Appropriate position of porous insert in a heat exchanger by thermohydraulic analysis

Akar, Shima; Rashidi, Saman; Esfahani, Javad Abolfazli

doi:10.1002/htj.21279

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…Porous foams can enhance the DAPTC performance by mixing the HTF, increasing the heat transfer surface, thermal dispersion, and improving the volumetric absorption of solar radiation. However, they increase the friction factor, pressure drop, and pumping power [20]. Hence, porous media with different arrangements and schemes are employed inside the receiver tube to compare their preference.…”

Section: Specifications and Patterns Of The Metal Foamsmentioning

confidence: 99%

Exergy, Economic and Environmental Analysis of a Direct Absorption Parabolic Trough Collector Filled with Porous Metal Foam

Khattar

Heyhat

2022

Energies

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A direct absorption parabolic trough solar collector (DAPTC) integrated with porous foam as a volumetric absorber has the potential to be applied as an energy conversion integrant of future renewable energy systems. The present study comprehensively analyzes a DAPTC in terms of exergy, economic, and environmental analysis for different porous configuration inserts in the absorber tube. Ten different arrangements of porous foam are examined at several HTF flow rates (40–120 L/h) and inlet temperatures (20–40 °C). The exergy efficiency, entropy generation, Bejan number, and pumping power are investigated for all cases. Obtained results indicate that fully filling the absorber tube with porous foam leads to a maximum exergy efficiency of 20.4% at the lowest inlet temperature (20 °C) and highest flow rate (120 L/h). However, the Bejan number reaches its minimum value due to the highest pumping power in this case. Consequently, all mentioned performance parameters should be considered simultaneously. Finally, the environmental and economic analyses are conducted. The results show that fully filling the absorber tube with porous foam reflects the best heat production cost, which can reduced the embodied energy, embodied water, and CO2 emission by 559.5 MJ, 1520.8 kL, and 339.62 kg, respectively, compared to the base case at the flow rate of 120 L/h.

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Section: Specifications and Patterns Of The Metal Foamsmentioning

confidence: 99%

Exergy, Economic and Environmental Analysis of a Direct Absorption Parabolic Trough Collector Filled with Porous Metal Foam

Khattar

Heyhat

2022

Energies

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“…Garcia‐Valladares developed a one‐dimensional steady and transient simulation model of a triple concentric‐tube heat exchanger for numerical analysis of its thermal and fluid‐dynamic behavior. Akar et al numerically studied the appropriate position of a porous insert in a heat exchanger for better thermo‐hydraulic performance. Forced convection and entropy generation inside a channel with a heat generating porous block was investigated by Delavar and Hedayatpour .…”

Section: Introductionmentioning

confidence: 99%

Numerical study on heat transfer and pressure drop characteristics of fluid flow in an inserted coiled tube type three fluid heat exchanger

Mohapatra

Ray

Sahoo

et al. 2019

Heat Trans. Asian Res.

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The paper presents numerical investigations of a three fluid heat exchanger (TFHE), which is an improvement on the double pipe heat exchanger, where a helical tube is inserted in the annular space between two straight pipes. The helical tube side fluid, that is, hot water continuously transfers heat to the outer annulus side fluid and innermost tube side fluid. The heat transfer and pressure drop characteristics of the TFHE are assessed for different flow rates and inlet temperatures. With an increment in the volumetric flow rate of the helical tube side fluid and outer annulus side fluid, the overall heat transfer coefficient increases, and the effectiveness decreases for heat transfer from the helical tube side fluid to outer annulus side fluid in both parallel flow and counter flow configurations. It is also observed that with increment in the helical tube side fluid inlet temperature, the overall heat transfer coefficient and effectiveness increases for heat transfer from the helical tube side fluid to outer annulus side fluid in both flow configurations. The parameter, JF factor, has been proposed to evaluate the thermohydraulic behavior of the TFHE, where it is obtained that the behavior of the TFHE is better at a lower helical tube side fluid velocity and higher outer annulus side fluid velocity.

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“…Due to the complexity of active methods and their limitation for not being functional without an external energy source, passive methods are more common. Implementing fins, fluid additives, swirls flow devices, and porous mediums can be placed in this category. Kiwan and Al‐Nimr have numerically examined the thermal performance of a channel with the porous fins attached to a hot wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

Baou

Afsharpanah

Delavar

2019

Heat Trans. Asian Res.

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A vehicle radiator is used for cooling down the hot working fluid with airflow passing over its flow passages and fins.The proper design of the radiator is very important due to space and weight limitations in automobiles. In this study, a numerical investigation has been conducted on the improvements, which can be obtained by implementing different porous fins in the radiator channels.The effects of different porous fin configurations with the same porous media volume on the heat transfer rate and pressure drop were investigated. The coefficient of performance values were presented for evaluating the overall performance. The investigated geometries included horizontal, vertical, corrugated, and wavy-corrugated configurations. The results showed that the corrugated pattern had the best thermal performance among these geometries while the horizontal configuration presented the lowest pressure loss, even though the best overall performance belonged to wavy-corrugated configuration. After selecting this configuration, the influence of different porous materials on the radiator performance was studied. Finally, the radiator with the optimum porous media configuration and material was compared to a conventional radiator. It was found that implementing this porous media in the radiator channels improves its overall thermal performance factor up to 237%. K E Y W O R D Sheat exchanger, heat transfer enhancement, porous media, pressure drop, thermal performance, vehicle radiator

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Appropriate position of porous insert in a heat exchanger by thermohydraulic analysis

Cited by 10 publications

References 31 publications

Exergy, Economic and Environmental Analysis of a Direct Absorption Parabolic Trough Collector Filled with Porous Metal Foam

Exergy, Economic and Environmental Analysis of a Direct Absorption Parabolic Trough Collector Filled with Porous Metal Foam

Numerical study on heat transfer and pressure drop characteristics of fluid flow in an inserted coiled tube type three fluid heat exchanger

Numerical study of enhancing vehicle radiator performance using different porous fin configurations and materials

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