CN113390915A - Method for testing supercooling behavior stability of phase change energy storage material - Google Patents
Method for testing supercooling behavior stability of phase change energy storage material Download PDFInfo
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- 238000004781 supercooling Methods 0.000 title claims abstract description 213
- 238000004146 energy storage Methods 0.000 title claims abstract description 138
- 239000011232 storage material Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 103
- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000002425 crystallisation Methods 0.000 claims abstract description 32
- 230000008025 crystallization Effects 0.000 claims abstract description 29
- 238000010998 test method Methods 0.000 claims abstract description 9
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000012071 phase Substances 0.000 abstract description 112
- 239000000463 material Substances 0.000 abstract description 16
- 239000007791 liquid phase Substances 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 10
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 3
- 101100496858 Mus musculus Colec12 gene Proteins 0.000 description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 description 3
- 229910001631 strontium chloride Inorganic materials 0.000 description 3
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 239000002562 thickening agent Substances 0.000 description 1
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Abstract
本发明提供了一种相变储能材料体系过冷行为稳定性的测试方法，其包括：将待测的相变储能材料体系进行吸热熔融‑放热结晶的多次循环过程，并调控其在熔融状态下停留不同的若干预定时间，利用T‑history法测试相变储能材料体系的过冷度，获得材料体系的第一过冷度和第二过冷度；基于第一过冷度和第二过冷度与预设的过冷度阈值和差值阈值的比较，对所述相变储能材料体系过冷行为稳定性进行评判；所述测试方法还可根据实际情况利用DSC法测试相变储能材料体系的过冷度。该测试方法考虑了相变储能材料在液相的停留时间对其过冷行为造成的影响，提高了相变储能材料过冷行为稳定性评估的准确性，具有重要的工程意义和应用前景。
The invention provides a method for testing the stability of supercooling behavior of a phase change energy storage material system, which comprises: subjecting the phase change energy storage material system to be tested for multiple cycles of endothermic melting-exothermic crystallization, and regulating It stays in the molten state for several predetermined times, and the T-history method is used to test the degree of subcooling of the phase change energy storage material system to obtain the first degree of subcooling and the second degree of subcooling of the material system; based on the first degree of subcooling The comparison of the supercooling degree and the second supercooling degree with the preset supercooling degree threshold and the difference threshold, to judge the stability of the supercooling behavior of the phase change energy storage material system; the test method can also use DSC according to the actual situation method to test the supercooling degree of phase change energy storage material system. The test method takes into account the influence of the residence time of phase change energy storage materials in the liquid phase on their supercooling behavior, which improves the accuracy of the evaluation of the stability of the supercooling behavior of phase change energy storage materials, and has important engineering significance and application prospects. .
Description
Technical Field
The invention belongs to the field of phase change energy storage materials, and particularly relates to a method for testing the stability of supercooling behavior of a phase change energy storage material system.
Background
At present, the supercooling behavior test of the phase change energy storage material of a hydrated salt system is mainly realized by carrying out single or multiple supercooling degree measurements, and the influence of the retention time of the material in a liquid phase (higher than the phase change temperature) on the supercooling behavior is seldom concerned. When the material is modified by the thickener (such as improving the circulation stability), the supercooling behavior of the material is influenced by the residence time of the material in the liquid phase, but in practical application, the residence time of the material in the liquid phase cannot be determined due to the influence of the environment, and the uncertainty of the residence time of the material in the liquid phase influences the accuracy of the evaluation of the supercooling behavior stability of the material.
Therefore, it is essential for the material to have a stability that characterizes its supercooling behavior in the case of different residence times in the liquid phase.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for testing the supercooling behavior stability of a phase change energy storage material system, which judges the supercooling behavior stability of the material system by regulating and controlling the influence of different residence time of the phase change energy storage material system in a molten state on the supercooling degree of the material system.
In order to achieve the above object, the present invention provides a method for testing the stability of supercooling behavior of a phase change energy storage material system, which comprises:
s10, performing a multi-cycle process of endothermic melting-exothermic crystallization on the phase change energy storage material system to be tested, and controlling the phase change energy storage material system to stay for a plurality of different first preset times in a melting state in the multi-cycle process, wherein the plurality of first preset times comprise a first stay time and a second stay time, and the second stay time is more than 3 hours longer than the first stay time;
s20, testing the supercooling degree of the phase change energy storage material system by using a T-history method at least in the circulation process that the phase change energy storage material system stays in the molten state for the first staying time and the second staying time, and obtaining a first supercooling degree corresponding to the first staying time and a second supercooling degree corresponding to the second staying time;
s30, judging the supercooling behavior stability of the phase change energy storage material system based on the comparison between the first supercooling degree and the second supercooling degree and the preset supercooling degree threshold value and the difference value threshold value.
Preferably, the judging the supercooling behavior stability of the phase change energy storage material system based on the comparison between the first supercooling degree and the second supercooling degree and the preset supercooling degree threshold value and the difference value threshold value comprises:
if the first supercooling degree and the second supercooling degree are not larger than the supercooling degree threshold value, judging that the supercooling behavior of the phase change energy storage material system is stably inhibited;
(II) judging that the supercooling behavior of the phase change energy storage material system is inhibited to a certain degree if at least one of the first supercooling degree and the second supercooling degree is greater than the supercooling degree threshold value and the difference value between the first supercooling degree and the second supercooling degree is not greater than the difference value threshold value;
and (III) judging that the supercooling behavior of the phase change energy storage material system is unstable if at least one of the first supercooling degree and the second supercooling degree is greater than the supercooling degree threshold value and the difference value between the first supercooling degree and the second supercooling degree is greater than the difference value threshold value.
Preferably, the first residence time is 2 to 3 hours, and the second residence time is 6 to 10 hours.
Further preferably, the rest of the first predetermined times except the first stay time and the second stay time are all smaller than the first stay time.
Preferably, the supercooling degree threshold value is 1.2-1.5 ℃, and the difference threshold value is 4-6 ℃.
Further preferably, the supercooling degree threshold value is 1.5 ℃, and the difference threshold value is 5 ℃.
Preferably, when the supercooling behavior of the phase change energy storage material system is determined to be unstable, the test method further comprises:
s40, performing a multi-cycle process of endothermic melting-exothermic crystallization on the phase change energy storage material system, controlling the phase change energy storage material system to stay at a melting state for a plurality of different second preset times in the multi-cycle process, testing the supercooling degree of the phase change energy storage material system by using a DSC method, and finally judging the supercooling behavior stability of the phase change energy storage material system according to the testing result of the DSC method, wherein the multi-cycle process comprises the following steps:
if the test result according to the DSC method shows that the supercooling behavior of the phase change energy storage material system is unstable, finally judging that the supercooling behavior of the phase change energy storage material system is unstable;
if the test result according to the DSC method shows that the supercooling behavior of the phase change energy storage material system is stable, the supercooling behavior of the phase change energy storage material system cannot be judged to be unstable, and the test process of the steps S10-S30 needs to be performed again.
Further preferably, the second predetermined time is 0.1min to 30 min.
According to the method for testing the supercooling behavior stability of the phase change energy storage material system, the T-history test method and the DSC test method are combined, so that the influence of different staying time of the phase change energy storage material system in a molten state on the supercooling degree of the material system is regulated and controlled, and the supercooling behavior stability of the material system is further judged. The testing method considers the influence of the retention time of the phase change energy storage material in the liquid phase on the supercooling behavior of the phase change energy storage material, improves the accuracy of evaluating the supercooling behavior stability of the phase change energy storage material, and has important engineering significance and application prospect.
Drawings
FIG. 1 is a flow chart of a method for testing the supercooling behavior stability of a phase change energy storage material system in an embodiment of the invention;
FIG. 2 is a flowchart of a method for testing the supercooling behavior stability of a phase change energy storage material system according to an embodiment of the present invention;
FIG. 3 is a cooling curve of a phase change energy storage material system in example 1 of the present invention;
FIG. 4 is a distribution diagram of supercooling degree with cycle number of a phase change energy storage material system in 100 melting-crystallization cycles in example 1 of the present invention;
FIG. 5 is a cooling curve of a phase change energy storage material system in example 2 of the present invention;
FIG. 6 is a cooling curve of a phase change energy storage material system in example 3 of the present invention;
FIG. 7 is a DSC chart of the phase change energy storage material system in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
The embodiment of the invention provides a method for testing the supercooling behavior stability of a phase change energy storage material system, and with reference to fig. 1, the method comprises the following steps:
and S10, performing multiple circulation processes of heat absorption melting and heat release crystallization on the phase change energy storage material system to be tested, and controlling the phase change energy storage material system to stay for different first preset times in a melting state in the multiple circulation processes.
Preferably, the number of first predetermined times includes a first dwell time and a second dwell time.
Further preferably, the second residence time is greater than the first residence time by 3 hours or more.
Preferably, the first residence time is 2 to 3 hours, and the second residence time is 6 to 10 hours.
Further preferably, the rest of the first predetermined times, except the first residence time and the second residence time, are all smaller than the first residence time, such as 30min, 1h or 1.5 h.
And step S20, testing the supercooling degree of the phase change energy storage material system by using a T-history method at least in the circulation process of the phase change energy storage material system staying in the molten state for the first staying time and the second staying time, and obtaining a first supercooling degree corresponding to the first staying time and a second supercooling degree corresponding to the second staying time.
And step S30, judging the supercooling behavior stability of the phase change energy storage material system based on the comparison between the first supercooling degree and the second supercooling degree and the preset supercooling degree threshold value and the difference value threshold value.
Preferably, the supercooling degree threshold value is 1.2-1.5 ℃, and the difference threshold value is 4-6 ℃.
Further preferably, the supercooling degree threshold value is 1.5 ℃, and the difference threshold value is 5 ℃.
Wherein the judging the supercooling behavior stability of the phase change energy storage material system based on the comparison between the first supercooling degree and the second supercooling degree and the preset supercooling degree threshold value and the difference threshold value comprises:
if the first supercooling degree and the second supercooling degree are not larger than the supercooling degree threshold value, judging that the supercooling behavior of the phase change energy storage material system is stably inhibited;
(II) judging that the supercooling behavior of the phase change energy storage material system is inhibited to a certain degree if at least one of the first supercooling degree and the second supercooling degree is greater than the supercooling degree threshold value and the difference value between the first supercooling degree and the second supercooling degree is not greater than the difference value threshold value;
and (III) judging that the supercooling behavior of the phase change energy storage material system is unstable if at least one of the first supercooling degree and the second supercooling degree is greater than the supercooling degree threshold value and the difference value between the first supercooling degree and the second supercooling degree is greater than the difference value threshold value.
In a further preferred aspect, referring to fig. 2, when the supercooling behavior of the phase change energy storage material system is determined to be unstable, the testing method further comprises:
and S40, performing multiple circulation processes of endothermic melting-exothermic crystallization on the phase change energy storage material system, controlling the phase change energy storage material system to stay for a plurality of different second preset times in a melting state in the multiple circulation processes, testing the supercooling degree of the phase change energy storage material system by using a DSC method, and finally judging the supercooling behavior stability of the phase change energy storage material system according to the testing result of the DSC method.
The final judgment of the supercooling behavior stability of the phase change energy storage material system according to the test result of the DSC method comprises the following steps:
if the test result according to the DSC method shows that the supercooling behavior of the phase change energy storage material system is unstable, finally judging that the supercooling behavior of the phase change energy storage material system is unstable;
if the test result according to the DSC method shows that the supercooling behavior of the phase change energy storage material system is stable, the supercooling behavior of the phase change energy storage material system cannot be judged to be unstable, and the test process of the steps S10-S30 needs to be performed again.
The supercooling behavior of the phase change energy storage material system is judged to be stable according to a DSC method for testing a supercooling degree result and a crystallization exothermic peak of the phase change energy storage material system:
(1) judging that the supercooling behavior of the phase change energy storage material system is stable: at least 4 residence time intervals which are uniformly distributed in the time scale are taken within the time scale of 0.1-60 min, and the supercooling behavior of the system is judged to be stable if the supercooling degree is relatively stable (the change is within 5 ℃ and no obvious continuous increase or continuous decrease trend exists) and the temperature span change of the crystallization exothermic peak is smaller than 1.5 ℃ and no obvious rule that the temperature span change is increased first and then is reduced to a balance value is determined according to whether the supercooling degree and the temperature span of the crystallization exothermic peak obtained by the test regularly change along with the delay of the residence time.
(2) And judging that the supercooling behavior of the phase change energy storage material system is unstable: at least 4 residence time intervals which are uniformly distributed in the time scale are taken within the time scale of 0.1-60 min, and according to the supercooling degree obtained by testing and whether the temperature span of the crystallization exothermic peak changes regularly along with the delay of the residence time, if the supercooling degree changes more than 5 ℃, the supercooling degree changes obviously and continuously, and meanwhile, the temperature span change of the crystallization exothermic peak is more than 1.5 ℃, and the law that the temperature span changes to an equilibrium value after increasing first is obvious, the supercooling behavior of the system is judged to be easily influenced by the non-uniform local supercooling degree and show unstable supercooling behavior.
Since the sample measured by the DSC method is only a few milligrams, while the sample measured by the T-history method is usually tens or hundreds of grams, the results obtained by the DSC method and the T-history method may be inconsistent, and the results measured by the T-history method are usually based on the results of the T-history method because the sample measured by the T-history method is higher in amount. However, when the results obtained by the DSC method and the T-history method are inconsistent, whether the results interfere with the T-history method due to other factors is also considered, and therefore, when the results of the DSC method and the T-history method are inconsistent, the T-history method testing procedures of the steps S10-S30 need to be performed again.
Preferably, the second predetermined time is 0.1min to 30 min.
The method for testing the stability of the supercooling behavior of the phase change energy storage material system will be described with reference to specific examples, which are understood by those skilled in the art to be specific examples of the method for testing the stability of the supercooling behavior of the phase change energy storage material system, and are not intended to limit the entirety of the method.
Example 1: EPCM + 0.5% SrCl2·6H2Evaluation of supercooling behavior stability of O + 0.5% HEC
Step one, EPCM + 0.5% SrCl to be detected2·6H2And (2) carrying out multiple circulation processes of endothermic melting-exothermic crystallization on an O + 0.5% HEC phase change energy storage material system, wherein EPCM: 43% MgCl2+ 57% Mg (NO)3)2-6H2O, HEC: hydroxyethyl cellulose; and controlling the phase change energy storage material system to stay in a molten state for different first preset times in the multi-cycle process, wherein the first preset times comprise 2h and 8 h.
Step two, circularly testing the supercooling degree of the phase change energy storage material system in a circulating process corresponding to different first preset times for 100 times in a molten state by utilizing a T-history method; the supercooling degree of the phase change energy storage material system in the molten state when the phase change energy storage material system stays for 2 hours and 8 hours is measured respectively by randomly selecting one or more times in the test process, and the stay preset time corresponding to the rest of the test processes is less than 2 hours and can be randomly selected according to actual needs; then, the maximum values of the measurement results corresponding to 2h and 8h are taken as the first supercooling degree and the second supercooling degree, respectively.
Fig. 3 is a cooling curve diagram of the phase change energy storage material system, and it can be known from fig. 3 that the first supercooling degree of the phase change energy storage material is 0.2 ℃ and the second supercooling degree is 0.6 ℃.
And step three, based on the obtained first supercooling degree of 0.2 ℃ and the second supercooling degree of 0.6 ℃, therefore, the first supercooling degree and the second supercooling degree are not more than 1.5 ℃. In addition, fig. 4 is a distribution diagram of the supercooling degree of the phase change energy storage material system with the number of cycles in 100 melting-crystallization cycles, and it can be known from fig. 4 that the supercooling degree of the phase change energy storage material system is less than 1.5 ℃ in 100 melting-crystallization cycles; therefore, the supercooling behavior of the phase change energy storage material system is stably inhibited.
Example 2: EPCM + 0.5% SrCl2·6H2Evaluation of supercooling behavior stability of O + 1.0% HEC
Step one, EPCM + 0.5% SrCl to be detected2·6H2And (2) carrying out multiple circulation processes of endothermic melting-exothermic crystallization on an O + 1.0% HEC phase change energy storage material system, wherein EPCM: 43% MgCl2+ 57% Mg (NO)3)2-6H2O, HEC: hydroxyethyl cellulose; and controlling the phase change energy storage material system to stay in a molten state for different first preset times in the multi-cycle process, wherein the first preset times comprise 2h and 8 h.
Testing the supercooling degree of the phase change energy storage material system in the circulation process corresponding to different first preset times for 50 times of stay in the molten state by utilizing a T-history method; the supercooling degree of the phase change energy storage material system in the molten state when the phase change energy storage material system stays for 2 hours and 8 hours is measured respectively by randomly selecting one time or a plurality of times in the test process, and the corresponding stay preset time in the rest test processes is less than 2 hours and can be randomly selected according to actual needs; then, the maximum values of the measurement results corresponding to 2h and 8h are taken as the first supercooling degree and the second supercooling degree, respectively.
Fig. 5 is a cooling curve diagram of the phase change energy storage material system, and as can be seen from fig. 5, the first supercooling degree of the phase change energy storage material is 0.9 ℃, and the second supercooling degree is 1.7 ℃.
And step three, based on the obtained first supercooling degree of 0.9 ℃ and the second supercooling degree of 1.7 ℃, the second supercooling degree is more than 1.5 ℃, and the difference value between the first supercooling degree and the second supercooling degree is 0.6 ℃ and is not more than 5 ℃. Therefore, the supercooling behavior of the phase change energy storage material system is determined to be inhibited to a certain degree, and whether the supercooling degree of the phase change energy storage material system needs to be tested by using a DSC method or not can be determined according to actual conditions.
Example 3: EPCM + 0.5% SrCl2·6H2Evaluation of supercooling behavior stability of O + 1.5% HEC
Step one, EPCM + 0.5% SrCl to be detected2·6H2And (2) carrying out a multi-cycle process of endothermic melting-exothermic crystallization on an O + 1.5% HEC phase change energy storage material system, wherein EPCM: 43% MgCl2+ 57% Mg (NO)3)2-6H2O, HEC: hydroxyethyl cellulose; and controlling the phase change energy storage material system to stay in a molten state for different first preset times in the multi-cycle process, wherein the first preset times comprise 2h and 8 h.
Testing the supercooling degree of the phase change energy storage material system in the circulation process corresponding to different first preset times for 50 times of stay in the molten state by utilizing a T-history method; the supercooling degree of the phase change energy storage material system in the molten state when the phase change energy storage material system stays for 2 hours and 8 hours is measured respectively by randomly selecting one time or a plurality of times in the test process, and the stay preset time corresponding to the rest tests is less than 2 hours and can be randomly selected according to actual needs; then, the maximum values of the measurement results corresponding to 2h and 8h are taken as the first supercooling degree and the second supercooling degree, respectively.
Fig. 6 is a cooling curve diagram of the phase change energy storage material system, and as can be seen from fig. 6, the first supercooling degree of the phase change energy storage material is 3.8 ℃, and the second supercooling degree is 9.5 ℃.
Step three, based on the obtained first supercooling degree of 3.8 ℃ and the second supercooling degree of 9.5 ℃, therefore, the first supercooling degree and the second supercooling degree are both more than 1.5 ℃; and the difference value between the first supercooling degree and the second supercooling degree is 5.7 ℃ and is more than 5 ℃. It is determined that the supercooling behavior of the phase change energy storage material system is unstable.
And step four, performing multiple circulation processes of endothermic melting-exothermic crystallization on the phase change energy storage material system, controlling the phase change energy storage material system to stay at a melting state of 80 ℃ for a plurality of different second preset times (0.1min, 1min, 5min, 10min and 30min) in the multiple circulation processes, and testing the supercooling degree of the phase change energy storage material system by using a DSC method.
Because the quality magnitudes of samples tested by the T-history method and the DSC method are different, the scales of the retention time are different, the fluctuation can be reflected only by more than a plurality of hours when the T-history method is used for testing, and the difference can be reflected when the DSC method is used for testing.
FIG. 7 is a DSC curve of the phase change energy storage material system, and the crystallization temperature is 60 ℃. When the mixture stays for 0.1min in a molten state, the initial crystallization temperature is 49.09 ℃, the corresponding supercooling degree is 10.91 ℃, and the span of a crystallization exothermic peak is 14.03 ℃; when the mixture stays for 1min in a molten state, the initial crystallization temperature is 46.81 ℃, the corresponding supercooling degree is 13.19 ℃, and the span of a crystallization exothermic peak is 15.87 ℃; when the mixture stays for 5min in a molten state, the initial crystallization temperature is 48.01 ℃, the corresponding supercooling degree is 11.99 ℃, and the span of a crystallization exothermic peak is 15.73 ℃; when the mixture stays for 10min in a molten state, the initial crystallization temperature is 34.81 ℃, the corresponding supercooling degree is 25.19 ℃, and the span of a crystallization exothermic peak is 12.00 ℃; when the mixture stays for 30min in a molten state, the initial crystallization temperature is 35.69 ℃, the corresponding supercooling degree is 24.31 ℃, and the span of the exothermic peak of crystallization is 11.93 ℃.
As can be seen from fig. 7, in this embodiment, the supercooling degree of the phase change energy storage material system is tested based on the DSC method, and as the delay (increase) of the retention time, the supercooling degree changes by more than 5 ℃, and the supercooling degree has a continuous increasing trend, and meanwhile, the temperature span change of the crystallization exothermic peak is more than 1.5 ℃, and there is an obvious rule that the temperature span change increases first and then decreases to the equilibrium value, so that it is determined that the supercooling behavior of the phase change energy storage material system is unstable.
In summary, the test results of the T-history method and the DSC method both show that the supercooling behavior of the phase change energy storage material system is unstable, and finally it can be determined that the supercooling behavior of the phase change energy storage material system is unstable, and the supercooling behavior is greatly affected by the different residence times in the molten state, and further optimization of the supercooling behavior is required to achieve the purpose of "stably realizing suppression of supercooling degree".
If the supercooling degree difference obtained by the T-history method is large, but the exothermic peak broadening of the crystallization peak in the test result obtained by the DSC method is not obvious, it can be shown that the supercooling degree difference obtained by the T-history method is not caused by the heterogeneity of the local supercooling degree, but is caused by other reasons such as external interference, and at this time, it cannot be determined that the supercooling behavior of the phase change energy storage material system is unstable, and the T-history method test experiment needs to be performed again to determine the result.
According to the method for testing the supercooling behavior stability of the phase change energy storage material system, the supercooling degree of the material system is tested by combining the T-history method and the DSC method through regulating and controlling different residence times of the phase change energy storage material system in the molten state, so that the influence of the different residence times in the molten state on the supercooling degree of the material system is obtained, and the supercooling behavior stability of the material system is further judged. The testing method considers the influence of the retention time of the phase change energy storage material in the liquid phase on the supercooling behavior of the phase change energy storage material, improves the accuracy of evaluating the supercooling behavior stability of the phase change energy storage material, and has important engineering significance and application prospect.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
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