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Test40_4Commodity_R2

Table 1. Test Information
Name
Test40_4Commodity_R2
Date
Description

2x2 array separated by 21", 16 wicks soaked in 10 mL each, placed at base of each face, ignition marked as wick is lit with torch.

Specimen
cardboard boxes filled with polystyrene cups
Ignition
acetone wick
Project ID (s)
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
2,071
125
kW
Time to Peak Heat Release Rate
3.95
0.17
min
Total Heat Released, THR
710
44
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
27.890
0.028
kg
Net Effective Heat of Combustion = THR / NM
25.5
1.6
MJ/kg
O2 Yield = O2 Consumed / NM
1.908
0.061
kg/kg
CO2 Yield = CO2 Generated / NM
2.136
0.077
kg/kg
CO Yield = CO Generated / NM
0.0635
0.0023
kg/kg
Soot Yield = Soot Generated / NM
0.099
0.013
kg/kg
Baseline Hood Exhaust Flow
20.45
0.61
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
26.37
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, Polystyrene
- -
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
25.00
2.50
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
28.00
0.02
kg
Final Specimen Mass, Mf (gravimetric)
0.11
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
3.95
Peak HRR
Peak HRR
2
23.55
stir embers
stir embers
3
26.37
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