ASTM C1044-98(2003)

Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode

SCOPE
1.1 This practice covers the determination of the steady-state heat flow through the meter section of a specimen when a guarded-hot-plate apparatus or thin-heater apparatus is used in the single-sided mode of operation.
1.2 This practice provides a supplemental procedure for use in conjunction with either Test Method C 177 or C 1114 for testing a single specimen. This practice is limited to only the single-sided mode of operation, and, in all other particulars, the requirements of either Test Method C 177 or C 1114 apply.
Note 1—Test Methods C 177 and C 1114 describe the use of the guarded-hot-plate and thin-heater apparatus, respectively, for determining steady-state heat flux and thermal transmission properties of flat-slab specimens. In principle, these methods cover both the double- and single-sided mode of operation, and at present, do not distinguish between the accuracies for the two modes of operation. When appropriate, thermal transmission properties shall be calculated in accordance with Practice C 1045.
1.3 This practice requires that the cold plates of the apparatus have independent temperature controls. For the single-sided mode of operation, a (single) specimen is placed between the hot plate and the cold plate. Auxiliary thermal insulation, if needed, is placed between the hot plate and the auxiliary cold plate. The auxiliary cold plate and the hot plate are maintained at essentially the same temperature. Ideally, the heat flow from the meter plate is assumed to flow only through the specimen, so that the thermal transmission properties correspond only to the specimen.
Note 2—The double-sided mode of operation requires similar specimens placed on either side of the hot plate. The cold plates that contact the outer surfaces of these specimens are maintained at essentially the same temperature. The electric power supplied to the meter plate is assumed to result in equal heat flow through the meter section of each specimen, so that the thermal transmission properties 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 may be either larger or smaller in lateral dimensions than either the test specimen or the cold plate.
Note 3—Most guarded-hot-plate apparatus are designed for the double-sided mode of operation (). Consequently, the cold plate and the auxiliary cold plate are the same size and the specimen and the auxiliary insulation will have the same lateral dimensions, although the thickness may be different. Some guarded-hot-plate apparatus, however, are designed specifically for testing only a single specimen that may be either larger or smaller in lateral dimensions than that auxiliary insulation or the auxiliary cold plate.
1.5 This practice can be used for both low- and high-temperature conditions.
1.6 This practice shall not be used when operating an apparatus in a double-sided mode of operation with a known and unknown specimen, that is, with the two cold plates at similar temperatures so that the temperature differences across the known and unknown specimens are similar.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Apr-2003
• ICS: 17.200.10 - Heat. Calorimetry
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.30 - Thermal Measurement

Relations

• Replaces: ASTM C1044-98 - Standard Practice for Using the Guarded-Hot-Plate Apparatus in the One-Sided Mode to Measure Steady-State Heat Flux and Thermal Transmission Properties
• Effective Date: 10-Apr-2003
• Replaced By: ASTM C1044-07 - Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
• Effective Date: 01-Sep-2007
• Referred By: ASTM C1045-19 - Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
• Effective Date: 10-Apr-2003
• Referred By: ASTM C1130-21 - Standard Practice for Calibration of Thin Heat Flux Transducers
• Effective Date: 10-Apr-2003
• Referred By: ASTM C1043-19 - Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources
• Effective Date: 10-Apr-2003
• Referred By: ASTM C1470-20 - Standard Guide for Testing the Thermal Properties of Advanced Ceramics
• Effective Date: 10-Apr-2003
• Referred By: ASTM C1114-06(2019) - Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus
• Effective Date: 10-Apr-2003
• Referred By: ASTM C177-19e1 - Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
• Effective Date: 10-Apr-2003
• Referred By: ASTM C1558-19 - Standard Guide for Development of Standard Data Records for Computerization of Thermal Transmission Test Data for Thermal Insulation
• Effective Date: 10-Apr-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 1044 – 98 (Reapproved 2003)
Standard Practice for
Using a Guarded-Hot-Plate Apparatus or Thin-Heater
1
Apparatus in the Single-Sided Mode
This standard is issued under the fixed designation C 1044; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope either larger or smaller in lateral dimensions than either the test
specimen or the cold plate.
1.1 This practice covers the determination of the steady-
state heat flow through the meter section of a specimen when
NOTE 3—Most guarded-hot-plate apparatus are designed for the
2
a guarded-hot-plate apparatus or thin-heater apparatus is used
double-sided mode of operation (1). Consequently, the cold plate and the
auxiliary cold plate are the same size and the specimen and the auxiliary
in the single-sided mode of operation.
insulation will have the same lateral dimensions, although the thickness
1.2 This practice provides a supplemental procedure for use
may be different. Some guarded-hot-plate apparatus, however, are de-
in conjunction with either Test Method C 177 or C 1114 for
signed specifically for testing only a single specimen that may be either
testing a single specimen. This practice is limited to only the
larger or smaller in lateral dimensions than that auxiliary insulation or the
single-sidedmodeofoperation,and,inallotherparticulars,the
auxiliary cold plate.
requirements of either Test Method C 177 or C 1114 apply.
1.5 This practice can be used for both low- and high-
NOTE 1—Test Methods C 177 and C 1114 describe the use of the
temperature conditions.
guarded-hot-plate and thin-heater apparatus, respectively, for determining
1.6 This practice shall not be used when operating an
steady-state heat flux and thermal transmission properties of flat-slab
apparatus in a double-sided mode of operation with a known
specimens. In principle, these methods cover both the double- and
and unknown specimen, that is, with the two cold plates at
single-sided mode of operation, and at present, do not distinguish between
similar temperatures so that the temperature differences across
the accuracies for the two modes of operation. When appropriate, thermal
the known and unknown specimens are similar.
transmission properties shall be calculated in accordance with Practice
C 1045. 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.3 This practice requires that the cold plates of the appa-
responsibility of the user of this standard to establish appro-
ratus have independent temperature controls. For the single-
priate safety and health practices and determine the applica-
sidedmodeofoperation,a(single)specimenisplacedbetween
bility of regulatory limitations prior to use.
the hot plate and the cold plate.Auxiliary thermal insulation, if
needed, is placed between the hot plate and the auxiliary cold
2. Referenced Documents
plate. The auxiliary cold plate and the hot plate are maintained
2.1 ASTM Standards:
at essentially the same temperature. Ideally, the heat flow from
3
C 168 Terminology Relating to Thermal Insulation
the meter plate is assumed to flow only through the specimen,
C 177 Test Method for Steady-State Heat Flux Measure-
so that the thermal transmission properties correspond only to
ments and Thermal Transmission Properties by Means of
the specimen.
3
the Guarded-Hot-Plate Apparatus
NOTE 2—The double-sided mode of operation requires similar speci-
C 518 Test Method for Steady-State Thermal Transmission
mensplacedoneithersideofthehotplate.Thecoldplatesthatcontactthe
3
Properties by Means of the Heat-Flow Meter Apparatus
outer surfaces of these specimens are maintained at essentially the same
C 1045 Practice for Calculating Thermal Transmission
temperature. The electric power supplied to the meter plate is assumed to
3
Properties Under Steady-State Conditions
result in equal heat flow through the meter section of each specimen, so
C 1114 TestMethodforSteady-StateThermalTransmission
that the thermal transmission properties correspond to an average for the
3
two specimens.
Properties by Means of the Thin-Heater Apparatus
1.4 This practice does not preclude the use of a guarded-
3. Terminology
hot-plate apparatus in which the auxiliary cold plate may be
3.1 Definitions—For definitions of terms used in this prac-
tice, refer to Terminology C 168. For definitions of terms
1
This practice is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
2
Measurements. The boldface numbers in parentheses refer to the
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