(4)
The specimen is placed in the hold chamber with the radiation doors closed. The airtight outer door must be secured, and the recording devices must be started. The specimen must be retained in the hold chamber for 60 seconds, plus or minus 10 seconds, before injection. The thermopile ”zero” value must be determined during the last 20 seconds of the hold period
(5)
When the specimen is to be injected, the radiation doors are opened, the specimen is injected into the environmental chamber, and the radiation doors are closed behind the specimen.
(6)
[[Reserved.]]
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Elodie Roux. Septembre 2003
Appendix F
(7)
[Injection of the specimen and closure of the inner door marks time zero. A record of thethermopile output with atleast onedatapointper second must be made during the time the specimen is in the environmental chamber.]
(8)
The test duration is .ve minutes.
(9)
A minimum of three specimens must be tested.
(f) Calculations.
(1) The calibration factor is calculated as follows :
F1 .F0 (210.8.22)kcal 273 P .Pv moleCH4STP WATTmin kw
Kh =
V1 .V0 mole Ta 760 22.41 0.01433kcal 1000w
F0 : .ow of methane at baseline (1pm)
F1 : higher preset .ow of methane (1pm)
V0 : thermopile voltage at baseline (mv)
V1 : Thermopile voltage at higher .ow (mv)
Ta : Ambient temperature (K)
P : Ambient pressure (mm Hg)
Pv : Water vapor pressure (mm Hg)
(2) [Heatrelease rates maybe calculatedfrom the reading ofthe thermopile output voltage at any instant of time as :
Vm KhHRR =
0.02323m2
HRR : Heat release Rate kw/m2 Vm : measured thermopile voltage (mv) Kh : Calibration Factor (Kw/mv)]
(3) The integral of the heat release rate is the total heat release as a function of time andiscalculatedby multiplying the rateby thedatasamplingfrequency in minutes and summing the time from zero to two minutes.
(g)
Criteria. The total positive heat release over the .rst two minutes of exposure for each of the three or more samples tested must be averaged, and the peak heat release rate for each of the samples must be averaged, and the peak heat release rate for each of the samples tested must be averaged, and the peak heat release ratefor each of the samplesmustbe averaged.The averagetotalheat releasemust not exceed65kilowatt-minutesper square meter, and the averagepeakheat release rate must not exceed75kilowattsper square meter.
(h)
Report. The test report must include the following for each specimen tested :
(1)
Description of the specimen.
(2)
Radiant heat .ux to the specimen, expressed in W/cm2 .
(3)
Datagiving release rates of heat(in kW/m2)as afunction of time, eithergra-phically ortabulated atintervals nogreaterthan10 seconds.The calibration factor(kn)must be recorded.
(4)
If melting, sagging, delaminating, or other behavior that a.ects the exposed surface area or the mode of burning occurs, these behaviors must be reported, together with the time at which such behaviors were observed.
(5)
The peak heat release and the 2-minute integrated heat release rate must be
reported. Amdt. 25-66, E.. 9/26/88 ′
Elodie Roux. Septembre 2003
Appendix F
Reflector, adjust slope.. top and bottom, for uniform. heat flux on sample. 9 Gauge
1/4" - 20 Machine Screw. 75 lg
(Unless denoted otherwise all dimensions are in milimeters.).
[Figure : "Globar" Radiant Panel]
(b) [”Globar”Radiant Panel]
754 Recueil des articles de la FAR -http://www.elodieroux.com
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Elodie Roux. Septembre 2003
Appendix F
FAR 25.F5 : [Appendix F–Part V–Test Method to Determine the Smoke Emission Characteristics of Cabin Materials]
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