REFLECTOR: Coolers
alec
alec at rhodius.com.ar
Wed Jul 11 20:13:00 CDT 2012
I'm also an "Instructables" fan, after going through their site and other ones, decided to build my own for the hot summer days. I had an old ice box in good shape stored away which I didn't want to spoil, so I inserted a removable wooden shelve 3/4 up in the ice box with a handle in the center, installed a car fan at the right side of the handle an made two 4" holes on the left side of the handle where directional pipes direct the "humidified cold air". This unit is power at the 12volt cigarette power plug, added a on/off switch, a test light and a fuse. At the bottom of the ice box I placed a 1/2" plastic cold unit, on top of these, I store the beverages and ice. The handle serves to pick-up the shelve and discover iced cokes & beers! The fan directs the warm cabin air into the unit, passing by the beverages and going out by the directional pipes. I'm very happy with the unit, it's not superb though after 1/2 hour my cabin feels cooler :)
If you would like pictures, please send me a line.
Best regards
Alec
El 11/07/2012, a las 15:47, reflector-request at tvbf.org escribió:
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> 1. Re: A/C (Ruben Creus)
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> Anyoneelseseethis?) (sbjknox)
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> De: "Ruben Creus" <ruben at vainneg.com>
> Asunto: Re: REFLECTOR: A/C
> Fecha: 11 de julio de 2012 15:13:10 GMT-03:00
> Para: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
> Responder a: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
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>
> I saw those, but they release the moister of the ice melting into the air, like spraying water to a fan. While the commercial ones, have a pump and run the water through a radiator and the fan sucks air through the radiator, cooling the air and not releasing the moisture. The theory says that too much moisture in the air also makes you feel warmer… plus the fact the over colder surfaces it could condensate. As always every small thing, seem to carry a bunch of science behind making everything to tricky!
> Ruben G. Creus
> Ë +1.571.215.0025
> * ruben at vainneg.com
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>
>
> From: Peter Braswell [mailto:peter.braswell at gmail.com]
> Sent: Wednesday, July 11, 2012 12:36 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: A/C
>
> I don't have any direct experience with those portable A/C units. I have looked at them and feel like they are really, really expensive for what they are, e.g. glorified ice cooler with a blower. I'm a fan of the site "instructables" and found this:
>
> http://www.instructables.com/id/Portable-12V-Air-Conditioner---Cheap-and-easy!/
>
> As the author claims: a $10 solution for a $500 problem.
>
> Best,
> Peter
>
>
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> On Wed, Jul 11, 2012 at 12:04 PM, Ruben Creus <ruben at vainneg.com> wrote:
> Hi there,
>
>
>
> Gladly temperatures are going down a bit, but August is still to come. I wonder if any of you have any experience with the portable water/ice units to cool down the cabin, or a portable true A/C unit.
>
>
>
> I have an IO-360 and I was thinking on having a permanent A/C unit hooked up into the engine, but that seems to be a very pricy item for just a couple of months of hot weather a year. So, I was wondering about the portable units.
>
>
>
> Ruben G. Creus
> Ë +1.571.215.0025
> * ruben at vainneg.com
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> De: Dave T Nelson <dtnelson at us.ibm.com>
> Asunto: REFLECTOR: BBQ Update! Please Read!! (Grover McNair)
> Fecha: 11 de julio de 2012 15:18:17 GMT-03:00
> Para: reflector at tvbf.org
> Responder a: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
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> Is it too late to get added to this illustrious list? (with two guests...)
>
> Subject: Re: REFLECTOR: BBQ Update! Please Read!!
>
> Here's the current list:
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> 2012 Velocity BBQ Reservations
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> Dave
>
> Dave T. Nelson
>
> STD-RG N22DN
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>
> De: "sbjknox" <sbjknox at earthlink.net>
> Asunto: Re: REFLECTOR: A/C (was Re: GRT Displays overheating - Anyoneelseseethis?)
> Fecha: 11 de julio de 2012 15:45:45 GMT-03:00
> Para: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Responder a: sbjknox <sbjknox at earthlink.net>, Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>
>
>
> ----- Original Message ----- From: "Mark Magee" <edjonesbrady at gmail.com>
>
> Subject: Re: REFLECTOR: A/C (was Re: GRT Displays overheating - Anyoneelseseethis?)
>
>
> [snip]
>> I pulled apart a small roll around 4,000 BTU A/C that pulls 4 amps on the AC
>> I Used camping with the kids. I think 4000 BTU's of A/C would marginally cool
>> an XL cabin on a 100F OAT day. The good part is the whole unit can be run
>> on an inexpensive 1000W sine wave inverter that factoring in 8% efficiency
>> loss it would still only pull about 50 amps on the 12V. I'm hoping a second
>> alternator, possibly a supplenator would fit the bill and double as a back
>> up alternator. As well I might install some 110V outlets for use in flight
>> after the A/C was shut down in the cool air.
>
>
> Some rather creative math going on here...
> Strictly speaking, you can't equate BTU and Watts but common useage of BTU when refering to air conditioning actually is BTU/hour so that 1000 Watts = 3415 BTU/hr and 4000 BTU/hr equates to about 1171 W.
> But the real issue is with the current at 12Volts. Even if you had a sine wave inverter with 92% efficiency (which I believe is overly optomistic) the current at 12V is
> (1171W) / (12V) / (.92) = 106 AMPs!
>
>> I think the whole arrangement with alternator might add 12 lbs.
>
> For 4000 BTU/hr, not likely...
>
> However, your 4000 BTU roll-around unit could not have produced anywhere near 4000BTU/hr if it was only pulling 4A from the 115VAC line. (4A) x (115V) = 460 W.
> (460W) x (3.415BTU/hr/W) = 1571 BTU/hr at 100% efficiency.
>
> So, IF your roll-around unit would "...marginally cool an XL cabin on a 100F OAT day.", then a much smaller (than 4000 BTU/hr) A/C might work and your current draw at 12V would perhaps be acceptable.
>
> Sid Knox
> Oklahoma
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