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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Test055_CanvasTarp12x12_R3

Table 1. Test Information
Name
Test055_CanvasTarp12x12_R3
Date
Description

Duck Canvas Tarp,folded to 18 in x 18 in in center of pan. Ignition=wick soaked w/ 5 mL heptane
Specimen
canvas tarp
Ignition
heptane wick
Project ID (s)
Transient Combustion Calorimetry (TCC)
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
12.80
0.85
kW
Time to Peak Heat Release Rate
13.80
0.17
min
Total Heat Released, THR
19.2
1.8
MJ
Gas Burner Total Heat Released, NGTHR
-1
 -
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
1.760
0.028
kg
Net Effective Heat of Combustion = THR / NM
10.9
1.0
MJ/kg
O2 Yield = O2 Consumed / NM
0.870
0.031
kg/kg
CO2 Yield = CO2 Generated / NM
1.098
0.043
kg/kg
CO Yield = CO Generated / NM
0.0897
0.0035
kg/kg
Soot Yield = Soot Generated / NM
below detection limit
0.0058
kg/kg
Baseline Hood Exhaust Flow
3.078
0.092
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
60.25
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Cellulose
 - -
Hood Size
3
 -
m
Effective Duct Diameter
0.485
0.005
m
Exhaust Flow Correction Factor
1.033
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
13.61
0.41
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
16.12
0.60
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
2.95
0.02
kg
Final Specimen Mass, Mf (gravimetric)
1.19
0.02
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
13.80
Peak HRR
Peak HRR
2
60.15
Suppression
Suppression
3
60.25
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_8.4.8
Last Updated April 6, 2023