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Thermal conductivity coefficient measurement method based on data screening

A technology of thermal conductivity and measurement method, applied in the field of measurement, can solve the problems of difficulty in implementation, limitation of human-computer interaction, complicated calculation process, and complicated operation interface, so as to reduce errors, expand the number of acquisitions, and improve the measurement accuracy.

Inactive Publication Date: 2019-05-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aforementioned data processing methods all improve the accuracy of thermal conductivity to a certain extent, but their common problems are complex calculation process, low calculation efficiency, cumbersome operation interface, and difficult to be widely used.
In view of this, there are certain limitations in terms of implementation difficulty and human-computer interaction.

Method used

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  • Thermal conductivity coefficient measurement method based on data screening
  • Thermal conductivity coefficient measurement method based on data screening
  • Thermal conductivity coefficient measurement method based on data screening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for measuring thermal conductivity based on data screening, the measurement method steps comprising:

[0031] (1) Data detection preparation: put ethylene glycol with a concentration greater than 99% in a constant temperature water tank at 20°C, and use a stainless steel probe. The parameters of the stainless steel probe are: length 167mm, diameter 2mm, aspect ratio 83.5, at 2V / 0.38A DC regulated power supply for temperature detection;

[0032] (2) Experimental data collection: use the temperature data collection instrument UT325 to collect temperature data, the collection interval is 1s, the detection lasts 200s, three sets of data are measured, and each set of experiments is repeated three times;

[0033] (3) Data grouping fitting: let y i =T i -T i-1 , The experimental data can be divided into n (n=200) measured values ​​(x i ,y i ), (i=1~n) has drawn the curve graph of time logarithm-temperature, obtained fitting model by following formula:

[0034...

Embodiment 2

[0051] A method for measuring thermal conductivity based on data screening, the measurement method steps comprising:

[0052] (1) Data detection preparation: put ethylene glycol with a concentration greater than 99% in a constant temperature water tank at 20°C, and use a stainless steel probe. The parameters of the stainless steel probe are: length 167mm, diameter 2mm, aspect ratio 83.5, at 2V / 0.38A DC regulated power supply for temperature detection;

[0053] (2) Experimental data collection: use the temperature data collection instrument UT325 to collect temperature data, the collection interval is 2s, the detection lasts for 400s, three sets of data are measured, and each set of experiments is repeated three times;

[0054] (3) Data grouping fitting: let y i =T i -T i-1 , The experimental data can be divided into n (n=200) measured values ​​(x i ,y i ), (i=1~n) has drawn the curve graph of time logarithm-temperature, obtained fitting model by following formula:

[...

Embodiment 3

[0072] A method for measuring thermal conductivity based on data screening, the measurement method steps comprising:

[0073] (1) Data detection preparation: put ethylene glycol with a concentration greater than 99% in a constant temperature water tank at 20°C, and use a stainless steel probe. The parameters of the stainless steel probe are: length 167mm, diameter 2mm, aspect ratio 83.5, at 2V / 0.38A DC regulated power supply for temperature detection;

[0074] (2) Experimental data collection: use a temperature data collector to collect temperature data, the collection interval is 3s, the detection lasts for 600s, three sets of data are measured, and each set of experiments is repeated three times;

[0075] (3) Data grouping fitting: let y i =T i -T i-1 , The experimental data can be divided into n (n=200) measured values ​​(x i ,y i ), (i=1~n) has drawn the curve graph of time logarithm-temperature, obtained fitting model by following formula:

[0076] the y i =b+ax...

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Abstract

The invention discloses a thermal conductivity coefficient measurement method based on data screening. The measurement method comprises data detection preparation, experimental data acquisition, datagrouping fitting, parameter solution, cyclic data screening and thermal conductivity coefficient solving. According to a method for measuring a thermal conductivity coefficient by automatically screening data by utilization of a least square method, ethylene glycol is measured; a result shows that: the relative error of the thermal conductivity coefficient obtained by direct linear fitting is 4.1%; the relative error of the thermal conductivity coefficient obtained by linear fitting after data screening is 0.5%; by means of the method, the subjective error of a measurer is reduced; and the measurement precision of the thermal conductivity coefficient is increased.

Description

technical field [0001] The invention relates to the field of measurement methods, in particular to a method for measuring thermal conductivity based on data screening. Background technique [0002] Thermal conductivity is a thermophysical parameter that characterizes the thermal conductivity of a substance. As a basic thermophysical parameter of a substance, it is widely used in production, scientific research and daily life. At present, the measurement methods of thermal conductivity are divided into two categories: steady-state method and unsteady-state method. The unsteady-state method has become the main method for obtaining thermal conductivity due to its advantages of short time, high precision and wide measuring range. The thermal probe method has become the main measurement method of the unsteady method due to its advantages of simple fabrication, short measurement time, and convenient use. It has been widely used in the measurement of thermal conductivity of liquid...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N25/18
Inventor 晋华桂金鹏任焕莲周林康李雪洁郭毅
Owner TAIYUAN UNIV OF TECH
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