A modified evaporative cooler for solar camping - Page 3 - Fiberglass RV


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Old 04-22-2015, 11:11 AM   #29
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Originally Posted by Bob Miller View Post
Tesla is the worlds unsung electrical genius, but even he couldn't do that.
Poor man died penniless and insane, surrounded by his own inventions. He invented AC power basically. Transformers, motors......
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Old 04-22-2015, 11:49 AM   #30
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I have a friend in Germany that was working on Tesla inventions and he has come up missing. Google. Klaus Kruger Heilbronn Germany
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Old 04-22-2015, 12:49 PM   #31
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I have a friend in Germany that was working on Tesla inventions and he has come up missing. Google. Klaus Kruger Heilbronn Germany
I think that he was last seen boarding an AsiaAirlines flight to either Borneo or Timbuktu depending on which way that pilot wanted to turn as soon as "Da Plane" was over water.LOL
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Old 05-04-2015, 02:29 PM   #32
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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 or propane 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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Old 05-04-2015, 02:52 PM   #33
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For those of you that love this stuff, a little more detail. In the ammonia fridge in our trailers, there is no compressor and being a closed system everything is at the same pressure (about 300psi). So how does the ammonia boil in one part of the system and evaporate in another?? Another trick is to utilize Dalton's Laws. When you mix 2 or more fluids, the total pressure is the sum of the individual (partial pressures). In the fridge everything is at one total pressure, BUT in one part of the fridge the ammonia gas is mixed with hydrogen and so the ammonia acts as if it were at a lower than 300psi pressure because it represents only part of the total pressure, the hydrogen is the other part and the sum equals 300 psi. So the ammonia boils at a lower temperature...because of the presence of hydrogen. After the boiling, which sucks the heat out of the beer, the ammonia gas is absorbed into water. Ammonia and water have an affinity for one another and so combine when they meet one another. The water/ammonia solution is now heated by the propane flame, which separates the ammonia gas. The ammonia gas now is separated from the hydrogen (by the water), so behaves as if it is at 300psi as there is no other substance to use up partial pressure. That promotes condensing (things condense better at higher pressure), and in the condensing, the heat is given up to outside air. Is that a wonder or is that a wonder? I can't drink a beer at a picnic table without toasting John Dalton.


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Old 05-04-2015, 03:00 PM   #34
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Clip: "So the processes of the swamp heater are well known"


"Swamp Heater" I thought that we were talking about something entirely different????


As I only have an 18th grade education, maybe you can boil your information down to my level of understanding.
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Old 05-04-2015, 03:04 PM   #35
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I was thinking that exactly what Doug L has done. I won't remember any of it, but I think I understood it.
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Old 05-04-2015, 03:16 PM   #36
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Doug, Thank you for that concise explanation of absorption refrigeration. A dark art to most.

It should be noted that the BTU value that they achieve is comparatively low compared to a compressor style heat pump.
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Old 05-04-2015, 03:31 PM   #37
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Dleverton, Whild building this unit, why not make Moonshine with the heat part and make some $$$ in the process.
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Old 05-04-2015, 03:34 PM   #38
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...... Is that a wonder or is that a wonder? I can't drink a beer at a picnic table without toasting John Dalton.
Some of the best brains worked on this long time ago. Don't for get Albert Einstein and Leo Szilard, who have a patent on absorption refrigeration. Raise a bierstein for them as well.
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Old 05-04-2015, 04:04 PM   #39
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I like the still idea. Cool your trailer and get moonshine as a by product.


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Old 05-04-2015, 04:09 PM   #40
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Hey Paul. I never knew about Einstein and Szilard being involved. There is a Wikopedia write up. Thanks for that, and I've finished the Dalton beer, so I'll open another to toast E and S.


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Old 05-04-2015, 04:29 PM   #41
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It is happy hour here. Cheers!
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Old 05-04-2015, 04:41 PM   #42
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That Einstein guy sure was smart

The patent drawing for an absorption fridge.
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