Constructal entransy dissipation minimisation for 'volume-point' heat conduction without the premise of optimised last-order construct

Wei, Shuhuan; Chen, Lingen; Sun, Fengrui

doi:10.1504/ijex.2010.034933

Cited by 45 publications

(30 citation statements)

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“…Then, Guo et al [11] proposed the extremum entransy dissipation principle for optimizing heat transfer processes where the extremum entransy dissipation corresponds to the optimal heat transfer performance when a thermodynamic cycle is not involved. This new principle has been applied to optimizing heat conduction [11][12][13][14][15][16][17][18][19], convective heat transfer [20][21][22][23], thermal radiation [24] processes and the heat transfer in heat exchanger [25][26][27][28][29][30][31][32][33], with all the studies confirming that the optimal results can be obtained based on the extremum entransy dissipation principle.…”

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confidence: 74%

Analysis of condenser shell side pressure drop based on the mechanical energy loss

Zeng

Jiang

2012

Chin. Sci. Bull.

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The condenser performance is strongly affected by the tube arrangement. The steam pressure drop in the tube bundle influences the condenser back pressure, which is an important indicator of the condenser performance used to compare different condenser tube arrangements. The condenser shell side pressure drop is studied here using the mechanical energy loss of the steam flow in the condensers. The mechanical energy loss is due to the flow resistance of the tube bundle and the steam condensation. Three typical tube arrangements are analyzed numerically. The results show that a higher condenser shell side pressure drop for different tube arrangements always corresponds to a larger mechanical energy loss. The mechanical energy loss is mainly in the periphery of the tube bundle, indicating that the flow pattern and the mechanical energy losses are markedly determined by the tube bundle profile. The condenser shell side pressure drop can be reduced by reducing the total mechanical energy loss when the steam enters the tube bundle more uniformly. Thus, a well designed tube arrangement will reduce the mechanical energy loss, and also the shell side pressure drop.power plant condenser, tube arrangement, shell side pressure drop, mechanical energy loss Citation:Zeng H, Meng J A, Li Z X. Analysis of condenser shell side pressure drop based on the mechanical energy loss.

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confidence: 74%

Analysis of condenser shell side pressure drop based on the mechanical energy loss

Zeng

Jiang

2012

Chin. Sci. Bull.

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“…The minimum entransy-dissipation-based thermal resistance principle indicates that smaller thermal resistance leads to better heat transfer performance. These principles of the entransy theory have found applications in optimizing heat conduction (4,(28)(29)(30)(31)(32) , heat convection (4,27,(33)(34)(35) , thermal radiation (36,37) and the design of heat exchangers (12,13,15,38,39) and heat exchangers networks (14,15) , and no paradox similar to the entropy generation paradox is noticed up to now (12,13,15,38) .…”

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confidence: 99%

Entransy, Entransy Dissipation and Entransy Loss for Analyses of Heat Transfer and Heat-Work Conversion Processes

Cheng

Liang

2013

JTST

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Entransy is a parameter proposed in recent years to describe the potential of heat in an object. Its balance equation was established based on the energy equation of heat transfer, which contains entransy, entransy flow, entransy dissipation and entransy production due to heat source. It has been proved that the total entransy must be reduced whenever there is heat transfer in an isolated system, leading to entransy dissipation. Entransy dissipation and entransy-based thermal resistance can be used to optimize heat conduction, heat convection, thermal radiation and the design of heat exchangers and heat exchanger networks. On the other hand, the entransy balance equation was also established for heat-work conversion processes. With the equation, entransy loss, which is the difference between the input and output heat entransy flows, was defined and related to thermodynamic processes. For the discussed thermodynamic cycles, it was found that larger entransy loss leads to larger output work.

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“…Based on the concept of entransy dissipation, Guo et al [4] developed the extremum entransy dissipation principle, defined the entransy-dissipation-based thermal resistance, and proposed the minimum thermal resistance principle. It was found that the principles of the entransy theory are appropriate to the optimization of heat conduction [5][6][7][8][9][10][11][12][13], heat convection [14][15][16][17], thermal radiation, design of heat exchangers [21][22][23][24][25][26][27] and phase change heat transfer processes [28]. Eqs.…”

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confidence: 99%

“…where U 1 and U 2 are the initial internal energies subsystems 1 and 2, U 10 and U 20 are the internal energies of the subsystems at the cold source temperature (which are equal). When the system reaches thermal equilibrium, eq a conv eq 0 0 0 …”

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Relationship between microstate number and available entransy

Cheng

Liang

2012

Chin. Sci. Bull.

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Based on the relationship between entransy and microstate number, we discuss the variations of the available transport entransy, the unavailable transport entransy, the available conversion entransy and the unavailable conversion entransy with the microstate number. We focus on physical processes in which heat is used for heating/cooling or doing work. When heat is transported for heating or cooling, the available transport entransy increases if the increase in microstate number is due to the increase in internal energy of the system, and decreases if the increase in microstate number is due to spontaneous heat transfer. When heat is used to do work, both the available conversion entransy and the unavailable conversion entransy increase if the increase in microstate number relates to the growth in internal energy of the system. The available conversion entransy decreases and the unavailable conversion entransy increases if the increase in microstate number results from spontaneous heat transfer. microstate number, entransy, available entransy, unavailable entransy

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Constructal entransy dissipation minimisation for 'volume-point' heat conduction without the premise of optimised last-order construct

Cited by 45 publications

References 0 publications

Analysis of condenser shell side pressure drop based on the mechanical energy loss

Analysis of condenser shell side pressure drop based on the mechanical energy loss

Entransy, Entransy Dissipation and Entransy Loss for Analyses of Heat Transfer and Heat-Work Conversion Processes

Relationship between microstate number and available entransy

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