Regeneration method of circulated hydrated salt system phase change energy storage material

Abstract

The invention discloses a regeneration method of a circulated hydrated salt system phase change energy storage material. The method comprises the following steps: testing phase change latent heat of a series of hydrated salt system phase change energy storage materials with different water contents so as to establish a phase change latent heat-water content standard curve; and performing a DSC test on a circulated hydrated salt system phase change energy storage material, determining whether the circulated hydrated salt system phase change energy storage material is in a water-deficient state or a multi-water state according to the endothermic peak shape of the circulated hydrated salt system phase change energy storage material, and determining the water addition amount or the water evaporation amount according to the phase change latent heat-water content standard curve so as to realize regeneration of the circulated hydrated salt system phase change energy storage material. According to the regeneration method provided by the invention, the regeneration accuracy and yield of the circulated hydrated salt system phase change energy storage material are greatly improved while the recovery process is simplified.

Description

technical field [0001] The invention belongs to the technical field of hydrated salt utilization, and in particular relates to a method for regenerating a phase-change energy storage material of a hydrated salt system after circulation. Background technique [0002] After a long-term phase change (melt-crystallization) cycle, the phase change energy storage material of the eutectic hydrated salt system usually undergoes a certain degree of phase separation, which leads to a great attenuation of the heat storage performance of the material, and the phase separation is usually due to Due to the water-sensitive characteristics of the material, that is, phase separation occurs due to changes in the water content of the system during the cycle. [0003] At present, there are few studies on the recycling and reuse of eutectic hydrated salt system phase change energy storage materials that undergo phase separation after long-term thermal cycles and lead to performance deterioration...

AI Technical Summary

Problems solved by technology

The existing methods for preparing new eutectic hydrate salt system phase change energy storage materials using the expired eutectic hydrate salt system phase change energy storage materials are relatively complicated and have low yields

For example, it is necessary to measure the concentration of various ions in the system, and then select an appropriate extraction process. During the separation and extraction process, part of the material is usually lost, resulting in a low yield.

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