unstructuredio/SCORE-Bench · Datasets at Hugging Face

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NIST TN 2327r1
May 2025
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2. Experimental Apparatus and Procedure
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The experiments investigated 6 large (approximately 3 m to 6 m tall) Douglas-fir trees in the open under quasi-quiescent conditions (without an applied wind field). The experiments were conducted under the 20 MW exhaust hood calorimeter at NIST’s National Fire Research Laboratory (NFRL). A schematic of the hood and laboratory space is shown in Fig. 1. The subsections below elaborate further on the hood and describe the setup, instrumentation, and details of the
experimental series.


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Strong Wall
Air Intake Vents
XN = 2.3 m
20 MV Hood
XW = 14.7 m
Strong Floor
XS = 4.8 m
1750 m² High Bay, R125
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Figure 1. Floor plan of the National Fire Research Laboratory’s Room 125, housing the 20 MW exhaust hood.
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2.1 Experimental Setup
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The 6 large trees were burned one at a time under a 20 MW capacity calorimeter with a 13.8 m × 15.4 m canopy hood. The 20 MW exhaust hood captured the fire effluent for quantification of the heat release as a function of time. A large round exhaust duct (2.4 m diameter) was located 15.3 m above the floor.


Figure 2 shows a plan view of the experimental setup under the 13.8 m × 15.4 m canopy hood. The instrumentation and attachment I-beam columns are shown in their relative positions. The test specimen was placed directly below the center of the exhaust duct. The exhaust flow used during the experiments was approximately 70 kg/s and is listed in the FCD. Side skirts located 6.1 m above the floor were suspended from and surrounded the exhaust hood. Multiple heat flux gauges and plate thermometers were arranged vertically at designated locations as described in detail in Section 2.3.4.


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NIST TN 2327r1
May 2025
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The trees were ignited using a hexagonal-shaped, natural gas burner at the base of the tree (see Section 2.5.1). The trees were allowed to burn until flames and smoldering self-extinguished.


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N
Strong Wall
NW Column I
3 m Radius
West Column I
+
I East Column
13.8 m
2 m Radius
15.4m
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Tree
+ Hood/Tree Center
Hood Structure Outline
Strong Floor Attachment Points
I Vertical I-beam
Cooled Heat Flux Gauge
Plate Thermometer/Gas Thermocouple
Video Camera
Still Camera
Light
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Figure 2. A scale plan view drawing of the area under the 13.8 m × 15.4 m canopy hood showing instrumentation locations.
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2.2 Specimens
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Table 1 lists the details of each tree used in this study, including dimensions, mass, and moisture content (MC). Three pairs of trees were selected for study based on their height, which was roughly 4 m (Trees 1 and 2), 4.5 m (Trees 3 and 4), and 6 m (Trees 5 and 6). Although there was

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11

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NIST TN 2327r1

May 2025

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2. Experimental Apparatus and Procedure

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The experiments investigated 6 large (approximately 3 m to 6 m tall) Douglas-fir trees in the open under quasi-quiescent conditions (without an applied wind field). The experiments were conducted under the 20 MW exhaust hood calorimeter at NIST’s National Fire Research Laboratory (NFRL). A schematic of the hood and laboratory space is shown in Fig. 1. The subsections below elaborate further on the hood and describe the setup, instrumentation, and details of the

experimental series.

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Strong Wall

Air Intake Vents

XN = 2.3 m

20 MV Hood

XW = 14.7 m

Strong Floor

XS = 4.8 m

1750 m² High Bay, R125

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Figure 1. Floor plan of the National Fire Research Laboratory’s Room 125, housing the 20 MW exhaust hood.

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2.1 Experimental Setup

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The 6 large trees were burned one at a time under a 20 MW capacity calorimeter with a 13.8 m × 15.4 m canopy hood. The 20 MW exhaust hood captured the fire effluent for quantification of the heat release as a function of time. A large round exhaust duct (2.4 m diameter) was located 15.3 m above the floor.

Figure 2 shows a plan view of the experimental setup under the 13.8 m × 15.4 m canopy hood. The instrumentation and attachment I-beam columns are shown in their relative positions. The test specimen was placed directly below the center of the exhaust duct. The exhaust flow used during the experiments was approximately 70 kg/s and is listed in the FCD. Side skirts located 6.1 m above the floor were suspended from and surrounded the exhaust hood. Multiple heat flux gauges and plate thermometers were arranged vertically at designated locations as described in detail in Section 2.3.4.

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5

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NIST TN 2327r1

May 2025

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The trees were ignited using a hexagonal-shaped, natural gas burner at the base of the tree (see Section 2.5.1). The trees were allowed to burn until flames and smoldering self-extinguished.

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N

Strong Wall

NW Column I

3 m Radius

West Column I

+

I East Column

13.8 m

2 m Radius

15.4m

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Tree

+ Hood/Tree Center

Hood Structure Outline

Strong Floor Attachment Points

I Vertical I-beam

Cooled Heat Flux Gauge

Plate Thermometer/Gas Thermocouple

Video Camera

Still Camera

Light

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Figure 2. A scale plan view drawing of the area under the 13.8 m × 15.4 m canopy hood showing instrumentation locations.

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2.2 Specimens

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Table 1 lists the details of each tree used in this study, including dimensions, mass, and moisture content (MC). Three pairs of trees were selected for study based on their height, which was roughly 4 m (Trees 1 and 2), 4.5 m (Trees 3 and 4), and 6 m (Trees 5 and 6). Although there was