1、Designation:C104416Standard Practice forUsing a Guarded-Hot-Plate Apparatus or Thin-HeaterApparatus in the Single-Sided Mode1This standard is issued under the fixed designation C1044;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,th
2、e 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.1.Scope1.1 This practice covers the determination of the steady-state heat flow through the meter section of a specimen when
3、a guarded-hot-plate apparatus or thin-heater apparatus is usedin the single-sided mode of operation.1.2 This practice provides a supplemental procedure for usein conjunction with either Test Method C177 or C1114 fortesting a single specimen.This practice is limited to only thesingle-sided mode of op
4、eration,and,in all other particulars,therequirements of either Test Method C177 or C1114 apply.NOTE1Test Methods C177 and C1114 describe the use of theguarded-hot-plate and thin-heater apparatus,respectively,for determiningsteady-state heat flux and thermal transmission properties of flat-slabspecim
5、ens.In principle,these methods cover both the double-andsingle-sided mode of operation,and at present,do not distinguish betweenthe accuracies for the two modes of operation.When appropriate,thermaltransmission properties shall be calculated in accordance with PracticeC1045.1.3 This practice require
6、s that the cold plates of the appa-ratus have independent temperature controls.For the single-sided mode of operation,a(single)specimen is placed betweenthe hot plate and the cold plate.Auxiliary thermal insulation,ifneeded,is placed between the hot plate and the auxiliary coldplate.The auxiliary co
7、ld plate and the hot plate are maintainedat the same temperature.The heat flow from the meter plate isassumed to flow only through the specimen,so that the thermaltransmission properties correspond only to the specimen.NOTE2The double-sided mode of operation requires similar speci-mens placed on eit
8、her side of the hot plate.The cold plates that contact theouter surfaces of these specimens are maintained at the same temperature.The electric power supplied to the meter plate is assumed to result in equalheat flow through the meter section of each specimen,so that the thermaltransmission properti
9、es correspond to an average for the two specimens.1.4 This practice does not preclude the use of a guarded-hot-plate apparatus in which the auxiliary cold plate is eitherlarger or smaller in lateral dimensions than either the testspecimen or the cold plate.NOTE3Most guarded-hot-plate apparatus are d
10、esigned for the double-sided mode of operation(1).2Consequently,the cold plate and theauxiliary cold plate are the same size and the specimen and the auxiliaryinsulation will have the same lateral dimensions,although the thicknessesneed not be the same.Some guarded-hot-plate apparatus,however,aredes
11、igned specifically for testing only a single specimen that is either largeror smaller in lateral dimensions than the auxiliary insulation or theauxiliary cold plate.1.5 This practice is suitable for use for both low-andhigh-temperature conditions.1.6 This practice shall not be used when operating an
12、apparatus in a double-sided mode of operation with a knownand unknown specimen,that is,with the two cold plates atsimilar temperatures so that the temperature differences acrossthe known and unknown specimens are similar.1.7 This standard does not purport to address all of thesafety concerns,if any,
13、associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3C168 Terminology Relating to Thermal Insulation3C177 Te
14、st Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate Apparatus3C518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter Apparatus3C1045 Practice for Calculating Thermal Transmission Prop-erties
15、 Under Steady-State Conditions3C1114 Test Method for Steady-State Thermal TransmissionProperties by Means of the Thin-Heater Apparatus3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology C168.For definitions of terms1This practice is under the jurisdiction o
16、f ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1985.Last previous edition approved in 2012 as C1044 12.DOI:10.1520/C1044-16.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For A
