SAE J 2302-2011 Thermal Effectiveness of Sleeve Insulation (Stabilized Type)《衬套绝缘的热有效性》.pdf

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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there

2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication m

3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U

4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J2302_201102SURFACEVEHICLESTANDARDJ2302 FEB2011 Issued 1996-11 Stabilized 2011-02 Superseding J

5、2302 SEP2008 Thermal Effectiveness of Sleeve Insulation RATIONALE The technical report covers technology, products, or processes which are mature and not likely to change in the foreseeable future. STABILIZED NOTICE This document has been declared “Stabilized“ by the SAE Harness Covering Standards C

6、ommittee and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction o

7、r networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 2 of 10 1. ScopeThis procedure measures the resistance to radiant heat flow of insulating materials in sleeve form.The sleeves effectiveness (SE) is determined by measuring the difference in surface temperature of

8、a flatblack, single-diameter ceramic cylinder with and without the standard diameter sleeve at the specifiedtemperature, position, and distance from the radiant heat source.1.1 SafetyThis method may involve hazardous materials, operations, and equipment. This SAE Standard doesnot address the safety

9、problems associated with its use. It is the responsibility of the user of this document toconsult and establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.2 LimitationsThe temperature measurement range of this procedure is 121 C to

10、 482 C. Sleeve size islimited to 19 mm nominal ID and 30 cm 2 cm long. The test distance is the shortest measured span from thesurface of the radiant heat source to the surface of the ceramic cylinder. Unless otherwise specified, thestandard distance is 25 mm 2 mm with the cylinder position parallel

11、 to and directly above the heat source.This procedure is performed under static (passive) air flow with no vibration. Do not adapt the temperaturesequencing as a thermal cycle.1.3 This test method is based on SI units.1.4 Note to UsersUse the appropriate alphanumeric codes to specify temperature con

12、dition (Table 1),sequence (Table 2), smoke generation option (see 6.3.2) and sample position (see 6.3.3) when referencingthis document. For example, a line code of B(2)S(25)P(3)D(20) after the SAE document number means:Heating to a two-step sequence (B2), first at 121 C, then 260 C measuring smoke g

13、eneration (S) at a levelnot exceeding 25 s. The sample position (P) is at 3 oclock, 20 mm (D) from the heat source. Bracketnumbers in parentheses.2. References2.1 Applicable PublicationThe following publication forms a part of this specification to the extent specifiedherein.2.1.1 NIST PUBLICATIONAv

14、ailable from the National Institute of Standards and Technology, U.S. Department ofCommerce, Gaithersburg, MD 20899. (Formerly NBS)NIST (NBS) Circular 590Methods of Testing Thermocouples and Thermocouple MaterialsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo repr

15、oduction or networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 3 of 10 3. SummaryThis method describes the procedure and equipment for measuring the thermal effectiveness ofsleeves. The test also contains the option of monitoring smoke generation time at the conditio

16、ns specified. Abase line is established first by exposing a 16 mm OD, flat black ceramic cylinder to the specified radiant heatsource. Normally, the ceramic cylinder is parallel to and directly above the heat source at the specifieddistance. Other ceramic cylinder positions are possible. During the

17、test, both facing surface temperatures ofthe radiant heat source and cylinder are recorded. After establishing the base line surface temperature, theceramic cylinder is sleeved with the protective material and tested again. The surface temperatures of the heatsource, sleeve, and cylinder are recorde

18、d. In both test sequences, measuring the radiant source temperatureand sleeve surface temperatures ensures consistent and fair measure of the sleeves effectiveness. Asignificant variation in these values requires a repetition of the test sequence.4. Significance and Use4.1 Data obtained by this meth

19、od are applicable to the material under conditions of this test and are notnecessarily the same as those obtained in end use applications. The information permits comparison,selection, or qualification of commercially available sleeves where a level of proficiency is desired beyond shorttime quality

20、 control tests.4.2 The test set-up (see Figure 1) can be modified to reduce the effects of convective heat transfer by aligning thesleeve horizontal (3 oclock position) to the heat source. Indicate other positions and distances from the heatsource using item 6.3.3 protocol.FIGURE 1TEST SET-UP TOP VI

21、EW4.3 Test conditions and requirements using a line code must follow the order of temperature, sequence, smokegeneration (optional), position by the clock, and distance from the heat source. See 1.4. Bracket all numbersin parentheses.Copyright SAE International Provided by IHS under license with SAE

22、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 4 of 10 4.3.1 TEMPERATURE AND SEQUENCE PROTOCOLList single or multiple test temperatures using the appropriateTable 1 condition letter. Condition A cannot use the sequence number 2 or

23、 3 because it is the lowestspecified temperature. If a step sequence is desired with Condition A as the upper temperature, use the Zsuffix. Using a 2 or 3 test sequence after a B or C condition means the sequence follows the lowertemperatures in Table 1. Always use the Z suffix to indicate a departu

24、re from the Table 1 temperaturesequence. When using the Z suffix, indicate the preferred temperatures in degrees celsius in parentheses,separating the temperatures with a slash mark (/) - for example, Z2 (100 C/121 C).4.3.2 POSITION AND DISTANCE PROTOCOLThe letter P followed by the appropriate numbe

25、r in parenthesesindicates the circumferential clock position of the ceramic cylinder to the heat source. The radial distance Dfrom the surface of the heat source to the surface of the ceramic cylinder is specified in mm bracketed byparentheses. If no position or distance is specified, the standard c

26、onditions apply.5. Equipment15.1 Hot BoxFabricated from non-conductive, fire-resistant, thermal-insulation board material (see detail drawingFigures 2A and 2B), open at the top with nominal internal dimensions of 50 cm x 50 cm x 50 cm. Angle iron50 mm x 50 mm x 4 mm supports the box panels.FIGURE 2A

27、HOT BOX1. A complete parts list is available from SAE.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 5 of 10 FIGURE 2BHOT BOX SIDE VIEW WITH CONTROLLER5.2 Fume Hood

28、Per appropriate industry-approved construction and performance.5.3 Radiant Heat SourceUnit 320 mm long x 16 mm OD, capable of reaching 540 C. Black-coated stainlesssteel emitter sheath. The sheath is backed with 2.5 cm high-density thermal insulation. The thermal heateroutput is 1100 W, 240 V, 4.6 A

29、, with surface self-cleaning capability for most applications.25.4 Temperature Controller1/4 DIN, digital indicating controller with an accuracy of 3 C up to 540 C.Autotuning based microprocessor for primary output. Four to 20 mA output. Operating environment 0 C to65 C. Sensor input must accept typ

30、e K thermocouple.35.5 Temperature RecorderComputer-controlled data analyzer.4Optional manual data recorder with a digitalindicator. Ten-channel sensor input selector. Will accept type K thermocouple. Operating environment 0 Cto 55 C. Accuracy of 3 C up to 540 C.55.6 Type K ThermocoupleAmerican Natio

31、nal Standards Institute (ANSI) code K (yellow) with chromel/alumelbase metals. Choose solid bare wire diameter (gauge) at 0.5 mm (AWG 24). Insulation, glass braided overglass wrap or other that meets or exceeds 500 C capability.5.7 Ceramic CylinderA flat black (not painted) solid black ceramic mandr

32、el rod, 16 mm OD x 320 mm long,composition: 92% Al2O3, 8-10% SiO2and 0.5-1% Fe2O3.62. (Raymax 1330 radiant heater meets the requirements.)3. (Watlow Series 945-1FA1-A000 meets the requirements.)4. (Fluke Hydra Data Logger meets the requirements.)5. (Watlow #8D45-0080-0-600 meets the requirements.)6.

33、 (National Ceramic Co. meets the requirements.)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 6 of 10 5.8 Enclosure Panel BoxA unit, 51 cm x 41 cm x 20 cm, with a s

34、ubpanel 43 cm x 33 cm for mounting thetemperature controller, temperature indicator, circuit breaker, transformer, lights, and switches. See Figure2B.6. Test Requirements6.1 SpecimenThe test sleeve length must be 28 cm to 32 cm long with a 19 mm nominal ID. Measure thesleeve ID using a plug gauge. T

35、he sleeve may or may not incorporate a seam. Seamed sleeves are testedwith the seam at the top of the ceramic cylinder. The air space between the test sleeve around the ceramiccylinder (drape gap) will not be uniform. Try to be consistent in placement of repetitive test samples.6.2 Unless otherwise

36、specified, testing shall be conducted following a specimen conditioning period of 24 hminimum at 23 C 2 C and 50% R.H. 5% R.H.6.3 TemperaturesFor standardization purposes, select one or more of the following test temperature conditionsin Table 1:6.3.1 SEQUENCEFor standardization purposes, select one

37、 of the following test sequences in Table 2.6.3.2 Use the letter S after the temperature condition letter in Table 1 to designate smoke generation and time inseconds in parentheses. See item 4.3.1.6.3.3 POSITION AND DISTANCEIndicate the circumferential position of your ceramic cylinder relative to t

38、he heatsource (at the center) using the positions of the clock. The 12 oclock position is standard, with the cylinder25 mm directly over the heat source. Other positions (P) and distances (D) must be indicated on individualpart or component drawings per item 4.3.2.6.4 Do not use the sequence conditi

39、ons to specify a repetitive cycle test.6.5 The specimen must be free of any visible defects that would affect the test results.6.6 Test in a “passive” hood environment. Air flow must not influence test measurements.TABLE 1TEMPERATURE CONDITIONSCondition Temperature C Available Sequence NumbersA 121

40、1B 260 1,2C 482 1,2,3Z As specified within the limits of this document. As specified within the limits of this document.TABLE 2SEQUENCESequence Condition1 Dedicated test at specified isothermal temperature.2 Two-step sequence using specified temperatures.3 Three-step sequence using specified tempera

41、tures.9 As specified within the limits of this document.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2302 Stabilized FEB2011 Page 7 of 10 6.7 Thermocouple Mounting6.7.1 CERAMIC CYLINDERPositi

42、on the thermocouple touching the outside surface of the cylinder, at the midpointof the length (15 cm), and facing down at the lowest point toward the heat source. Cover (pot) thethermocouple junction using black aluminum oxide and ceramic base potting adhesive.7Follow the manufacturers requirements

43、 for handling and cure of the adhesive. Dont wrap or twist thethermocouple wires around the rod and risk breaking the integrity of the contact junction.6.7.2 TEST SLEEVEPosition the thermocouple at the mid-point (15 cm) and lowest point of the test sleeve facingthe radiant heat source. Sewn sleeves

44、should be positioned on the ceramic rod with the seam 180 degreesaway from the heat source. The junction point must be in direct contact with the surface of the material.Secure the thermocouple to the sleeve using a fine copper magnet wire wrap or fiberglass thermal tapecapable of surviving the test

45、 temperatures. Make sure the wire or tape doesnt touch the end of thethermocouple.6.7.3 HEAT SOURCEAs purchased the heat source thermocouple may not be in the proper position. Re-positionthe thermocouple at the mid-point (15 cm) of the heat source shown in Figure 1. Secure the thermocoupleby brazing

46、 or using black aluminum oxide and ceramic base potting adhesive.87. Calibration7.1 The instrument manufacturer or certified agent should calibrate all recorders to the appropriate NationalInstitute of Standards and Technology (NIST) document for accuracy claimed and the appropriate labeldisplayed o

47、n the instrument. Calibration by the test facility is appropriate if substantiated by data measured bycalibrated instruments traceable to NIST (formerly NBS).7.2 Calibrate thermocouples by the comparison method utilizing procedures based upon those described in NBSCircular 590, Methods of Testing Th

48、ermocouples and Thermocouple Materials. Pre-calibrated thermocouplesare available from the manufacturers.8. Procedure8.1 Establish the base line (no sleeve) measurements by placing the ceramic cylinder in the Hot Box. Position andsecure the thermocouples using the techniques described in 6.7. The ceramic rod is supported on clampsattached to a self-supporting lattice frame work using metal rods found in most lab equipment catalogs.Position the parts in the hot box according to Figures 3A and 3B. Unle