Hi LC,

The project I worked on used a simple shell & tube heat exchanger for the chiller and condenser (about 15 years ago).

The water that was flowing through the chiller was the grey water (I think this is the correct term) from the sewage treatment system. It is essentially clean water (all solids removed), but non-potable.

All of the solids and and other material were removed before the water flowed to the chiller.