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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

NGCal_6m_3MW_16kgs

Table 1. Test Information
Name
NGCal_6m_3MW_16kgs
Date
Description

Calorimetry confirmation experiment using 1.5 m natural gas tube burner
Specimen
tube gas burner
Ignition
electric spark
Project ID (s)
Natural Gas Confirmation Burner Transient Combustion Calorimetry (TCC)
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
3,159
100
kW
Time to Peak Heat Release Rate
12.83
0.17
min
Total Heat Released, THR
1,932
62
MJ
Natural Gas Burner Total Heat Released, NGTHR
1,942
28
MJ
Heat Release Quality Confirmation, HRQC
1.009
0.036
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
38.6
1.3
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
3.70
0.17
kg/kg
CO2 Yield = CO2 Generated / TFM
2.86
0.14
kg/kg
CO Yield = CO Generated / TFM
below detection limit
0.00033
kg/kg
Soot Yield = Soot Generated / TFM
 Not measured -
kg/kg
Baseline Hood Exhaust Flow
16.75
0.50
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
22.13
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.
Table 4. Summary of Observed Test Events
Event Time (min) Description Video Snapshot Image
1
0.00
Ignition
Ignition
peak
12.83
Peak HRR
Peak HRR
2
22.13
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_8.3.4
Last Updated May 23, 2021