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ASTM C1044-98

(Practice)

Standard Practice for Using the Guarded-Hot-Plate Apparatus in the One-Sided Mode to Measure Steady-State Heat Flux and Thermal Transmission Properties

Standard Practice for Using the Guarded-Hot-Plate Apparatus in the One-Sided Mode to Measure Steady-State Heat Flux and Thermal Transmission Properties

SCOPE
1.1 This practice covers the determination of the steady-state thermal transmission properties of insulating specimens using a guarded hot plate in a one-sided configuration. It represents a supplemental procedure to Test Method C177, which applies only to a two-sided configuration.  
1.2 This practice is limited to the difference in the procedure for measuring the heat flow between the two-sided method, Test Method C177, and this one-sided practice. For the rest of the practice, Test Method C177 applies.  
1.3 This practice can apply to both the low- and high-temperature apparatus described in Test Method C177.  
1.4 This standard does not purport to address the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-May-1998
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.30 - Thermal Measurement
Current Stage
Ref Project

Relations

Replaced By
ASTM C1044-98(2003) - Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
Effective Date
10-Apr-2003

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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 PropertiesASTM 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
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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
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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.
NOTE 3—Most guarded-hot-plate apparatus are designed for the
1. Scope
2
double-sided mode of operation (1). Consequently, the cold plate and the
1.1 This practice covers the determination of the steady-
auxiliary cold plate are the same size and the specimen and the auxiliary
state heat flow through the meter section of a specimen when
insulation will have the same lateral dimensions, although the thickness
a guarded-hot-plate apparatus or thin-heater apparatus is used
may be different. Some guarded-hot-plate apparatus, however, are de-
in the single-sided mode of operation. signed specifically for testing only a single specimen that may be either
larger or smaller in lateral dimensions than that auxiliary insulation or the
1.2 This practice provides a supplemental procedure for use
auxiliary cold plate.
in conjunction with either Test Method C 177 or C 1114 for
testing a single specimen. This practice is limited to only the 1.5 This practice can be used for both low- and high-
single-sided mode of operation, and, in all other particulars, the temperature conditions.
requirements of either Test Method C 177 or C 1114 apply.
1.6 This practice shall not be used when operating an
apparatus in a double-sided mode of operation with a known
NOTE 1—Test Methods C 177 and C 1114 describe the use of the
and unknown specimen, that is, with the two cold plates at
guarded-hot-plate and thin-heater apparatus, respectively, for determining
similar temperatures so that the temperature differences across
steady-state heat flux and thermal transmission properties of flat-slab
specimens. In principle, these methods cover both the double- and the known and unknown specimens are similar.
single-sided mode of operation, and at present, do not distinguish between
1.7 This standard does not purport to address all of the
the accuracies for the two modes of operation. When appropriate, thermal
safety concerns, if any, associated with its use. It is the
transmission properties shall be calculated in accordance with Practice
responsibility of the user of this standard to establish appro-
C 1045.
priate safety and health practices and determine the applica-
1.3 This practice requires that the cold plates of the appa-
bility of regulatory limitations prior to use.
ratus have independent temperature controls. For the single-
2. Referenced Documents
sided mode of operation, a (single) specimen is placed between
the hot plate and the cold plate. Auxiliary thermal insulation, if
2.1 ASTM Standards:
needed, is placed between the hot plate and the auxiliary cold
C 168 Terminology Relating to Thermal Insulating Materi-
3
plate. The auxiliary cold plate and the hot plate are maintained
als
at essentially the same temperature. Ideally, the heat flow from
C 177 Test Method for Steady-State Heat Flux Measure-
the meter plate is assumed to flow only through the specimen,
ments and Thermal Transmission Properties by Means of
3
so that the thermal transmission properties correspond only to
the Guarded-Hot-Plate Apparatus
the specimen.
C 518 Test Method for Steady-State Thermal Transmission
3
Properties by Means of the Heat-Flow Meter Apparatus
NOTE 2—The double-sided mode of operation requires similar speci-
C 1045 Practice for Calculating Thermal Transmission
mens placed on either side of the hot plate. The cold plates that contact the
3
outer surfaces of these specimens are maintained at essentially the same Properties Under Steady-State Conditions
temperature. The electric power supplied to the meter plate is assumed to
C 1114 Test Method for Steady-State Thermal Transmission
result in equal heat flow through the meter section of each specimen, so 3
Properties by Means of the Thin-Heater Apparatus
that the thermal transmission properties correspond to an average for the
two specimens.
3. Terminology
1.4 This practice does not preclude the use of a guarded-
3.1 Definitions—For definitions of terms used in this prac-
hot-plate apparatus in which the auxiliary cold plate may be
tice, refer to Terminology C 168. For definitions of terms
either larger or smaller in lateral dimensions than either the test
relating to the guarded-hot-plate apparatus or thin-he
...

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