Method for increasing heat enthalpy value of sodium sulfate decahydrate

Abstract

The invention discloses a method for increasing the heat enthalpy value of sodium sulfate decahydrate, and belongs to a phase-change heat-storage material and a preparation method thereof. According to the method, nanoscale sodium sulfate decahydrate is wrapped with a nanoscale microcapsule, and a nanoscale phase-change heat-storage microcapsule is produced, so that the phase-change temperature and the heat enthalpy value are changed.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage materials and preparation methods thereof, in particular to a method for increasing the enthalpy value of sodium sulfate decahydrate. Background technique [0002] Phase change heat storage or phase change energy storage refers to the phase change latent heat absorbed or released during the process of solidification-melting, solidification-gasification, solidification-sublimation, etc. Phase change heat storage materials are divided into four categories: (1) solid-solid phase change heat storage materials; (2) solid-liquid phase change heat storage materials; (3) liquid-gas phase change heat storage materials; (4) Solid-gas phase change heat storage materials. Among them, (1) solid-solid phase change and (2) solid-liquid phase change heat storage materials are most used. According to different phase change heat storage materials, phase change heat storage materials can be div...

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Problems solved by technology

Crystalline hydrated salts are the most important type of low-temperature phase-change heat storage materials, but the low-temperature phase-change heat storage materials of crystalline hydrated salts will appear supercooling, non-uniform melting and phase separation, so that heat will not be released when it should be released, and in the system Obvious stratification occurs, and the enthalpy of phase change is greatly attenuated. In order to solve the above problems, many people have proposed various schemes, such as: "A Heat Storage Medium and Its Use", application number 200610104583.8, which proposes to use magnesium nitrate, magnesium chloride and water to form Eutectic salt water compound; "An Inorganic Phase Change Energy Storage Material", application number 201210037753.0, which proposes to add nucleating agent and dispersant to the inorganic salt hydrate; "Preparation of an Inorganic Hydrate Salt Phase Change Energy Storage Material Method", application number 200810065301.7, proposed to add anti-supercooling agent sodium tetraborate in inorganic salt hydrate, although these methods have some effects, they are only limited to certain systems

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