Required Air Flow for Cooling

[arocha06]

I have a generator in a 20 m^3 room putting out 86 kW and am trying to figure out the rate at which I need to supply/exhaust air in order to maintain a reasonable room temperature (temperature rise < 5 C).

I used the formula q=m(Cp)(dT)
using
q=86kW
m=mass of air= 25 lbs
Cp=air heat coefficient=1 kJ/kg*K

and got a temperature increase of 3.6 degrees C per second. This value seems far too high but I can not find where I went wrong. Any help/insight would be greatly appreciated.

 

[MintJulep]

Mixed units.

Power is energy per time.

Mass is not a time function.

 

[willard3]

Hire an Engineer familiar with ventilation and read forum policies which begin as follows:

>>>>>>>>These fora should not be used to bypass your own in-depth research on the issues that affect you, nor is it intended to be a substitute for appropriate professional assistance within your field or geographical region.>>>>>>>>>>>

 

[EdStainless]

Is your generator actually giving off 86kW, or is it supplying 86kW of electrical power?
You will need to know the actual environmental heat rejection.
Industrial HVAC guys are good at this work.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[urgross]

I would recommend going to the generator IOM manual and seeing what the manufacturer gives for radiator air flow.

 

[jkauwale]

All of the major generator manufacturer's have design guides that discuss the required airflow for generator rooms. This is the best place to start:

Caterpillar:

http://www.cat.com/cda/files/3375314/7/Engine

Cummins:

http://cumminspower.com/

http://www/literature/applicationmanuals/t030-ch-6-en.pdf

Baldor:

http://www.baldor.com/downloads/manuals/_downloads/2400-405.pdf

Justin K, P.E.

http://www.engproguides.com