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Consistent melting composite phase change material and preparation method thereof

A composite phase change material and a technology for phase change materials, which are applied in the field of consistent melting composite phase change materials and their preparation, and can solve problems such as technology mismatch.

Pending Publication Date: 2022-01-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is how to solve the technical mismatch between the phase change temperature zone of magnesium nitrate hexahydrate as a single-phase hydrated salt phase change material and the temperature at the end of the radiator

Method used

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  • Consistent melting composite phase change material and preparation method thereof
  • Consistent melting composite phase change material and preparation method thereof
  • Consistent melting composite phase change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Weigh a total of 50g of materials, wherein magnesium nitrate hexahydrate accounts for 60mol%, lithium nitrate accounts for 40mol%, mix well, put in a magnetic stirrer and seal the container; heat the water bath to a constant 95 ℃ on the constant temperature magnetic stirrer, wait for it After being completely melted into a liquid state, magnetically stirred for 30 minutes to ensure uniform mixing until the mixture was in a uniform liquid state, and there were obvious liquid flow traces in the shaking beaker; cooled and solidified to room temperature to obtain a consistent molten phase change material of magnesium nitrate hexahydrate-lithium nitrate.

Embodiment 2

[0044] Weigh 50g of the material in Example 1, heat it to a liquid state in a beaker, add 2.5wt% expanded graphite to the beaker, heat and stir for 30min until fully mixed to obtain a mixed molten material, and then cool and solidify to room temperature , to obtain magnesium nitrate hexahydrate-lithium nitrate-expanded graphite composite phase change material.

Embodiment 3

[0046] Weigh a total of 60g of materials, wherein magnesium nitrate hexahydrate accounts for 70mol%, lithium nitrate accounts for 30mol%, mix well, put in a magnetic stirrer and seal the container; heat the water bath to a constant 93 ℃ on the constant temperature magnetic stirrer, wait for it After being completely melted into a liquid state, magnetically stirred for 40 minutes to ensure uniform mixing, until the mixture was in a uniform liquid state, and there were obvious liquid flow traces in the shaking beaker; cooled and solidified to room temperature to obtain a consistent molten phase change material of magnesium nitrate hexahydrate-lithium nitrate.

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Abstract

The invention discloses a consistent melting composite phase change material and a preparation method, and belongs to the technical field of phase change energy storage materials. The consistent melting composite phase change material comprises a phase change material and a heat conduction material, wherein the phase change material comprises a main phase change material and an auxiliary phase change material; the main phase change material is magnesium nitrate hexahydrate, and the content of the main phase change material in the phase change material is 60-70 mol%; the auxiliary phase change material is lithium nitrate, and the content of the auxiliary phase change material in the phase-change material is 30-40mol%; the content of the heat conduction material is 0-5wt% of the sum of the main phase change material and the auxiliary phase change material, and the content is not 0. The phase-change temperature of the main-phase phase-change material is adjustable by using the auxiliary phase, the eutectic phase-change material can relieve the problems of large supercooling degree and serious phase separation of a single hydrated salt phase-change material, and the supercooling degree of the phase-change material is extremely small, so that a nucleating agent does not need to be added in the preparation process; and the phase change material has high compatibility with aluminum and stainless steel 304, and can be widely applied to the field of clean heating.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage materials, and relates to a consistent melting composite phase change material and a preparation method thereof. Background technique [0002] At present, heating energy consumption accounts for more than 7% of my country's energy consumption. With my country's vigorous promotion of energy revolution and the recently proposed carbon peak and carbon neutral goals, clean heating has rapidly risen to become a major strategic demand in my country. According to the "Winter Clean Heating Plan in the Northern Region", by 2021, the clean heating rate in the northern region will reach 70%, replacing 150 million tons of loose coal. In recent years, under my country's "coal-to-electricity" policy, most of the northern regions of China have carried out coal-to-electricity clean heating in winter, aiming to reduce coal-fired heating. Since most urban power grids in my country currently imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李建强王会次恩达李晓卿
Owner UNIV OF SCI & TECH BEIJING
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