Phase change heat storage material and preparation method and application thereof

Abstract

The invention provides a phase change heat storage material. The phase change heat storage material is prepared from, by weight, 3-80% of inorganic salt, 30-50% of heat conduction oil, 3-80% of organic wax, 1-35% of water and 2-30% of a surfactant, wherein a mixture of diaromatic hydrocarbon ether and biphenyl is preferably selected as the heat conduction oil. By introducing a certain amount of heat conduction oil into the phase change heat storage material, the heat storage capacity of the material can be significantly improved, so that the material is higher in heat storage density which isup to 260 kJ / kg, larger in heat conductivity coefficient and more sensitive to the ambient temperature; moreover, the particle size of microemulsion particles in the obtained phase change heat storagematerial is larger and more uniform, and therefore the material is more stable to store.

Description

technical field [0001] The invention belongs to the field of heat storage materials, in particular to a phase change heat storage material and its preparation method and application. Background technique [0002] With the country's emphasis on energy conservation and environmental protection, the demand for energy storage materials is also increasing. Among them, the fastest growing energy storage materials are phase change energy storage materials, which can operate in a relatively narrow and stable temperature range. A phase change occurs inside, which in turn causes the absorption and release of heat and heat transfer to the outside. The heat storage density is high, which can solve the contradiction between energy supply and demand in time and space. At present, phase change energy storage materials are used in solar thermal power generation. System, aerospace, electronics industry, waste heat recovery and utilization, etc. have been widely promoted and applied in key fiel...

AI Technical Summary

Problems solved by technology

[0003] The traditional solid-liquid phase change energy storage materials with nitrate as the main medium are not perfect enough, and their energy storage density is small and the thermal conductivity is low when the phase change releases heat, so that it cannot be recovered in time when the temperature changes greatly. Response to heat release limits its application in thermal conductive materials, thermal insulation materials and energy storage materials, and traditional phase change energy storage materials often require special heat exchange devices to reduce the thermal resistance between them and the environment and improve their thermal resistance to the environment. Responsiveness to temperature, which leads to a substantial increase in production costs

[0004] In order to solve the above problems, in the prior art, an emulsifier is added to the traditional phase change heat storage material. The introduction of the emulsifier makes the inorganic salt solution in it wrapped, and a relatively stable phase change heat storage material can be obtained, emulsified The emulsification of the agent can also increase the effective contact area between the material and the outside world, improve the heat transfer efficiency of the heat storage material, and at the same time better stabilize the volume change of the heat storage material during phase transition. For example, CN103059818A discloses a Phase change energy storage material, its components include 3-80% of inorganic salt, 2-30% of emulsifier, 2-5% of co-emulsifier, 3-80% of paraffin and 1-35% of water, obtained The phase change energy storage material can overcome the shortcomings of organic phase change energy storage materials such as supercooling and phase separation, and at the same time overcome the disadvantages of low thermal conductivity of organic phase change energy storage materials. However, the heat storage density of the prepared materials is still relatively low. Low, the thermal conductivity is still small, and the response speed of the obtained material is still slow when used in occasions with rapid temperature changes, and further improvement is needed

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