论文信息 - Performance prediction of solar air heater having roughened duct provided with transverse and inclined ribs as artificial roughness

Performance prediction of solar air heater having roughened duct provided with transverse and inclined ribs as artificial roughness

An experimental study has been carried out to investigate the effective efficiency of a solar air heater duct provided with transverse and inclined ribs as artificial roughness elements on the absorber plate. The range of parameters considered for the present investigation; Reynolds number (Re) 2000–14,000, relative roughness pitch (p/e) 3–8 and a fixed value of relative roughness height (e/D) of 0.030. The effective efficiency has been computed based on the experimentally determined values for the range of parameters considered. Further an attempt has also been made to optimize the thermal efficiency for the same system under similar conditions by Taguchi method.

[1] Varun,et al. A review on roughness geometry used in solar air heaters , 2007 .

[2] Varun,et al. Investigation of thermal performance of solar air heater having roughness elements as a combination of inclined and transverse ribs on the absorber plate , 2008 .

[3] S. Mullick,et al. Heat transfer characteristics of a solar air heater used for drying purposes , 1983 .

[4] S. Klein. Calculation of Flat-Plate Collector Loss Coefficients , 1975, Renewable Energy.

[5] B. N. Prasad,et al. Effect of artificial roughness on heat transfer and friction factor in a solar air heater , 1988 .

[6] John Stufken,et al. Taguchi Methods: A Hands-On Approach , 1992 .

[7] R. J. Goldstein,et al. Heat transfer and friction in tubes with repeated-rib roughness , 1971 .

[8] R. Shah,et al. Handbook of single-phase convective heat transfer , 1987 .