The special precision constant temperature and humidity air conditioner for the computer room has the following characteristics: large air volume, small enthalpy difference, high sensible heat ratio; the thermal load of the computer room varies greatly, usually between 10%-20%; and the ways of sending back air are various. There are upper air supply, lower air supply, upper return air, lower return air, side return air, etc., commonly used are upper delivery, lower return and lower delivery and upper return; high reliability, dedicated precision constant temperature and humidity air conditioning in the computer room The control system and functions are much more complete than the general comfort air conditioner; it is reliable throughout the year and runs around the clock.
Based on the characteristics of the precision constant temperature and humidity air conditioner in the computer room, the purchaser needs to pay attention to the difference from the general air conditioner purchase requirement when proposing the purchase requirement of the precision constant temperature and humidity air conditioner. The following factors are mainly considered when selecting the machine and filling in the procurement requirements:
1. Consider the environmental heat source when selecting
Estimate the total cooling capacity, total air volume, humidification capacity and other parameters of the computer room air conditioner based on the heat generation of the equipment in the computer room, the area of the computer room, the conditions of the computer room (including floor height, sealing, decoration, outdoor unit installation location, etc.), local climate conditions, etc. , And then select the appropriate device capacity (you can consider a certain device backup).
2. Consider the air conditioning cooling method when selecting
Choose appropriate air-conditioning cooling methods (air-cooled, water-cooled, dual cold sources, etc.) according to the overall structure of the entire building.
3. Consider the air supply method when selecting
Combining the structural characteristics of the computer room and user requirements, the air supply method is reasonably selected. The air supply mode of the precision air conditioner for the computer room is mostly the top-to-bottom type and the bottom-to-bottom type. When selecting the lower air supply equipment, the static pressure box under the electrostatic floor is used as the air conditioner. In order to ensure the smooth air supply, the height of the electrostatic floor must be 300. If you choose the upper air supply equipment, you can use the hood air supply method. Generally speaking, the static air height of this kind of machine room is above 2.8 meters, and the area of the machine room cannot be too large, otherwise the air supply will be uneven.
4. Consider energy saving and future operating costs when selecting models
From the perspective of energy saving, it is advisable to use dual cold source air conditioners. This is an energy-saving air conditioner. The energy-saving power resource is more than 40% more energy-saving than a simple electric refrigeration air conditioner with the same capacity.
5. Precision air conditioners with purification systems need to consider the requirements of external residual pressure
Precision air-conditioning systems without purification requirements do not have high requirements for the residual pressure outside the air conditioner, and mainly overcome the return air ducts, valves, diffusers, and primary filters. However, systems that require both constant temperature and humidity requirements and purification level control have higher requirements for the external residual pressure of the air conditioning unit. Generally, the total resistance of the system is between 1100Pa and 1400Pa, which mainly overcomes the return air duct, valve, and diffuser. , The resistance of primary filter, medium-efficiency filter, high-efficiency filter, etc. needs to be considered when selecting the model.
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