What is precision air conditioning?
Precision air conditioning (also known as constant temperature and humidity air conditioner), mbth PrecisionAirConditioner, refers to a special precision air conditioning for computer room, which can fully meet the environmental requirements of computer room. It is a new model gradually developed in recent 30 years, characterized by large air volume and large heat load change, and is used in libraries, archives and banknote printing plants.
What are the characteristics of precision air conditioning?
1. In the design of precision air conditioning, the evaporation pressure in the evaporator is strictly controlled, and the air supply volume is increased, so that the surface temperature of the evaporator is higher than the air dew point temperature, and dehumidification is unnecessary. All the generated cold energy is used to reduce the temperature, which improves the working efficiency and reduces the water loss (the air supply volume is large and the air supply enthalpy difference is reduced).
2. precision air conditioning has a large air supply volume and high air exchange rate in the machine room (generally 30 ~ 60 times/hour), which can form an overall air circulation in the whole machine room, so that all equipment in the machine room can be evenly cooled.
3. precision air conditioning has a large air volume and good air circulation. At the same time, due to the special air filter, the dust in the air can be filtered out in time and efficiently, and the computer room can be kept clean and tidy.
4. The general comfort air conditioner is difficult to work normally because of the low outdoor condensation pressure. Precision air conditioning can ensure the normal operation of refrigeration cycle through controllable outdoor condenser.
5. precision air conditioning is generally equipped with special humidification system, efficient dehumidification system and electric heating compensation system. Through the microprocessor, the temperature and humidity in the computer room can be accurately controlled according to the data fed back by various sensors.
The difference between precision air conditioning and ordinary air conditioners;
1, the traditional comfort air conditioner is mainly designed for personnel, with small air supply volume and large enthalpy difference, and refrigeration and dehumidification are carried out at the same time; The sensible heat in the computer room accounts for more than 90% of the total heat, including the heat generated by the equipment itself, the heat generated by lighting, the heat conducted through walls, ceilings, windows and floors, the radiation heat of sunlight, the heat generated by wind and fresh air penetrating through gaps, etc. The humidity generated by these calorific values is very small, and comfortable air conditioning will inevitably lead to low relative humidity in the machine room, which will accumulate static electricity on the surface of circuit components inside the equipment, produce discharge, damage the equipment and interfere with data transmission and storage. At the same time, because (40% ~ 60%) of the cooling capacity is consumed in dehumidification, the cooling capacity of the actual cooling equipment is greatly reduced, which greatly increases the energy consumption. In the design of precision air conditioning, the evaporation pressure in the evaporator is strictly controlled, and the air supply volume is increased, so that the surface temperature of the evaporator is higher than the air dew point temperature, and dehumidification is not needed. All the generated cold energy is used to reduce the temperature, which improves the working efficiency and reduces the water loss (the air supply volume is large and the air supply enthalpy difference is reduced).
2. Comfortable air conditioners have small air volume and low wind speed, and can only circulate locally in the direction of air supply, and cannot form an overall air circulation in the computer room. Uneven heat dissipation in the machine room leads to regional temperature difference in the machine room, low temperature in the air supply direction and high temperature in other areas, and local heat accumulation of heating equipment due to different placement positions leads to overheating and damage of the equipment. However, in precision air conditioning, only when the air supply volume is large and the air exchange rate of the machine room is high (generally 30 ~ 60 times/hour) can the whole air circulation be formed in the whole machine room, so that all the equipment in the machine room can be cooled on average.
3. However, the traditional comfort air conditioner, because of its small air supply volume and less air exchange times, can't ensure that the air in the machine room has a high enough velocity to bring the dust back to the filter screen, resulting in deposits in the equipment in the machine room, which has a bad influence on the equipment itself. Moreover, the filtration performance of general comfort air conditioning units is poor, which can not meet the purification requirements of computers. Precision air conditioning is used for large air volume and good air circulation. At the same time, it has a special air filter, which can filter out the dust in the air in time and efficiently and keep the computer room clean and tidy.
4. Because most of the electronic equipment in the computer room runs continuously and works for a long time, it is required that precision air conditioning can be designed to run continuously with heavy load all the year round and maintain high reliability. Comfortable air conditioning is difficult to meet the requirements, especially in winter, because the machine room is well sealed and there are many heating devices, the air conditioning unit still needs to work normally. At this time, the general comfort air conditioner has been difficult to work normally because of the low outdoor condensation pressure, but precision air conditioning can still ensure the normal operation of the refrigeration cycle through the controllable outdoor condenser.
5. precision air conditioning is generally equipped with special humidification system, efficient dehumidification system and electric heating compensation system. Through the microprocessor, the temperature and humidity in the machine room can be accurately controlled according to the data fed back by each sensor, while the comfortable air conditioner is generally not equipped with a humidification system, and can only control the temperature, with low accuracy and difficult humidity control, which cannot meet the needs of equipment in the machine room.
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