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Proposed Evaporative Air Conditioner

Have an idea for a Evaporative Cooler.  In most conventional coolers a fan pulls warm air through a panel that is constantly soaked in water, the water pulls the heat from the air.  Another form of this system is the simple "Mister Jets" that spray a fine mist into the air which pull the heat from the air dropping the temperature.  My idea is a combination of the two... See Image.

The concept is simple...
- Fan pulls warm air in and forces it into the body of the cooling unit.
- A mister sprays a fine mist that combines with the air pulling the heat out.
- To remove the fine air molecules a synthetic membrane (like pond filter material) is used to collect the vapor and allow the air to pass freely through.
- The resulting water will make its way down the membrane and drip into the water basin below.
- The pump will then recirculate the water back through the system.

Seems like an easy enough system, the only problems I can see are...
- Mildew
- Leaks
- Filter doesn't remove all the water

So let me know if you guys think this will work.




Picture of Proposed Evaporative Air Conditioner
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opc1677 years ago
lemonie, Your concept is good, but the air flow will force the water mist straight into the filter, but, you will cool the air. I have a similar idea that is much like yours. I’m building a 2X2X10 feet aluminum casing that will have one chill-cooler on one end, a squirrel fan in the middle and a second chill-cooler on the other end. I will re-circulate well water that is 56 degrees thru these two chillers. Once the water reaches 75 degrees, I’ll open a valve to allow the well pressure to replenish the water in the chillers. I pass the water back into the well underground. On the bottom of the aluminum casing will be a tray to route the moisture to the outside. You concept is exactly the same except you are using an air-space to water down and not a tube like radiator, etc.
andy1917 opc1677 years ago
i would love to see ths as well when you are ready . At work we are working on a conventail chiller attempting to design a kind of steam trap that woudl be adapted to the space above the fan . I was surpised to find out Cal Tech is performing researchon the same thing. They claim it is possible t capture aproximately 80% of the water that evaporates this making the system much more enviromentally friendly. They are studying the science side we are simply using trial and error.
lemonie opc1677 years ago

Sounds interesting that, do eventually show us what you build.
But no filter will trap vapour (as it's a gas), so you'll still have performance drop-off as humidity increases.

L
beehard447 years ago
Your system looks good! You can add chlorine in the water to avoid mildew butthat will give you chlorine smelling air. Your filter can be filter wool used in aquariums. Just stretch it a little so that the air can pass with ease. Any water that lands there will also evaporate, cooling the filter and air that passes through it.
lemonie7 years ago
I'd worry about two things:
>You're filling the room with water.
>At high relative humidity your performance will drop-off.
You'd want to keep taking air from outside, and if it's cool enough at night vent the place to drop indoor humidity
?

L
NachoMahma7 years ago
.  That should work.
.  I doubt that the mist tips will do much more good than trickling the water over your filter pad, but that's just a gut feeling. Others may be able to confirm/deny.
.
.  Mildew (, mold, algae, &c) - if you are using "city water" for you makeup, the chlorine (or other treatment) should kill a lot, but not all, of these. You will need to shutdown periodically (1-2 weeks) to give it a good scrubbing to keep it clean.
.  Leaks - good construction practices will eliminate leaks. If well-constructed, your biggest worry will be blowing water droplets out the exhaust. A long, rising exit duct will minimize that.
.  Filter doesn't remove all the water - see prev paragraph.  Using a "plastic jute" (I can't recall the actual name of that stuff :(   ) filter pad will probably work better than a membrane or sheeting.

.  Mineral buildup will likely be a problem, Soaking parts in vinegar (or other weak acid) should get rid of them.

.  I don't think pre-cooling the inlet air with the water from the pump will do any good. Any heat absorbed at the inlet heat exchanger is just dumped back into the system with the water.
scubaru (author)  NachoMahma7 years ago
RE: I doubt that the mist tips will do much more good than trickling the water over your filter pad, but that's just a gut feeling. Others may be able to confirm/deny.

- I see it as being a bit of both world, for a sec the water droplets will be suspended in the air, then once the pad is soaked it will act similar to a true evaporative cooler.

RE: I don't think pre-cooling the inlet air with the water from the pump will do any good. Any heat absorbed at the inlet heat exchanger is just dumped back into the system with the water.

I think what you are seeing wrong is my interpretation of the supply tube running "behind" the inlet, it is not suppose to be "pre-cooling" the air before the fan, just to clarify that.