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Phase change cold-accumulation material and preparation method thereof

A phase-change cold storage and nano-technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the phase transition temperature of sodium sulfate decahydrate, the hysteresis effect of phase transition temperature is large, and the long-term use cannot be achieved. The effect of repeated cycle decay is low, phase change temperature hysteresis is small, and production is easy

Inactive Publication Date: 2015-12-16
SUZHOU 3T COLD CHAIN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Phase change cold-accumulation material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Add 600kg of sodium sulfate decahydrate, 150kg of sodium bromide, 50kg of ammonium chloride, 15kg of borax, and 20kg of boric acid to the heating tank. After gradually melting, stir them evenly until all are melted. Add slowly at a stirring speed of 4000rpm 30kg of alumina, 20kg of nano-magnesium silicate, 40kg of nano-silica, supplement with 75kg of deionized water, stir evenly, keep at 40°C for one hour, and cool to room temperature to obtain a uniform paste, which is the phase change cold storage Material, the latent heat of phase change is 215KJ / kg, the temperature range of cooling phase change is 8.2~9.1℃, and the temperature range of heating phase change is 9.3~10.7℃.

Embodiment 2

[0030] Add 500kg of sodium sulfate decahydrate, 150kg of sodium bromide, 40kg of ammonium chloride, 10kg of borax, and 15kg of boric acid to the heating tank successively. After gradually melting, stir them evenly until all are melted. Add slowly at a stirring speed of 3000rpm 30kg of alumina, 20kg of nano-magnesium silicate, 40kg of nano-silica, supplement with 195kg of ionized water, stir evenly, keep at 40°C for one hour, cool to room temperature naturally to obtain a uniform paste, that is, the phase change cold storage material , The latent heat of phase change is 222KJ / kg, the temperature range of cooling phase change is 7.2~8.3℃, and the temperature range of heating phase change is 8.2~10.5℃.

Embodiment 3

[0032] Add 550kg of sodium sulfate decahydrate, 130kg of sodium bromide, 20kg of ammonium chloride, 30kg of borax, and 10kg of boric acid to the heating tank successively, and control the temperature of the mixture at about 60~70℃, stir until it is completely melted, at the stirring speed of Add 30kg alumina, 20kg nano-magnesium lithium silicate, 40kg nano-silica, add 170kg deionized water at 3500rpm and slowly add 170kg deionized water, stir well, keep it at 40℃ for one hour, then cool to room temperature to obtain a uniform paste, namely The phase change cold storage material is obtained, the latent heat of phase change is 201KJ / kg, the temperature range of cooling phase change is 6.9-8.1°C, and the range of temperature rising phase change is 8.0-9.8°C.

[0033] Observed at room temperature, the phase change cold storage materials of the above examples 1 to 3 are in a paste form, the phase change temperature is about 8~11℃, which meets the requirements of air conditioning system...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCY02E60/14
Inventor 杜海兵
Owner SUZHOU 3T COLD CHAIN TECH CO LTD
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