Potentials of porous materials for energy management in heat exchangers – A comprehensive review

Rashidi, Saman; Kashefi, Mohammad Hossein; Kim, Kyung Chun; Abianeh, O. Samimi

doi:10.1016/j.apenergy.2019.03.200

Cited by 161 publications

(35 citation statements)

References 119 publications

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“…So, effects of (

p_{normalg}^{normali} + Δ p

) value on the energy intensity were investigated in this study. Additionally, the heat recovery may be enhanced in the future through optimization of membrane arrangements 41 or adopting new membrane materials 42 . Therefore, effects of enhanced heat recovery were discussed as well.…”

Section: Resultsmentioning

confidence: 99%

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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In this study, hydrophobic polytetrafluoroethylene (PTFE) and hydrophilic polyetheretherketone (PEEK) membranes were used as heat exchangers in rich-split CO 2 capture process to recover the waste heat from the stripped gas (i.e., mixture of water vapor and CO 2 ). Technical feasibilities of these two membrane exchangers were assessed by heat recovery and energy intensity in the monoethanolamine (MEA)-based carbon capture process. The heat recovery of these two membrane exchangers with different pore sizes were then systematically compared under various operating parameters. The underlying mass and heat transfer mechanisms of two membranes were also investigated and compared to figure out the suitable candidate for heat recovery. Additionally, the potential risks of using these membrane exchangers were identified and investigated. Results showed that the PTFE membrane displays a better heat recovery performance than the PEEK membrane with the same pore size. The heat recovery of both PTFE and PEEK membranes first increases to a plateau and then drops slightly with the increased CO 2 -rich solvent flow rate. The heat recovery of PTFE and PEEK membranes decreases with the increased flow rate and water vapor fraction of the inlet stripped gas, MEA temperature, and MEA concentration. Furthermore, the larger pore size results in higher heat recovery for both PTFE and PEEK membranes. PTFE membranes displayed lower MEA transfer flux than PTFE membranes at any rich MEA flow rate as the enhanced MEA transfer from the cold solution to the other side via PEEK membrane pores filled with liquid water. C

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“…So, effects of (

p_{normalg}^{normali} + Δ p

Section: Resultsmentioning

confidence: 99%

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Cui

et al. 2020

Greenhouse Gases

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“…There are plate heat exchangers, in which the inter-plate channels for coolant motion are filled with porous metal inserts with a high specific area of the inner frame surface and small equivalent diameters of the internal channels, providing a high rate of heat exchange of the working medium. The proposed design significantly increases heat transfer [1][2][3].…”

Section: Introductionmentioning

confidence: 98%

Heat-exchange units with porous inserts

et al. 2019

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Currently, porous metals are not used in heat supply systems. Usage of porous materials in heat exchangers increases the heat transfer intensity and makes the heat exchangers more compact. An experimental setup consisting of two circuits was developed in order to study the influence of porous metals on heat transfer intensity. In the first circuit the hot coolant is water, which flows through narrow tubes inside the porous metal. In the second circuit the cold coolant is freon. The purpose of the study is to obtain experimental confirmation of the hypothesis of an increase in the heat transfer intensity when using porous metals. To achieve this goal, experiments were carried out, which showed the increased heat transfer intensity. The standard methods for calculating heat exchangers cannot be applied in this case as the inner pores’ surface is unknown. A mathematical model was compiled allowing engineering calculations for the heat exchangers of this type. The hot water temperature inside the heat exchanger is determined analytically. The resulting equation allows us to determine the cooling degree of the first coolant, i.e. hot water. The obtained deviations between experimental and analytical data are within the acceptable limits, which indicates the reliability of the proposed model.

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“…Foam material is a type of porous, lightweight, high-strength, low-density media [1], which has high heat transfer characteristics and strong flow mixing characteristics due to its inherent properties such as high porosity, large specific surface area, disordered pore distribution, tortuous flow path [2]. Hence, foam materials are widely used in various heat exchange fields, including heat exchangers [3], heat sinks [4][5][6], electronic cooling [7], cooling towers [8], volumetric absorbers [9][10][11], catalytic reactors [12,13], etc.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of devising maximum effective heat transfer efficiency and using smaller and lighter material is well recognized when using foam material as the heat exchange medium for products [14]. Due to the specific structure of the foam material, the magnitude of the volumetric heat transfer coefficient is as high as 10 4 to 10 6 W/(m 3 •K), and the convective heat transfer of the fluid-solid phase contributes greatly to the overall heat transfer. Therefore, it is appropriate to use the convective volumetric heat transfer coefficient to characterize and evaluate the heat transfer performance [15].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

Han

Yang

Wu³

et al. 2020

Energies

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Foam materials are widely used in heat exchange because of their high porosity and large specific surface area. Correctly characterizing heat transfer characteristics is the key to ensuring efficient heat transfer. In this paper, single-blow transient test technology is used to experimentally measure the temperature. Silicon carbide ceramics with various thicknesses ranging from 30 to 105 mm and different pore structures were used in the experiments. The test was carried out at the velocity ranging from 0.5 to 1.8 m/s. The air temperature distributions of the inlet and outlet were obtained by processing the experimental data, and the regularity of the average volumetric heat transfer coefficient was obtained and analyzed. Subsequently, the simplified tetrakaidecahedron models with a porosity of 0.85 and 0.75 were used to analyze the heat transfer characteristics. The local thermal equilibrium and local thermal non-equilibrium at the pore scale were analyzed. By comparing the simulation with the experiment, it shows that the larger thickness affects local thermal equilibrium and leads to a decrease in the volumetric heat transfer coefficient. The conclusion can be used to guide the optimization of the design of foam material-mediated heat exchange equipment.

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Potentials of porous materials for energy management in heat exchangers – A comprehensive review

Cited by 161 publications

References 119 publications

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Waste heat recovery from the stripped gas in carbon capture process by membrane technology: Hydrophobic and hydrophilic organic membrane cases

Heat-exchange units with porous inserts

Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

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