Effect of Gap Position in Broken V-rib Roughness Combined with Staggered Rib on Thermohydraulic Performance of Solar Air Heater
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Abstract
Application of artificial roughness on underside of absorber surface has been found to be effective technique to improve thermo hydraulic performance of solar air heaters. In progression to the previous researches, the present study discloses 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. The experimentations were performed to collect the data on heat transfer and friction by varying the Reynolds number (Re) between 3000 and 17,000, relative gap position (s′/s) from 0.2 to 0.8, for the fixed values of relative staggered rib pitch p′/p = 0.6, relative staggered rib size r/e = 1, relative roughness pitch p/e = 10, relative roughness height e/Dh = 0.043, relative gap size g/e = 1, and angle of attack α = 60°. The present roughness geometry with relative gap position (s′/s) of 0.6 corresponding to flow Reynolds number (Re) of 13,150 yields the best thermohydraulic performance.
Copyright © 2011 De Gruyter
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Articles in the same Issue
- Notice from the Editorial Office
- Short Reports
- Zero-Emission Power Generation – Fuel Cells Are Coming, But Still Facing Obstacles in Germany
- Toward Visible Light Response: Overall Water Splitting Using Heterogeneous Photocatalysts
- Pitch Carbon-coated Lithium Sulfide Electrode for Advanced, Lithium-metal Free-sulfur Batteries
- Effect of Gap Position in Broken V-rib Roughness Combined with Staggered Rib on Thermohydraulic Performance of Solar Air Heater
- Efficiency Enhancement in Hybrid P3HT/Silicon Nanocrystal Solar Cells
- A Substitute for Gasoline – With a Carbon Neutral Character
- Sustainable Development of Green Energy Technologies in the Republic of Sudan
- Formation and Characterisation of Solution Processed “Pseudo-Bilayer” Organic Solar Cells – GREEN, 2011, Vol. 1, Number 3-4, pp. 291–298
- Future Conferences on Sustainable Energy Science and Policy 2012
