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research-article

Modeling of two-phase heat exchangers with zeotropic fluid mixtures

[+] Author and Article Information
David Gomse

Karlsruhe Institute of Technology, Institute of Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
david.gomse@kit.edu

Thomas M. Kochenburger

Karlsruhe Institute of Technology, Institute of Technical Thermodynamics, and Refrigeration, Engler-Bunte-Ring 21, 76131 Karlsruhe, Germany
kochenburger@kit.edu

Steffen Grohmann

Karlsruhe Institute of Technology, Institute of Technical Thermodynamics and Refrigeration, Engler-Bunte-Ring 21, 76131 Karlsruhe, Germany
steffen.grohmann@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4038852 History: Received January 18, 2017; Revised December 15, 2017

Abstract

Heat exchangers are important components in many engineering applications. This paper proposes a numerical two-phase heat exchanger model with simultaneous heat transfer and pressure drop calculations. The presented model provides a modelling framework compatible with numerous different correlations for both single- and two-phase flow of pure fluids and fluid mixtures. Furthermore, it considers nonconstant fluid properties as well as longitudinal heat conduction and parasitic heat loads, which is particularly relevant in mixed refrigerant cycles for cooling of low-temperature applications. The governing equations are derived and the solution strategy is presented, followed by the model validation against analytical solutions in the corresponding limits. Finally, an exemplary heat exchanger is analysed using both homogeneous and separated flow models and the results are compared with experimental data from literature.

Copyright (c) 2017 by ASME
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