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  #21  
Old 06-03-2017, 05:45 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
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to add a little perspective to how much cooling you can expect a gallon of ice at 10 deg f will give off, between temp rise to 32 deg. and changing from solid to liquid , around 1200 btu. if it lasts 3 hrs that's 400 btu per hour.
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  #22  
Old 06-03-2017, 07:53 AM
civengpe civengpe is offline
 
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Location: Houston, Texas
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Quote:
Originally Posted by bobnoffs View Post
to add a little perspective to how much cooling you can expect a gallon of ice at 10 deg f will give off, between temp rise to 32 deg. and changing from solid to liquid , around 1200 btu. if it lasts 3 hrs that's 400 btu per hour.
I'm really just trying to have cool air that will blow directly on me. I don't think I could ever hope to actually cool the entire tent to any appreciable degree.
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RV-10
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  #23  
Old 06-03-2017, 07:58 AM
civengpe civengpe is offline
 
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Location: Houston, Texas
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I ran the franken cooler yesterday for about 6 hours. The exhaust temperature was 20deg cooler than ambient for the first 3.5 hours, then it rapidly decreased to 10deg. I think this was the point that all of the ice was submerged in water. Prior to this there was much more surface are for the air to interact with.

I think this would still serve my purposes since it is usually pretty cool by then anyway. So, in the light of keeping it simple and not over complicating this, I ordered a USB aquarium pump and PC cooing radiator to see how far I can push this.

https://youtu.be/QTnXE3VkohY
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  #24  
Old 06-03-2017, 03:29 PM
Swoda Swoda is offline
 
Join Date: Nov 2016
Location: McAlpin, FL
Posts: 33
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Add a drain hose to drain water out of the cooler and away from the tent.
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  #25  
Old 06-04-2017, 10:24 AM
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bkervaski bkervaski is offline
 
Join Date: Mar 2017
Location: Birmingham, Alabama
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Guys,

We build these .. and they work great ..

https://www.youtube.com/watch?v=HxSLbpAwibg

If you want to get sophisticated, get a radiator in there .. but what I do differently is put the ice ABOVE the radiator so the radiator stays wet the entire time, just let it rest on the radiator. I built one that has a liquid cooled radiator from an old PC cooling system that I never installed.

Also, make your own ice in the form of big blocks in your home freezer if you can, the blocks last twice as long as bagged ice. Some of us use large plastic water bottles or even those cooler packs.

Also, good quality LiFE battery packs and match perfectly with the fan design voltage, even if you have to use a cheap regulator .. we use these - http://www.lifesourcebatteries.com/

Depending on ambient and humidity and whether or not you have a radiator these can last up to 4 hours before they start falling off. The battery+fan will run for days.

Also .. if camping .. ditch the memory foam and go with inflatable .. much much cooler
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Last edited by bkervaski : 06-04-2017 at 10:47 AM.
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  #26  
Old 06-04-2017, 12:54 PM
civengpe civengpe is offline
 
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I decided to try out a small PC radiator And USB aquarium pump combo. The parts came in today and I quickly scabbed together a test unit. So far, the test have been very promising. I am able to see a 46 deg f drop in temperature at 82% humidity. I am concerned about the ice longevity though. I am still powering everything via my USB power pack and am estimating a 1000ma draw. If all goes well today, I'm going to start fabricating the final unit tomorrow evening.

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  #27  
Old 06-04-2017, 01:05 PM
civengpe civengpe is offline
 
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Location: Houston, Texas
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Quote:
Originally Posted by bkervaski View Post
Guys,

We build these .. and they work great ..

https://www.youtube.com/watch?v=HxSLbpAwibg

If you want to get sophisticated, get a radiator in there .. but what I do differently is put the ice ABOVE the radiator so the radiator stays wet the entire time, just let it rest on the radiator. I built one that has a liquid cooled radiator from an old PC cooling system that I never installed.

Also, make your own ice in the form of big blocks in your home freezer if you can, the blocks last twice as long as bagged ice. Some of us use large plastic water bottles or even those cooler packs.

Also, good quality LiFE battery packs and match perfectly with the fan design voltage, even if you have to use a cheap regulator .. we use these - http://www.lifesourcebatteries.com/

Depending on ambient and humidity and whether or not you have a radiator these can last up to 4 hours before they start falling off. The battery+fan will run for days.

Also .. if camping .. ditch the memory foam and go with inflatable .. much much cooler
When I first started kicking this idea around, I saw tons of different ideas and configurations out there. None of them utilized USB. Since, that is the most available power for me at the airshows, I decided to give it a shot. So far, I'm pretty happy with the out come.

I am intrigued with your idea of having the radiator under the ice. How would you be able to pass air through it? Right now, I have mine mounted on the underside of the lid with a small USB aquarium pump (40gph) mounted on the bottom of the cooler under the ice.

I agree that block ice is MUCH more efficient, it's that I don't have that available to me at the airshows as readily as I do bagged ice. I wanted to run my initial est using what I would have.
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  #28  
Old 06-06-2017, 07:03 AM
civengpe civengpe is offline
 
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Location: Houston, Texas
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Here are some photos of the finished product. All I need now is the exhaust hose and that should be in early next week.










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Last edited by civengpe : 06-06-2017 at 09:09 AM.
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  #29  
Old 06-06-2017, 07:08 AM
civengpe civengpe is offline
 
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Location: Houston, Texas
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List of Materials:

USB Fans $17 https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
USB Pump $9 https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
PC Radiator $17 https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Exhaust Hose $14 https://www.mcmaster.com/#56385k116/=17y8iyo

Any ice chest will do. You could even use a styrofoam one if you wanted.
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Last edited by civengpe : 06-06-2017 at 07:19 AM.
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  #30  
Old 06-06-2017, 08:39 AM
ccrawford ccrawford is offline
 
Join Date: Jul 2005
Location: Denver, CO
Posts: 295
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Your first picture shows up, but the rest are broke. Would love to see them!
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