Thermo-economic optimization of superheating and sub-cooling heat exchangers in vapor-compressed refrigeration system

2008 ◽  
Vol 32 (7) ◽  
pp. 634-647 ◽  
Author(s):  
Mehmet Özkaymak ◽  
Huseyin Kurt ◽  
Ziyaddin Recebli
Keyword(s):  
Heat Exchangers ◽  
Refrigeration System ◽  
Economic Optimization

scholarly journals FREON COOLING MINISYSTEM USING CIRCULAR MICRO-CHANNELS

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
LILIANA PĂTULEANU ◽  
IOAN-COZMIN MANOLACHE-RUSU ◽  
TIBERIU BURDAN ◽  
FLORIN ANDRONIC ◽  
IVAN RADION
Keyword(s):  
Processing Speed ◽  
Heat Exchangers ◽  
Mechanical Compression ◽  
Refrigeration System ◽  
Electronic Components ◽  
Local Cooling ◽  
New Methods ◽  
Micro Channels ◽  
Nano Channel ◽  
Set Up

<p>The necessity of a higher data processing speed was crucial for the advances in computer science. There were created processors that needed increasingly more power, so that new methods were discovered and more complex systems were created in order to solve the cooling issue. In this paper, there are presented the trials performed on a mini refrigeration plant that used mechanical compression of Freon’s, designed to cool electronic components like microprocessors, microcontrollers, graphic stations, or in the case of local cooling in diverse areas such as bioengineering, optics and nanotechnologies. The refrigeration system was constructed as an experimental set-up and consists of the following: two mini heat exchangers, working both as a condenser and a vaporizer, which are made of circular micro channels, a refrigeration compressor, lamination valve which contains a circular nano channel and a micro filter. The experimental determinations have proven that, although such a system contains a small quantity of Freon, of the order of milligrams, it reaches temperatures of -44 °C.</p>

Economic Optimization of Shell and Tube Heat Exchanger Based on Constructal Theory

2010 ◽  
Author(s):  
Majid Amidpour ◽  
Abazar Vahdat Azad
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Constructal Theory ◽  
Economic Optimization ◽  
Total Cost ◽  
Tube Heat Exchanger ◽  
Capital Costs ◽  
Operational Energy ◽  
Shell And Tube

In this paper, the new approach of Constructal theory has been employed to design shell and tube heat exchangers. Constructal theory is a new method for optimal design in engineering applications. The purpose of this paper is optimization of shell and tube heat exchangers by reduction of total cost of the exchanger using the constructal theory. The total cost of the heat exchanger is the sum of operational costs and capital costs. The overall heat transfer coefficient of the shell and tube heat exchanger is increased by the use of constructal theory. Therefore, the capital cost required for making the heat transfer surface is reduced. Moreover, the operational energy costs involving pumping in order to overcome frictional pressure loss are minimized in this method. Genetic algorithm is used to optimize the objective function which is a mathematical model for the cost of the shell and tube heat exchanger and is based on constructal theory. The results of this research represent more than 50% reduction in costs of the heat exchanger.

An Extension to the Irreversibility Minimization Analysis Applied to Heat Exchangers

1989 ◽  
Vol 111 (1) ◽  
pp. 29-36 ◽  
Author(s):  
S. Aceves-Saborio ◽  
J. Ranasinghe ◽  
G. M. Reistad
Keyword(s):  
Heat Exchanger ◽  
Optimal Design ◽  
Heat Exchangers ◽  
The Other ◽  
Exergetic Efficiency ◽  
Economic Optimization ◽  
Minimization Method ◽  
Other Hand

The irreversibility minimization method of heat exchanger optimization is extended to include a term to account for the exergy of the material of construction of the heat exchanger. The method permits physically realistic optimization to be conducted with the resulting optimum designs providing conceptually beneficial guideposts, which do not change with time or location. Such optima are in contrast to the optima obtained by presently advocated methods, which on one hand indicate unrealistic infinite area heat exchangers, and on the other hand point to optima that may change dramatically with location and time. Although the analysis presented here does not represent a “cure-all” for heat exchanger analysis (economic optimization is still recommended), it does provide valuable conceptual insights and nonchanging guideposts for optimal design. Accompanying exergetic efficiency expressions using the same type of material exergy term show physically more realistic values than the usual expressions.

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