Conceptual optimization of a rotary heat exchanger with a porous core

Dallaire, Jonathan; Gosselin, Louis; Silva, Alexandre K. da

doi:10.1016/j.ijthermalsci.2009.07.027

Cited by 46 publications

(17 citation statements)

References 22 publications

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“…This leads to enormous heat losses, therefore efficient exchange of heat between the exhaust and supply air fluxes is absolutely necessary for reducing the heat losses. Numerous experimental and modelling studies have clearly demonstrated that up to a 90 % heat recovery can be reached by using modern plate [78,79] and regenerative [80,81] air-to-air heat exchangers. Another problem that appears during cold winter is continuous loosing of moisture through ventilation system [82,83].…”

Section: Adsorptive Inter-seasonal Heat Storagementioning

confidence: 99%

Current progress in adsorption technologies for low-energy buildings

Aristov

2015

Future Cities and Environment

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More than half of the world's population currently lives in cities. An essential constituent of future sustainable cities is energy efficient and ecologically sound buildings which ensure high levels of comfort and convenience without reducing the standards of living. At present, a significant part of primary fossil fuels is spent for heating/cooling of buildings, thus, greatly contributing to total GHG emissions. In this paper, typical heat losses in dwellings are considered taking the United Kingdom and the Russian Federation as examples. The role of adsorption-based technologies for more rational use of heat in buildings is discussed. Fundamentals of inter-seasonal adsorptive heat storage (AHS) are briefly considered. A tentative upper limit of the AHS storage density is estimated. Current practice of inter-seasonal AHS and novel smart adsorbents promising for this emerging technology are overviewed. Since a portion of the heat losses in ventilation system significantly increases in modern buildings, a new approach to regenerating heat and moisture in this system is discussed. Finally, optimization trends of the AHS in buildings are briefly considered.

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Section: Adsorptive Inter-seasonal Heat Storagementioning

confidence: 99%

Current progress in adsorption technologies for low-energy buildings

Aristov

2015

Future Cities and Environment

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“…Many researchers have been working on achieving high performance of rotary wheel heat recovery. The optimal values of length and porosity can be obtained through the numerical model from Dallaire et al [13]. The schematic representation of the optimal rotary wheel is shown in Figure 3 [13].…”

Section: Introductionmentioning

confidence: 99%

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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“…Heidari-Kaydan and Hajidavalloo conducted a 3D simulation of a rotary heat exchanger and analyzed its performance based on the materials and rotating speed [22]. A conceptual optimization of a rotary heat exchanger was performed by Dallaire et al [23]. Recently, a rotary heat exchanger considering the shape of the heating element was studied [24].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

et al. 2017

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Gas-gas heaters (GGHs) are used to reheat gases through desulfurization in coal-fired power plants to reduce low-temperature corrosion and white smoke. Wrinkled heating elements are installed inside the GGH to perform effective heat exchange. An optimization study of the heating element shape was conducted to reduce the differential pressure effectively and improve performance. An integrated analysis model was applied. Based on actual operational data, a computational fluid dynamic analysis was conducted on the L-type heating element and GGH system. The experiments applied the optimal latin hypercube sampling method, and numerical analysis was performed for each sample. Based on the response surface, the result of the sample was optimized through the pointer algorithm. For the integrated analysis model, validation was performed by comparison with the actual operational data, and the thermal-fluid characteristics of the heating element and GGH system were analyzed to set three parameters: plate angle, undulated angle, and pitch 1. From the optimization result, increases in the undulated angle and pitch 1 reduce the pressure drop by widening the heating element cross section. By increasing the plate angle, the heat transfer area is secured and the reduced heat transfer coefficient is compensated, improving the GGH performance.

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Conceptual optimization of a rotary heat exchanger with a porous core

Cited by 46 publications

References 22 publications

Current progress in adsorption technologies for low-energy buildings

Current progress in adsorption technologies for low-energy buildings

Review of Heat Recovery Technologies for Building Applications

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

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