CONTROLLABLE PHASE CHANGE MATERIAL BAG AND PREPARATION METHOD THEREOF AND APPLICATION THEREOF

Abstract

A controllable phase change material bag and a preparation method and an application thereof are provided. The preparation method comprises the following steps: 1, form a metal plate or a metal bar with a rough surface, embedding a powder seed crystal that induces a phase change material to nucleate on the surface, then placing the metal plate or the metal bar in a sodium acetate solution to obtain a controllable trigger metal electrode (1); and 2, mixing a sodium acetate trihydrate crystal, water and a thickener to obtain an oversaturated phase change heat storage solution, pouring the solution into a metal ball (2), carrying out encapsulation after inserting the controllable trigger metal electrode obtained in the step 1 and a conducting electrode (3), and finally placing in the water bath to preserve heat to obtain the controllable phase change material bag.

Claims

1. A preparation method of a controllable phase change material bag, comprising the following preparation steps: step 1, carrying out a surface treatment on a metal plate or a metal bar to form a metal plate with a rough surface or a metal bar with a rough surface, embedding a powder seed crystal that induces a phase change material to nucleate on the rough surface of the metal plate or the rough surface of the metal bar, then placing the metal plate or the metal bar carrying the power seed crystal in a sodium acetate solution and placing the sodium acetate solution in a water bath to preserve heat to obtain a controllable trigger metal electrode (1); and step 2, mixing the phase change material with a sodium acetate trihydrate crystal, water and a thickener to form a mixture, carrying out a water bath heating and a stirring till the mixture is fully dissolved to obtain an oversaturated phase change heat storage solution, pouring the solution into a stainless steel metal ball (2), carrying out an encapsulation after inserting the controllable trigger metal electrode (1) obtained in the step 1 and a conducting electrode (3), and finally placing the steel metal ball in the water bath to preserve heat to obtain the controllable phase change material bag.

2. The preparation method according to claim 1, wherein in the step 1, the surface treatment is sanding by an abrasive paper or notching by a cutting tool, and the abrasive paper is 80-1200 meshes.

3. The preparation method according to claim 1, wherein the powder seed crystal in the step 1 is a powder seed crystal formed by grinding a sodium acetate trihydrate crystal.

4. The preparation method according to claim 1, wherein a heat preservation temperature of the water bath in the step 1 is 70° C. to 80° C. and a heat preservation time is 1 hour to 2 hours.

5. The preparation method according to claim 1, wherein in the step 2, a mass fraction of the sodium acetate trihydrate crystal is 73.5 wt % to 91 wt %, a mass fraction of the water is 8.5 wt % to 24.5 wt % and a mass fraction of the thickener is 0.5 wt % to 2 wt %.

6. The preparation method according to claim 1, wherein a heating temperature in the water bath in the step 2 is 70° C. to 80° C., a heat preservation temperature in the water bath is 70° C. to 80° C., and a heat preservation time is 1 hour to 2 hours.

7. The preparation method according to claim 1, wherein a material of the controllable trigger metal electrode (1) is silver or copper, the conducting electrode (3) is a graphite electrode, and the thickener is carboxymethylcellulose or sodium polyacrylate.

8. A controllable phase change material bag obtained by the preparation method according to claim 1.

9. The controllable phase change material bag according to claim 8, wherein a voltage is applied between the controllable trigger electrodes to trigger the oversaturated phase change heat storage solution to change the phase and release heat, and the voltage ranges from 0.5 V to 1.8 V.

10. A use of the controllable phase change material bag according to claim 8 in waste heat recovery of solar energy, a heat pump, a water heater or a boiler.

11. A controllable phase change material bag obtained by the preparation method according to claim 2.

12. A controllable phase change material bag obtained by the preparation method according to claim 3.

13. A controllable phase change material bag obtained by the preparation method according to claim 4.

14. A controllable phase change material bag obtained by the preparation method according to claim 5.

15. A controllable phase change material bag obtained by the preparation method according to claim 6.

16. A controllable phase change material bag obtained by the preparation method according to claim 7.

17. A use of the controllable phase change material bag according to claim 9 in waste heat recovery of solar energy, a heat pump, a water heater or a boiler.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Description of the Drawings

[0026] FIG. 1 is a schematic diagram of a phase change heat storage apparatus of a controllable phase change material bag prepared by the present invention.

[0027] FIG. 2 is a schematic diagram of an edge shape of a metal electrode treated by a scratch of a cutting tool in Embodiment 2.

DESCRIPTION OF THE EMBODIMENTS

Embodiments of the Present Invention

[0028] In order to better understand the present invention, the content of the present invention is further illustrated below in combination with embodiments, but the content of the present invention is not limited to the embodiments below.

Embodiment 1

[0029] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0030] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a silver filament electrode is taken, a surface of the silver filament electrode is polished with 80-mesh abrasive paper, and the surface is coated with the ground powder; then the surface is polished with 320-mesh abrasive paper, and the surface is coated with the powder; the surface is polished with 1200-mesh abrasive paper again, the sodium acetate trihydrate powder is coated to the surface, and an electrode carrying a powder seed crystal is placed in a sodium acetate solution in a water bath at 75° C. to preserve heat for 2 hours to obtain a controllable trigger metal electrode 1.

[0031] (2) 82.2% of sodium acetate trihydrate, 16.8% of water and 1% of carboxymethylcellulose are weighed in percent by mass and filled in a beaker, and components are stirred in a water bath at 75° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and the prepared solution is poured into a stainless steel ball 2 while it is hot, then the metal electrode prepared in the step (1) and a graphite rod electrode 3 are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 75° C. in the water bath for 2 hours to obtain the controllable phase change material bag, as shown in FIG. 1.

[0032] After the controllable phase change material bag prepared in the present embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 1V voltage between the anodic metal silver electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the water bath at 75° C. and completely change into a solution, so that a cycle period is short, cyclicity is good and attenuation is slow.

Embodiment 2

[0033] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0034] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a copper filament electrode is taken, a scratch is scratched at a tail end of the electrode with a knife, the scratch at the tail end of the copper filament rod is coated with the ground powder, and then the metal electrode is placed in a sodium acetate solution to preserve heat in a 70° C. water bath for 1 hour to obtain a controllable trigger metal electrode, as shown in FIG. 2.

[0035] (2) 91% of sodium acetate trihydrate, 8.5% of water and 0.5% of carboxymethylcellulose are weighed in percent by mass, and components are stirred in a water bath at 80° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and the prepared solution is poured into a stainless steel ball while it is hot, then the above pre-treated metal electrode and a graphite rod electrode are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 70° C. in the water bath for 2 hours to obtain the controllable phase change material bag.

[0036] After the controllable phase change material bag prepared in the present embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 1.8 V voltage between the anodic metal copper electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the water bath at 75° C. and completely change into a solution, so that a cycle period is short, and cyclicity is good.

Embodiment 3

[0037] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0038] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a silver filament electrode is taken, a scratch is scratched at a tail end of the electrode with a knife, the scratch at the tail end of the silver filament rod is coated with the ground powder, and then the silver filament electrode is placed in a sodium acetate solution to preserve heat in a 75° C. water bath for 2 hours to obtain a controllable trigger metal electrode.

[0039] (2) 73.5% of sodium acetate trihydrate, 24.5% of water and 2% of sodium polyacrylate are weighed in percent by mass, and components are stirred in a water bath at 70° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and the prepared solution is poured into a stainless steel ball while it is hot, then the above pre-treated metal electrode and a graphite rod electrode are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 75° C. in the water bath for 2 hours to obtain the controllable phase change material bag.

[0040] After the controllable phase change material bag prepared in the present embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 0.5 V small voltage between the anodic metal silver electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the water bath at 75° C. and completely change into a solution, so that a cycle period is short, cyclicity is good and attenuation is slow.

Embodiment 4

[0041] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0042] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a silver plate electrode is taken, a surface of the silver plate electrode is polished with 80-mesh abrasive paper, and the surface is coated with the ground powder; then the surface is polished with 320-mesh abrasive paper, and the surface is coated with the powder; the surface is polished with 1200-mesh abrasive paper again, the sodium acetate trihydrate powder is coated to the surface, and an electrode carrying the powder seed crystal is placed in a sodium acetate solution in a 80° C. water bath to preserve heat for 1 hour to obtain a controllable trigger metal electrode.

[0043] (2) 73.5% of sodium acetate trihydrate, 24.5% of water and 2% of carboxymethylcellulose are weighed in percent by mass, and components are stirred in a water bath at 80° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and then the above pre-prepared silver plate electrode and a graphite rod electrode are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 80° C. in the water bath for 1 hour to obtain the controllable phase change material bag.

[0044] After the controllable phase change material bag prepared in the present embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 0.8 V voltage between the anodic metal silver electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the water bath at 75° C. and completely change into a solution. It can be recycled to use, with slow attenuation and good cyclicity.

Embodiment 5

[0045] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0046] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a copper plate electrode is taken, a scratch is scratched at the copper plate electrode with a cutting tool, the scratch is coated with the ground powder, and then the electrode is placed in a sodium acetate solution to preserve temperature in a 70° C. water bath for 2 hours to obtain a controllable triggered electrode.

[0047] 82.2% of sodium acetate trihydrate, 16.8% of water and 1% of sodium polyacrylate are weighed in percent by mass, and components are stirred in a water bath at 75° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and then the above pre-prepared copper plate electrode and a graphite rod electrode are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 70° C. in the water bath for 2 hour to obtain the controllable phase change material bag.

[0048] After the controllable phase change material bag prepared in the present embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 1.6V voltage between the anodic metal copper plate electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the 70° C. water bath and completely change into a solution. It can be recycled to use, with good cyclicity.

Embodiment 6

[0049] A method for preparing a controllable phase change material bag includes the following preparation steps.

[0050] (1) A sodium acetate trihydrate crystal is placed in a mortar and is ground into power for later use; a silver plate electrode is taken, a scratch is scratched at the silver plate electrode with a cutting tool, the scratch is coated with the ground powder, and then the electrode is placed in a sodium acetate solution to preserve heat in a 80° C. water bath for 1 hours to obtain a controllable trigger metal electrode.

[0051] 91% of sodium acetate trihydrate, 8.5% of water and 0.5% of sodium polyacrylate are weighed in percent by mass, and components are stirred in a water bath at 70° C. till the components are fully dissolved to obtain an oversaturated phase change heat storage solution; and then the above pre-prepared silver plate electrode and a graphite rod electrode are inserted into the oversaturated phase change heat storage solution, and it is sealed and is subject to heat preservation at 80° C. in the water bath for 1 hour to obtain the controllable phase change material bag.

[0052] After the controllable phase change material bag prepared in the embodiment is cooled to room temperature, and the phase change material is triggered to crystallize and release heat within 5 s by applying a 1.2 V voltage between the anodic metal silver plate electrode and the cathodic graphite rod electrode. It only takes about 12 minutes for 20 ml of room temperature crystals to store heat again in the water bath at 75° C. and completely change into a solution, so that a cycle period is short, cyclicity is good, and attenuation is slow.

[0053] The embodiments are preferred modes of execution of the present invention. The modes of execution of the present invention are not limited by the embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent substitute modes and shall come within the protection scope of the present invention.