CN105154021A - Highly heat-conducting phase change heat storage material and preparation method therefor - Google Patents

Abstract

The invention discloses a highly heat-conducting phase change heat storage material and a preparation method therefor. The heat storage material is prepared by compounding 67.5% by mass of paraffin, 7.5% by mass of expanded graphite and 25% by mass of through-hole foamed aluminum. The melting point of selected paraffin in the materials is 40-60 DEG C, and the porosity of the selected through-hole foamed aluminum in the materials is over 90%. The material has the advantages that the material is fast in heat absorption and heat release speed and great in heat storage, and is not varied in shape after phase change.

Description

A kind of high heat conduction phase-change heat-storage material and preparation method thereof

One, technical field

The present invention relates to phase-change heat-storage material field, refer in particular to a kind of heat accumulating utilizing paraffin, expanded graphite, fine-crystal spume aluminium alloy compound to prepare.

Two, background technology

Energy-conservation is an important topic of field of energy utilization with environmental protection, utilizes the latent heat of phase change storage power of phase-change heat-storage material to be a kind of novel power-saving technology.Phase change material, in phase transition process, absorbs the heat of surrounding environment, and when envrionment temperature reduces around, Environment release heat towards periphery, thus reach control ambient temperature and energy-conservation object.It all has wide practical use in fields such as Solar use, energy recovery, air conditioner refrigerating, building energy conservation, aerospace.

Sun power, as a kind of energy of inexpensive clean, is widely used in the middle of productive life at present, but quantitatively with on the time can not well mate and coordinate due to the supply and demand of sun power, causes mass energy to waste.As superfluous in sun power on daytime, cause sun power to waste, and night and overcast and rainy sun power not enough.The shortcoming of current heat accumulating ubiquity heat conductivility difference, the phase-change thermal storage parts therefore made, due to poor thermal conductivity, cannot give full play to the heat storage function of heat accumulating.Secondly, during heat accumulating generation solid-liquid phase change, fluid leakage problems can be caused.

In order to solve the problem, by phase-change heat-storage material and the strong base material compound of certain capacity of heat transmission, and shaping material can be added, making a kind of novel heat accumulating, improve thermal conductivity and the sizing characteristics of heat accumulating.

Three, summary of the invention

The object of this invention is to provide a kind of high heat conduction phase-change heat-storage material, the phase-change thermal storage temperature of this heat accumulating is in the operating temperature range of solar water heater, and latent heat of phase change is higher, and heat conductivility is better.

Another object of the present invention is to provide the preparation method of above-mentioned heat accumulating.

The object of the invention is to be achieved through the following technical solutions:

A kind of high heat conduction phase-change heat-storage material, it is characterized in that: this heat accumulating is made up of paraffin, expanded graphite, fine-crystal spume aluminium alloy compound, wherein the massfraction of paraffin accounts for 67.5%, expanded graphite massfraction accounts for 7.5%, the massfraction of fine-crystal spume aluminium alloy accounts for 25%, the paraffin melting point selected in above-mentioned materials is between 40 DEG C-60 DEG C, and the fine-crystal spume aluminium alloy voidage selected is more than 90%.

The preparation method of above-mentioned high heat conduction phase-change heat-storage material, adopts following steps:

(1) fine-crystal spume aluminium alloy is processed into required shape and size;

(2) make mould according to required shape, the fine-crystal spume aluminium alloy processed is placed in mould;

(3) Graphite Powder 99 of drying is placed in encloses container and is heated to 800 DEG C, form expanded graphite;

(4) by melted paraffin wax, add expanded graphite according to 10% mass ratio, mixture, after 1 hour, is injected mould by whip attachment, makes mixture liquid just submergence fine-crystal spume aluminium alloy;

(5) by paraffin, expanded graphite mixture, the cooling of fine-crystal spume aluminium alloy mixture, remove mould, obtain high heat conduction phase-change heat-storage material.

The present invention has three advantages:

(1) the heat accumulating heat conductivility prepared of the present invention is higher, and exotherm rate is faster in heat absorption;

(2) heat accumulating that prepared by the present invention maintains the physics-chem characteristic of paraffin, has stable, that enthalpy of phase change is high feature.

(3) heat accumulating that prepared by the present invention can not change its profile when phase transformation, can effectively prevent from revealing.

Four, embodiment

Below with example, embodiments of the present invention are described further:

Fine-crystal spume aluminium alloy is processed into the right cylinder of φ 46*1500.Make mould according to the size of φ 46*1500, and ready-made fine-crystal spume aluminium alloy is inserted in mould.The Graphite Powder 99 of drying is placed in encloses container and is heated to 800 DEG C, form expanded graphite.Heating paraffin melted, add expanded graphite according to 10% mass ratio, mixture, after 1 hour, is injected mould by whip attachment, makes mixture liquid amount just submergence fine-crystal spume aluminium alloy.Heat accumulating of shaping is obtained after mould is removed in cooling.Fine-crystal spume aluminium alloy selects the material of porosity 90%, and therefore in mixture, fine-crystal spume aluminium alloy massfraction accounts for 25%, and Quality of Paraffin Waxes mark accounts for 67.5%, and expanded graphite massfraction accounts for 7.5%.This material phase transformation latent heat is 125kJ/kg, and thermal conductivity is 5.1W/ (mK).

Claims (2)

1. one kind high heat conduction phase-change heat-storage material, it is characterized in that: this heat accumulating is made up of paraffin, fine-crystal spume aluminium alloy compound, wherein the massfraction of paraffin accounts for 67.5%, expanded graphite massfraction accounts for 7.5%, the massfraction of fine-crystal spume aluminium alloy accounts for 25%, the paraffin melting point selected in above-mentioned materials is between 40 DEG C-60 DEG C, and the fine-crystal spume aluminium alloy voidage selected is more than 90%.

2. a preparation method for high heat conduction phase-change heat-storage material according to claim 1, is characterized in that it comprises the steps:

(1) fine-crystal spume aluminium alloy is processed into required shape and size;

(2) make mould according to required shape, the fine-crystal spume aluminium alloy processed is placed in mould;

(3) Graphite Powder 99 of drying is placed in encloses container and is heated to 800 DEG C, form expanded graphite;

(4) by melted paraffin wax, add expanded graphite according to 10% mass ratio, mixture, after 1 hour, is injected mould by whip attachment, makes mixture liquid just submergence fine-crystal spume aluminium alloy;

(5) by paraffin, expanded graphite mixture, the cooling of fine-crystal spume aluminium alloy mixture, remove mould, obtain high heat conduction phase-change heat-storage material.