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water or oil cooling??

A place to ask general spud cannon related questions.
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Unread postAuthor: jimmy101 » Sat Jul 17, 2010 12:12 pm

jackssmirkingrevenge wrote:Doesn't look very safe...

Ya, a ground-fault circuit breaker (GFI) would probably be a good idea.

(In the US, most homes built in the last 20 years or so already have GFIs in the kitchen, bathrooms, garage and outdoors.)
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Unread postAuthor: psycix » Sat Jul 17, 2010 1:31 pm

A fridge compressor? It looks like an electrolysis machine to me...

Stop doing stuff with water. Its dangerous in your hands.
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Unread postAuthor: POLAND_SPUD » Sat Jul 17, 2010 4:54 pm

just the bottom of it is under water...
anyway the compressor is connected to the tank, gauge & fittings via 8 meters of 4X2 tubing...
so it's not that it is dangerous

so far it seems quite promising... after 1 hour of continuous work the water increased temperature to 40 deg C and the top of the casing was only slightly warmer... I really have to find a way to seal it & immerse it completely and/or use more water
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Unread postAuthor: Crna Legija » Sat Jul 17, 2010 8:41 pm

I think if you tap two holes at the bottom and connect a small car radiator it would be better.
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Unread postAuthor: psycix » Sat Jul 17, 2010 11:21 pm

-_- wrote:I think if you tap two holes at the bottom and connect a small car radiator it would be better.

I know it will be better.
Cool the oil!
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Unread postAuthor: Hotwired » Sat Jul 17, 2010 11:26 pm

Why not think out of the pump housing. Feed it chilled air :)

Ironically this will need another pump and radiator system to cool the air but don't worry about that. At least the air con will be working as designed :P
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 18, 2010 12:31 am

I still think an improvised radiator will suffice, using steel wool as Rag had suggested. At least it will stay dry :)
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Unread postAuthor: Hotwired » Sun Jul 18, 2010 2:35 am

What is the purpose of the steel wool?

Compared to just having a fan blowing air over the casing.

It's got a lot of surface area but it's got very very little of that in contact with the paint of the casing.

It also restricts airflow somewhat.
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 18, 2010 3:16 am

That's the point of the sheet metal, it would increased the contact area with the casing.
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Unread postAuthor: POLAND_SPUD » Sun Jul 18, 2010 3:35 am

I think if you tap two holes at the bottom and connect a small car radiator it would be better.

I'd have to drill and tap two holes.... With this deigns I just have to seal it perfectly and voila - it works

Of course, I might as well use a car radiator with this design. it would be a lot easier to tap holes in a large plastic bucket/barrel or some other container
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Unread postAuthor: spudamine » Sun Jul 18, 2010 7:38 am

I still think an improvised radiator will suffice, using steel wool as Rag had suggested. At least it will stay dry

I've got something a little bit like your diagram, twin 40w fans on the ends in a push pull setup but no steel wool, it works very well without it thankyou :)
Like hotwired said I think adding steel wool would just reduce the airflow. steel is also a poor conductor of heat compared with aluminium or copper, would be hard to ceate a good thermal junction to the case with and individual strands would be too thin to conduct much heat away anyway. actually, I think you would just end up insulating your compressor :lol:

@ poland, that looks effective but also obscenely dangerous. As I said before (and others) cooling the oil has a lot of potential, you can then get rid of the oil-case thermal gradient, which may only be a few degrees, but as you are limited by ambient temperature it's quite significant.
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Unread postAuthor: POLAND_SPUD » Sun Jul 18, 2010 8:02 am

damn... that looks great :shock:

you can then get rid of the oil-case thermal gradient, which may only be a few degrees, but as you are limited by ambient temperature it's quite significant
I am not limited to ambient temperatures... Mains water has temperature of about 7 deg C so I might as well use water that will be lost anyway (for irrigation) to cool the compressor

Now I only have to find a way to perfectly seal the 3 pin connector
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