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System for measuring thermal performance transiently by using pulsing method or constant current method

A technology of constant current method and pulse method, applied in the system field of transient measurement of thermophysical properties by pulse method or constant current method, can solve the problems of high price, unable to meet the needs of social development, time-consuming and high-consumption measurement, etc.

Inactive Publication Date: 2012-07-25
陈昭栋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Measurement is time consuming and expensive
It can only be measured in large laboratories such as China Testing Institute and Metrology Institute, which is far from meeting the needs of social development

Method used

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  • System for measuring thermal performance transiently by using pulsing method or constant current method
  • System for measuring thermal performance transiently by using pulsing method or constant current method
  • System for measuring thermal performance transiently by using pulsing method or constant current method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1 Specimen and measurement arrangement of one-dimensional semi-infinite heat transfer model

[0042] 1.1 The test piece of the one-dimensional semi-infinite heat transfer model

[0043] refer to figure 1 , the test piece is composed of three flat plates of the same material, the main test piece, the auxiliary test piece 1 and the auxiliary test piece 2, whose length and width are both 60-200 mm. The thickness of the main test piece can vary greatly depending on the density of the material to be tested. For most of the materials to be tested, the value can be taken between 2 and 20mm. If the thickness of the main test piece is xmm, the thickness D of auxiliary test piece 1: D≥3xmm; the thickness d of auxiliary test piece 2: d≥2xmm. When the three test pieces are stacked, the contact surface should be smooth and smooth, and the thermal contact should be good.

[0044] 1.2 Measurement arrangement of one-dimensional semi-infinite heat transfer model

[0045] The three ...

Embodiment 2

[0048] Embodiment 2 Transient Automatic Measurement System

[0049] 2.1 Structural block diagram of the transient automatic measurement system

[0050] Structural block diagram of the thermal and physical property transient automatic measuring device of the present invention, as figure 2As shown, it includes an adjustable DC steady-current power supply, a heating measurement device, a temperature acquisition module, and a central processing unit. The adjustable DC steady-current power supply is used to provide power to the heating measurement device and the temperature acquisition module. The heating measurement device is in accordance with Embodiment 1 Part 1.2 of the layout, the temperature acquisition module is used to collect the temperature-time curve of the cold surface and the hot surface, and the central processor is used to obtain the thermal physical properties of the material through calculation and processing according to the temperature-time curve. The relevant d...

Embodiment 3

[0052] 3 pulse method and constant current method

[0053] 3.1 Temperature-time curve of pulse heating measurement

[0054] according to figure 1 Arrange the heating measuring device, when pulse heating, the measured temperature-time curve is as follows image 3 shown. image 3 Middle: Curve 1 is the T(0, t)-t curve of the hot surface; Curve 2 is the T(x, t)-t curve of the cold surface; Curve 3 is the ambient temperature curve. During the short measurement process, the ambient temperature Usually stays the same.

[0055] 3.2 Pulse method and constant current method

[0056] exist image 3 , with the dotted line τ 1 The following measurement data, the method of calculating the thermophysical properties of the material, is called the pulse method; use the dotted line τ 1 The previous measurement data is a method for calculating the thermophysical properties of materials, because the heat flux intensity passing through the contact interface between the planar heat source a...

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Abstract

The invention discloses a system for measuring thermal performance transiently by using a pulsing method or a constant current method, which comprises an adjustable direct-current stabilized current supply, a heating measuring device, a temperature collecting module and a central processing unit, wherein the adjustable direct-current stabilized current supply is used for supplying power to the heating measuring device and the temperature collecting module, the heating measuring device internally comprises a main testing piece (3), an auxiliary testing piece (1) and an auxiliary testing piece (2), the auxiliary testing piece (1) is arranged at the bottom, and a plane heat source is arranged between the main testing piece (3) and the auxiliary testing piece (1). The system can realize fast measurement for the thermal performance of a material by calculating the thermal diffusion coefficient and the heat conductivity of the material to be measured through adopting an exact solution of a one-dimensional semi-infinite heat transfer model and collecting temperature changing data of a heat surface and a cold surface at the right moment. A novel automatic measuring instrument is researched and manufactured for detecting the thermal performances of various solid plates.

Description

technical field [0001] The invention relates to the technical field of measuring thermophysical properties of materials, in particular to a system for transiently measuring thermophysical properties by a pulse method or a constant current method. Background technique [0002] As we all know, the thermal physical properties of materials such as thermal conductivity and thermal diffusivity vary with the material, the structure, density, porosity, electrical conductivity, and moisture content of the material, and some materials are also related to the direction; usually, these Performance is also affected by temperature and pressure. Corresponding to different materials and different experimental conditions, measuring the thermophysical properties of materials is of vital significance in scientific research and engineering technology; thermophysical property measurement is the same as mechanical measurement, electrical measurement, optical measurement, etc. One of the basic me...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 陈昭栋陈丕陈芬
Owner 陈昭栋
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