Micro-nano emulsion phase-change material, phase-change heat exchange tube and preparation method of phase-change material

Abstract

The invention provides a micro-nano emulsion phase change material, a phase change heat exchange tube and a preparation method of the phase change material. The preparation method comprises the following steps of: weighing oil and an emulsifier of which the thermal conductivity is lower than that of a base solution according to a set mass ratio, putting the oil and the emulsifier into a beaker containing deionized water, then putting the beaker onto a magnetic stirrer, stirring for a first preset time at room temperature, and performing uniform mixing to obtain an oil-in-water primary emulsion; placing the oil-in-water primary emulsion in an ultrasonic generator, performing ultrasonic treatment on the oil-in-water primary emulsion for a second preset time so as to obtain an oil-in-water phase change emulsion; putting the oil-in-water phase change emulsion and carbon nano tubes into a test tube according to a certain proportion, putting the test tube on the magnetic stirrer for stirring, and then putting the test tube in an ultrasonic cell disruptor for ultrasonic oscillation for a third preset time, so as to make the oil-in-water phase change emulsion uniformly mixed with the carbon nanotubes to obtain the micro-nano emulsion phase change material with a non-Fourier heat conduction characteristic. The phase-change heat exchange tube comprises a micro-emulsion nano-liquid phase-change material and a round tube with convex cells on oleophylic and oleophobic wall surfaces.

Description

technical field [0001] The invention belongs to the technical field of phase-change energy storage, and in particular relates to a micro-nano emulsion phase-change material and a preparation method, and an energy storage heat exchange tube containing the micro-nano-emulsion phase-change material. Background technique [0002] Phase change materials can absorb / release a large amount of heat at a constant temperature during phase change, and are usually used for thermal energy storage and enhanced heat transfer. However, the low equivalent thermal conductivity of water in the process of energy storage / release as a phase change material causes the problem of slow energy transfer. Therefore, it is necessary to design a material and its heat exchange tube to improve the thermal conductivity of the phase change material, reduce the flow resistance, increase the degree of solidification supercooling, and increase the latent heat of solidification. It is used in many fields such as...

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