cooltrain
02-08-2003, 03:55 PM
Hello to everyone. I'm just new in this forum and have read enough to be convinced that I can really learn alot here.
I need your advice on this subject.
We have a high failure rate (leakage) on our chiller barels.
One reason that I can think of is freeze-ups that may occur during loss of charge and water flow failure.
During loss of charge, freezing could occur at the outlet of the EEV extending into the tubes in the barel and causes contraction leading to stress and eventually leakage. Similar thing could happen during water flow failure.
But this freeze-up is suppose to be prevented by the freeze stat.
The stat is set to cut-out at 38deg F. but no trip-off so far has been registered by the stat. It is also proven functional.
The chiller barel is a two-pass counter flow type. I think this is mostly typical.
Refrigerant inlet and outlet are on the same end. The water "IN" is near to the refrigerant inlet and outlet while the water "OUT" is at the other end. Both water lines are on one side.
The stat sensor is located near at the water "OUT" side.
Could this be a wrong location of the sensor? It may not be able to sense the freeze-up near the EEV outlet? Is it supposed to be installed near the EEV outlet where freeze can favourably occur?
i'll be more than happy to hear your comments.
I need your advice on this subject.
We have a high failure rate (leakage) on our chiller barels.
One reason that I can think of is freeze-ups that may occur during loss of charge and water flow failure.
During loss of charge, freezing could occur at the outlet of the EEV extending into the tubes in the barel and causes contraction leading to stress and eventually leakage. Similar thing could happen during water flow failure.
But this freeze-up is suppose to be prevented by the freeze stat.
The stat is set to cut-out at 38deg F. but no trip-off so far has been registered by the stat. It is also proven functional.
The chiller barel is a two-pass counter flow type. I think this is mostly typical.
Refrigerant inlet and outlet are on the same end. The water "IN" is near to the refrigerant inlet and outlet while the water "OUT" is at the other end. Both water lines are on one side.
The stat sensor is located near at the water "OUT" side.
Could this be a wrong location of the sensor? It may not be able to sense the freeze-up near the EEV outlet? Is it supposed to be installed near the EEV outlet where freeze can favourably occur?
i'll be more than happy to hear your comments.