Controllable phase change material bag and preparation method and application thereof

A technology of phase change materials and seed crystals, applied in heat exchange materials, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of difficult heat storage and release, and achieve a simple, controllable and easy-to-operate preparation method , short production cycle and simple preparation process

Pending Publication Date: 2019-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to break the metal sheet by hand, so the phase change material can only be packaged in a small soft plastic bag that can touch the metal sheet inside for small-scale heat release, which is only suitable for local physical therapy and health care. However, it is difficult to realize the storage and release of large-area heat in large-scale systems such as solar energy, and the application has limitations.

Method used

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  • Controllable phase change material bag and preparation method and application thereof
  • Controllable phase change material bag and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of the controllable phase change material package comprises the following steps:

[0031] (1) Take the sodium acetate trihydrate crystal and place it in a mortar and grind it into powder for use; take the silver wire electrode, polish the surface with 80-mesh sandpaper, and coat the ground powder on the surface; then polish the surface with 320-mesh sandpaper, The surface is coated with powder; the surface is polished again with 1200 mesh sandpaper, and then coated with a layer of sodium acetate trihydrate powder, and the electrode carrying the powder seed crystal is placed in a sodium acetate solution at 75°C for 2 hours in a water bath to obtain a controllable trigger metal electrode 1;

[0032] (2) In terms of mass fraction, weigh 82.2% of sodium acetate trihydrate crystals, 16.8% of water, and 1% of carboxymethylcellulose into a beaker, stir in a water bath at 75°C until completely dissolved, and obtain a supersaturated phase Change heat storage solu...

Embodiment 2

[0035] The preparation of the controllable phase change material package comprises the following steps:

[0036] (1) Take the sodium acetate trihydrate crystal and place it in a mortar and grind it into powder for later use; take the copper wire electrode, draw a scratch on the end of the electrode with a knife, and apply the ground powder to the scratch on the end of the copper wire rod, Then place the metal electrode in a sodium acetate solution and keep it warm in a 70°C water bath for 1 hour to obtain a controllable trigger metal electrode, as shown in figure 2 shown;

[0037] (2) Weigh 91% of sodium acetate trihydrate, 8.5% of water, and 0.5% of carboxymethyl cellulose in terms of metering fractions, and stir in a water bath at 80°C until completely dissolved to obtain a supersaturated phase-change heat storage solution. Pour the prepared solution into a stainless steel ball while it is hot, then insert the above-mentioned pretreated electrode and graphite rod electrode...

Embodiment 3

[0040] The preparation of the controllable phase change material package comprises the following steps:

[0041] (1) Take the sodium acetate trihydrate crystal and place it in a mortar and grind it into powder for use; take the silver wire electrode, scratch the end of the electrode with a knife, and coat the ground powder on the end of the silver wire rod to scratch, Then place the silver wire electrode in a sodium acetate solution and keep it in a 75°C water bath for 2 hours to obtain a controllable trigger metal electrode;

[0042] (2) In terms of measured fractions, weigh 73.5% of sodium acetate trihydrate, 24.5% of water, and 2% of sodium polyacrylate, and stir in a water bath at 70°C until completely dissolved to obtain a supersaturated phase-change heat storage solution. Pour the prepared solution into a stainless steel ball while it is hot, then insert the above-mentioned pretreated electrode and graphite rod electrode into the supersaturated phase change heat storage so...

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Abstract

The invention discloses a controllable phase change material bag and a preparation method and an application thereof. The preparation method comprises the following steps of (1) performing surface treatment on a metal plate or bar so as to form the metal plate or bar with a rough surface, embedding seed crystal powder which is used for inducing phase change materials into a nucleus into the surface, then putting in a sodium acetate solution, putting the sodium acetate solution in a water bath, and insulating so as to obtain a controllable trigger metal electrode; (2) mixing sodium acetate trihydrate crystal, water and a thickening agent, heating in the water bath and mixing so as to completely dissolve, so that a supersaturated phase transition heat storage solution is obtained, pouring the solution into a stainless steel metal ball, inserting into the controllable trigger metal electrode in the step (1) and a conducting electrode, then packaging, finally, putting in the water bath, and insulating so as to obtain the controllable phase change material bag. According to the controllable phase change material bag, the inherent supercooling defect of inorganic phase change materials is used, so that the controllable heat storage / release of supercooling phase change materials is realized, and the controllable phase change material bag has the advantages of simple preparation process, low equipment cost, short recycling period, stability in heat release and the like.

Description

technical field [0001] The invention relates to the technical field of phase-change thermal storage materials, in particular to a controllable phase-change material package and its preparation method and application. Background technique [0002] Two-thirds of my country's land area receives more than 5000J / m of solar radiation every year 2 , the annual sunshine hours are greater than 2000h, which has great potential for solar energy use. However, due to the intermittent, diurnal periodicity and seasonality of solar energy, its utilization is limited. Energy storage technology has become an effective way to rationally use energy and reduce environmental pollution because it can solve the mismatch problem of heat energy supply and demand in time and space. [0003] The traditional thermal energy storage uses the sensible heat storage of water tanks, which is also the most widely used heat storage method at present. However, the heat storage density of this method is small, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S60/10C09K5/06F28D20/02
CPCF24S60/10C09K5/063F28D20/02Y02B30/52Y02E10/40Y02E70/30Y02E60/14Y02P20/10F28D20/028F28D20/0034
Inventor 张立志余红董传帅
Owner SOUTH CHINA UNIV OF TECH
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