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billyq, That's what I would do as far as getting your pressure setpoint. After you check the system in full outside air mode, you would probably want to put it in full return air mode and check the performance of each air handler just to make sure that adequate return air is available to each...

billyq, The return air plenum pressure needs to be measured on the discharge side of the return fan. I have never done this with one return fan and multiple supply fans, I've done it the other way around. It should still work though. The plenum (or duct, depending on your set-up) static...

Fan tracking can work if both fans are exactly the same and care is taken to ensure that minimum outside air requirements are met. However, in my experience it is often unstable and leads to building static pressure problems, especially if two supply fans are being used with one return fan or...

I worked on a building with two return fans and one supply fan. After trying several control strategies, the one that worked the best was controlling the return fans to maintain a set discharge pressure. The set point was just slightly positive (.05" w.g.). This allowed the return fans...

It's going to be expensive to cool that kind of space mechanically. That's why the swamp coolers were there in the first place. If mechanical cooling is really the best system, you may look at only conditioning the lower 6 ffet or so in the space. You could provide some relief vents...

Bundy, Regarding the run around coil heat recovery system, it may or may not be an effective system for your design. With high air flow rates and large temperature differences from inside to outside, it can be a good investment. Lower airflow rates and increased distance between inlet and...