Originally Posted by
Maxt
All portable and condensed versions of a/c are low on airflow. The golden rule for air conditioning is 400 cfm/ton, you'll find those portables only put out 225-275 cfm. Also, they sit on the floor so the air distribution is poor. The heat leakage from the ceiling space venting isn't helping anything.
What size is the UPS on the rack? that or doing an amp draw on the room panel is the best way to size a server room, or you can call every manufacturer of everything in the rack and ask for heat rejection rating, and add in a little for lights and people.
I would guess you are getting about 8000 real btu/hr out of those machines, so you have 16,000 with really bad air distribution... A real machine to handle that load runs about 11-12k installed...