Pressure loss of flexible ventilation ducts for residential ventilation: Absolute roughness and compression effect

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F21%3A00352712" target="_blank" >RIV/68407700:21220/21:00352712 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.jobe.2021.103320" target="_blank" >https://doi.org/10.1016/j.jobe.2021.103320</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jobe.2021.103320" target="_blank" >10.1016/j.jobe.2021.103320</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Pressure loss of flexible ventilation ducts for residential ventilation: Absolute roughness and compression effect

Popis výsledku v původním jazyce

The pressure loss of a duct affects the functionality of the ventilation equipment, the noise and especially the consumption of electricity to drive the fans. In addition, the pressure drop of the pipe is an important piece of information that serves to correctly design the ventilation system. The aim of the study is to determine the pressure drop of flexible hoses of relatively small diameters of 63–160 mm, used mainly for residential ventilation and to study the effect of compression. Four types of ducts, which differ in terms of the shape and material used, were subjected to experimental investigations. Based on the pressure loss measurement, the friction factor f and absolute roughness ε of the flexible ducts in the fully extended state were evaluated. The absolute roughness of the pipe ε varies over a wide range of values (from 0.04 to 2) depending on the material used. It was experimentally confirmed that the plastic ducts behave almost hydraulically smooth in the extended state. The effect of compression on the pressure drop was monitored in two ducts formed by a spirally wound wire. It was found that the pressure drop increases almost linearly with the increasing compression. It is clear from the results that the effect of compression is a major problem for small diameters (80–160 mm). For a compression factor of 15%, the pressure drop of the flexible ducts is 4–8 times higher than in the fully extension state. The key benefit is the knowledge of the pressure loss of flexible air ducts of small diameters depending on the compression ratio.

Název v anglickém jazyce

Pressure loss of flexible ventilation ducts for residential ventilation: Absolute roughness and compression effect

Popis výsledku anglicky

The pressure loss of a duct affects the functionality of the ventilation equipment, the noise and especially the consumption of electricity to drive the fans. In addition, the pressure drop of the pipe is an important piece of information that serves to correctly design the ventilation system. The aim of the study is to determine the pressure drop of flexible hoses of relatively small diameters of 63–160 mm, used mainly for residential ventilation and to study the effect of compression. Four types of ducts, which differ in terms of the shape and material used, were subjected to experimental investigations. Based on the pressure loss measurement, the friction factor f and absolute roughness ε of the flexible ducts in the fully extended state were evaluated. The absolute roughness of the pipe ε varies over a wide range of values (from 0.04 to 2) depending on the material used. It was experimentally confirmed that the plastic ducts behave almost hydraulically smooth in the extended state. The effect of compression on the pressure drop was monitored in two ducts formed by a spirally wound wire. It was found that the pressure drop increases almost linearly with the increasing compression. It is clear from the results that the effect of compression is a major problem for small diameters (80–160 mm). For a compression factor of 15%, the pressure drop of the flexible ducts is 4–8 times higher than in the fully extension state. The key benefit is the knowledge of the pressure loss of flexible air ducts of small diameters depending on the compression ratio.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Building Engineering

ISSN

2352-7102

e-ISSN

2352-7102

Svazek periodika

44

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

000706940600002

EID výsledku v databázi Scopus

2-s2.0-85122689741