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Journal of Renewable and Sustainable Energy / Volume 4 / Issue 1 / REGULAR ARTICLES

J. Renewable Sustainable Energy 4, 013115 (2012); http://dx.doi.org/10.1063/1.3682072 (17 pages)

Heat transfer and friction characteristics of solar air heater duct roughened by broken V-shape ribs combined with staggered rib piece

Anil K. Patil1, J. S. Saini2, and K. Kumar3

1Uttarakhand Technical University, Dehradun (U.A.) 248009, India
2Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
3Department of Mechanical Engineering, D. I. T., Dehradun (U.A.) 248009, India

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(Received 12 November 2011; accepted 30 December 2011; published online 22 February 2012)

Thermal performance of solar air heater has been found to be substantially improved by the application of artificial roughness provided on underside of absorber surface. The present investigation was taken up to study the effect of broken V-rib roughness combined with staggered ribs on heat transfer and friction in a flow through artificially roughened solar air heater duct. This work covered a range of Reynolds number (Re) 3000–17 000, relative staggered rib pitch (p′/p) 0.2–0.8, relative staggered rib size (r/e) 1–2.5, relative gap position (s′/s) 0.2–0.8 for the fixed values of relative roughness pitch (p/e) of 10, relative roughness height (e/Dh) of 0.043, relative gap size (g/e) of 1, and angle of attack (α) of 60°. Experimental data pertinent to heat transfer and friction was generated and thermohydraulic performance was determined for different sets of roughness and flow parameters.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL PROGRAM
    1. Experimental setup and procedure
    2. Roughened absorber plates
    3. Range of roughness and flow parameters
  3. VALIDATION OF EXPERIMENTAL SETUP
  4. DATA PROCESSING
    1. Mass flow rate of air
    2. Velocity of air in the duct
    3. Reynolds number
    4. Friction factor
    5. Heat transfer rate
    6. Heat transfer coefficient
    7. Nusselt number
    8. Thermohydraulic performance parameter (η)
  5. RESULTS AND DISCUSSION
    1. Effect of Reynolds number (Re)
    2. Effect of relative gap position (s′/s)
    3. Effect of staggered rib position (p′/p)
    4. Effect of staggered rib size (r/e)
    5. Thermohydraulic performance (η)
  6. CONCLUSIONS

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KEYWORDS, PACS, and IPC

Keywords

friction, heat transfer, solar heating

PACS

International Patent Classification (IPC)

  • F24J2/00

    Use of solar heat, e.g. solar heat collectors

  • F28

    Heat exchange in general

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3682072

PUBLICATION DATA

ISSN

1941-7012 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    S. Singh, S. Chander, and J. S. Saini, J. Renew. Sustain. Energy 3, 013108 (2011)JRSEBH000003000001013108000001.


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