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ASTM C 1045 : 2019
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Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
Hardcopy , PDF
English
01-04-2019
This practice provides the user with a uniform procedure for calculating the thermal transmission properties of a material or system from data generated by steady state, one dimensional test methods used to determine heat flux and surface temperatures.
Committee |
C 16
|
DocumentType |
Standard Practice
|
Pages |
13
|
PublisherName |
American Society for Testing and Materials
|
Status |
Current
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Supersedes |
1.1This practice provides the user with a uniform procedure for calculating the thermal transmission properties of a material or system from data generated by steady state, one dimensional test methods used to determine heat flux and surface temperatures. This practice is intended to eliminate the need for similar calculation sections in Test Methods C177, C335, C518, C1033, C1114 and C1363 and Practices C1043 and C1044 by permitting use of these standard calculation forms by reference.
1.2The thermal transmission properties described include: thermal conductance, thermal resistance, apparent thermal conductivity, apparent thermal resistivity, surface conductance, surface resistance, and overall thermal resistance or transmittance.
1.3This practice provides the method for developing the apparent thermal conductivity as a function of temperature relationship for a specimen from data generated by standard test methods at small or large temperature differences. This relationship can be used to characterize material for comparison to material specifications and for use in calculation programs such as Practice C680.
1.4The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5This practice includes a discussion of the definitions and underlying assumptions for the calculation of thermal transmission properties. Tests to detect deviations from these assumptions are described. This practice also considers the complicating effects of uncertainties due to the measurement processes and material variability. See Section 7.
1.6This practice is not intended to cover all possible aspects of thermal properties data base development. For new materials, the user should investigate the variations in thermal properties seen in similar materials. The information contained in Section 7, the Appendix and the technical papers listed in the References section of this practice may be helpful in determining whether the material under study has thermal properties that can be described by equations using this practice. Some examples where this method has limited application include: (1) the onset of convection in insulation as described in Reference (1); (2) while a phase change is taking place in one of the insulation components causing an unsteady-state condition; and (3) the influence of heat flow direction and temperature difference changes for reflective insulations.
1.7This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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ASTM C 1043 : 2019 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
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ASTM C 1043 : 2006 : R2010 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
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ASTM C 1363 : 2019 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus |
ASTM C 1058 : 1997 | Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation |
ASTM C 1363 : 2005 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus |
ASTM C 1363 : 1997 | Standard Test Method for the Thermal Performance of Building Assemblies by Means of a Hot Box Apparatus |
ASTM C 1058 : 2003 | Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation |
ASTM C 1044 : 2012 | Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode |
ASTM C 1044 : 2007 | Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode |
ASTM C 680 : 2019 | Standard Practice for Estimate of the Heat Gain or Loss and the Surface Temperatures of Insulated Flat, Cylindrical, and Spherical Systems by Use of Computer Programs |
ASTM C 1043 : 2024 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
ASTM C 680 : 1989 : R1995 : EDT 1 | Standard Practice for Determination of Heat Gain or Loss and the Surface Temperatures of Insulated Pipe and Equipment Systems by the Use of a Computer Program |
ASTM C 1114 : 2006 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus |
ASTM E 122 : 2017 : R2022 | Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process |
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ASTM C 1033 : 1985 : R1994 : EDT 1 | Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation Installed Vertically |
ASTM C 518 : 2002 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus |
ASTM C 1044 : 1998 | Standard Practice for Using the Guarded-Hot-Plate Apparatus in the One-Sided Mode to Measure Steady-State Heat Flux and Thermal Transmission Properties |
ASTM C 168 : 2024 | Standard Terminology Relating to Thermal Insulation |
ASTM C 1114 : 2000 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus |
ASTM C 1199 : 2014 | Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods |
ASTM C 1363 : 2011 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus |
ASTM C 1199 : 2000 | Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods |
ASTM C 1044 : 2024 | Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode |
ASTM C 1199 : 2000 : R2008 | Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods |
ASTM C 1033 : 1985 : R2000 | Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation Installed Vertically (Withdrawn 2003) |
ASTM C 1043 : 2016 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
ASTM C 1044 : 2016 : R2020 | Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode |
ASTM C 518 : 2021 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus |
ASTM C 1114 : 2000 : R2006 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus |
ASTM C 1043 : 2006 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
ASTM C 680 : 2004 : EDT 2 | Standard Practice for Estimate of the Heat Gain or Loss and the Surface Temperatures of Insulated Flat, Cylindrical, and Spherical Systems by Use of Computer Programs |
ASTM C 177 : 2019 : EDT 1 | Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus |
ASTM C 1044 : 2016 | Standard Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode |
ASTM C 168 : 2022 | Standard Terminology Relating to Thermal Insulation |
ASTM C 1058 : 2003 : R2008 | Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation |
ASTM C 680 : 2023 | Standard Practice for Estimate of the Heat Gain or Loss and the Surface Temperatures of Insulated Flat, Cylindrical, and Spherical Systems by Use of Computer Programs |
ASTM C 1043 : 1997 | Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources |
ASTM C 1199 : 2009 | Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods |
ASTM C 1363 : 2024 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus |
ASTM C 518 : 1998 | Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus |
ASTM C 1199 : 2012 | Standard Test Method for Measuring the Steady-State Thermal Transmittance of Fenestration Systems Using Hot Box Methods |
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