Phase change energy storage material for heat preservation at night and preparation method

Abstract

The invention relates to a phase change energy storage material for heat preservation at night. The medium consists of a CaC12-MgCl2-H2O water salt system and a nucleating agent; the CaC12-MgCl2-H2O water salt system consists of 80-95 % of calcium chloride hexahydrate, 1-7 % of magnesium chloride hexahydrate and 3-15 % of deionized water by mass; and the content of the nucleating agent is 0.5-2.0 % of the total amount of the CaC12-MgCl2-H2O water salt system. The phase change energy storage material has the advantages of high phase change latent heat, relatively low melting temperature and adjustable solidification temperature, can be used for avoiding the phase separation phenomenon, and can be applied to different seasons and different regions.

Description

technical field [0001] The invention relates to a phase-change energy storage material and a preparation method, in particular to a phase-change energy storage material and a preparation method that can be used for night heat preservation. Background technique [0002] At present, a major problem encountered in the development and utilization of clean energy such as solar energy is the storage of energy. A high-efficiency energy storage material can solve this problem to a certain extent, and energy storage materials are used in the "power supply system" It has broad application prospects in fields such as "moving peaks and filling valleys", recycling industrial waste heat and energy-saving materials for civil buildings. The phase change temperature of low-temperature phase change materials is close to room temperature, and has broad application prospects in the fields of building materials, heating equipment, and agricultural greenhouses. At present, there are not many type...

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Problems solved by technology

[0004] Existing room temperature phase change energy storage materials cannot meet the following application requirements:

[0005] (1) The melting temperature of the phase change material is too high, and generally cannot be melted at a lower temperature (about 20°C);

[0006] (2) The solidification temperature range of phase change materials is too narrow to crystallize and solidify at nighttime temperatures in different seasons or regions;

[0007] (3) The melting temperature and solidification temperature of the phase-change energy storage materials reported in the above patents are very close, which cannot achieve the effect of high-temperature energy storage and low-temperature heat release, so it is difficult to be practically applied;

[0008] ⑷ The common phase separation and supercooling phenomena of inorganic phase change energy storage materials cannot be effectively solved

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