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A Simplified Relation Between Hot Layer Height and Opening Mass Flow

Johansson, Nils LU and Van Hees, Patrick LU (2014) 11th International Symposium on Fire Safety Science In [Host publication title missing]
Abstract
The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper.

The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot... (More)
The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper.

The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot layer height in a compartment fire with a predefined heat release rate. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
fire dynamics, mass flow, zone model, hot layer height
in
[Host publication title missing]
pages
12 pages
publisher
The International Association of Fire Safety Science
conference name
11th International Symposium on Fire Safety Science
external identifiers
  • Scopus:84975147949
language
English
LU publication?
yes
id
fd17959b-d155-416b-9c9c-bf34fa1cd36f (old id 4301135)
alternative location
http://www.iafss.org/publications/fss/11/106/view
date added to LUP
2014-03-10 13:18:47
date last changed
2016-10-13 04:39:53
@misc{fd17959b-d155-416b-9c9c-bf34fa1cd36f,
  abstract     = {The mass flow of air through an opening in a well-mixed compartment fire can be calculated with a simple expression. Similar simple models are lacking for the stratified pre-flashover case. Usually an advanced computer model is required to calculate the mass flow through an opening in a pre-flashover compartment fire. However, two equations for the opening mass flow through an opening are presented and validated in this paper. <br/><br>
The presented equations are predominantly valid for temperatures above 200°C and predictions with the equations are shown to be within 10% of results from computer simulations and experimental measurements. The equations can also be combined with existing plume models in order to give an estimate of the hot layer height in a compartment fire with a predefined heat release rate.},
  author       = {Johansson, Nils and Van Hees, Patrick},
  keyword      = {fire dynamics,mass flow,zone model,hot layer height},
  language     = {eng},
  pages        = {12},
  publisher    = {ARRAY(0xa1fd7d8)},
  series       = {[Host publication title missing]},
  title        = {A Simplified Relation Between Hot Layer Height and Opening Mass Flow},
  year         = {2014},
}