ASTM E1530-2011 Standard Test Method for Evaluating the Resistance to Thermal Transmission of Materials by the Guarded Heat Flow Meter Technique《保护热流计方法材料热传递阻力测定的标准试验方法》.pdf
《ASTM E1530-2011 Standard Test Method for Evaluating the Resistance to Thermal Transmission of Materials by the Guarded Heat Flow Meter Technique《保护热流计方法材料热传递阻力测定的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E1530-2011 Standard Test Method for Evaluating the Resistance to Thermal Transmission of Materials by the Guarded Heat Flow Meter Technique《保护热流计方法材料热传递阻力测定的标准试验方法》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E1530 11Standard Test Method forEvaluating the Resistance to Thermal Transmission ofMaterials by the Guarded Heat Flow Meter Technique1This standard is issued under the fixed designation E1530; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a steady-state technique for thedetermination of the resis
3、tance to thermal transmission (ther-mal resistance) of materials of thicknesses less than 25 mm.For homogeneous opaque solid specimens of a representativethickness, thermal conductivity can be determined (see Note1). This test method is useful for specimens having a thermalresistance in the range fr
4、om 10 to 400 3 10-4m2KW-1, whichcan be obtained from materials of thermal conductivity in theapproximate range from 0.1 to 30 Wm-1K-1over the approxi-mate temperature range from 150 to 600 K. It can be usedoutside these ranges with reduced accuracy for thicker speci-mens and for thermal conductivity
5、 values up to 60 Wm-1K-1.NOTE 1A body is considered homogeneous when the property to bemeasured is found to be independent of specimen dimensions.1.2 This test method is similar in concept to Test MethodC518, but is modified to accommodate smaller test specimens,having a higher thermal conductance.
6、In addition, significantattention has been paid to ensure that the thermal resistance ofcontacting surfaces is minimized and reproducible.1.3 The values stated in SI units are to be regarded asstandard. The additional values are mathematical conversionsto inch-pound units that are provided for infor
7、mation only andare not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulato
8、ry limitations prior to use.2. Related Documents2.1 ASTM Standards:2C518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC1045 Practice for CalculatingThermalTransmission Prop-erties Under Steady-State ConditionsE220 Test Method for Calibration of
9、 Thermocouples ByComparison TechniquesE1142 Terminology Relating to Thermophysical PropertiesE1225 Test Method for Thermal Conductivity of Solids byMeans of the Guarded-Comparative-Longitudinal HeatFlow TechniqueF104 Classification System for Nonmetallic Gasket Mate-rialsF433 Practice for Evaluating
10、 Thermal Conductivity of Gas-ket Materials3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 heat flux transducer (HFT)a device that produces anelectrical output that is a function of the heat flux, in apredefined and reproducible manner.3.1.2 thermal conductance (C)the time rate
11、 of heat fluxthrough a unit area of a body induced by unit temperaturedifference between the body surfaces.3.1.2.1 average temperature of a surfacethe area-weighted mean temperature of that surface.3.1.2.2 average (mean) temperature of a specimen (discshaped)the mean value of the upper and lower fac
12、e tempera-tures.1This test method is under the jurisdiction ofASTM Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.05 on Thermo-physical Properties.Current edition approved Aug. 15, 2011. Published September 2011. Originallyapproved in 1993. Last previous ed
13、ition approved in 2006 as E1530 06. DOI:10.1520/E1530-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Cop
14、yright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 thermal conductivity (l)(of a solid material)thetime rate of heat flow, under steady conditions, through unitarea, per unit temperature gradient in the direction perpendicu-lar to the
15、 area:3.1.3.1 apparent thermal conductivitywhen other modesof heat transfer through a material are present in addition toconduction, the results of the measurements performed inaccordance with this test method will represent the apparent oreffective thermal conductivity for the material tested.3.1.4
16、 thermal resistance (R)the reciprocal of thermalconductance.3.2 Symbols:3.2.1 lthermal conductivity, Wm-1K-1or Btuin.h-1ft-2F-1.3.2.2 Cthermal conductance, Wm-2K-1or Btuh-1ft-2F-1.3.2.3 Rthermal resistance, m2KW-1or hft2FBtu-1.3.2.4 Dxspecimen thickness, mm or in.3.2.5 Aspecimen cross-sectional area
17、, m2or ft2.3.2.6 Qheat flow, W or Btuh-1.3.2.7 fheat flux transducer output, mV.3.2.8 Nheat flux transducer calibration constant,Wm-2mV-1or Btuh-1ft-2mV-1.3.2.9 Nfheat flux, Wm2or Btuh-1ft2.3.2.10 DTtemperature difference, C or F.3.2.11 Tgtemperature of guard heater, C or F.3.2.12 Tutemperature of u
18、pper heater, C or F.3.2.13 Tltemperature of lower heater, C or F.3.2.14 T1temperature of one surface of the specimen, Cor F.3.2.15 T2temperature of the other surface of the speci-men, C or F.3.2.16 Tmmean temperature of the specimen, C or F.3.2.17sunknown specimen.3.2.18rknown calibration or referen
19、ce specimen.3.2.19ocontacts.4. Summary of Test Method4.1 A specimen and a heat flux transducer (HFT) aresandwiched between two flat plates controlled at differenttemperatures, to produce a heat flow through the test stack. Areproducible load is applied to the test stack by pneumatic orother means, t
20、o ensure that there is a reproducible contactresistance between the specimen and plate surfaces. A guardsurrounds the test stack and is maintained at a uniform meantemperature of the two plates, in order to minimize lateral heatflow to and from the stack. At steady state, the difference intemperatur
21、e between the surfaces contacting the specimen ismeasured with temperature sensors embedded in the surfaces,together with the electrical output of the HFT. This output(voltage) is proportional to the heat flow through the specimen,the HFT and the interfaces between the specimen and theapparatus. The
22、 proportionality is obtained through prior cali-bration of the system with specimens of known thermalresistance measured under the same conditions, such thatcontact resistance at the surfaces is made reproducible.5. Significance and Use5.1 This test method is designed to measure and comparethermal p
23、roperties of materials under controlled conditions andtheir ability to maintain required thermal conductance levels.6. Apparatus6.1 Aschematic rendering of a typical apparatus is shown inFig. 1. The relative position of the HFT to the specimen is notimportant (it may be on the hot or cold side) as t
24、he test methodis based on maintaining axial heat flow with minimal radialheat losses or gains. It is also up to the designer whether tochoose heat flow upward or downward or horizontally, al-though downward heat flow in a vertical stack is the mostcommon one.6.2 Key Components of a Typical Device (T
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