Numerical investigation of heat and mass transfer in partially blocked membrane based heat exchanger: Effects of obstacles forms

Sabek, S.; Tiss, F.; Chouikh, R.; Guizani, Amenallah

doi:10.1016/j.applthermaleng.2017.11.019

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…k-epsilon model is being used as the turbulence model. The governing equations for the study we shown in equations ( 1) to (7) Continuity equation…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

“…Another study using the software proposed that helical wire inserts can increase the Nusselt number by 1.77 times. Some studies also suggested that circular obstacles in heat exchangers can increase the overall performance, compared to other form of obstacles like rectangular or triangular [6][7]. A study using CFD-segmented heat exchanger model using open sourced solver Open FOAM have recommended that velocity scaling between different fin geometries must be avoided.…”

Section: Introductionmentioning

confidence: 99%

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EFFECT OF DEAN NUMBER ON THE HEAT TRANSFER CHARACTERISTICS OF A HELICAL COIL TUBE WITH VARIABLE VELOCITY & PRESSURE INLET

Nashine¹,

Singh²

2020

Journal of Thermal Engineering

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The heat transfer, friction factor, pressure difference, Nusselt number of a helical coil tube using variable pressure and velocity during inlet for various values of Dean number [ratio of coil diameter (D) to tube diameter (d)] has been studied using commercially available computational tool. A validation is performed using the computational tool through the experimental data and it was observed that the results are in good agreement. The helical coil of 0.3 m diameter with four (4) turns of inner diameter 0.01 m with length 3.77 has been modelled, meshed and analyzed for both laminar and turbulent flows of constant wall temperature and heat flux. A grid independence test is also performed. The results show that increase in Dean number increases the heat transfer of the helical tube. The increases in pressure have less effect on heat transfer during laminar flow while adverse effect can be observed during turbulent flow.

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“…k-epsilon model is being used as the turbulence model. The governing equations for the study we shown in equations ( 1) to (7) Continuity equation…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

EFFECT OF DEAN NUMBER ON THE HEAT TRANSFER CHARACTERISTICS OF A HELICAL COIL TUBE WITH VARIABLE VELOCITY & PRESSURE INLET

Nashine¹,

Singh²

2020

Journal of Thermal Engineering

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“…The simplest and most common configuration is cross-flow arrangement [16], modified flow configurations are quasi-counter current flow [17], Z-shaped flow [18], and mixed flow [19]. To intensify heat and mass transfer, channel structures including cross-corrugated triangle [20], partially blocked [21,22], spacer-filled [23], multichannel [24], new corrugated mesh spacer, and novel duct structures including curvature and circular [25] have been investigated. -…”

Section: Introductionmentioning

confidence: 99%

Effect of Geometric Parameters on the Performance of a Membrane‐Based Enthalpy Exchanger

et al. 2023

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A membrane‐based enthalpy exchanger (MBEE) with partial inlet is proposed. Numerical simulations were conducted to investigate the effect of Reynolds number (Re), the ratio of entrance area to channel cross‐sectional area Re−c, and channel length/width ratio Rl−w on the performance of the MBEE. Effectiveness, pressure loss, and flow patterns were evaluated for optimization. Moreover, the entransy theory was applied to analyze the mechanism of the heat transfer enhancement of the MBEE. The results indicate that the larger the Re–c, the higher the effectiveness and lesser pressure drop of the MBEE at the same volumetric flow rate. The total heat exchange rate per unit area and the pressure drop per unit length are reduced with the increasing of Rl–w .

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“…Besides, it's also used to enhance the IAQ by exchanging indoor and outdoor air which purifies it [11]. Some numerical models of VHR such as the CFD model have been developed for the purpose of optimization in some complex cases [12]. Unfortunately, there was a lack of experimental data to validate the developed numerical models due to limitations of resources available.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Supply and Outdoor Air Temperature on The Enthalpy and Temperature Exchange Efficiency of a Paper Heat Exchanger

Heng

Al-Obaidi

Meng³

et al. 2021

MATEC Web Conf.

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Heat Recovery Ventilator (VHR) is widely used nowadays as it is capable to maintain high Indoor Air Quality (IAQ) while minimizing the energy loss of indoor air through air-to-air heat exchanger principle. The main component that enables VHR to perform air-to-air heat exchange is known as Paper Heat Exchanger (PP-HEX). Hence, the objective of this research is to study and analyse the performance of a PP-HEX under different return and outdoor air temperatures as well as their effect on both enthalpy and temperature exchange efficiency. Moreover, some numerical models of VHR have been developed to optimize some complex cases and the numerical models are meant to reduce the physical experiments to analyze or improve complex cases in the future. To the best of the authors knowledge, there is no experimental data available from any sources to validate the numerical models. To address this issue, two different supplies of PP-HEX are tested with an actual VHR, and both PP-HEXs will be referred to as PP-HEX-A and PP-HEX-B due to confidentiality. Furthermore, the testing is conducted in a temperature-controlled testing laboratory and the testing conditions are set according to the ISO standard. The preliminary testing results show that the temperature exchange efficiency and enthalpy exchange efficiency of the PP-HEXs have the same trends while the outdoor air temperature is fixed and varying the temperature of indoor air. In contrary, the temperature exchange efficiency and enthalpy exchange efficiency of the PP-HEXs have the same trends while the indoor air temperature is fixed and varying the temperature of outdoor air as well. With the default voltage supplies (240V) to VHR and the setup conditions (according to the ISO Standard) of return air to be 27°C and outdoor air to be 35°C, the testing results show that PP-HEX-A has a temperature exchange efficiency and enthalpy exchange efficiency with a range of (37.97 – 40.28) % and (30.77 – 57.81) % respectively. While PP-HEX-B has a temperature exchange efficiency and enthalpy exchange efficiency with a range of (35.29 – 42.5) % and (39.6 – 55.93) % respectively.

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Numerical investigation of heat and mass transfer in partially blocked membrane based heat exchanger: Effects of obstacles forms

Cited by 21 publications

References 33 publications

EFFECT OF DEAN NUMBER ON THE HEAT TRANSFER CHARACTERISTICS OF A HELICAL COIL TUBE WITH VARIABLE VELOCITY & PRESSURE INLET

EFFECT OF DEAN NUMBER ON THE HEAT TRANSFER CHARACTERISTICS OF A HELICAL COIL TUBE WITH VARIABLE VELOCITY & PRESSURE INLET

Effect of Geometric Parameters on the Performance of a Membrane‐Based Enthalpy Exchanger

The Effect of Supply and Outdoor Air Temperature on The Enthalpy and Temperature Exchange Efficiency of a Paper Heat Exchanger

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