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All good input. The big thing I was questioning is the exception: "The total supply capacity of all fan cooling units not provided with economizers shall not exceed 20 percent of the total supply capacity of all fan cooling units in the building or 300,000 Btu/h (88 kW), whichever is greater."...

Hi all, I wanted to get some other opinions on the interpretation of the energy code economizer requirements. I am in Climate Zone 5, Chicagoland, for what its worth. IECC 403.5 requires economizers on systems over 54,000 btu/h cooling capacity. The second part of that requirement says "The...

This helped me look at it differently. My thoughts about the number of air changes is like saying, "8000 CFM across this little radiator?? That's so much airflow across a tiny surface, the temperature rise will be negligible" Wrong. There is still a rate of heat exchange associated with a volume...

I wouldn't say this was overlooked. I think it is irrelevant to the question. We are assuming a scenario with 100% load. Energy consumption is a separate conversation. You can also save energy by running the single room-exhaust fan on a VFD based on a temperature sensor, and only exhaust as much...

Thank you for your responses. @nuuvox000 - I've been told that the compressors have no control output to control an external fan, so how do you suggest interlocking? Just a relay that turns the fan on if the compressor is pulling power? I understand the heat gain is huge and I know the...

I think its actually closer to 25,000 CFM for 20F rise, but the question is more about whether that concept even holds true when the air is changing every 30 seconds. I'd think at a certain exchange rate, its pointless to calculate a temperature rise because it will just equal the intake air...

I have a 600 sq.ft. room, x 15 ft high that houses three 75HP air compressors. In lieu of ducting each compressor individually, I'd like to provide a single exhaust fan on the roof, and interlock it with a louver on the exterior wall. Each compressor's internal air-cooled fan does 8,000 CFM...