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Phase-change material capable of storing energy for long time at room temperature as well as preparation and application of phase-change material

A technology of phase change material and energy storage material, applied in heat exchange materials, energy storage, reduction of greenhouse gases, etc., can solve the problems of supercooling, phase separation, strong metal corrosion, etc., to achieve simple preparation process and convenient operation , the effect of excellent heat storage performance

Pending Publication Date: 2022-05-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the inorganic hydrated salt system (Chinese patent CN 103712255B) is widely used as a cross-seasonal phase change energy storage material. It has high heat storage density and low price, but the inorganic hydrated salt is highly corrosive to metals and has phase separation. and severe overcooling

Method used

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  • Phase-change material capable of storing energy for long time at room temperature as well as preparation and application of phase-change material
  • Phase-change material capable of storing energy for long time at room temperature as well as preparation and application of phase-change material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Dissolve 0.2 g of anionic polyacrylamide with a molecular weight of 500 W in 20 ml of water, and stir at room temperature for 5 hours to obtain a homogeneous polyacrylamide aqueous solution with a mass percentage concentration of 1%.

[0023] (2) 1.8 g of erythritol was added to the polyacrylamide aqueous solution in step (1), and stirred at room temperature for 2 h to form a homogeneous sugar alcohol polymer aqueous solution. The mass ratio of erythritol to polyacrylamide is 90:10.

[0024] (3) Transfer the prepared sugar alcohol polymer aqueous solution into a reagent bottle, dry the water at 110° C. under normal pressure for 16 hours, and obtain a phase change material loaded with erythritol and capable of long-term energy storage at room temperature.

[0025] The prepared phase change material with long-term energy storage at room temperature is a transparent liquid, and the thermal analysis curve is as follows figure 1 As shown, the melting enthalpy is 209.19 ...

Embodiment 2

[0027] (1) Dissolve 0.4 g of nonionic polyacrylamide with a molecular weight of 500 W in 20 ml of water, and stir at room temperature for 5 hours to obtain a homogeneous polyacrylamide aqueous solution with a mass percentage concentration of 2%.

[0028] (2) 7.6 g of erythritol was added to the polyacrylamide aqueous solution in step (1), and stirred at room temperature for 2 h to form a homogeneous sugar alcohol polymer aqueous solution. The mass ratio of erythritol to polyacrylamide is 95:5.

[0029] (3) Transfer the prepared sugar alcohol polymer aqueous solution into a reagent bottle, dry the water at 80° C. under normal pressure for 48 hours, and obtain a phase change material loaded with erythritol and capable of long-term energy storage at room temperature.

[0030] The prepared phase change material that can store energy for a long time at room temperature is a transparent liquid, the melting enthalpy is 238.22 J / g, the cold crystallization enthalpy is 179.37 J / g, and ...

Embodiment 3

[0032] (1) Dissolve 0.32 g of anionic polyacrylamide with a molecular weight of 500 W in 16 ml of water, and stir at room temperature for 5 hours to obtain a homogeneous polyacrylamide aqueous solution with a mass percentage concentration of 2%.

[0033] (2) 3.68 g of erythritol was added to the polyacrylamide aqueous solution in step (1), and stirred at room temperature for 2 h to form a homogeneous sugar alcohol polymer aqueous solution. The mass ratio of erythritol to polyacrylamide is 92:8.

[0034] (3) Transfer the prepared sugar alcohol polymer aqueous solution into a reagent bottle, dry the water at 110° C. under normal pressure for 16 hours, and obtain a phase change material loaded with erythritol and capable of long-term energy storage at room temperature.

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Abstract

The invention discloses a preparation method of a phase change material capable of storing energy for a long time at room temperature. According to the method, a phase-change material erythritol is used as a heat storage unit, polyacrylamide is used as a material for improving the thermal stability of supercooled liquid, and the phase-change material which can store heat for a long time at room temperature, can crystallize and release heat in mechanical modes such as stirring and the like and can store energy for a long time, and heat release is controllable is prepared. The phase change material capable of storing energy for a long time at room temperature prepared by the method has the advantages of high latent heat of phase change, good energy storage stability, good thermal stability, simple operation, low cost and the like, and can be easily applied to the aspects of solar heat energy storage, waste heat recovery and utilization and the like.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials and their preparation, and relates to the design and preparation technology of a phase-change material capable of storing energy for a long time at room temperature. Background technique [0002] The intermittent nature of solar energy makes it a mismatch between thermal energy supply and demand. For example, there is abundant solar heat energy in summer, but a lot of it cannot be used. In winter, the weather is cold, and solar heating cannot meet people's needs. Therefore, the development of long-term phase change energy storage technology and the improvement of energy utilization efficiency are of great significance to my country's energy development. Phase change energy storage materials can absorb or release a large amount of latent heat of phase change during the phase change process, and the heat storage is much higher than that of traditional sensible heat ene...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02E70/30
Inventor 史全李艳更孙克衍
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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