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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

NGCal_3mHood_300kW_2kgs

Table 1. Test Information
Name
NGCal_3mHood_300kW_2kgs
Date
Description

Calorimetry confirmation experiment using 0.25 m natural gas box burner
Specimen
box gas burner
Ignition
propane wand
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
328
10
kW
Time to Peak Heat Release Rate
9.33
0.17
min
Total Heat Released, THR
186.9
6.1
MJ
Natural Gas Burner Total Heat Released, NGTHR
181.1
2.7
MJ
Heat Release Quality Confirmation, HRQC
0.960
0.034
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
3.74
0.13
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
3.69
0.17
kg/kg
CO2 Yield = CO2 Generated / TFM
2.85
0.14
kg/kg
CO Yield = CO Generated / TFM
below detection limit
0.00055
kg/kg
Soot Yield = Soot Generated / TFM
below detection limit
0.00020
kg/kg
Baseline Hood Exhaust Flow
2.018
0.061
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
23.00
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
3
 -
m
Effective Duct Diameter
0.485
0.004
m
Exhaust Flow Correction Factor
1.033
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
9.33
Peak HRR
Peak HRR
2
22.92
bleed pressure off gas line
bleed pressure off gas line
3
23.00
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