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Posted by Sundug on July 19, 2007, 1:35 pm
 

Thermosyphon action is driven by gravity, so the larger the height
difference between the warmer and cooler ends, the greater the flow,
everything else being equal. Gravity flow works better with a large
height difference, and low restriction to flow. Doug


Posted by Malc on July 19, 2007, 8:25 pm
 
Sundug wrote:


Now the problem I have is that you and Morris are sort of contradicting each
other. And I can see the logic in what both of you have said.

Hmmm <scratches head>

--
Malc

If you're swimming in a creek
And an eel bites your cheek
That's a moray




Posted by Morris Dovey on July 19, 2007, 8:29 pm
 Malc wrote:
| Sundug wrote:
|
|| Thermosyphon action is driven by gravity, so the larger the height
|| difference between the warmer and cooler ends, the greater the
|| flow, everything else being equal. Gravity flow works better with
|| a large height difference, and low restriction to flow. Doug
|
| Now the problem I have is that you and Morris are sort of
| contradicting each other. And I can see the logic in what both of
| you have said.
|
| Hmmm <scratches head>

No contradiction that I can see.

It's very much about making good trade-offs. :-)

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Morris Dovey on July 19, 2007, 8:48 pm
 Morris Dovey wrote:
| Malc wrote:
|| Sundug wrote:
||
||| Thermosyphon action is driven by gravity, so the larger the height
||| difference between the warmer and cooler ends, the greater the
||| flow, everything else being equal. Gravity flow works better with
||| a large height difference, and low restriction to flow. Doug
||
|| Now the problem I have is that you and Morris are sort of
|| contradicting each other. And I can see the logic in what both of
|| you have said.
||
|| Hmmm <scratches head>
|
| No contradiction that I can see.
|
| It's very much about making good trade-offs. :-)

Afterthoughts:

Thermosyphon action /is/ driven by gravity - but the controlling
factors for flow are actually the air density differential in
combination with the aerodynamics of the plenum(s) within the panel.

If the panel were loss-free, the rate of flow wouldn't matter so long
as it wasn't zero, because 100% of the energy would eventually be made
available.

Given that there's no such thing as a loss-free panel, one needs to
note the nature of the losses (conduction, convection, re-radiation)
and work toward the solution that minimizes total loss without
violating constraints.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Morris Dovey on July 19, 2007, 9:01 pm
 Morris Dovey wrote:

| Thermosyphon action /is/ driven by gravity - but the controlling
| factors for flow are actually the air density differential in
| combination with the aerodynamics of the plenum(s) within the panel.

Hmm. I'm still stuck on air - let me re-phrase that to perhaps be a
bit more general:

Thermosyphon action /is/ driven by gravity - but the controlling
factors for flow are actually the collection media density
differential in combination with the flow dynamics of the passage(s)
within the panel.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



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