U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Plant_29

Table 1. Test Information
Name
Plant_29
Date
Description

Bluestem; height = 75 cm; width = 11 cm (at base); mass = 103 g (wet basis); moisture content = 10 % (dry basis)
Specimen
Bluestem
Ignition
100 W dual tip propane wand for 5 sec
Project ID (s)
Global Burning Properties of Little Bluestem, Excelsior and Douglas Fir
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
77.1
4.5
kW
Time to Peak Heat Release Rate
0.47
0.07
min
Total Heat Released, THR
1.33
0.10
MJ
Gas Burner Total Heat Released, NGTHR
0
 -
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
0.0935
0.0053
kg
Net Effective Heat of Combustion = THR / NM
14.3
1.4
MJ/kg
O2 Yield = O2 Consumed / NM
1.113
0.072
kg/kg
CO2 Yield = CO2 Generated / NM
1.458
0.098
kg/kg
CO Yield = CO Generated / NM
0.0610
0.0041
kg/kg
Soot Yield = Soot Generated / NM
0.0042
0.0015
kg/kg
Baseline Hood Exhaust Flow
6.74
0.20
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
1.38
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Little bluestem
 - -
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
13.23
0.53
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
18.00
0.50
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
0.09
0.00
kg
Final Specimen Mass, Mf (gravimetric)
below detection limit
0.00
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
0.47
Peak HRR
Peak HRR
2
1.38
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_8.6.0
Last Updated April 22, 2025