In this experimental work, the investigation about the impact of the geometrical dispositions of the triangular obstacles on the performance parameters such as pressure drop and thermal efficiency. A number of input parameters affects the performance of the system. These input parameters are the heat flux, mass flow rate ( = 0.01 to 0.02 kg/s), obstacles’ height, h from 22 mm to 37.5 mm, their cross-stream wise pitch (Ly = 56 to 206 mm), their angle of inclination with the vertical plane (Θ = 300 - 900), and stream wise pitch (Lx =30 to 70 mm). Moreover, an optimum set of input parameters is determined using the statistical modeling of the operating conditions by the Taguchi technique.