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Simulering av luftflöden genom ventilationsdon
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Numerical Analysis, NA.
2013 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Simulation of Air Flow Through Ventilation Ducts (English)
Abstract [sv]

I rapporten undersöks i vad mån det går att simulera luftflödet genom ett ventilationsdon och därigenom bestämma en k-faktor, vilken anger förhållandet mellan luftflödet och kvadratroten ur tryckfallet över en strypning.

En tvådimensionell axelsymmetrisk modell har använts för att simulera ett irisspjäll utan böjar på luftkanalen. En tredimensionell modell har använts för att simulera en 180°°-böj.

Som jämförelser till simuleringarna har praktiska uppmätningar används. Även jämförelser med andra simuleringar har gjorts.

Slutsatsen är att en simulering av den här 180°0-böjen ger för stora fel (lokalt omkring 20 %, men oftast mindre än 10 %) för att vara en användbar metod i samband med ”obligatorisk ventilationskontroll” (OVK). Simuleringen med irisspjäll och raka kanaler ger ett maximalt fel på mellan 3 % och 10 %. Efter ytterligare studier är det tänkbart att metoden kan bli praktiskt användbar.

Abstract [en]

In this report I study the airflow throuth ventilation ducts. By numerical simulation, the so-called k-factor has been estimated. The k-factor is the quotient of the airflow volume and the square root of the pressure drop over the duct.

A two dimensional axial symmetric model has been used to simulate an iris damper connected to a straight pipe. A three dimensional model has been used to simulate a pipe with a 18°00 bend. The simulations have been compared to practical measurements and also to other simulations.

The conclusion is that the result of a simulation of this 180°0 bend have errors that are too large (locally around 20 %, but usually less than 10 %) to be useful in a context of ”obligatorisk ventilationskontroll” (OVK). The result of the simulation of the iris damper with a straight pipe gives a maximum error between 3 % and 10 %. After further investigations, it may be possible that this method will be useful

Place, publisher, year, edition, pages
2013. , 53 p.
Series
TRITA-MAT-E, 2013:45
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-129374OAI: oai:DiVA.org:kth-129374DiVA: diva2:652389
Subject / course
Numerical Analysis
Educational program
Master of Science - Scientific Computing
Supervisors
Examiners
Available from: 2013-09-30 Created: 2013-09-27 Last updated: 2013-09-30Bibliographically approved

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