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Method for generating fixed form of hydrous salt phase-change material and adjusting phase-change temperature by adding inorganic porous material

A technology of inorganic porous materials and phase change materials, applied in the field of phase change energy storage, can solve problems such as inability to use directly, increase cost, leakage, etc., and achieve the effects of easy operation, high phase change enthalpy, and simple process

Inactive Publication Date: 2019-05-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic hydrated salts, like organic solid-liquid PCMs, will leak when the solid-liquid phase transition occurs, cannot be used directly, and usually require special containers, which increases the cost

Method used

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  • Method for generating fixed form of hydrous salt phase-change material and adjusting phase-change temperature by adding inorganic porous material
  • Method for generating fixed form of hydrous salt phase-change material and adjusting phase-change temperature by adding inorganic porous material
  • Method for generating fixed form of hydrous salt phase-change material and adjusting phase-change temperature by adding inorganic porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0032] Add 22g, 25g, 28g, 30g, 32g (respectively 22%, 25%, 28%, 30%, 32%) into 5 sealed glass bottles of 500ml under constant temperature and stirring conditions at 75°C Silica (HL-150) was used as a support, degassed under a vacuum condition of 0.005MPa for half an hour to remove water vapor and air components in the system; melted 100g NaOAc 3H 2 O is slowly added to the above-mentioned support material as a phase change material; it is crystallized and solidified at room temperature, and the temperature-adjustable NaOAc·3H 2 O / SiO 2 Shaped hydrated salt composite phase change material. The material has been tested and has a setting effect, and there is no liquid leakage under the condition of 20°C higher than the phase transition temperature of the compound. At the same time, NaOAc·3H 2 O / SiO 2 (HL-150) The melting point of the shape-setting composite phase change material decreased (ΔT), and the decrease range reached 6°C. The specific data is shown in Table 2.

Embodiment 6-10

[0034] Add 22g, 25g, 28g, 30g, 32g (respectively 22%, 25%, 28%, 30%, 32%) into 5 sealed glass bottles of 500ml under constant temperature and stirring conditions at 40°C Silica (HL-300) was used as a support, degassed under a vacuum condition of 0.005MPa for half an hour to remove water vapor and air components in the system; melted 100g CaCl 2 ·6H 2 O is slowly added to the above-mentioned support material as a phase change material; the glass bottle is placed in a biochemical box at 10°C to cool down to crystallize and solidify, and the temperature-adjustable CaCl 2 ·6H 2 O / SiO 2 (HL-300) Shaped hydrated salt composite phase change material. The material has been tested and has a setting effect, and there is no liquid leakage under the condition of 20°C higher than the phase transition temperature of the compound. At the same time, CaCl 2 ·6H 2 O / SiO 2 The melting point of the shaped composite phase change material decreases (ΔT), and the drop reaches 6°C. The specifi...

Embodiment 11

[0036] In a 500ml sealed glass bottle, add 30g of fumed silica (A380) as a support at a constant temperature of 60°C and stirring, and degas under a vacuum of 0.005MPa for half an hour to remove water vapor and air components in the system ; the molten 100gNaS 2 o 3 ·5H 2 O is slowly added to the above-mentioned support material as a phase change material; it is cooled to room temperature to crystallize and solidify, and the temperature-adjustable NaS 2 o 3 ·5H 2 O / SiO 2 (A380) Shaped hydrated salt composite phase change material.

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Abstract

The invention relates to a method for generating the fixed form of a hydrous salt phase-change material and adjusting the phase-change temperature by adding an inorganic porous material. The method includes the following steps that in an airtight device, under conditions of the constant temperature being 10-30 DEG C higher than the hydrous salt phase-change temperature and stirring, the inorganicporous material is added to be used as a supporting body, and vacuum degassing is conducted to remove water vapor and air components of a system; molten hydrated salt is slowly added into the supporting material as the phase-change material; and the mixture is cooled to be crystallized and solidified, and the forming hydrous salt composite phase-change material with the temperature capable of being adjusted can be obtained. The hydrous salt phase-change material has the characteristics of adjustable temperature, fixed form, high phase-change enthalpy value, stable circulation and the like, andcan be used in building interior wall insulation, floor heating and other aspects.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, and specifically relates to a method for adjusting the phase change temperature of the hydrated salt while setting the shape of the hydrated salt phase change material by using a hydrophilic inorganic porous material as a support carrier. Background technique [0002] With the continuous growth of people's demand for energy, improving energy utilization efficiency and developing new heat storage technologies are emerging. The use of phase change materials (PCMs) for phase change heat storage has been widely favored by people because of its constant temperature during the phase change process and high heat storage density. Phase change materials can be divided into inorganic PCMs and organic PCMs according to their composition. Among them, inorganic PCMs, especially hydrated salt PCMs, are currently the most promising building energy-saving materials in the construction field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 方玉堂汤瑜凤梁向晖汪双凤高学农张正国
Owner SOUTH CHINA UNIV OF TECH