This is a video of one aspect of my alternate energy research.
Whatever you are, wherever you are, you're gonna need refrigeration to preserve stored food, and some hot or cold air would be nice to have in your cave too! This pneumatic A/C unit is the size of a golf ball! What you get is cold air out of one end, and hot air out of the other. It is adjustable so as to favor hot air or cold air production. There are NO MOVING PARTS inside and I open it up in the video to show you. Air blows out two ends of its cylindrical body. One end is just a threaded nipple, and the other end has a tube with an exhaust adjustment at its end to vary the fractions of cold and hot air. Inside is a plastic deflector (vortex generator) and an o-ring to seal it all up. The only other part is the standard, quick-release air fitting. That's it! Compare that simplicity to the A/C on your house, in your car, or behind your refrigerator.
How it works (in layman's terms): All fluids (air can be considered a fluid) have a fraction of cold molecules and hot molecules, all of which exist together in random motions. If you can separate the molecules, then you can use each (hot or cold) to your advantage. The trick, of course, is in separating them. Mother Nature does something like that in a tornado, and PneuAC Gamma is essentially that - a tornado-in-a-can! In a tornado, the temperature differences in the air are quickly equalized through a thermal energy exchange resulting in a vortex. As the air swirls around it is thrown outward centrifugally which forms a vacuum in it's center, where you and your house might get lifted up out of Kansas. PneuAC Gamma kind of does it all in reverse order. Air is forced into a rotation by the plastic deflector and the hotter air molecules quickly migrate out of the center and get thrown against the wall of the exhaust tube which causes great friction and heats up the tube and the air as it escapes. The cold air molecules don't move much and stay in the vacuum center where they are further cooled being trapped in the center of the vortex away from the hot molecules and at low pressure. The cold fraction migrates down the middle of the hot tube until it hits the end adjustment where the hot air is hogging up the annular (ring shaped) exit and so they all migrate back down the middle of the vortex to the other end and exit. Thus, hot air exits out of one end (through the tube), and cold air exits out of the other end.
How cold and how hot depends on several variables. Generally, it will generate a temperature difference of about 70 degrees Fahrenheit from ambient air temperature (+77 F and -77F), and true to form, it does exactly that in the video. The ambient air read 77 F and the ends reach 145 degrees F on the hot end and 0 degrees F on the cold end (after I realized that I had re-adjusted it for another experiment, sorry:). The cold air (0F) is well below freezing (32F), so the water vapor in the surrounding humid air is frozen and I wipe some off my thermoprobe at the end of the video. Normally, the whole cold end has a thin layer of frost on it (not as obvious in the video), and so will your hand if you cup the cold air coming out. The air coming out of the hot end is of course hot, and if you grab the hot end tube then you will feel that it is very hot also! The second video clip shows the most basic example of configuring it as a refrigerator.
PneuAC Gamma is amazing due to it's utter simplicity and compactness. I call it 'Gamma' because it is not my first choice to use as an A/C (and not even my second choice), but if the civilized world ends tomorrow, then it IS readily available. My first choice is completely awesome! You will not see it yet, of course, but I will tell you that it is the most revolutionary and most efficient method you will ever see. I know of similar research currently being conducted, so I decided to hold off perfecting my preferred A/C until they are done with their research, so I don't have to do it all by myself:)
Music: David Bowie & Queen - "Under Pressure" Best Of Bowie