Wait a minute William,
To answer his question the answer is yes it can be used but not without modifications.
I have been working on several designs trying to come up with the proper solution.
He is just confused about the operation of a stirling system because of the terminalogy.
you cant use r-22a or any other refigerant, because of the boiling point issue. It is a man made gas of several chemicals and a oil for lubrication. Although the term fluid or liquid is used when talking about stirlings they actually mean gas.
The scroll compressor in a refrigerain unit is actually a vapor pumper. The operating pressure for a refrigeration unit is around 250 psi. Some service men have made the mistake of trying to fill a system tooo fast and "slugged" the system. This means it locks up the compressor.
You cant use a gas that has oil in it in a stirling for two reasons. It will clogg up the regenerators and your sytem will lock up. Most importantly never ever put oil in a pressurized system that is under pressure . When oil is compressed it will explode. Ive already heard of one death due to this.
just use atmosperic pressure air till you see if your idea will work.You will have to add more heat but it is safer. If your system works ok then consider a gas to use.
dont use any liquid. If you are heating the hot end and liquid comes back to the heating chamber it will explode. It may not be a major explosion but it will be detenation. It is a form of thermal shock that will cause metal to break to pieces.
The stirling engine can be used as a refrigeration unit but it has to be driven backwards by an electric motor or an other stirling running in the opposite rotation.
The stirling cycle works on compression of gases. compression is heat and expansion is cooling. It may be easier to think of it in high pressure and low pressure.
THe principal is that once somethings heated it cant stay that way it is going to seek cold, without energy such as heat being added to keep it there at the same temperature.
This temperature change is used to create motion. What you are doing is bouncing the gas from one side to the other. If left unheated for a period of time the gases will try to balnce, and equalize , or the motion will stop in other words. A good designed machine will runn off the outside air temp, but its hard to do..
yes a scroll compressor can be used but not like you think. Once you have leniar motion you want to change it to rotary motion but there is a price to pay called friction.
Once you get the compresser turning it goes in only one direction. The gas you just heated up is going to be looking for a low to go to. And after that first big push there is a low at the front of the compresser. it stalls the rotor this is called dead heading. You have built up this pressure and heat and it has no where to go In a alpha.
You have to figure out a way to go around the compresser and get back infront of it, because after that big push now there is a low pressure low temp situation that that hot compressed gas is seeking.
If you use a beta you have to have a regenerator because, that heated gas may have some moisture in it from the compression, and you dont want thermal shock. So you leave some of that heat in the regenerator and burn off any moisture. Remember moisture lowers your temp. too.
You cant use the compressor in the case it is in. It has oil in it and to use it you have to build it inside the engine. Thats alot of machining and design. It is not bi directional , meaning once you have the shaft turning one way it will stop and then go back the opposite direction. All you will get is a rocking motion.
There are ways to make it work but if you try always pull a vaccum first and fill the system with helium. put fittings for a set of regrigeration guage to put the helium in . never use anything oil based on the fittings either.
Remember you are playing with a pressure vessel and chemicals. Consult professional craftsmen like, welders, machinist, millwrights, and fabricators and engineers.