<pjvannoor...@caiway.nl> wrote:
> I would compare the system R.Mills is building with an refrigerator or an > airconditioner. > The proof of principle that compressed air that expands > cools down is not to difficult to demonstrate. > Let a compressed spray expand into open air. You see freezing of the > expanding liquid. > But to make a system that regenerates the expanded liquid and compresses > it again in a > continous loop is much more complicated. > That's a good example. Sometimes the early example of a machine is quite different from the modern version. Some of the early heat engines (steam engines) worked in ways that we would never think of today. For example, they did the mechanical work when the steam condensed, pulling the piston in, instead of pushing it out. There were many interesting approaches to refrigeration. They were invented earlier than people realize. There were commercial ice-making machines manufactured in France and elsewhere in the 1860s. - Jed
