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Heat transfer and friction in solar air heater duct with W-shaped rib roughness on absorber plate

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  • Lanjewar, Atul
  • Bhagoria, J.L.
  • Sarviya, R.M.

Abstract

Artificial roughness in form of ribs is convenient method for enhancement of heat transfer coefficient in solar air heater. This paper presents experimental investigation of heat transfer and friction factor characteristics of rectangular duct roughened with W-shaped ribs on its underside on one broad wall arranged at an inclination with respect to flow direction. Range of parameters for this study has been decided on basis of practical considerations of system and operating conditions. Duct has width to height ratio (W/H) of 8.0, relative roughness pitch (p/e) of 10, relative roughness height (e/Dh) 0.018–0.03375 and angle of attack of flow (α) 30–75°. Air flow rate corresponds to Reynolds number between 2300–14,000. Heat transfer and friction factor results have been compared with those for smooth duct under similar flow and thermal boundary condition to determine thermo-hydraulic performance. Correlations have been developed for heat transfer coefficient and friction factor for roughened duct.

Suggested Citation

  • Lanjewar, Atul & Bhagoria, J.L. & Sarviya, R.M., 2011. "Heat transfer and friction in solar air heater duct with W-shaped rib roughness on absorber plate," Energy, Elsevier, vol. 36(7), pages 4531-4541.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:4531-4541
    DOI: 10.1016/j.energy.2011.03.054
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    References listed on IDEAS

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    1. Sahu, M.M. & Bhagoria, J.L., 2005. "Augmentation of heat transfer coefficient by using 90° broken transverse ribs on absorber plate of solar air heater," Renewable Energy, Elsevier, vol. 30(13), pages 2057-2073.
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    5. Saini, R.P. & Verma, Jitendra, 2008. "Heat transfer and friction factor correlations for a duct having dimple-shape artificial roughness for solar air heaters," Energy, Elsevier, vol. 33(8), pages 1277-1287.
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    7. Bhagoria, J.L & Saini, J.S & 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, Elsevier, vol. 25(3), pages 341-369.
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