Air-To-Air Heat-Exchangers for Houses

Shurcliff, William A.

doi:10.1146/annurev.eg.13.110188.000245

Cited by 22 publications

(13 citation statements)

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“…Two vertical surfaces will experience counter-current flow of air while the third (middle) surface should experience co-current flow of air ( Figure 2d). Overall, the airflow paths of the LoH Chamber design have complied with the segregation (no mixing) of air streams as expected of heat exchangers [7].…”

Section: The Loop Of Henle: Physiology and Concept Heat Recoverymentioning

confidence: 65%

“…In all heat recovery systems, the underlying principle is to eliminate or minimise the energy needed to heat incoming (fresh) air by re-using the heat from outgoing (stale) air preferably without any mixing taking place between both streams of air [7]. 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).…”

Section: Active and Passive Heat Recovery Systems: An Overviewmentioning

confidence: 99%

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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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Section: The Loop Of Henle: Physiology and Concept Heat Recoverymentioning

confidence: 65%

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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“…Besides the electric consumption of the fans, the frost quantity may increase until it blocks the passageways for exhaust air and completely stops the airflow. Several frost control methods are mentioned in scientific literature ( [31,27] , Nielsen et al [26] , Evaluation of a dynamic model for a cold climate counter flow air-to-air heat exchanger, 2008, [29] ). However, there is little literature available on the evaluation performance related to these methods.…”

Section: Strategies Under Frosting Conditionsmentioning

confidence: 99%

“…These strategies help to avoid or to remove the frost layer on the heat transfer surface of the heat exchangers. There are three categories of frost formation controlling methods: the defrost method [27] , the frost control method [25,31,29] and the hybrid method.…”

Section: Strategies Classificationmentioning

confidence: 99%

Investigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation

Gendebien¹,

Parthoens²,

Lemort³

2019

Energy and Buildings

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This paper tackles the issue of frost formation in air-to-air heat recovery devices dedicated to single room ventilation by means of both numerical simulations and experimental approaches. In such heat exchangers, it is commonly known that the formation of a frost layer on the surface generates an additional thermal resistance and a flow section reduction, which leads to an overall degradation of the overall unit performance. This paper proposes a three-zone model, considering a dry, a wet and a frost zone, by determining the location of moving boundaries. Each zone is handled independently and the relative proportion of each zone is determined by means of the exchanger wall temperature. Besides this frost model, a defrost model is also envisaged. Once validated with experimental data collected on a U-flow-type heat exchanger, the developed model is used to implement different strategies to reduce or prevent frost formation in the exchanger. Based on three different criteria, these strategies are compared with each other to evaluate their benefits and drawbacks. The criteria give information on the energy efficiency of the ventilation, on the air renewal quality and on the pressure balance between the inside and the outside of the building.

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“…Some new ERV systems include filtration media such as high MERV rating filters and pre-filtration for large particles to improve indoor air quality. Shurcliff [1] provides an overview of residential air-to-air heat exchangers, and La et al [2] provide detailed review of rotary desiccant technology.…”

Section: Introductionmentioning

confidence: 99%

Formaldehyde transfer in residential energy recovery ventilators

Hult¹,

Willem²,

Sherman³

2014

Building and Environment

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like to thank Doug Sullivan for his role in setting up experiments, calibrating instruments and balancing the system, as well as Sebastian Cohn and Marion Russell for sample preparation and analysis. AbstractThe rotary enthalpy wheel design used in many energy recovery ventilators (ERVs) is designed to transfer heat and moisture between supply and exhaust air streams. The wheel, however, can also transfer formaldehyde and other indoor contaminants from the exhaust stream to the supply stream through air leakage, entrainment in the porous wheel, and adsorption/desorption to the filter medium. This contaminant transfer reduces the benefit of the mechanical ventilation provided by the device. Field and chamber experiments were used to quantify the formaldehyde transfer efficacy (the fraction of formaldehyde transferred from the exhaust stream to the supply stream) in a common ERV model under varied conditions. In field experiments, the transfer efficacy was approximately 29%. Chamber tests showed formaldehyde transfer efficacy between 10 and 29%. The bulk of the transfer was due to air leakage and entrainment within the wheel, with up to 30% of the transfer attributed adsorption/desorption from the filter medium. The transfer efficacy decreased with increasing air exchange rate and supply air temperature. The transfer efficacy increased as the supply and exhaust streams were unbalanced in flow rate. Overall, the air leakage through the device substantially exceeded the product rating of 10%, with 27-28% air leakage measured in field experiments and 12-19% air leakage in chamber experiments.

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Air-To-Air Heat-Exchangers for Houses

Cited by 22 publications

References 0 publications

Natural Ventilation with Heat Recovery: A Biomimetic Concept

Natural Ventilation with Heat Recovery: A Biomimetic Concept

Investigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation

Formaldehyde transfer in residential energy recovery ventilators

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