CN107384325B - Method for prolonging service life of hydrated salt phase change material - Google Patents
Method for prolonging service life of hydrated salt phase change material Download PDFInfo
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- CN107384325B CN107384325B CN201710559907.5A CN201710559907A CN107384325B CN 107384325 B CN107384325 B CN 107384325B CN 201710559907 A CN201710559907 A CN 201710559907A CN 107384325 B CN107384325 B CN 107384325B
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- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
Abstract
The invention discloses a method for prolonging the service life of a hydrated salt phase-change material, which is characterized in that the phase-change material is solidified in the temperature atmosphere which is 20-30 ℃ lower than the solidification point of the phase-change material, and the external conditions of ultrasonic vibration, low temperature range and strong impact caused by vibration damage the original crystallization rate, so that crystal particles are refined, higher melting heat is kept, and the service life of the phase-change material is prolonged. The invention does not need to add any other crystal modifier, thickener and the like, maintains the enthalpy value of the phase-change material by using a physical method and prolongs the service life of the phase-change material. The invention only needs the physical method, and has simple operation, safety and reliability.
Description
Technical Field
The invention relates to the field of phase change energy storage, in particular to a method for prolonging the service life of a hydrated salt phase change material.
Background
A Phase Change Material (PCM-Phase Change Material) refers to a substance that changes state of a substance with a Change in temperature and can provide latent heat. The process of changing physical properties is called a phase change process, and in this case, the phase change material absorbs or releases a large amount of latent heat. Once the material is widely applied to human life, the material becomes an optimal green environment-friendly carrier for energy conservation and environmental protection, and is listed as a national research and development utilization sequence in China. Phase change materials can be divided into Organic (Organic) and Inorganic (Inorganic) phase change materials. They can also be divided into Hydrated Salts (Hydrated Salts) phase change materials and waxy (Paraffin Wax) phase change materials. The hydrated salt phase-change material is an important phase-change material in medium-low temperature energy storage, and has the advantages of wide application, low price, high heat of fusion, good heat conductivity and the like. However, there are two significant problems in application, namely supercooling and phase separation. After the liquid substance is subjected to multiple solidification and dissolution cycles, crystal particles become large, and when the liquid substance is dissolved, part of crystals are not dissolved, so that rust which hinders solid-liquid contact is formed, and original inorganic salt crystals cannot be formed, thereby losing efficacy. The addition of the thickening agent and the crystal modifier can prolong the service life of the phase-change material, but also increases the cost, and different phase-change materials need different additives, so that the service life is reduced along with the increase of the cycle number. The method can be used for manufacturing the phase-change material and using the phase-change material, the physical method is safe and reliable, and the application prospect of the hydrated salt phase-change material is greatly improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a physical method for prolonging the service life of a hydrated salt phase-change material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the phase-change material is solidified in the temperature atmosphere which is 20-30 ℃ lower than the solidification point of the phase-change material, and meanwhile, the external condition of ultrasonic vibration is applied, the original crystallization rate can be destroyed by the low temperature range and strong impact caused by vibration, crystal particles are refined, so that higher melting heat is kept, and the service life of the phase-change material is prolonged.
Preferably, the hydrated salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrated salt phase-change material is 240J/g-252J/g, the enthalpy value of the normal freeze-thaw cycle is reduced to 141J/g-150J/g after 400-500 times of freeze-thaw cycles, the enthalpy loss rate reaches 37% -44%, and the enthalpy value of the freeze-thaw cycle using the method is 212J/g-219J/g, and the enthalpy loss rate is 8% -16%.
Preferably, the hydrated salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrated salt phase-change material is 218J/g-226J/g, the enthalpy value of the normal freeze-thaw cycle is reduced to 112J/g-120J/g after 400-500 times of freeze-thaw cycles, the enthalpy loss rate reaches 44% -51%, and the enthalpy value of the freeze-thaw cycle using the method is 182J/g-194J/g, and the enthalpy loss rate is 11% -19%.
Preferably, the hydrated salt phase change material is dodeca-crystal water aluminum sulfate, the initial enthalpy value of the hydrated salt phase change material is 257J/g-269J/g, the enthalpy value of the normal freeze-thaw cycle is reduced to 164J/g-172J/g through 400-500 times of freeze-thaw cycles, the enthalpy loss rate reaches 33% -39%, and the enthalpy value of the freeze-thaw cycle using the method is 223J/g-232J/g, and the enthalpy loss rate is 10% -17%.
The invention has the following advantages:
1. the service life of the hydrous salt phase-change material can be prolonged without adding any other thickening agent and crystal modifier.
2. The method is simple, safe and reliable.
Detailed Description
The present invention will now be described in further detail with reference to examples.
Example 1: a method for prolonging service life of hydrated salt phase change material sodium sulfate decahydrate and a comparative test research show that the hydrated salt phase change material sodium sulfate decahydrate is solidified under the temperature atmosphere of 15 ℃, 20 ℃, 25 ℃, 30 ℃ and 35 ℃ lower than the solidification point of the hydrated salt phase change material, other conditions are the same, and the specific experiment is as follows:
(1) the hydrous salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrous salt phase-change material is 240.134J/g, the phase-change material is solidified in the temperature atmosphere which is 25 ℃ lower than the solidifying point of the hydrous salt phase-change material, ultrasonic vibration is applied at the same time, the enthalpy value of the hydrous salt phase-change material is reduced to 214.278J/g after 400 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 10.8%.
(2) The hydrous salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrous salt phase-change material is 240.134J/g, the phase-change material is solidified in the temperature atmosphere which is 20 ℃ lower than the solidifying point of the hydrous salt phase-change material, ultrasonic vibration is applied at the same time, the enthalpy value of the hydrous salt phase-change material is reduced to 212.280J/g after 400 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 11.6%.
(3) The hydrous salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrous salt phase-change material is 240.134J/g, the phase-change material is solidified in the temperature atmosphere which is 30 ℃ lower than the solidifying point of the hydrous salt phase-change material, ultrasonic vibration is applied at the same time, the enthalpy value of the hydrous salt phase-change material is reduced to 203.634J/g after 400 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 15.2%.
(4) The hydrous salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrous salt phase-change material is 240.134J/g, the phase-change material is solidified in the temperature atmosphere which is 15 ℃ lower than the solidifying point of the hydrous salt phase-change material, ultrasonic vibration is applied at the same time, the enthalpy value of the hydrous salt phase-change material is reduced to 154.886J/g after 400 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 35.5%.
(5) The hydrous salt phase-change material is sodium sulfate decahydrate, the initial enthalpy value of the hydrous salt phase-change material is 240.134J/g, the phase-change material is solidified in the temperature atmosphere which is 35 ℃ lower than the solidifying point of the hydrous salt phase-change material, ultrasonic vibration is applied at the same time, the enthalpy value of the hydrous salt phase-change material is reduced to 177.699J/g after 400 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 26.0%.
Example 2: a method for prolonging the service life of a hydrated salt phase-change material sodium acetate trihydrate and a contrast test research: respectively solidifying under the temperature atmosphere of 15 ℃, 20 ℃, 25 ℃, 30 ℃ and 35 ℃ lower than the solidifying point, comparing the loss rate of the hot break value under the same other conditions, and specifically testing as follows:
(1) the hydrated salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrated salt phase-change material is 224.167J/g, the phase-change material is placed in the temperature atmosphere which is 25 ℃ lower than the freezing point of the hydrated salt phase-change material for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrated salt phase-change material is reduced to 183.153J/g after 450 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 18.3%.
(2) The hydrous salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrous salt phase-change material is 224.167J/g, the phase-change material is placed in a temperature atmosphere which is 20 ℃ lower than the freezing point of the phase-change material for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 186.955J/g after 450 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 16.6%.
(3) The hydrated salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrated salt phase-change material is 224.167J/g, the phase-change material is placed in the temperature atmosphere lower than the freezing point of the phase-change material by 30 ℃ for solidification, ultrasonic vibration is applied for use, the enthalpy value of the phase-change material is reduced to 177.092J/g after 450 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 21.0%.
(4) The hydrated salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrated salt phase-change material is 224.167J/g, the phase-change material is placed in the temperature atmosphere which is 35 ℃ lower than the freezing point of the hydrated salt phase-change material for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrated salt phase-change material is reduced to 138.759J/g after 450 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 38.1%.
(5) The hydrated salt phase-change material is sodium acetate trihydrate, the initial enthalpy value of the hydrated salt phase-change material is 224.167J/g, the phase-change material is placed in the temperature atmosphere lower than the freezing point of the hydrated salt phase-change material by 15 ℃ for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrated salt phase-change material is reduced to 131.586J/g after 450 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 41.3%.
Example 3: the method for prolonging the service life of the hydrated salt phase-change material aluminum sulfate dodecahydrate and the comparative test research: respectively solidifying under the temperature atmosphere of 15 ℃, 20 ℃, 25 ℃, 30 ℃ and 35 ℃ lower than the solidifying point, comparing the loss rate of the hot break value under the same other conditions, and specifically testing as follows:
(1) the hydrous salt phase-change material is dodecacrystalline water aluminum sulfate, the initial enthalpy value of the hydrous salt phase-change material is 259.153J/g, the phase-change material is placed in a temperature atmosphere lower than the freezing point of the dodecacrystalline water aluminum sulfate for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 225.125J/g after 475 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 13.1%.
(2) The hydrous salt phase-change material is dodecacrystalline water aluminum sulfate, the initial enthalpy value of the hydrous salt phase-change material is 259.153J/g, the phase-change material is placed in a temperature atmosphere lower than the freezing point of the dodecacrystalline water aluminum sulfate for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 218.725J/g after 475 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 15.6%.
(3) The hydrous salt phase-change material is dodecacrystalline water aluminum sulfate, the initial enthalpy value of the hydrous salt phase-change material is 259.153J/g, the phase-change material is placed in a temperature atmosphere which is 20 ℃ lower than the freezing point of the dodecacrystalline water aluminum sulfate for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 225.722J/g after 475 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 12.9%.
(4) The hydrous salt phase-change material is dodecacrystalline water aluminum sulfate, the initial enthalpy value of the hydrous salt phase-change material is 259.153J/g, the phase-change material is placed in a temperature atmosphere which is 35 ℃ lower than the freezing point of the dodecacrystalline water aluminum sulfate for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 186.072J/g after 475 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 28.2%.
(5) The hydrous salt phase-change material is dodecacrystalline water aluminum sulfate, the initial enthalpy value of the hydrous salt phase-change material is 259.153J/g, the phase-change material is placed in a temperature atmosphere lower than the freezing point of the dodecacrystalline water aluminum sulfate for solidification, ultrasonic vibration is applied for use, the enthalpy value of the hydrous salt phase-change material is reduced to 174.41J/g after 475 times of freeze-thaw cycles, and the loss rate of the enthalpy value is 32.7%.
From the above experimental studies, it can be known that: the three different hydrous salt phase-change materials are respectively solidified in the temperature atmosphere which is 20-30 ℃ lower than the solidifying point of the hydrous salt phase-change materials, under the condition that other conditions are the same, the loss rate of the heat break value is small, and the loss rate of the heat break value is much larger than that of the solidification temperature of the application when the hydrous salt phase-change materials are solidified in the temperature atmosphere which is 15-35 ℃ lower than the solidifying point of the hydrous salt phase-change materials, so that the technical method for solidifying the hydrous salt phase-change materials in the temperature atmosphere which is 20-30 ℃ lower than the solidifying point of the hydrous salt phase-change materials has obvious beneficial effects.
Claims (2)
1. The method for prolonging the service life of the hydrated salt phase-change material is characterized in that the phase-change material is placed at a temperature lower than the freezing point of the phase-change material for solidification, and is continuously vibrated in the solidification process, the phase-change material is placed at a temperature lower than the freezing point of the phase-change material for solidification by 20-30 ℃, and the vibration is ultrasonic vibration; the hydrated salt phase-change material is sodium sulfate decahydrate, sodium acetate trihydrate or aluminum sulfate dodecahydrate.
2. The method for extending the lifespan of a phase-change material of a hydrated salt according to claim 1, wherein the phase-change material is solidified in a temperature atmosphere lower by 25 ℃ than the solidification point thereof while applying ultrasonic vibration.
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