[en] In this work, a novel and robust solution approach is presented that can be used to predict the steady-state thermal heat transfer rate for counterflow heat exchangers with any combination of single-phase and two-phase conditions within the heat exchanger. This methodology allows for multiple internal pinching points, as well as all permutations of subcooled liquid, two-phase and superheated vapor sections for the hot and cold fluids. A residual function based on the matching of the required and available thermal conductances in each section is derived, and Brent's method is then used to drive the residual to zero. Examples are presented for the application of this methodology to a water-heated n-Propane evaporator. The computational time required to execute the model for a simple case is on the order of one millisecond when the tabular interpolation methods of CoolProp are applied. Source code for the algorithm is provided in the Python programming language as an appendix.
Disciplines :
Energy
Author, co-author :
Bell, Ian
Quoilin, Sylvain ; Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Georges, Emeline ; Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Braun, James E.
Groll, Eckhard A.
Horton, Travis
Lemort, Vincent ; Université de Liège > Département d'aérospatiale et mécanique > Systèmes énergétiques
Language :
English
Title :
A generalized moving-boundary algorithm to predict the heat transfer rate of counterflow heat exchangers for any phase configuration
Publication date :
March 2015
Journal title :
Applied Thermal Engineering
ISSN :
1359-4311
eISSN :
1873-5606
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
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