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Coconut shell carbon-based composite phase change heat-storage material and preparation method thereof

A heat storage material and composite phase change technology, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of reducing the crystallinity of phase change materials, reducing the energy storage density of phase change materials, and high material cost, and achieving high Thermal conductivity, realization of portability, and effect of increasing load capacity

Inactive Publication Date: 2018-04-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal porous materials can improve the thermal conductivity of phase change materials very well, but metal-based porous materials will increase the quality of composite phase-change heat storage materials, affecting the portability of tankless solar water heaters, and the large thermal expansion of metal-based porous materials It will also lead to the problem of "burst"; although clay minerals in non-metallic porous materials can prevent the leakage of phase change materials, they cannot improve the thermal conductivity of composite phase change heat storage materials; graphene can effectively improve the thermal conductivity of composite materials. thermal conductivity and can prevent phase change leakage, but graphene will reduce the crystallinity of phase change materials, which will lead to a decrease in the energy storage density per unit mass of phase change materials. Not only that, the preparation process of graphene is cumbersome and the cost of materials is high. The water heater is poor in practicality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 30 parts by weight of 80-100 mesh coconut shell charcoal and 60 parts by weight of H 2 o 2 The solution was placed in a container, stirred and mixed, placed in a microwave oven, microwaved at 700 W for 1 min, taken out and cooled, filtered and cleaned, and dried in a constant temperature oven at 105°C for 12 h to obtain hydroxylated coconut Shell charcoal: place hydroxylated coconut shell charcoal at the bottom of the reactor, weigh 100 parts by weight of stearic acid and evenly cover the matrix of hydroxylated coconut shell charcoal, vacuumize until the pressure in the container is -0.1 MPa, and place it under heating After maintaining 25min at 80°C in a type ultrasonic cleaner, stop vacuuming, return the air to the container, ultrasonically treat it for 5 minutes, take out the mixture in the container, cool, and heat filter at 90°C for 24 h to obtain the coconut Shell carbon based composite phase change heat storage material.

[0020] The performance parameters of t...

Embodiment 2

[0022] 30 parts by weight of 60-80 mesh coconut shell charcoal and 50 parts by weight of H 2 o 2 The solution was placed in a container, stirred and mixed, placed in a microwave oven, and microwaved at a power of 600 W for 3 minutes, taken out and cooled, filtered and cleaned, and dried in a constant temperature oven at 105 ° C for 12 hours to obtain hydroxylated coconut shell charcoal; put the hydroxylated coconut shell charcoal at the bottom of the reactor, weigh 80 parts by weight of stearic acid and evenly cover the hydroxylated coconut shell charcoal matrix, vacuumize the container until the pressure is -0.1 MPa, and place it in a heating type After maintaining 30 min at 75°C in the ultrasonic cleaner, stop vacuuming, return the air to the container, ultrasonically treat for 5 min, take out the mixture in the container, cool, and heat filter for 24 h at 85°C to obtain the coconut Shell carbon based composite phase change heat storage material.

[0023] The performance p...

Embodiment 3

[0025] 30 parts by weight of 40-60 mesh coconut shell charcoal and 40 parts by weight of mass fraction are 30% H 2 o 2 The solution was placed in a container, stirred and mixed, placed in a microwave oven, and microwaved at a power of 500 W for 5 min, taken out and cooled, filtered and cleaned, and dried in a constant temperature oven at 105°C for 12 h to obtain hydroxylated coconut Shell charcoal: put the hydroxylated coconut shell charcoal at the bottom of the reactor, weigh 60 parts by weight of stearic acid and evenly cover the hydroxylated coconut shell charcoal matrix, vacuumize the container until the pressure is -0.1 MPa, and place it under heating After maintaining at 85°C for 20 minutes in a type ultrasonic cleaner, stop vacuuming, return the air to the container, ultrasonicate for 5 minutes, take out the mixture in the container, cool, and heat filter at 80°C for 24 hours to obtain the described Coconut shell carbon-based composite phase change heat storage materia...

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Abstract

The invention discloses a coconut shell carbon-based composite phase change heat-storage material and a preparation method thereof. The heat-storage material is obtained by using H2O2 and microwave totreat coconut shell carbon and then compounding the treated coconut shell carbon with stearic acid. The material has a heat storage capacity of 121-153 J / g and a thermal conductivity of 0.81-0.94 W / (m*K). The raw materials of the heat-storage material are low in price and easy to get, the production technology is simple, the preparation process is green and environmentally friendly, and the prepared heat-storage material does not easily cause leakage and does not have a tube burst phenomenon when used in a tankless solar water heater, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of heat storage materials, and in particular relates to a coconut shell carbon-based composite phase change heat storage material and a preparation method thereof. Background technique [0002] As a new type of solar water heater, the tankless solar water heater has received widespread attention. It puts the phase change heat storage material in the vacuum heat collecting tube to replace the traditional water tank to store heat. , and can be installed on the balcony, the outer edge of the window, and integrated with the building. However, phase change materials have problems such as poor thermal conductivity and volume expansion during phase change, which can easily lead to "explosive tube" leakage in vacuum tubes, which seriously affect their applications. [0003] At present, metal porous materials and non-metal porous materials (clay minerals, graphene, etc.) are mainly used as supporting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李传常谢宝珊陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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