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Alan
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« on: March 07, 2010, 10:05:05 AM » |
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So that the manifold is laying on the roof tiles but in a vertical position. Yes / No  Should not have days off, tooo much time tooo ponder. |
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guydewdney
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« Reply #1 on: March 07, 2010, 10:17:10 AM » |
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Nope - cos the thermosyphon won't work in the copper heat transfer tubes.
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KLD
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« Reply #2 on: March 07, 2010, 10:18:26 AM » |
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NO.
At least if we are talking heat pipe ETs. The heat pipe works in a way that you have a loop: small amount of liquid in it, this liquid evaporates, rises to the top where it subsequently re-condenses, and then runs down the pipe as liquid again /loop
Klaus
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Alan
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« Reply #3 on: March 07, 2010, 11:03:13 AM » |
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Thanks for that.
Drove past a house yesterday where the panel has been mounted that way round. Nice job done
getting the pipes through the roof with tile and up stands made from copper sheet.
Tubes not fitted yet.
Had my Navitron tubes for years now. Cant remember any destructions in the box.
regards
Alan
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« Last Edit: March 07, 2010, 11:08:59 AM by Alan »
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Iain
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« Reply #4 on: March 07, 2010, 11:28:06 AM » |
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Hi
Like these?
-possible spam link deleted-
Iain
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« Last Edit: March 07, 2010, 12:54:23 PM by martin »
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1.98kwp PV (11 x Sharp 180 and SB1700)
20 x 65mm Thermal and 180ltr unvented
6000ltr rainwater storage
Plymouth
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charlieb
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« Reply #5 on: March 07, 2010, 02:37:16 PM » |
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Does that mean they CANNOT be mounted horizontally on a flat roof? What minimum angle would allow for thermosyphoning/looping? (not that flat panels would be a lot of good up here in Scotland anyhow)
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Iain
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« Reply #6 on: March 07, 2010, 03:24:59 PM » |
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Hi
Like this then!(no link)
Iain
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1.98kwp PV (11 x Sharp 180 and SB1700)
20 x 65mm Thermal and 180ltr unvented
6000ltr rainwater storage
Plymouth
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KLD
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« Reply #7 on: March 07, 2010, 03:32:24 PM » |
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Iain,
Are these of the type that have a u-pipe in each ET? I believe Navitrons 70mm tubes are like that. As I indicated before, it's how the heat pipes work that puts a limit on at how shallow an angle that panel can be mounted. Whereas with the u-pipes there may even be an advantage in mounting them horizontally, 'cause otherwise emptying during stagnation will be difficult.
Klaus
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Iain
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« Reply #8 on: March 07, 2010, 07:35:30 PM » |
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Klaus
Not sure but will have a look on the website tomorrow.
Iain
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1.98kwp PV (11 x Sharp 180 and SB1700)
20 x 65mm Thermal and 180ltr unvented
6000ltr rainwater storage
Plymouth
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rogeriko
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« Reply #9 on: March 07, 2010, 08:18:38 PM » |
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Do these tubes really have a liquid inside I thought they were just solid copper??
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desperate
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« Reply #10 on: March 07, 2010, 08:45:59 PM » |
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Rogeriko
As Klaus hinted at it is the phase change from liquid to vapour and back again that transfers the heat up to the manifold, a solid bar of copper would have nothing like enough conductivity to transfer the heat.
There is another design that has a wet joint at the manifold and the water is pumped through the pipe, this, I think, is a slightly more efficient method of transferring the heat, but having 40 nitrile O rings in each panel is a disaster waiting to happen.
Desperate
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