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Check your pump curve first regarding pressure etc., but my answer on the speed is that you can't go lower than the minimum speed to remove heat from the pump. A pump can burn up if you don't flow enough water through it. A conservative rule of thumb is 30% minimum speed (18 Hz) for long term...

Assuming the boxes can't be fitted with heater coils, the engineer is correct. I would at least investigate electric duct heaters. Also, you should be able to set a minimum valve position in your VAV box. Be advised that fresh air adds a lot of capacity to your units, and I agree that you...

My understanding is a little different: If you don't cover your sensible load with the air conditioner, you will have problems with reaching the proper temperature. Yes, it will be dryer because you have more than enough latent, but the temperature will be higher at design conditions. You...

As Abbynormal explained, the heat pipe will work as long as there is a temperature differential. The most simple way to explain the benefit of using heat pipe is that the heat pipe moves the sensible heat ratio. It doesn't give you any free energy, but it does convert sensible cooling into...

I just wanted to offer my 2 cents. First, when you reheat, you force the air conditioner to run longer and condense more water out of the air while NOT over cooling. The result is dryer air that is at a more comfortable temperature. Also, reheat allows you to control humidity within a defined...