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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Test_44

Table 1. Test Information
Name
Test_44
Date
Description

100 kW Nat. gas burner. in rear of cabinet with cables & cable tray above cabinet (front). TC tree on top of rear of cabinet. cabinet vents closed. Issue with compressed air and sample pump.
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
325
18
kW
Time to Peak Heat Release Rate
19.40
0.07
min
Total Heat Released, THR
 Not measured -
MJ
Gas Burner Total Heat Released, NGTHR
327.9
4.7
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
 Not measured -
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
 Not measured -
kg/kg
CO2 Yield = CO2 Generated / TFM
 Not measured -
kg/kg
CO Yield = CO Generated / TFM
 Not measured -
kg/kg
Soot Yield = Soot Generated / TFM
 Not measured -
kg/kg
Baseline Hood Exhaust Flow
16.62
0.50
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
32.17
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
13.10
0.52
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
30.00
0.90
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
2
3.02
50 kW
50 kW
3
6.02
120 kW
120 kW
4
11.43
Sample Pump Failed
Sample Pump Failed
5
12.02
300 kw
300 kw
peak
19.40
Peak HRR
Peak HRR
6
20.07
200 kW
200 kW
7
26.02
100 kW
100 kW
8
32.17
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