Be careful of seaweed, mussels, or other growth that could clog the seawater intakes. A simple addition of chlorine at the intake should minimize problems.
I did some cursory research into this during a study for replacing (not rebuilding) a 600-ton chiller. Trane felt that a VFD was overkill because the vanes in the compressor inlet varied the load enough to reduce operating costs. Trane does not offer the VFD option. However, York claimed a...
ESP is the static pressure "external to the air handler" needed to overcome only the duct friction losses. You can measure this by using a Magnahelic gauge or manometer and inserting the tube in the duct in two places - after the fan discharge and at the return before it enters the...