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Phase change material

A technology of phase change materials, sodium acetate trihydrate, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of poor performance stability, low latent heat of phase change, strong corrosion, etc., and achieve low cost and phase change The effect of reversible process and simple preparation method

Inactive Publication Date: 2003-12-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are few types of phase change materials with a phase change temperature of about 30°C, and most of them have high cost, low latent heat of phase change, poor performance stability, and strong corrosion, which makes them widely used in construction and life. there are certain difficulties

Method used

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Examples

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Effect test

Embodiment 1

[0014] (1) prepare materials, select industrial grade sodium acetate trihydrate [CH 3 COONa·3H 2 O] and urea [CO(NH 2 ) 2 ] were ground separately; using anhydrous sodium acetate [CH 3 COONa] mixed with water in a mass ratio of 41:27 to form sodium acetate trihydrate;

[0015] (2) Press CH 3 COONa·3H 2 O and CO(NH 2 ) 2 The mass ratios are 65% and 35% respectively, mixed and stirred evenly, and put into a glass or ceramic container;

[0016] (3) Heat the container in a water bath at about 70°C, and keep stirring while heating, the mixture will gradually melt and gradually turn into a transparent liquid;

[0017] The phase change temperature of the prepared phase change material is 29-32°C, and the latent heat of phase change is 230kJ / kg, see attached figure 1 .

Embodiment 2

[0019] (1) prepare materials, select industrial grade sodium acetate trihydrate [CH 3 COONa·3H 2 O] and urea [CO(NH 2 ) 2 ] were ground separately; using anhydrous sodium acetate [CH 3 COONa] mixed with water in a mass ratio of 41:27 to form sodium acetate trihydrate;

[0020] (2) Press CH 3 COONa·3H 2 O and CO(NH 2 ) 2 The mass ratio is 50% and 50% respectively, mixed and stirred evenly, and put into a glass or ceramic container;

[0021] (3) Heat the container in a water bath at about 75°C, and keep stirring while heating, the mixture will gradually melt and turn into a transparent liquid.

[0022] The phase change temperature of the prepared phase change material is 29-33°C, and the latent heat of phase change is 170kJ / kg, see attached figure 1 .

Embodiment 3

[0024] (1) prepare materials, select industrial grade sodium acetate trihydrate [CH 3 COONa·3H 2 O] and urea [CO(NH 2 ) 2 ] were ground separately; using anhydrous sodium acetate [CH 3 COONa] mixed with water in a mass ratio of 41:27 to form sodium acetate trihydrate;

[0025] (2) Press CH 3 COONa·3H 2 O and CO(NH 2 ) 2 The mass ratios are 70% and 30% respectively, mixed and stirred evenly, and put into glass or ceramic containers;

[0026] (3) Heat the container in a water bath at about 65°C, and keep stirring while heating, the mixture will gradually melt and turn into a transparent liquid;

[0027] The phase change temperature of the prepared phase change material is 26-33°C, and the latent heat of phase change is 120kJ / kg, see attached figure 1 .

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Abstract

The present invention relates to a phase transition material, it contains trihydrated sodium acetate whose mass ratio is 50-70% and urea with mass ratio of 30-50%. The above-mentioned two materials are uniformly mixed, heated in constant temperature water bath 65-80 deg.c and continuously stirred until the mixture is changed into the transparent liquor. Said phase transition material is nno-toxic and has no corrosion, and its phase transition process is reversible, and can be used for several times, and its phase transition temp. is 26-33 deg.c and its phase transition latent heat is greater than 100 kJ / kg.

Description

technical field [0001] The invention relates to a phase change material and a preparation method thereof, in particular to a phase change material with a phase change temperature of about 30°C. Background technique [0002] Using the latent heat of phase change materials to store or release thermal energy can create various facilities that improve energy efficiency; at the same time, using the characteristics of phase change materials that the temperature is approximately constant during phase change can achieve the purpose of temperature control. This kind of material is widely used in civil and military fields such as solar energy utilization, waste heat recovery, intelligent automatic air-conditioning buildings, glass greenhouses, phase change energy storage air conditioners, electrical constant temperature, thermal insulation clothing, energy storage cookers, etc., and the scope of application is constantly increasing. expand. [0003] Among these phase change materials...

Claims

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Application Information

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IPC IPC(8): C09K5/02
Inventor 张寅平王馨林坤平徐煦
Owner TSINGHUA UNIV
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