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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Test13_woodCrib_r1

Table 1. Test Information
Name
Test13_woodCrib_r1
Date
Description

Wood crib 22"x22"x18"tall, 2 wicks soaked in 10 mL each, centered at opening at base. ignition marked as last wick is lit with torch
Specimen
wood cribs
Ignition
acetone wicks
Project ID (s)
Multiple Item Transient Combustion Calorimetry
Test Director
McGrattan

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
396
19
kW
Time to Peak Heat Release Rate
23.13
0.17
min
Total Heat Released, THR
597
31
MJ
Natural Gas Burner Total Heat Released, NGTHR
1
 -
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
36.540
0.028
kg
Net Effective Heat of Combustion = THR / NM
16.34
0.86
MJ/kg
O2 Yield = O2 Consumed / NM
1.206
0.039
kg/kg
CO2 Yield = CO2 Generated / NM
1.587
0.057
kg/kg
CO Yield = CO Generated / NM
0.02304
0.00083
kg/kg
Soot Yield = Soot Generated / NM
0.00195
0.00031
kg/kg
Baseline Hood Exhaust Flow
16.27
0.49
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
55.73
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Cellulose
 - -
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
13.61
0.41
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
16.12
0.60
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
39.39
0.02
kg
Final Specimen Mass, Mf (gravimetric)
2.85
0.02
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
peak
23.13
Peak HRR
Peak HRR
2
45.40
stir embers
stir embers
3
55.73
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