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  #11  
Old 06-02-2017, 12:39 PM
civengpe civengpe is offline
 
Join Date: Nov 2010
Location: Houston, Texas
Posts: 212
Default Real Life Testing Continues

I made a change to the first concept by restricting the exhaust to 2" in order to try to increase the exit velocity. So far that seems like it is working very well. I went out and got an Acu-Rite indoor/outdoor thermometer to check what the temp drop is. It turns out that just because the name inplies accurate, there is a real reason why they misspelled it. The indoor temp looks to be good, but the outdoor one is about 5deg f high. I checked with multiple known accurate devices.

Anyway, I am seeing a real world temp drop of around 20deg f in 82% relative humidity. I am glad to see that since, there won't be much temp drop due to evaporation in this test. More to follow! Oh, It's also a good idea to do some real life testing to verify results!

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Last edited by civengpe : 06-02-2017 at 01:10 PM.
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  #12  
Old 06-02-2017, 12:41 PM
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Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
Default Looks like

what I have in mind for the cockpit of my -10
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Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction

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  #13  
Old 06-02-2017, 12:44 PM
civengpe civengpe is offline
 
Join Date: Nov 2010
Location: Houston, Texas
Posts: 212
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Quote:
Originally Posted by Plummit View Post
Maybe not. When the air gets recirculated back to the cooler, any moisture *should* condense on the cold interior of the chest, which would remove it from the air. Cycling the fan run-time might be possible too.

Adding a radiator and water pump would make it more efficient, but add to the power draw.

~Marc
Yeah, that was why I couldn't just use my B-Kool unit. it draws like 5 amps at 12v. That would kill my little battery pack in no time.

My goal is to end up with something anyone could throw together in an about hour and cost just a few bucks. At the same time utilize materials that can serve dual purposes camping at an airshow. I would really love for it to be small enough even one of you -6 guys could bring it!!!
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  #14  
Old 06-02-2017, 01:49 PM
jchang10 jchang10 is offline
 
Join Date: Nov 2005
Location: San Francisco, CA
Posts: 525
Default

20 AH battery running a .5A fan should run for 40 hrs. The ice prob won't last for longer than a few hours tho. Not bad. Ill eventually make my own too.
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  #15  
Old 06-02-2017, 01:52 PM
charger81 charger81 is offline
 
Join Date: Nov 2008
Location: Texas
Posts: 235
Default

any downside to using milk jugs full of water and then frozen rather than ice? Wonder if the ice would last longer contained in the plastic and also, would relative humidity be lower?
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  #16  
Old 06-02-2017, 01:54 PM
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dpansier dpansier is offline
 
Join Date: Jan 2006
Location: Green Bay, WI (GRB)
Posts: 479
Default

A lightweight USB solar charger could keep the battery pack fully charged.
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Green Bay, WI (GRB)
RV-7 N450DP
W9LYX

Antennas for Experimental Aircraft
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  #17  
Old 06-02-2017, 02:05 PM
civengpe civengpe is offline
 
Join Date: Nov 2010
Location: Houston, Texas
Posts: 212
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Quote:
Originally Posted by charger81 View Post
any downside to using milk jugs full of water and then frozen rather than ice? Wonder if the ice would last longer contained in the plastic and also, would relative humidity be lower?
I agree that it would, but I don't have that available to me every day in HBC. Bagged ice is readily available.

I do keep one gallon frozen milk jugs in my hanger freezer for my B-Kool in the -10.
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  #18  
Old 06-02-2017, 02:07 PM
civengpe civengpe is offline
 
Join Date: Nov 2010
Location: Houston, Texas
Posts: 212
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Quote:
Originally Posted by jchang10 View Post
20 AH battery running a .5A fan should run for 40 hrs. The ice prob won't last for longer than a few hours tho. Not bad. Ill eventually make my own too.
I agree. I have a solar charger that I hook the batter pack to and it barely keeps up with me charging my phone and Ipad. I imagine I could get by with AC charging the battery pack every few days though.

I was able to get about 5 hours with the cooler being about half full last night. I am currently testing a full cooler to see where it starts to drop off. I am at the 3 hour mark and still have a 20deg f drop.
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  #19  
Old 06-02-2017, 06:18 PM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 777
Default

what's that R value for tent walls again?
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n. wi.
dakota hawk/jab 3300 built and flying. sold 6/18.getting serious about the 12. in the hangar now as of 10/15/19
RV-12 kit as of 9/13
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  #20  
Old 06-03-2017, 05:20 AM
madhun madhun is offline
 
Join Date: Jun 2010
Location: Buderim, Queensland Australia
Posts: 153
Default

Great idea. Don't use dry ice.

If you put a damp cloth over the ice it will last much longer.
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Bushby Mustang II - 170hrs and counting
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