AS 2464.6-1983

1 - AS 2464.6:1983 METHODS OF TESTING THERMAL INSULATION - STEADY– STATE THERMAL TRANSMISSION PROPERTIES BY MEANS OF THE GUARDED
2 - METHOD
2 - 1 SCOPE.
2 - 2 APPLICATION.
2 - 2.1 Measurement of Thermal Resistance and Thermal Conductance.
2 - 2.2 Measurement of Average Thermal Resistivity and Average Thermal Conductivity.
2 - 2.3 Applicability of Test Results to a Material.
2 - 3 REFERENCED DOCUMENTS.
3 - 4 DEFINITIONS.
3 - 4.1 Layered specimen
3 - 4.2 Homogeneous specimen
3 - 5 SYMBOLS.
3 - 6 APPARATUS.
3 - 6.1 General Features.
3 - 6.2 Heating Unit.
3 - 6.3 Gap and Surfaces.
3 - 6.4 Imbalance Detectors.
4 - 6.5 Cooling Units.
5 - 6.6 Temperature Detectors.
5 - 6.7 Clamping Force.
5 - 6.8 Temperature Difference Across Specimens.
6 - 6.9 Measurement System for Temperature Detector Outputs.
6 - 6.10 Edge Insulation.
7 - 6.11 Enclosure.
7 - 7 TEST SPECIMENS.
7 - 7.1 Selection and Size.
11 - 7.2 Specimen Preparation.
12 - 8 PROCEDURE.
12 - 8.1 Temperature Difference and Gradient.
12 - 8.2 Ambient Conditions.
12 - 8.3 Heat Flow Measurements.
12 - 8.4 Cold Surface Control.
12 - 8.5 Temperature Difference Detectors.
12 - 8.6 Equilibrium Time and Measurement Interval.
12 - 9 CALCULATIONS.
12 - 9.1 Density.
12 - 9.2 Change in Mass.
13 - 9.3 Mass Regain.
13 - 9.4 Transmission Properties.
13 - 10 REPORT.
13 - 10.1 Values Reported.
14 - 10.2 Graphs.
14 - 10.3 Statement of Compliance.
14 - 10.4 Calibration of Direct-reading Circuitry.
14 - 11 REFERENCES.
16 - APPENDIX A - SUGGESTED METHODS FOR PREPARING TEST SPECIMENS OF LOOSE MATERIALS WHERE NO METHOD IS SPECIFIED IN THE MATERIAL S
16 - A1 METHOD A.
16 - A2 METHOD B.
17 - APPENDIX B - MEASURING SYSTEM
17 - B1 GENERAL REQUIREMENTS.
17 - B2 MEASURING SYSTEM REQUIREMENTS FOR CERTIFICATION TESTING.
17 - B3 CALIBRATION OF COMPUTING CIRCUITRY.
18 - APPENDIX C - TESTS ON SPECIMENS TO DETERMINE APPLICABILITY OF THE METHOD
18 - C1 SCOPE.
18 - C2 DISTORTION OF THE HEAT FLOW IN THE SPECIMEN.
18 - C3 TEST FOR THERMAL SHORT-CIRCUITS.
18 - C3.1 General.
18 - C3.2 Simple Test.
18 - C4 DETERMINING THE THERMAL CONDUCTIVITY AND RESISTIVITY OF A MATERIAL.
18 - C4.1 General.
19 - C4.2 Dependence on Specimen Thickness.
19 - C4.3 Dependence on Temperature Difference.
19 - C4.4 Method of Determining Dependence on Temperature Difference.
19 - C4.5 Determination of Minimum Thickness for Which Thermal Properties of the Material may be definedc
19 - C4.6 Procedure.

Sets out the method for determining the steady-state thermal transmission properties of thermal insulating specimens using a guarded hotplate, within the limits set by Clauses 2.1, 2.2 and 2.3. For purposes of certification, this method is limited to specimens with thermal resistances greater than 0.017 m2.K/W in all directions.

This standard sets out the method for determining the steady-state thermal transmission properties of thermal insulating specimens using a guarded hotplate, within the limits set by Clauses 2.1, 2.2 and 2.3. For purposes of certification, this method is limited to specimens with thermal resistances greater than 0.017 m2.K/W in all directions (see Note 1).NOTES:1. Special techniques may be required for measuring surface temperatures with specimens having thermal resistances less than 0.1 m2.K/W.2. The accuracy of measurement on specimens of low-density thermal insulation by this standard may be difficult to verify and may require an extensive analysis of the equipment and/or a performance check using calibration standards having heat transmission characteristics and thickness similar to the test specimens.This standard is a primary method for measuring the thermal transmission properties of specimens, as only measurements of length, electrical power, and temperature difference are required.

Under Revision See DR 02026 CP