Determination of Effective Efficiency of Artificially Roughened Solar Air Heater Duct Using Ribs

  • Khushmeet Kumar Department of Mechanical Engineering, Baddi University of Emerging Sciences & Technology, Baddi -173205 (India)
  • D.R. Prajapati department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh-160012 (India)
  • Sushant Samir Department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh -160012 (India)
Keywords: Effective efficiency, Heat Transfer, Roughness, Friction factor, Solar air heaters

Abstract

Artificial surface roughness is used to increase the thermal performance of a solar air heater. The intent is to improve heat transfer between the absorber plate and air flowing through the duct. However, roughness also increases the force required to flow air through the duct, which leads to an increase in the pumping power required in the duct, thus resulting in a decrease in the effective or overall efficiency of the solar air heater duct. In this article effective efficiency of various geometries used in solar air heater are computed by the use of heat transfer and friction factor experimental correlations. A comparison is also presented for the selection of optimum roughness geometry.

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Author Biographies

Khushmeet Kumar, Department of Mechanical Engineering, Baddi University of Emerging Sciences & Technology, Baddi -173205 (India)

Khushmeet Kumar, corresponding author, is Assistant Professor in the Department of Mechanical Engineering, Baddi University of Emerging Sciences & Technology, Baddi -173205 (India). He is having the teaching and research experience of more than 7 years and published more than 12 research papers in international and national journals of repute and in the proceedings of the conferences. E-mail: khush2k3@yahoo.com

D.R. Prajapati, department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh-160012 (India)

Dr. D.R. Prajapati is Assistant Professor in the department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh-160012 (India).He is having the teaching and research experience of more than 16 years and published more than 65 research papers in international and national journals of repute and in the proceedings of the conferences. He is also reviewer of 6 international journals. He is also recipient of first D. N. Trikha research award for excellent research publications in international journal for the year 2009 in PEC University of Technology. E-mail: drprajapati@pec.ac.in and praja_3000@yahoo.com

Sushant Samir, Department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh -160012 (India)

Dr. Sushant Samir is Assistant Professor in the Department of Mechanical Engineering, PEC University of Technology (formerly Punjab Engineering College), Chandigarh -160012 (India). He has over 22 years of experience and published more than 20 research papers in international and national journals and in conference proceedings. He also organized two short term courses for the faculty of technical institutions and engineers from industries. E-mail: sushantsamir@pec.ac.in

References

Duffie J.A. and Beckman W.A. (1991). Solar engineering thermal processes.

New York: John Wiley.

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 25(3): 341-69.

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 13(8): 1854-69.

Varun, Saini R.P. and Singal S.K. (2007). A review on roughness geometry

used in solar air heaters. Solar Energy 81: 1340–50.

Nikuradse J. (1958). Laws of flow in rough pipes. NACA: Technical

Memorandum, 1292.

Kumar A., Saini R.P. and Saini J.S. (2012). Heat and fluid flow characteristics

of roughened solar air heater ducts - A review. Renewable

Energy 1-18.

Jaurker A.R., Saini J.S. and Gandhi B.K. (2006). Heat transfer coefficient

and friction characteristics of rectangular solar air heater duct

using rib grooved artificial roughness. Solar energy 80(8): 895-907.

Kumar A., Bhagoria J.L. and Sarviya R.M. (2009). Heat transfer and

friction correlations for artificially roughened solar air heater duct

with discrete W-shaped ribs. Energy Conversion and management 50(8):

-17.

Saini S.K. and Saini R.P. (2008). Development of correlations for Nusselt

number and friction factor for solar air heater with roughened

duct having arc-shaped wire as artificial roughness. Solar Energy 2008,

: 1118-30.

Singh S., Chander S. and Saini J.S. (2011). Heat transfer and friction

factor correlations of solar air heater ducts artificially roughened with

discrete V-down ribs. Energy 36: 5053-64.

Saha S.K. (2010). Thermal and friction characteristics of turbulent

flow through rectangular and square ducts with transverse ribs and

wire-coil inserts. Experimental Thermal and Fluid Science 34: 575–89.

Hans V.S., Saini R.P. and Saini J.S. (2010). Heat transfer and friction

factor correlations for a solar air heater duct roughened artificially

with multiple v-ribs. Solar Energy 84: 898–11.

Lanjewar A., Bhagoria J.L. and Sarviya R.M. (2011). Heat transfer and

friction in solar air heater duct with W-shaped rib Roughness on absorber

plate. Energy 36: 4531-41.

Gupta D., Solanki S.C. and Saini J.S. (1997). Thermo-hydraulic performance

of solar air heater with roughened absorber plates. Solar Energy

(1): 33-42.

Karmare S.V. and Tikekar A.N. (2007). Heat transfer and friction factor

correlation for artificially roughened duct with metal grit ribs.

International Journal of Heat and Mass Transfer 50(21-22): 4342-51.

Cortes A. and Piacentini R. (1990). Improvement of the efficiency of

the bare solar collector by means of turbulence promoters. Applied Energy

(4): 253-56.

Wright L.M., Fu W.L. and Han J.C. (2004). Thermal performance of

angled, V-shaped and W-shaped rib turbulators in rotating rectangular

cooling channels (AR = 4:1). Trans ASME 126: 604-14.

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