Phase change cold-accumulation material and preparation method thereof

Abstract

The invention discloses a phase change cold-accumulation material and a preparation method thereof. The phase change cold-accumulation material is prepared from, by mass, 50-60% of sodium sulfafe decahydrate, 10-15% of sodium bromide, 2-5% of ammonium chloride, 3% of aluminum oxide, 1-3% of sodium borate, 1-2% of boric acid, 4% of nanometer silicon dioxide, 2% of nanometer magnesium silicate and the balance deionized water. The preparation method comprises the steps of sequentially adding the sodium sulfafe decahydrate, the sodium bromide, the ammonium chloride, the sodium borate and the boric acid into a heating tank provided with a blender, conducting mixing and uniform stirring, controlling the mixture temperature within the range from 60 DEG C to 70 DEG C, conducting stirring till the mixture is molten completely, adding the aluminum oxide, the nanometer silicon dioxide and the nanometer magnesium silicate in the high-speed stirring process, replenishing the balance deionized water, stirring the mixture uniform, preserving the temperature for one hour at the temperature of 40 DEG C, cooling the mixture to be room temperature, and obtaining the uniform plasty fluid form phase change cold-accumulate material. Compared with the prior art, the phase change cold-accumulate material has the advantages of being high in potential heat value, stable in system, few in phase-change temperature hysteresis phenomenon, low in repeated cycling degradation and the like, raw materials are easy to obtain, the production is easy to conduct, the safety and nontoxicity are achieved, and the material has practical value in the field of heating, ventilation and air conditioning (HVAC).

Description

Technical field [0001] The invention relates to the technical field of cold storage, in particular to a phase change cold storage material and a preparation method thereof. Background technique [0002] Phase-change cold storage technology is widely used in solar energy utilization, civil and industrial refrigeration, as well as energy-saving in the process industry, and regional energy cogeneration systems. Especially for air conditioning systems (HVAC), the phase-change temperature is in the range of 8°C to 11°C. The phase change cold storage technology can replace part of the existing water cold storage and ice cold storage technologies. While making full use of peak and valley electricity, it greatly improves the cycle coefficient of performance (COP) of screw refrigeration units. Inorganic phase change cold storage materials are the most promising materials for large-capacity cold storage because of their low price and easy availability of raw materials. However, existing in...

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Problems solved by technology

Inorganic phase change cold storage materials are the most promising materials for large-capacity cold storage due to their low price and easy availability of raw materials. However, existing inorganic phase change cold storage materials often have problems such as low cold storage capacity, stratification, and irreversible crystallization that affect their use.

Patent USP4689164 and EP0620261 etc. have also reported adopting soluble inorganic salt as melting point control agent to reduce the phase transition temperature of sodium sulfate decahydrate; In the cold storage system, the addition of sodium carboxymethyl cellulose leads to a large phase change temperature hysteresis effect, and it is easy to be corrupted and degraded, so it cannot be used for a long time

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