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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Control-Smoldering

Table 1. Test Information
Name
Control-Smoldering
Date
Description

Fire Barrier: None , Cover Fabric: Polypropylene (3kg), Filling Material: Polyethalene (6kg) and Polyester (4 kg) Ignition with smodering cigarette
Specimen
upholstered chair mockup
Ignition
18 kW propane square burner
Project ID (s)
Fire Barriers in Full-Scale Chair Mock-ups
Test Director
Zammarano

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
9.4
4.8
kW
Time to Peak Heat Release Rate
22.63
0.17
min
Total Heat Released, THR
below detection limit
6.4
MJ
Natural Gas Burner Total Heat Released, NGTHR
0
 -
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
below detection limit
0.32
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
-7
-51
kg/kg
CO2 Yield = CO2 Generated / TFM
-6
-39
kg/kg
CO Yield = CO Generated / TFM
below detection limit
2.5
kg/kg
Soot Yield = Soot Generated / TFM
 Not measured -
kg/kg
Baseline Hood Exhaust Flow
21.49
0.64
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
40.28
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Polyurethane Foam
 - -
Hood Size
6
 -
m
Effective Duct Diameter
1.975
0.005
m
Exhaust Flow Correction Factor
1.028
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
13.10
0.66
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
20.00
4.00
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
 Not measured -
kg
Final Specimen Mass, Mf (gravimetric)
 Not measured -
kg
Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
Figure 1. Plot of Heat Release Rate data with event markers and error bars shown at peak.
Table 4. Summary of Observed Test Events
Event Time (min) Description Video Snapshot Image
1
0.00
Ignition
Ignition
2
0.52
3 smoldering cigarttes placed in crevise
3 smoldering cigarttes placed in crevise
peak
22.63
Peak HRR
Peak HRR
3
40.28
Fire Out
Fire Out

Table 5. Supplemental Data Plots

Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Exhaust Duct Mass Flow Rate.
Plot of Exhaust Duct Mass Flow Rate.

Bryant, R. and Bundy, M. The NIST 20 MW Calorimetry Measurement System for Large-Fire Research, Technical Note (NIST TN) 2077, 2019
https://doi.org/10.6028/NIST.TN.2077

NIST Fire Calorimetry Database (FCD)
https://doi.org/10.18434/mds2-2314

Report Process Script Version
NFRL_Report_8.3.3
Last Updated May 14, 2021