I have started doing work for a trout hatchery that cools the water with a plate heat exchanger and glycol. The chiller , that cools the glycol is only running at 58% capacity with glycol on temp at 7 C and off at 4 C. The water incoming temp is 18 C and off at 12 C. The hatchery water temp is slowly climbing and I need to sort it out. Would the above temps indicate a fouled heat exchanger which would be holding the chiller down to 58%. The glycol setpoint is 5.5 C.
Any advice would be appreciated.