Ok, here's the semi-blind leading the blind.:whistling2:
The way I see it, and I'm sure I'll be corrected if I'm wrong, is.....
Mechanical refrigeration as we know it today is largely possible because of the principle stated in Boyle's law.
As the pressure on a liquid increases, it's boiling point increases.
You can't boil water at 212 degrees if it's under pressure. You can superheat water to 500 degrees if it's under enough pressure in a pipe or containment vessel, and it still won't boil, because there's nowhere for it to expand into gas or vapors. If you did that, the water would technically be superheated 288 degrees, or it's heated 288 degrees past it's normal boiling point. The same applies to r-22 or any refrigerant. Refrigerants have vastly lower boiling points than water, which makes them suitable for absorbing more heat under less pressure, then releasing it in good amounts by simply lowering the pressure outside of the area to be cooled..
If we can get a refrigerant to absorb a lot more heat that it normally would, by keeping it in a pressurized system, then we can transfer that superheated refrigerant to another area, lessen the pressure on it, say by allowing it to expand through a txv, and it will boil into gas, and release it's heat, or a lot of the heat anyway.
Remember that boiling, or turning into vapor and gas, releases heat from whatever's boiling. That allows us to release the heat from your fridge interior into another area, say your kitchen, by compressing the refrigerant enough so that it absorbs heat from the interior of the fridge, putting the refrigerant in a superheated condition,then allowing it to boil and release its heat outside the fridge, like from the coils on the back of your fridge. The txv or whatever valve is used on your fridge is the way to control the boiling/expansion of the superheated refrigerant coming from the inside of your fridge.
Air conditioning uses the same principle, but collects the heat in your room, superheating the refrigerant because its in a pressurized line, then moving the refrigerant outside your room and allowing it to naturally expand and release its heat outside.