Validation of PCHE-Type CO 2 –CO 2 Recuperative Heat Exchanger Modeling Using Conductance Ratio Method

Viktoria Carmen Illyés (), Francesco Crespi, Xavier Guerif and Andreas Werner
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Viktoria Carmen Illyés: Institute for Energy Systems and Thermodynamics, Technische Universität Wien, Getreidemarkt 9, 1060 Wien, Austria
Francesco Crespi: Department of Energy Engineering, University of Seville, Camino de los descubrimientos s/n, 41092 Seville, Spain
Xavier Guerif: Kelvion Thermal Solutions, 25 Rue du Ranzay, 44300 Nantes, France
Andreas Werner: Institute for Energy Systems and Thermodynamics, Technische Universität Wien, Getreidemarkt 9, 1060 Wien, Austria

Energies, 2025, vol. 18, issue 13, 1-26

Abstract: Printed-circuit heat exchangers (PCHEs) are compact exchangers with exceptional heat-transfer properties that are important for supercritical CO 2 technology. Recalculating the heat transfer under off-design conditions is a common task. Thus, in this paper, traditional and PCHE-specific correlations are analyzed in a conventional, discretized one-dimensional model using the conductance ratio method. The predicted heat transfer is compared with the experimental data of a CO 2 –CO 2 heat exchanger with zigzag-type channels and one with s-shaped fin channels under various working conditions. The results demonstrate that all selected heat-transfer correlations predicted the transferred heat within +/−20% using the conventional model. The much simpler conductance ratio method yields better results, with heat transfer within +/−10%, even with conservative inputs to the model.

Keywords: printed-circuit heat exchanger; zigzag channels; s-shaped fin channels; heat transfer; heat exchanger (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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