An experimental analysis has been carried out for augmentation of thermo-hydraulic performance of a solar air heater (SAH) duct with roughened surface in the pattern of gap in V-geometry with symmetrical gap and staggered elements as turbulence promoter. The investigation encompassed duct aspect ratio (W/H) of 12, relative roughness pitch (P/e) of 10, relative roughness height (e/Dh) of 0.043, angle of attack (α) of 60o, ratio of staggered rib position to pitch (P’/P) of 0.4, ratio of gap width to rib height (g/e) of 4, ratio of staggered size to rib height (r/e) of 4, number of main gaps (Ng) of 4, relative gap size of additional gap in symmetrical rib elements (g’/e) of 0.5-2, relative gap position of additional gap in symmetrical rib elements (d/w) of 0.25-0.85 and Reynolds number ranging from 4000 to 15,000. Results of the proposed roughness geometry have also been compared to previously reported geometry. Maximum augmentation in Nusselt number (Nu) and friction factor (f) is found to be 2.51 and 2.70 times respectively than the smooth plate for g’/e = 1 and d/w = 0.65. Maximum value of thermo-hydraulic performance (THP) is found to be 1.82 for g’/e = 1 and d/w = 0.65.