The present study includes design development of a triple concentric tube heat exchanger for oil cooling application. CFD analysis of the heat transfer between fluids and also experimental investigation of the heat transfer through the heat exchanger having Water-Oil-Water combination i.e. water flowing in the inner tube and the outer annulus and oil through the inner annulus is carried out. Theoretical studies are carried out for numerical simulations and evaluation of heat transfer rate. The Triple Concentric Tube Heat Exchanger is to be evaluated experimentally for temperature variation along its length. CFD analysis is used to validate the analytical design.