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ASTM-C1043:2010 Edition

ASTM-C1043:2010 Edition

$44.96

C1043-06(2010) Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources

Published By Publication Date Number of Pages
ASTM 2010 16
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ASTM C1043-06-Reapproved2010

Historical Standard: Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources

ASTM C1043

Scope

1.1 This practice covers the design of a circular line-heat-source guarded hot plate for use in accordance with Test Method C177.

Note 1ā€”Test Method C177 describes the guarded-hot-plate apparatus and the application of such equipment for determining thermal transmission properties of flat-slab specimens. In principle, the test method includes apparatus designed with guarded hot plates having either distributed- or line-heat sources.

1.2 The guarded hot plate with circular line-heat sources is a design in which the meter and guard plates are circular plates having a relatively small number of heaters, each embedded along a circular path at a fixed radius. In operation, the heat from each line-heat source flows radially into the plate and is transmitted axially through the test specimens.

1.3 The meter and guard plates are fabricated from a continuous piece of thermally conductive material. The plates are made sufficiently thick that, for typical specimen thermal conductances, the radial and axial temperature variations in the guarded hot plate are quite small. By proper location of the line-heat source(s), the temperature at the edge of the meter plate can be made equal to the mean temperature of the meter plate, thus facilitating temperature measurements and thermal guarding.

1.4 The line-heat-source guarded hot plate has been used successfully over a mean temperature range from āˆ’ 10 to + 65Ā°C, with circular metal plates and a single line-heat source in the meter plate. The chronological development of the design of circular line-heat-source guarded hot plates is given in Refs (1-9).

1.5 This practice does not preclude (1) lower or higher temperatures; (2) plate geometries other than circular; (3) line-heat-source geometries other than circular; (4) the use of plates fabricated from ceramics, composites, or other materials; or (5) the use of multiple line-heat sources in both the meter and guard plates.

1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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.

Keywords

guarded hot plate apparatus; heat flow; line source heater; steady state; thermal conductivity ; thermal insulation; thermal resistance; Thermal transmission properties; Circular line-heat sources; Heating tests–thermal insulation; Hot plate/box methods; Insulating materials; Isothermal conditions/testing; Line-source heater; R-value; Sensors; Temperature tests–thermal insulation; Thermal resistance/resistivity

ICS Code

ICS Number Code 17.200.10 (Heat. Calorimetry)

DOI: 10.1520/C1043-06R10

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 Significance and Use
Design of a Guarded Hot Plate with Circular Line-Heat Source(s)
FIG. 1
4 FIG. 2
6 Design Precautions
Keywords
A1. CONTROL OF EDGE HEAT LOSS OR GAIN
A1.1 Scope
A1.2 Theoretical Analysis
7 A1.3 Application
FIG. A1.1
FIG. A1.2
8 A2. LOCATION OF LINE-HEAT SOURCES
A2.1 Scope
A2.2 Meter Plate: Case 1
9 A2.3 Meter Plate: Case 2
TABLE A2.1
FIG. A2.1
10 A2.4 Guard Plate: Case 1
TABLE A2.2
FIG. A2.2
11 A2.5 Guard Plate: Case 2
TABLE A2.3
12 X1. ESTIMATION OF HEAT FLOW ACROSS THE GAP
X1.1 Scope
X1.2 Gap of Rectangular Cross-Section
X1.3 Gap of Circular Cross-Section
TABLE A2.4
13 X1.4 Gap of Diamond-Shaped Cross-Section
X1.5 Other Considerations
X2. ANGULAR LOCATION OF HEATER LEADS AND TEMPERATURE SENSORS
X2.1 Scope
X2.2 Theoretical Analysis
14 X3. COMMENTARY
X3.1 Introduction
X3.2 History of Practice C1043
FIG. X2.1
15 X3.3 Precision and Bias
REFERENCES

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