Phase Change Microencapsulation A New Environment friendly Heat Storage and Exothermic Material

Product Overview

Description

On Phase Change Materials

Definition of Phase Change Materials

Phase change materials (PCMs) are substances that change their shape with temperature and provide latent heat. The process of phase change material from solid to liquid or from liquid to solid is called phase change process. At this time, phase change material will absorb or release a lot of latent heat.

Characteristics of Phase Change Materials

1. High heat storage, high efficiency, ensure hot water supply in the system
2. Remove the traditional solar water heater water tank and save space.
3. Make the installation of water heater no longer subject to floor restrictions, installation and use more convenient.
4. Make the hot water supply of the system no longer affected by the weather
5. The whole system has no power design, less heat loss, more energy-saving and environmental protection.

 

 

* Taking solid-liquid phase change as an example, when the solid phase change material is heated to the melting point, the phase change from solid to liquid occurs. In the process of melting, the phase change material is formed.
The material absorbs and stores a large amount of latent heat and keeps its own temperature constant.

 

On Phase Change Microencapsulation

 

Microcapsule

Microencapsulation can be defined as a process in which one substance surrounds or encapsulates another substance in a very small range, ranging in size from 1 micron to several hundred microns. Microencapsulation may be spherical, encapsulating the outer wall around the center, while some are asymmetrical and of different shapes, with a small number of droplets embedded in the core material of the whole microcapsule.

Microencapsulation of Phase Change Materials

Microencapsulated phase change materials can be applied almost limitlessly, and more and more applications need to use microencapsulated phase change materials. Phase change materials (PCMs) absorb or release a lot of energy by changing their morphology through the change of ambient temperature. When the temperature rises, the phase change materials begin to melt and absorb heat; on the contrary, when the temperature decreases, the phase change materials release heat.
This property of microcapsule encapsulated phase change materials can be used in military equipment, bedding, clothing, building materials, and many other products.

 

 

 

Applications of phase change materials in other fields:

1. Energy-saving building field - phase change energy storage building materials
Phase change energy storage building materials have the advantages of both common building materials and phase change materials, which can absorb and release appropriate heat energy; can be used in conjunction with other traditional building materials; do not need special knowledge and skills to install and use thermal storage building materials; can be produced with standard production equipment; and have competitiveness in economic benefits.

2. Medical and biological fields
Temperature-sensitive biomedical products can be refrigerated and transported isothermally. Phase change materials can provide a stable low temperature environment for a long time without power supply. They are especially suitable for the transportation process of temperature-sensitive biomedical products. In addition, thermostatic control in biomedical engineering is also included.

3. Fuel cell temperature control
Fuel cell start-up needs a certain temperature, so it is very important to maintain a certain temperature for the fuel cell to start again in the cold winter. Phase change materials (PCMs) can be used to store the heat emitted by fuel cells during their use. Because the heat storage density of phase change material is very high, and its heat storage temperature is appropriate, the heat loss is very small, and the heat can be maintained for a considerable period of time.

4. Heat Dissipation of Electronic Equipment
Phase change materials (PCMs) can be used for temperature control in electronic products by their endothermic properties. The most significant function of PCMs is to suppress the temperature fluctuation of high power electronic devices and protect electronic devices. Phase change materials (PCMs) can be introduced at the level of electronic chips and devices. They have the advantages of quiet, noise-free, power-free, high long-term stability, small size and high thermal comfort.

5. Textile field - thermostatic fabrics
Summer cooling (winter warming) clothing: nanophase change energy storage composite powder (microcapsule phase change material) is added to textile fibers to produce textile fibers with energy storage function, which can be used to make high-grade clothing. In winter, indoor phase change materials can absorb heat from indoor environment and human body by melting. When going out, phase change materials will release heat slowly to clothing through solidification, which can provide warmth retention function. In summer, phase change materials can also cool the human body. It can make corresponding endothermic or exothermic reaction to the surface of human skin according to the change of external temperature, so that the fluctuation of body surface temperature is relatively reduced, and then improve comfort/enhance the role of resisting adverse environment.

6. Temperature Control in Military Infrared Camouflage and Armored Vehicles
Infrared camouflage: Outside military buildings, phase change materials of various forms, such as coatings, mortar, sheets, fabrics, are used for decoration. These phase change materials can absorb the heat generated by personnel and equipment in buildings, keep the temperature of buildings unchanged, so as to avoid buildings being detected by the other side's infrared sensors.
Temperature Control in Armored Vehicle: The interior thermal environment of the armored vehicle is very poor, and the heat is difficult to be discharged in time. Phase change materials can absorb these heat, stabilize the interior temperature and maintain a more comfortable temperature environment.

7. Rescue Area - Mine Refuge Chamber and Rescue Chamber
Phase change materials are packed in the designed lifesaving cabin and equipped with certain food nutrition supplies, which are placed in the fixed place of underground coal mine operation. When an accident occurs, the operator quickly enters the phase change lifesaving cabin. The phase change material can provide a comfortable environment, and the food provided prolongs the survival probability of the escapees. At the same time, the fixed position of the rescue cabin also saves rescue time and is more conducive to rescue.

8. Agriculture
Water-containing phase change material capsules are embedded in soil with seeds to ensure that seeds can germinate and grow in desert and other harsh environments. At the same time, it can also be used in greenhouse greenhouse and phase change material for heat absorption and exothermic function, which can keep the temperature in the greenhouse relatively constant during the day and night, and better promote the growth of crops.