A kind of phase change heat storage material and its preparation method and application

Abstract

The invention discloses a phase change heat storage material and a preparation method thereof. The phase change heat storage material comprises the following raw materials in parts by weight: 55-70 parts of sodium acetate trihydrate, 1-5 parts of a phase change point conditioning agent, 20-30 parts of a softening agent, 1.08 parts of a nucleating agent, 0.5-1 part of an overcooling-proof agent and 5-15 parts of water. The phase change temperature of the prepared phase change heat storage material is 50-55 DEG C, the latent heat of phase change is 200-250 KJ / kg, the phase change process is reversible, the degree of overcooling is low, softness can be kept after phase change crystallization, and the application potentiality is high in various heat storage fields. The phase change heat storage material is soft and elastic, and can be used for heat storage type heating pads which are particularly used after shower; the phase change heat storage material can also be used for indoor heating appliances of foot pads, cushions and the like.

Description

technical field [0001] The invention relates to a phase-change thermal storage material, a preparation method and an application of the phase-change thermal storage material, and belongs to the technical field of energy storage. Background technique [0002] Phase Change Materials (Phase Change Materials, referred to as PCM. The so-called phase change energy storage refers to the absorption or release of energy during the phase change process. When the phase change material changes from liquid to solid state, it needs to undergo a change in physical state. In these two During the phase change process, the material absorbs heat from the environment, and vice versa, releases heat to the environment. The energy that can be stored or released when the physical state changes is called phase change heat, and the temperature range for phase change is very narrow. The physical state occurs When changing, the temperature of the material itself remains almost constant before the phase...

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Problems solved by technology

However, when the inorganic hydrated salt sodium acetate trihydrate is used as heat storage, there are three problems: one is the problem of supercooling, the inorganic hydrated salt sodium acetate trihydrate cannot release the latent heat stored in the required temperature range and lose the value of heat storage; It is a problem of phase stratification. With the repeated heating-cooling thermal cycle of the system, more and more sediments will result in less and less effective heat storage medium, which means that the heat storage capacity is getting worse and worse, and the heat storage product is reduced. The third is that the crystal becomes needle-shaped after crystallization, which is very hard and cannot be used as a phase change material in civil energy storage technology

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