ASTM C1363-05
(Test Method)Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus
SCOPE
1.1 This test method establishes the principles for the design of a hot box apparatus and the minimum requirements for the determination of the steady state thermal performance of building assemblies when exposed to controlled laboratory conditions. This method is also used to measure the thermal performance of a building material at standardized test conditions such as those required in material Specifications C 739, C 764, C 1224 and Practice C 1373.
1.2 This test method is used for large homogeneous or non-homogeneous specimens. This test method applies to building structures or composite assemblies of building materials for which it is possible to build a representative specimen that fits the test apparatus. The dimensions of specimen projections or recesses are controlled by the design of the hot box apparatus. Some hot boxes are limited to planar or nearly planar specimens. However, larger hot boxes have been used to characterize projecting skylights and attic sections. See 3.2 for a definition of the test specimen and other terms specific to this method.
Note 1—This test method replaces Test Methods C 236, the Guarded Hot Box, and C 976, the Calibrated Hot Box which have been withdrawn. Test apparatus designed and operated previously under Test Methods C 236 and C 976 will require slight modifications to the calibration and operational procedures to meet the requirements of Test Method C 1363.²
1.3 A properly designed and operated hot box apparatus is directly analogous to the Test Method C 177 guarded hot plate for testing large specimens exposed to air induced temperature differences. The operation of a hot box apparatus requires a significant number of fundamental measurements of temperatures, areas and power. The equipment performing these measurements requires calibration to ensure that the data are accurate. During initial setup and periodic verification testing, each measurement system and sensor is calibrated against a standard traceable to a national standards laboratory. If the hot box apparatus has been designed, constructed and operated in the ideal manner, no further calibration or adjustment would be necessary. As such, the hot box is considered a primary method and the uncertainty of the result is analyzed by direct evaluation of the component measurement uncertainties of the instrumentation used in making the measurements.
1.3.1 In an ideal hotbox test of a homogenous material there is no temperature difference on either the warm or cold specimen faces to drive a flanking heat flow. In addition, there would be no temperature differences that would drive heat across the boundary of the metering chamber walls. However, experience has demonstrated that maintaining a perfect guard/metering chamber balance is not possible and small corrections are needed to accurately characterize all the heat flow paths from the metering chamber. To gain this final confidence in the test result, it is necessary to benchmark the overall result of the hot box apparatus by performing measurements on specimens having known heat transfer values and comparing those results to the expected values.
1.3.2 The benchmarking specimens are homogeneous panels whose thermal properties are uniform and predictable. These panels, or representative sections of the panels, have had their thermal performance measured on other devices that are directly traceable or have been favorably compared to a national standards laboratory. For example, a Test Method C 177 Hot Plate, a Test Method C 518 Heat Meter or another Test Method C 1363 Hot Box will provide adequate specimens. Note that the use of Test Method C 518 or similar apparatus creates additional uncertainty since those devices are calibrated using transfer standards or standard reference materials. By performing this benchmarking process, the hot box operator is able to develop the additional equations that predict the magnitude of the corrections to the net heat flow th...
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Designation: C1363 – 05
Standard Test Method for
Thermal Performance of Building Materials and Envelope
1
Assemblies by Means of a Hot Box Apparatus
This standard is issued under the fixed designation C1363; 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 box apparatus has been designed, constructed and operated in
theidealmanner,nofurthercalibrationoradjustmentwouldbe
1.1 Thistestmethodestablishestheprinciplesforthedesign
necessary.Assuch,thehotboxisconsideredaprimarymethod
of a hot box apparatus and the minimum requirements for the
and the uncertainty of the result is analyzed by direct evalua-
determination of the steady state thermal performance of
tion of the component measurement uncertainties of the
building assemblies when exposed to controlled laboratory
instrumentation used in making the measurements.
conditions. This method is also used to measure the thermal
1.3.1 Inanidealhotboxtestofahomogenousmaterialthere
performance of a building material at standardized test condi-
is no temperature difference on either the warm or cold
tions such as those required in material Specifications C739,
specimen faces to drive a flanking heat flow. In addition, there
C764, C1224 and Practice C1373.
would be no temperature differences that would drive heat
1.2 This test method is used for large homogeneous or
across the boundary of the metering chamber walls. However,
non-homogeneous specimens. This test method applies to
experience has demonstrated that maintaining a perfect guard/
building structures or composite assemblies of building mate-
meteringchamberbalanceisnotpossibleandsmallcorrections
rials for which it is possible to build a representative specimen
are needed to accurately characterize all the heat flow paths
that fits the test apparatus. The dimensions of specimen
fromthemeteringchamber.Togainthisfinalconfidenceinthe
projections or recesses are controlled by the design of the hot
testresult,itisnecessarytobenchmarktheoverallresultofthe
box apparatus. Some hot boxes are limited to planar or nearly
hot box apparatus by performing measurements on specimens
planarspecimens.However,largerhotboxeshavebeenusedto
havingknownheattransfervaluesandcomparingthoseresults
characterize projecting skylights and attic sections. See 3.2 for
to the expected values.
adefinitionofthetestspecimenandothertermsspecifictothis
1.3.2 The benchmarking specimens are homogeneous pan-
method.
els whose thermal properties are uniform and predictable.
NOTE 1—This test method replaces Test Methods C236, the Guarded
Thesepanels,orrepresentativesectionsofthepanels,havehad
Hot Box, and C976, the Calibrated Hot Box which have been withdrawn.
their thermal performance measured on other devices that are
Test apparatus designed and operated previously under Test Methods
directly traceable or have been favorably compared to a
C236 and C976 will require slight modifications to the calibration and
2
national standards laboratory. For example, a Test Method
operational procedures to meet the requirements of Test Method C1363.
C177 Hot Plate, a Test Method C518 Heat Meter or another
1.3 A properly designed and operated hot box apparatus is
TestMethodC1363HotBoxwillprovideadequatespecimens.
directly analogous to the Test Method C177 guarded hot plate
Note that the use of Test Method C518 or similar apparatus
for testing large specimens exposed to air induced temperature
createsadditionaluncertaintysincethosedevicesarecalibrated
differences. The operation of a hot box apparatus requires a
using transfer standards or standard reference materials. By
significant number of fundamental measurements of tempera-
performing this benchmarking process, the hot box operator is
tures, areas and power. The equipment performing these
able to develop the additional equations that predict the
measurements requires calibration to ensure that the data are
magnitude of the corrections to the net heat flow through the
accurate. During initial setup and periodic verification testing,
specimen that account for any hot box wall loss and flanking
each measurement system and sensor is calibrated against a
loss. This benchmarking provides substantial confidence that
standard traceable to a national standards laboratory. If the hot
any extraneous heat flows can be eliminated or quantified with
sufficient accuracy to be a minor factor of the overall uncer-
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal tainty.
Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal
1.4 In order to ensure an acceptable level of result uncer-
Measureme
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