Low-temperature inorganic composite phase-change thermal energy storage material and preparation method thereof

A phase-change heat storage material and inorganic composite technology, which are applied in the field of low-temperature inorganic composite phase-change heat storage materials and their preparation, can solve the problems of low density of graphene aerogel, harsh preparation conditions, difficult industrialization, etc. Cyclic stability, low preparation cost, and shape-controllable effects

Inactive Publication Date: 2017-07-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, barium hydroxide octahydrate also suffers from two major drawbacks common to hydrated salts as phase-change heat storage materials: phase separation and supercooling
Although the heat storage material prepared by this method has a large amount of heat storage, and the degree of supercooling and phase separation is improved, the density of the graphene airgel prepared by this method is low and uncontrollable, so the improvement of the thermal conductivity of the phase change material is limited, and the highest thermal conductivity The coefficient is 1.24W / (K m); in addition, the freeze-drying of the graphene airgel requires a vacuum degree of less than 0.01Mpa and a temperature of less than -30°C. The preparation conditions are harsh and it is difficult to industrialize

Method used

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  • Low-temperature inorganic composite phase-change thermal energy storage material and preparation method thereof
  • Low-temperature inorganic composite phase-change thermal energy storage material and preparation method thereof
  • Low-temperature inorganic composite phase-change thermal energy storage material and preparation method thereof

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Embodiment 1

[0032] A method for preparing a low-temperature inorganic composite phase-change heat storage material, comprising the following steps:

[0033] 1) Add 0.5g of emulsifier OP‐10 to 1000g of absolute ethanol, shake well, add 1.884g of expanded graphite with a size of 50 mesh, control the temperature of the water bath at 50°C, and ultrasonically treat for 1 hour to obtain a uniform expanded graphite dispersion. Heating at 90°C, evaporating the absolute ethanol in the expanded graphite dispersion to constant weight to obtain hydrophilic expanded graphite;

[0034]2) select diameter to be 4cm, be high to be the stainless steel mold of 1.5cm, the hydrophilic expanded graphite that step 1 obtains is pressed into volume in this mold and be 18.84cm 3 Cylindrical block, based on the mass of the initial expanded graphite, the block has a density of 100kg / m 3 .

[0035] 3) Weigh 50g of barium hydroxide octahydrate, place it in a closed stainless steel container, and heat it to a molten ...

Embodiment 2

[0038] A method for preparing a low-temperature inorganic composite phase-change heat storage material, comprising the following steps:

[0039] 1) Add 1g of emulsifier OP‐10 to 2000g of absolute ethanol, shake well, add 3.768g of expanded graphite with a size of 100 mesh, control the temperature of the water bath at 50°C, and ultrasonicate for 1 hour to obtain a uniform dispersion of expanded graphite. Heating at 90°C, evaporating the absolute ethanol in the expanded graphite dispersion to constant weight to obtain hydrophilic expanded graphite;

[0040] 2) select diameter to be 4cm, be high to be the stainless steel mold of 1.5cm, the hydrophilic expanded graphite that step 1 obtains is pressed into volume in this mold and be 18.84cm 3 Cylindrical block, based on the mass of the initial expanded graphite, the block has a density of 200kg / m 3 .

[0041] 3) Weigh 80g of barium hydroxide octahydrate, place it in a closed stainless steel container, and heat it to a molten stat...

Embodiment 3

[0044] A method for preparing a low-temperature inorganic composite phase-change heat storage material, comprising the following steps:

[0045] 1) Add 2g of emulsifier OP‐10 to 2000g of absolute ethanol, shake well, add 5.652g of expanded graphite with a size of 200 mesh, control the temperature of the water bath at 50°C, and ultrasonicate for 1 hour to obtain a uniform dispersion of expanded graphite. Heating at 90°C, evaporating the absolute ethanol in the expanded graphite dispersion to constant weight to obtain hydrophilic expanded graphite;

[0046] 2) select diameter to be 4cm, be high to be the stainless steel mold of 1.5cm, the hydrophilic expanded graphite that step 1 obtains is pressed into volume in this mold and be 18.84cm 3 Cylindrical block, based on the original expanded graphite mass, the density of the block is 300kg / m 3 .

[0047] 3) Weigh 100g of barium hydroxide octahydrate, place it in a closed stainless steel container, and heat it to a molten state at...

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Abstract

The invention discloses a low-temperature inorganic composite phase-change thermal energy storage material and a preparation method thereof. The preparation method includes: dispersing expandable graphite into the anhydrous ethanol solution of emulsifier, and performing ultrasonic treatment and drying to obtain modified expandable graphite; compressing the modified expandable graphite into a solid block with certain density, soaking the solid block into molten barium octahydrate, taking out the expandable graphite block which absorbs the barium octahydrate, and cooling to obtain the solid-solid low-temperature inorganic composite phase-change thermal energy storage material. The preparation method has the advantages that the barium octahydrate rich in source is used as the main component, the prepared inorganic composite phase-change thermal energy storage material is fixed in shape, liquid exudation after complete heat absorption and phase change can be avoided, the phase change temperature of the material is 75-80 DEG C, the phase change latent heat of the material is 200-250kJ / kg, the undercooling of the material is smaller than 4 DEG C, the heat conductivity coefficient of the material is 1.992-4.222W / (K.m), and the performance of the material has no evident change after 1000 times of thermal circulation.

Description

technical field [0001] The invention relates to the field of phase change heat storage materials, in particular to a low-temperature inorganic composite phase change heat storage material with a phase change temperature of 75-80°C and a preparation method thereof. Background technique [0002] Phase change materials have important application value in energy storage and utilization. Extensive use of fossil energy has caused serious smog, while clean energy such as solar energy and wind energy will not cause environmental problems. However, clean energy such as solar energy and wind energy is limited by region, climate, time, etc. How to efficiently store these energy sources has become an important topic and research direction for efficient use of clean energy. In addition, during the peak period of electricity consumption, the load on the power grid is heavy, while in the period of low power consumption, there is excess power that is not consumed. The realization of "peak ...

Claims

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Application Information

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IPC IPC(8): C09K5/06C09K5/14
CPCC09K5/063C09K5/14
Inventor 袁文辉肖强强李莉张正国高学农
Owner SOUTH CHINA UNIV OF TECH
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