1. Principle of vacuum hot water unit: The compressor compresses the low-pressure refrigerant flowing back and turns it into high-temperature and high-pressure gas to be discharged, and the high-temperature and high-pressure refrigerant gas flows through the copper tube wound outside the water tank. Heat is transferred to the water tank through copper pipes. The cooled refrigerant becomes liquid under the continuous action of pressure and enters the evaporator through the expansion valve.
When the pressure of the evaporator suddenly drops, the pressure of the evaporator means that the liquid refrigerant quickly evaporates into a gas state and absorbs a lot of heat. At the same time, under the action of the fan, a large amount of air flows through the outer surface of the evaporator, the energy in the air is absorbed by the evaporator, the air temperature drops rapidly, and then it becomes cold air and is discharged into the kitchen. Subsequently, the refrigerant that has absorbed certain energy flows back to the compressor and enters the next cycle.
2. Principle of vacuum hot water boiler: The vacuum boiler forms a negative pressure vacuum environment in a closed furnace body, and the furnace body is filled with heat medium water. Heat medium water is heated by combustion or other means to generate steam. Steam is heated by condensing heat exchange tubes to supply hot water.
Second, the characteristics are different.
1, vacuum hot water unit features:
(1) security
Because it is not directly heated by electric heating elements, compared with electric water heaters, it eliminates the potential safety hazard of electric leakage; Compared with gas water heaters, there are no potential safety hazards such as gas leakage and carbon monoxide poisoning, and the safety performance is more excellent.
(2) Comfort
The integral air energy water heater is renewable. According to the temperature in the water tank, the heating function is automatically started to ensure that the hot water supply is sufficient for 24 hours. Therefore, there will be no problem that the gas water heater cannot meet the needs of multiple faucets at the same time, and there will be no problem that the capacity of the electric water heater is small and many people need to wait for a bath. Instant heat, large amount of water and stable water temperature.
2, vacuum hot water boiler features:
(1) Safe and reliable pressure operation.
During the operation of vacuum boiler vacuum hot water boiler, the internal pressure of the furnace body is always in the vacuum state of-15 cmhg-76 cmhg. Even if the U-shaped heat exchanger cannot exceed the external atmospheric pressure due to external pressure leakage or operation failure, the controller, water temperature control, overheating switch and vacuum pressure switch will automatically cut off the power supply.
(2) Long service life
Because the inside of the vacuum boiler is a closed whole, oxygen in the medium water is separated and discharged from the furnace during operation. Oxygen corrosion will not occur in the furnace for a long time. Add a small amount of heat medium water at a time, and add a small amount of calcium and magnesium ions at the same time.
Therefore, there is no scaling inside the boiler, and the service life of the boiler is prolonged. The service life of the boiler is 1.5 ~ 2 times. The heat exchanger is made of stainless steel tube, which is corrosion-resistant and has a design service life of more than 15 years.
Extended data:
Vacuum hot water boiler was born in 1972 Zurich University of Technology. 1975, TAKUMA Company of Japan developed a vacuum hot water boiler based on this principle and obtained an invention patent. Later, it gradually spread to all parts of the world. This technology was developed by a Korean company, and TAKUMA in Korea appeared one after another.
In the late 1980s, some domestic manufacturers developed vacuum hot water boilers. However, due to technical problems, it is impossible to solve the problem that the electrochemical reaction between water and iron leads to the continuous decline of boiler vacuum degree under sealed vacuum conditions. In 1990s, Korean manufacturers entered the China market relatively. Later, around 2003, domestic boilers began to produce vacuum boilers.
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