1、Licensed by Information Handling ServicesFED-STD-372 72 m 9797977 0004Z35 b m Fed. Test Method Std. KO. 372 4.4 $lack Bol Temperature is the temperature of a perfect radiator-a surface with an emissivity of unity and, therefore, a refectivity of zero. 4.5 Corrido-r is defined.as an enclosed space co
2、nnecting a room or compartment with an exit; the corridor may include normal extensions, such as lobbies or other enlarged spaces. 5. PLIK)RIK:G RADIANT PANEL TEST CHAMBER - CONSTRUCTION AND INSTRUMENTATION 5,l nie flooring radiant panel test chamber employed for this test shall be located in a draf
3、t pro- tected laboratory. cnds, rind top shall be of 1.3 cm (1/2 in) calcium silicate board, such as Marinite XL, 0.58 g/cm Ibs/ft) nominal density with a thermal conductivity at 93OC (200F) of 0.96 cal (gm)/hr cm2 deg C per cm O. 77 Beu/(hr) (ft2) (dog P per in) One side shall be provided with an a
4、pproximately 10 cm x 110 cm (4 in x 44 in) draft-tight fire-resistant glass window so that the entire length of the test specimen may be observed from outside the fire test chamber. On the same side and below the observation window is a door which when open allww the specimen platform to be moved ou
5、t for mounting or removal of test specimens. A draft-eight fire-rssietant observation window may be installed at the low flux end of the chamber. 5.E.2 ilie bottom of the test chamber shall consist of a sliding steel platform which has provisions far rigidly securing the test specimen holder in a fi
6、xed and level position. Tkt? free, or air QCCQSS, area round the platform shall be in the range of 1950-3550 cm2 (300-500 square inehCa) 5.1.3 The top of the chamber shall have an exhaust stack with interior dimensiais of 12.5 cm (5 in) wide by 38 CLI (19 in) deep by 30 cm (12 in) high at the opposi
7、te end of the chamber from the radiant panel as oliown in Figures 3 and 4. 5.2 9316 radiant heat energy source shall be a panel of porous refractory material mounted in a cast iron fraue, with a radiation surface of 30.5 x 45.7 cm (12 by 18 in). It shall be capable of operating at temperatures up to
8、 816OC (1500F). and air at approximately atmospheric pressure, a clean dry air supply capable of providing 28.3 NTP (Koma1 Temperature Pressure) m3 per hr (1000 Standard Cubic Feet per Hour) at 7.6 cm (3.0 in) of water, and suitable inetrumentntion for monitoring and controlling the flow of fuel to
9、the panel. plana. of tho radiating surface of the panel is 8.9 cm (3-1/2 in). 14 cm (5-1/2 in), (see Figure 3). ello required flux profile. viewing a circular area 25.4 cm (10 in) in diameter at a range of about 1.37 m (54 in). ibrated over the black body temperature range of 490-51OoC (914-95OoP) i
10、n accordance with the procedure described in Appendix A. 5.2.3 Ahigh impedance potentiometer voltmeter with a suitable millivolt range shall be used to maitor the output of the radiation pyrometer described in 5.2.2. 5.3 The specimen holder (see Figure 5) is constructed from heat resistant stainless
11、 steel“ having overall dimeneiona of Il5 cm (45 in) by 32 cm (12-3/4 in) with a specimen opening of 20 cm (7.9 in) x 100 en (ri0 in). Six slots arc CUE in the flange on either side of the holder to reduce warping. ia fastened to the platform with two stud bolts at each end. 2/ 5.4 lie pilot: burner
12、used to ignite the specimen is a commercial propane venturi torch- with an axially oyrmetric burner tip having a propane supply tube with an orifice diameter of 0.0076 cm (0.003 in). lilie pilot: burner is positioned so that the flame generated will impinge on the center line of the specincn at: the
13、 O distance burned point at right anglee to the specimen length (see Figures 3 and 4). Tiic burner ehall be capable of being swung out of the ignition position so that the flame is horizontal and at. least 5 cm (2 in) above the specimen plane. - 1/ AII Type 300 (WA-1108330) or equivalent, thickness
14、o. 198 cm (0.078 in). - 2/ BEEWZ-O-HATIC TX 101. or equivalent. 5.1.1 The flooring radiant panel test chamber, shall be as shown in Figure6 3 and 4. The sips, (36 The panel fuel system shall consist of an aepirator for mixing gas 5.2.1 The radiant heat energy panel is mounted in the chamber at 30 to
15、 the horizontal specimen The horizontal distance from the O position on the specimen holder to the bottom edge (projected) The panel to specimen vertical distance is The angle and dimensions given above are critical in order to obtain 5.2.2 The radiation pyrometer or standardizing the thermal output
16、 of the panel shall be suitable for It shall be cal- The holder Licensed by Information Handling ServicesFED-STD-372 72 7777777 000q23b 8 Fed. Test Method Std. No. 372 c- - - - - - - - - - - _ _- - - - - - - u - are located in the Flooring-xadiant Panel Test Chamber (see Figures 3 and 4). is located
17、 in the longitudinal central vertical plane of the chamber 2.5 cm (i in) down from the top and 10 cm (4 in) back from the inside of the exhaust stack. located 15.2 cm (6 in) from the top of the stack. The chamber thermocouple The exhaust stack thermocouple is centrally 5.5.1 An indicating potentiome
18、ter with a range of 100-5OO0C (212-932F) may be used to determine the chamber temperatures prior to a test. 5.6 An exhaust duct with a capacity of 28.3 - 85 NTP m3 per minute (1000-3000 SCFM) decoupled from the chamber stack by at least 7.6 cm (3 in) on all sides and with an effective area of the ca
19、nopy slightly larger than the plane area of the chamber with the specimen platform in the out position is used to remove combustion products from the chamber. (With the panel turned on and the dunmy specimen in place, there should be no difference in air flow through the chamber stack with the exhau
20、st on or off, when measured with a suitable air velocity meter.) 5.7 The dummy specimen which is used in the flux profile determination shall be made of 1.9 cm (314 in) in0rganic0.58 g/cm3 (36 1bs/ft3) nominal density calcium silicate board, such as Marinite XL (see Figure 5). on and along the cente
21、rline at the 10, 20, 30, ., 90 cm locations, measured from the maximum flux end of the specimen. with the dummy specimen should be of the Schmidt-Boelter4/ type, have a range of 0-1.5 watts/cm2 Btu/ft2 sec), and shall be calibrated over the operating flux level range of 0.10 to 1.5 watts/cmb in acco
22、rdance with the procedure outlined in Appendix A. for this instrument. It is 25 cm (10 in) wide by 107 cm (42 in) long with 2.7 cm (1-1116 in) diameter holes centered 5.7.1 The total heat flux transducer used to determine the flux profile of the chamber in conjunction O 1.32 A source of 15-25OC cool
23、ing water shall be provided shall be used to measure the output of the total heat flux transducer during the fluu profile determina- tion. 6. SAFETY PRECAUTIONS 6.1 The possibility of a gas-air fuel explosion in the test chamber should be recognized. i) a gas feed cut off activated when the air supp
24、ly Suitable safeguards consistent with sound engineering practice should be installed in the panel.fue1 supply system. These may include one or more of the follawing: fails, 2) a fire sensor directed at the panel surface that stops fuel flow when the panel flame goes out, 3) a commercial gas water h
25、eater or gas fired furnace pilot burner control thermostatic shut off which is activated when the gas supply fails or other suitable and approved device. Manual reset is a requirement of any safeguard system used. 6.2 In view of the potential hazard from products of combustion, the exhaust-system mu
26、st be so designed and operated thet the laboratory environment is protected from smoke and gas. instructed to minimize his exposure to combustion products by follaaing sound safety practice, e.g., insure exhaust svstem is working properly, wear appropriate clothing including gloves, et al. The opera
27、tor should be 7.1 The test specimen shall be a floor covering system sized to provide for adequate clamping in the Its minimum dimensions shall exceed the frame width ZO cm (7.9 in) nominal and length The description of mounting procedures mounting frame. lo0 cm (39.4 in) nominal by about 5 cm (2 in
28、). specimen to accommodate the mounting frame bolts (see Figure 5). is given in Appendix B. It may be necessary to notch or punch holes in the 7.2 A minimum of three.specimens per sample shall be tested. - 31 - 41 Thermocouples should be kept clean to insure accuracy of readout. Medtherm 64-2-20 wil
29、l meet this requirement. Licensed by Information Handling ServicesFed, Tost Hethod Ctd. No. 372 8. phDIANT HEAT ENERGY FLUX PROFILE STANDARDIZATION 8.1 In a continuing program of tests, the flux profile shall be determined not less than once a week. Mere the the interval between tests is greater tha
30、n one week, the flux profile shall be determined at the atart of tlie teat series. 8.2 l.!ount: the dumy specimen in the mounting frame and attach the assembly to the sliding platform. 8.3 Wth the sliding platform out of the chamber, ignite the radiant panel. Allow the unit to heat for Adjust the fu
31、el mixture to give an air-rich one hour. Plane. pyroneter, of about 500G (932F), and the chamber temperature to about 180C (356F). ha been establielied, move the specimen platform into the chamber. nie pilot burner ia off during this determination. Hake fuel flud settings to bring the panel to a bla
32、ck body temperature as measured by the radiation When equilibrium 8.4 Allow 0.5 hours for the clixed chamber to equilibrate. 8.5 1,leasure the radiant heat energy flux level at the 20 cm, 40 cm, and 60 cm points with the total flux maer instrumentation. This is done by inserting the flux meter in th
33、e opening so that its detecting plano Is 0.16-0,32 cm (1/16-1/8 in) above and parallel to the plane of the dummy specimen and reading its output after 302 10 seconds. If the level is within the limits specified in 8.6 the flux profile deter- ninaeien ia atarted. profila data log format is shown in F
34、igure 7. If it is not, nike the necessary adjustments in panel fuel flow. A suggested flux 8.6 Tlio teat sliall be run under chanber operating conditions which give a flux profile as shown in Figure G. (8.77 and 0.83 Btu/ft sec) at the 20 cm point, between 0.28 and 0.52 watts/crn2 (0.42 and 0.46 Btu
35、/ft2 sec) ut: tho 40 cm point and between 0.22 and 0.26 watts/cm point. 8.7 fnocrt tlia flux meter in the 10 em opening following the procedure given in 8.5 above. Read the Q.V, oucput at 302 10 seconds. The 30 - 90 em flux levela are determined in the sane manner. Following the 90 cm measurement, m
36、ade a check reading at 40 CR. If this is within the Units set forth in 8.6 the test chamber is in calibration and the profile determination is completed. If not, carefully adjust fuel flow, allow 0.5 hours for equilibrium and repeat the procedure. tangular coordinate graph paper. curve will hereafte
37、r be referred to u6 the flux profile curve. The radian5 heat energy incident on the dummy specimen shall be between 0.87 and 0.95 watts/cm (O. 19 and 0.23 Btu/ft2 sec) at the 60 cm Proceed to the 20 cm point and repeat the 10 cm procedure. 8.8 Plot tho radiant: lient energy flux data as a function o
38、f distance along the specimen plane on rec- Carefully draw the best smooth curve through the data points. This 8.9 Dstcrnine tlie open chamber black body and chamber temperatures that are identified with the standard flux profile by opening the door and moving the specimen platform out. chrizber ta
39、equilibrate. This ia the temperature setting that can be used in subsequent test work in lieu of measuring the radiant flux at 20 em, (i0 cm, and 60 cm using the dumy specimen, abed ofaiii after 0.5 hours and is an added check on operating conditions. Allow 0.5 hours for the Read the radiation pyrom
40、eter output and record the black body temperature in C. The chamber temperature also should be deter- 9 I COXDITIONING* 9.1 Test specimens (including underlayment) are to be conditioned to equilibrium or a minimum of 48 hours, which over is greater, at 21 2 3OG (69.8 4 5.40F) and a relative humidity
41、 of 50 5 5 percent immedi- ately prior to testing. 10. TEST PROCEDURE 10.1 IJiith the sliding platforn out of the chamber, ignite the radiant panel. Allow the unit to heat Eor one iieurL1. are in agreement to vith.in 2 5OC with those determined in accordance with 8.9 above, the chamber is ready fer
42、use. Rend the panel black body temperature and the chamber temperature. If these teuperatures 10.2 Invert: the sample holder on n workbench and insert the flooring system. Place the steel bar clamps across the back of the assonbly und tighten nuts firnly. position, clean tlie test surface with u. va
43、cum and mount on the specimen platform. - i/ t io recooinended that u sheet of inorganic nillboard be used to cover the opening when the hinged Return the sample holder to its upright portion of the front pancl is open and the specimen platform is moved out of the chamber. board ia used to prevvcnt
44、heating of the specimen and to protect the operator. The mill- Licensed by Information Handling Services FED-STD-372 72 9 7777777 OOOq238 L 9 Licensed by Information Handling ServicesFGSTD-372 72 W 7949777 OOOLi239 3 9 Fed. Tcot tfetliod Ctd. ETO. 372 APPENDIX A Procedure for Calibration of Eidiatio
45、n Instrumentation Al Padiation Pyrometer furnace and naincaincd at uniforn temperatures successively of 490, 500, and 510OC (914, 932, 950OF). block body cnclooure may consist o a closed chrome1 metal cylinder with a snall sight hole in one end. Sight tho radiation pyroaatcr upon the opposite end of
46、 the cylinder where a thermocouple indicates the block body temperature. block body. output OE tlie radiation pyronoter. A2 Toea1 liant Flux Kcter $te calibration sliall be developed by truiiser calibration nethods with an KBS calibrated flux meter. Iliis lotter calibration shall nake use of the flo
47、oring radiant panel tester as the heat source. shall be made at: (?acli of the nino dumy specimen positions and the mean value of these results shall con- stitute the inal calibration. A1.1 Calibrate the radiation pyrometer by means of a conventional black body enclosure placed within a The Plucc th
48、e tlicrnocouple within a drilled hole and in good thermal contact with the Wien the black body enclosure has reached the appropriate temperature equilibrium, read the Repeat for each tenperature. A2.1 nia total flux meter ohrill be calibrated by the National Bureau of Standardsa, or alternatively, M
49、easurements 82.2 16 io resomimended that each laboratory maintain a dedicated calibrated reference flux meter against which one OE moro working flux neters can be compared as needed. flux cccer, clic working flux netcre should bc calibrated according to the procedure of A2.1 at least once per year. &ireet: requests for sucii calibration services to : In the absence of a reference Optical Radiation Section, 232.04 Hritional Bureau of Standards Washington, D. C. 20234 Licensed by Information Handling ServicesFed, Test Method Std. No. 372 APPENDIX B Mounting
