The entransy dissipation minimization principle under given heat duty and heat transfer area conditions

Guo, Jiangfeng; Xu, Mingtian; Cheng, Lin

doi:10.1007/s11434-010-4189-x

Cited by 17 publications

(9 citation statements)

References 19 publications

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“…Cheng et al [60] defined the effectiveness of heat exchanger couple, compared the relationships among entropy generation, entransy dissipation, heat resistance and the effectiveness of heat exchanger couple, and found that only the heat resistance is a monotonic function of the effectiveness of heat exchanger networks. Guo et al [61] proposed the entransy dissipation uniformity principle, applied the entransy dissipation extremum principle into the optimal design of shell tube and plate fin heat exchangers, and discussed the effect of viscous thermal effect in heat exchanger on the entransy dissipation [62][63][64][65][66][67]. The entransy dissipation performance of heat exchanger was further analyzed in [68].…”

Section: Heat Exchangermentioning

confidence: 99%

Progress in entransy theory and its applications

Chen

2012

Chin. Sci. Bull.

115

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The entransy and entransy dissipation extremum principle proposed have opened up a new direction for the heat transfer optimization. The emergence and development of entransy theory are reviewed. Entransy theory and its applications are summarized from several aspects, such as heat conduction, heat convective, heat radiation, heat exchanger design and mass transfer, etc. The emphases are focused on four aspects, i.e., the comparison between entropy generation rate and entransy dissipation rate, the combination of entransy dissipation extreme principle with finite time thermodynamics, the combination of entransy dissipation extreme principle with the heat conduction constructal theory, and the combination of entransy dissipation extreme principle with the heat convective constructal theory. The scientific features of entransy theory are emphasized. Influenced by oil crisis in the 1970's directly, the heat transfer enhancement was world-widely paid attention by the scientific community, and was quickly developed into one of very important branches in thermal science and technology fields. With the progress of social development ideas, such as sustainable development, low-carbon technology and low-carbon economy, the concept of heat transfer enhancement has developed into a broader scope concept of heat transfer optimization [1]. In the past 30 years, the basic theory of heat transfer optimization has been made considerable progresses, and finite-time thermodynamics, field synergy principle, constructal theory as well as entransy theory are the representative achievements. The emergences of these theories promoted the developments of thermodynamics and heat transfer. Finite-time thermodynamics, which combined thermodynamics, heat transfer and fluid mechanics, provided a theoretical fundament for performance optimizations of practical processes and devices with the constraints of a finite size and finite time. Field synergy principle unified the essential physical understandings of convective heat transfer and heat transfer enhancement phenomena, and provided a theoretical fundament for the development of heat transfer enhancement technology to achieve better energy saving effects. Constructal theory, which was called the thermodynamics of non-equilibrium system with configuration in the field of thermal science, provided a theoretical fundament for the unified descriptions of the generation of flow structures in natural organization and the designs of various flow structures. Fourier's law of heat conduction, Newton's law of cooling and Stephen-Boltzmann law of blackbody radiation only gave the concept of heat transfer rate, while the concepts of entransy and entransy dissipation lay the foundation of defining the concept of heat transfer efficiency which did not appear in the heat transfer theory before. Entransy theory provided a new theoretical fundament for heat transfer optimization, which is different from that of the entropy generation minimization.

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Section: Heat Exchangermentioning

confidence: 99%

Progress in entransy theory and its applications

Chen

2012

Chin. Sci. Bull.

115

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“…The effects of heat-transfer fluid influence on heat flow in heat exchangers were studied by Guo et al [14]. They showed that if the heat-transfer fluid is not properly selected the heat transmission and heat exchanger performance are reduced.…”

Section: Introductionmentioning

confidence: 99%

Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps

Adamovský

Neuberger

Adamovský

2015

Energy and Buildings

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“…Chen et al [25] compared the entransy theory with the minimum principle of entropy generation, and showed that the entransy theory could lead to a lower average temperature of the volume than the minimum principle of entropy generation. Other researches also indicate that the entransy theory is suitable for the optimizations of heat conduction [26,27], heat convection [28], thermal radiation [29,30] and heat exchangers [1, [31][32][33][34]. In addition, there is no paradox similar to the entropy generation when the entransy theory is used to analyze heat exchanger [1,32].…”

mentioning

confidence: 99%

Entransy analysis of open thermodynamic systems

2012

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The concept of entransy developed in recent years can describe the heat transport ability. This paper extends this concept to the open thermodynamic system and defines the concept of enthalpy entransy. The entransy balance equation of steady open thermodynamic systems, as well as the concept of entransy loss, is developed. The entransy balance equation is applied to analyzing and discussing the air standard cycle. It is found that the entransy loss rate can describe the change in net power output from the cycle but the entropy generation rate cannot when the heat absorbed by the working medium is from the combustion reaction of the gas fuel. When the working medium is heated by a high temperature stream, both the maximum entransy loss rate and the minimum entropy generation rate correspond to the maximum net power output from the cycle. Hence, the concept of entransy loss is an appropriate figure of merit that describes the cycle performance. As nearly 80% of the total energy consumption is related to heat [1], the optimization design of heat transfer and heatwork conversion has become one of important research topics under the increasing requirements on reducing energy consumption. For instance, the design optimization could improve the performance of heat exchangers and increase heat transfer rate [1]. Optimizing the thermal conductance distribution of the heat exchanger groups could also increase the work output in heat-work conversion [2]. Several theories have been developed for the optimal design of heat transfer and heat-work conversion in recent years [1][2][3][4][5][6][7]. Bejan [4-6] developed the constructal theory and thermodynamic optimizations for heat transfer processes. In heat conduction optimization of the Volume-to-Point problem, Bejan [4] developed the constructal theory, in which the basic, imagined structure of the high conductivity material is given, and the aspect ratio of the structure is optimized through theoretical derivation and numerical simulation to decrease the highest temperature of the heated domain. The sub-structure, third degree structure, etc. are evolved to cover the whole domain. The constructal theory was found to be effective for heat conduction optimization and was extended to heat convection optimizations [8][9][10]. Furthermore, Bejan [4-6] related the optimal heat transfer to the minimum production of entropy generation and extended this idea into other systems. Researchers have done many investigations on heat transfer optimization based on the minimum principle of entropy generation [11,12]. As the objective of this kind of optimization method is to minimize the entropy generation, it is called thermodynamic optimization.However, there are arguments on the constructal theory and thermodynamic optimization in heat transfer [6,[13][14][15][16][17]. Ghodoossi [13,14] applied the constructal theory to analyzing the effect of the complexity levels of the tree network of conducting paths and found that the heat flow performance does not essentially improve if the intern...

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The entransy dissipation minimization principle under given heat duty and heat transfer area conditions

Cited by 17 publications

References 19 publications

Progress in entransy theory and its applications

Progress in entransy theory and its applications

Changes in energy and temperature in the ground mass with horizontal heat exchangers—The energy source for heat pumps

Entransy analysis of open thermodynamic systems

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