Air Inlet Angle Effects in Swirling Diffuser of UFAD Systems on Micron Particles Pattern Distribution

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TAHERI M.; Afzalian M.; ZOLFAGHARI S.A.; HASSANZADEH H.

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Journal: Modares Mechanical Engineering Year:2019 | Volume:19 | Issue:12 Page(s): 3083-3093

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Title

Air Inlet Angle Effects in Swirling Diffuser of UFAD Systems on Micron Particles Pattern Distribution

Author(s)

TAHERI M. | Afzalian M. | ZOLFAGHARI S.A. | HASSANZADEH H. | Issue Writer Certificate

Keywords

Thermal ComfortQ2

Particle DistributionQ1

Swirling DiffuserQ1

Indoor Air QualityQ1

Abstract

Particle pollutants in the indoor environment are a serious threat to human health. Therefore, it is necessary to recognition, investigation, and controls of the distribution of these particles in the indoor environment. In the present research, the effect of air inlet angle of Swirling Diffusers in UFAD systems has been investigated on micron particles pattern distribution by considering the Thermal Comfort condition. For analyzing the fluid flow and Particle Distribution, the development of OpenFoam solver by the Eulerian-Lagrangian method has been used. The twonode model of Gauge has been used for predicting the Thermal Comfort conditions. Inlet angles are set in three cases of 30, 45 and 60. Based on the results, in all three cases, the TSENS index is in the Thermal Comfort zone. However, by changing the swirling angle from 30 to 60, the vertical temperature difference can be reduced about 1℃ . Investigation of changing the inlet angle shows that at inlet angle of 30 and 60 degrees, the percentage of particles exited with 2. 5 micrometers diameter were 32% and 55% of the total particles, respectively. In other words, increasing the inlet air angle can lead to exit more amount of any size of particles from the room. In addition, by increasing particles size, larger particles removed faster from the breathing zone, and smaller particles will remain longer time in the air. Therefore, smaller particles have a greater impact on Indoor Air Quality.

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APA: Copy

TAHERI, M., Afzalian, M., ZOLFAGHARI, S.A., & HASSANZADEH, H.. (2019). Air Inlet Angle Effects in Swirling Diffuser of UFAD Systems on Micron Particles Pattern Distribution. MODARES MECHANICAL ENGINEERING, 19(12 ), 3083-3093. SID. https://sid.ir/paper/179118/en

Vancouver: Copy

TAHERI M., Afzalian M., ZOLFAGHARI S.A., HASSANZADEH H.. Air Inlet Angle Effects in Swirling Diffuser of UFAD Systems on Micron Particles Pattern Distribution. MODARES MECHANICAL ENGINEERING[Internet]. 2019;19(12 ):3083-3093. Available from: https://sid.ir/paper/179118/en

IEEE: Copy

M. TAHERI, M. Afzalian, S.A. ZOLFAGHARI, and H. HASSANZADEH, “Air Inlet Angle Effects in Swirling Diffuser of UFAD Systems on Micron Particles Pattern Distribution,” MODARES MECHANICAL ENGINEERING, vol. 19, no. 12 , pp. 3083–3093, 2019, [Online]. Available: https://sid.ir/paper/179118/en

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