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Dynamics of convection heat exchangers
Author(s) -
Heidemann R. A.,
Huckaba C. E.,
Eisen F. S.,
Weissman L. I.,
Gallatig G. M.
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490127
Subject(s) - mechanics , heat exchanger , heat transfer , heat transfer coefficient , thermodynamics , steady state (chemistry) , thermal conduction , transient (computer programming) , ntu method , heat flux , forced convection , flow (mathematics) , convective heat transfer , convection , materials science , micro heat exchanger , chemistry , physics , computer science , operating system
A mathematical model is developed for heat exchangers with condensing vapors on one side which includes the effects of variations in the local film heat transfer coefficients and allows for energy accumulation and conduction in the tube wall. A numerical integration scheme for the flow forced case is presented. The model is tested against experimental steady state and transient data for a steam‐water exchanger. It was necessary to modify the standard correlations of heat transfer coefficients to get a match of the overall steady state heat flux actually obtained in the apparatus. With these modified heat transfer coefficients, the model proved capable of predicting flow forced transients. These results are contrasted with transients predicted by a simple lumped parameters model employing empirically fit overall heat transfer coefficients. The lumped parameters model is shown quite adequate for predicting transient behavior under the specific conditions studied. The reasons for and limitations on the success of this very simple model are explored.