All About Server Rack Cooling Server rack cooling is a system that can assist in managing airflow and keeping the temperature steady at the specifications of the operation. It is a unique system that presents its unique challenges, usually relating to the type of environment that the rack has been mounted in. It is imperative that data center managers choose the correct type of fans and positions them accurately to allow cool air to flow in from the correct places and that the system pushes the hot or warm air exactly where it needs to go.
Airflow is incredibly important in server cooling because by correctly managing the heat in a server, you can easily lower the temperature in a room, reduce your utility bill, and even stop your server from suffering a crash or total failure. Just as a computer that you use in the home or work needs a fan to push hot air out and cool down the system, so a server needs an intake and an exhaust so that it can draw cool air in on the one side and push hot air out on the other. A rack is usually necessary to house several computers, and it is therefore incredibly important to make sure that the airflow is not only managed in each computer or system but also the rack as a whole. It is imperative to plan how the airflow in the server rack will work so that all the equipment in the rack works together to bring cool air in from one single point and push all the hot air that is generated out of the rack. Server rack fans are usually used to ensure that the airflow is optimal in a server rack and that all the hot air is directed into one spot, usually out the back and then up and out towards the ceiling. Fan trays are important components when considering server rack cooling. These trays serve a very specific purpose. They are used to help move heat out of the rack and they are usually placed in very specific spots, ordinarily where hot spots occur. For example, there may be a case of a server rack containing no equipment or components in a particular spot right at the top. This server rack may be completely enclosed and that empty area may then become a hot spot because of the low circulation due to the lack of components or equipment to push air around. This would be a prime spot to place a fan tray. The fan tray will help move the air around and will prevent excess heat from building up. It is also possible to get horizontal rack fans that can push heat out of the server where the hot spots are occurring. However, instead of moving the air either in an upwards or downwards direction, it directs the heat to flow out of the back. If your rack or server is mounted in an area where hot air that flows upwards would mean that it would circulate back into an already-cool area, it would make more sense to get a horizontal rack fan than a fan tray. Finally, a lot of fans whirring to keep servers cool can make a lot of noise and if the server is in a heavily populated or in a heavy traffic area it can present a problem. Hearing loss and problems start to occur from 85 decibels and some fans can run up to 140 decibels. That is a very big problem and that is why it makes sense to invest in an acoustic rack that will help reduce the noise if your fans are in a spot where they will likely present a problem. However, this can be expensive so should only be a last resort in systems where the fans will cause a problem.
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