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Redneck AC

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djdurrett
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124 Posts

Initially Posted - 05/20/2010 : 13:16:27

Cooler $19
Bilge Pump $19
Bilge Pump Hoses $7
High CFM 120mm Computer Case Fan $5
89 Camaro Heater Core $25
Bag of ice $2.95
Assembly a 6pack
Cooling your boat with redneck AC... Priceless!

http://twitpic.com/1panxo

"Belafonte"
79 C25 TR/FK #1130
Bay View Marina
Lake Ray Hubbard
Dallas, TX

Edited by - djdurrett on 05/20/2010 13:28:09

djdurrett
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124 Posts

Response Posted - 05/20/2010 : 13:25:26

Oh and by the way. IT WORKS VERY WELL! Just make sure to be ready for the condensation on the heater core!

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redeye
Master Marine Consultant

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3476 Posts

Response Posted - 05/21/2010 : 03:44:33

Ah... fun in the south. I've never made one but my brother has. AC was invented in Apalachicola, Fla. where hot is humid beyond belief. Next you will be adding a saltwater refrigerant!

I suggest we add a line with a weight that drops down into the deep cool water and brings it up for the radiator, but then I'm sure you have already been thinkin on that ....

I can see it now, a radiant hull boat design that uses deep water to cool the cabin.... now where did I put that patient application???

Edited by - on

hinmo
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USA
248 Posts

Response Posted - 05/23/2010 : 09:43:03

unbelievable!

and, I see a cruiser, a dirtbike and a beer in the photo....got alot in common!

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Dave5041
Former Mainsheet Editor

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3758 Posts

Response Posted - 05/23/2010 : 13:44:38

<blockquote id="quote">quote:<hr height="1" noshade id="quote">I suggest we add a line with a weight that drops down into the deep cool water<hr height="1" noshade id="quote"></blockquote id="quote">
Already on the market. P/S tested it and it didn't work. Ya'll jest hafta lug that cooler aroun an drink the beer afore it gits warm.

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Leon Sisson
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1893 Posts

Response Posted - 05/23/2010 : 15:53:28

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by djdurrett
 Cooler $19
Bilge Pump $19
Bilge Pump Hoses $7
High CFM 120mm Computer Case Fan $5
89 Camaro Heater Core $25
Bag of ice $2.95
...<hr height="1" noshade id="quote"></blockquote id="quote">
I'm assuming the Camaro heater core was arbitrary. Seems like any heater core or similar should work. 'Most any junk car in the weeds out back has probably still got one in it.

The high performance PC geeks are getting more involved in liquid cooling. The custom cooling systems they're putting together use 12.VDC pumps, some of them with hoses up to 1/2". I'm guessing those pumps are not only quiet, but might be more energy efficient than a bilge pump. I seem to remember them being around $30.

Has anyone done the calcs on how much melting ice = how many BTUs?
And how many pounds of ice per hour it would take to equal a cheap 5,000 BTU window A/C unit? Even if it wouldn't cool the whole boat, or not for long, maybe Redneck A/C could still make the quarter berth more comfortable overnight when the outside heat load isn't so bad. I'd be tempted to arrange for the condensate to drain into the ice reservoir.

-- Leon Sisson

Edited by - on

Dave5041
Former Mainsheet Editor

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3758 Posts

Response Posted - 05/23/2010 : 18:59:21

Heat of fusion on water is about 334 kj/kg, so 1 pound of ice melting to water absorbs roughly 170 BTUs. The problem is that 30 lbs. of ice absorbs about 5000 BTUs and it is gone while the ac unit regenerates, so it is pretty hard to compare. A resting adult radiates about 60 watts or 180 or so BTU/hour, assume a big chunk for initial cooling, inefficiency in the system, no insulation and, thats a lot of ice

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Leon Sisson
Master Marine Consultant

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1893 Posts

Response Posted - 05/23/2010 : 19:31:36

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave5041
 ...30 lbs. of ice absorbs about 5000 BTUs... thats a lot of ice.
<hr height="1" noshade id="quote"></blockquote id="quote">Thanks, Dave. I suspected the Redneck A/C concept might require more ice than would be practical. Just wasn't sure of the numbers. I thought I remembered this topic having been covered before, but my search didn't find it.

-- Leon Sisson

Edited by - on

redviking
Master Marine Consultant

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1771 Posts

Response Posted - 05/26/2010 : 13:02:48

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Leon Sisson
 <blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Dave5041
 ...30 lbs. of ice absorbs about 5000 BTUs... thats a lot of ice.
<hr height="1" noshade id="quote"></blockquote id="quote">Thanks, Dave. I suspected the Redneck A/C concept might require more ice than would be practical. Just wasn't sure of the numbers. I thought I remembered this topic having been covered before, but my search didn't find it.

-- Leon Sisson

<hr height="1" noshade id="quote"></blockquote id="quote">

Dry ice is amazing stuff - but kinda dangerous

sten

Edited by - on

Dave5041
Former Mainsheet Editor

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3758 Posts

Response Posted - 05/26/2010 : 21:27:31

-80º - not sure what liquid you would use to circulate

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