New to low temp system need advice and explanations

[Knoxcx]

I just came from a test lab that tested commercial and residental package units and now i have moved to a new company that deals with small commercial food equipment.

First off the refrigerant type i deal with is 404a and R290 (propane). I test alot of cold tables, cold rails and freezers these are all prototype units.

My biggest question is i have noticed that if i go by temp and pressure in these systems i show that i am condnesing from a gas to a liquip and then back to a gas before it exits the condenser coil so i end up with superheat and i have yet to be able to get any subcooling out of these types of units. They have no sight glasses. I have asked a few folks but no one has been able to explain this and i think they think i am crazy. Its almost like the condensers used have to much pressure drop but im done trying to make sense of it need an experienced person to explain this.

[VTP99]

How are you measuring sub cooling ?

[BBeerme]

Yeah, you need a lot more details for us to have a clue what you are talking about.

[Knoxcx]

Liquid line temp minus the saturation temp indicated on the guage set same way i have been doing it for 15 years lol I belive the liquid line reciever is why i cant actually see any subcooling i have measured the incoming side and the outgoing side. The unit doesnt have a sight glass to tell if i actually have liquid to the txv.