A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications

Alam, Tabish; Kim, Man-Hoe

doi:10.1016/j.rser.2017.08.060

Cited by 308 publications

(81 citation statements)

References 125 publications

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“…The refrigerant vapor in the heat pump evaporator first transfers the cooling capacity to a certain kind of refrigerant, and then carries the energy transfer to the seawater through the intermediate heat exchanger. In this process, how to ensure the efficient transfer of energy in various heat exchangers has been a problem in the industry [29]. Therefore, it is a current research hotspot to use nanoparticles as a refrigerant to enhance the heat transfer method to actively increase the flow heat transfer rate of the heat exchanger and increase the energy efficiency coefficient of the heat pump system [30].…”

Section: Introductionmentioning

confidence: 99%

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Wang

Han

et al. 2020

Energies

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A marine seawater source heat pump is based on the relatively stable temperature of seawater, and uses it as the system’s cold and heat source to provide the ship with the necessary cold and heat energy. This technology is one of the important solutions to reduce ship energy consumption. Therefore, in this paper, the heat exchanger in the CO2 heat pump system with graphene nano-fluid refrigerant is experimentally studied, and the influence of related factors on its heat transfer enhancement performance is analyzed. First, the paper describes the transformation of the heat pump system experimental bench, the preparation of six different mass concentrations (0~1 wt.%) of graphene nanofluid and its thermophysical properties. Secondly, this paper defines graphene nanofluids as beneficiary fluids, the heat exchanger gains cold fluid heat exergy increase, and the consumption of hot fluid heat is heat exergy decrease. Based on the heat transfer efficiency and exergy efficiency of the heat exchanger, an exergy transfer model was established for a seawater source of tube heat exchanger. Finally, the article carried out a test of enhanced heat transfer of heat exchangers with different concentrations of graphene nanofluid refrigerants under simulated seawater constant temperature conditions and analyzed the test results using energy and an exergy transfer model. The results show that the enhanced heat transfer effect brought by the low concentration (0~0.1 wt.%) of graphene nanofluid is greater than the effect of its viscosity on the performance and has a good exergy transfer effectiveness. When the concentration of graphene nanofluid is too high, the resistance caused by the increase in viscosity will exceed the enhanced heat transfer gain brought by the nanofluid, which results in a significant decrease in the exergy transfer effectiveness.

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Section: Introductionmentioning

confidence: 99%

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Wang

Han

et al. 2020

Energies

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“…Many researchers have performed the reviewing on passive or active heat transfer enhancement methods [3][4][5][6][7][8][9][10]. This paper focuses on the reviewing of the recent investigations about the heat transfer enhancement with coiled and twisted tape inserts which are widely used as a passive technique in tubular flow.…”

Section: Simple Definitions Used To Evaluate Heat Transfer Enhancementmentioning

confidence: 99%

A Review of Heat Transfer Enhancement Methods Using Coiled Wire and Twisted Tape Inserts

Keklikçioğlu¹,

Özceyhan²

2018

Heat Transfer - Models, Methods and Applications

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Heat transfer enhancement is categorized into passive and active methods. Active methods need external power to input the process; in contrast, passive methods do not require any additional energy to improve the thermohydraulic performance of the system. Passive methods are widely used in both experimental and numerical applications when investigating heat transfer enhancement and friction losses to save energy and costs. The many passive methods for increasing heat transfer rate include various components located in the fluid flow path, such as twisted tapes, coiled or tangled wires, and nozzle turbulators. The present paper represents a comprehensive review that focused on heat transfer enhancement methods with coiled wire and twisted tape inserts since the installation of inserts is easier and more economical. The thermodynamic performance of heat exchange components is also affected by the flow conditions such as laminar or turbulence. The present review comprises investigations on the enhancement of heat transfer using twisted tape and coiled wire inserts in laminar and turbulent flow region.

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“…Sabiendo que para este mineral es de pH pzc 2.7 [14], el sistema con valores de pH cercanos al pH pzc mantiene una polaridad positiva, promoviendo la movilidad de cargas donadas por el agente de sacrificio para generar radicales libres responsables de la disociación del agua. Con base en lo anterior, la producción de hidrógeno con agentes de sacrificio en medio ácido se vio favorecida tanto para EDTA como para CH 3 [19,20]. Para el metanol, la baja actividad pudo presentarse por el tipo de adsorción sobre la superficie del mineral (molecular y/o disociativamente), dando lugar a la formación de nuevos grupos funcionales que no favorecen la generación de radicales responsables de la disociación del agua [21].…”

Section: Efecto Del Ph En La Producción Fotocatalítica De Hidrógenounclassified

“…Debido a la demanda energética mundial, la industria se ha visto obligada a incrementar la producción de crudo, carbón o gas natural o, como en los últimos tiempos, a explorar otras fuentes energéticas que contribuyan a suplir esta demanda. Una de estas opciones ha sido la utilización de energías alternativas, las cuales han mostrado ventajas desde el punto de vista ambiental y económico debido a la reducción de emisiones gaseosas contaminantes (CO 2 ) y a la posibilidad de emplear recursos renovables para su obtención [1,2,3]. Entre estas, la producción de hidrógeno es una alternativa energética debido a su elevado poder calorífico y combustión limpia [4] Durante las últimas décadas ha crecido el interés por convertir la energía solar en energía química [5], por ejemplo, mediante procesos fotoquímicos que a través de reacciones fotocatalíticas son capaces de producir hidrógeno por efecto de la sensibilización de un semiconductor con luz, cuya función es la generación de radicales libres responsables de la oxidación/reducción [6].…”

Section: Introductionunclassified

“…Los materiales empleados actualmente permiten que se tenga un menor peso en un mismo volumen, que se absorba más calor por unidad de volumen y en general que se contribuya al ahorro de energía convencional. Es de resaltar que la intensificación de transferencia de calor ayuda a controlar las condiciones térmicas de los equipos, que, junto con el ahorro de energía y materiales constructivos, son determinantes en el desempeño de los sistemas de intercambio de calor [3].…”

Section: Introductionunclassified

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Estudio comparativo del uso de diferentes agentes de sacrificio para la producción de hidrógeno mediante fotocatálisis heterogénea utilizando el mineral arena negra como semiconductor

López–Vásquez

Silva

2018

Avances

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El mineral arena negra es una mezcla de óxidos de hierro (FeO, Fe2O3, Fe3O4), TiO2 y SiO2 dispuestos en una estructura natural, que podría ser utilizado como semiconductor. En este trabajo se evaluó el efecto del agente de sacrificio para la generación fotocatalítica de hidrógeno utilizando este material como catalizador. Para tal fin se evaluó el efecto de variables del proceso tales como tipo de agente de sacrificio (EDTA, Na2SO3 y metanol) normalmente utilizados como donadores de electrones en la reacción fotocatalítica de producción de hidrógeno, pH inicial de la suspensión (3.0, 7.0 y 9.0) y la concentración del sustrato. Estas variaron entre 1.0, 25.0 y 50.0 mM (EDTA, Na2SO3) y 10.0, 30.0 y 50.0% (v/v) para metanol. Bajo las condiciones de reacción evaluadas, los niveles de máxima producción de hidrógeno fueron Na2SO3>EDTA>CH3OH, respectivamente y la máxima producción de hidrógeno se obtuvo con 25.0 mM Na2SO3 en medio ácido (pH 7.0). La degradación de EDTA y simultánea producción de hidrogeno mediante reacción fotocatalítica, se vieron favorecidos a pH 3.0 y una concentración 1.0 mM

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A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications

Cited by 308 publications

References 125 publications

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

A Review of Heat Transfer Enhancement Methods Using Coiled Wire and Twisted Tape Inserts

Estudio comparativo del uso de diferentes agentes de sacrificio para la producción de hidrógeno mediante fotocatálisis heterogénea utilizando el mineral arena negra como semiconductor

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