lv frigo
31-07-2011, 03:28 PM
Hello everyone!
I have a problem with vibrations in the liquid line at the plant for the deep freezing.
The plant is very simply, with one compressor Bitzer HSN 8571-125 with economiser, one Guntner blast freezer, air cooled condenser and liquid receiver 300 lit.
Q=75 kw at -44C/+40C, liquid subcooling 39K, superheating 7K.
Expansion valves: 2 x TES12 (06) - Danfoss recommended 07 (but the vibrations in liquid line begin immediately)
Solenoid valves: 2 x EVR10 (16 mm)
During operation of the plant suddenly appearing vibrations in liquid line. Working conditions are within a values given Bitzer software. Sometimes the temperature of the subcooled liquid is too low (-7C) and it occurs when the level of liquid in the sight glass at the outlet of the receiver starts to decline. If a flow complete stop, starts vibration.
If we close the solenoid valve during operation of the plant (compressor is operated), we feel only a slight impulse to return liquid line. When after a short time we open solenoid valve, after the initial start pulse vibration weak to eventually increase. So many are accompanied by a strong sound that can cause fracture of the pipe or some of the components of the pipeline. This is a fact that we have proved.
It is possible that during the operation of some electrical components to supply solenoid valve (relay or contactor) interrupts the power supply and it includes and excludes. But it can not yet prove it.
Because we have two valves that are open simultaneously, just by closing a valve reduces the flow through the economizer and come up with the increased liquid subcooling. If only one valve (or both) reopen the noise or vibration occurs.
Please help if someone has had similar symptoms or experiences with the described problem.
Thank you for all information
I have a problem with vibrations in the liquid line at the plant for the deep freezing.
The plant is very simply, with one compressor Bitzer HSN 8571-125 with economiser, one Guntner blast freezer, air cooled condenser and liquid receiver 300 lit.
Q=75 kw at -44C/+40C, liquid subcooling 39K, superheating 7K.
Expansion valves: 2 x TES12 (06) - Danfoss recommended 07 (but the vibrations in liquid line begin immediately)
Solenoid valves: 2 x EVR10 (16 mm)
During operation of the plant suddenly appearing vibrations in liquid line. Working conditions are within a values given Bitzer software. Sometimes the temperature of the subcooled liquid is too low (-7C) and it occurs when the level of liquid in the sight glass at the outlet of the receiver starts to decline. If a flow complete stop, starts vibration.
If we close the solenoid valve during operation of the plant (compressor is operated), we feel only a slight impulse to return liquid line. When after a short time we open solenoid valve, after the initial start pulse vibration weak to eventually increase. So many are accompanied by a strong sound that can cause fracture of the pipe or some of the components of the pipeline. This is a fact that we have proved.
It is possible that during the operation of some electrical components to supply solenoid valve (relay or contactor) interrupts the power supply and it includes and excludes. But it can not yet prove it.
Because we have two valves that are open simultaneously, just by closing a valve reduces the flow through the economizer and come up with the increased liquid subcooling. If only one valve (or both) reopen the noise or vibration occurs.
Please help if someone has had similar symptoms or experiences with the described problem.
Thank you for all information