Nanometer aluminum oxide/paraffin compound phase change heat storage material, preparation thereof and application thereof

A composite phase change material and nano-alumina technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as wear or blockage, density difference, etc., to improve dispersibility, increase thermal conductivity, and improve thermal conductivity Effect

Inactive Publication Date: 2010-06-09
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the large density difference between the metal or metal oxide and the organic PCM, when the composite phase change material is melted, the solid particles of the millimeter or micron scale are easily precipitated in the mixed solution; When the composite phase change material of particles transfers the stored energy, it is easy to cause adverse results such as wear or clogging

Method used

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  • Nanometer aluminum oxide/paraffin compound phase change heat storage material, preparation thereof and application thereof
  • Nanometer aluminum oxide/paraffin compound phase change heat storage material, preparation thereof and application thereof
  • Nanometer aluminum oxide/paraffin compound phase change heat storage material, preparation thereof and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A composite phase change thermal storage material containing 0.2% volume fraction of alumina was prepared. Prepare alumina powder (average particle size 100 nm, gamma type) and paraffin wax at a volume ratio of 0.2:99.8, mix alumina and oleylamine (volume ratio of alumina to oleylamine is 2:1), and ball mill for 5 minutes before use. The treated alumina and paraffin were blended and melted in a volume ratio, magnetically stirred for 10 minutes, and ultrasonically vibrated for 40 minutes. The obtained nano-alumina / paraffin composite phase change material had a latent heat of phase change of 169.7J / g and a melting temperature of 48.3°C. , and its thermal conductivity at 25°C is 16% higher than that of palmitic acid. The molten mixture was stable for 24 hours without precipitation.

Embodiment 2

[0027] A composite phase change thermal storage material containing 0.2% volume fraction of alumina was prepared. Prepare alumina powder (average particle size 10 nanometers, gamma type) and paraffin wax at a volume ratio of 0.2:99.8, prepare oleylamine at a volume ratio of alumina to oleylamine of 1:2, add oleylamine to molten paraffin and sonicate for 10 minutes . The molten paraffin mixed with oleylamine was magnetically stirred. Add alumina powder while stirring, and then stir for 10 minutes after the alumina is completely added, then take out the magnet, and ultrasonicate at a constant temperature for 10 minutes, the obtained nano-alumina / paraffin composite phase change material has a latent heat of phase change of 165.7J / g, melts The temperature is 47.8°C, and its thermal conductivity at 25°C is 16.8% higher than that of palmitic acid. After 48 hours the molten mixture did not precipitate out.

Embodiment 3

[0029] A composite phase change heat storage material containing 5.0% volume fraction of alumina was prepared. Prepare alumina powder (average particle size: 20 nm, gamma type) and paraffin wax at a volume ratio of 5:95, mix alumina and oleylamine (volume ratio of alumina to oleylamine is 2:1), and ball mill for 25 minutes before use. The treated alumina and paraffin were blended and melted, magnetically stirred for 120 minutes, and held for 120 minutes with ultrasonic waves. The obtained nano-alumina / paraffin composite phase change material had a latent heat of phase change of 151.6J / g and a melting temperature of 45.3°C. At 25°C, the thermal conductivity is 32% higher than that of the matrix material. The molten mixture was free of precipitation for 48 hours.

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Abstract

The invention relates to a nanometer aluminum oxide/paraffin compound phase change heat storage material, preparation thereof and application thereof. The compound phase change heat storage material is the evenly stabilized compound formed by compounding nanometer aluminum oxide and paraffin. The phase change temperature of the compound phase change heat storage material is adjusted to near the 48 DEG C; thermal analysis tests show that the enthalpy of phase change is big, that the enthalpies of the solid-solid phase change and the solid-liquid total phase change are over 150J/g and that the coefficient of thermal conductivity of the compound phase change heat storage material is greatly increased than that of the mother substance. Thus, the compound phase change heat storage material is widely applied in civilian and military areas such as solar energy utilization, waste heat recovery, intelligent automatic air-conditioning buildings, glass greenhouses, phase change energy storage type air conditioners and constant temperature of electrical appliances.

Description

technical field [0001] The invention relates to a phase-change thermal storage material, in particular to a nano-alumina / paraffin composite phase-change thermal storage material. Background technique [0002] With the increasingly severe situation of the energy environment, it is urgent to make progress in the fields of high-efficiency energy, energy-saving technology, clean energy, and renewable and environmentally friendly energy. Phase change energy storage is an important technology to improve energy utilization efficiency and protect the environment, and an effective way to alleviate the mismatch between energy supply and demand in terms of time, intensity and location. Phase change material (PCM) is the core of phase change energy storage technology. [0003] Most inorganic PCMs are corrosive and have the disadvantages of supercooling and phase separation during the phase change process, which limits their application fields; while organic PCMs are less corrosive and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 王继芬谢华清黎阳
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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