Volume No. 6 Issue No.: 3A Page No.: 874-878 Jan-Mar 12

 

THERMOHYDRAULIC PERFORMANCE OF SOLAR AIR COLLECTOR USING W-SHAPED ARTIFICIAL ROUGHNESS

 

A.M. Lanjewar*, J.L. Bhagoria and R.M. Sarviya

Department of Mechanical Engineering, M.A.N.I.T., Bhopal, Madhya Pradesh (INDIA)

 

Received on : November 10, 2011

 

ABSTRACT

 

An experimental investigation has been carried out to study heat transfer, friction characteristics and thermo- hydraulic performance of roughened absorber plate in solar air heater by using W-shape rib roughness, the roughened wall being heated while the remaining three walls insulated. The roughened wall has relative roughness height (e/Dh) 0.018, relative roughness pitch (p/e) 10, rib height 0.8 mm, angle of attack in the range of 30° - 60° and duct aspect ratio (W/H) 8. The air flow rate corresponds to Reynolds number between 2300-14000. Experimental results have been compared with those for smooth duct under similar flow and thermal boundary condition. Performance comparison of ribs with different angle of attack show that W-shape ribs with angle of attack of 60o gives best thermo-hydraulic performance.

 

Keywords : Solar air heater, Thermo-hydraulic performance W-shape ribs, Friction Characteristics, Neat tronsjer

 

 

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