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Phase-change material for storing day/night temperature difference energy and preparation method thereof

A technology of phase change material and temperature difference between day and night, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of supercooling, unable to guarantee the release of latent heat from melting point, etc., to improve stability, improve supercooling phenomenon, raw material price Inexpensive effect

Inactive Publication Date: 2011-06-01
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the prepared CaCl 2 ·6H 2 O will be seriously overcooled when cooling, and the supercooling degree can reach 12°C, which makes it impossible to guarantee the release of stored latent heat at the melting point

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Prepare materials, select chemically pure anhydrous calcium chloride to grind, and prepare a supersaturated solution at 40°C according to its solubility curve;

[0017] (2) Put the calcium chloride supersaturated solution into a constant temperature cold water bath at 10°C until it crystallizes completely, pour out about 1g of the residual solution, and dry it at low temperature to obtain CaCl 2 ·6H 2 O standby;

[0018] (3) Weigh 3g of SrCl 2 ·6H 2 O, SrCl 2 ·6H 2 O add a small amount of water and stir until completely dissolved;

[0019] (4) Weigh 30g CaCl 2 ·6H 2 O crystals, which were mixed with dissolved SrCl 2 ·6H 2 O and 1g sodium hydroxymethyl cellulose are put into the glass test tube of diameter 25 millimeters and mix evenly;

[0020] (5) Heat in a constant temperature water bath at 40-50°C with constant stirring until the mixture is completely dissolved into a liquid.

[0021] (6) The dissolved material is placed in a cold water bath for coolin...

Embodiment 2

[0026] (1) Prepare materials, select chemically pure anhydrous calcium chloride to grind, and prepare a supersaturated solution at 40°C according to its solubility curve;

[0027] (2) Put the calcium chloride supersaturated solution into a constant temperature cold water bath at 10°C until it crystallizes completely, pour out about 1g of the residual solution, and dry it at low temperature to obtain CaCl 2 ·6H 2 O standby;

[0028] (3) Weigh 6g of SrCl 2 ·6H 2 O, SrCl 2 ·6H 2 O add a small amount of water and stir until completely dissolved;

[0029] (4) Weigh 30g CaCl 2 ·6H 2 O crystals, which were mixed with dissolved SrCl 2 ·6H 2 O and 1g sodium hydroxymethyl cellulose are put into the glass test tube of diameter 25 millimeters and mix evenly;

[0030] (5) Heat in a constant temperature water bath at 40-50°C with constant stirring until the mixture is completely dissolved into a liquid.

[0031] (6) The dissolved material is placed in a cold water bath for coolin...

Embodiment 3

[0036] (1) Prepare materials, select chemically pure anhydrous calcium chloride to grind, and prepare a supersaturated solution at 40°C according to its solubility curve;

[0037] (2) Put the calcium chloride supersaturated solution into a constant temperature cold water bath at 10°C until it crystallizes completely, pour out about 1g of the residual solution, and dry it at low temperature to obtain CaCl 2 ·6H 2 O standby;

[0038] (3) Weigh 9g of SrCl 2 ·6H 2 O, SrCl 2 ·6H 2 O add a small amount of water and stir until completely dissolved;

[0039] (4) Weigh 30g CaCl 2 ·6H 2 O crystals, which were mixed with dissolved SrCl 2 ·6H 2 O and 1g sodium hydroxymethyl cellulose are put into the glass test tube of diameter 25 millimeters and mix evenly;

[0040] (5) Heating and stirring continuously in a constant temperature water bath at 40-50°C until the mixture is completely dissolved into a liquid;

[0041] (6) The dissolved material is placed in a cold water bath for ...

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Abstract

The invention discloses a phase-change material applicable to storing day / night temperature difference energy and a preparation method thereof. The phase-change material is prepared by mixing CaCl2.6H2O as a storage medium with added SrCl2.6H2O and carboxymethylcellulose sodium. The preparation method comprises the steps of: respectively weighing three materials in proportion and mixing at an average valence; and heating and stirring in a constant-temperature water bath at the temperature of 40 DEG C till a mixture is completely dissolved to form a transparent liquid. In the invention, the CaCl2.6H2O has the advantages of low melting point, large heat storage capacity, safety, no toxicity and low cost and is easy to obtain. The SrCl2.6H2O is favorable for obviously reducing the subcooled temperature of the CaCl2.6H2O, and the carboxymethylcellulose sodium enables the heat storage performance of the CaCl2.6H2O to keep stable after the CaCl2.6H2O is repeatedly circulated, and can be utilized for a plurality of times. In addition, the preparation method is simple, and raw materials are low in cost and easy to obtain. The phase-change material has the phase-change temperature of 28 DEG C, and the phase-change latent heat of more than 100kJ / kg.

Description

Technical field: [0001] The invention relates to a phase change material suitable for storing diurnal temperature difference energy and a preparation method thereof, in particular to a phase change material with a phase change temperature of about 28°C and a preparation method thereof. Background technique: [0002] The diurnal temperature difference energy is a kind of natural cooling energy, and the natural cooling energy (Nature Cool Energy) refers to the low temperature difference and low temperature heat energy that naturally exists in the normal temperature environment. In fact, the feeling of cold energy is relative, no matter the temperature is high or low, the existence of temperature difference means energy. Due to the infinite ability of nature to maintain the ambient temperature, it is a potentially huge amount of low-grade energy. Most of China is in the continental climate zone, where the diurnal and seasonal changes in temperature are very large. Compared wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 章学来施敏敏于树轩林原培于美张利华戴祚晟
Owner SHANGHAI MARITIME UNIVERSITY
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