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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

NGQC_6m_20kgs_3MW

Table 1. Test Information
Name
NGQC_6m_20kgs_3MW
Date
Description

Calorimetry confirmation experiment using 1.5 m natural gas tube burner
Specimen
tube gas burner
Ignition
electric spark
Project ID (s)
Multiple Item Transient Combustion Calorimetry Natural Gas Confirmation Burner
Test Director
Bryant

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
3,094
98
kW
Time to Peak Heat Release Rate
21.15
0.17
min
Total Heat Released, THR
2,372
77
MJ
Natural Gas Burner Total Heat Released, NGTHR
2,376
34
MJ
Heat Release Quality Confirmation, HRQC
0.994
0.035
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
47.4
1.6
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
3.64
0.17
kg/kg
CO2 Yield = CO2 Generated / TFM
2.84
0.14
kg/kg
CO Yield = CO Generated / TFM
below detection limit
0.00044
kg/kg
Soot Yield = Soot Generated / TFM
below detection limit
0.00010
kg/kg
Baseline Hood Exhaust Flow
20.99
0.63
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
25.95
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
1.028
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
12.54
0.04
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
50.00
0.60
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.
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Table 4. Summary of Observed Test Events
Event Time (min) Description Video Snapshot Image
1
0.00
Ignition
Ignition
Download
2
11.17
start video
start video
Download
peak
21.15
Peak HRR
Peak HRR
Download
3
25.95
Fire Out
Fire Out
Download

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.
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Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
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Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Download
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.
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Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
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Plot of Exhaust Duct Mass Flow Rate.
Plot of Exhaust Duct Mass Flow Rate.
Download

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(link is external)

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

Report Process Script Version
NFRL_Report_8.3.4
Last Updated May 23, 2021