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Phase-changing energy-storage composite material for building and preparation process thereof

A technology of phase change energy storage and composite materials, which is applied in the field of phase change energy storage composite materials and its preparation, and can solve the problems of increasing the complexity of building structures, failure rates and pollution risks, complex environmental factors, and large usage of phase change materials, etc. problems, to achieve the effects of easy realization of industrialized production transformation, low cost of preparation process, and low cost of materials

Inactive Publication Date: 2007-03-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Durability of energy storage function: Compared with other application fields, the environmental factors of buildings are complex and harsh, and the durability requirements for building materials are relatively high. Therefore, many phase change energy storage that can be used well in other fields Materials, in the building environment, often expose shortcomings such as short life and easy aging, and cannot be used for a long time, lacking practical value. This is also the first phase-change energy storage experimental house in the United States-Dover House, which lasted less than a year. The main reason why there are no practical phase-change energy storage buildings yet
[0005] (2) Economic issues: The volume of buildings is very large, requiring a large amount of phase change materials to be used
The high cost is another important reason why the application of phase change energy storage materials in the construction field has stagnated
[0006] (3) Material applicability issues: For example, inorganic phase change materials, due to their corrosiveness, often need to be stored in the form of pipes or containers when used in buildings, which increases the complexity of building structures, failure rates and pollution risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Expanded clay ceramsite with a porosity of 75.6% is used as a porous medium for storing organic phase change materials. The maximum particle size of ceramsite is 20 mm, and its shape is approximately spherical. Paraffin wax with a melting point of 45° C. and a phase change enthalpy of 130 J / g was selected as the organic phase change material. The parameters of the vacuum soaking process are: the vacuuming time is 30 minutes, the vacuum pressure is 80kPa, the soaking time after vacuum removal is 30 minutes, and the soaking temperature is 100°C. The storage amount of the organic phase change material in the porous material is about 65%wt. The material of the sealing layer adopts polymer emulsion modified cement material, and its mixing ratio is: cement:polymer emulsion:water=100:20:17.5, the polymer emulsion adopts commercial styrene-butadiene rubber emulsion, and the solid content is 50%. The content of the organic phase change material in the phase change energy storag...

Embodiment 2

[0020] Expanded clay pottery sand with a porosity of 73.3% is used as a porous medium for storing organic phase change materials. The maximum particle size of the pottery sand is 3 mm and its shape is ellipsoid. Paraffin wax with a melting point of 45° C. and a phase change enthalpy of 130 J / g was selected as the organic phase change material. The parameters of the vacuum soaking process are as follows: the vacuuming time is 40 minutes, the vacuum pressure is 85kPa, the soaking time after vacuuming is 45 minutes, and the soaking temperature is 100°C. The storage capacity of the organic phase change material in the porous material is 60%wt. The material of the sealing layer is thickened polymer emulsion compound, the emulsion is commercial styrene-butadiene rubber emulsion, and the solid content after thickening is 75%. The content of the organic phase change material in the phase change energy storage aggregate after adding the sealing layer is 58%wt.

[0021] The phase chan...

Embodiment 3

[0023] Expanded clay ceramsite with a porosity of 75.6% is used as a porous medium for storing organic phase change materials. The maximum particle size of ceramsite is 20 mm, and its shape is approximately spherical. Butyl stearate with a melting point of 22°C and a phase change enthalpy of 128.5 J / g was selected as the organic phase change material. The parameters of the vacuum soaking process are: the vacuuming time is 30 minutes, the vacuum pressure is 88.5kPa, the soaking time after vacuum removal is 40 minutes, and the soaking temperature is 30°C. The storage capacity of the organic phase change material in the porous material is 67.5%wt. The material of the sealing layer adopts polymer emulsion modified cement material, and its mixing ratio is: cement:polymer emulsion:water=100:20:17.5, the polymer emulsion adopts commercial styrene-butadiene rubber emulsion, and the solid content is 50%. The content of the organic phase change material in the phase change energy stora...

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Abstract

The presnt invention relates to a phase-changed energy storage composite material for building. Said invention uses the air-setting or hydraulic binding materials of gypsum and cement, etc. as base body, in which the porous material aggregates of expansive clay, etc. are dispersed, and in the porous material aggregates the organic phase-change materials of paraffin wax or butyl stearate, etc. are stored. Said invention adopts the vacuum impregnation method to prepare phase-change energy-storing aggregate firstly, then utilizes the conventional method for making building material to prepare the invented phase-change energy-storing composite material.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a phase change energy storage composite material and a preparation method thereof. Background technique [0002] Utilizing the characteristics of energy absorption and energy release during the phase transition process of matter to realize energy storage and utilization is one of the active directions in many fields such as energy, materials, aerospace, textiles, electric power, medical instruments, and construction in recent years. Phase change energy storage has the advantages of high energy storage density, easy control of energy storage temperature and a wide range of options. At present, it has entered the stage of practical and commercialization in some fields, such as the solar thermal engine on the Freedom space station of the National Aeronautics and Space Administration (NASA). The power generation system uses LiF-CaF based 2 The heat storage system of high-...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 张东吴科如
Owner TONGJI UNIV
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