Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Hatami, M.; Ganji, D.D.; Gorji-Bandpy, M.

doi:10.1007/s00521-015-1973-1

Cited by 11 publications

(4 citation statements)

References 31 publications

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“…En todos estos estudios la combinación específica de parámetros óptimos depende de las características particulares del intercambiador de calor y el tipo de inserto utilizado, sin embargo, vale la pena desatacar algunas conclusiones generales. Chikh et al [8] reportaron que cuando la diferencia de temperatura entre fuente y sumidero de calor es mayor a 20 K las irreversibilidades son principalmente debido a la transferencia de calor y las configuraciones optimas suelen favorecer el incremento en el área de contacto entre el fluido y el inserto. Mientras que si la diferencia de temperatura es pequeña las irreversibilidades son principalmente producto de la fricción, por lo que las configuraciones optimas tienden a reducir el tamaño de la superficie de transferencia de calor.…”

Section: Problemas De Optimizaciónunclassified

“…Estos estudios traen como limitante la cantidad de recursos computacionales y el tiempo requerido para alcanzar la convergencia de los resultados de la simulación, por lo que estos estudios abarcan un reducido rango de parámetros de diseño [7]. La optimización en estos casos requiere el uso de técnicas especiales, Hatami et al utilizaron un diseño central compuesto como matriz de experimentos para utilizar un número mínimo de simulaciones en la optimización de superficies extendidas de un recuperador de calor utilizando dinámica de fluidos computacional [8]. Por el contrario, el uso de modelos algébricos simplificados basados en correlaciones empíricas, utilizan ecuaciones de balance sobre volúmenes de control que abarcan todo el intercambiador de calor.…”

Section: Introductionunclassified

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Optimización termodinámica de la transferencia de calor en flujos internos de gases con insertos tipo anillo cónico

Baritto¹,

Otero²,

Suárez³

et al. 2020

revuin

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El uso de insertos estáticos permite el diseño de intercambiadores de calor de menor volumen, pero también pueden ser implementados en equipos existentes para mejorar su rendimiento. En este trabajo se desarrolla una metodología para la optimización termodinámica de insertos cónicos para el calentamiento de gases en tuberías a partir de un modelo algebraico adimensional. Se plantean y resuelven dos casos de optimización: el diseño de un intercambiador de calor en donde las únicas variables fijas son la temperatura de entrada y la transferencia de calor requerida. El segundo caso es la incorporación de los insertos a un intercambiador existente, en donde la temperatura de carga, flujo de masa y las características geométricas de la tubería son los parámetros fijos. Como resultados se presenta un análisis paramétrico en donde se estudia la influencia de distintos parámetros de diseño en la temperatura de descarga y la irreversibilidad termodinámica. Luego se presentan los resultados del proceso de optimización para distintas combinaciones de parámetros, y se discute las tendencias encontradas en las configuraciones óptimas. Los resultados son aplicados en un ejemplo para ilustrar el interés práctico de la metodología. Se encontró que para ambos casos de optimización las configuraciones óptimas corresponden a la mínima severidad de los insertos, mientras que los diseños óptimos corresponden siempre a la mínima relación de aspecto posible (L/D) para las tuberías, mientras que el número de tubos, contemplado en el número de Reynolds, se ajusta para satisfacer la temperatura de descarga

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Section: Problemas De Optimizaciónunclassified

Section: Introductionunclassified

Optimización termodinámica de la transferencia de calor en flujos internos de gases con insertos tipo anillo cónico

Baritto¹,

Otero²,

Suárez³

et al. 2020

revuin

View full text Add to dashboard Cite

show abstract

“…Zhang et al 30 selected three different types of heat exchangers including a plate heat exchanger, a shell‐and‐tube heat exchanger, and a finned tube heat exchanger, as the evaporator and condenser of an ORC system; a thermo‐economic evaluation and a comparison of different ORC configurations were presented. The comparative analysis of different types of heat exchangers in these studies is based on the design performance; these studies and 31‐33 do not consider differences in the off‐design performance of the system caused by the selection of heat exchangers. Few existing studies have analyzed the selection of heat exchangers based on the off‐design performance of the ORC system under all road conditions.…”

Section: Introductionmentioning

confidence: 99%

A novel design method of organic Rankine cycle system harvesting waste heat of heavy‐duty trucks based on off‐design performance

Shi

Wang

Cai

et al. 2020

Energy Science & Engineering

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The organic Rankine cycle (ORC) system can effectively recover waste heat from engines of heavy‐duty trucks, and is a promising method to improve the efficiency of on‐board engines. However, engine operating conditions fluctuate greatly while driving, the waste heat recovery system must often work under off‐design conditions, which significantly affects system performance. Further, different component structures can also affect the off‐design performance of the system. Thus, a novel design method of preheating organic Rankine cycle (P‐ORC) system harvesting waste heat of heavy‐duty trucks based on off‐design performance is proposed in this study. The design method includes selection of the optimal types of components and design point to optimize the comprehensive performance of the waste heat recovery system in all road conditions. In this study, different heat exchanger combinations are applied to the P‐ORC system to obtain six different design systems. According to the principle of uniform coverage, the scatter diagram of exhaust temperature and mass flow rate of the engine under real road conditions are discretized into 19 alternative design points. Each system is designed with 19 discretized design points, and a total of 114 design systems are obtained. The optimal heat exchanger combination and design point are selected based on the off‐design performance. It is concluded that a P‐ORC system using a combination of plate preheater, finned tube air cooler, and shell‐tube evaporator is the optimal system. The optimal design point number is 10, and the corresponding engine speed at DP10 is 1471 rpm, the engine torque is 474 Nm, the occurrence probability is 14.48%, the exhaust temperature is 350°C, the exhaust mass flow rate is 0.11 kg/s, and the maximum combined net power output is 4.26 kW. The results reveal that the optimal design point of the system can be selected at the design point with medium engine load and high occurrence probability. It guides the system design toward a more practical direction, so as to obtain an optimal system that could operate efficiently and recover more waste heat under the full working conditions of the engines. This novel design method can be extended for other cycle configurations.

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“…The optimization of spray parameters in APS method has the most effective on quality of coating. The most parameters on the APS method are current, voltage, spray distance and powder feed rate which are investigated in this study using Taguchi method as an efficient technique for reducing number of experiments for reducing the costs [9][10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Thermal Spray Parameters of NiAl/Cr2C3 Coating by Taguchi Method

Tahari

Luo

Geng

et al. 2019

SSP

Self Cite

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In this study the effect of thermal spray process on wear resistance of NiAl/Cr2C3 thermal spray coating has been investigated. For this purpose the NiAl power mixed with 10 %wt. Cr2C3 powder and milled for 1 hrs at argon atmosphere. The APS parameters such as voltage (V), current (A), spray distance (mm), powder feed rate (gr/min), were optimize using a response surface methodology. For investigation effect of spray parameters on quality of coatings, the porosity and wear resistance of coatings analyzed with SEM and pin on disk wear test. Results show that increase of voltage and current are more effective other parameters. Increasing of powder feed rate and spray distance raised porosity of coatings intensively.

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Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Cited by 11 publications

References 31 publications

Optimización termodinámica de la transferencia de calor en flujos internos de gases con insertos tipo anillo cónico

Optimización termodinámica de la transferencia de calor en flujos internos de gases con insertos tipo anillo cónico

A novel design method of organic Rankine cycle system harvesting waste heat of heavy‐duty trucks based on off‐design performance

Optimization of Thermal Spray Parameters of NiAl/Cr2C3 Coating by Taguchi Method

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