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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Test57_OSB_R3

Table 1. Test Information
Name
Test57_OSB_R3
Date
Description

7/16" thick, 24" wide, 96"tall panels of OSB mounted to 1" thick Marinite Board. Ignite using propane burner at 65kW, burner continuously. Upper heat flux gauges shielded and exposed once panel is fully involved.
Specimen
7/16" thick, 24" wide, 96" tall panels of OSB
Ignition
propane burner
Project ID (s)
Vertical Upward Flamespread on Parallel Panels
Test Director
Leventon

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
526
28
kW
Time to Peak Heat Release Rate
3.20
0.17
min
Total Heat Released, THR
262
18
MJ
Gas Burner Total Heat Released, NGTHR
43.3
1.3
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
16.15
0.28
kg
Net Effective Heat of Combustion = THR / NM
16.2
1.1
MJ/kg
O2 Yield = O2 Consumed / NM
1.456
0.053
kg/kg
CO2 Yield = CO2 Generated / NM
1.604
0.064
kg/kg
CO Yield = CO Generated / NM
0.0296
0.0012
kg/kg
Soot Yield = Soot Generated / NM
0.00160
0.00061
kg/kg
Baseline Hood Exhaust Flow
18.69
0.56
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
22.27
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Oriented Strand Board (OSB)
 - -
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
0.52
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
30.00
0.90
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
23.39
0.20
kg
Final Specimen Mass, Mf (gravimetric)
7.24
0.20
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
2.83
unshield heat flux gauges
unshield heat flux gauges
peak
3.20
Peak HRR
Peak HRR
3
8.28
spray bottle cooling back side of panels
spray bottle cooling back side of panels
4
12.03
gas to burner OFF
gas to burner OFF
5
20.52
pulling off smoldering embers to quench for gravametric measurement
pulling off smoldering embers to quench for gravametric measurement
6
21.38
water suppression of smoldering ember piles
water suppression of smoldering ember piles
7
22.27
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_8.5.1
Last Updated November 8, 2023