PERFORMANCE OPTIMIZATION OF PLATE-FIN HEAT EXCHANGERS USED IN A THREE STAGE PROPANE PRE-COOLING CYCLE OF THE CASCADE LNG PLANT

2017 ◽  
Author(s):  
Ali Allahyarzadeh-Bidgoli ◽  
Daniel Jonas Dezan ◽  
Jurandir Itizo Yanagihara
Keyword(s):  
Performance Optimization ◽  
Heat Exchangers ◽  
Cooling Cycle

Performance Optimization of Compact Ceramic High Temperature Heat Exchangers

2007 ◽  
Author(s):  
Q. Y. Chen ◽  
M. Zeng ◽  
D. H. Zhang ◽  
Q. W. Wang
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchanger ◽  
Performance Optimization ◽  
Heat Exchangers ◽  
Radiation Heat Transfer ◽  
Surface Radiation ◽  
Radiation Heat ◽  
High Temperature Side ◽  
Temperature Heat

In the present paper, the compact ceramic high temperature heat exchangers with parallel offset strip fins and inclined strip fins (inclined angle β = 0∼70°) are investigated with CFD method. The numerical simulations are carried out for high temperature (1500°C), without and with radiation heat transfer, and the periodic boundary is used in transverse direction. The fluid of high temperature side is the standard flue gas. The material of heat exchanger is SiC. NuS-G.R(with surface and gaseous radiation heat transfer) is averagely higher than NuNo.R (without radiation heat transfer) by 7% and fS-G.R is averagely higher than fNo.R by 5%. NuS-G.R(with surface and gaseous radiation heat transfer) is averagely higher than NuS.R (with only surface radiation heat transfer) by 0.8% and fS-G.R is averagely higher than fS.R by 3%. The thermal properties have significantly influence on the heat transfer and pressure drop characteristics, respectively. The heat transfer performance of the ceramic heat exchanger with inclined fins (β = 30°) is the best.

Thermodynamic performance optimization of a combined power/cooling cycle

2010 ◽  
Vol 51 (1) ◽  
pp. 204-211 ◽  
Author(s):  
M. Pouraghaie ◽  
K. Atashkari ◽  
S.M. Besarati ◽  
N. Nariman-zadeh
Keyword(s):  
Performance Optimization ◽  
Cooling Cycle ◽  
Thermodynamic Performance

COP optimization of propane pre-cooling cycle by optimal Fin design of heat exchangers: Efficiency and sustainability improvement

2020 ◽  
Vol 271 ◽  
pp. 122585
Author(s):  
Ali Allahyarzadeh-Bidgoli ◽  
Daniel Jonas Dezan ◽  
Jurandir Itizo Yanagihara
Keyword(s):  
Heat Exchangers ◽  
Cooling Cycle ◽  
Fin Design

Performance Optimization for a Multielement Thermoelectric Refrigerator with Linear Phenomenological Heat Transfer Law

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Lingen Chen ◽  
Fankai Meng ◽  
Yanlin Ge ◽  
Huijun Feng
Keyword(s):  
Heat Transfer ◽  
Performance Optimization ◽  
Heat Exchangers ◽  
Thermal Conductance ◽  
Electrical Current ◽  
Coefficient Of Performance ◽  
Junction Temperature ◽  
Thomson Effect ◽  
Electrical Currents ◽  
Temperature Solution

AbstractA model of a multielement thermoelectric refrigerator with another linear heat transfer law, the linear phenomenological heat transfer law Q\propto \Delta (1/T), is established. The refrigerating capacity and coefficient of performance (COP) are analyzed and optimized. The junction temperature solution equations are derived. The optimum electrical currents and thermal conductance allocation are discussed. The influences of thermoelectric element quantity and refrigerating temperature difference on the optimum performances and optimum electrical currents are analyzed. The results show that different optimization objectives have different requirements for the distribution of electrical current and thermal conductance. The refrigeration capacity is not proportional to the number of thermoelectric elements. It is found that the refrigerating capacity can be achieved only when the number of thermoelectric elements is matched for fixed external heat exchangers. The input electrical current and the allocation of the thermal conductance between the two heat exchangers can be optimized synchronously to achieve maximum refrigerating capacity or maximum COP. Performance is compared with that with a Newtonian heat transfer law. The influences of the Thomson effect are also examined. Performance of the refrigerator with Newtonian heat transfer law is higher than that of the refrigerator with linear phenomenological heat transfer law. The Thomson effect can improve the performance of the refrigerator.

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