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Phase-change thermal energy-storage material applicable to heat-pump water heater and preparation method thereof

A technology of phase change heat storage materials and heat pump water heaters, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as unsuitable for long-term use, crystal deposition, instability, etc., and achieve large latent heat value of phase change and high performance Stable, small volume expansion effect

Inactive Publication Date: 2015-04-08
MAANSHAN NBWAVE HEAT ENERGY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual application process, some phase change materials disclosed in the prior art are prone to crystallization and deposition after repeated heat absorption and heat release, resulting in instability, and are not suitable for long-term use.

Method used

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  • Phase-change thermal energy-storage material applicable to heat-pump water heater and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: The phase-change heat storage material in this example includes a mixture of the following components and weight ratios: 20 parts of stearic acid, 35 parts of palmitic acid, 15 parts of lauric acid, 20 parts of paraffin, and 4 parts of thermally conductive carbon nanofibers part, the addition of expanded graphite is 15% of the paraffin weight, and the addition of NaCl (sodium chloride) is 5.5% of the total weight of the four components of stearic acid, palmitic acid, lauric acid and paraffin. It is prepared by a sol-gel process, as follows: firstly heat the paraffin, and after it is completely melted, add expanded graphite and mix in proportion to form a mixture of paraffin and expanded graphite; at the same time, stearic acid, palmitic acid and lauric acid are separately Melt, mix according to the proportion to form a eutectic mixture of three components and heat to a completely molten state, then mix with paraffin expanded graphite and add a certain proporti...

Embodiment 2

[0030] Embodiment 2: The phase-change heat storage material in this embodiment includes a mixture of the following components and weight ratios: 25 parts of stearic acid, 30 parts of palmitic acid, 20 parts of lauric acid, 25 parts of paraffin, and 4 parts of heat-conducting carbon nanofibers part, the addition of expanded graphite is 18% of the paraffin weight, and the addition of NaCl is 5% of the total weight of the four components of stearic acid, palmitic acid, lauric acid and paraffin. The preparation method is the same as in Example 1.

Embodiment 3

[0031] Embodiment 3: The phase change heat storage material in this embodiment includes a mixture of the following components and weight ratio: 30 parts of stearic acid, 40 parts of palmitic acid, 10 parts of lauric acid, 22 parts of paraffin, 5 parts of thermally conductive carbon nanofibers part, the addition of expanded graphite is 20% of the paraffin weight, and the addition of NaCl is 6% of the total weight of the four components of stearic acid, palmitic acid, lauric acid and paraffin. The preparation method is the same as in Example 1.

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Abstract

The invention provides a phase-change thermal energy-storage material applicable to a heat-pump water heater. The phase-change thermal energy-storage material comprises, by weight, 20 to 30 of stearic acid, 30 to 40 of palmitic acid, 10 to 20 of lauric acid, 20 to 30 of paraffin, 3 to 5 of a carbon nanofiber, expandable graphite and NaCl, wherein the additive amount of the expandable graphite accounts for 12 to 20% of the weight of the paraffin, and the additive amount of NaCl accounts for 3 to 8% of the total weight of the stearic acid, the palmitic acid, the lauric acid and the paraffin. The invention further discloses a preparation method for the phase-change thermal energy-storage material. Compared with the prior art, the prepared phase-change thermal energy-storage material provided by the invention has the advantages of a great potential heat value of phase change, an appropriate phase-change temperature, great thermal energy-storage density, a small volume expansion ratio, stable performance, no toxicity, no pollution, no corrosion to metals, easily available raw materials, easy preparation, etc.

Description

technical field [0001] The invention relates to a phase change heat storage material, in particular to a phase change heat storage material applied to a water heater. The invention also relates to a preparation method of the phase change heat storage material. Background technique [0002] Phase change material (PCM) is a new type of heat storage medium, which can store and release energy during its reversible phase change process, and has the advantages of large latent heat of phase change, high heat storage density, and low cost, which can effectively solve the problem of solar energy. Utilize, heat pump water heaters and the energy supply and demand time and space mismatch problems in the process of heat pump water heater and waste heat recovery, and then improve energy utilization. It has been widely used in technical fields such as water heaters and air conditioners. As the application number is 98114695.3, the Chinese invention patent application publication "Electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 李漫汪吉平颜世峰吴剑峰曹伟
Owner MAANSHAN NBWAVE HEAT ENERGY SCI
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