Abstract:
UNLABELLED:With the capability to improve indoor air quality while simultaneously reducing energy demand, displacement ventilation is becoming popular. However, the numerical simulation of air distribution in an indoor space with displacement ventilation using computational fluid dynamics (CFD) is challenging because of the complexity of air diffuser geometry and the complicated airflow pattern generated. Typical air diffusers used for displacement ventilation systems include, but are not limited to, quarter-circular-perforated, grille, floor-perforated, and swirl diffusers. None of them can be treated as a simple opening in CFD simulations because their effective area ratios are small. We have developed a new, simple method to describe those diffusers by directly specifying the correct jet momentum from the diffusers while adjusting the airflow rate by changing the effective areas. This is done by setting some CFD cells for a diffuser with a certain momentum, while other cells are randomly blocked. By implementing this method into a commercial CFD program, this study used the method to simulate air distributions in an office and a workshop with those diffusers under cooling or heating conditions. The distributions of air velocity, temperature, and airborne contaminant concentration are in good agreement with the corresponding experimental data obtained from an environmental chamber. PRACTICAL IMPLICATIONS:This paper presents a simplified method for description of complex diffusers in computational fluid dynamics simulation of displacement ventilation at high computational efficiency. It may be used to assist the design and analysis of air distribution for displacement ventilation as well as other types of ventilation with complex diffusers.
journal_name
Indoor Airjournal_title
Indoor airauthors
Zhang TT,Lee K,Chen QYdoi
10.1111/j.1600-0668.2009.00590.xsubject
Has Abstractpub_date
2009-06-01 00:00:00pages
255-67issue
3eissn
0905-6947issn
1600-0668pii
INA590journal_volume
19pub_type
杂志文章相关文献
INDOOR AIR文献大全abstract:UNLABELLED:Indoor air organic compounds were continuously monitored during 3 years in new and older homes which were voluntarily selected throughout countries. The levels of volatile organic compounds (VOCs) in the new homes decreased markedly after 1 year, and steady emissions of VOCs were obtained in the initial mont...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2005.00408.x
更新日期:2006-04-01 00:00:00
abstract::Indoor air quality (IAQ), as determined by the concentrations of indoor air pollutants, can be predicted using either physically based mechanistic models or statistical models that are driven by measured data. In comparison with mechanistic models mostly used in unoccupied or scenario-based environments, statistical m...
journal_title:Indoor air
pub_type: 杂志文章,评审
doi:10.1111/ina.12580
更新日期:2019-09-01 00:00:00
abstract::The objectives of this study were (i) to assess the determinants that affect concentrations of the bacterial cell wall components 3-hydroxy fatty acids (3-OH FAs) and muramic acid and of total viable bacteria and actinomycetes in house dust; and (ii) to examine the seasonal variation and reproducibility of these bacte...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12141
更新日期:2015-06-01 00:00:00
abstract::The knowledge of exposure to the airborne particle emitted from three-dimensional (3D) printing activities is becoming a crucial issue due to the relevant spreading of such devices in recent years. To this end, a low-cost desktop 3D printer based on fused deposition modeling (FDM) principle was used. Particle number, ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12310
更新日期:2017-03-01 00:00:00
abstract::While household air pollution from biomass fuel combustion has been linked to cardiovascular disease, the effects on cardiac structure and function have not been well described. We sought to determine the association between biomass fuel smoke exposure and cardiac structure and function by transthoracic echocardiograp...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12362
更新日期:2017-07-01 00:00:00
abstract::Dispersion characteristics of expiratory aerosols were investigated in an enclosure with two different idealized airflow patterns: the ceiling-return and the unidirectional downward. A multiphase numerical model, which was able to capture the polydispersity and evaporation features of the aerosols, was adopted. Experi...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2006.00426.x
更新日期:2006-08-01 00:00:00
abstract::Variable methods of dust collection may lead to uncertainty in the measurement of biomarkers. The purpose of this study was to examine the effect of two different dust collection devices on dust weight, Der p 1, Fel d 1, and endotoxin levels. We compared: (1) a nylon mesh sock inserted between the furniture attachment...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2004.00253.x
更新日期:2004-06-01 00:00:00
abstract:UNLABELLED:Early-life exposure to microbial agents may play a protective role in asthma and allergies development. Geographical differences in the prevalence of these diseases exist, but the differences in early-life indoor microbial agent levels and their determinants have been hardly studied. We aimed to describe the...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12017
更新日期:2013-06-01 00:00:00
abstract:UNLABELLED:In this study, single-particle characterization of aerosol particles collected at an underground shopping area was performed for the first time. A quantitative single-particle analytical technique, low-Z particle electron probe X-ray microanalysis, was used to characterize a total of 7900 individual particle...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2010.00677.x
更新日期:2011-02-01 00:00:00
abstract::We assessed 45 multifamily buildings (240 apartments) from Finland and 20 (96 apartments) from Lithuania, out of which 37 buildings in Finland and 15 buildings in Lithuania underwent energy retrofits. Building characteristics, retrofit activities, and energy consumption data were collected, and Indoor Air Quality (IAQ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12555
更新日期:2019-07-01 00:00:00
abstract::We investigated the physicochemical properties (size, shape, elemental composition, and endotoxin) of size resolved particulate matter (PM) collected from the indoor and corridor environments of classrooms. A comparative hazard profiling of these PM was conducted using human microvascular endothelial cells (HMVEC). Ox...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12341
更新日期:2017-05-01 00:00:00
abstract:UNLABELLED:Quasi-ultrafine (quasi-UF) particulate matter (PM(0.25)) and its components were measured in indoor and outdoor environments at four retirement communities in Los Angeles Basin, California, as part of the Cardiovascular Health and Air Pollution Study (CHAPS). The present paper focuses on the characterization...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2009.00620.x
更新日期:2010-02-01 00:00:00
abstract::Personal exposure to total volatile organic compounds (TVOCs), benzene and toluene of 100 Milan office workers was assessed through personal air monitoring at home, in the office, and during commuting. Biological monitoring was performed by measuring blood benzene and toluene concentrations together with urinary trans...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1034/j.1600-0668.2000.010004258.x
更新日期:2000-12-01 00:00:00
abstract::This paper reports the comparison of three measuring methods for quantifying the amount of dust on the inner surface of ventilation ducts: 1) a vacuum test method; 2) a gravimetric tape method; and 3) an optical method. Thirteen recently constructed buildings were selected for the field test in the Helsinki metropolit...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1034/j.1600-0668.2002.120106.x
更新日期:2002-03-01 00:00:00
abstract::Polybrominated diphenyl ethers (PBDEs) are used as flame retardants in furniture foam, electronics, and other home furnishings. A field study was conducted that enrolled 139 households from California, which has had more stringent flame retardant requirements than other countries and areas. The study collected passive...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12130
更新日期:2015-04-01 00:00:00
abstract:UNLABELLED:When considering how people are infected and what can be done to prevent the infections, answers from many disciplines are sought: microbiology, epidemiology, medicine, engineering, and physics. There are many pathways to infection spread, and among the most significant from the epidemiological point of view...
journal_title:Indoor air
pub_type: 杂志文章,评审
doi:10.1111/j.1600-0668.2006.00432.x
更新日期:2006-10-01 00:00:00
abstract:UNLABELLED:Air movement--good or bad? The question can only be answered by those who are exposed when they are exposed. Human perception of air movement depends on environmental factors including air velocity, air velocity fluctuations, air temperature, and personal factors such as overall thermal sensation and activit...
journal_title:Indoor air
pub_type: 杂志文章,评审
doi:10.1111/j.1600-0668.2004.00271.x
更新日期:2004-01-01 00:00:00
abstract::Airborne ultrafine particles (UFP) have been related to adverse health effects, but exposure in vulnerable population groups such as children is still not well understood. We aim to review the scientific literature regarding personal exposure to UFP in different microenvironments in populations until 18 years of age. ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12620
更新日期:2020-01-01 00:00:00
abstract:UNLABELLED:Building-related symptoms in office workers worldwide are common, but of uncertain etiology. One cause may be contaminants related to characteristics of heating, ventilating, and air-conditioning (HVAC) systems. We analyzed data from 97 representative air-conditioned US office buildings in the Building Asses...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2008.00531.x
更新日期:2008-08-01 00:00:00
abstract:UNLABELLED:Continuous emission of unipolar ions has been shown to improve the performance of respirators and stationary filters challenged with non-biological particles. In this study, we investigated the ion-induced enhancement effect while challenging a low-efficiency heating, ventilation and air-conditioning (HVAC) ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2007.00512.x
更新日期:2008-04-01 00:00:00
abstract:UNLABELLED:In this stratified cross-sectional study in eight 'wet' and seven 'dry' schools, 1024 adolescent school children reported potentially building-related symptoms (BRS) in self-administrated questionnaires. From their classrooms dust samples were collected from floors, ventilation ducts, and air; settled dust w...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2005.00356.x
更新日期:2005-01-01 00:00:00
abstract:UNLABELLED:Fumes produced during frying have been implicated as a potential cause for the increased incidence of adenocarcinoma. Particulate matter exposure has also been linked with other pulmonary and coronary disease. This study investigated the contribution of frying in residential settings to ultrafine and fine pa...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2008.00551.x
更新日期:2008-12-01 00:00:00
abstract:UNLABELLED:This paper presents the experimental and numerical modeling of contaminant dispersion in a full-scale environmental chamber with different room air distribution systems. For the experimental modeling, an area source with uniform emissions of a hypothetical contaminant (SF6) from the entire floor surface is d...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2005.00383.x
更新日期:2005-10-01 00:00:00
abstract:UNLABELLED: Ingestion of indoor dust has been acknowledged as an important route of exposure to organic contaminants (OCs). We investigated the presence of polybrominated diphenyl ethers (PBDEs), novel brominated flame retardants (NBFRs), organophosphate flame retardants (OPFRs), polychlorinated biphenyls (PCBs), and ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2011.00757.x
更新日期:2012-06-01 00:00:00
abstract::Endotoxin was measured in air and dust samples collected during four commercial aircraft flights. Samples were analyzed for endotoxin biological activity using the Limulus assay. 3-hydroxy fatty acids (3-OH FA) of carbon chain lengths C10:0-C18:0 were determined in dust by gas chromatography-ion trap tandem mass spect...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1034/j.1600-0668.2003.00175.x
更新日期:2003-06-01 00:00:00
abstract::This article reports the results of an investigation, based on fundamental fluid dynamics and mass transfer theory, carried out to obtain a general understanding of the mechanisms involved in the emissions from building materials in ventilated rooms. In addition, a generally applicable method for the prediction of sur...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1034/j.1600-0668.2001.011003162.x
更新日期:2001-09-01 00:00:00
abstract::The photolysis of HONO has been found to be the oxidation driver through OH formation in the indoor air measurement campaign SURFin, an extensive campaign carried out in July 2012 in a classroom in Marseille. In this study, the INCA-Indoor model is used to evaluate different HONO formation mechanisms that have been us...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/ina.12320
更新日期:2017-03-01 00:00:00
abstract:UNLABELLED:In studying productivity, effects of environmental factors have focused only on performance. However, previous studies of the impact of the environment upon performance of mental tasks generally conclude that productivity research is somewhat confusing because the results are sometimes conflicting. In experi...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2004.00281.x
更新日期:2004-01-01 00:00:00
abstract:UNLABELLED:Electronic cigarette consumption ('vaping') is marketed as an alternative to conventional tobacco smoking. Technically, a mixture of chemicals containing carrier liquids, flavors, and optionally nicotine is vaporized and inhaled. The present study aims at the determination of the release of volatile organic ...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1111/j.1600-0668.2012.00792.x
更新日期:2013-02-01 00:00:00
abstract::Available studies indicate that indoor air pollution (IAP) from household cooking and space heating apparently causes substantial ill-health in developing countries where the majority of households rely on solid fuels (coal or biomass as wood, crop residues, and dung), but there are many remaining uncertainties. To pi...
journal_title:Indoor air
pub_type: 杂志文章
doi:10.1034/j.1600-0668.2002.01137.x
更新日期:2002-09-01 00:00:00