Server cabinet cooling tips?

Question

Do it yourself

Need advice from server gurus.
There is a server room in the warehouse, where it is always cold (up to 15 in summer, minus 3 in winter). Air conditioning is not allowed (someone else's building, the owner is against it), so I decided to make ventilation using a false ceiling: under the door into the server room 100x20cm with filters and supply fans, then the air goes through channels into the floor grilles in front of the server cabinet with a perforated door (cabinet up to 32U , three servers below, passive above). It seems to be good (but I'm waiting for criticism). The question arose of how to draw hot air out. From above with a fan module and into the channel to the street? Or behind? Cabinet 3 kW. The picture shows a rack with bars in front of it and a rack. The room is heated up to +5 from the warehouse temperature due to neighboring rooms.

Answer 1

Don't forget about air humidity. You can "catch" the condensate.
Air conditioners are not in vain installed - in addition to cooling, they also dry the air.
Put at least a bag with silica gel)
Yes, and it is very important that after the equipment is stopped, for example, repair, maintenance, how will the disks start at -3? In general, all these temperature drops are not ice for iron. After a while, you will begin to notice on system performance.
Maybe think about a mobile air conditioner with a heating function and the server room will have a constant temperature and humidity.

Answer 2

The "shelf" mode, even with passive (at such ambient temperature), will be enough:
Let a rack of 32U and 3 1U servers and a shelf with 1U passive.
Passive - place on a perforated shelf below the lowest server in the middle of the bay, i.e. somewhere at a height of 5U.
Servers - place on 10U, 20U, 30U places.
From 1 to 10 - put a regular filter grill on one side of the cabinet to allow cold air to enter the exhaust "tower" as quickly as possible.
After that, the servers and the difference in temperature pressure will themselves pump warm air upwards with constant acceleration, and the air space between the servers will allow additional air to cool from the cabinet walls.
Top: just use a regular grid.
To make it even better: from below and from above - powerful fans for the entire area of ​​​​the rack base. If it is possible to bring the channel to the street - ONLY from above!

Answer 3

Cabinet 3kW

The case really consumes 3 kW??? Measured? 3 servers by no means can take more than 1 kW.
What temperature and what "overheating" relative to the warehouse temperature is set in the server room in a day or two with the supply turned off?
It seems to me that under such conditions it is enough to remove or open or replace the front and back doors with mesh, the servers will be cooled normally, and the temperature in the server room will not rise above 25 degrees in summer without any additional measures such as air supply.