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Preparation method for high-performance room-temperature calcium-based composition phase-change energy storage material

A phase-change energy storage material and composition technology, applied in the field of materials, can solve the problems of expensive corrosion of potassium fluoride tetrahydrate, unsuitable energy storage materials, inconvenient preparation, etc., and achieve simple preparation methods, fewer types, and improved stability sexual effect

Active Publication Date: 2013-12-18
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common hydrated salts in this temperature range include manganese nitrate hexahydrate (25.8°C) and potassium fluoride tetrahydrate (18.5°C), but the raw materials of manganese nitrate hexahydrate are inconvenient to prepare and the price is relatively high; potassium fluoride tetrahydrate is expensive And strong corrosion, not suitable for energy storage materials

Method used

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  • Preparation method for high-performance room-temperature calcium-based composition phase-change energy storage material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a high-performance room temperature calcium-based composition phase-change energy storage material, the steps are:

[0026] (1) Dissolve anhydrous calcium chloride or its hydrate and water in a molar ratio of 1:6 to make calcium chloride solution, and dissolve anhydrous calcium bromide or its hydrate and water in a molar ratio of 1:6 to make Calcium bromide solution;

[0027] (2) get the calcium chloride solution prepared in step (1) without adding calcium bromide solution, directly take out calcium chloride solution 20g;

[0028] (3) Add 0.4g SrCl to the sample in step (2) 2 ·6H 2 O, keep stirring to make it evenly mixed;

[0029] (4) Pour the brine compound obtained in step (3) into a container for packaging.

[0030] The test results of this implementation are shown in Table 1, and the phase transition temperature of this component is 28°C.

Embodiment 2

[0032] (1) Dissolve anhydrous calcium chloride or its hydrate and water in a molar ratio of 1:6 to make calcium chloride solution, and dissolve anhydrous calcium bromide or its hydrate and water in a molar ratio of 1:6 to make Calcium bromide solution;

[0033] (2) get the calcium chloride solution prepared in step (1) and add calcium bromide solution, be mixed with 20g of saline compound containing 10% calcium bromide solution;

[0034] (3) Add functional additives 0.4g KBr and 0.2g KCl respectively to the sample in step (2) to make its performance more stable, add nucleating agent 0.2g SrCl 2 ·6H 2 O and 0.2g Ba(OH) 2 ·8H 2 O, keep stirring to make it evenly mixed;

[0035] (4) Pour the brine compound obtained in step (3) into a container for packaging.

[0036] The test results of this implementation are shown in Table 1, and the phase transition temperature of this component is 24°C.

Embodiment 3

[0038] (1) Dissolve anhydrous calcium chloride or its hydrate and water in a molar ratio of 1:6 to make calcium chloride solution, and dissolve anhydrous calcium bromide or its hydrate and water in a molar ratio of 1:6 to make Calcium bromide solution;

[0039] (2) get the calcium chloride solution prepared in step (1) and add calcium bromide solution, be mixed with 20g of saline compound containing 20% ​​calcium bromide solution;

[0040] (3) Add functional additives 0.4g KBr and 0.2g KCl respectively to the sample in step (2) to make its performance more stable, add nucleating agent 0.2g SrCl 2 ·6H 2 O and 0.2g Ba(OH) 2 ·8H 2 O, keep stirring to make it evenly mixed;

[0041] (4) Pour the brine compound obtained in step (3) into a container for packaging.

[0042] The test results of this implementation are shown in Table 1, and the phase transition temperature of this component is 20°C.

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Abstract

The invention relates to a preparation method for a high-performance room-temperature calcium-based composition phase-change energy storage material. The preparation method includes the following steps: (1) calcium chloride or hydrate of the calcium chloride is dissolved in water according to the molar ratio of 1:6, so that calcium chloride solution is prepared, and the calcium chloride solution is placed under the constant temperature of 30 DEG C to 40 DEG C for later use; (2) calcium bromide or hydrate of the calcium bromide is dissolved in water according to the molar ratio of 1:6, so that calcium bromide solution is prepared, and the calcium bromide solution is placed under the constant temperature of 30 DEG C to 40 DEG C for later use; (3) the calcium chloride solution and the calcium bromide solution are mixed according to a proportion to form mixed solution, and are constantly stirred, so that the calcium chloride solution and the calcium bromide solution are sufficiently and uniformly mixed into the form of fluid; (4) nucleating agent and functional additive are added into the mixed solution, and the prepared brine compound is filled into a container and packaged. The low-temperature phase-change material prepared by the invention has the advantages that: the price is low, the latent heat of phase change is 160J / g to 200J / g, the phase-change temperature is between 17 DEG C and 28 DEG C, repeated tests prove that the performance of the phase-change energy storage material is stable, and phase separation does not exist. The phase-change energy storage material can be widely applied to energy efficiency in buildings, heating and temperature regulation in interior decoration, solar energy utilization, energy efficiency in vegetable greenhouses and other aspects.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a phase-change energy storage material, in particular to a preparation method of a high-performance room-temperature calcium-based composite phase-change energy storage material. Background technique [0002] In the process of energy conversion and utilization, there are often contradictions between supply and demand that cannot be effectively matched in time and space, such as peak-to-valley differences in power loads caused by electricity consumption, intermittent supply of solar energy, wind energy, and ocean energy, etc. Through the design and implementation of thermal energy storage technology, the contradiction between energy supply and demand can be effectively alleviated or resolved, and phase change materials are the core materials for thermal energy storage. [0003] Phase change materials can absorb heat (cold) from the environment during the phase change process, and release he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 邓天龙高道林郭亚飞王士强闫东军余晓平
Owner TIANJIN UNIV OF SCI & TECH
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