The issue that I'm having recently at my job is that I know the proper way of charging a txv system is by subcooling and fixed irifice like capillary or piston by superheat. The issue that I'm having with this and pls correct me if I'm wrong when I'm doing refer systems I almost always have a liquid receiver. When we have a liquid receiver then we also dont have any subcooling because gas and liquid coexist inside the receiver. How do we charge the proper way in those situation? Any help would be appreciated .