Variable thermal conductivity factor measuring apparatus and method

A technology of thermal conductivity, measuring device

Active Publication Date: 2008-10-22
SHANGHAI TIRE & RUBBER TIRE RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most devices ignore the change in heat flow of the heater itself due to the change in resistance with temperature
Usually only the thermal conductivity at a certain specified temperature can be measured by one experiment

Method used

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  • Variable thermal conductivity factor measuring apparatus and method
  • Variable thermal conductivity factor measuring apparatus and method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] As shown in Figure 1, the entire experimental device includes a closed support frame, in which the sample, heater, heat insulation layer, heat dissipation block, fastening cover plate, and thermocouple are all placed, and the air flow and other factors can be excluded in the closed area. Influence on the thermal insulation of the system, the thermocouple is placed on the upper and lower surfaces of the sample, and the surface temperature change of the sample is measured by the thermocouple. High pressure is applied to the cooling block, so that the cooling block and the sample are closely combined, thereby reducing the thermal resistance of the contact surface between the cooling block and the sample and the heater and the sample; the heat insulating material is surrounded around the sample and the heater to ensure that the system Good heat insul...

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Abstract

The invention discloses a method for measuring a variable thermal coefficient. The method is characterized by comprising the following steps that: A. a sample is arranged inside a closed supporting frame; one end of the sample closely contacts a plane heater and the other end of the sample closely contacts a heat-dissipation block; thermocouples are respectively arranged on both ends of the sample and contact a data acquisition unit; B. the sample is heated by the plane heater; measured values are acquired by the data acquisition unit; the hot-side temperature and the cold-side temperature of the sample are calculated; the thermal coefficient is calculated according to the cold-side temperature and the hot-side temperature; C. when the variation of the thermal coefficient value calculated does not exceed 0.01 within 10 minutes, the thermal coefficient calculated is the thermal coefficient of the sample. The method has the advantages that: firstly, the stability of heat currents is guaranteed; secondly, due to adoption of a heat insulating layer, the errors caused by heat dissipation are reduced; thirdly, when the thermal coefficient is calculated, the thermal losses are modified and the measurement precision is improved.

Description

Technical field: [0001] The invention relates to a device for measuring thermal conductivity, in particular to a device and method for measuring variable thermal conductivity of samples in different temperature ranges for materials whose thermal conductivity is sensitive to temperature changes. Background technique: [0002] Thermal conductivity is an important thermal performance parameter of materials. In the application process of materials, heat transfer is involved in many places. Therefore, the accurate measurement of thermal conductivity has become a very important issue. Since the thermal conductivity of materials is usually the material itself It is a function of temperature, so generally only experimental methods can be used to measure it. There are many methods for measuring thermal conductivity, mainly divided into steady-state method and unsteady-state method. The former mainly includes plate method, and the latter mainly includes hot wire method, hot wire metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N25/18
Inventor 丁建平顾勤姚忠尧刘运春隆有明林惠音
Owner SHANGHAI TIRE & RUBBER TIRE RES INST
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