Principle analysis and characteristics of new technology machines for central air conditioning

Principle analysis and characteristics of new technology machines for central air conditioning

1. Water magnetization treatment technology

　　Using the magnetic field effect to treat water is called magnetization treatment of water. This method is to pass the circulating cooling water through a magnetic field, and the water cuts the magnetic lines of force several times to become "magnetized water". The crystals produced in the "magnetized water" do not form scale, but are amorphous powder, so they will not stick to the pipe wall or The surface of other objects should be controlled by water replenishment and regular pollutant discharge during operation.

　　1.1 Discussion on the mechanism of magnetization treatment

　　 (1) Corrosion inhibition mechanism of magnetization treatment

When the water flows through the magnetic field water treatment device, it is affected by the Lorentz force, the positive and negative ions in the water move in opposite directions. In the magnetic field, a potential difference is generated between the positive and negative poles to form a tiny electron flow, which can remove the original rust on the pipe wall ( Fe2O3) is oxidized to produce magnetic iron oxide (Fe3O4). The magnetic iron oxide can be in a stable state and form a protective film to completely isolate the iron pipe wall from water, thereby playing a role in corrosion inhibition.

　　 (2) Anti-scaling mechanism of magnetization treatment

The use of magnetization treatment technology for industrial circulating cooling water for anti-scaling treatment. The mechanism of action is that the magnetic field acts on water and ions in the water, changing the crystallization speed, grain size, and crystal structure of the scaled crystals. The effect of the magnetic field on the water system is very complicated. Sometimes the various effects strengthen each other, and sometimes they cancel each other. The final state is the result of the combined effects of various mechanisms.

　　 (3) Sterilization mechanism of magnetization treatment

　　The influence of magnetic field on biology is a very complicated issue. Current research work mainly focuses on the biological effect of magnetic field, the chemical reaction of magnetic field and the influence of alternating magnetic field on human body. Bacteria can be seen as a magnetic dipole with a length of 0.5 to 1 m and a length of 1 to 8 m in a magnetic field. When it flows through the gradient magnetic field with water, it is subjected to magnetic force and induced current. When the induced current reaches a certain threshold value of 8～(10-3A/m2), it will destroy the cell, or change the way ions pass through the cell membrane, denature protein or destroy enzyme activity. However, the mechanism of magnetic field sterilization, the relationship between the biological effects of bacteria and the magnetic field, and the response of various bacteria to the magnetic field still need a lot of work.

　　1.2 Magnetization treatment effect

　　Experimental results prove that magnetization treatment can effectively reduce the corrosion rate of the system, the rate of fouling deposition and the thermal resistance of fouling, and has a certain sterilization effect. However, in actual applications, due to different water quality conditions, some systems have problems such as high adhesion rates, which should be paid attention to in specific design and use.

　　 2. Electrostatic water treatment technology

　　The electrostatic water treatment method is also called the high-voltage electrostatic method. Its core part is an electrostatic water processor (also known as electrostatic scale controller, electrostatic water generating device). In recent years, another kind of electrostatic water processor-Ion Stick (Ion-Stick) electrostatic water processor has appeared at home and abroad. The ion bar is also a new type of water processor that uses high-voltage static electricity. It has been used in central air-conditioning circulating cooling water, refrigerant water and other systems.

　　2.1 Electrostatic water processor

　　 The principle of scale inhibition of electrostatic water treatment technology is currently believed that under the action of a strong electric field, the dipole moment of water molecules increases, and its hydration capacity with the positive and negative ions of salts also increases. As a result, the solubility of scale is increased, and the rate of dissolution of scale is accelerated, which has the effect of scale inhibition and scale dissolution.

　　2.2 ion bar

　　 In recent years, another kind of electrostatic water processor-ion stick (Ion-Stick) electrostatic water processor (ion stick) has appeared in China. The ion bar is also a new type of water processor that uses high-voltage static electricity. It is used in central air conditioning circulating cooling water, refrigerant water, heat exchange and boiler feed water systems.

　　 ion bar (large systems can be used in series with multiple) has obvious effect of scale inhibition, easy installation, small size, simple maintenance, and service life of more than 10 years. The characteristics of electrostatic water treatment technology are: not only can prevent scale and scale, but also sterilize and kill algae, small size, durable equipment, no pollution to the environment, and convenient management. There have been many examples of successful application in China, and it is believed that it will be gradually adopted in the actual central air conditioning circulating water system treatment project.

　　2.3 Electronic Scale Inhibitor

The electronic scale arrester uses the high-frequency electromagnetic oscillation generated by the electronic circuit to form a certain strength high-frequency electromagnetic field between two fixed stages. After the circulating cooling water absorbs the high-frequency electromagnetic field energy, the water molecules are continuously repeated as dipoles. Polarization produces distortion, deformation, reversal, and vibration to form highly active single molecules or small association groups of water, thereby enhancing the dipole moment between water molecules and promoting water to scale substances and their components The function of the cyclic cooling water changes the existence form of the deposited substances in the circulating cooling water and the properties of related ions and the combination state of water molecules and other ions, which prolongs the precipitation time of CaCO3 crystals and other deposits, and uses fine amorphous particles. Precipitation, and finally achieve the purpose of preventing the generation of scale and loosening and peeling off the already generated scale.