Abstract
This paper is concerned with heat transfer by plate spacers in plate-fin heat exchangers. The spacers are considered as fins attached to the plates and are exposed to certain boundary conditions. The thermal resistances at the contact surfaces between the plates and the fins are assumed to be different from one another. Based on this model, equations for heat fluxes at contact surfaces are derived. Calculations from these equations reveal a considerable influence of the thermal resistances at the contact surfaces on the heat transfer.
Zusammenfassung
In der Arbeit wird der Wärmetransport durch Abstandshalter in Platten-Rippen-Wärmeübertragern behandelt. Die Abstandshalter werden wie Rippen betrachtet, die an den Platten befestigt und bestimmten Randbedingungen ausgesetzt sind. An den Kontaktstellen zwischen Platten und Rippen werden unterschiedliche Wärmewiderstände angenommen. Aufgrund dieses Modells lassen sich Gleichungen zur Berechnung der Wärmeströme an den Kontaktflächen herleiten. Die nach diesen Gleichungen vorgenommenen Berechnungen zeigen einen deutlichen Einfluß des thermischen Widerstandes an den Kontaktflächen auf den Wärmetransport in den Abstandshaltern.
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Abbreviations
- L :
-
plate spacing, spacer length
- m :
-
fin parameter
- \(\dot Q\) :
-
heat flux
- r :
-
thermal contact resistance
- S :
-
cross-sectional area of spacer
- U :
-
circumference
- z :
-
coordinate along spacer
- α:
-
heat transfer coefficient
- δ:
-
thickness of spacer
- λ:
-
thermal conductivity
- ϑ:
-
temperature
- θ:
-
temperature difference
- F :
-
fluid
- M :
-
maximum
- O :
-
plate
- R :
-
finR
- W :
-
finW
References
Webb, R. L.: Principles of enhanced heat transfer. J. Wiley & Sons, Inc., 1994
Shah, R. K.: Classification of heat exchangers. In: Heat exchangers (Ed. S. Kakaç et al.), Hemisphere 1981
Kern, D. Q.; Kraus, A. D.: Extended surface heat transfer. McGraw-Hill 1972
Brunot, A. W.;Buckland, F. E.: Thermal contact resistance of laminated and machined joints. Transactions ASME 71 (1949) 253–257
Malkov, V. A.: An investigation of the temperature dependence of thermal contact resistances. Heat Transfer-Soviet Research 6 (1974) 92–100
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Mitrovic, J. Heat transfer by plate spacers in plate-fin heat exchangers. Heat and Mass Transfer 30, 461–465 (1995). https://doi.org/10.1007/BF01647452
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DOI: https://doi.org/10.1007/BF01647452