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Phase change material applied to water heater and preparation method thereof

A technology of phase change materials and water heaters, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of crystal deposition, unsuitable for long-term use, instability, etc., achieve stable performance, improve heat storage and heat storage efficiency, The effect of small volume expansion rate

Inactive Publication Date: 2010-02-17
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The phase change material in this embodiment includes a mixture of the following components and weight ratios: 40 parts of asphalt, 60 parts of paraffin, 6.5 parts of expanded graphite, and the addition of NaCl is 5.5% of the weight of the asphalt. It is prepared by a sol-gel process, specifically as follows: first heat the asphalt and paraffin separately, and after they are completely melted, mix them in proportion to form a eutectic mixture of asphalt and paraffin; then heat the eutectic mixture of asphalt and paraffin to In a completely molten state, it is then mixed with graphite and a certain proportion of NaCl is added to form a phase change material for water heaters.

Embodiment 2

[0019] Embodiment 2: The phase change material in this embodiment includes a mixture of the following components and weight ratio: 30 parts of asphalt, 70 parts of paraffin, 8 parts of expanded graphite, and the addition of NaCl is 8% of the weight of the asphalt. The preparation method is the same as in Example 1.

Embodiment 3

[0020] Embodiment 3: The phase change material in this embodiment includes a mixture of the following components and weight ratio: 50 parts of asphalt, 50 parts of paraffin, 5 parts of expanded graphite, and the addition of NaCl is 3% of the weight of the asphalt. The preparation method is the same as in Example 1.

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Abstract

The invention discloses a phase change material applied to a water heater, which is characterized by comprising the following components in percentage by weight: 30-50 of pitch, 50-70 of paraffin, 5-8of graphite and NaCl with the adding content of 3-8 percent of pitch in weight. The invention also discloses a preparation method of the phase change material. Compared with the prior art, the invention has the advantages that the pitch and the graphite mainly play roles of conducting heat and maintaining all the components to be even; the NaCl is used for preventing crystallization, and the paraffin has the effect of storing heat; and the obtained phase change material has the advantages of large phase change potential heat value and heat storage density, proper phase change temperature, small volume expansion ratio, stable performance, no poison and pollution, no corrosion on metal objects, easy acquisition of raw materials, easy manufacture, and the like by the mutual synergetic effectof the four substances.

Description

technical field [0001] The invention relates to a phase change material, in particular to a phase change material applied to a water heater, and also discloses a preparation method of the phase change 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 "Electric Water Heater Utilizing Phase-change-Based Thermal...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 汪吉平颜世峰吴剑峰吴雷
Owner MAANSHAN NBWAVE HEAT ENERGY SCI
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