Naslov (srp)

Утицај геометрије елемената за дистрибуцију ваздуха на експанзију ваздушног млаза у системима мешајуће вентилације : докторска дисертација

Autor

Vasić, Mihailo, 1988-

Doprinosi

Živković, Branislav, 1953-
Ilić, Milica M., 1969-
Bajc, Tamara, 1984-
Stevanović, Vladimir, 1960-
Sretenović, Aleksandra, 1986-

Opis (eng)

This paper includes numerical simulations and experimental investigations of the expansionof a turbulent air jet that occurs in mechanical ventilation systems. Indoor air movementhas a major impact on comfort levels and is a serious problem in many air-conditioned orventilated rooms.Air is introduced into the room locally at relatively high velocities and it is generally acceptedthat the resulting jet has the appropriate symmetry and uniformity that are a consequence ofa certain symmetry of the nal devices, and that they only aect its spread. However, partsof the ducts and various attachments for air direction control and volume ow rate balancingcontribute to an uneven velocity eld at the neck of the air terminal devices, which is furtherreected in the resulting jet. The conducted research is dedicated to the issue of asymmetryand uneven ow distribution on air terminal devices that are widely used in HVAC systems.Numerical tests of the air jet generated on the ventilation grille with one row of individuallyadjustable non-diverged blades and with the opposed action blades damper unit were performed.During these tests, the maximum velocity of the jet was observed at dierent distances fromthe outlet. Depending on the damper openness, it would result in jet dierences and therange of propagation in the room.The four-sided ceiling diuser with plenum box and side entry was studied. The unevennessof ow in all directions for dierent types of equalizing elements was observed. The positionand openness of the damper inuence the volume ow rate balancing on the uniformityof the plane jet in slot diusers with a plenum box and side duct connection was alsoconsidered. It will be shown that the above examples, chosen as unavoidable in everydaypractical application and whose inuence is not considered on that occasion, to a greateror lesser extent aect the movement of air in a room. Validation of numerical results wasperformed through experimental measurements and visualization with smoke.

Opis (srp)

Овим радом обухваћене су нумеричке симулације и експериментална испитивања експанзије турбулентног ваздушног млаза који се појавлљује у системима механичке вентилације.

Opis (srp)

Машинство - Термотехника - Примењена механика флуида / Mechanical Еngineering - Thermal power science - Applied fluid mechanics Datum odbrane: 23.11.2021.

Jezik

srpski

Datum

2021

Licenca

Ovo delo je licencirano pod uslovima licence
Creative Commons CC BY-NC-ND 3.0 AT - Creative Commons Autorstvo - Nekomercijalno - Bez prerada 3.0 Austria License.

http://creativecommons.org/licenses/by-nc-nd/3.0/at/legalcode

Predmet

air jet, turbulence, ventilation grille, ceiling diffuser, CFD

ваздушни млаз, турбулрнција, вентилациона решетка, плафонски дифузор CFD