High thermal conductivity light-heat converting compound phase-changeable heat storage material for solar water heater and preparation method thereof

A technology of solar water heaters and composite phase change, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problem of inability to meet the requirements of high heat transfer rate of phase change materials, poor thermal conductivity of composite phase change materials, and poor thermal conductivity and other problems, to achieve the effect of reducing technical complexity, high latent heat of phase change, and good thermal conductivity

Inactive Publication Date: 2019-01-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the use of sodium acetate trihydrate as a phase change material, it faces three problems: supercooling, poor thermal conductivity, leakage
However, the SiO used in this invention 2 Poor thermal conductivity, the prior art usually uses SiO 2 Used as thermal insulation filler and thermal insulation material, such as Chinese invention patent application ...

Method used

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  • High thermal conductivity light-heat converting compound phase-changeable heat storage material for solar water heater and preparation method thereof

Examples

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Embodiment 1

[0033] A method for preparing a high thermal conductivity photo-thermal conversion composite phase change heat storage material for solar water heaters, comprising the following steps: weighing 75g of sodium acetate trihydrate and mixing with 0.3g of disodium hydrogen phosphate, heating to 75°C and keeping it warm 3h. Subsequently, 14 g of expanded graphite was added, mechanically stirred for 1 h at a rotational speed of 100 r / min, and a uniform sodium acetate trihydrate / expanded graphite mixture was obtained. Control the stirring speed and temperature constant, add 10g nano-CuS while stirring, continue to stir for 2h, after cooling to room temperature, use a mold to press the mixture to a density of 1g / cm 3 A block of high thermal conductivity light-to-heat conversion composite phase change heat storage material is obtained.

Embodiment 2

[0035]A method for preparing a high thermal conductivity light-to-heat conversion composite phase change heat storage material for solar water heaters, comprising the following steps: weighing 65g of sodium acetate trihydrate and mixing it with 2g of aluminum nitride, heating to 60°C and keeping it warm for 2 hours. Then add 24g of expanded graphite, and mechanically stir for 2h at a speed of 300r / min to obtain a uniform sodium acetate trihydrate / expanded graphite mixture. Control the stirring speed and temperature constant, add 8g nano-graphite powder while stirring, continue to stir for 3h, after cooling to room temperature, use the mold to press the mixture to a density of 2g / cm 3 A block of high thermal conductivity light-to-heat conversion composite phase change heat storage material is obtained.

Embodiment 3

[0037] A method for preparing a high thermal conductivity photo-thermal conversion composite phase change heat storage material for solar water heaters, comprising the following steps: weighing 80g of sodium acetate trihydrate and mixing it with 5g of sodium bromide dihydrate, heating to 80°C and keeping it warm 1h. Subsequently, 9 g of expanded graphite was added, mechanically stirred for 3 h at a rotational speed of 600 r / min, and a uniform sodium acetate trihydrate / expanded graphite mixture was obtained. Control the stirring speed and temperature constant, add 5g of carbon nanotubes while stirring, continue to stir for 4h, after cooling to room temperature, use a mold to press the mixture to a density of 0.5g / cm 3 A block of high thermal conductivity light-to-heat conversion composite phase change heat storage material is obtained.

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Abstract

The invention discloses a high thermal conductivity light-heat converting compound phase-changeable heat storage material for a solar water heater and a preparation method thereof. The preparation method comprises the following steps: mixing sodium acetate trihydrate with a nucleating agent, heating to 60-80 DEG C and keeping temperature for 1-3h; adding expanded graphite and uniformly stirring, thereby acquiring a uniform sodium acetate trihydrate/expanded graphite mixture; adding a nanometer light-heat converting material while stirring under the temperature of 60-80 DEG C, and continuouslystirring for 2-4h; cooling to room temperature and then pressing the stirred mixed material into a block in density of 0.5-2g/cm<3>, thereby acquiring the high thermal conductivity light-heat converting compound phase-changeable heat storage material. The high thermal conductivity light-heat converting compound phase-changeable heat storage material not only has ideal heat storage density and heatconductivity but also can effectively convert luminous energy into heat energy and has a heat conductivity coefficient of 2.27-3.52W/(m.K) and a light-heat converting rate of 86.6-91.0%.

Description

technical field [0001] The invention relates to the field of phase change heat storage materials, in particular to a high thermal conductivity photo-thermal conversion composite phase change heat storage material for solar water heaters and a preparation method thereof. Background technique [0002] A solar water heater is a device that converts solar energy into heat energy, heating water from low temperature to high temperature, and meeting people's demand for hot water in daily life and production. Solar water heaters currently on the market mainly consist of heat collectors, heat preservation water tanks, control systems, connecting pipes and other parts. The heat generated by the collector is stored in water through heat exchange. However, water has a low heat storage density and generally requires larger tanks to meet demand. Simultaneously, this water heater also has the shortcomings of fouling, the water outlet temperature is not constant, and the water quality of ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 袁文辉肖强强李莉方耀兵
Owner SOUTH CHINA UNIV OF TECH
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