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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

NGQC_6m_12Kgs

Table 1. Test Information
Name
NGQC_6m_12Kgs
Date
Description

Confirmation burn using 30 cm box burner ourside of cabinet. Calibration from 50 kW to 600 kW. GC #1 running.
Specimen
Box Burner
Ignition
pilot flame
Project ID (s)
NRC Electrical Cabinet Experiments
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
618
32
kW
Time to Peak Heat Release Rate
28.87
0.07
min
Total Heat Released, THR
555
29
MJ
Gas Burner Total Heat Released, NGTHR
559.7
8.0
MJ
Heat Release Quality Confirmation, HRQC
0.985
0.054
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
11.09
0.68
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
3.64
0.25
kg/kg
CO2 Yield = CO2 Generated / TFM
2.82
0.20
kg/kg
CO Yield = CO Generated / TFM
below detection limit
0.00052
kg/kg
Soot Yield = Soot Generated / TFM
below detection limit
0.00089
kg/kg
Baseline Hood Exhaust Flow
12.11
0.36
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
31.20
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Natural Gas
 - -
Hood Size
6
 -
m
Effective Duct Diameter
1.975
0.005
m
Exhaust Flow Correction Factor
1.055
0.034
 -
Net Heat of Combustion (per unit mass O2), Ef
12.54
0.50
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
50.00
1.50
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
-0.32
pilot igniton
pilot igniton
2
0.00
Ignition
Ignition
peak
28.87
Peak HRR
Peak HRR
3
31.20
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_8.5.9
Last Updated January 17, 2025