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Graphene aerogel compound enhanced medium-low-temperature phase change heat storage material and preparation method thereof

A graphene aerogel and heat storage material technology, which is applied in the field of graphene aerogel composite strengthening medium and low temperature phase change heat storage materials and their preparation, can solve the problems of inability to use for a long time, poor stability of phase change materials, etc. Stable performance, improved thermal conductivity, improved effect of supercooling and phase separation

Active Publication Date: 2016-12-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of this phase change material is poor and cannot be used for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The graphite powder is 100 mesh flake graphite, mixed barium hydroxide monohydrate and barium hydroxide octahydrate according to the mass ratio of 1:70, stirred at 90°C for 60min to form a eutectic mixture, and then barium hydroxide monohydrate and barium hydroxide octahydrate The eutectic mixture of hydrated barium hydroxide and the airgel block were mixed at a mass ratio of 50:1, and kept at 85°C for 60 minutes to finally form a composite and uniform graphene airgel composite strengthened phase change thermal storage material.

[0029] It has been determined that the solidification temperature of the graphene airgel composite strengthened medium and low temperature phase change heat storage material prepared in this laboratory is 77°C, the melting temperature is 80°C, the latent heat of solidification is 265.7J / g, and the latent heat of melting is 267.6J / g. Conductivity 1.24W / (m*K).

Embodiment 2

[0031] The graphite powder is 325 mesh flake graphite, mixed barium hydroxide monohydrate and barium hydroxide octahydrate according to the mass ratio of 1:100, stirred at 90°C for 60 minutes to form a eutectic mixture, and then mixed barium hydroxide monohydrate and barium hydroxide octahydrate The eutectic mixture of hydrated barium hydroxide and the airgel block were mixed at a mass ratio of 90:1, and kept at 85°C for 60 minutes to finally form a composite and uniform graphene airgel composite strengthened phase change heat storage material.

[0032] It has been determined that the solidification temperature of the graphene airgel composite strengthened medium-low temperature phase change heat storage material prepared in this laboratory is 76°C, the melting temperature is 80°C, the latent heat of solidification is 312.3J / g, the latent heat of melting is 314.1 / g, and the thermal conductivity Rate 1.13W / (m*K).

Embodiment 3

[0034] The graphite powder is 325 mesh flake graphite, mixed barium hydroxide monohydrate and barium hydroxide octahydrate according to the mass ratio of 1:70, stirred at 85°C for 60min to form a eutectic mixture, and then barium hydroxide monohydrate and barium hydroxide octahydrate The eutectic mixture of hydrated barium hydroxide and the airgel block were mixed at a mass ratio of 80:1, and kept at 85°C for 60 minutes to form a composite and uniform graphene-airgel composite-strengthened phase-change thermal storage material.

[0035] It has been determined that the solidification temperature of the graphene airgel composite strengthened medium and low temperature phase change heat storage material prepared in this laboratory is 76°C, the melting temperature is 81°C, the latent heat of solidification is 289.4J / g, the latent heat of melting is 291.5J / g, and the heat Conductivity 1.18W / (m*K).

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Abstract

The invention relates to a graphene aerogel compound enhanced medium-low-temperature phase change heat storage material and a preparation method thereof. The heat storage material is prepared from aerogel blocks, barium hydroxide monohydrate and barium hydroxide octahydrate. The mass ratio of barium hydroxide octahydrate to barium hydroxide monohydrate is (70-90):1, and the mass ratio of a eutectic mixture of barium hydroxide monohydrate and barium hydroxide octahydrate to the aerogel blocks is (50-100):1. Compared with the prior art, the graphene aerogel compound enhanced medium-low-temperature phase change heat storage material has the advantages of being environmentally friendly, resistant to high temperature and high in heat conducting efficiency, the problems of supercooling and phase separation of an inorganic phase change heat storage material can be relieved, the heat storage amount of the heat storage material is large, the selected graphene aerogel can improve the heat conducting efficiency of barium hydroxide hydrate, and the problem of phase change supercooling is relieved.

Description

technical field [0001] The invention relates to a phase change heat storage material and a preparation method thereof, in particular to a graphene airgel composite strengthened medium and low temperature phase change heat storage material and a preparation method thereof. Background technique [0002] Using phase change latent heat of phase change materials for heat storage is an energy-saving and environmental protection technology. Use the latent heat of phase change at the phase change point of the heat storage material to store excess waste heat, and then release the heat when needed. Using the phase change latent heat of phase change materials can store more heat in the same volume than using material sensible heat, so it has a wider application field, such as building energy saving, heat recovery, etc. [0003] Phase change heat storage materials can be divided into two categories: organic and inorganic. Inorganic phase change materials have high heat storage density...

Claims

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Application Information

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IPC IPC(8): C04B30/00C01B31/04
CPCC04B30/00C04B14/024C04B22/064
Inventor 胡晓斌刘璞罗中元刘琳吕和平杨剑英
Owner SHANGHAI JIAO TONG UNIV
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