1、Designation:C104319Standard Practice forGuarded-Hot-Plate Design Using Circular Line-HeatSources1This standard is issued under the fixed designation C1043;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the design of a circular line-heat-source guarded hot plate for use in accordance with TestMethod C177.NOTE1Test Method
3、C177 describes the guarded-hot-plate apparatusand the application of such equipment for determining thermal transmis-sion properties of flat-slab specimens.In principle,the test methodincludes apparatus designed with guarded hot plates having eitherdistributed-or line-heat sources.1.2 The guarded ho
4、t plate with circular line-heat sources isa design in which the meter and guard plates are circular plateshaving a relatively small number of heaters,each embeddedalong a circular path at a fixed radius.In operation,the heatfrom each line-heat source flows radially into the plate and istransmitted a
5、xially through the test specimens.1.3 The meter and guard plates are fabricated from acontinuous piece of thermally conductive material.The platesare made sufficiently thick that,for typical specimen thermalconductances,the radial and axial temperature variations in theguarded hot plate are quite sm
6、all.By proper location of theline-heat source(s),the temperature at the edge of the meterplate is made equal to the mean temperature of the meter plate,thus facilitating temperature measurements and thermal guard-ing.1.4 The line-heat-source guarded hot plate has been usedsuccessfully over a mean te
7、mperature range from 10to+65C,with circular metal plates and a single line-heatsource in the meter plate.The chronological development ofthe design of circular line-heat-source guarded hot plates isgiven in Refs(1-9).2NOTE2Detailed drawings and descriptions for the construction of twoline-heat-sourc
8、e guarded-hot-plate apparatuses are available in the ad-junct.31.5 This practice does not preclude(1)lower or highertemperatures;(2)plate geometries other than circular;(3)line-heat-source geometries other than circular;(4)the use ofplates fabricated from ceramics,composites,or other materials;or(5)
9、the use of multiple line-heat sources in both the meterand guard plates.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It
10、 is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on st
11、andard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:4C168 Terminology Relating to Thermal Insulation
12、C177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC1044 Practice for Using a Guarded-Hot-Plate Apparatus orThin-Heater Apparatus in the Single-Sided ModeE230 Specification for Temperature-Electromotive Force(emf)Ta
13、bles for Standardized Thermocouples2.2 ASTM Adjuncts:Line-Heat-Source Guarded-Hot-Plate Apparatus33.Terminology3.1 DefinitionsFor definitions of terms and symbols usedin this practice,refer to Terminology C168.For definitions of1This practice is under the jurisdiction of ASTM Committee C16 on Therma
14、lInsulation and is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved March 1,2019.Published March 2019.Originallyapproved in 1985.Last previous edition approved in 2016 as C1043 16.DOI:10.1520/C1043-19.2The boldface numbers in parentheses refer to a list
15、 of references at the end ofthis practice.3Available from ASTM Headquarters.Order Adjunct:ADJC1043.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document
16、 Summary page onthe ASTM website.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 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.1 terms relating to the guarded-hot-plate app
