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Discussion

“Entransy,” and Its Lack of Content in Physics

[+] Author and Article Information
Adrian Bejan

Department of Mechanical Engineering
and Materials Science,
Duke University,
Durham, NC 27708
e-mail: abejan@duke.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 30, 2013; final manuscript received December 10, 2013; published online March 6, 2014. Assoc. Editor: Oronzio Manca.

J. Heat Transfer 136(5), 055501 (Mar 06, 2014) (6 pages) Paper No: HT-13-1519; doi: 10.1115/1.4026527 History: Received September 30, 2013; Revised December 10, 2013

Here, I show that “entransy” has no meaning in physics, because, at bottom, it rests on the false claim that in order to transfer heat to a solid body of thermodynamic temperature T, the heat transfer must be proportional to T. Entransy “dissipation” is a number proportional to well known measures of irreversibility such as entropy generation and lost exergy (destroyed available work). Furthermore, the “principle of entransy dissipation minimization” adds nothing to existing work based on minimum entropy generation, minimum thermal resistance, and constructal law. The broader trend illustrated by the entransy hoax is that it is becoming easy to take an existing idea, change the keywords, and publish it as new.

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References

Figures

Grahic Jump Location
Fig. 1

The specific heat of solids versus temperature (drawn after Fig. 3.1 of Ref. [8])

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Fig. 2

Darcy flow on a square domain with low permeability (K) and high permeability (Kp). In time, K grains are searched and replaced by Kp grains such that the overall area-to-point flow access is increased the fastest [15,16]

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Fig. 3

Reference [2] version of Fig. 2: heat conduction on a square domain filled with two materials, low thermal conductivity and high thermal conductivity (drawn after Fig. 4 of Ref. [2])

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Fig. 4

Nonuniform ΔT versus uniform ΔT in heat exchangers (drawn after Fig. 1 of Ref. [18])

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Fig. 5

Two-stream heat exchanger with variable (general) distribution of ΔT [11,19,20]

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