Heat load of a Computer Room

[Hileg]

How can I calculate the heat load of a computer room. the power consumtion is 210,000 watts of variuos types of servers and mainframe. The room is 80' by 65' by 8'. the room temp is maintained @ 70 degrees. How would I calculate the tempature rise of this room if all the lieberts units were turned off. I need to know how quickly the temp. would come up in say 10 minutes. Please help. thanks

 

[IRstuff]

What's the total CFM capacity of the boxes?

TTFN

 

[Hileg]

There are 6 15-20 ton Lieberts (Fan and Coil)sitting on a raised floor. No boxes. If the Lieberts were off, the cfm would be 0. Thanks

 

[IRstuff]

I was referring to the computers, not the A/C

TTFN

 

[IRstuff]

I guess it really doesn't matter.

In any case, you'll have not more than about 5 minutes to shutdown the computers or turn on a backup system.

The air rise rate is almost irrelevant, since the thermal time constant of the chips that need cooling is on the order of seconds. Every degree rise in air temperature is a reduction in heat transfer efficiency between those chips and the ambient. By the time you realize there is a critical air temperature, the processors will have been cooking for a while.

What that means is that you should have the Lieberts on separate breakers (probably true anyway) and have the processors monitor whether the all Lieberts have shut off and initiate auto shutdowns immediately under such a condition.

Hopefully, that condition should never occur.

TTFN

 

[Hileg]

Thank You for your help