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Numerical Modelling of Water Mist Systems in Protection of Mass Timber Residential Buildings

https://research.thinkwood.com/en/permalink/catalogue2681
Year of Publication
2020
Topic
Fire
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Author
Elsagan, Nour
Ko, Yoon
Publisher
National Research Council Canada
Year of Publication
2020
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Topic
Fire
Keywords
Sprinklers
Fire Suppression
Exposed Timber
Water Mist Systems
Language
English
Research Status
Complete
Summary
"This report presents the findings from a simulation parametric study to investigate the use of water mist systems for a residential compartment fire involving exposed mass timber structures. The fire and suppression models were first validated against experimental data obtained from the NRC fire tests that were conducted under the same project. Seventeen simulations were conducted using Fire Dynamic Simulator (FDS) software. The following parameters were investigated: effect of fuel arrangement and location on fire severity in exposed wood compartment, effect of different finishing on fire severity in compartment, fire and suppression in open space vs compartment, effectiveness of water mist systems in fire suppression in compartments with different finishing. The results show the effectiveness of the water mist system in suppressing the fire in exposed wood compartments where a high heat release is expected due to the high fuel load"--Executive summary, page iv.
Online Access
Free
Resource Link
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Water Mist Systems for Protection of Mass Timber Structures - Phase 2 Residential Fire Suppression Tests

https://research.thinkwood.com/en/permalink/catalogue2682
Year of Publication
2020
Topic
Fire
Moisture
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Author
Ko, Yoon
Elsagan, Nour
Gibbs, Eric
Publisher
National Research Council Canada
Year of Publication
2020
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Rooms
Topic
Fire
Moisture
Keywords
Sprinklers
Water Mist Systems
Fire Suppression
Language
English
Research Status
Complete
Summary
"As an alternative option to conventional sprinkler system, water mist systems are considered for the protection of timber buildings because they use much less amounts of water compared to sprinkler systems. The effectiveness of high pressure water mist (HPWM) and low pressure water mist (LPWM) systems was investigated in comparison to sprinkler systems for a residential fire scenario involving mass timber structures. The most distinct characteristic of the HPWM and LPWM systems was fine water droplets generated from the nozzles, which demonstrated effective smoke cooling in the room. Although the water spray rate of the HPWM was four times lower than that of the sprinkler system, the water mist systems effectively control the fire and maintained the room tenable. Most systems (HPWM, LPWM and sprinklers) tested in this study did not prevent fire damage on the CLT walls, but the HPWM system with a wide spray angle demonstrated rapid fire suppression and protection of the CLT walls. In all tests, a large water pool formed on the floor, which appeared proportional to the total water spray discharge in each test, and the moisture contents measured on the surface and bottom edges of the CLT panels indicated that water can penetrate into the interface between the floor and the wall in a typical CLT assembly"--Executive summary, page 1.
Online Access
Free
Resource Link
Less detail