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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Heptane_2

Table 1. Test Information
Name
Heptane_2
Date
Description

Heptane pool fire using 30 cm burner, 1.0 cm lip height, HFGauge_1 at R=0.83 m , two aspirated TCs, bottom aspirated near bidirectional probe middle; bi-directional probe; double screen in front of comaprtment closed, heat exchanger controlling pool burner cooling, HF2=2.34m (48 cm above rim); HF3=3.11 m (48 cm above rim); Liquid TCs at -2.0 cm, -3.0 cm, -4.0 cm at R=1; TCs at -0.25 cm, -3.0 at R=10 cm
Specimen
Round, Water-Cooled, 30 cm Liquid-Fuel Burner
Ignition
propane wand
Project ID (s)
Structure of Medium-Scale Pool Fires
Test Director
Hamins

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
123.3
6.3
kW
Time to Peak Heat Release Rate
65.23
0.17
min
Total Heat Released, THR
470
24
MJ
Gas Burner Total Heat Released, NGTHR
0
 -
MJ
Heat Release Quality Confirmation, HRQC
-255.803
 -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
 Not measured -
kg
Total Fuel Mass Burned, TFM = THR / HOCf
10.58
0.63
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
3.29
0.22
kg/kg
CO2 Yield = CO2 Generated / TFM
3.11
0.22
kg/kg
CO Yield = CO Generated / TFM
0.00877
0.00061
kg/kg
Soot Yield = Soot Generated / TFM
0.0165
0.0026
kg/kg
Baseline Hood Exhaust Flow
2.111
0.063
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
75.25
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Heptane
 - -
Hood Size
3
 -
m
Effective Duct Diameter
0.483
0.004
m
Exhaust Flow Correction Factor
1.033
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
12.68
0.50
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
44.40
1.30
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
29.45
adjusting flow from 2 kg/s to 1 kg/s
adjusting flow from 2 kg/s to 1 kg/s
peak
65.23
Peak HRR
Peak HRR
3
74.85
Suppression
Suppression
4
75.25
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_8.5.6
Last Updated November 19, 2024