Most of the worlds cooling systems take advantage of "latent heat". When you heat water it takes 1 calorie per gram to heat it 1 degree C, but when the water temperature reaches boiling, it absorbs 540 calories per gram without increasing in temperature and the result is steam. So you can look at steam as a huge heat battery
. Run the steam outside in a copper tube and evaporate it and it gives up all that heat to the outside air. What you have done with just 1 cc of water is removed 540 calories of heat from inside. Once the water has evaporated back to water outside, it can be brought back inside through tubing and the cycle starts over again in a closed system. That is how air conditioners work, but they use freon or ammonia instead of water (works the same just better). The hard part is getting the liquid inside to boiling temperature without too much energy expenditure. One trick is that you can increase or decrease the boiling/condensation temperature by changing the pressure and that is what the compressor on an air conditioner does. The ammonia refrigerators in our trailers use another method of boiling ammonia out of water using a propane
flame or electric heater and allowing it to interact with hydrogen gas to make a closed system. It is a marvel. The ammonia gas condenses in the back of the fridge
to a liquid and gives up heat to the outside air (discharging the latent heat battery
to stay with the analogy), that returns the ammonia to liquid form; it then runs into the inside of the fridge
where it evaporates and the latent battery
charges by absorbing heat out of the interior of the fridge
, cooling the beer. The resulting ammonia gas is transported back out of the fridge where the cycle repeats. Hydrogen gas and water and the heat from an electrical
heater combine to manipulate this process with minimal energy.
So the processes of the swamp heater are well known, you just have to arrange it in some sort of closed system which doesn't require too much outside energy to keep going.
Sorry for all the words but this is such an interesting topic, and the beer stays cold.
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