ASTM C1044-07
Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- Standard No.
- ASTM C1044-07
- Release Date
- 2007
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM C1044-12
- Latest
- ASTM C1044-24
- Scope
This practice provides a procedure for operating the apparatus so that the heat flow, Q′, through the meter section of the auxiliary insulation is small; determining Q′; and, calculating the heat flow, Q, through the meter section of the specimen.
This practice requires that the apparatus have independent temperature controls in order to operate the cold plate and auxiliary cold plate at different temperatures. In the single-sides mode, the apparatus is operated with the temperature of the auxiliary cold plate maintained, as close as possible, to the temperature of the side of the hot plate adjacent to the auxiliary insulation.
Note 48212;Ideally, if the temperature difference across the auxiliary insulation is zero and there are no edge heat losses or gains, all of the power input to the meter plate will flow through the specimen. In practice, a small correction is made for heat flow, Q′, through the auxiliary insulation.
The thermal conductance, C′, of the auxiliary insulation must be determined from one or more separate tests using either Test Method C 177
, C 1114 , or as indicated in 5.4. The values of C′ should be checked periodically, particularly if during regular testing it is not possible to keep the temperature drop across the auxiliary insulation less than 1 % of the temperature drop across the test specimen. This practice can be used when it is desirable to determine the thermal properties of a single specimen. For example, the thermal properties of a single specimen are used to calibrate a heat-flow-meter apparatus for Test Method C 518
. In other cases, there may be only one specimen available. 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 sp......
ASTM C1044-07 Referenced Document
- ASTM C1045 Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
- ASTM C1114 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus
- ASTM C168 Standard Terminology Relating to Thermal Insulation
- ASTM C177 Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
- ASTM C518 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
ASTM C1044-07 history
- 2024 ASTM C1044-24 Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 2020 ASTM C1044-16(2020) Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 2016 ASTM C1044-16 Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 2012 ASTM C1044-12 Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 2007 ASTM C1044-07 Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 1998 ASTM C1044-98(2003) Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode
- 1998 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
