Do We Really Need “Entransy”? A Critical Assessment of a New Quantity in Heat Transfer Analysis

[+] Author and Article Information
H. Herwig

Hamburg University of Technology,
Hamburg, Germany
e-mail: h.herwig@tuhh.de

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 8, 2013; final manuscript received November 18, 2013; published online February 18, 2014. Assoc. Editor: Oronzio Manca.

J. Heat Transfer 136(4), 045501 (Feb 18, 2014) (4 pages) Paper No: HT-13-1403; doi: 10.1115/1.4026188 History: Received August 08, 2013; Revised November 18, 2013

Recently, a group of scientists introduced a new quantity for the analysis of heat transfer problems. They called it entransy since according to their understanding it is both, an indication of the nature of energy as well as that of the heat transfer ability. This concept is critically assessed on the background of two questions: Is entransy as an extension of the well established theory of heat transfer consistent with this classical approach? And: Is there a real need for the extension of the classical theory by introducing entransy as a quantity that was missing in the past?

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Topics: Heat transfer , Heat
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McCann, H. G., 1978, Chemistry Transformed: The Paradigmatic Shift from Phlogiston to Oxygen, Ablex Publishing Corporation, Norwood, NJ.
Chen, Q., Liang, X.-G., and Guo, Z.-Y., 2011, “Entransy—A Novel Theory in Heat Transfer Analysis and Optimization,” Developments in Heat Transfer, M. A.dos Santos Bernardes, ed., InTech, Rijeka, Croatia, (HR), pp. 349–372.
Guo, Z.-Y., Zhu, H.-Y., and Liang, X.-G., 2007, “Entransy—A Physical Quantity Describing Heat Transfer Ability,” Int. J. Heat Mass Transfer, 50(13, 14), pp. 2545–2556. [CrossRef]
Xu, M., 2011, “Entransy Dissipation Theory and its Application in Heat Transfer,” Developments in Heat Transfer, M. A.dos Santos Bernardes, ed., InTech, Rijeka, Croatia, (HR), pp. 247–272.
Guo, Z., Cheng, X., and Xia, Z., 2003, “Least Dissipation Principle of Heat Transport Potential Capacity and its Application in Heat Conduction Optimization,” Chin. Sci. Bull., 48(4), pp. 406–410. [CrossRef]
Chen, Q., and Xu, Y.-C., 2012, “An Entransy Dissipation-Based Optimization Principle for Building Central Chilled Water Systems,” Energy, 37(1), pp. 571–579. [CrossRef]
Guo, J., and Xu, M., 2012, “The Application of Entransy Dissipation Theory in Optimization Design of Heat Exchanger,” Appl. Therm. Eng., 36, pp. 227–235. [CrossRef]
Guo, J., and Huai, X., 2012, “Optimization Design of Recuperator in a Chemical Heat Pump System Based on Entransy Dissipation Theory,” Energy, 41(1), pp. 335–343. [CrossRef]
Xu, Y.-C., and Chen, Q., 2012, “An Entransy Dissipation-Based Method for Global Optimization of District Heating Networks,” Energy Build., 48, pp. 50–60. [CrossRef]
Xu, M., 2012, “Variational Principles in Terms of Entransy for Heat Transfer,” Energy, 44(1), pp. 973–977. [CrossRef]
Cheng, X., and Liang, X., 2012, “Entransy Loss in Thermodynamic Processes and its Application,” Energy, 44(1), pp. 964–972. [CrossRef]
Cheng, X., and Liang, X., 2012, “Optimization Principles for Two-Stream Heat Exchangers and Two-Stream Heat Exchanger Networks,” Energy, 46(1), pp. 386–392. [CrossRef]
Cheng, X., and Liang, X., 2012, “Heat-Work Conversion Optimization of One-Stream Heat Exchanger Networks,” Energy, 47(1), pp. 421–429. [CrossRef]
Chen, L., Xiao, Q., Xie, Z., and Sun, F., 2012, “T-Shaped Assembly of Fins With Constructural Entransy Dissipation Rate Minimization,” Int. Commun. Heat Mass Transfer, 39(10), pp. 1556–1562. [CrossRef]
Xu, M., 2011, “The Thermodynamic Basis of Entransy and Entransy Dissipation,” Energy, 36(7), pp. 4272–4277. [CrossRef]
Zhou, S., Chen, L., Sun, F., and Wu, C., 2002, “Cooling Load Density Optimization of an Irreversible Simple Brayton Refrigerator,” Open Syst. Inf. Dyn., 9, pp. 325–337. [CrossRef]
Tu, Y., Chen, L., Sun, F., and Wu, C., 2006, “Cooling Load and Coefficient of Performance Optimizations for Real Air-Refrigerators,” Appl. Energy, 83, pp. 1289–1309. [CrossRef]
Lucia, U., 2013, “Stationary Open Systems: A Brief Review on Contemporary Theories on Irreversibility,” Physica A, 392(5), pp. 1051–1062. [CrossRef]
Grazzini, G., Borchiellini, R., and LuciaU., 2013, “Entropy Versus Entransy,” J. Non-Equilib. Thermodyn., 38(3), pp. 259–271. [CrossRef]
Popper, K. R., 1984, Logik der Forschung, Mohr-Verlag, Tuebingen, Germany.
Herwig, H., 2007, “Die Irreführende Verwendung der Thermodynamischen Größe Enthalpie: Ein Didaktischer Sündenfall,” Forsch. Ingenieurwes., 71, pp. 107–112. [CrossRef]
Moran, H., and Shapiro, H., 2003, Fundamentals of Engineering Thermodynamics, 5th ed., John Wiley & Sons, New York.
Lucia, U., 2013, “Entropy and Exergy in Irreversible Renewable Energy Systems,” Renewable Sustainable Energy Rev., 20(1), pp. 559–564. [CrossRef]
Bejan, A., 2006, Advanced Engineering Thermodynamics, 3rd ed., Wiley, Hoboken, NJ.
Bejan, A., 1982, Entropy Generation through Heat and Fluid Flow, Wiley, New York.
Bejan, A., 1996, “Entropy Generation Minimization: The New Thermodynamics of Finite-Size Devices and Finite-Time Processes,” J. Appl. Phys., 79, pp. 1191–1218. [CrossRef]
Bejan, A., Tsatsatronis, A., and Moran, M., 1996, Thermal Design and Optimization, Wiley, New York.
Bajan, A., and Lorente, S., 2010, “The Constructal Law of Design and Evolution in Nature,” Philos. Trans. R. Soc. B, 365, pp. 1335–1347. [CrossRef]
Lucia, U., 1995, “Mathematical Consequences and Gyarmati's Principle in Rational Thermodynamics,” Il Nuovo Cimento B, 110(10), pp. 1227–1235. [CrossRef]
Lucia, U., 2008, “Probability, Ergodicity, Irreversibility and Dynamical Systems,” Proc. R. Soc. A, 464, pp. 1089–1184. [CrossRef]
Lucia, U., 2012, “Maximum or Minimum Entropy Generation for Open Systems?,” Physica A, 391(12), pp. 3392–3398. [CrossRef]
Lucia, U., 2012, “Entropy Generation in Technical Physics,” Kuwait J. Sci. Eng., 39(2A), pp. 91–101.
Lucia, U., 2013, “Carnot Efficiency: Why?,” Physica A, 392(17), pp. 3513–3517. [CrossRef]
Lucia, U., and Sciubba, E., 2013, “From Lotka to the Entropy Generation Approach,” Physica A, 392(17), pp. 3634–3639. [CrossRef]
Lucia, U., 2013, “Thermodynamic Paths and Stochastic Order in Open Systems,” Physica A, 392(18), pp. 3912–3919. [CrossRef]
Lucia, U., 2013, “Entropy Generation: From Outside to Inside!,” Chem. Phys. Lett., 583, pp. 209–212. [CrossRef]
Lucia, U., 2013, “Exergy Flows as Bases of Constructal Law,” Physica A, 392(24), pp. 6284–6287. [CrossRef]
Chen, Q., Zhu, H. Y., and Guo, Z. Y., 2011, “An Alternative Criterion in Heat Transfer Optimization,” Proc. R. Soc. A: Math. Phys. Eng. Sci., 467, pp. 1012–1028. [CrossRef]
Herwig, H., 2011, “The Role of Entropy Generation in Momentum and Heat Transfer,” ASME J. Heat Transfer, 134, p. 031003. [CrossRef]


Grahic Jump Location
Fig. 1

Forms of energy (state variables) and energy transport (process variables) with respect to a thermodynamic system, here: closed system, i.e., no transport eδm

Grahic Jump Location
Fig. 2

Entropy change δQs and entropy generation δirrs due to an energy transfer in form of heat out of (a) and into (b) a thermodynamic system



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