Entransy analysis of open thermodynamic systems

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.

[1]  Kyaw Thu,et al.  A second law analysis and entropy generation minimization of an absorption chiller , 2011 .

[2]  Ibrahim Dincer,et al.  An approach to entropy analysis of a latent heat storage module , 2008 .

[3]  Lingai Luo,et al.  Design and scaling laws of ramified fluid distributors by the constructal approach , 2004 .

[4]  XinGang Liang,et al.  Entransy—A physical quantity describing heat transfer ability , 2007 .

[5]  Ning Pan,et al.  A comparison of optimization theories for energy conservation in heat exchanger groups , 2011 .

[6]  Adrian Be Jan.  Constructal-theory network of conducting paths for cooling a heat generating volume , 1997 .

[7]  Dimos Poulikakos,et al.  Efficiency of optimized bifurcating tree-like and parallel microchannel networks in the cooling of electronics , 2009 .

[8]  Adrian Bejan,et al.  Second-Law Analysis in Heat Transfer and Thermal Design , 1982 .

[9]  XueTao Cheng,et al.  Homogenization of temperature field and temperature gradient field , 2009 .

[10]  Wei Liu,et al.  Entransy expression of the second law of thermodynamics and its application to optimization in heat transfer process , 2011 .

[11]  Lotfollah Ghodoossi.  Conceptual study on constructal theory , 2004 .

[12]  A. Bejan.  A Study of Entropy Generation in Fundamental Convective Heat Transfer , 1979 .

[13]  Fengrui Sun,et al.  Heat-conduction optimization based on constructal theory , 2007 .

[14]  Fengrui Sun,et al.  Constructal entransy dissipation minimization for 'volume-point' heat conduction , 2008 .

[15]  XueTao Cheng,et al.  Entransy decrease principle of heat transfer in an isolated system , 2011 .

[16]  Mingtian Xu,et al.  Entransy dissipation minimization for optimization of heat exchanger design , 2011 .

[17]  XueTao Cheng,et al.  Radiative entransy flux in enclosures with non-isothermal or non-grey, opaque, diffuse surfaces and its application , 2011 .

[18]  Govind Maheshwari,et al.  Performance analysis of endoreversible combined Carnot cycles based on new maximum efficient power (MEP) approach , 2010 .

[19]  Liang Xin-gang,et al.  Principles of potential entransy in generalized flow , 2011 .

[20]  A. Bejan,et al.  Fin Geometry for Minimum Entropy Generation in Forced Convection , 1982 .

[21]  Mingtian Xu,et al.  The thermodynamic basis of entransy and entransy dissipation , 2011 .

[22]  Lotfollah Ghodoossi,et al.  Entropy generation rate in uniform heat generating area cooled by conducting paths: criterion for rating the performance of constructal designs , 2004 .

[23]  Wen-Quan Tao,et al.  Effectiveness–thermal resistance method for heat exchanger design and analysis , 2010 .

[24]  Yasin Ust,et al.  The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle , 2011 .

[25]  Liang Xin-gang,et al.  Potential entransy and potential entransy decrease principle , 2011 .

[26]  Liang Xin-Gang,et al.  Microscopic expression of entransy , 2011 .

[27]  Ramesh K. Shah,et al.  Entropy generation extrema and their relationship with heat exchanger effectiveness: Number of transfer unit behavior for complex flow arrangements , 2004 .

[28]  Fengrui Sun,et al.  Constructal entransy dissipation rate minimization for “disc-to-point” heat conduction , 2011 .

[29]  D. Pence,et al.  REDUCED PUMPING POWER AND WALL TEMPERATURE IN MICROCHANNEL HEAT SINKS WITH FRACTAL-LIKE BRANCHING CHANNEL NETWORKS , 2003 .

[30]  Lotfollah Ghodoossi,et al.  Thermal and hydrodynamic analysis of a fractal microchannel network , 2005 .

[31]  Bingjiang Zhang,et al.  An equation of entransy transfer and its application , 2009 .

[32]  Xiaodong Qian,et al.  Analysis of entransy dissipation in heat exchangers , 2011 .

[33]  Jiangfeng Guo,et al.  The entransy dissipation minimization principle under given heat duty and heat transfer area conditions , 2011 .

[34]  Michael J. Moran,et al.  Availability analysis: A guide to efficient energy use , 1982 .

[35]  Ning Pan,et al.  Optimization principles for convective heat transfer , 2009 .

[36]  XueTao Cheng,et al.  Entransy flux of thermal radiation and its application to enclosures with opaque surfaces , 2011 .

[37]  Fengrui Sun,et al.  Optimization for entransy dissipation minimization in heat exchanger , 2009 .

[38]  A. S. Adavbiele,et al.  Optimization of Thermofluid Systems with Second Law , 2010 .

[39]  Hongye Zhu,et al.  An alternative criterion in heat transfer optimization , 2011, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[40]  John H. Lienhard,et al.  Effect of entropy generation on the performance of humidification-dehumidification desalination cycles , 2010 .