Method for boosting crystallization of phase-change cold-storing material of eutectic salt solution

Abstract

The invention discloses a method for boosting crystallization of a phase-change cold-storing material of a eutectic salt solution. The method comprises the following steps: mixing 100 parts of eutectic salt solution with a mass concentration of 10-26.4% with 0.1-1.2 parts of magnetic metal nanometer particles or magnetic metal oxide nanometer particles, and then adding 0.2-0.6 parts of surface dispersing agent, and ultrasonically treating for more than 30 minutes, thereby obtaining a suspended low-temperature phase-change cold-storing material of the eutectic salt solution. An electromagnetic coil is uniformly wound on an outer wall around a cold-storing tank; a direct current is introduced; the direction of a generated magnetic field is opposite to the direction of gravity; and the strength of the magnetic field is adjusted by changing the size of a voltage. According to the method provided by the invention, the magnetic nanometer particles and the magnetic field effect are utilized to strengthen the heat-transfer characteristic of the traditional cold-storing material of the eutectic salt solution, the nucleating condensate depression is improved, the crystallizing time is shortened, the cold-storing efficiency is increased, and meanwhile, the volume of a heat exchanger is reduced.

Description

technical field [0001] The invention relates to the field of eutectic brine solution phase change cold storage, in particular to a method for promoting the crystallization of eutectic brine solution phase change cold storage materials. Background technique [0002] In recent years, with the rapid growth of my country's economic development, the problem of energy shortage has become increasingly serious, the load of the power grid is too heavy, and the contradiction between peak and valley load differences has become more prominent, resulting in huge energy waste. Phase-change cold storage is an effective means to realize peak-shifting and valley-filling of power grids. The temperature of industrial cold storage is generally below 0°C. Under the current technical conditions, industrial cold storage has the following problems: First, the comparison of nucleation supercooling degree during phase-change cold storage Larger, so that the evaporation temperature of the refrigeratio...

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Problems solved by technology

[0002]In recent years, with the rapid growth of my country's economic development, the problem of energy shortage has become more and more serious. This results in a huge waste of energy

Phase-change cold storage is an effective means to realize peak-shifting and valley-filling of power grids. The temperature of industrial cold storage is generally below 0°C. Under the current technical conditions, industrial cold storage has the following problems: First, the comparison of nucleation supercooling degree during phase-change cold storage Larger, so that the evaporation temperature of the refrigeration unit will be lowered, thus reducing the working efficiency of the refrigeration unit; second, the thermal conductivity of the cold storage material is not high, which makes the heat transfer efficiency during cold storage poor, and ultimately affects the entire cold storage efficiency.

At present, measures to enhance heat transfer of cold storage equipment mainly start with strengthening the heat transfer surface and manufacturing process, but are limited by the structure and manufacturing cost of cold storage equipment

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