CN107384325A - A kind of method for extending hydrous salt phase change material service life - Google Patents
A kind of method for extending hydrous salt phase change material service life Download PDFInfo
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- CN107384325A CN107384325A CN201710559907.5A CN201710559907A CN107384325A CN 107384325 A CN107384325 A CN 107384325A CN 201710559907 A CN201710559907 A CN 201710559907A CN 107384325 A CN107384325 A CN 107384325A
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- C09K5/02—Materials undergoing a change of physical state when used
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Abstract
The invention discloses a kind of method for extending hydrous salt phase change material service life, phase-change material is placed under 20~30 DEG C lower than its freezing point of temperature atmosphere by this method to be solidified, apply the external condition of ultrasonic activation simultaneously, intense impact caused by low temperature range and vibration destroys original crystalline rate, crystal grain is refined, therefore higher heat of fusion is maintained, so as to extend the service life of phase-change material.The present invention need not add any other crystal and change agent, thickener etc., and the heat enthalpy value of phase-change material is maintained using physical method, extends its service life.The physical method that the invention need to only use, it is simple to operate, securely and reliably.
Description
Technical field
The present invention relates to phase-change accumulation energy field, a kind of specific design to side for extending hydrous salt phase change material service life
Method.
Background technology
Phase-change material (PCM-Phase Change Material) refers to vary with temperature and change state of matter and can carry
For the material of latent heat.The process of transformation physical property is referred to as phase transition process, and at this moment phase-change material will absorb or release is substantial amounts of latent
Heat.This material is once widely used in human lives, by as the optimal green carrier of energy-conserving and environment-protective, in China
Sequence is utilized through being classified as national research and development.Phase-change material can be divided into organic (Organic) and inorganic (Inorganic) phase transformation material
Material.Also hydrated salt (Hydrated Salts) phase-change material and wax (Paraffin Wax) phase-change material can be divided into.Hydrated salt
Class phase transformation material is a kind of phase-change material important in middle low temperature accumulation of energy, it has, and use is extensive, cheap, heat of fusion is high,
Many advantages, such as thermal conductivity is good.But in application process, there is also two outstanding problems, problem and phase separation is respectively subcooled in it
Problem.When liquid is after multiple solidification dissolving circulation, crystal grain becomes big, just has partial crystals not molten during dissolving
Solution, " rust " for hindering solid-liquid contact is formed, original inorganic salt crystal can not be formed, so as to fail.Addition thickener, crystal change
The service life of phase-change material can be extended by becoming agent, but also increase cost simultaneously, and be added needed for different phase-change materials
Reagent it is also different, sometimes as the increase of cycle-index, its service life can also have a greatly reduced quality.This method both can be in phase transformation
It is that can also be used in phase-change material use that material, which makes, and physical method is safe and reliable, substantially increases hydrous salt phase transition material
The application prospect of material.
The content of the invention
Present invention aims to overcome that above-mentioned the deficiencies in the prior art, there is provided a kind of physical method extends hydrous salt phase transition
The service life of material.
To achieve the above object, the present invention adopts the following technical scheme that：
Phase-change material, which is placed under 20~30 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation
Intense impact caused by external condition, low temperature range and vibration can destroy original crystalline rate, refine crystal grain,
Therefore higher heat of fusion is maintained, so as to extend the service life of phase-change material.
Preferably, described hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240J/g~252J/g,
By the Frozen-thawed cycled of 400~500 times, the heat enthalpy value of normal Frozen-thawed cycled falls below 141J/g~150J/g, heat content loss late
Reaching 37%~44%, and use heat enthalpy value 212J/g~219J/g of the Frozen-thawed cycled of this method, heat content loss late is 8%~
16%.
Preferably, described hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 218J/g~226J/g,
By the Frozen-thawed cycled of 400~500 times, the heat enthalpy value of normal Frozen-thawed cycled falls below 112J/g~120J/g, heat content loss late
Reach 44%~51%, and use heat enthalpy value 182J/g~194J/g of the Frozen-thawed cycled of this method, heat content loss late is 11%
~19%.
Preferably, described hydrous salt phase change material is 12 crystallization water aluminum sulfate, its initial heat enthalpy value be 257J/g~
269J/g, by the Frozen-thawed cycled of 400~500 times, the heat enthalpy value of normal Frozen-thawed cycled falls below 164J/g~172J/g, heat content
Loss late reaches 33%~39%, and uses heat enthalpy value 223J/g~232J/g of the Frozen-thawed cycled of this method, heat content loss late
For 10%~17%.
The invention has the advantages that：
1st, need not add any other thickener and crystal change agent can extend the service life of hydrous salt phase change material.
2nd, method is simple, securely and reliably.
Embodiment
Presently in connection with embodiment, the present invention is further detailed explanation.
Embodiment 1：Hydrous salt phase change material sal glauberi extends the method and comparative experimental research in life-span:Respectively than
Its freezing point is low 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, solidify under 35 DEG C of temperature atmosphere, other conditions are identical, hotter break value
Loss late, specific experiment are as follows：
(1) hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240.134J/g, and the phase-change material is put
Solidified under 25 DEG C lower than its freezing point of temperature atmosphere, while apply the jelly that ultrasonic activation passes through 400 times using this method
Melt circulation, its enthalpy drops to 214.278J/g, and the loss late of heat enthalpy value is 10.8%.
(2) hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240.134J/g, and the phase-change material is put
Solidified under 20 DEG C lower than its freezing point of temperature atmosphere, while apply the jelly that ultrasonic activation passes through 400 times using this method
Melt circulation, its enthalpy drops to 212.280J/g, and the loss late of heat enthalpy value is 11.6%.
(3) hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240.134J/g, and the phase-change material is put
Solidified under 30 DEG C lower than its freezing point of temperature atmosphere, while apply the jelly that ultrasonic activation passes through 400 times using this method
Melt circulation, its enthalpy drops to 203.634J/g, and the loss late of heat enthalpy value is 15.2%.
(4) hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240.134J/g, and the phase-change material is put
Solidified under 15 DEG C lower than its freezing point of temperature atmosphere, while apply the jelly that ultrasonic activation passes through 400 times using this method
Melt circulation, its enthalpy drops to 154.886J/g, and the loss late of heat enthalpy value is 35.5%.
(5) hydrous salt phase change material is sal glauberi, and its initial heat enthalpy value is 240.134J/g, and the phase-change material is put
Solidified under 35 DEG C lower than its freezing point of temperature atmosphere, while apply the jelly that ultrasonic activation passes through 400 times using this method
Melt circulation, its enthalpy drops to 177.699J/g, and the loss late of heat enthalpy value is 26.0%.
Case study on implementation 2：Hydrous salt phase change material Sodium acetate trihydrate extends the method and comparative experimental research in life-span：Exist respectively
15 DEG C lower than its freezing point, 20 DEG C, 25 DEG C, 30 DEG C, solidify under 35 DEG C of temperature atmosphere, other conditions are identical, hotter break value
Loss late, specific experiment is as follows：
(1) hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 224.167J/g, and the phase-change material is put
Solidified under 25 DEG C lower than its freezing point of temperature atmosphere, while apply ultrasonic activation use, passed through 450 times using this method
Frozen-thawed cycled, its enthalpy drops to 183.153J/g, and the loss late of heat enthalpy value is 18.3%.
(2) hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 224.167J/g, and the phase-change material is put
Solidified under 20 DEG C lower than its freezing point of temperature atmosphere, while apply ultrasonic activation use, passed through 450 times using this method
Frozen-thawed cycled, its enthalpy drops to 186.955J/g, and the loss late of heat enthalpy value is 16.6%.
(3) hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 224.167J/g, and the phase-change material is put
Solidified under 30 DEG C lower than its freezing point of temperature atmosphere, while apply ultrasonic activation use, passed through 450 times using this method
Frozen-thawed cycled, its enthalpy drops to 177.092J/g, and the loss late of heat enthalpy value is 21.0%.
(4) hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 224.167J/g, and the phase-change material is put
Solidified under 35 DEG C lower than its freezing point of temperature atmosphere, while apply ultrasonic activation use, passed through 450 times using this method
Frozen-thawed cycled, its enthalpy drops to 138.759J/g, and the loss late of heat enthalpy value is 38.1%.
(5) hydrous salt phase change material is Sodium acetate trihydrate, and its initial heat enthalpy value is 224.167J/g, and the phase-change material is put
Solidified under 15 DEG C lower than its freezing point of temperature atmosphere, while apply ultrasonic activation use, passed through 450 times using this method
Frozen-thawed cycled, its enthalpy drops to 131.586J/g, and the loss late of heat enthalpy value is 41.3%.
Implementation case row 3：The crystallization water aluminum sulfate of hydrous salt phase change material 12 extends the method and comparative experimental research in life-span：
Solidified respectively under 15 DEG C lower than its freezing point, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C of temperature atmosphere, other conditions are identical, compare
The loss late of hot break value, specific experiment are as follows：
(1) hydrous salt phase change material is 12 crystallization water aluminum sulfate, and its initial heat enthalpy value is 259.153J/g, by the phase transformation
Material, which is placed under 25 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation use, is passed through using this method
The Frozen-thawed cycled of 475 times is crossed, its enthalpy drops to 225.125J/g, and the loss late of heat enthalpy value is 13.1%.
(2) hydrous salt phase change material is 12 crystallization water aluminum sulfate, and its initial heat enthalpy value is 259.153J/g, by the phase transformation
Material, which is placed under 30 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation use, is passed through using this method
The Frozen-thawed cycled of 475 times is crossed, its enthalpy drops to 218.725J/g, and the loss late of heat enthalpy value is 15.6%.
(3) hydrous salt phase change material is 12 crystallization water aluminum sulfate, and its initial heat enthalpy value is 259.153J/g, by the phase transformation
Material, which is placed under 20 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation use, is passed through using this method
The Frozen-thawed cycled of 475 times is crossed, its enthalpy drops to 225.722J/g, and the loss late of heat enthalpy value is 12.9%.
(4) hydrous salt phase change material is 12 crystallization water aluminum sulfate, and its initial heat enthalpy value is 259.153J/g, by the phase transformation
Material, which is placed under 35 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation use, is passed through using this method
The Frozen-thawed cycled of 475 times is crossed, its enthalpy drops to 186.072J/g, and the loss late of heat enthalpy value is 28.2%.
(5) hydrous salt phase change material is 12 crystallization water aluminum sulfate, and its initial heat enthalpy value is 259.153J/g, by the phase transformation
Material, which is placed under 15 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation use, is passed through using this method
The Frozen-thawed cycled of 475 times is crossed, its enthalpy drops to 174.41J/g, and the loss late of heat enthalpy value is 32.7%.
From above experimental study：Three kinds of different hydrous salt phase change materials are respectively at 20 DEG C lower than its freezing point -- and 30
DEG C temperature atmosphere under solidify, in the case of other conditions identical, the loss late of hot break value is small, and its freezing point it is low 15 DEG C and
Solidified under 35 DEG C of temperature atmosphere, hot break value illustrates the application's more relative to big of loss late of the setting temperature of the application
Hydrous salt phase change material is respectively at 20 DEG C lower than its freezing point -- and the technical method solidified under 30 DEG C of temperature atmosphere has notable
Beneficial effect.
Claims (6)
- A kind of 1. method for extending hydrous salt phase change material service life, it is characterised in that the phase-change material is put into than it Solidify at the low temperature of freezing point, constantly vibrated during solidification.
- 2. the method according to claim 1 for extending hydrous salt phase change material service life, it is characterised in that by the phase Change material, which is placed under 20~30 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation.
- 3. the method according to claim 2 for extending hydrous salt phase change material service life, it is characterised in that by the phase Change material, which is placed under 25 DEG C lower than its freezing point of temperature atmosphere, to be solidified, while applies ultrasonic activation.
- 4. as the method for the extension hydrous salt phase change material service life described in claim any one of 1-3, it is characterised in that：Institute The hydrous salt phase change material stated is sal glauberi.
- 5. as the method for the extension hydrous salt phase change material service life described in claim any one of 1-3, it is characterised in that institute The hydrous salt phase change material stated is Sodium acetate trihydrate.
- 6. as the method for the extension hydrous salt phase change material service life described in claim any one of 1-3, it is characterised in that institute The hydrous salt phase change material stated is 12 crystallization water aluminum sulfate.
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Citations (6)
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| US20050195469A1 (en) * | 2004-03-02 | 2005-09-08 | Van Brocklin Andrew L. | Phase change electrophoretic imaging for rewritable applications |
| CN102504768A (en) * | 2011-11-01 | 2012-06-20 | 东南大学 | Method for reducing supercooling degree of hydrous salt phase change material |
| US20150152308A1 (en) * | 2011-12-05 | 2015-06-04 | Hyundai Motor Company | Micro particle for thermal control material and device and method of producing the same using ultrasonic high-temperature vibration scheme |
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| 崔文龙等: ""三水合乙酸钠在相变单元的传热特性及其过冷度改善"", 《化工学报》 * |
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