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使用圆形线性加热源的护热板设计的标准实施规程  
 【英文标准名称】  Standard Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources
 【原文标准名称】  使用圆形线性加热源的护热板设计的标准实施规程
 【标准号】  ASTM C1043-2006(2010)
 【标准状态】  Active
 【国别】  
 【发布日期】  2006
 【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】  防护热板装置;热流;线光源加热器;恒定态;导热性;隔热;热变电阻
 【英文主题词】  guarded hot plate apparatus;heat flow;line source heater;steady state;thermal conductivity ;thermal insulation;thermal resistance
 【摘要】  

This practice describes the design of a guarded hot plate with circular line-heat sources and provides guidance in determining the mean temperature of the meter plate. It provides information and calculation procedures for: (1) control of edge heat loss or gain (Annex A1); (2) location and installation of line-heat sources (Annex A2); (3) design of the gap between the meter and guard plates (Appendix X1); and (4) location of heater leads for the meter plate (Appendix X2).

A circular guarded hot plate with one or more line-heat sources is amenable to mathematical analysis so that the mean surface temperature can be calculated from the measured power input and the measured temperature(s) at one or more known locations. Further, a circular plate geometry simplifies the mathematical analysis of errors resulting from heat gains or losses at the edges of the specimens (see Refs (10, 11)).

In practice, it is customary to place the line-heat source(s) in the meter plate at a prescribed radius such that the temperature at the outer edge of the meter plate is equal to the mean surface temperature over the meter area. Thus, the determination of the mean temperature of the meter plate can be accomplished with a small number of temperature sensors placed near the gap.

A guarded hot plate with one or more line-heat sources will have a radial temperature variation, with the maximum temperature differences being quite small compared to the average temperature drop across the specimens. Provided guarding is adequate, only the mean surface temperature of the meter plate enters into calculations of thermal transmission properties.

Care must be taken to design a circular line-heat-source guarded hot plate so that the electric-current leads to each heater either do not significantly alter the temperature distributions in the meter and guard plates or else affect these temperature distributions in a known way so that appropriate corrections can be made.

The use of one or a few circular line-heat sources in a guarded hot plate simplifies construction and repair. For room-temperature operation, the plates are typically of one-piece metal construction and thus are easily fabricated to the required thickness and flatness. The design of the gap is also simplified, relative to gap designs for distributed-heat-source hot plates.

In the single-sided mode of operation (see Practice C1044), the symmetry of the line-heat-source design in the axial direction minimizes errors due to undesired heat flow across the gap.

1.1 This practice covers the design of a circular line-heat-source guarded hot plate for use in accordance with Test Method C177.

Note 18212;Test Method C177 describes the guarded-hot-plate apparatus and the application of such equipment for determining thermal transmission properties of flat-slab specimens. In principle, the test method includes apparatus designed with guarded hot plates having either distributed- or line-heat sources.

1.2 The guarded hot plate with circular line-heat sources is a design in which the meter and guard plates are circular plates having a relatively small number of heaters, each embedded along a circular path at a fixed radius. In operation, the heat from each line-heat source flows 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 conduc......

 【中国标准分类号】  
 【国际标准分类号】  17_200_10
 【页数】  16P.;A4
 【正文语种】  
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