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Composite water-soluble hydrate phase change cold storage agent and preparation method thereof

A phase-change cool storage agent and hydrate technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of high subcooling degree and thermal stability of cool storage materials, reduce operating costs of cool storage, and achieve good thermal stability. , the effect of reducing supercooling

Active Publication Date: 2021-08-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects in the above-mentioned technologies, the present invention provides a water-soluble hydrate-like phase-change cool storage agent and its preparation method, which solves the technical problems of high supercooling degree of cold storage materials and thermal stability caused by multiple thermal cycles

Method used

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  • Composite water-soluble hydrate phase change cold storage agent and preparation method thereof
  • Composite water-soluble hydrate phase change cold storage agent and preparation method thereof

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preparation example Construction

[0023] A preparation method of a composite water-soluble hydrate-like phase-change cool storage agent of the present embodiment comprises the following steps:

[0024] Step 1: Weigh tetrabutylammonium fluoride, tetrahydrofuran, surfactant and water, mix according to the proportion of the components, place in a beaker to melt, and stir evenly to form a hydrate solution;

[0025] Step 2: Place the hydrate solution in a test tube, put the test tube in a low-temperature water bath at 0°C, and gradually cool down to solidification.

specific Embodiment 1

[0027] The composite water-soluble hydrate-like phase-change cold storage agent includes the following components: tetrabutylammonium fluoride, tetrahydrofuran, sodium lauryl sulfate and water, and the mass percentage of each component is: tetrabutylammonium fluoride 21%, tetrahydrofuran 14%, sodium lauryl sulfate 0.1%.

[0028] The specific preparation method is as follows:

[0029] 1) Weigh tetrabutylammonium fluoride, tetrahydrofuran, sodium lauryl sulfate and water, mix according to the proportion of the components, place in a beaker to melt, and stir to form a hydrate solution;

[0030] 2) Place the hydrate solution formulated in the first step in a test tube, put the test tube in a low-temperature water bath at 0°C, and gradually cool down to solidification.

[0031] The prepared cold storage agent is in the form of gel, the phase transition temperature is 280.2K, and the supercooling degree is about 5.4K.

specific Embodiment 2

[0033] The composite water-soluble hydrate-like phase-change cold storage agent includes the following components: tetrabutylammonium fluoride, tetrahydrofuran, sodium lauryl sulfate and water, and the mass percentage of each component is: tetrabutylammonium fluoride 21%, tetrahydrofuran 14%, sodium lauryl sulfate 0.5%.

[0034] The specific preparation method is as follows:

[0035] 1) Weigh tetrabutylammonium fluoride, tetrahydrofuran, sodium lauryl sulfate and water, mix according to the proportion of the components, place in a beaker to melt, and stir evenly;

[0036] 2) Place the well-proportioned hydrate solution in a test tube, put the test tube into a low-temperature water bath at 0°C, and gradually cool down to solidification.

[0037] The prepared cold storage agent is in the form of gel, the phase transition temperature is 279.8K, and the supercooling degree is about 3.3K.

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Abstract

The invention relates to a composite water-soluble hydrate phase change cold storage agent and a preparation method thereof. The cold storage agent is prepared by mixing the following components in percentage by mass: 21% of tetrabutylammonium fluoride, 14% of tetrahydrofuran, 0.1-0.5% of a surfactant and water. The surfactant is lauryl sodium sulfate or sodium dodecyl benzene sulfonate. The surfactant provides a crystal nucleus, so that the hydrate can be quickly crystallized near the crystal nucleus, the energy required by crystallization is reduced, the induction time of hydrate crystallization is shortened, and the degree of supercooling is reduced. The phase change temperature of the phase change cold storage agent ranges from 279.8 K to 280.8 K, and the supercooling degree of the phase change cold storage agent ranges from 3.3 K to 7.8 K; and the latent heat of phase change is about 213.3 kJ / kg. The phase change cold storage agent is low in supercooling degree, free of phase separation phenomenon, long in service life, simple in preparation process and suitable for the field of building central air conditioner cold storage.

Description

technical field [0001] The invention relates to the technical field of cold storage agents, in particular to a water-soluble hydrate-like hydrate phase-change cold storage agent and a preparation method thereof. Background technique [0002] my country's peak-to-valley power consumption ratio is higher than that of developed countries, threatening the security and stability of the power grid. Heating, ventilation and air-conditioning systems will account for more than 65% of building energy consumption, and air-conditioning and cooling energy consumption even accounts for 85% of the total building energy consumption during peak summer. In summer, the air-conditioning load is mainly concentrated in the daytime, and the demand for cooling at night is low. Using phase change material cold storage technology, the electricity price is used for cooling and storage at the low point of the night load, and the stored cooling capacity is released during the peak load period of the day...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 许波何雨柯
Owner SOUTHEAST UNIV