ASTM C1199-00
(Test Method)Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods
Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods
SCOPE
1.1 This test method covers requirements and guidelines and specifies calibration procedures required for the measurement of the steady-state thermal transmittance of fenestration systems installed vertically in the test chamber. This test method specifies the necessary measurements to be made using measurement systems conforming to either Test Methods C236, C976, or C1363 for determination of fenestration system thermal transmittance.
Note 1--This test method allows the testing of projecting fenestration products (that is, garden windows, skylights, and roof windows) installed vertically in a surround panel. Current research on skylights, roof windows, and projecting products hopefully will provide additional information that can be added to the next version of this test method so that skylight and roof windows can be tested horizontally or at some angle typical of a sloping roof.
1.2 This test method refers to the thermal transmittance, U, and the corresponding thermal resistance, R, of a fenestration system installed vertically in the absence of solar and air leakage effects.
Note 2--The methods described in this document may also be adapted for use in determining the thermal transmittance of sections of building wall, and roof and floor assemblies containing thermal anomalies, which are smaller than the hot box metering area.
1.3 This test method describes how to determine a fenestration product's (also called test specimen) thermal transmittance, US, at well-defined environmental conditions. The thermal transmittance, which is sometimes called the air-to-air U-factor, is also a reported test result from Test Methods C236, C976, and C1363. If only the thermal transmittance is reported using this test method, the test report must also include a detailed description of the environmental conditions in the thermal chamber during the test as outlined in 10.3.
1.4 For rating purposes, this test method also describes how to calculate a standardized thermal transmittance, UST, which can be used to compare test results from laboratories with different weather side wind directions and thermal chamber configurations, and can also be used to directly compare to calculated results from current computer programs for determining the thermal transmittance of fenestration products. Although this test method specifies two methods of calculating the standardized thermal transmittance, only the standardized thermal transmittance result from one method is reported for each test. One standardized thermal transmittance calculation procedure is the Calibration Transfer Standard (CTS) method and another is the area weighting (AW) method (see 4.3 and Section 8 for further descriptions of these two methods). The area weighting method requires that the surface temperatures on both sides of the test specimen be directly measured as specified in Practice E1423 in order to determine the surface heat transfer coefficients on the fenestration product during the test. The CTS method does not use the measured surface temperatures on the test specimen and instead utilizes the calculation of equivalent surface temperatures from calibration data to determine the test specimen surface heat transfer coefficients. The area weighting (AW) method shall be used whenever the thermal transmittance, US, is greater than 3.4 W/(m2K) {0.6 Btu/(hrFt 2oF)}, or when the ratio of test specimen projected surface area to wetted (that is, total heat transfer or developed) surface area on either side of the test specimen is less than 0.80. Otherwise the CTS method shall be used to standardize the thermal transmittance results.
1.5 A discussion of the terminology and underlying assumptions for measuring the thermal transmittance are included.
1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.7 This standard does not purport to address all of the safety concern...
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Designation:C1199–00
Standard Test Method for
Measuring the Steady-State Thermal Transmittance of
1
Fenestration Systems Using Hot Box Methods
This standard is issued under the fixed designation C 1199; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope configurations, and can also be used to directly compare to
calculated results from current computer programs for deter-
1.1 This test method covers requirements and guidelines
mining the thermal transmittance of fenestration products.
and specifies calibration procedures required for the measure-
Although this test method specifies two methods of calculating
ment of the steady-state thermal transmittance of fenestration
the standardized thermal transmittance, only the standardized
systems installed vertically in the test chamber. This test
thermal transmittance result from one method is reported for
methodspecifiesthenecessarymeasurementstobemadeusing
each test. One standardized thermal transmittance calculation
measurement systems conforming to either Test Methods
procedure is the Calibration Transfer Standard (CTS) method
C 236, C 976, or C 1363 for determination of fenestration
and another is the area weighting (AW) method (see 4.3 and
system thermal transmittance.
Section 8 for further descriptions of these two methods). The
NOTE 1—This test method allows the testing of projecting fenestration
area weighting method requires that the surface temperatures
products (that is, garden windows, skylights, and roof windows) installed
on both sides of the test specimen be directly measured as
vertically in a surround panel. Current research on skylights, roof
specified in Practice E 1423 in order to determine the surface
windows, and projecting products hopefully will provide additional
heat transfer coefficients on the fenestration product during the
information that can be added to the next version of this test method so
that skylight and roof windows can be tested horizontally or at some angle test. The CTS method does not use the measured surface
typical of a sloping roof.
temperatures on the test specimen and instead utilizes the
calculation of equivalent surface temperatures from calibration
1.2 This test method refers to the thermal transmittance, U,
data to determine the test specimen surface heat transfer
and the corresponding thermal resistance, R, of a fenestration
coefficients. The area weighting (AW) method shall be used
system installed vertically in the absence of solar and air
whenever the thermal transmittance, U , is greater than 3.4
S
leakage effects.
2 2
W/(m •K) {0.6 Btu/(hr•Ft •°F)}, or when the ratio of test
NOTE 2—The methods described in this document may also be adapted
specimen projected surface area to wetted (that is, total heat
for use in determining the thermal transmittance of sections of building
transfer or developed) surface area on either side of the test
wall, and roof and floor assemblies containing thermal anomalies, which
specimen is less than 0.80. Otherwise the CTS method shall be
are smaller than the hot box metering area.
used to standardize the thermal transmittance results.
1.3 This test method describes how to determine a fenestra-
1.5 Adiscussionoftheterminologyandunderlyingassump-
tion product’s (also called test specimen) thermal transmit-
tions for measuring the thermal transmittance are included.
tance, U , at well-defined environmental conditions. The ther-
S
1.6 The values stated in SI units are to be regarded as the
mal transmittance, which is sometimes called the air-to-air
standard. The values given in parentheses are provided for
U-factor,isalsoareportedtestresultfromTestMethodsC 236,
information purposes only.
C 976, and C 1363. If only the thermal transmittance is
1.7 This standard does not purport to address all of the
reported using this test method, the test report must also
safety concerns, if any, associated with its use. It is the
include a detailed description of the environmental conditions
responsibility of the user of this standard to establish appro-
in the thermal chamber during the test as outlined in 10.3.
priate safety and health practices and determine the applica-
1.4 For rating purposes, this test method also describes how
bility of regulatory limitations prior to use.
to calculate a standardized thermal transmittance, U , which
ST
can be used to compare test results from laboratories with
2. Referenced Documents
different weather side wind directions and thermal chamber
2.1 ASTM Standards:
C 168 Terminology Relating to Thermal Insulating Materi-
2
als
1
Thistestmethodisunderth
...
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