An approach to determine infiltration characteristics of building entrance equipped with air curtains

Wang, Liangzhu; Zhong, Zhipeng

doi:10.1016/j.enbuild.2014.02.020

Cited by 54 publications

(30 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study of the use of air curtains to avoid contaminant spreading has been reported, for tobacco smoke control, 17,18 for operating rooms, 7,[19][20][21][22][23][24] in offices, 25 for protection of art works in museums and of cultural heritage, 26,27 in personalized air curtains, 28 in open refrigerated display cabinets [29][30][31] and in public transportation. 32 The studies on the performance of air curtains have been based on CFD models, 25,27,28,31,[33][34][35][36] on semi-analytical models, 16,37 and on experiments. 3,15,[38][39][40][41][42][43] Qi et al 33 presented a parametric study about air curtain performance.…”

Section: Introductionmentioning

confidence: 99%

Full-size experimental assessment of the aerodynamic sealing of air curtains for particulate matter

Viegas

Kaluzny²,

Durand³

et al. 2020

Building Services Engineering Research and Technology

View full text Add to dashboard Cite

An air curtain is used to ensure an adequate separation between two compartments that is aimed to restrict, a clean one and a contaminated one. The air curtain performance is improved with the use of an air extraction from the “contaminated” compartment. The aerodynamic sealing of an optimized air curtain is assessed regarding particulate matter. The evaluation using visual assessment of the aerodynamic sealing using a cold smoke source is validated against PM 10 detection. It is shown that the air curtain presents a good aerodynamic sealing for the particulate of PM10 and PM2.5 classes and that the visual assessment method can lead to similar results. An equation was obtained with a view to be used to predict the level of aerodynamic sealing of the air curtain when the exhaust rate becomes too low. Another equation was obtained for predicting the average velocity through the door protected by the air curtain required to obtain an aerodynamic sealing, as a function of the jet parameters (nozzle average velocity and thickness). These test results prove that the air curtain, complemented with an air exhaust from the “contaminated compartment”, is suitable to provide an acceptable aerodynamic sealing for the particulate matter. Practical application: The findings of this research are applicable when it is necessary to retain the contamination due to particulate matter using a soft boundary, as air plane jets. This is applicable to medical care centres to reduce the possibility of contamination due to bacteria between different compartments or in pharmaceutical process units to avoid cross contamination among them.

show abstract

Section: Introductionmentioning

confidence: 99%

Full-size experimental assessment of the aerodynamic sealing of air curtains for particulate matter

Viegas

Kaluzny²,

Durand³

et al. 2020

Building Services Engineering Research and Technology

View full text Add to dashboard Cite

show abstract

“…Aside from building entrances, air curtains are used for diverse applications such as refrigerated storages [24,25], tunnels [26], and train stations [27]. Many studies [28,29] have evaluated air curtain airflow characteristics and performance. An infiltration model was developed by [29] for doors with air curtains.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Effect of Roof Cooling and Air Curtain Gates on Thermal and Wind Conditions in Stadiums for Hot Climates

2021

View full text Add to dashboard Cite

To host the 2022 FIFA World Cup, Qatar is facing the greatest challenge in balancing the energy consumptions for cooling the stadiums and the thermal comfort for both players and spectators. Previous studies have not considered using a combined configuration of air curtain and roof cooling supply slot in stadiums to prevent the infiltration of outside hot air and reduce the cooling system’s energy consumption. This paper presents a Computational Fluid Dynamics (CFD) study of thermal and wind modeling around a baseline stadium and simulates the cooling scenarios of air curtains and roof cooling along with the energy consumption estimations for the World Cup matches using Building Energy Simulation (BES). Sensitivity analysis of different supply speeds and supply temperatures of air curtain gates and roof cooling was carried out, and the results showed that scenario six, which provides supply air of 25 m/s and 20 m/s at the roof and air curtain gates with a supply temperature of 10 °C, demonstrates optimal thermal performances on both the spectator tiers and the pitch. Compared with the baseline stadium performance, the average reductions in temperature on the pitch and spectator tiers under scenario six could reach 15 °C and 14.6 °C. The reductions in the Predicted Percentage of Dissatisfied values for the upper and lower tiers as well as the pitch were 63%, 74%, and 78%. In terms of the estimated energy consumptions, scenario six would consume electric energy per match at a rate of 25.5 MWh compared with 22.8 MWh for one of the stadiums in the 2010 South Africa World Cup and 42.0 MWh for the 2006 Germany World Cup. Future research is recommended to explore the influence of supply angle on air curtain gates and roof cooling supply slots’ performances.

show abstract

“…ACs are applied in many practical applications, for example, at entrances of buildings and refrigerated rooms to reduce heat losses (e.g. Wang and Zhong 2014;Goubran et al 2016;Gonçalves et al 2019;Yang et al 2019) and in laboratories or operating theatres (e.g. Nino et al 2011;Chen et al 2013;Zhai and Osborne 2013) to reduce contamination hazard.…”

Section: Introductionmentioning

confidence: 99%

Minimum momentum flux ratio required to prevent air curtain breakthrough in case of cross-curtain pressure gradients: CFD versus analytical equation

Khayrullina¹,

Hooff

Ruiz

et al. 2020

Build. Simul.

View full text Add to dashboard Cite

This paper presents a numerical study on the required momentum flux ratio to prevent air curtain breakthrough in case of cross-curtain (i.e. cross-jet) pressure gradients. 2D steady Reynolds-averaged Navier-Stokes (RANS) CFD simulations with the RNG k-ε turbulence model are employed for jet Reynolds numbers ranging from 5,000 to 30,000. First, the computational model is validated based on particle image velocimetry (PIV) measurements. Second, the influence of several jet parameters on the separation efficiency is evaluated for a moderate cross-jet pressure difference of 10 Pa. These are the ratio of the jet discharge momentum flux to the jet cross-flow momentum flux (momentum flux ratio), the jet height-to-width ratio and the jet discharge angle. Finally, the minimum deflection modulus to prevent jet breakthrough and the corresponding momentum flux ratio by an analytical equation and by CFD are compared. The results show that, for the configuration under study: (1) jets with the smallest height-to-width ratios (β = 18) provide the highest separation efficiency; (2) inclined jets with discharge angles α0 = 5° and 10° provide slightly higher separation efficiency than straight jets (α0 = 0°) and jets with α0 = 20°; (3) the maximum modified separation efficiency is reached at lower momentum flux ratios for jets with smaller height-to-width ratios and for inclined jets; (4) the analytical and CFD values of the optimal momentum flux ratio differ with up to 31.2%. This study shows how the separation efficiency of air curtains can be improved by adjusting certain jet parameters.

show abstract

An approach to determine infiltration characteristics of building entrance equipped with air curtains

Cited by 54 publications

References 11 publications

Full-size experimental assessment of the aerodynamic sealing of air curtains for particulate matter

Full-size experimental assessment of the aerodynamic sealing of air curtains for particulate matter

Effect of Roof Cooling and Air Curtain Gates on Thermal and Wind Conditions in Stadiums for Hot Climates

Minimum momentum flux ratio required to prevent air curtain breakthrough in case of cross-curtain pressure gradients: CFD versus analytical equation

Contact Info

Product

Resources

About