evap cooler in a bucket

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evap cooler in a bucket

Postby Desert-rat » Mon Dec 02, 2013 1:18 pm

as a desert rat it gets HOT out here in the Mojave.
after last years camping adventure its quite apparent to me that an evaporative cooler will be a nice addition.

so looking about on youtube i discover this gem


and thought it would be good to pass it along as its small
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Re: evap cooler in a bucket

Postby GuitarPhotog » Mon Dec 02, 2013 4:19 pm

If you have 120VAC to run a fan, you might as well run an air conditioner. At least they work in high humidity regions too.

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Re: evap cooler in a bucket

Postby citylights » Mon Dec 02, 2013 7:45 pm

GuitarPhotog wrote:If you have 120VAC to run a fan, you might as well run an air conditioner. At least they work in high humidity regions to.

1. Can work with a DC fan too
2. Fan uses on the order of 1/100th the power of an AC unit.

The idea of using ice blocks is not quite there when you are camping. You would need a lot of gallons of ice block to get you through a 100 degree night.

This is pretty close to a swamp cooler. Needs something to circulate water and media for surface area to evaporate for cooling.

In a simple one they use a bladed barrel with slow revolution in a pool of water with a fan blowing over. The barrel gets wet and provides surface area, the fan evaporates the water and blows cool air at you. That is considered a low density media and you can get a 10 to 15 deg. Temperature drop from about 100 down to 85 deg at best. With a standard commercially available high density media, you can get 20 to 25 deg. temp drop from 100 down to 75. All this assumes very low humidity in the 3-7% range found in the desert southwest. All those numbers go to crap in high humidity environments.

Keep in mind with swamp cooling your insulation doesn't do you much good because you need 100% makeup air from the outside. If you don't have makeup air the added humidity of recirculating kills the cooling potential pretty quick.

With all that said, I am in line for an AC unit and small propane powered generator.
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Re: evap cooler in a bucket

Postby Andrew Herrick » Tue Oct 04, 2016 4:34 pm

Like others have very wisely said, evaporative coolers are a joke in humid climates. Where I live, summer humidity is 80-90 degrees, so I get it ... :x

If you want a true off-grid evap. cooler, though, check out a Zeer Pot. They're REALLY heavy, but I'm sure some genius could modify them for teardrop use :)

... Wait a minute. I just realized you were talking about cooling the interior of the trailer, and not food. Duh! Scratch the Zeer pot idea.

Whether you get an A/C unit (better cooling) or an evaporative cooler (less power), don't overlook reflective curtains, especially if you have a rooftop fan or skylight.
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