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Thanks I well aware see a few post up. Looking at a average summer day 95f so a rise if ten degrees in the room is acceptable

Willard3 I respect your opinion but.... I may have stated the problem incorrectly lead you down the wrong path, I apologize. I want to limit the rise to 15 degrees. So, for a typical summer looking at 95F, you need about 210 CFM for every KW, therefore, revised heat loss of 220KW gives me about...

I cannot use anything but ventilation outside air. So what is the solution?

summer day at 100°F. I HAVE TWO FANS AT 20K CFM

OK....... It is an electrical room with 3 1900kw VFDs and several MCCs. I have not done this type of calculations in 25 years rusty and not trusty. the VFDs are ~96.5 eff.=66.5kw x 3 = 199500w + other equipment; roughly total 250kw. 250,000 watts is my heat loss from the equipment = 853,035...

This is from the manufacturer of the vfd plus the other equipment. I have my answer it is about 40000 cfm

200kw is my heat loss

I have a room I need to cool 5-10°F, using outside air only. The volume of the room is 20,000 cuft. The heat load is 200KW. What is the CFM of my fan?