Precision air conditioners in the computer room can also be called constant temperature and humidity air conditioners. They control the ambient temperature with high precision, and can ensure the cleanliness of the computer room. Efficiency, so what cooling methods do precision air conditioners have? From a professional perspective, it can be divided into four types:
Air-cooled precision air conditioner
Self-contained refrigeration system, independent operation air-conditioning system;
The system is simple in structure, easy to install, and less difficult to construct. The pipeline takes up less space in the machine room and is easy to expand. Only the machine room provides installation space;
The unit has the greatest independence, and there is no fault correlation;
The refrigerant pipeline should not be too long, and the outdoor condenser should not be less than 5 meters from the indoor unit;
It is mostly used in small and medium-sized computer rooms (under 1000KW, 1000㎡) or without professional maintenance personnel.
2. Water-cooled precision air conditioner
With its own refrigeration system, a centralized radiator (water tower or dry cooler) is generally used for heat dissipation, with natural water temperature;
Solve the problem of excessively long pipes of the self-contained refrigeration system or negative height difference between indoor and outdoor;
When the cooling water flow adjustment device is adopted, the refrigeration system runs more stably and is more efficient than the air-cooled system;
The system design is complicated, and the shared water supply pipeline may lead to system risks. When the load and equipment are put into phases, the system reservation design needs to be done in advance, otherwise it will be difficult to expand later, and attention should be paid to water quality issues;
It is mostly used when it is difficult to implement air-cooled models in the computer room.
3. Chilled water precision air conditioner
It does not have its own refrigeration system, and the air conditioning system is provided by the external central air conditioner to fix the water temperature;
The unit structure is simple, there are few failures, the maintenance workload is small, and the stand-alone cost is low;
A variety of energy-saving operation modes are realized through EC fans: such as high water temperature and high return air temperature energy-saving operation mode, intelligent backup management energy-saving operation mode, raised floor static pressure management energy-saving operation mode, etc.;
The system design is complicated, and the shared water supply pipeline may cause system risks. When the load and equipment are put into phases, the system reservation design needs to be done in advance, otherwise it will be difficult to expand the capacity later;
It is mostly used in the case of large computer rooms.
4. Double cold source type
Two-way cold source, the main system generally uses chilled water, and the standby system is determined according to the situation (air-cooled or water-cooled);
Use chilled water to improve the energy efficiency ratio of the system;
The backup system increases reliability;
The system design is complicated, and the shared water supply pipeline may lead to system risks. When the load and equipment are put into phases, the system reservation design needs to be done in advance, otherwise it will be difficult to expand later, and attention should be paid to water quality issues;
It is mostly used when the frozen water source is unstable.
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