar Energy, vol. 61, 33-42.
12. Gussain, P.P.S. (1990), “Renewable Energy in India”, Vikas Publishing House Pvt. Ltd., New Delhi. [11] Hans, V.S., Saini, R.P. and Saini, J.S. (2009), “Performance of Artificially Roughened Solar Air heaters-A Review”, Renewable and Sustainable Energy Reviews, vol. 13, 1854-1869.
13. Hottel, H.C. and Woertz, B.B. (1942), “Performance of Flat Plate Solar- Heat Collector”, Trans. ASME, vol. 64, 91.
14. Jaurker, A.R., Saini, J.S. and Gandhi, B.K. (2006), “Heat Transfer And Friction Characteristics Of Rectangular Solar Air Heater Duct Using Rib- Grooved Artificial Roughness” Solar Energy, vol.80, 895-907.
15. Joshi, B., Singh, R. and Bhushan, B. (2011), “Effect of Longway Length of Roughness Element on Performance of Artificially Roughened Solar Air Heater Duct”, International Journal of Advance Engineering Technology, vol.3, 234-241.
16. Karwa, R., Solanki, S.C. and Saini, J.S. (1999), “Heat Transfer Coefficient and Friction Factor Correlations for the Transitional Flow Regime in Rib Roughened Rectangular Ducts”, International Journal of Heat and Mass Transfer, vol. 42, 1597-1615.
17. Karmare, S.V. andTikekar, A.N., (2007), “Heat transfer and friction factor correlation for artificially roughened duct with metal grit ribs”, International Journal of Heat and Mass Transfer, vol. 50, 4342–4351.
18. Kumar, S. and Saini, R.P. (2007), “CFD Based Performance Analysis of a Solar Air Heater Duct Provided with Artificial Roughness”, Renewable Energy, vol. 34, 1285-1291.
19. Kumar, R.P Saini and J.S Saini (2013), “Development of Correlations for Nusselt number and Friction factor for Solar Air Heater with Roughened Duct having multi V-Shaped with Gap rig as Artificial vol. 58, 151-163.
20. Layek, Apurba, Saini, J.S. and Solanki, S.C. (2007), Heat Transfer And Friction Characteristics For Artificially Roughened Ducts With Compound Turbulators” International Journal of Heat And Mass Transfer, vol.50, 4845-4854.
21. Mahajan, T., Singh, R. and Bhushan, B. (2010), “Performance Investigation of Artificially Roughened Duct Used in Solar Air Heaters”, International Journal of Mechanical Engineering, vol. 3, 21-28.
22. Momin, A.M.E., Saini, J.S. and Solanki, S.C. (2002), “Heat transfer and friction in solar air heater duct with V-shaped rib roughness on absorber plate”, International Journal of Heat and Mass Transfer, vol.45, 3383–3396.
23. Muluwork, K.B., Saini, J.S. and Solanki, S.C. (1998.), “Studies on discrete RIB roughened solar air heaters”, Proceedings of National Solar Energy Convention, Roorkee, 75–84.
24. Nag, P.K. (2007), “Heat and Mass Transfer”, Tata McGraw Hill, New Delhi.
25. Prasad, B.N. and Saini, J.S. (1988), “Effect of Artificial Roughness on Heat Transfer and Friction Factor in a Solar Air Heater”, Solar Energy, vol.41, 555-560.
26. Sahu, M.M. and Bhagoria, J.L. (2005), “Augmentation Of Heat Transfer Coefficient By Using 90o Broken Transverse Ribs On Absorber Plate of Solar Air Heater”, Renewable Energy, vol .30, 2057-2073.
27. Saini, R.P. and Saini, J.S., (1997), “Heat transfer and friction factor correlations for artificially roughened ducts with expanded metal mesh as roughened element”, International Journal of Heat and Mass Transfer, vol. 40 (4), 973–986.
28. Singh, R., Saini, R.P. and Saini, J.S. (2006), “Nusselt Number and Friction Factor Correlations for Packed Bed Solar Energy Storage System having Large Sized Elements of Different Shapes”, Solar Energy, vol.80, 760-771.
29. Sharma ,S., Singh, R. and Bhushan, B. (2011), “CFD Based Investigation On Effect Of Roughness Element Pitch On Performance Of Artificially Roughened Duct Used In Solar Air Heaters”, International Journal Of Advance Engineering Technology, vol. 2, 234-241.
30. Soi, Aman, Singh, R. and Bhushan, B. (2010), “Effect Of Roughness Element Pitch On Heat Transfer And Friction Characteristics Of Artificially Roughened Solar Air Heater Duct” ,International Journal Of Advanced Engineering Technology vol.1, 339-346.
31. Sukhatme, S.P. and Nayak, J.K. (2008), “Principles of thermal collection and storage (Third Edition) Solar energy”, Tata McGraw Hill publishers, New Delhi.
32. Varun, Saini, R.P. and Singal, S.k.(2007), “A Review On Roughness Geometry Used In Solar Air Heaters ”, Solar Energy, vol.81,1340-1350.