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Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

CLT_Room_Test_1-4

Table 1. Test Information
Name
CLT_Room_Test_1-4
Date
Description

Furnished room with 3 layers of type X gypsum on all walls. Ceiling is exposed CLT. Narrow door opening
Specimen
furnished studio apartment, CLT ceiling
Ignition
natural gas burner
Project ID (s)
Cross Laminated Timber Compartments
Test Director
Hoehler

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
13,114
786
kW
Time to Peak Heat Release Rate
12.03
0.17
min
Total Heat Released, THR
35,941
2,218
MJ
Natural Gas Burner Total Heat Released, NGTHR
36.49
0.53
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
1,806
212
kg
Net Effective Heat of Combustion = THR / NM
 Not measured -
MJ/kg
O2 Yield = O2 Consumed / TFM
1.54
0.19
kg/kg
CO2 Yield = CO2 Generated / TFM
2.01
0.25
kg/kg
CO Yield = CO Generated / TFM
0.0352
0.0043
kg/kg
Soot Yield = Soot Generated / TFM
 Not measured -
kg/kg
Baseline Hood Exhaust Flow
97.6
2.9
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
175.73
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, Plastic
 - -
Hood Size
15
 -
m
Effective Duct Diameter
2.424
0.005
m
Exhaust Flow Correction Factor
1.000
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
13.10
0.66
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
19.90
2.00
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
11.55
flashover
flashover
peak
12.03
Peak HRR
Peak HRR
3
113.80
flames extinguished on upper rear corner of wall 1
flames extinguished on upper rear corner of wall 1
4
152.55
flare up flames out doorway
flare up flames out doorway
5
158.78
start fire hose water suppression
start fire hose water suppression
6
175.73
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