The high-precision constant temperature and humidity air conditioner for computer rooms has the following characteristics: large air volume, small enthalpy difference, high sensible heat ratio; the heat load of the computer room varies greatly, usually between 10% and 20%; there are various ways of sending and returning air, including upper air supply, lower air supply, upper return air, lower return air, side return air, etc., and the commonly used ones are upper delivery and lower return and lower delivery and upper return; the reliability is high, and the control system and functions of the high-precision constant temperature and humidity air conditioner for computer rooms are much more complete than those of general comfort air conditioners; the reliability of operation throughout the year and all-weather operation.
    Based on the characteristics of the high-precision constant temperature and humidity air conditioner for computer rooms, when the purchaser proposes the purchase demand of high-precision constant temperature and humidity air conditioners, it is necessary to pay attention to the differences from the general air conditioner purchase demand. The following factors should be considered when selecting a machine and filling in the purchase requirements:
1. When selecting a model, the environmental heat source should be considered
    . According to the heat generation of the equipment in the machine room, the area of ​​the machine room, the conditions of the machine room (including floor height, sealing, decoration, outdoor unit installation location, etc.), local climatic conditions, etc., the total cooling capacity, total air volume, humidification capacity and other parameters of the machine room air conditioner are estimated, and then the appropriate equipment capacity is selected (certain equipment backup can be considered).
2. When selecting a model, the air conditioning cooling method should be considered
    . According to the overall structure of the entire building, a suitable air conditioning cooling method (air-cooled, water-cooled, dual cold sources, etc.) should be selected.
3. When selecting a model, the air supply method should be considered
    . Combined with the structural characteristics of the machine room itself and user requirements, the air supply method should be reasonably selected. The air supply form of the high-precision constant temperature and humidity air conditioner dedicated to the machine room is mostly top-down and bottom-down. When selecting the bottom air supply equipment, the static pressure box under the electrostatic floor is used as the air conditioner. In order to ensure smooth air supply, the height of the electrostatic floor must be guaranteed to be 300. When selecting upper air supply equipment, you can choose the hood air supply method. Generally speaking, the quiet height of this machine room is above 2.8 meters, and the area of ​​the machine room cannot be too large, otherwise uneven air supply will occur.
4. Energy saving and future operating costs should be considered when selecting
    From the perspective of energy saving, it is advisable to use a dual cold source air conditioner, which is an energy-saving air conditioner. The energy-saving power resources are more than 40% more than the simple electric refrigeration air conditioner of the same capacity.
5. High-precision constant temperature and humidity air conditioners with purification systems need to consider the requirements
    for external residual pressure of the machine High-precision constant temperature and humidity air conditioners but systems without purification requirements do not require high external residual pressure of the air conditioner, mainly overcoming the return air ducts, valves, diffusers, primary filters, etc. However, systems that have both constant temperature and humidity requirements and purification level control require higher external residual pressure of the air conditioning unit. Generally, the total system resistance is between 1100Pa-1400Pa, mainly overcoming the resistance of the return air ducts, valves, diffusers, primary filters, medium efficiency filters, high efficiency filters, etc. The requirements for external residual pressure need to be considered when selecting.