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Inorganic combined phase-change material for heat storage

A mixed phase change material and inorganic technology, applied in the chemical field, can solve the problems of supercooling, low phase change heat, precipitation, etc., and achieve the effect of small supercooling, high phase change heat and good fluidity

Inactive Publication Date: 2009-04-29
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic phase change materials have stable properties, but low phase change heat; inorganic crystalline hydrated salt phase change materials have large phase change heat, but have defects of supercooling and precipitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get sodium acetate trihydrate by mass ratio, 87.8 parts; Carboxymethyl cellulose, 1.7 parts; Disodium hydrogen phosphate dodecahydrate, 1.0 part; Sodium carboxymethyl cellulose, 0.5 part; Sodium chloride solution (mass concentration 26.5 parts %), 9.0 parts; Nano copper powder, 3ppm. Grind all the materials in a mortar and mix them evenly to obtain a phase change material with a phase change temperature of 52.6°C, an undercooling degree of 2°C, and a phase change heat of 308MJ / m 3 , The thermal conductivity is 1.0W / m·k. If the amount of nano-copper powder is doubled to 6ppm, the phase change temperature of the obtained phase change material is 53.5°C, the degree of supercooling is 3.5°C, the heat of phase change is 297MJ / m3, and the thermal conductivity is 1.2W / m. k.

Embodiment 2

[0025] Get sodium acetate trihydrate by mass ratio, 86.0 parts; Carboxymethyl cellulose, 1.4 parts; Disodium hydrogen phosphate dodecahydrate, 2.8 parts; Sodium carboxymethyl cellulose, 0.8 part; Sodium chloride solution (mass concentration 20 %), 9.0 parts. Grind all the materials in a mortar and mix them evenly to obtain a phase change material with a phase change temperature of 56.8°C, an undercooling degree of 4°C, and a phase change heat of 284MJ / m 3 , The thermal conductivity is 0.82W / m·k.

Embodiment 3

[0027] Get sodium acetate trihydrate by mass ratio, 81 parts; Carboxymethyl cellulose, 8 parts; Disodium hydrogen phosphate dodecahydrate, 3.5 parts; Sodium carboxymethyl cellulose, 2 parts; Sodium chloride solution (mass concentration 20 parts %), 5 parts. Grind all the materials in a mortar and mix them evenly to obtain a phase change material. The phase change temperature is 57.2°C, the degree of supercooling is 4°C, and the heat of phase change is 282MJ / m 3 , The thermal conductivity is 0.86W / m·k.

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PUM

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Abstract

The invention provides an inorganic mixed phase-change material for heat accumulation, which has stable performance, small supercooling degree and large phase-change heat. The inorganic mixed phase-change material for heat accumulation is formed through evenly mixing the following compositions in mass portion: 80 to 88 portions of sodium acetate trihydrate, 1 to 10 portion of carboxymethyl cellulose, 0.5 to 3.5 portions of disodium phosphatedodecahydrate, 0.1 to 2.5 portions of sodium carboxymethylcellulose, 5 to 10 portions of sodium chloride solution with mass concentration of between 20 and 30 percent and 0 to 10 ppm portions of nanometer copper powder. The inorganic mixed phase-change material is mainly applied to heat accumulation for an air conditioner and can be also used for other heat accumulation systems (solar energy, waste heat utilization and the like). The material solves two difficult problems of supercooling and precipitation, and has stable performance, small supercooling degree and phase-change heat. Simultaneously, after phase change, the prepared phase-change material at a liquid state has good fluidity and wide application occasions.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to an inorganic mixed phase-change material for heat storage. technical background [0002] Heat storage technology is an important technology to improve the utilization rate of heat energy, solve the problem of asynchronous heat consumption and heat supply, and an important link in the field that can meet the needs of various energy sources. Heat storage technology is widely used, not only for waste heat recovery, air conditioning heat storage, power peak shaving, but also for discontinuous energy (wind energy, solar energy, etc.) to continuous energy. Using this technology can reduce energy consumption, save operating costs, and realize efficient and reasonable use of energy. [0003] Air conditioning is widely used in buildings, and consumes a lot of power. At the same time, buildings also have useful heat needs. If the heat of the air-conditioning condenser can be recycled, ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 梁德青石海民李栋梁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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