A kind of room temperature phase change energy storage material and preparation method thereof

A phase change energy storage material and phase change material technology, which are applied in the field of room temperature phase change energy storage materials and their preparation, can solve the problems of phase separation, high degree of supercooling, poor thermal conductivity, etc., so as to increase stability and improve wetting. performance, effect of reducing supercooling

Active Publication Date: 2020-11-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of inorganic salt hydrates in the field of phase change energy storage generally has problems such as large supercooling, poor thermal conductivity, and phase separation.

Method used

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  • A kind of room temperature phase change energy storage material and preparation method thereof
  • A kind of room temperature phase change energy storage material and preparation method thereof
  • A kind of room temperature phase change energy storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 (with hydroxylated carbon nanotubes as nucleating agent)

[0040] (1) Dissolve anhydrous calcium chloride and anhydrous magnesium chloride in deionized water, prepare a nearly saturated solution at 60-100°C, carry out suction filtration and purification while it is hot, let it stand at room temperature for 24 hours, and remove the liquid by suction filtration to obtain high purity CaCl 2 ·6H 2 O, MgCl 2 ·6H 2 O crystals;

[0041] (2) Weigh 22.5g and 7.5g of CaCl respectively 2 ·6H 2 O and MgCl 2 ·6H 2 O crystals are placed in a beaker, heated to 60-100°C, and kept for 10 minutes to completely melt the mixture;

[0042] (3) Magnetically stir the system prepared in step (2) at 60-100° C. for 1-3 h, add 0.15 g of hydroxyethyl cellulose as a thickener and 0.75 g of hydroxylated carbon nanotubes as a nucleating agent during the stirring process, Ultrasonic dispersion at 40-50°C for 1-2 hours, until the system is evenly mixed, and finally MgCl 2 ·6H 2 ...

Embodiment 2

[0044] Embodiment 2 (with SrCl 2 ·6H 2 O, SrCO 3 as a nucleating agent)

[0045] (1) Dissolve anhydrous calcium chloride and anhydrous magnesium chloride in deionized water, prepare a nearly saturated solution at 60-100°C, carry out suction filtration and purification while it is hot, let it stand at room temperature for 24 hours, and remove the liquid by suction filtration to obtain high purity CaCl 2 ·6H 2 O, MgCl 2 ·6H 2 O crystals;

[0046] (2) Weigh 22.5g and 7.5g of CaCl respectively 2 ·6H 2 O and MgCl 2 ·6H 2 O crystals are placed in a beaker, heated to 60-100°C, and kept for 10 minutes to completely melt the mixture;

[0047] (3) Magnetically stir the system prepared in step (2) at high temperature for 2 hours, add 0.15 g of thickener during the stirring process, and disperse with high-temperature ultrasonic for 1 hour until the system is evenly mixed;

[0048] (4) Weigh again 0.9g of SrCl 2 ·6H 2 O and 0.3 g of SrCO 3 As an inorganic salt nucleating age...

Embodiment 3

[0050] Embodiment 3 (with hydroxylated carbon nanotubes as nucleating agent, and change the add-on of hydroxylated carbon nanotubes)

[0051] (1) Dissolve anhydrous calcium chloride and anhydrous magnesium chloride in deionized water, prepare a nearly saturated solution at 60-100°C, carry out suction filtration and purification while it is hot, let it stand at room temperature for 24 hours, and remove the liquid by suction filtration to obtain high purity CaCl 2 ·6H 2 O, MgCl 2 ·6H 2 O crystals;

[0052] (2) Weigh 22.5g and 7.5g of CaCl respectively 2 ·6H 2 O and MgCl 2 ·6H 2 O crystals are placed in a beaker, heated to 60-100°C, and kept for 10 minutes to completely melt the mixture;

[0053] (3) Magnetically stir the system prepared in step (2) at 60-100°C for 1-3 hours, add 0.15g hydroxyethyl cellulose as a thickener and 0.00g, 0.15g, 0.30g, 0.45g during the stirring process, 0.60g, 0.75g of hydroxylated carbon nanotubes are used as nucleating agents, ultrasonicall...

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Abstract

The invention discloses a room-temperature phase-change energy accumulation material and a preparation method. Synergistic effect can be generated by adding MgCl2 6H2O-CaCl2 6H2O to hydroxylation carbon nano tube and mineral salt to be taken as a composite nucleator to promote the nucleating of a phase change material together to significantly reduce the degree of super-cooling of a system. The material has the advantages that when the introduction weight of CNTs, SrCO3, SrCl2 6H2O are respectively 0.75 g, 0.3 g and 0.9 g, the degree of super-cooling of the system is merely 0.6 DEG C, and thematerial has higher energy saving capacity and good circulation stability.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage materials, in particular to a room temperature phase change energy storage material and a preparation method thereof. Background technique [0002] The reserves of magnesium salts in the Qinghai Salt Lake area in my country are extremely rich and of high quality, but a large amount of magnesium salts is recognized as a "magnesium hazard" because no suitable use has been found. Among many magnesium salts, MgCl 2 ·6H 2 O has a high heat of fusion (171kJ / kg), and has been widely studied as a phase-change energy storage material, but due to the high phase-change temperature (118°C), it must be combined with CaCl to realize its application at room temperature. 2 ·6H 2 O and other materials form a composite system. However, the application of inorganic salt hydrates in the field of phase change energy storage generally has problems such as large undercooling, poor thermal conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 侯峰卢竼漪
Owner TIANJIN UNIV
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