Discussion: “Entransy is Now Clear”

Abstract

The purpose of this discussion is to place in perspective the concept of entransy, in view of the critiques published by Grazzini et al. (2013, “Entropy Versus Entransy,” J. Non-Equilib. Thermodyn., 38, pp. 259–271), Herwig (2014, “Do We Really Need ‘Entransy’? A Critical Assessment of a New Quantity in Heat Transfer Analysis,” ASME J. Heat Trans., 136(4), 045501), and Bejan 2014, ““Entransy,” and Its Lack of Content in Physics,” ASME J. Heat Trans., 136(5), 055501), and especially the response just published by Guo et al. (2014, “A Response to Do We Really Need ‘Entransy’?” ASME J. Heat Trans., 136(4), 046001). The conclusion is that entransy is improper and not needed, and that Guo et al.'s own response actually confirms this conclusion.

Entransy dissipation-based constraint for optimization of heat exchanger networks in thermal systems

“…There has been much discussion about entransy theory in recent years. Herwig [43], Bejan [44], Grazzini et al [45], and Awad [46,47] questioned the entransy concept, but ignored our responses published in the same issue [48e51]. We welcome discussion of our work and hope that our colleagues can get a better understanding of entransy theory and many successful applications.…”

Heatlines (1983) versus synergy (1998)

“…On that basis our letter was published [27]. (ii) Six independent papers in a single year [28][29][30][31][32][33] in a heat exchanger [35] was published 23 years earlier (and in general form) in Ref. [36].…”

Reply to “Entransy unmasked” by Awad

“…[11], Herwig presented an assessment of entransy and listed some questions about the entransy theory. Awad [12] also published a comment paper on the entransy theory, repeating the words of Bejan, Herwig and Grazzini et al, nothing more. The questions and criticisms in Refs.…”

“…The T 2 was not determined arbitrarily as was believed by Awad [1] and Bejan [10]. The origin of entransy by the analogy and derivation from energy conservation and some advantages in heat transfer optimization [4,22] have been shown clearly even though they were denied by Awad [1,12], Grazzini et al [7,13], Lucia [8], Bejan [9,10] and Herwig [11], who do not accept the differences between entransy and entropy [22,23] and disregard the significant differences in the optimization results from the two methods. However, the different results obtained from the two methods demonstrate that they are not the same and have different objectives [20,22].…”