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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Building Engineering

ISSN

2352-7102

e-ISSN

2352-7102

Volume of the periodical

44

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

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UT code for WoS article

000706940600002

EID of the result in the Scopus database

2-s2.0-85122689741