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Nonlinear fitting method for cooling process of polymeric phase change material

A nonlinear fitting, phase change material technology, applied in the field of polymer phase change materials, to achieve the effect of good fitting accuracy and good fitting effect

Active Publication Date: 2016-01-06
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after research, it is found that although the three-parameter model has a good fitting effect in the cooling process of the phase change material as a whole, there is still a large deviation between the initial cooling stage and the measured temperature value. Based on this, the present invention proposes A "four-parameter" equation was established, and the nonlinear fitting results of the curves showed that this method has better fitting effects in the cooling process of different polymer phase change materials.

Method used

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  • Nonlinear fitting method for cooling process of polymeric phase change material
  • Nonlinear fitting method for cooling process of polymeric phase change material
  • Nonlinear fitting method for cooling process of polymeric phase change material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: the inventive method comprises the following steps:

[0021] (1) Take 2.0g of polypropylene as the sample to be tested, heat the sample to be tested to an initial temperature of 220°C and keep it at this temperature for 15 minutes to ensure that the sample is completely melted, and then quickly transfer the sample to water at a temperature of 25°C At the same time, a T-type thermocouple is inserted into the geometric center area of ​​the molten sample, and the temperature change value of the sample to be tested is collected in real time during the entire cooling process, and the test is repeated 3 times;

[0022] (2) According to the temperature value and time value data collected in step (1), draw a temperature-time change curve, i.e. a "cooling curve";

[0023] (3) Carry out dimensionless processing on the above cooling curve, take dimensionless temperature θ=(T–T 2 ) / (T 1 –T 2 ), where T 1 is the initial cooling temperature, T 2 is the cooling medi...

Embodiment 2

[0026] Embodiment 2: method of the present invention comprises the following steps:

[0027] (1) Take 1.0g of polyethylene as the sample to be tested, heat the sample to be tested to the initial temperature of 210°C and keep it at this temperature for 15 minutes to ensure that the sample is completely melted, and then quickly transfer the sample to water at a temperature of 20°C At the same time, a T-type thermocouple is inserted into the geometric center area of ​​the molten sample, and the temperature change value of the sample to be tested is collected in real time during the entire cooling process, and the test is repeated 4 times;

[0028] (2) According to the temperature value and time value data collected in step (1), draw a temperature-time change curve, i.e. a "cooling curve";

[0029] (3) Carry out dimensionless processing on the above cooling curve, take dimensionless temperature θ=(T–T 2 ) / (T 1 –T 2 ), where T 1 is the initial cooling temperature, T 2 is the c...

Embodiment 3

[0032] Embodiment 3: method of the present invention comprises the following steps:

[0033](1) Take 2.0g of polylactic acid as the sample to be tested, heat the sample to be tested to an initial temperature of 200°C and keep it at this temperature for 15 minutes to ensure that the sample is completely melted, and then quickly transfer the sample to water at a temperature of 30°C At the same time, a T-type thermocouple is inserted into the geometric center area of ​​the molten sample, and the temperature change value of the sample to be tested is collected in real time during the entire cooling process, and the test is repeated 3 times;

[0034] (2) According to the temperature value and time value data collected in step (1), draw a temperature-time change curve, i.e. a "cooling curve";

[0035] (3) Carry out dimensionless processing on the above cooling curve, take dimensionless temperature θ=(T–T 2 ) / (T 1 –T 2 ), where T 1 is the initial cooling temperature, T 2 is the ...

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Abstract

The present invention discloses a nonlinear fitting method for a cooling process of a polymeric phase change material. The method comprises the following steps of: (1) taking the polymeric phase change material as a to-be-tested sample, heating the to-be-tested sample to an initial temperature T1, holding the temperature until the to-be-tested sample is completely melted, then rapidly transferring the to-be-tested sample into a cooling medium of which the temperature is T2, inserting a T-shaped thermocouple into the melted to-be-tested sample at the same time, and acquiring temperature variation values of the to-be-tested sample in the whole cooling process; (2) according to temperature and time data acquired in the step (1), drawing a cooling curve; (3) performing dimensionless processing on the cooling curve, and setting a dimensionless temperature theta to be equal to the value of (T-T2) / (T1-T2); and (4) according to the theta value obtained in the step (3), performing nonlinear fitting by means of the following algorithm: y=(A+B) / (C+ex-D)-B, and making x equal to ln t and y equal to theta, so that a nonlinear fitting parameter in the cooling process of the polymeric phase change material can be obtained. A four-parameter model formula fitting method proposed by the present invention is convenient, has very good fitting effects for different polymeric phase change materials, and is higher in fitting accuracy.

Description

technical field [0001] The invention belongs to the field of polymer phase-change materials, and in particular relates to a nonlinear fitting method for the cooling process of polymer phase-change materials. technical background [0002] Phase change energy storage material (PCM) refers to a class of substances that can automatically absorb or release latent heat from the environment by using the phase state or structure change of the material itself within a certain temperature range, thereby achieving the regulation of the ambient temperature. The specific phase transition process is: when the ambient temperature is higher than the phase transition temperature, the material absorbs and stores heat to lower the ambient temperature; when the ambient temperature is lower than the phase transition temperature, the material releases the stored heat to increase the ambient temperature. For example, in winter, phase change energy storage materials can absorb solar energy during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 杨斌夏茹胡磊钱家盛苗继斌陈鹏郑争志鲁非雪
Owner ANHUI UNIVERSITY
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