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Energies 2019, 12(7), 1406; https://doi.org/10.3390/en12071406

Multi-Dimensional Performance Evaluation of Heat Exchanger Surface Enhancements

Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
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Received: 16 January 2019 / Revised: 1 April 2019 / Accepted: 7 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Heat Transfer Enhancement)
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Abstract

Enhanced heat transfer surfaces allow more energy-efficient, compact and lightweight heat exchangers. Within this study, a method for comparing different types of enhancement and different geometries with multiple objectives is developed in order to evaluate new and existing enhancement designs. The method’s objectives are defined as energy, volume, and mass efficiency of the enhancement. They are given in dimensional and non-dimensional form and include limitations due to thermal conductivity within the enhancement. The transformation to an explicit heat transfer rate per dissipated power, volume, or mass is described in detail. The objectives are visualized for different Reynolds numbers to locate beneficial operating conditions. The multi-objective problem is further on reduced to a single-objective problem by means of weighting factors. The implementation of these factors allows a straightforward performance evaluation based on a rough estimation of the energy, volume, and mass importance set by a decision maker. View Full-Text
Keywords: enhanced heat transfer; performance evaluation method; multi-objective optimization; heat exchanger design; thermal-hydraulic performance enhanced heat transfer; performance evaluation method; multi-objective optimization; heat exchanger design; thermal-hydraulic performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fugmann, H.; Laurenz, E.; Schnabel, L. Multi-Dimensional Performance Evaluation of Heat Exchanger Surface Enhancements. Energies 2019, 12, 1406.

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