CFD Analysis of a Helically Coiled Heat Exchanger with and without Third Stream

M. A. Awan, S. Muhammad, J. R. Khan

Abstract


The present work includes CFD Simulation of a HCHEx with three different fluids streams exchanging heat in a single shell. The hot fluid flows through the coil, the secondary fluid flows in the shell side and a tertiary fluid flows through a central pipe that runsstraight through the heat exchanger parallel to the shell axis. An attempt has been made to analyze the effect of three different streams in a single shell in terms of heat transfer characteristics by using ANSYS Fluent 14.0. All the three fluids flowing through the heat exchanger are taken as water. The emphasis is to focus on improved thermal performance and compact structure.It was observed that the Three Stream configuration offers a high compact structure and a high overall coil side H.T co-efficient that can minimize the requirement of heat exchangers network designing used for energy efficient systems. It is also observed that the third stream implies a significant effect over the thermal performance of the heat exchanger and also imparts a significant size reduction effect in designing of the heat exchanger thus providing more compact structures, desired in many applications where the space and weight limitation are of primary importance. Since there exists no published numerical or simulation data of multiple fluids heat exchanger so this CFD simulation of three stream heat exchanger can be a one step forward for the innovative designs of advanced and sophisticated HXs.


Keywords


Compact heat exchanger; Computational fluid dynamics analysis ;

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