A gradient phase change heat storage body and its preparation method

Abstract

The invention relates to the technical field of change materials and heat storage thereof, in particular to a gradient phase change heat storage body and a preparation method thereof. Each group of gradient phase change units in the present invention includes a cylindrical outer phase change layer, a cylindrical inner phase change layer, and a heat-conducting separation film, and the heat-conducting separation film is arranged between the cylindrical outer phase change layer and the cylindrical inner phase change layer. During the interval, the phase change temperature of each layer of phase change material from the inside to the outside decreases sequentially from high to low. When there are more than one gradient phase change unit group, a thermally conductive separation film is provided for each two gradient phase change unit groups. The high and low temperature difference naturally formed from the inside to the outside of the present invention can be correspondingly exchanged by the phase change heat storage body from the inside to the outside.

Description

technical field [0001] The invention relates to the technical field of change materials and heat storage thereof, in particular to a gradient phase change heat storage body and a preparation method thereof. Background technique [0002] Phase change heat storage uses the heat absorption and release of materials at the melting point to achieve isothermal heat storage, which is more efficient than sensible heat storage. [0003] The outermost layer of the heat storage body is closest to the external environment, and heat dissipation inevitably occurs, resulting in a lower temperature of the outer layer of the heat storage body than the inner layer, forming a state of cold outside and hot inside. When phase change materials with low phase change temperature are used for heat storage, all levels can be as close as possible to the phase change working state, the proportion of sensible heat can be minimized, and heat storage can be performed with the highest efficiency. At present...

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Problems solved by technology

[0003] The outermost layer of the heat storage body is closest to the external environment, and heat dissipation inevitably occurs, resulting in a lower temperature of the outer layer of the heat storage body than the inner layer, forming a state of cold outside and hot inside. When phase change materials with low phase change temperature are used for heat storage, all levels can be as close as possible to the phase change working state, the proportion of sensible heat can be minimized, and heat storage can be performed with the highest efficiency. At present, such technical methods at home and abroad relatively rare

[0004] Chinese patent CN105509528A discloses "A Multi-level Gradient Phase Change Cooler", which arranges multi-level phase change layers with different phase change temperatures from top to bottom in order to realize the heat exchange medium and each level of phase change layer in turn. In this way, when the fluid heat exchange medium undergoes heat exchange during the heat exchange process, its own temperature is constantly changing, and it happens to perform efficient phase change heat with multiple phase change heat storage layers at different phase change temperature points. The patent cannot be used for the high-efficiency phase conversion heat of the temperature difference between the inner and outer layers of the heat storage; Chinese patent CN108413796A discloses "A Temperature Gradient Energy Storage Heat Exchanger", which also uses multiple heat storage splints to stack up to achieve gradient heat exchange. The patent also cannot be used for high-efficiency phase-change heat storage based on the temperature difference between the inner and outer layers of the heat storage body

Chinese patent CN106940148A discloses a "Variable Gradient Fractal Lattice Sandwich Strengthened Phase Change Heat Sink", the principle is to arrange the phase change cores in sequence in an array according to the gradient method to improve the heat exchange efficiency, and its basic structure is also in accordance with the heat flow direction; Chinese patent CN106221676A discloses a "phase change heat storage material with multiple phase change points and its preparation process", the principle is to mix a variety of phase change materials with different phase change points to form a Graded phase change materials with phase change temperature, because the phase change materials are mixed, there is no effect of sequential heat exchange in layers

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