ASTM C1043-2016 Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources《使用圆形线性加热源的护热板设计的标准实施规程》.pdf
《ASTM C1043-2016 Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources《使用圆形线性加热源的护热板设计的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1043-2016 Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources《使用圆形线性加热源的护热板设计的标准实施规程》.pdf(21页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1043 06 (Reapproved 2010) C1043 16Standard Practice forGuarded-Hot-Plate Design Using Circular Line-HeatSources1This standard is issued under the fixed designation C1043; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, 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 practice covers the design of a circular line-heat-source guarded hot plate for use in accordance w
3、ithTest Method C177.NOTE 1Test Method C177 describes the guarded-hot-plate apparatus and the application of such equipment for determining thermal transmissionproperties of flat-slab specimens. In principle, the test method includes apparatus designed with guarded hot plates having either distribute
4、d- or line-heatsources.1.2 The guarded hot plate with circular line-heat sources is a design in which the meter and guard plates are circular plateshaving a relatively small number of heaters, each embedded along a circular path at a fixed radius. In operation, the heat from eachline-heat source flo
5、ws radially into the plate and is transmitted axially through the test specimens.1.3 The meter and guard plates are fabricated from a continuous piece of thermally conductive material. The plates are madesufficiently thick that, for typical specimen thermal conductances, the radial and axial tempera
6、ture variations in the guarded hotplate are quite small. By proper location of the line-heat source(s), the temperature at the edge of the meter plate can be is madeequal to the mean temperature of the meter plate, thus facilitating temperature measurements and thermal guarding.1.4 The line-heat-sou
7、rce guarded hot plate has been used successfully over a mean temperature range from 10 to + 65C, withcircular metal plates and a single line-heat source in the meter plate. The chronological development of the design of circularline-heat-source guarded hot plates is given in Refs (1-9).21.5 This pra
8、ctice does not preclude (1) lower or higher temperatures; (2) plate geometries other than circular; (3)line-heat-source geometries other than circular; (4) the use of plates fabricated from ceramics, composites, or other materials; or(5) the use of multiple line-heat sources in both the meter and gu
9、ard plates.1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to
10、establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:3C168 Terminology Relating to Thermal InsulationC177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properti
11、es by Means of theGuarded-Hot-Plate ApparatusC1044 Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided ModeE230 Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples2.2 ASTM Adjuncts:Line-Heat-Source Guarded-Hot-Plate
12、Apparatus41 This practice is under the jurisdiction ofASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.30 on Thermal Measurement.Current edition approved Sept. 1, 2010March 1, 2016. Published January 2011March 2016. Originally approved in 1985. Last previ
13、ous edition approved in 20062010 asC1043 06.C1043 06 (2010). DOI: 10.1520/C1043-06R10.10.1520/C1043-16.2 The boldface numbers in parentheses refer to a list of references at the end of this practice.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service
14、at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.4 Available from ASTM Headquarters. Order Adjunct: ADJC1043.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an
15、indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to
16、be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 DefinitionsFor definitions of terms and symbols used in this practice, refer to Terminology C168. For definitions of termsrelating t
17、o the guarded-hot-plate apparatus refer to Test Method C177.3.2 Definitions of Terms Specific to This Standard:3.2.1 gap, na separation between the meter plate and guard plate, usually filled with a gas or thermal insulation.3.2.2 guard plate, nthe outer ring of the guarded hot plate that encompasse
18、s the meter plate and promotes one-dimensionalheat flow normal to the meter plate.3.2.3 guarded hot plate, nan assembly, consisting of a meter plate and a co-planar, concentric guard plate,plate that providesthe heat input to the specimens.3.2.4 line-heat-source, na thin or fine electrical heating e
19、lement that provides uniform heat generation per unit length.3.2.5 meter area, nthe mathematical area through which the heat input to the meter plate flows normally under ideal guardingconditions into the meter section of the specimen.3.2.6 meter plate, nthe inner disk of the guarded hot plate that
20、contains one or more line-heat sources embedded in a circularprofile and provides the heat input to the meter section of the specimens.3.2.7 meter section, nthe portion of the test specimen (or auxiliary insulation) through which the heat input to the meter plateflows under ideal guarding conditions
21、.4. Significance and Use4.1 This practice describes the design of a guarded hot plate with circular line-heat sources and provides guidance indetermining the mean temperature of the meter plate. It provides information and calculation procedures for: (1) control of edgeheat loss or gain (AnnexA1); (
22、2) location and installation of line-heat sources (AnnexA2); (3) design of the gap between the meterand guard plates (Appendix X1); and (4) location of heater leads for the meter plate (Appendix X2).4.2 A circular guarded hot plate with one or more line-heat sources is amenable to mathematical analy
23、sis so that the meansurface temperature can be is calculated from the measured power input and the measured temperature(s) at one or more knownlocations. Further, a circular plate geometry simplifies the mathematical analysis of errors resulting from heat gains or losses atthe edges of the specimens
24、 (see Refs (10, 11).4.3 In practice, it is customary to place the line-heat source(s) The line-heat source(s) is (are) placed in the meter plate at aprescribed radius such that the temperature at the outer edge of the meter plate is equal to the mean surface temperature over themeter area. Thus, the
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