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This study evaluates heat transfer and fluid flow behavior in a rectangular duct with inverted U-type turbulator roughened ribs mounted on one of the principal wall (solar plate) by computational fluid dynamics software (Fluent 6.3.26 Solver). In this study CFD software has been used to perform a numerical simulation for enhance turbulent heat transfer. In this study, the Reynolds-Averaged Navier–Stokes analysis is used as a numerical technique and the k-e turbulent model with near-wall treatment as a turbulent model. The results are validated by comparing with existing experimental datas. The Reynolds number, pitch-to-rib high ratio and different pitch are chosen as design variables. Reynolds number range from 3800 to 18000; ratio of turbulator height to duct hydraulic mean diameter is varied from, e/Dh = 0.0186 to 0.03986 (Dh = 37.63 mm and e = 0.7 to 1.5 mm) and turbulator pitch to height ratio is varied from, p/e = 6.67 to 57.14 (p = 10 to 40 mm).The angle of attack of flow on turbulators, a = 90o kept constant during the whole analysis. The effects of roughness parameters on Nusselt number and friction factor have been discussed and the conditions for the best performance have been analysied.