Skip to main content
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.

Test1_1box_r1

Table 1. Test Information
Name
Test1_1box_r1
Date
Description

1 Cardboard box, with crinkle paper. ignite with 4 wicks soaked in 10 mL each, centered at base of each face. ignition mark as last wick is lit with torch

Specimen
cardboard boxes filled with paper
Ignition
acetone wicks
Project ID (s)
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
328
16
kW
Time to Peak Heat Release Rate
4.68
0.17
min
Total Heat Released, THR
116.3
7.5
MJ
Natural Gas Burner Total Heat Released, NGTHR
0
-
MJ
Heat Release Quality Confirmation, HRQC
Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
7.750
0.028
kg
Net Effective Heat of Combustion = THR / NM
15.00
0.97
MJ/kg
O2 Yield = O2 Consumed / NM
1.122
0.036
kg/kg
CO2 Yield = CO2 Generated / NM
1.505
0.054
kg/kg
CO Yield = CO Generated / NM
0.0350
0.0013
kg/kg
Soot Yield = Soot Generated / NM
0.00145
0.00025
kg/kg
Baseline Hood Exhaust Flow
20.95
0.63
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
22.42
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
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
13.61
0.41
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
16.12
0.60
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
8.00
0.02
kg
Final Specimen Mass, Mf (gravimetric)
0.25
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
4.68
Peak HRR
Peak HRR
2
15.55
rake fuel pile
rake fuel pile
3
22.42
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_8.3.3
Last Updated May 14, 2021