CN110455668A - A kind of measuring method of phase-change material durability - Google Patents
A kind of measuring method of phase-change material durability Download PDFInfo
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- CN110455668A CN110455668A CN201910777936.8A CN201910777936A CN110455668A CN 110455668 A CN110455668 A CN 110455668A CN 201910777936 A CN201910777936 A CN 201910777936A CN 110455668 A CN110455668 A CN 110455668A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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Abstract
The present invention provides a kind of measuring method of phase-change material durability, belongs to phase-change material technical field.It include: to take quality for m1, enthalpy of phase change be △ H1Phase-change material sample, be put into vial, clog vial to be put into thermostatic drying chamber after bottleneck and carry out thermal cycle, be subsequently cooled to 0 DEG C of progress SAPMAC method, complete a cyclic process, including a heating fusing thermal cycle and a cooling solidification SAPMAC method；Above-mentioned hot SAPMAC method is continuously repeated into progress i times, the quality m of sample is measured after circulationi, mass loss rate is calculated, the sample after separately taking a small amount of circulation does differential scanning test, obtains enthalpy of phase change △ Hi；Mass loss rate and enthalpy of phase change change rate are bigger, illustrate that the durability of phase-change material sample is poorer.The present invention measures the durability of phase-change material by the way of Frozen-thawed cycled, and amount of samples is small, high reliablity, has being widely popularized property.
Description
Technical field
The invention belongs to phase-change material technical field, specially a kind of measuring method of phase-change material durability.
Background technique
In heat-storage technology, using phase-change material as medium, the latent heat heat-storage technology of thermal energy is stored using its latent heat of phase change,
It has broad application prospects in many fields.Phase-change material, which refers to, to be varied with temperature and changes form and can provide the object of latent heat
Matter.Phase-change material is become liquid or is become solid process from liquid to be known as phase transition process from solid-state, and at this moment phase-change material will be inhaled
Receive or discharge a large amount of latent heat.When environment temperature increases, the chemical bond of phase-change material is disconnected, and substance becomes liquid from solid-state
(endothermic process), while amount of heat is absorbed, when environment temperature decline, phase-change material is changed into solid-state again, and releases elder generation
The heat of preceding absorption, this circulation preferably balance room temperature.
Thermal stability is the important indicator for examining phase-change material service performance, it is directly related to phase-change material service life
With accumulation of heat system reliability, especially organic phase change material, in actual application, the problem of aging of inevitable material.
Organic phase change material is subjected to the effects of oxidation that can occur when high temperature melting-low temperature solidification recycles many times, decomposition, volatilization, produces
Raw certain mass loss, so that the storage exothermal effect of phase-change material is influenced, therefore, for such phase-change material, it is ensured that
Its Long-Term Properties not only needs its operating ambient temperature range of strict control, it is often more important that composite phase-change material sheet
The durable Journal of Sex Research of body.
Summary of the invention
The purpose of the present invention is to provide a kind of measuring methods of phase-change material durability, using the side using Frozen-thawed cycled
Formula measures the durability of phase-change material, and amount of samples is small, high reliablity, has being widely popularized property.
The object of the invention is achieved through the following technical solutions:
A kind of measuring method of phase-change material durability, comprising the following steps:
Taking quality is m1, enthalpy of phase change be △ H1Phase-change material sample, be put into vial, clog vial after bottleneck
It is put into thermostatic drying chamber and carries out thermal cycle, be subsequently cooled to 0 DEG C of progress SAPMAC method, complete a cyclic process, including one
Heating fusing thermal cycle and a cooling solidification SAPMAC method；
Above-mentioned hot SAPMAC method is continuously repeated into progress i times, the quality m of sample is measured after circulationi, mass loss rate is calculated,
Sample after separately taking a small amount of circulation does differential scanning test, obtains enthalpy of phase change △ Hi；
Mass loss rate and enthalpy of phase change change rate are bigger, illustrate that the durability of phase-change material sample is poorer.
Further, the set temperature of the thermostatic drying chamber is greater than or equal to phase transition temperature.
Further, the thermostatic drying chamber, which carries out thermal cycle, should ensure that phase-change material melts, and complete exothermic process.
Further, the mass loss rate=(mi-m1)/m1× 100%.
Further, the enthalpy of phase change change rate=(△ Hi-△H1)/△H1× 100%.
Further, when the mass loss rate and enthalpy of phase change change rate are lower than 5%, the durability of phase-change material sample is got over
It is good.Core material content is higher in phase-change material, and the mass loss after cold cycling is bigger, and enthalpy of phase change loss also increases, thermoregulation effect
It is poorer.Core material content is higher in composite phase-change material, and after n times cold cycling, core material is more easy to appear leakage without being wrapped
It is rolled in phase transformation wall material hole.In conjunction with data are widely applied, mass loss rate is lower, and enthalpy of phase change change rate is lower, phase-change material
Durability it is better, be set as not less than 5%.
Compared with prior art, the invention has the following advantages:
Mass loss rate is that the mass change of phase-change material in the long-term use is measured in terms of quality；Phase transformation enthalpy change
Rate is the release measured in terms of heat phase-change material in the long-term use or absorbs heat, so that reflection is to ring around
The regulating power of border temperature.The present invention integrated in terms of mass loss and phase transformation enthalpy change two to the durability of phase-change material into
Row measurement, mass loss rate is bigger, and enthalpy of phase change change rate is bigger, illustrates that quality and heat decay are faster, durability is poorer, uses
The time limit is shorter.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1
Take quality m1For 0.5235g, enthalpy of phase change △ H1For the phase-change material sample of 60.57J/g, it is put into vial, clogs
Vial is put into thermostatic drying chamber after bottleneck and carries out thermal cycle, the phase transition temperature of phase-change material sample is 38 ± 2 DEG C, it is ensured that
Phase transformation core material (paraffin) all melts, the temperature 50 C of thermostatic drying chamber, and drying time 1.5 hours, it is cooling to be then placed in refrigerator
To 0 DEG C of progress SAPMAC method, a cyclic process, including a heating fusing thermal cycle and a cooling solidification SAPMAC method are completed；
Above-mentioned hot SAPMAC method is continuously repeated into progress 300 times, the quality m of sample is measured after circulation300For 0.5146g, calculate
Mass loss rate is -1.70%, and the sample after separately taking a small amount of circulation does differential scanning test, obtains enthalpy of phase change △ H300For
58.4156J/g, phase transformation enthalpy change are -2.1544J/g, change rate 3.56%；
The present embodiment sample is under 300 Frozen-thawed cycleds, and mass loss rate and enthalpy of phase change change rate are respectively less than 5%, explanation
The durability of sample is good.
Embodiment 2
Take quality m1For 0.5503g, enthalpy of phase change △ H1It for the phase-change material sample of 45.7486J/g, is put into vial, fills in
Firmly vial is put into thermostatic drying chamber after bottleneck and carries out thermal cycle, phase-change material sample phase transition temperature is 38 ± 2 DEG C, it is ensured that
Phase transformation core material (paraffin) all melts, the temperature 50 C of thermostatic drying chamber, and drying time 1.5 hours, it is cooling to be then placed in refrigerator
To 0 DEG C of progress SAPMAC method, a cyclic process, including a heating fusing thermal cycle and a cooling solidification SAPMAC method are completed；
Above-mentioned hot SAPMAC method is continuously repeated into progress 250 times, the quality m of sample is measured after circulation250For 0.5426g, calculate
Mass loss rate is -1.4%, and the sample after separately taking a small amount of circulation does differential scanning test, obtains enthalpy of phase change △ H250For
46.00J/g, phase transformation enthalpy change are+0.2514J/g, and change rate is+0.55%；
The present embodiment sample is under 250 Frozen-thawed cycleds, Mass lost, and enthalpy of phase change increases, but mass loss rate and phase transformation
Enthalpy change rate is respectively less than 5%, illustrates that the durability of the sample is good.
Embodiment 3
Take quality m1For 0.5125g, enthalpy of phase change △ H1For the phase-change material sample of 62.8J/g, it is put into vial, clogs
Vial is put into thermostatic drying chamber after bottleneck and carries out thermal cycle, phase-change material sample phase transition temperature is 38 ± 2 DEG C, it is ensured that phase
Become core material all to melt, the temperature 50 C of thermostatic drying chamber drying time 1.5 hours, is then placed in refrigerator and is cooled to 0 DEG C of progress
SAPMAC method completes a cyclic process, including a heating fusing thermal cycle and a cooling solidification SAPMAC method；
Above-mentioned hot SAPMAC method is continuously repeated into progress 350 times, the quality m of sample is measured after circulation350For 0.3762g, calculate
Mass loss rate is -26.6%, and the sample after separately taking a small amount of circulation does differential scanning test, obtains enthalpy of phase change △ H350For
67.04J/g, phase transformation enthalpy change are+4.24J/g, change rate 6.75%；
The present embodiment sample is under 350 Frozen-thawed cycleds, and mass loss rate and enthalpy of phase change change rate are all larger than 5%, explanation
The durability of the sample is poor.
It measures obtained phase-change material Durability results to embodiment 1 to 3 using the prior art to verify, durability
It can match with 1 to 3 measurement result of embodiment, illustrate that the application phase-change material durability measurement mode can be accurately to phase transformation material
Material durability is measured.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of measuring method of phase-change material durability, which comprises the following steps:
Taking quality is m1, enthalpy of phase change be △ H1Phase-change material sample, be put into vial, be put into vial after clogging bottleneck
Thermal cycle is carried out in thermostatic drying chamber, is subsequently cooled to 0 DEG C of progress SAPMAC method, completes a cyclic process, including a heating
Melt thermal cycle and a cooling solidification SAPMAC method；
Above-mentioned hot SAPMAC method is continuously repeated into progress i times, the quality m of sample is measured after circulationi, mass loss rate is calculated, is separately taken few
Sample after amount circulation does differential scanning test, obtains enthalpy of phase change △ Hi；
Mass loss rate and enthalpy of phase change change rate are bigger, illustrate that the durability of phase-change material sample is poorer.
2. a kind of measuring method of phase-change material durability as described in claim 1, which is characterized in that the thermostatic drying chamber
Set temperature is greater than or equal to phase transition temperature.
3. a kind of measuring method of phase-change material durability as described in claim 1, which is characterized in that the thermostatic drying chamber into
Row thermal cycle should ensure that phase-change material melts, and complete exothermic process.
4. a kind of measuring method of phase-change material durability as described in claim 1, which is characterized in that the mass loss rate=
(mi-m1)/m1× 100%.
5. a kind of measuring method of phase-change material durability as described in claim 1, which is characterized in that the enthalpy of phase change change rate
=(△ Hi-△H1)/△H1× 100%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650073B (en) * | 2020-06-15 | 2024-02-13 | 河北工业大学 | Method for testing snow and ice melting capability of phase-change asphalt mixture |
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| CN107228880A (en) * | 2017-05-22 | 2017-10-03 | 浙江大学 | The program control system and its method of thermal circulation performance test are stored for phase-change material |
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2019
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| CN106675524A (en) * | 2016-07-13 | 2017-05-17 | 北京化工大学 | Multifunctional phase change material microcapsule and preparation method thereof |
| CN107228880A (en) * | 2017-05-22 | 2017-10-03 | 浙江大学 | The program control system and its method of thermal circulation performance test are stored for phase-change material |
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| CN111650073B (en) * | 2020-06-15 | 2024-02-13 | 河北工业大学 | Method for testing snow and ice melting capability of phase-change asphalt mixture |
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