By utilising absorber plates exposed to solar radiation, solar air warmers efficiently harness solar energy. The absorbed radiation is next converted into thermionic energy at periphery of plates, and ultimately the thermionic energy is transported to fluid that is carried via a collector. The fact that there is little convective heat transfer amidst at absorber plate and air absorbes the heat while flows over it. Demonstrate’s low efficiency of flat plate solar preheaters. Most popular and efficient way to increase a solar preheater effectiveness is to incorporate roughness (broken perforated curve ribs) absorber plate features from the bottom half. The research's central idea is a solar preheater with purposefully roughened, broken perforated curved ribs that predict the device's convective heat transmission characteristics. A useful tool for heating a space using photovoltaic energy is a solar preheater. A Reynolds no. (Re) can be amidst 4000 and 20,000. This aims to derive comparitive analysis of peforated roughness parameters like roughness height (e/Dh), comparitive roughness pitch (8–14), comparitive roughness curve angle (30–75), comparitive roughness curve hydraulic dia (0.0333 metres), and comparitive roughness width gap (g/e=1)—broken curved roughness of the 5:1 aspect ratio solar preheater absorber plate. The simulations of computational fluid dynamics (CFD) were performed using ANSYS FLUENT 15.0 programme. Similar flow parameters and outcomes of smooth passage are compared with other roughned passage. Computational fluid dynamics (CFD) simulations used to perform ANSYS FLUENT 15.0 programme. Outcome’s of the smooth passage (duct) and roughned passage (duct) are compared to the impact of different parameters on heat transmission and friction when the flow conditions are same.