Hi!
I need your help to understand something about subcooling...
In particular i don't uderstand why a low subcooling (less than 4°C), in some case, takes place
when there's a lack of refrigerant.
In my opinion, i belive that a lack of refrigerant should cause the increase of subcooling, bucause the energy provided from the air (system condensed in air) is moved to less quantity of refrigerant.
I think it is the same situationt that occurs when i cool by outside a flow water in a pipe. If i decrease the flow, the temperature of the water decrease (DT).

TX!