Modeling of Air to Air Enthalpy Heat Exchanger

Nasif, Mohammad Shakir; Al-Waked, Rafat; Behnia, Masud; Morrison, Graham

doi:10.1080/01457632.2012.659616

Cited by 33 publications

(16 citation statements)

References 20 publications

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“…Their developed codes included the variation in membrane moisture transfer resistance. Moreover, researchers attempted to model membrane heat exchangers by using commercial CFD packages assumed constant membrane moisture transfer resistances [4,[10][11][12]15] due to limitations of the packages in simulating moisture diffusion through a solid/porous membrane.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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CFD simulation of air to air enthalpy heat exchanger: Variable membrane moisture resistance

Al-Waked¹,

Nasif²,

Morrison³

et al. 2015

Applied Thermal Engineering

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…Extensive research have been performed to predict and improve its performance and to study heat and moisture transfer processes occurred across membrane surfaces [4,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of air to air enthalpy heat exchanger: Variable membrane moisture resistance

Al-Waked¹,

Nasif²,

Morrison³

et al. 2015

Applied Thermal Engineering

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“…1. Nasif et al (2005) have already investigated an enthalpy heat exchanger that presents a quite similar flow configuration (Z-flow configuration).…”

Section: Flow Configurationmentioning

confidence: 99%

Designing an air-to-air heat exchanger dedicated to single room ventilation with heat recovery

Gendebien

Martens²,

Prieels³

et al. 2017

Build. Simul.

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The present paper focuses on the development steps of heat exchangers dedicated to single room ventilation unit with heat recovery (SRVHR) by proposing a numerical approach. A methodology is suggested in order to determine the best trade-off between hydraulic and thermal performance given a specific geometry. The methodology consists in a mapping of the coefficient of performance (COP) of the unit. The latter is defined as the ratio between recovered heat and the fan energy use, given a specific indoor/outdoor temperature difference. However, the energy performance should not be the only criterion to be taken into account in the frame of the design steps of a heat recovery exchanger: technical, economic and acoustic aspects should also be considered. This numerical methodology is illustrated by means of a real example of a newly developed heat exchanger dedicated to a SRVHR. The optimization is first performed while using a semi-empirical model (based on the use of correlations and on a spatial division of the studied heat exchanger). The semi-empirical model allows for the creation of a COP map in order to identify the most effective geometry parameters for the heat exchanger. The decision concerning the final geometry is made accounting for the so-called technical, economic and acoustic considerations. A discussion on some parameters needed for the COP establishment is also proposed.

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“…Limitations in width of commercially available thin copper sheets are likely to influence a 1:2 scale model (1.8 m × 1.5 m × 1.8 m) using scheduled artificial heat sources. Subsequent modelling work targeting optimisation of the system will include: the use of fins to aid heat exchange along the plates; the use of corrugation (instead of flat sheets of metal) to increase the contact surfaces of the heat exchange plates; as well as the use of advanced polymer-based membranes or 45-gsm Kraft paper as used by Nasif et al [23] as heat exchange surfaces. Further optimisation of the system design and material specifications is therefore possible.…”

Section: Limitations and Future Workmentioning

confidence: 99%

“…Hviid and Svendsen [16] have demonstrated the combined use of analytical models and experiments to examine low-pressure heat exchange system for passive ventilation. The modelling of a Z-shaped system whose heat transfer surface was made of 45-gsm (grams per square meter) thick Kraft paper [23] is an interesting example of novel heat exchange membranes. Other simulation-based studies of heat exchange in naturally ventilated buildings are based on computational fluid dynamics (CFD) [10,24].…”

Section: Modelling Heat Exchange In Buildingsmentioning

confidence: 99%

Natural Ventilation with Heat Recovery: A Biomimetic Concept

Adamu

Price

2015

Buildings

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Abstract:In temperate countries, heat recovery is often desirable through mechanical ventilation with heat recovery (MVHR). Drawbacks of MVHR include use of electric power and complex ducting, while alternative passive heat recovery systems in the form of roof or chimney-based solutions are limited to low rise buildings. This paper describes a biomimetic concept for natural ventilation with heat recovery (NVHR). The NVHR system mimics the process of water/mineral extraction from urine in the Loop of Henle (part of human kidney). ), respectively, for the month of January. With active heating and single occupant, the LoH Chamber consumes between 65.7% and 72.1% of the annual heating energy required by a similar naturally ventilated space without heat recovery. The LoH Chamber could operate as stand-alone indoor cabinet, benefitting refurbishment of buildings and evading constraints of complicated ducting, external aesthetic or building age.

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Modeling of Air to Air Enthalpy Heat Exchanger

Cited by 33 publications

References 20 publications

CFD simulation of air to air enthalpy heat exchanger: Variable membrane moisture resistance

CFD simulation of air to air enthalpy heat exchanger: Variable membrane moisture resistance

Designing an air-to-air heat exchanger dedicated to single room ventilation with heat recovery

Natural Ventilation with Heat Recovery: A Biomimetic Concept

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