ASTM C518-17 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.pdf
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1、Designation: C518 17Standard Test Method forSteady-State Thermal Transmission Properties by Means ofthe Heat Flow Meter Apparatus1This standard is issued under the fixed designation C518; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This test metho
3、d covers the measurement of steady statethermal transmission through flat slab specimens using a heatflow meter apparatus.1.2 The heat flow meter apparatus is used widely because itis relatively simple in concept, rapid, and applicable to a widerange of test specimens. The precision and bias of the
4、heat flowmeter apparatus can be excellent provided calibration is carriedout within the range of heat flows expected. This meanscalibration shall be carried out with similar types of materials,of similar thermal conductances, at similar thicknesses, meantemperatures, and temperature gradients, as ex
5、pected for thetest specimens.1.3 This a comparative, or secondary, method of measure-ment since specimens of known thermal transmission proper-ties shall be used to calibrate the apparatus. Properties of thecalibration specimens must be traceable to an absolute mea-surement method. The calibration s
6、pecimens should be ob-tained from a recognized national standards laboratory.1.4 The heat flow meter apparatus establishes steady stateone-dimensional heat flux through a test specimen between twoparallel plates at constant but different temperatures. Byappropriate calibration of the heat flux trans
7、ducer(s) withcalibration standards and by measurement of the plate tempera-tures and plate separation. Fouriers law of heat conduction isused to calculate thermal conductivity, and thermal resistivityor thermal resistance and thermal conductance.1.5 This test method shall be used in conjunction with
8、Practice C1045. Many advances have been made in thermaltechnology, both in measurement techniques and in improvedunderstanding of the principles of heat flow through materials.These advances have prompted revisions in the conceptualapproaches to the measurement of the thermal transmissionproperties
9、(1-4).2All users of this test method should be awareof these concepts.1.6 This test method is applicable to the measurement ofthermal transmission through a wide range of specimen prop-erties and environmental conditions. The method has been usedat ambient conditions of 10 to 40C with thicknesses up
10、 toapproximately 250 mm, and with plate temperatures from195C to 540C at 25-mm thickness (5, 6).1.7 This test method may be used to characterize materialproperties, which may or may not be representative of actualconditions of use. Other test methods, such as Test MethodsC236 or C976 should be used
11、if needed.1.8 To meet the requirements of this test method the thermalresistance of the test specimen shall be greater than 0.10m2K/W in the direction of the heat flow and edge heat lossesshall be controlled, using edge insulation, or a guard heater, orboth.1.9 It is not practical in a test method o
12、f this type to try toestablish details of construction and procedures to cover allcontingencies that might offer difficulties to a person withoutpertinent technical knowledge. Thus users of this test methodshall have sufficient knowledge to satisfactorily fulfill theirneeds. For example, knowledge o
13、f heat transfer principles, lowlevel electrical measurements, and general test procedures isrequired.1.10 The user of this method must be familiar with andunderstand the Annex. The Annex is critically important inaddressing equipment design and error analysis.1.11 Standardization of this test method
14、 is not intended torestrict in any way the future development of improved or newmethods or procedures by research workers.1.12 Since the design of a heat flow meter apparatus is nota simple matter, a procedure for proving the performance of anapparatus is given in Appendix X3.1This test method is un
15、der the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved May 1, 2017. Published July 2017. Originally approvedin 1963. Last previous edition approved in 2015 as C518 15. DOI: 10.1520/C0518-17
16、.2The boldface numbers in parentheses refer to the list of references at the end ofthis test method.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized
17、 principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.11.13 The values stated in SI units are to be regarded asstandard. No
18、other units of measurement are included in thisstandard.1.14 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to consult andestablish appropriate safety and health practices and deter-mine the a
19、pplicability of regulatory limitations prior to use.1.15 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued
20、 by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3C167 Test Methods for Thickness and Density of Blanket orBatt Thermal InsulationsC168 Terminology Relating to Thermal InsulationC177 Test Method for Steady-State Heat Flux Measure-m
21、ents and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC236 Test Method for Steady-State Thermal Performance ofBuilding Assemblies by Means of a Guarded Hot Box(Withdrawn 2001)4C687 Practice for Determination of Thermal Resistance ofLoose-Fill Building InsulationC976 Test
22、 Method for Thermal Performance of BuildingAssemblies by Means of a Calibrated Hot Box (With-drawn 2002)4C1045 Practice for Calculating Thermal Transmission Prop-erties Under Steady-State ConditionsC1046 Practice for In-Situ Measurement of Heat Flux andTemperature on Building Envelope ComponentsC105
23、8 Practice for Selecting Temperatures for Evaluatingand Reporting Thermal Properties of Thermal InsulationC1114 Test Method for Steady-State Thermal TransmissionProperties by Means of the Thin-Heater ApparatusE230/E230M Specification for Temperature-ElectromotiveForce (emf) Tables for Standardized T
24、hermocouplesE178 Practice for Dealing With Outlying ObservationsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 8301:1991 Thermal InsulationDetermination ofSteady-State Thermal Res
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