Field synergy analysis and optimization of decontamination ventilation designs

Chen, Qun; Ren, Jing; Guo, Zeng-Yuan

doi:10.1016/j.ijheatmasstransfer.2007.04.004

Cited by 81 publications

(36 citation statements)

References 13 publications

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“…Based on the analogy between mass transfer and heat transfer phenomenon and analogy to the definition of entransy dissipation function of heat transfer, Chen et al [15,[74][75][76][77] introduced the concept of mass entransy to describe the ability to transfer mass outside of an object, and defined the mass entransy dissipation function:…”

Section: Mass Transfermentioning

confidence: 99%

“…Chen et al [74][75][76][77] proposed the mass entransy dissipation (ever interpreted as mass transfer potential capacity dissipation function in [74]) extremum principle, and optimized various processes, such as laminar mass transfer [74], photocatalytic oxidation reactor, space station ventilation [76,77] and evaporative cooling systems [78][79][80], etc. Chen et al [81] proposed the moisture resistance method for liquid desiccant performance analysis and optimization.…”

Section: Mass Transfermentioning

confidence: 99%

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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: Mass Transfermentioning

confidence: 99%

Section: Mass Transfermentioning

confidence: 99%

Progress in entransy theory and its applications

Chen

2012

Chin. Sci. Bull.

115

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“…The extremum principle of entransy dissipation was used in optimization of heat conduction [36][37][38][39][40], heat convection [41][42][43][44][45], radiative heat transfer [46] and heat exchanger [47][48][49][50][51][52]. The extremum principle of mass entransy dissipation and its application have also been discussed [53,54]. However, a generalized conception of entransy to describe the heat and mass transfer ability is expected.…”

Section: Introductionmentioning

confidence: 99%

Constructal optimization of discrete and continuous-variable cross-section conducting path based on entransy dissipation rate minimization

Wei

Chen

Sun

2010

Sci. China Technol. Sci.

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Using constructal entransy dissipation rate minimization method based on discrete variable cross-section conducting path, constructal optimizations of elemental area with variable cross-section conducting path are performed, and the results are compared with the optimization results of elemental area with the constant cross-section conducting path. The comparison shows that the minimum mean temperature difference based on elemental area with variable cross-section conducting path increases and approaches a constant as the assembly's order increases, but the minimum mean temperature difference based on elemental area with constant cross-section conducting path decreases and approaches a constant as the assembly's order increases. The difference between them is caused by the different dimensionless mean temperature difference of the first order assembly. A universal constructal optimization method by self similar organization to improve heat transfer ability and its corresponding rule are proposed. With the constructal optimization method by self similar organization based on entransy dissipation rate minimization objective, the mean temperature difference approaches a constant as the assembly's order increases.constructal theory, entransy, entransy dissipation, area-point conduction, generalized thermodynamic optimization Citation:Wei S H, Chen L G, Sun F R. Constructal optimization of discrete and continuous-variable cross-section conducting path based on entransy dissipation rate minimization.

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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.…”

mentioning

confidence: 99%

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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Field synergy analysis and optimization of decontamination ventilation designs

Cited by 81 publications

References 13 publications

Progress in entransy theory and its applications

Progress in entransy theory and its applications

Constructal optimization of discrete and continuous-variable cross-section conducting path based on entransy dissipation rate minimization

Relationship between microstate number and available entransy

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