Hi,
We have a new system that uses a thermosyphon oil cool and are experiencing issues with it and have identified the issue to be insufficient height difference between the drain outlet of the condenser to the inlet connection on the receiver, this appears to be preventing the condenser from draining properly. We are having trouble finding any technical design data on how to calculate the required the required height before we carry out any modification. We have the Frick Thermosyphon oil cooling document but its a bit vague it this area ( condenser to receiver). Can some one please point me towards decent design data?

Spiral Freezer application
Ammonia,
Screw compressor 220 kW @ -41/ 35
108kW oil cooling load
Condenser 880kW ( sized for pull down )


best regards Mike.