Hi all,
can anyone help
We have an air cooler chiller with a closed looped system wtih chill water pumps and 4- 40 ton air handler units.

I have having some heat exchange problems That I cannot seem to solve.

I have water leaving at 45 degrees and returning at 48 to 50 degrees.

I have sox ducts on the AHU which tend to drop I have done a full coil cleaning and can say the coil is clear and air passes through. I cannot remmeber the CFM of the unit at the momnet but last it was checked it was with in range.