Thermodynamic optimization of ground heat exchangers with single U-tube by entropy generation minimization method

2013 ◽  
Vol 65 ◽  
pp. 133-139 ◽  
Author(s):  
Min Li ◽  
Alvin C.K. Lai
Keyword(s):  
Entropy Generation ◽  
Heat Exchangers ◽  
Thermodynamic Optimization ◽  
Minimization Method ◽  
Entropy Generation Minimization ◽  
Ground Heat Exchangers

Entropy Analysis of a R32/CO2 Cascade Refrigeration Cycle

2014 ◽  
Vol 672-674 ◽  
pp. 1676-1679
Author(s):  
Jian Xiao ◽  
Ying Fu Liu
Keyword(s):  
Entropy Generation ◽  
Temperature Difference ◽  
Design Parameters ◽  
Refrigeration Cycle ◽  
Total Entropy ◽  
Entropy Analysis ◽  
Minimization Method ◽  
Entropy Generation Minimization ◽  
Cascade Refrigeration

In order to study the performance of a R32/CO2 cascade refrigeration cycle, entropy generation minimization method was adopted to get the influence of some important operating and design parameters on the performance of the system and entropy generations of each component and the whole system, such as the evaporating temperature(Te), the condensing temperature(Tk) and the temperature difference in the cascade condenser(ΔT). The results indicate that there are a maximum COP and a minimum total entropy generation of the system at the optimal condensing temperature of the cascade condenser when Te, Tk and ΔT are constant. The total entropy generations of the throttling device, the condenser and the compressor of HTC, the cascade condenser and the compressor of LTC are above 80% of the total entropy generation of the whole system.

Application of the entropy generation minimization method to solid mechanics

2009 ◽  
Vol 97 (4) ◽  
pp. 777-789 ◽  
Author(s):  
Mehdi Baneshi ◽  
Khosrow Jafarpur ◽  
Mojtaba Mahzoon
Keyword(s):  
Entropy Generation ◽  
Solid Mechanics ◽  
Minimization Method ◽  
Entropy Generation Minimization

scholarly journals Numerical Analysis of Flow Field and Heat Transfer of 2D Wavy Ducts and Optimization by Entropy Generation Minimization Method

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Ouldouz Nourani Zonouz ◽  
Mehdi Salmanpour
Keyword(s):  
Heat Transfer ◽  
Flow Field ◽  
Entropy Generation ◽  
Wave Number ◽  
Working Fluid ◽  
Finite Volume Scheme ◽  
Computational Domain ◽  
Minimization Method ◽  
Entropy Generation Minimization ◽  
Temperature Boundary

This article provided a research for the trend of heat transfer and flow field through a 2-dimensional wavy duct. To construct a grid mesh, the physical domain was transferred to the computational domain and finite volume scheme was used for discretizing the governing equations. Through the simulation, the flow regime stayed in laminar mode. Constant temperature boundary condition has been used for solid walls. Air was used as a working fluid. Existence of waves makes some phenomenon like flow separation. Effect of Reynolds number, wave width, and wave number has been analyzed and velocity distribution, heat transfer coefficient, and tangential stress were computed for different cases. The final results were compared with the same straight duct. The entropy generation minimization method has been used for better comparison between final results.

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