Development of a plastic rotary heat exchanger for room-based ventilation in existing apartments

Smith, Kevin Michael; Svendsen, Svend

doi:10.1016/j.enbuild.2015.07.061

Cited by 34 publications

(17 citation statements)

References 16 publications

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“…The authors obtained similar efficiencies for a range of flow rates using a prototype single-room ventilator with a rotary heat exchanger intended for use in existing apartments [4]. Its modelled temperature efficiency accounted for leakage and predicted 90% to 78% for balanced flow rates of 3.6 L/s to 13.0 L/s respectively, and experiments agreed adequately despite some uncertainty.…”

Section: Heat Recoverysupporting

confidence: 55%

“…To achieve this scenario, the assessment emphasized the need for inexpensive and flexible ventilation systems with heat recovery as well as the necessary knowledge and competence for proper implementation. For that purpose, Smith and Svendsen [4] described a collaborative development of a rotary heat exchanger for room-based ventilation in existing apartments. The development of that prototype led to the current investigation, which simulated its impacts on indoor humidity to obtain knowledge for proper implementation.…”

Section: Introductionmentioning

confidence: 99%

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The effect of a rotary heat exchanger in room-based ventilation on indoor humidity in existing apartments in temperate climates

Smith

Svendsen

2016

Energy and Buildings

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Document VersionPeer reviewed version Link back to DTU Orbit Citation (APA): Smith, K. M., & Svendsen, S. (2016). The effect of a rotary heat exchanger in room-based ventilation on indoor humidity in existing apartments in temperate climates. Energy and Buildings, 116, 349-361. DOI: 10.1016/j.enbuild.2015.12 AbstractThe investigation constructed and simulated moisture balance equations for single-room ventilation with a non-hygroscopic rotary heat exchanger. Based on literature, the study assumed that all condensed moisture in the exhaust subsequently evaporated into the supply. Simulations evaluated the potential for moisture issues and compared results with recuperative heat recovery and whole-dwelling ventilation systems. To assess the sensitivity of results, the simulations used three moisture production schedules to represent possible conditions based on literature. The study also analyzed the sensitivity to influential parameters, such as infiltration rate, heat recovery, and indoor temperature. With a typical moisture production schedule, the rotary heat exchanger recovered excessive moisture from kitchens and bathrooms, which provided a mold risk. The rotary heat exchanger was only suitable for single-room ventilation of dry rooms, such as living rooms and bedrooms. The sensitivity analysis concluded that varying heat recovery or indoor temperature could limit indoor relative humidity in dry rooms when a moderate risk was present. The rotary heat exchanger also elevated the minimum relative humidity in each room, which could help to avoid negative health impacts. A discussion emphasized the potential benefits of selecting heat recovery to match the individual needs of each room. KeywordsDecentralized ventilation; single-room ventilation; room-based ventilation; rotary heat exchanger; moisture issues; mold risk; renovated buildings; energy retrofit; temperate climate. 2 Highlights• The simulated rotary heat exchanger provided moisture concerns in several rooms.• The rotary heat exchanger was only suitable for ventilation of so-called dry rooms.• Varying heat recovery or temperature can limit indoor relative humidity in dry rooms.• Single-room ventilation allows selection of heat recovery to match the needs of rooms. Nomenclature

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Section: Heat Recoverysupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

The effect of a rotary heat exchanger in room-based ventilation on indoor humidity in existing apartments in temperate climates

Smith

Svendsen

2016

Energy and Buildings

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“…Another novel rotary wheel unit in Europe has been described by Smith et al (shown in Figure 12), which uses plastic as the heat transfer material and was installed in the exterior wall of an individual room vent, requiring minimal space. Testing results indicated that this novel unit could recover about 84% of sensible heat with a ventilation rate of 7.8 L/s [45]. In addition, bypass leakage was observed during the experiment and the pressure drop reached around 18% [45].…”

Section: Heat-recovery-assisted Decentralized Ventilation Systemmentioning

confidence: 94%

“…Testing results indicated that this novel unit could recover about 84% of sensible heat with a ventilation rate of 7.8 L/s [45]. In addition, bypass leakage was observed during the experiment and the pressure drop reached around 18% [45]. High-pressure leakage could cause discomfort noise due to the higher fan speed required to achieve the desired vent rate.…”

Section: Heat-recovery-assisted Decentralized Ventilation Systemmentioning

confidence: 98%

Review of Heat Recovery Technologies for Building Applications

Riffat

Zhang

2019

Energies

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In recent years, interest in heat recovery systems for building applications has resurged due to concerns about the energy crisis and global climate changes. This review presents current developments in four kinds of heat recovery systems for residential building applications. A extensive investigation into the heat recovery integrated in energy-saving systems of residential buildings is also covered, including passive systems for building components, mechanical/natural ventilation systems, dehumidification systems, and the thermoelectric module (TE) system. Based on this review, key issues have been identified as follows: (1) The combination of heat recovery and energy-efficient systems could be considered as a promising approach to reduce greenhouse gas emissions and make residential buildings meet high performance and comfort requirements. However, real-life evaluation of these systems with economic analysis is insufficient; (2) When heat recovery is applied to mechanical ventilation systems, issues such as pressure leakages and air shortcuts should be addressed; (3) The heat pipe heat recovery system enjoys more potential in being combined with other sustainable technologies such as thermoelectric modules and solar energy systems due to its advantages, which include handy manufacturing and convenient maintenance, a lack of cross contamination, and greater thermal conductance.Energies 2019, 12, 1285 2 of 22 to Cuce et al., heat recovery systems are regarded as a greatly promising technology because of their ability to provide significant energy savings for residential buildings [6].The purpose of this review is partly to summarize the current development of heat recovery systems for residential building applications, including their normal types, characteristics, and technical energy-saving possibilities, and partly to discuss the application of heat recovery in energy-efficient systems of buildings, including heat recovery combined with passive systems, mechanical ventilation systems, dehumidification systems, and thermoelectric module (TE) systems of buildings. Finally, a summary and outlook of these systems will be presented. The Definition of Heat Recovery SystemsHeat recovery is often referred to as a device operating between two air sources at different temperatures which transfers energy from one side to the other. In other words, it is based on preheating the incoming air to the interior through recycled waste heat. In general, heat recovery systems could be classified into sensible heat recovery and enthalpy heat recovery. Because of its ability to recover both the sensible heat and the latent heat, enthalpy heat exchangers have a better sustainability effect because of the large proportion of the wet load in the ventilation system and the requirements of the indoor air humidity for modern buildings.A representative heat exchanger system in residential buildings is usually composed of a heat exchanger core, a fresh air inlet and separate contaminated air exhaust outlet, and a fan, as shown in Figure 1...

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“…The problem of frost formation in recuperation systems is known in many countries such as Russia, Canada and other northern countries, where the temperature of the environment can be below −25 • C. The work [1] include the detail description of the hoar frost formation, dynamic processes, experimental data and many other features of such systems and other [2].…”

Section: Introductionmentioning

confidence: 99%

IA method for measuring the amount of hoar frost formation in the recuperation channels of ventilation systems using the adjustable mathematical model of this process

et al. 2017

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Abstract. The paper presents a method for measuring the amount of hoar frost formation in the recuperation channels of ventilation systems using the adjustable mathematical model of the hoar frost process. The principle is based on the fact that the contour of the adjustment of the hoar frost model is included in the measurement in accordance with the measured pressure drop, which is proportional to the amount of hoar frost. Unlike the known measurement methods, it is proposed to use the state variables of the mathematical model as the measured value. These state variables are not subject to non-deterministic interferences and random influences. The paper presents simulation results confirming the adequacy of the dynamic model. In conclusion, an example of the use of a recuperation channel in the defrost management system is given.

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Development of a plastic rotary heat exchanger for room-based ventilation in existing apartments

Cited by 34 publications

References 16 publications

The effect of a rotary heat exchanger in room-based ventilation on indoor humidity in existing apartments in temperate climates

The effect of a rotary heat exchanger in room-based ventilation on indoor humidity in existing apartments in temperate climates

Review of Heat Recovery Technologies for Building Applications

IA method for measuring the amount of hoar frost formation in the recuperation channels of ventilation systems using the adjustable mathematical model of this process

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