Heat Exchanger Design and Optimization

Abstract

Heat exchangers are devices that transfer heat energy between fluids by utilizing heat transfer modes of conduction and convection. The shell and tube heat exchanger configuration is a common type of heat exchanger with a shell containing a bundle of parallel tubes through which two fluids of different temperatures flow inside and around the tubes, exchanging heat energy. This design is often used in petrochemical processing, oil rigs, and other high-pressure environments. In this study, an HT33 Shell and Tube Heat Exchanger Unit (Armfield, Inc.) with cold water flowing in the shell configured for countercurrent fluid flow arrangement was experimentally tested with specific velocities of hot water flow in the tubes to determine the effect on the overall thermal efficiency of the heat exchanger. Secondly, computer modeling of this exact heat exchanger was performed using the finite volume method (FVM) in ANSYS Fluent, a commercial engineering simulation software, to validate experimentally tested results and optimize the performance of the heat exchanger. It was experimentally recorded that when the rate of fluid flow in the heat exchanger was increased, the overall thermal efficiency of the heat exchanger also improved, boosting the heat exchanger’s energy economy. The experimental results identify flow velocity as a significant factor towards optimizing thermal efficiency. With numerous adjustable parameters, such as exchanger geometry, fluid flow conditions, and material selection, advanced software tools including MATLAB and ANSYS Fluent are being extensively utilized to investigate and optimize heat exchanger designs, enhancing their thermal performance and overall effectiveness.