What is condenser approach?
Answer:
Condenser approach is the difference between liquid refrigerant temperature as measured on the liquid line, and leaving condenser water temperature.
Normal condenser approach is 0 to 3 degrees.
If approach is 4° or more, it's an indication your water cooled chiller has fouled tubes.
If condenser approach is 4° or more and the condensing water delta t is low, it's an indication of non-condensables in the condenser, insulating the tubes and reducing heat rejection to the water.
With non-condensables, condensing pressure will be higher than normal.
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