Hi Bandit

Don't know whether you are familiar with Mollier diagrams (PH charts) If not, get someone 'in the know' to drop a system design onto one (preferably with no liquid sub-cooling before the expansion device.) Look what happens to the percentage of refrigerant immediately available for latent heat exchange in the evaporator, a percentage of refrigerant has already been flashed off - reducing the efficiency of the evaporator! After you've done that, do another one, this time with 10 deg C liquid sub-cooling. Notice the difference? The percentage of refrigerant flashed of before entering the evaporator has reduced! The ratio of gas to liquid entering the evaporator is known as refrigerant 'quality'.

Hope this helps you????

Frosty