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Method of preparing organic molecular alloy phase change energy storage material

A technology of energy storage materials and organic molecules, applied in heat exchange materials, chemical instruments and methods, instruments, etc., can solve problems such as low density, aging, and small thermal conductivity

Inactive Publication Date: 2006-11-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of organic phase change materials are good formability in solid state, generally not easy to appear supercooling phenomenon and phase separation, less corrosive material, relatively stable performance, less toxicity, and low cost; the disadvantage is that the thermal conductivity is small , The density is small, so the energy storage capacity per unit volume is small, the melting point is low, it is not suitable for high temperature applications, and it is volatile, flammable, even explosive, or aging due to slow oxidation by oxygen in the air

Method used

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  • Method of preparing organic molecular alloy phase change energy storage material
  • Method of preparing organic molecular alloy phase change energy storage material
  • Method of preparing organic molecular alloy phase change energy storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use chemically pure n-octanoic acid and lauric acid as raw materials. Set the test ratio (molar ratio) series as n-octanoic acid: lauric acid=5:95, 10:90, 15:85, 20:80, 25:75, 30:70, 35:65, 40:60, 45 : 55, 50: 50, 55: 45, 60: 40, 65: 35, 70: 30, 75: 25, 80: 20, 85: 15, 90: 10, 95: 5. Keep the test mixture in a constant temperature and heat preservation container at 80°C for 4 hours, then put the test tube into the water bath of the ultrasonic generator, control the temperature of the water bath to 60°C, the ultrasonic vibration time for 3 minutes, and the ultrasonic frequency for 40-50 Kilohertz. After the thermal analysis test of the above-mentioned series of trial mixes, the trial mix with single phase transition temperature and maximum phase transition heat is taken, and the target ratio is determined to be n-octanoic acid: lauric acid = 80:20 (molar ratio). See the DSC test results of the alloy figure 1 .

Embodiment 2

[0019] Use chemically pure n-octanoic acid and palmitic acid as raw materials. Set the trial ratio (molar ratio) series as n-octanoic acid: palmitic acid=5:95, 10:90, 15:85, 20:80, 25:75, 30:70, 35:65, 40:60, 45 : 55, 50: 50, 55: 45, 60: 40, 65: 35, 70: 30, 75: 25, 80: 20, 85: 15, 90: 10, 95: 5. Keep the test mixture in a constant temperature and heat preservation container at 90℃ for 2.5 hours, then put the test tube into the water bath of the ultrasonic generator, control the temperature of the water bath to 50℃, the ultrasonic vibration time for 5 minutes, and the ultrasonic frequency for 40-50 Kilohertz. After the thermal analysis test of the above-mentioned series of trial mixes, the trial mix with single phase transition temperature and maximum phase transition heat is taken, and the target ratio is determined to be n-octanoic acid: palmitic acid = 95: 5 (molar ratio). See the DSC test results of the alloy figure 2 .

Embodiment 3

[0021] Use chemically pure capric acid and myristic acid as raw materials. Set the test ratio (molar ratio) series as capric acid: myristic acid = 5: 95, 10: 90, 15: 85, 20: 80, 25: 75, 30: 70, 35: 65, 40: 60, 45:55, 50:50, 55:45, 60:40, 65:35, 70:30, 75:25, 80:20, 85:15, 90:10, 95:5. Keep the test mixture in a constant temperature and heat preservation container at 100°C for 1 hour, then put the test tube into the water bath of the ultrasonic generator, control the temperature of the water bath to 80°C, the ultrasonic vibration time for 1 minute, and the ultrasonic frequency for 40-50 Kilohertz. After the thermal analysis test of the above-mentioned series of trial mixes, the trial mix with single phase transition temperature and maximum phase transition heat is taken, and the target mix ratio is determined to be capric acid: myristic acid = 75: 25 (molar ratio). See the DSC test results of molecular alloys image 3 .

[0022] From the above examples and the DSC test results of or...

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Abstract

The invention relates to phase change energy storage material manufacturing method field. The method includes the following steps: preparing proper mixture; keeping it at 80-100 centigrade degree for 1-4 hours; shaking for 1-5 minutes with 40-50 kHz ultrasonic; controlling the temperature at 50-80 centigrade degree; and testing the phase change temperature and heat. The formed material has adjustable phase change temperature and high phase change heat.

Description

Technical field [0001] The invention belongs to the technical field of thermal energy storage, and particularly relates to the field of preparation methods of phase change energy storage materials. Background technique [0002] Phase change energy storage materials use the material to absorb or release heat during the phase change process to store or release energy. It has the characteristics of high heat storage density, similar heat storage and heat release, and easy control of the process. There are many types of phase change energy storage materials, which can be divided into solid-solid phase change materials, solid-liquid phase change materials, solid-gas phase change materials, liquid-gas phase change materials, etc. according to the way of phase change; Divided into inorganic and organic (including polymer) phase change energy storage materials. [0003] Commonly used organic phase change materials are paraffin, fatty acids or their esters, alcohols, aromatic hydrocarbons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06G01K17/08
Inventor 张东田胜力
Owner TONGJI UNIV
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