Application of entransy to optimization design of parallel thermal network of thermal control system in spacecraft

For distribution optimization of the flow rate of cold fluid and heat transfer area in the parallel thermal network of the thermal control system in spacecraft, a physical and mathematical model is set up, analyzed and discussed with the entransy theory. It is found that the optimization objective of this problem and the optimization direction of the extremum entransy dissipation principle are consistent in theory. For a two-branch thermal network system, the distributions of the flow rate of the cold fluid and the heat transfer area are optimized by calculating the extremum entransy dissipation with the Newton method. The influential factors of the optimized distributions are also analyzed and discussed. The results show that the main influence factors are the heat transfer rate of the branches and the total heat transfer area. The total flow rate of the cold fluid has a threshold, beyond which further increasing its value brings very little influence on the optimization results. Moreover, the difference between the extremum entransy dissipation principle and the minimum entropy generation principle is also discussed when they are used to analyze the problem in this paper, and the extremum entransy dissipation principle is found to be more suitable. In addition, the Newton method is mathematically efficient to solve the problem, which could accomplish the optimized distribution in a very short time for a ten-branch thermal network system.

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

[2]  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 .

[3]  Fengrui Sun,et al.  Constructal optimization for a solid-gas reactor based on triangular element , 2008 .

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

[5]  A. Bejan.  Constructal-theory network of conducting paths for cooling a heat generating volume , 1997 .

[6]  XinGang Liang,et al.  Application of entransy dissipation extremum principle in radiative heat transfer optimization , 2008 .

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

[8]  Larry D. Turner,et al.  Preliminary design of the Space Station internal thermal control system , 1987 .

[9]  Brien Johnson,et al.  Development of the Internal Thermal Control System (ITCS) for International Space Station (ISS) , 2001 .

[10]  Fengrui Sun,et al.  Constructal entransy dissipation minimization of an electromagnet , 2009 .

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

[12]  Lingen Chen,et al.  Finite Time Thermodynamic Optimization or Entropy Generation Minimization of Energy Systems , 1999 .

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

[14]  Chengyun Xin,et al.  POTENTIAL CAPACITY DISSIPATION MINIMIZATION AND ENTROPY GENERATION MINIMIZATION IN HEAT CONDUCTION OPTIMIZATION , 2005 .

[15]  Qun Chen,et al.  Generalized thermal resistance for convective heat transfer and its relation to entransy dissipation , 2008 .

[16]  Fengrui Sun,et al.  Constructal optimization for geometry of cavity by taking entransy dissipation minimization as objective , 2009 .

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

[18]  Qi Guo,et al.  Design of a novel optically stimulated luminescent dosimeter using alkaline earth sulfides doped with SrS:Eu,Sm materials , 2008 .

[19]  Chengyun Xin.  POTENTIAL CAPACITY DISSIPATION EXTREMUM AND ENTROPY GENERATION MINIMIZATION IN LAMINAR CONVECTIVE HEAT TRANSFER , 2006 .

[20]  Ren Jianxun.  Optimization of the thermal network in parallel connection of manned spacecraft , 2002 .

[21]  A. Bejan,et al.  Entropy Generation Through Heat and Fluid Flow , 1983 .

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

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

[24]  Fengrui Sun,et al.  “Volume-Point” heat conduction constructal optimization with entransy dissipation minimization objective based on rectangular element , 2008 .

[25]  Liu Xiong-Bin,et al.  A novel method for heat exchanger analysis , 2009 .

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

[27]  Zeng-Yuan Guo,et al.  Entropy generation extremum and entransy dissipation extremum for heat exchanger optimization , 2009 .

[28]  Fengrui Sun,et al.  Entransy dissipation minimization for liquid-solid phase change processes , 2010 .

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

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

[31]  Xinguang Cheng,et al.  Least dissipation principle of heat transport potential capacity and its application in heat conduction optimization , 2003 .

[32]  Mingtian Xu,et al.  Entransy dissipation number and its application to heat exchanger performance evaluation , 2009 .