Dear Friends,

In past topic, I asked some question about sub-cooling. Thanks for all of friends participation on my topic and their help and information. I understood lots of things about sub-cooling and It forced me to research and read more sources to realize sub-cooling progress at refrigeration system better.
I saw at several sources and also some of our friends said me in previous topic, At system without receiver tank, Sub-cooling can be indicated by how much refrigerant charge in system. I know this sentence is true but I can not understand why. Would someone help me to understand better why by easy explanation ?

Sincerely yours.