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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

DIRECT THERMAL SIZING OF PLATE-FIN HEAT EXCHANGERS

E. M. Smith
University of Newcastle Upon Tyne, NE1 7RU, U.K.

DOI: 10.1615/IHTC10.380
pages 55-66

Abstrakt

(ε-Ntu) methods have been popular because they seemed capable of finding explicit terminal temperatures in cases where the LMTD approach required iteration. By developing an (LMTD-Ntu) method, it is shown that an LMTD approach can be as explicit as an Effectiveness approach.

'Sizing' methods have traditionally posed more problems than 'Rating' methods. This is because guessing one principal dimension of the exchanger may be necessary before the full performance of the guessed heat exchanger can be evaluated for comparison with design requirements.

For the class of heat exchangers in which 'local' geometry of the heat transfer surface is fully representative of the whole geometry, this is no longer necessary. Methods of direct-sizing exist which go directly to the optimum size of heat transfer surface, while satisfying all thermal performance constraints. Examples of direct-sizing of plate-fin heat exchangers are presented.

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