The Experts below are selected from a list of 25458 Experts worldwide ranked by ideXlab platform
Francis Allard - One of the best experts on this subject based on the ideXlab platform.
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Natural Ventilation Potential of Urban Buildings
International journal of ventilation, 2016Co-Authors: M. Germano, Christian Ghiaus, C.-a. Roulet, Francis AllardAbstract:The design of a building should provide the flow paths needed for Natural Ventilation. Therefore, the decision to apply Natural Ventilation should be taken early in the building design process, when little information is available for airflow estimation. To deal with this lack of data, a semi-qualitative method to assess the potential of an urban site to host a Naturally ventilated building is proposed. First, Natural Ventilation driving forces and constraints are assessed by using comfort criteria, statistical meteorological data and user-provided information. Then, the site of interest is compared to other, well known sites using criteria related to both Natural Ventilation driving forces and constraints. This method compares and ranks the site within the base sites using a qualitative multicriteria analysis procedure. The result of the comparison shows if the assessed site has a higher potential for application of Natural Ventilation than a set of known sites.
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Natural Ventilation in the urban environment : assessment and design
2012Co-Authors: Christian Ghiaus, Francis AllardAbstract:Energy in the Urban Built Environment: The Role of Natural Ventilation * The Role of Ventilation * The Physics of Natural Ventilation * Wind and Temperature in the Urban Environment * Noise Level and Natural Ventilation Potential in Street Canyons * Outdoor-Indoor Pollutant Transfer * Strategies for Natural Ventilation * Specific Devices for Natural Ventilation * The Design of Optimal Openings * Natural Ventilation Potential * Whole Life Costing of Ventilation Options *
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Natural Ventilation in the Urban Environment
Building Ventilation, 2006Co-Authors: Christian Ghiaus, Francis AllardAbstract:Natural Ventilation in the urban environment , Natural Ventilation in the urban environment , کتابخانه دیجیتالی دانشگاه علوم پزشکی و خدمات درمانی شهید بهشتی
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Urban environment influence on Natural Ventilation potential
Building and Environment, 2006Co-Authors: Christian Ghiaus, Francis Allard, Christos Georgakis, Mattheos Santamouris, F. NicolAbstract:Natural Ventilation is less effective in urban than in rural environment, especially in street canyons. Reduced wind velocity, urban heat island, noise and pollution, are considered to be important barriers to its application in urban environment. To quantify their effect on Ventilation, wind, temperature, noise attenuation and outdoor–indoor pollution transfer were measured for a large variation range and for various types of urban configuration. The models obtained can be used in the initial stages of building design in order to assess the viability of Natural Ventilation in urban environment, especially in street canyons.
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Natural Ventilation in buildings - a design handbook
1998Co-Authors: Francis Allard, Mattheos SantamourisAbstract:The benefits - environmental, economic, and for occupants' comfort and health - of ventilating buildings Naturally, rather than mechanically, are becoming increasingly recognised and sought after. Approaches can be high-tech or low-tech, but always need to be part of an integrated design approach. A range of technical barriers, such as building codes, fire regulations and acoustics, also need to be taken into account. This new handbook describes the real potential of Natural Ventilation, its appropriate use, the design and dimensioning methodologies, the need for an integrated design approach, and how to overcome barriers. It includes a CD with software to assist in the calculation of airflow rate in Natural Ventilation configurations. The book will provide essential design information for all architects, building engineers and other building design professionals. Contents: Introduction. Fundamentals of Natural Ventilation. Prediction methods. Diagnostic techniques. Critical barriers. Design guidelines and technical solutions for Natural Ventilation. Naturally ventilated buildings. The AIOLOS software. (author)
Christian Ghiaus - One of the best experts on this subject based on the ideXlab platform.
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Natural Ventilation Potential of Urban Buildings
International journal of ventilation, 2016Co-Authors: M. Germano, Christian Ghiaus, C.-a. Roulet, Francis AllardAbstract:The design of a building should provide the flow paths needed for Natural Ventilation. Therefore, the decision to apply Natural Ventilation should be taken early in the building design process, when little information is available for airflow estimation. To deal with this lack of data, a semi-qualitative method to assess the potential of an urban site to host a Naturally ventilated building is proposed. First, Natural Ventilation driving forces and constraints are assessed by using comfort criteria, statistical meteorological data and user-provided information. Then, the site of interest is compared to other, well known sites using criteria related to both Natural Ventilation driving forces and constraints. This method compares and ranks the site within the base sites using a qualitative multicriteria analysis procedure. The result of the comparison shows if the assessed site has a higher potential for application of Natural Ventilation than a set of known sites.
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Natural Ventilation in the urban environment : assessment and design
2012Co-Authors: Christian Ghiaus, Francis AllardAbstract:Energy in the Urban Built Environment: The Role of Natural Ventilation * The Role of Ventilation * The Physics of Natural Ventilation * Wind and Temperature in the Urban Environment * Noise Level and Natural Ventilation Potential in Street Canyons * Outdoor-Indoor Pollutant Transfer * Strategies for Natural Ventilation * Specific Devices for Natural Ventilation * The Design of Optimal Openings * Natural Ventilation Potential * Whole Life Costing of Ventilation Options *
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Natural Ventilation in the Urban Environment
Building Ventilation, 2006Co-Authors: Christian Ghiaus, Francis AllardAbstract:Natural Ventilation in the urban environment , Natural Ventilation in the urban environment , کتابخانه دیجیتالی دانشگاه علوم پزشکی و خدمات درمانی شهید بهشتی
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Urban environment influence on Natural Ventilation potential
Building and Environment, 2006Co-Authors: Christian Ghiaus, Francis Allard, Christos Georgakis, Mattheos Santamouris, F. NicolAbstract:Natural Ventilation is less effective in urban than in rural environment, especially in street canyons. Reduced wind velocity, urban heat island, noise and pollution, are considered to be important barriers to its application in urban environment. To quantify their effect on Ventilation, wind, temperature, noise attenuation and outdoor–indoor pollution transfer were measured for a large variation range and for various types of urban configuration. The models obtained can be used in the initial stages of building design in order to assess the viability of Natural Ventilation in urban environment, especially in street canyons.
Qingyan Chen - One of the best experts on this subject based on the ideXlab platform.
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Validation of a fast fluid dynamics program for simulating Natural Ventilation in buildings.
2013Co-Authors: Mingang Jin, Qingyan Chen, Wangda ZuoAbstract:Natural Ventilation is a sustainable building technology that can provide good indoor environment and save energy. The application of Natural Ventilation in buildings requires a careful design in the early design phase, and simple, fast design tools are highly needed. As an intermediate approach between computational fluid dynamics (CFD) and multi-zone model, fast fluid dynamics (FFD) can provide informative airflow information with a speed of 15 times faster than the laminar CFD so that it could be a potential design tool for Natural Ventilation. This study thus evaluated the performance of FFD for simulating Natural Ventilation. The FFD was validated with three cases representing Natural Ventilation with different driven forces: (1) wind-driven Natural Ventilation through a scaled building model; (2) wind-driven Natural Ventilation under different wind direction through a full scale building with partitions; (3) buoyancy-driven single-sided Natural Ventilation in an environmental chamber with a large opening. From comparing the results predicted by FFD and the experimental data, this study found that the FFD was capable of predicting main air flow feature and Ventilation rate with reasonable accuracy for the wind-driven or buoyancy-driven Natural Ventilation in buildings. .
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Validation of CFD Simulations for Natural Ventilation
International Journal of Ventilation, 2004Co-Authors: Yi Jiang, Camille Allocca, Qingyan ChenAbstract:AbstractNatural Ventilation, which may provide occupants with good indoor air quality and a high level of thermal comfort, and reduce energy costs, has become an important sustainable strategy in building designs. This investigation used three computational fluid dynamics (CFD) models: steady Reynolds averaged Navier-Stokes equation (RANS) modelling, unsteady RANS modelling, and large eddy simulation (LES) to study both wind-driven and buoyancy-driven Natural Ventilation. The validation of the CFD models used the experimental data of wind-driven Natural Ventilation, obtained from a wind tunnel with a scaled building model, and the data of buoyancy-driven Ventilation, obtained from a full-scale chamber. LES results seem to be more accurate and informative than those obtained with the RANS modelling, but with severe penalty in computing time. This investigation has also analysed turbulence energy spectra of Natural Ventilation. The peak turbulence energy for wind-driven Natural Ventilation is at frequencies...
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design analysis of single sided Natural Ventilation
Energy and Buildings, 2003Co-Authors: Camille Allocca, Qingyan Chen, Leon R GlicksmanAbstract:Natural Ventilation is an effective measure to save energy consumed in buildings and to improve indoor air quality. This investigation studied single-sided Natural Ventilation by using a computational fluid dynamics (CFD) model, together with analytical and empirical models. The CFD model was applied to determine the effects of buoyancy, wind, or their combination on Ventilation rates and indoor conditions. For buoyancy-driven flow, the CFD results are within a 10% difference from the semi-analytical results. For combined wind- and buoyancy-driven flow, CFD may have underpredicted the empirical model results by approximately 25%. This investigation also studied the effects of opposing buoyancy and wind forces.
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Natural Ventilation Design for Houses in Thailand
Energy and Buildings, 2001Co-Authors: Chalermwat Tantasavasdi, Jelena Srebric, Qingyan ChenAbstract:This paper explores the potential of using Natural Ventilation as a passive cooling system for new house designs in Thailand. The characteristics of past and present Thai houses are analyzed in terms of climate, culture, and technology. Based on the thermal comfort requirements for the Thai people and the climate conditions in Bangkok, the study found that it is possible to use Natural Ventilation to create a thermally comfortable indoor environment in houses in a Bangkok suburb during 20% of the year. This study also develops comprehensive design guidelines for Natural Ventilation at both the site planning and individual house levels by using computational fluid dynamics.
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Design of Natural Ventilation with CFD
Sustainable Urban Housing in China, 1Co-Authors: Qingyan ChenAbstract:As the previous chapter demonstrated, if a building is properly designed, Natural Ventilation can provide both a comfortable and healthy indoor environment as well as energy savings. Most architects and designers know about the principles of passive solar heating and can indicate how they desire small buildings to also take advantage of Natural Ventilation, as shown in Figure 1. Natural Ventilation and thermal comfort, however, are difficult to understand and model, even for simple buildings. It is important that the architects and engineers collaborate early in the design process when key decisions about master planning and building geometry are made.
F. Nicol - One of the best experts on this subject based on the ideXlab platform.
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Urban environment influence on Natural Ventilation potential
Building and Environment, 2006Co-Authors: Christian Ghiaus, Francis Allard, Christos Georgakis, Mattheos Santamouris, F. NicolAbstract:Natural Ventilation is less effective in urban than in rural environment, especially in street canyons. Reduced wind velocity, urban heat island, noise and pollution, are considered to be important barriers to its application in urban environment. To quantify their effect on Ventilation, wind, temperature, noise attenuation and outdoor–indoor pollution transfer were measured for a large variation range and for various types of urban configuration. The models obtained can be used in the initial stages of building design in order to assess the viability of Natural Ventilation in urban environment, especially in street canyons.
C.-a. Roulet - One of the best experts on this subject based on the ideXlab platform.
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Natural Ventilation Potential of Urban Buildings
International journal of ventilation, 2016Co-Authors: M. Germano, Christian Ghiaus, C.-a. Roulet, Francis AllardAbstract:The design of a building should provide the flow paths needed for Natural Ventilation. Therefore, the decision to apply Natural Ventilation should be taken early in the building design process, when little information is available for airflow estimation. To deal with this lack of data, a semi-qualitative method to assess the potential of an urban site to host a Naturally ventilated building is proposed. First, Natural Ventilation driving forces and constraints are assessed by using comfort criteria, statistical meteorological data and user-provided information. Then, the site of interest is compared to other, well known sites using criteria related to both Natural Ventilation driving forces and constraints. This method compares and ranks the site within the base sites using a qualitative multicriteria analysis procedure. The result of the comparison shows if the assessed site has a higher potential for application of Natural Ventilation than a set of known sites.
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Multicriteria assessment of Natural Ventilation potential
Solar Energy, 2006Co-Authors: M. Germano, C.-a. RouletAbstract:Abstract A method is proposed to assess the Natural Ventilation potential by taking into account the most comprehensive set of factors involved in Natural Ventilation. These factors are either driving forces, such as wind pressure and stack effect, or constraints, like noise pollution and atmospheric pollution. The process considers these factors in an ordinal qualitative scale and gives its result in that scale. This bypasses the problem of the inaccuracy of some parameters, which can be very high, especially in urban environment and in the pre-design phase of a construction project. Actually, the method is particularly suitable for designers intending to take early-stage decisions.
