Why can only precision air conditioners with constant humidity and cleanliness be used in the computer room

Why can only precision air conditioners with constant humidity and cleanliness be used in the computer room

The country divides computer rooms into Type A, Type B and Type C. The requirements for the three types of computer rooms are different, and the requirements for various construction standards and operating indicators are sequentially reduced.

　　 Class A and Class B equipment rooms have the same requirements, the temperature is 23±1℃, and the humidity is 40%~55%.

　　 The temperature of the C type computer room is 18~28℃, and the humidity is 35%~75% When choosing a data center refrigeration system, only precision air conditioners dedicated to the computer room can be used. Some data center IT personnel believe that comfort air conditioners can also be used to cool the computer room, and believe that comfort air conditioners have high energy efficiency, so they can reduce the energy consumption of the cooling system. .

　　In the computer room, the sensible heat load is almost entirely composed of sensible heat generated by IT hardware, lighting, supporting equipment, cabinets and power supply. Because there are almost no people and the outdoor air is limited, there is very little latent heat. In view of this situation, the required sensible heat ratio of air conditioners is very high, ranging from 0.95 to 0.99. Only precision air conditioners in the computer room can achieve this very high sensible heat ratio.

　　Relatively speaking, the sensible heat ratio of comfort air conditioners is usually 0.65~0.70. Therefore, the sensible heat provided is too little and the latent heat and cooling are too much. Excessive latent heat and cooling will continuously remove moisture from the air. In order to maintain the required relative humidity range of 45% to 50%, constant humidification will be required, which must consume a lot of energy.

At the same time, the precision air conditioner has a high-precision, sensitive, microprocessor-based remote 485 control system, which can quickly respond to changes in the external environment, thereby ensuring that the environmental changes remain within the range of the setting values ​​required for a stable environment. Inside. Comfort air conditioners usually include limited basic control systems that cannot react quickly enough to ensure the required temperature difference.

Moreover, precision air conditioners in computer rooms usually use high and medium-efficiency filters to reduce dust in the air to less than z* and ensure cleanliness. Comfort air conditioners use coarse-efficiency filters, which cannot remove enough dust particles; when designing precision air conditioners in computer rooms Designed according to a comprehensive 8760 hours operation, the components have redundant functions, which can reduce the cost of operation and operation and maintenance.

　　 The computer room special air conditioner has the function of constant humidity, which protects the equipment in the computer room from damage due to excessive humidity and low humidity that affects chip storage. Comfort air conditioners do not have this function. The temperature difference of comfort air conditioner is 1℃, while the temperature difference of precision air conditioner in computer room is 0.1℃ or even higher.

　　 The high-efficiency filter in the precision air conditioner of the computer room ensures a dust-free environment in the computer room. The comfort air conditioner only has inefficient filters. Although the initial investment of precision air conditioners in computer rooms is higher than that of comfort air conditioners, its reliability is several levels higher than that of comfort air conditioners for its 7*24 operation all year round.

　　 Therefore, the refrigeration of the computer room area can only use the special precision air conditioner for the computer room, and the comfortable air conditioner is intelligently used for the cooling of the personnel in the data center and office area.