Simulation and Optimization of the Heat Exchanger for Automotive Exhaust-Based Thermoelectric Generators

2015 ◽  
Vol 45 (3) ◽  
pp. 1464-1472 ◽  
Author(s):  
C. Q. Su ◽  
C. Huang ◽  
Y. D. Deng ◽  
Y. P. Wang ◽  
P. Q. Chu ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Thermoelectric Generators ◽  
Automotive Exhaust ◽  
Simulation And Optimization

Numerical optimization of obstructed high temperature heat exchanger for recovery from the flue gases by considering ash fouling characteristics

2019 ◽  
Vol 30 (5) ◽  
pp. 2273-2303
Author(s):  
Ali Akbar Abbasian Arani ◽  
Ali Arefmanesh ◽  
Hamidreza Ehteram
Keyword(s):  
Heat Exchanger ◽  
Particle Dispersion ◽  
Flue Gases ◽  
Dispersion Modeling ◽  
Discrete Phase Model ◽  
Side Plate ◽  
Content Type ◽  
Simulation And Optimization ◽  
Ash Fouling ◽  
Fouling Characteristics

Purpose The purpose of this paper is to recommend a validated numerical model for simulation the flue gases heat recovery recuperators. Due to fulfill of this demand, the influences of ash fouling characteristics during the transient/steady-state simulation and optimization of a 3D complex heat exchanger equipped with inner plain fins and side plate fins are studied. Design/methodology/approach For the particle dispersion modeling, the discrete phase model is applied and the flow field has been solved using SIMPLE algorithm. Findings According to obtained results, for the recuperator equipped with combine inner plain and side plate fins, determination of ash fouling characteristics is really important, effective and determinative. It is clear that by underestimating the ash fouling characteristics, the achieved results are wrong and different with reality. Originality/value Finally, the configuration with inner plain fins with characteristics of: di =5 mm, do = 6 mm, dg = 2 mm, dk = 3 mm and NIPFT = 9 and side plate fins with characteristics of: TF = 3 mm, PF = 19 mm, NSPF = 17·2 = 34, WF = 10 mm, HF = 25 mm, LF = 24 mm and ß = 0° is introduced as the optimum model with the best performance among all studied configurations.

Thermal-Hydraulic Performance and Optimization of Tube Ellipticity in a Plate Fin-And-Tube Heat Exchanger

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Hua Zhu ◽  
Zhuo Yang ◽  
Tariq Amin Khan ◽  
Wei Li ◽  
Zhijian Sun ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Friction Factor ◽  
Hydraulic Performance ◽  
Pareto Optimal ◽  
Maximum Heat ◽  
Tube Heat Exchanger ◽  
Simulation And Optimization ◽  
Colburn Factor ◽  
Overall Performance

The flow field inside the heat exchangers is associated with maximum heat transfer and minimum pressure drop. Designing a heat exchanger and employing various techniques to enhance its overall performance has been widely investigated and is still an active research. The application of elliptic tube is an effective alternative to circular tube which can reduce the pressure drop significantly. In this study, numerical simulation and optimization of variable tube ellipticity is studied. The three-dimensional numerical analysis and a multi-objective genetic algorithm (MOGA) with surrogate modeling are performed. Tubes in staggered arrangement in fin-and-tube heat exchanger are investigated for combination of various elliptic ratios and Reynolds numbers. Results show that increasing elliptic ratio increases the friction factor due to increased flow blocking area, however, the effect on the Colburn factor is not significant. Moreover, tube with lower elliptic ratio followed by higher elliptic ratio tube has better thermal-hydraulic performance. To achieve the best overall performance, the Pareto optimal strategy is adopted for which the computational fluid dynamics (CFD) results, artificial neural network (ANN), and MOGA are combined. The tubes elliptic ratio and Reynolds number are the design variables. The objective functions include Colburn factor (j) and friction factor (f). The CFD results are input into ANN model. Once the ANN is computed, it is then used to estimate the model responses as a function of inputs. The final trained ANN is used to drive the MOGA to obtain the Pareto optimal solution. The optimal values of these parameters are finally presented.

SIMULATION AND OPTIMIZATION OF HEAT-EXCHANGER PARAMETERS OF HEAT PIPES BY CHANGES OF ENTROPY

2018 ◽  
Vol 49 (16) ◽  
pp. 1545-1557 ◽  
Author(s):  
Andriy Redko ◽  
Nataliia Kulikova ◽  
Serhii Pavlovskiiy ◽  
Alexander Redko
Keyword(s):  
Heat Exchanger ◽  
Heat Pipes ◽  
Simulation And Optimization
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