Low-temperature phase change cold storage material

Abstract

The invention discloses a low-temperature phase-change cold storage material, and relates to an organic-inorganic composite phase-change material, which comprises anhydrous calcium chloride, distilled water, glycerol and barium hydroxide octahydrate, and the composite phase-change material contains the following components in percentage by mass: 42.65% of anhydrous calcium chloride, 41.5% of distilled water, 14.85% of glycerol and 1% of barium hydroxide octahydrate. The phase change temperature of the composite phase change material provided by the invention is 11.8 DEG C, the supercooling degree is 1.2 DEG C, the phase change enthalpy value is 112.86 J / g, and the phase change process is reversible and can be repeatedly used. The preparation method of the material comprises the following steps: weighing anhydrous calcium chloride and distilled water with corresponding mass, oscillating by using an ultrasonic oscillator until no obvious solid particles exist in the liquid to obtain an intermediate, sealing the intermediate by using a preservative film, standing to room temperature, adding glycerol and barium hydroxide octahydrate with corresponding mass into the intermediate, and uniformly stirring to obtain the material. And finally, stirring for 10 minutes by using a constant-temperature magnetic stirrer, and then packaging.

Description

technical field [0001] The invention relates to the field of new energy energy storage, in particular to a low-temperature phase change cold storage material. Background technique [0002] Energy consumption is serious in the 21st century. In order to solve the energy pressure, my country attaches great importance to the development of renewable energy. Phase change material energy storage technology in renewable energy has a good development prospect. People's daily air-conditioning power consumption accounts for more than 50% of daily power consumption, so it is very necessary to use phase-change energy storage methods to reduce the energy consumption of air-conditioning. This technology uses phase change materials to store cold electricity at the valley point and release it at the peak point, solving the problem of mismatch between supply and demand, and can reduce the use of electricity and save some energy. [0003] Phase change materials are classified according to ph...

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Problems solved by technology

[0004] Zou Ting of South China University of Technology used calcium chloride hexahydrate as the substrate, urea as the temperature regulator, cesium chloride hexahydrate as the nucleating agent, and MC as the thickener to synthesize a new type of calcium chloride hexahydrate-based compound Phase change energy storage material, the new composite phase change material has a phase change temperature of 11.62°C and a phase change latent heat value of 127.2J / g, which can be applied to cold storage of air conditioners, but the material has a complex ratio and obvious phase separation Layer phenomenon, thickener needs to be added, the stability of this new composite phase change material still needs to be verified

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