CN105623618A - Inorganic hydrated salt composite phase change heat storage material and preparation method thereof - Google Patents

Abstract

The invention discloses an inorganic hydrated salt composite phase change heat storage material and a preparation method thereof. The heat storage material is composed of a mixture of crystalline hydrated salt, a thickening agent, a nucleating agent, and expanded graphite. The mass percentage of the crystalline hydrated salt is 79.13%, the mass percentage of the thickening agent is 0.791%, the mass percentage of the nucleating agent is 0.079%, and the mass percentage of the expanded graphite is 20%. The material has the advantages of faster endothermic and exothermic speeds, and no appearance change after phase change.

Description

A kind of inorganic hydrated salt composite 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 crystalline hydrate salt, thickening agent, nucleator and expanded graphite compound to prepare.

Two, background technology

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

Solar energy, as the energy of a kind of inexpensive clean, has been widely used in the middle of productive life at present, but owing to the supply and demand of solar energy quantitatively can not well be mated with on the time and coordinate, causes mass energy to waste. As superfluous in solar energy on daytime, cause solar energy to waste, and night and overcast and rainy solar energy are not enough. The shortcoming of current heat accumulating ubiquity heat conductivility difference, the phase-change thermal storage parts therefore made are due to poor thermal conductivity, it is impossible to 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 problems referred to above, it is possible to by base material compound strong to phase-change heat-storage material and certain capacity of heat transmission, and add shaping material, make a kind of composite phase-change heat-storage material, improve heat conductivity and the sizing characteristics of heat accumulating.

Three, summary of the invention

It is an object of the invention to provide a kind of inorganic hydrated salt composite 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, when there is solid-liquid phase change, it is possible to keep shape invariance.

The preparation method that it is a further object of the present invention to provide above-mentioned heat accumulating.

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

A kind of inorganic hydrated salt composite phase-change heat-storage material, it is characterized in that: this heat accumulating is made up of the mixing of crystalline hydrate salt, thickening agent, nucleator and expanded graphite, wherein crystalline hydrate salt mass fraction accounts for 79.13%, thickener qualities mark accounts for 0.791%, nucleator mass fraction accounts for 0.079%, and expanded graphite mass fraction accounts for 20%.

The preparation method of above-mentioned inorganic hydrated salt thermal energy storage material, adopts following steps:

(1) expansible graphite is placed in 60 DEG C of vacuum drying ovens dry 10 hours, dried expansible graphite is placed in rustless steel container, be heated to 800 DEG C and expand 60 seconds, obtain expanded graphite;

(2) crystalline hydrate salt is heated to fusing point fusing, according to quality than crystalline hydrate salt: thickening agent: nucleator is that 1000:10:1 adds thickening agent, nucleator, and stirs;

(3) expanded graphite 1:4 in mass ratio is joined in the mixture described in second step, under agitation adsorb 1 hours, prepare heat accumulating.

The present invention has two advantages:

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

(2) heat accumulating prepared by the present invention will not change its profile when phase transformation, it is possible to effectively prevents from revealing.

Four, detailed description of the invention

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

20g expansible graphite is placed in 60 DEG C of vacuum drying ovens dry 10 hours, dried expansible graphite is placed in rustless steel container, be heated to 800 DEG C and expand 60 seconds, obtain expanded graphite; Take the heating of 79.13g sal glauberi to 32 DEG C of fusings, add 0.791g thickening agent, add 0.079g nucleator, stir; 20g expanded graphite is added in the mixture of fusing, under agitation adsorb 1 hours, make heat accumulating. The phase transition temperature of this material is 32 DEG C, and latent heat of phase change is 154kJ/kg.

Claims (2)

1. an inorganic hydrated salt composite phase-change heat-storage material, it is characterized in that: this heat accumulating is made up of the mixing of crystalline hydrate salt, thickening agent, nucleator and expanded graphite, wherein crystalline hydrate salt mass fraction accounts for 79.13%, thickener qualities mark accounts for 0.791%, nucleator mass fraction accounts for 0.079%, and expanded graphite mass fraction accounts for 20%.

2. the preparation method of the inorganic hydrated salt composite phase-change heat-storage material described in a claim 1, it is characterised in that it comprises the steps:

(1) expansible graphite is placed in 60 DEG C of vacuum drying ovens dry 10 hours, dried expansible graphite is placed in rustless steel container, be heated to 800 DEG C and expand 60 seconds, obtain expanded graphite;

(2) crystalline hydrate salt is heated to fusing point fusing, according to quality than crystalline hydrate salt: thickening agent: nucleator is that 1000:10:1 adds thickening agent, nucleator, and stirs;

(3) expanded graphite 1:4 in mass ratio is joined in the mixture described in second step, under agitation adsorb 1 hours, prepare heat accumulating.