12x12 building Enthalpy based economizer

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Hi folks,

I'm a broadcast engineer looking to design an approximation of an Enthalpy based economizer controller for a local nonprofit radio station's transmitter building. It operates 24/7 and is unattended.

The building is about 12x12' inside, and I have two AC units, a filtered air intake fan (vari-speed) and an exhaust damper. All of these can be controlled by an Arduinio. Sensors are temp & RH inside & outside.

The transmitter exhausts about 1000 watts in heated air into the room. This and sun radiation are the dominant heat sources.

Many will simply throw the air-conditioning at it, full recirculation. But I want to use as much outside air as I can without risking condensation. Desired temp is 60-72 F.

I'm an electronics guy and never took chemistry, so I'm having some trouble beyond basic thermodynamics concepts.

Are there any "rules of thumb" or first order approximations for setting the outside air temp and RH% limit?

Chris Scott
Bowling Green, KY