This report provides a comprehensive analysis of a double pipe heat exchanger, comparing experimental data with numerical simulations conducted using ANSYS. The study investigates heat transfer characteristics under different flow configurations, including parallel and counter flow, and various mass flow rates. The methodology involves both computational and experimental approaches, with detailed descriptions of the equipment and procedures used. The report presents observations in the form of tables, comparing inlet and outlet temperatures for both computational simulations and experimental setups. Calculations, analysis, and results include the determination of the Logarithmic Mean Temperature Difference (LMTD), heat transfer areas, and heat transfer coefficients. The report also provides a comparison between experimental and computational LMTD values, offering insights into the accuracy and limitations of each method. The report also includes the discussion on the heat transfer coefficients and analysis of the heat exchanger in detail.