laboratory experiments - fireseat · ignition experiments: furniture and furnishings (fire safety)...
TRANSCRIPT
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Laboratory ExperimentsLaboratory Experiments
Thomas Steinhaus&
Wolfram Jahn
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Contents
• Ignition experiments (pre full scale)
• Tests for use as fire model input
• Fire model input examples(Chapter 6 of the proceedings)
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Tests for use as fire model input:Sofa in Dalmarnock
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Ignition experiments:Furniture and Furnishings (Fire Safety) Regulations
Source: BS 5852:2006 (Figure 14b Model position for ignition source at floor level)
Furniture and Furnishings (Fire Safety) Regulations (from 1988 amended in 1989 and 1993)
BS 5852Methods of test for assessment of the ignitability of upholstered seating by
smouldering and flaming ignition sources
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Ignition experiments:effective fire barrier
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Ignition experiments
fire barrier
cushion
wastepaper basket
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Ignition experiments:overcoming the fire barrier
fire barrier
wastepaper basket
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Contents
• Ignition experiments (pre full scale)
• Tests for use as fire model input
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Tests for use as fire model input:What do fire models need?
“Fire models require some sort of an input withrespect to ‘what’ and ‘how’ a object burns!”
Common approaches how this is done are: • steady state heat release rate
• “t2 fire” (HRR curve follows a time dependant parabolic growth curve)
• Heat release rates from fire experiments• Fire spread by means of material ignition as a function of critical
heat flux for ignition• Fire growth purely based on the thermophysical properties of
the materials involved
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Tests for use as fire model input:Test description
Small samples - cone calorimeter• Heat release rate [kW/m2]• Critical heat flux
by exposing the samples to different heat fluxes in the cone calorimeter starting with a low heat flux and increasing it until piloted ignition occurred.
Larger items - laboratory hood equipped with an calorimeter equipment
• Heat release rate [kW]
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Tests for use as fire model input:Particleboard (wood) in Dalmarnock
Particleboard (wood)
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Tests for use as fire model input:Particleboard (wood) Critical heat flux and time to ignition
180281
250223
3252010
-19.511
-199
-18.58
-187
-176
-162
-124
-105
[s][kW/m2][#]
Time to ignitionHeat FluxSample
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Tests for use as fire model input:Particleboard (wood) HRR curves
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Tests for use as fire model input:Particleboard (wood) HRR curve comparison
cHmQ Δ⋅⋅= χ&&
heat release rate [kW/m2]mass loss rate [kg/s]efficiency factor [-]heat of combustion [MJ/kg]
Q&m&χ
cHΔ
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Tests for use as fire model input:Plastic Samples (Keyboard) in Dalmarnock
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Tests for use as fire model input:Plastic Samples (Keyboard) Critical heat flux and time to ignition
33018.66
27416.78
48114.357
-14.12
-13.71
-134
[s][kW/m2][#]
Time to ignitionHeat FluxSample
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Tests for use as fire model input:Plastic Samples (Keyboard) HRR curves
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Tests for use as fire model input:Plastic Samples (Keyboard) HRR curve comparison
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Tests for use as fire model input:Sofa in Dalmarnock
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Tests for use as fire model input:Sofa
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Tests for use as fire model input:Sofa HRR curve
α=5.92E-07 kW/s2
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Tests for use as fire model input:Sofa limited range of possibilities for the HRR curve
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Tests for use as fire model input:Sofa HRR curve comparison
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Tests for use as fire model input:Bookshelf in Dalmarnock
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Tests for use as fire model input:Bookshelf HRR curve
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Tests for use as fire model input:Bookshelf HRR curve
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Summary
• HRR per unit area (small samples)
• HRR (lager items)
• Critical heat fluxes
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