A CFD package (ANSYS FLUENT 15.0) was used for the numerical study of heat transfer characteristics of a helical coiled double pipe heat exchanger for counter flow. The CFD results when compared with the results from different studies were well within the error limits. The study showed that the effective configuration of heat transfer performances of the counter-flow. The simulation was carried out for fluid to fluid heat transfer characteristics for different fluids, solids and different inlet temperatures were studied. Effectiveness of Helical water combination gives more effectiveness16.33%than other combinations. From the velocity vector plot it was found that the fluid particles were under going an oscillatory motion inside both the pipes. From the pressure and velocity contours it was found that along the outer side of the pipes the velocity and pressure values were higher in comparison to the inner values.