<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The paper presents the results of the experimental research on the air grills designed to stop backflows in natural ventilation stacks. For each grill pressure drop was measured for different airflow rates, in both flow directions. Two ∅ 100 mm grills working on different principles were tested: one with moving flaps, and one shaped in a way that should greatly increase the hydraulic losses during backflow. For comparison, the ordinary air grill was also tested. The results show that the grill with moving flaps works as intended. With only slightly higher hydraulic losses in the forward direction compared to ordinary grill, it shuts off the backflows almost completely. The other, diffuser-shaped grill doesn’t work as intended. It has very high hydraulic losses in both directions, and the effect of changing the air resistance with the reverse flow is barely noticeable.</p>
</abstract>

The paper presents the results of the experimental research on the air grills designed to stop backflows in natural ventilation stacks. For each grill pressure drop was measured for different airflow rates, in both flow directions. Two ∅ 100 mm grills working on different principles were tested: one with moving flaps, and one shaped in a way that should greatly increase the hydraulic losses during backflow. For comparison, the ordinary air grill was also tested. The results show that the grill with moving flaps works as intended. With only slightly higher hydraulic losses in the forward direction compared to ordinary grill, it shuts off the backflows almost completely. The other, diffuser-shaped grill doesn’t work as intended. It has very high hydraulic losses in both directions, and the effect of changing the air resistance with the reverse flow is barely noticeable.

Air Grilles Designed to Prevent Backflows in Natural Ventilation Stacks – Experimental Investigation

Architecture, Civil Engineering, Environment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The paper presents the results of the experimental research on the air grills designed to stop backflows in natural ventilation stacks. For each grill pressure...

Air Grilles Designed to Prevent Backflows in Natural Ventilation Stacks – Experimental Investigation

Publicado en línea: 20 jul 2023

Páginas: 161 - 169

Recibido: 03 feb 2023

Aceptado: 12 may 2023

DOI: https://doi.org/10.2478/acee-2023-0025

Palabras clave
Natural ventilation, Backflow, Hydraulic losses, Air grill, Air diode

© 2023 Piotr Koper et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Air Grilles Designed to Prevent Backflows in Natural Ventilation Stacks – Experimental Investigation

Publicado en línea: 20 jul 2023

Páginas: 161 - 169

Recibido: 03 feb 2023

Aceptado: 12 may 2023

DOI: https://doi.org/10.2478/acee-2023-0025

Palabras claveNatural ventilation, Backflow, Hydraulic losses, Air grill, Air diode

© 2023 Piotr Koper et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Palabras clave
Natural ventilation, Backflow, Hydraulic losses, Air grill, Air diode