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ASTM - C1045

Standard Practice for Calculating Thermal Transmission Properties Under Steady- State Conditions

active, Most Current
Organization: ASTM
Publication Date: 1 April 2019
Status: active
Page Count: 13
ICS Code (Heat. Calorimetry): 17.200.10
scope:

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. 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.

The 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.

This 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.

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

This 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.

This 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.

This 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.

Document History

C1045
April 1, 2019
Standard Practice for Calculating Thermal Transmission Properties Under Steady- State Conditions
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...
November 1, 2007
Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
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...
November 1, 2007
Standard Practice for Calculating Thermal Transmission Properties Under Steady- State Conditions
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...
March 10, 2001
Standard Practice for Calculating Thermal Transmission Properties under Steady-State Conditions
1. Scope 1.1 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...
August 10, 1997
Standard Practice for Calculating Thermal Transmission Properties under Steady-State Conditions
1. Scope 1.1 This practice covers requirements and guidelines for the determination of thermal transmission properties based upon steady-state one dimensional heat transfer tests on a thermal...
July 27, 1990
Standard Practice for Calculating Thermal Transmission Properties from Steady-State Heat Flux Measurements
A description is not available for this item.
October 22, 1985
STANDARD PRACTICE FOR CALCULATING THERMAL TRANSMISSION PROPERTIES FROM STEADY-STATE HEAT FLUX MEASUREMENTS
A description is not available for this item.

References

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