Had a ideer for a A/C system
Then when it expands out and becomes a gas again, the temp drops. It doesn't necessarily have to become a gas, but that does help the process.
Simple! The change from liquid to gas and back certainly helps, but is not required. .
Sorry, not true.
Phase change in the refrigerant IS necessary, and FUNDAMENTAL to the refrigeration process.
As I explained earlier, water, as example, only absorbs or gives up 1 BTU / pound per degree of change in temperature F
But it absorbs / gives up nearly ONE THOUSAND BTU of heat energy in the phase change from liquid to vapor or back again.
This compares, as explained earlier, the pittance of change all the way from freezing to boiling, a tiny 180 BTU!!!
It is this TREMENDOUS increase that IS in fact "the refrigeration effect."
(I'm using water only as an example, and water IS the standard that the BTU formula is based upon. IT is important to understand that OTHER substances give up less or more heat per unit weight that water, and this is known as the "specific heat" of the substance. Water is "1" Aluminum is only .22, and Copper is only .09!!!!
(This means that you can change the temperature of a pound of aluminum with only 22% of the heat that it takes to raise a pound of water 1*F
What this means is, it is important to realize that different substances and materials have vastly different characteristics
(On a side note, when I was in the HVAC/R field, "we" almost exclusively used BTUs and 'merican units. You can measure this stuff in anything from calories, joules, moles, or donkies per fortnight.
I drive my car in miles per hour, and I buy my steak by the pound. And even though I live close to the magic line that delineates "the great white north," I think in degrees F. No Michael Moore involved, thank you very much.