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mattie

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Reply with quote  #1 
Spotted this on my wanders around the interwebz and said i would post.
http://www.smokelessheat.com/thermal-storage-tanks/250-gallon-propane-tank-with-ports

Makes sense to have vertical ,taking into account aspect ratio(GH post) for optimal stratification. Would need to insulate heavily.
Regards Mattie

Garage_Hermit

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Reply with quote  #2 
Well spotted, Mattie,

That is a mean tank !  It is interesting to see that somebody has thought to convert one...

In my numbers, I think that makes 1000 liters, for less than 600 Euros, which looks *very* competitive vs a standard HW heater
(400 E to 600 E for a 300-liter model); also, with the ex-propane tank, one is not paying for the electric heater element...


Related discussion about recycling of propane tanks here... http://forum.solar-electric.com/showthread.php?2820-Newbie-question-Storage-tank-Old-propane-tank/page2

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilĂ " unless talking musical instruments...
mattie

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Reply with quote  #3 
Heres another question would it be possible to easily cut and weld smaller size gas cylinders together? I'm thinking stacked vertically, would the welds be strong enough? This would give a smaller diameter and more height which would be ideal for aspect ratio.

Ensure cylinders are completely emptied for safety reasons of course!!!!

This is the kind I am talking about.


gas.jpg15kg cylinder = 35.7 litres ,
47kg = 93- 94 litres
Could look to the largest ones possible for domestic use either butane or propane lpg etc . And hopefully be possible to join two (depends on application) of them in order to limit the work involved.
Regards Mattie 



Garage_Hermit

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Reply with quote  #4 
I'm no welder, but I believe a weld is actually stronger than the materials it joins...

(it actually looks like it already has been welded, around the middle...)

It would be an extremely specialist job, for a start...

Like U say, it would need EXTREME cleaning, since folks have been killed just welding simple old oil drums...

No problem why it should not work, though.


One could take advantage of the open configuration, to install a heat-exchanger coil before joining the two tanks...

Another question just as important as the welding, would be how to cut access ports for stub fittings and unions: would be a lot of bother...

Personally, I'd just go for the big tank U posted previously...

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilĂ " unless talking musical instruments...
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