Experimental analysis of an air-to-air heat recovery unit for balanced ventilation systems in residential buildings

Fernández-Seara, José; Diz, Rubén; Uhía, Francisco J.; Dopazo, Alberto; Ferro, José M.

doi:10.1016/j.enconman.2010.07.040

Cited by 100 publications

(28 citation statements)

References 8 publications

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“…Past research found that membrane moisture transfer resistance varies when air flow inlet humidity conditions varies [8,9,[14][15][16][17][18][19][20][21][22][23][24][25][26]. The resistance variation across the membrane of the heat exchanger causes the amount of moisture transferred through the membrane to vary.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Air to air fixed plate membrane heat exchangers have been widely used in HVAC systems as energy recovery equipment that provided energy savings and improved indoor air quality [1][2][3][4][5][6][7][8][9]. 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%

See 1 more Smart Citation

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%

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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“…The heat exchange plate separating two streams of air (exhaust and fresh) can be designed to function either as sensible heat recovery heat exchangers (SHRHE) or total heat recovery heat exchanger (THRHE). The difference in their performances is based on recovery of either sensible heat or combined sensible and latent heat [8]. In typical heat exchangers, a large air residence time brought about by low velocity is desirable (it directly influences the effectiveness of the system) but at higher air velocities, the air residence time is short and hence, less heat transfer would occur [9].…”

Section: Active and Passive Heat Recovery Systems: An Overviewmentioning

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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“…The recovery of water vapor is particularly useful from an energy point of view, as it contributes to passively decreasing the energetic load that the air conditioning plants must support to remove water vapor in the warm season and to increase its presence in the cold season. Furthermore, the enthalpy heat exchangers show themselves to be useful for improving the indoor thermohygrometric comfort [2]. Though their structure is often rather simple, the practical applications of the enthalpy exchangers are limited.…”

Section: Introductionmentioning

confidence: 99%

Stabilized SPEEK Membranes with a High Degree of Sulfonation for Enthalpy Heat Exchangers

et al. 2018

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Abstract:In this investigation, we explored for the first time the use of cross-linked sulfonated poly (ether ether ketone) (SPEEK) membranes in the fabrication of enthalpy heat exchangers. SPEEK is very sensitive to changes in relative humidity, especially when featuring high degrees of sulfonation (DS), though a poor mechanical stability may be observed in the latter case. Cross-linking is crucial in overcoming this issue, and here, we firstly employed the INCA method (ionomer counter-elastic pressure "n c " analysis) to assess the improvements in the mechanical properties. The cross-link was achieved following a simple thermal-assisted process that occurs directly on the performed membranes. After an initial screening, a degree of cross-link = 0.1 was selected as the better compromise between absorption of water vapor and mechanical properties. When implemented in the enthalpy heat exchanger system, these cross-linked SPEEK membranes enabled a high level of sensible heat exchange, as well as a remarkable variation in the mass (water vapor) transfer between the individual air flows. The performances resulted in being better than those for the system based on a benchmark commercially available perfluorinated Nafion membrane.

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Experimental analysis of an air-to-air heat recovery unit for balanced ventilation systems in residential buildings

Cited by 100 publications

References 8 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

Natural Ventilation with Heat Recovery: A Biomimetic Concept

Stabilized SPEEK Membranes with a High Degree of Sulfonation for Enthalpy Heat Exchangers

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