Wind effects on air curtain performance at building entrances

Yang, Senwen; Alrawashdeh, Hatem; Zhang, Cheng; Qi, Dahai; Wang, Liangzhu; Stathopoulos, T.

doi:10.1016/j.buildenv.2019.01.032

Cited by 45 publications

(9 citation statements)

References 23 publications

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“…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. However, it was not developed to assess either the jet or the exhaust parameters that are to be fulfilled to keep the jet in the transition between the optimum condition and the 'inflow breakthrough condition'.…”

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

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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.

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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

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“…The stack velocities ( v s ) were typically varied between 0.4 and 3.6 m/s and the external flow velocities were within the range 1. [11][12][13][14][15][16].…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

“…The determination and analysis of the flow characteristics of full ventilation systems or individual ventilation elements are usually carried out using wind tunnels and/or through numerical simulations. Wind tunnel measurements, using scale models, are convenient to evaluate the wind induced ventilation inside buildings [11][12][13] and the performance of individual ventilation elements under well controlled flow conditions [14][15][16]. Although these experiments are relatively costly, they provide local reliable data using pressure and velocity probes and spatial flow information using Particle Image Velocimetry [17] and flow visualization techniques.…”

Section: Introductionmentioning

confidence: 99%

Flow analysis of a set of ornamental chimney caps designed by Antoni Gaudí

et al. 2020

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We analyzed theoretically and experimentally the performance of the 19 different ornamental caps of the individual chimneys located on the terrace of Palau Güell (Barcelona, Spain) designed by Antoni Gaudí. This set of chimney caps has wide range of external geometries and different number and shapes of openings. Models of the chimney caps were obtained using photogrammetry and 3D printing. Wind tunnel measurements of the pressure inside the stack pipe connected to the cap were performed for different external and stack flow velocities. Two distinct orientations of the external flow with respect to the chimneys were considered. We derived a simple theoretical model, based on the potential flow theory, to relate the non-dimensional pressure reduction in the stack (chimney draft) with the ratio between the external and stack flow velocities. It has been found that the behavior of the chimneys caps predicted by this model is in agreement with the measurements. It has been found that the performance of the chimneys depends mainly on the number of supports of the conical cover of the cap and it is essentially independent on the shape of the cap and on the number and geometry of the openings located on the cap. These conclusions obtained for this particular set of chimneys can be useful for the design of caps for ornamental or general use.

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“…Ref. [39][40][41][42]). Frank and Linden [26,27] explored the separation efficiency as affected by multiple openings in the building envelope [26], as well as of positive buoyant jets originating from heated ACs [27].…”

Section: Introductionmentioning

confidence: 99%