ASTM C1667-09
(Test Method)Standard Test Method for Using Heat Flow Meter Apparatus to Measure the Center-of-Panel Thermal Resistivity of Vacuum Panels
Standard Test Method for Using Heat Flow Meter Apparatus to Measure the Center-of-Panel Thermal Resistivity of Vacuum Panels
SIGNIFICANCE AND USE
Heat flow meter apparatus are being used to measure the center-of-panel portion of a vacuum insulation panel, which typically has a very high value of thermal resistivity (that is, equal to or greater than 90 m-K/W). As described in Specification C 1484, the center-of-panel thermal resistivity is used, along with the panel geometry and barrier material thermal conductivity, to determine the effective thermal resistance of the evacuated panel.
Using a heat flow meter apparatus to measure the thermal resistivity of non-homogenous and high thermal resistance specimens is a non-standard application of the equipment, and shall only be performed by qualified personnel with understanding of heat transfer and error propagation. Familiarity with the configuration of both the apparatus and the vacuum panel is necessary.
The center-of-panel thermal transmission properties of evacuated panels vary due to the composition of the materials of construction, mean temperature and temperature difference, and the prior history. The selection of representative values for the thermal transmission properties of an evacuated panel for a particular application must be based on a consideration of these factors and will not apply necessarily without modification to all service conditions.
SCOPE
1.1 This test method covers the measurement of steady-state thermal transmission through the center of a flat rectangular vacuum insulation panel using a heat flow meter apparatus.
1.2 Total heat transfer through the non-homogenous geometry of a vacuum insulation panel requires the determination of several factors, as discussed in Specification C 1484. One of those factors is the center-of-panel thermal resistivity. The center-of-panel thermal resistivity is an approximation of the thermal resistivity of the core evacuated region.
1.3 This test method is based upon the technology of Test Method C 518 but includes modifications for vacuum panel applications as outlined in this test method.
1.4 This test method shall be used in conjunction with Practice C 1045 and Practice C 1058.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
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Designation: C1667 − 09
StandardTest Method for
Using Heat Flow Meter Apparatus to Measure the Center-of-
1
Panel Thermal Resistivity of Vacuum Panels
This standard is issued under the fixed designation C1667; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope C740Practice for Evacuated Reflective Insulation In Cryo-
genic Service
1.1 Thistestmethodcoversthemeasurementofsteady-state
C1045Practice for Calculating Thermal Transmission Prop-
thermal transmission through the center of a flat rectangular
erties Under Steady-State Conditions
vacuum insulation panel using a heat flow meter apparatus.
C1058Practice for Selecting Temperatures for Evaluating
1.2 Total heat transfer through the non-homogenous geom-
and Reporting Thermal Properties of Thermal Insulation
etryofavacuuminsulationpanelrequiresthedeterminationof
C1484Specification for Vacuum Insulation Panels
several factors, as discussed in Specification C1484. One of
E691Practice for Conducting an Interlaboratory Study to
those factors is the center-of-panel thermal resistivity. The
Determine the Precision of a Test Method
center-of-panel thermal resistivity is an approximation of the
E177Practice for Use of the Terms Precision and Bias in
thermal resistivity of the core evacuated region.
ASTM Test Methods
1.3 This test method is based upon the technology of Test
3. Terminology
Method C518 but includes modifications for vacuum panel
2
applications as outlined in this test method. 3.1 Definitions—TerminologyC168appliestotermsusedin
this specification.
1.4 This test method shall be used in conjunction with
Practice C1045 and Practice C1058. 3.2 Definitions of Terms Specific to This Standard:
3.2.1 center-of-panel—the location at the center of the
1.5 The values stated in SI units are to be regarded as
largest planar surface of the panel, equidistant from each pair
standard. No other units of measurement are included in this
of opposite edges of that surface.
standard.
3.2.2 center-of-panel apparent thermal resistivity—the ther-
1.6 This standard does not purport to address all of the
malperformanceofvacuumpanelsincludesanedgeeffectdue
safety concerns, if any, associated with its use. It is the
to heat flow through the barrier material and this shunting of
responsibility of the user of this standard to establish appro-
heat around the evacuated volume of the panel becomes more
priate safety and health practices and determine the applica-
prevalentwithgreaterbarrierthermalconductivity,asshownin
bility of regulatory limitations prior to use.
Fig. 1. For panels larger than a minimum size (as described in
AnnexA1),thecenter-of-panelapparentthermalresistivityisa
2. Referenced Documents
close approximation of the intrinsic core thermal resistivity of
3
2.1 ASTM Standards:
the vacuum insulation panel. The effective thermal perfor-
C168Terminology Relating to Thermal Insulation
manceofapanelwillvarywiththesizeandshapeofthepanel.
C518Test Method for Steady-State Thermal Transmission
3.2.2.1 Discussion—Thermal resistivity, the reciprocal of
Properties by Means of the Heat Flow Meter Apparatus
apparent thermal conductivity, is used when discussing the
center-of-panel thermal behavior.
3.2.3 core—the material placed within the evacuated vol-
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal
ume of a vacuum insulation panel. This material may perform
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement.
any or all of the following functions: prevent panel collapse
Current edition approved April 1, 2009. Published May 2009. Originally
duetoatmosphericpressure,reduceradiationheattransfer,and
approved in 2007. Last previous edition approved in 2007 as C1667–07. DOI:
reduce gas-phase conduction.The apparent thermal conductiv-
10.1520/C1667-09.
2
ity of the core, or λ , is defined as the apparent thermal
AllreferencestoparticularsectionsofTestMethodC518withinthisdocument
core
refer to the 2004 edition of Test Method C518.
conductivity of the core material under the same vacuum that
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
would occur within a panel, but without the barrier material.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
This is the apparent thermal conductivity that would be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. measured in a vacuum chamber without the barrier material.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C1667–07 Designation:C1667–09
Standard Test Method for
Using Heat Flow Meter Apparatus to Measure the Center-of-
1
Panel Thermal Resistivity of Vacuum Panels
This standard is issued under the fixed designation C 1667; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers the measurement of steady-state thermal transmission through the center of a flat rectangular
vacuum insulation panel using a heat flow meter apparatus.
1.2 Total heat transfer through the non-homogenous geometry of a vacuum insulation panel requires the determination of
several factors, as discussed in Specification C 1484. One of those factors is the center-of-panel thermal resistivity. The
center-of-panel thermal resistivity is an approximation of the thermal resistivity of the core evacuated region.
1.3 This test method is based upon the technology of Test Method C 518 but includes modifications for vacuum panel
2
applications as outlined in this test method.
1.4 This test method shall be used in conjunction with Practice C 1045 and Practice C 1058.
1.5 Either SI or inch-pound units are acceptable in the report, unless otherwise specified.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
2. Referenced Documents
3
2.1 ASTM Standards:
C 168 Terminology Relating to Thermal Insulation
C 518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
C 740 Practice for Evacuated Reflective Insulation In Cryogenic Service
C 1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
C 1058 Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation
C 1484 Specification for Vacuum Insulation Panels Specification for Vacuum Insulation Panels
E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E 177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
3. Terminology
3.1 Definitions—Terminology C 168 applies to terms used in this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 center-of-panel—the location at the center ofthelargestplanarsurfaceofthepanel,equidistantfromeach pairofopposite
edges of that surface.
3.2.2 center-of-panel apparent thermal resistivity—the thermal performance of vacuum panels includes an edge effect due to
heat flow through the barrier material and this shunting of heat around the evacuated volume of the panel becomes more prevalent
with greater barrier thermal conductivity, as shown in Fig. 1. For panels larger than a minimum size (as described in Annex A1),
the center-of-panel apparent thermal resistivity is a close approximation of the intrinsic core thermal resistivity of the vacuum
insulation panel. The effective thermal performance of a panel will vary with the size and shape of the panel.
3.2.2.1 Discussion—Thermal resistivity, the reciprocal of apparent thermal conductivity, is used when discussing the
center-of-panel thermal behavior.
1
This test method is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
Measurement.
Current edition approved Sept. 1, 2007. Published September 2007.
Current edition approved April 1, 2009. Published May 2009. Originally approved in 2007. Last previous edition approved in 2007 as C 1667–07.
2
All references to particular sections of Test Method C 518 within this document refer to the 2004 edition of Test Method C 518.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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