【英文标准名称】: Standard Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions 【原文标准名称】: 稳态条件下热传递性能的计算用标准实施规程 【标准号】: ASTM C1045-2007 【标准状态】: 现行 【国别】: 【发布日期】: 2007 【实施或试行日期】: 【发布单位】: 美国材料与试验协会(US-ASTM)【起草单位】: C16.30【标准类型】: (Practice)【标准水平】: ()【中文主题词】: 建筑;热流;热传递;测量;工艺;特性;隔热【英文主题词】: calculation; thermal conductance; thermal conductivity; thermal properties; thermal resistance; thermal resistivity; thermal transmission【摘要】: 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 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 C 177, C 335, C 518, C 1033, C 1114 and C 1363 and Practices C 1043 and C 1044 by permitting use of these standard calculation forms by reference.1.2 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.1.3 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 C 680.1.4 The SI unit values used in this practice are considered standard.1.5 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 7.1.6 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) a phase change of one of the insulation system components such as a blowing gas in foam; and (3) the influence of heat flow direction and temperature difference changes for reflective insulations.【中国标准分类号】: A42【国际标准分类号】: 17_200_10【页数】: 13P.;A4【正文语种】: 作者: crcr 时间: 2016-7-17 11:40:47