The constructal size of a heat exchanger | Zendy

Adrian Bejan | Zendy; Sylvie Lorente | Zendy; Lauber Martins | Zendy; Josua P. Meyer | Zendy

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The constructal size of a heat exchanger

Author(s) -

Adrian Bejan,

Sylvie Lorente,

Lauber Martins,

Josua P. Meyer

Publication year - 2017

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4991014

Subject(s) - plate fin heat exchanger , constructal law , laminar flow , heat exchanger , heat spreader , micro heat exchanger , mechanics , heat transfer , moving bed heat exchanger , turbulence , materials science , thermodynamics , plate heat exchanger , computer science , mechanical engineering , engineering , physics

The architecture of heat exchangers is a classical subject that has been studied extensively in the past. In this paper, we address the fundamental question of what the size of the heat exchanger should be, in addition to what architectural features it should have. The answer to the size question follows from the tradeoff between (1) the useful power lost because of heat transfer and fluid flow and (2) the power destroyed during transportation, manufacturing, and maintenance. Changes in heat exchanger size induce changes in the opposite sign in the power requirements (1) and (2). This fundamental tradeoff regarding size is illustrated by considering one side of a heat exchanger (one flow passage) in laminar flow and in fully rough turbulent flow, with several duct cross sectional shapes and arrays of channels in parallel. The size tradeoff is present in heat exchanger applications across the board, from vehicles to stationary power plants.

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