Unlock instant, AI-driven research and patent intelligence for your innovation.

A high thermal conductivity composite hydrated salt phase change heat storage material and its preparation method

A phase change heat storage material and hydrated salt technology, which are applied in the field of high thermal conductivity composite hydrated salt phase change heat storage materials and their preparation fields, can solve the problems of lower use temperature range, lower heat storage capacity, difficulty in charging and discharging heat, etc. Thermal conductivity, corrosion reduction, low cost effect

Active Publication Date: 2020-12-08
NARI TECH CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use of crystalline hydrated salts, three problems need to be solved: one is the phenomenon of phase separation during the phase transition process, resulting in a decrease in heat storage capacity; The conductivity is too low (below 0.5W / m·K), which makes it difficult to charge and discharge heat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high thermal conductivity composite hydrated salt phase change heat storage material and its preparation method
  • A high thermal conductivity composite hydrated salt phase change heat storage material and its preparation method
  • A high thermal conductivity composite hydrated salt phase change heat storage material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A high thermal conductivity composite salt hydrate phase change heat storage material, the preparation method is: weighing 6g Mg(NO 3 ) 2 ·6H 2 O, 4gMgCl 2 ·6H 2 O and 0.05g Na 2 B 4 o 7 10H 2 O, placed in a powder machine and stirred evenly, the stirring time is 20s. Weigh 1.7g of fumed silica and add it into the powder machine, and stir for 20s. Put the uniformly mixed compound salt into a sealed bag and heat it in a blast oven until it is completely melted, and the temperature of the oven is 70°C. After the compound salt is cooled, crush it with a powder machine, add 5g of graphite and stir evenly, and the stirring time is 20s. The obtained compound salt is pressed into shape with a press, the pressure is 20MPa, and the holding time is 60s.

Embodiment 2

[0043] A high thermal conductivity composite salt hydrate phase change heat storage material, the preparation method is: weighing 6g Mg(NO 3 ) 2 ·6H 2 O, 4gMgCl 2 ·6H 2 O and 0.05g Na 2 B 4 o 7 10H 2O, placed in a powder machine and stirred evenly, the stirring time is 20s. Weigh 1.7g nano-carbon spheres into the powder machine, and stir for 20s. Put the uniformly mixed compound salt into a sealed bag and heat it in a blast oven until it is completely melted, and the temperature of the oven is 70°C. After the compound salt is cooled, crush it with a powder machine, add 5g of aluminum nitride and stir evenly, and the stirring time is 20s. The obtained compound salt is pressed into shape with a press, the pressure is 20MPa, and the holding time is 60s.

Embodiment 3

[0045] A high thermal conductivity composite hydrated salt phase change heat storage material, the preparation method is: weighing 10g CH 3 COONa·3H 2 O, 0.05g Na 2 HPO 4 12H 2 O and 0.3g sodium carboxymethyl cellulose, placed in a powder machine and stirred evenly, the stirring time was 15s. Weigh 2g of carbon nanospheres and add them to the powder maker, and stir for 20s. Put the uniformly mixed compound salt into a sealed bag and heat it in a blast oven until it is completely melted, and the temperature of the oven is 65°C. After the compound salt is cooled, crush it with a powder machine, add 5g of graphite and stir evenly, and the stirring time is 20s. The obtained compound salt is pressed into shape with a press, the pressure is 25MPa, and the holding time is 60s.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
particle diameteraaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-thermal conductivity composite hydrated salt phase-change heat storage material and a preparation method thereof. The high-thermal conductivity composite hydrated salt phase-change heat storage material comprises the following raw materials in percentage by weight: 60-75 percent of hydrated salt, 0.5-5 percent of an additive, 10-20 percent of an adsorbent and 10-30 percent of a heat conduction agent. The preparation method comprises the following steps: during preparation, weighing the hydrated salt and the additive according to the formula ratio to uniformly stir, then adding the adsorbent, uniformly mixing through a pulverizing machine, then sealing and putting in a blast oven to heat till complete fusion; and pulverizing with the pulverizing machine afterfooling, adding the heat conduction agent to uniformly stir and press-molding. The high-thermal conductivity composite hydrated salt phase-change heat storage material and the preparation method thereof disclosed by the invention has the benefits that by selecting the proper ratios of the adsorbent and the heat conduction agent, the cycle stability and the thermal conductivity of the composite material are effectively enhanced; after 100 cycles, the heat storage performance of the material is almost attenuated, and the heat conduction rate can reach above 9 W / m.K.

Description

technical field [0001] The invention relates to a high thermal conductivity composite hydrated salt phase change heat storage material and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] With the increasingly tense energy supply and the increasing pressure of environmental protection, phase change materials have been highly valued by people because of their unique characteristics, and have been applied in more and more fields, such as residential heating, photothermal storage, waste heat recovery, building insulation, etc. . The basic principle of phase change energy storage technology is to store energy through the isothermal phase change process of materials, and then release the energy for use when needed. It is an important means to solve the mismatch between energy space and time. [0003] In the phase change material system, crystalline hydrated salt has a relatively high energy storage density and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 杨波杨肖王启扬杨冬梅杜炜
Owner NARI TECH CO LTD