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gbwillson

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Reply with quote  #11 
This may sound silly, but I was wondering what the effect would be if bubblers were placed at the bottom of the tank and introduced warmed air to the bottom of the tank. Imagine millions of bubbles filled with warmed air exploding as they rise to the surface. An air pump could be used to draw the air through the tank. This would also eliminate any temperature variations within the tank. While this idea didn't work in the bathtub when I was a kid, I think it could work here.  ;}
Greg in MN[wave]

SolarInterested

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Reply with quote  #12 
Quote:
Originally Posted by GaryBIS
... It would be fun to try the Shurcliff scheme and just see how well it works, but I don't see any straight forward way to make the cowl stirps?

The first thing I thought of when I saw their cross section was that it looked a lot like that of the aluminum collector fins especially those made with the vice-grip pinching tool. Couldn't collector fins be substituted? .. or longer versions of collector fins made with the same technique?

This gets complex very fast with fins, extra fans and insulated inclosures around steel tanks. Maybe simple is better with many small water filled bottles.

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Garage_Hermit

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Reply with quote  #13 

Here are a few alternatives for the heating channels...

In the case of PVC rainwater gutters, greater volume requires greater leakage, therefore I would sit the gutter on this stuff - say 5 mm diameter...
[2214]

G_H

 
Attached Files
pdf GH_channel_variants.pdf (770.09 KB, 11 views)


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GaryBIS

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Reply with quote  #14 
Hi SI,
I've got some extra fins around -- I'll see if I can alter them to do the cowls.  Seems like the airflow channel needs to be larger than the 5/8 inch dia of the fins.

Agree that if you are in a position to have a bunch of 2 liter polycaronate pop bottles in an enclosure where you can blow air over them so that they all get good airflow that its a simpler way.  

Each 2 liter pop bottle is worth about 1 sqft of surface area.
200 of them would be about 105 gallons and 200 sf of heat exchange area.  Quite a bit of heat exchange area even if the heat transfer coefficient is not as good as a radiator or the Shurcliff scheme.

GH -- great drawings!

Gary

Ky-Jeeper

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Reply with quote  #15 
I have two 8' baseboard hydronic elements similar to these, which may be mounted in the top of my collector???thCAFSAXYS.jpg 
Garage_Hermit

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Reply with quote  #16 

KY JEEPER,

That could be very interesting !  A hybrid collector !

Since they are outside, presumably the would be at risk of freezing, therefore would require a full-blown hydronic approach - antifreeze or drainback...

The nice thing about this appraoch is, they could be connected either to a TANK (since we are talking about "heat storage for solar air"...

OR

they could be directly coupled to other of their "cousins" located on your baseboard, for direct space heating...

G_H

 


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SolarInterested

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Reply with quote  #17 
Quote:
Originally Posted by GaryBIS
... I've got some extra fins around -- I'll see if I can alter them to do the cowls.  Seems like the airflow channel needs to be larger than the 5/8 inch dia of the fins.

Maybe a scaled down test with a metal 5 gallon pail?

Mike

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Both temperature rise and airflow are integral to comparing hot air collectors
mattie

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Reply with quote  #18 
Hello Solar Interested
I think thats a good idea.You could use styrofoam like Garage hermit suggested earlier to create an insulated enclosure.Any type of rigid foam based insulation that may be lying around would get the job done too.
Regards Mattie
Julian Jameson

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Reply with quote  #19 
Here's some interesting research. A PCM (phase change material) can be made by combining coffee grounds and stearic acid, two readily available low-cost items.


"Conclusion
A novel composite PCM was prepared within the coffee grounds (CG) as the novel support for PCM. The optimized percentage SA confined in the CG was found as 50 wt%. The SA/CG 
composite PCM was characterized by SEM and FT-IR spectroscopy techniques. The 
microstructure analysis proved that the stearic acid was dispersed in the porous network of CG. 
FTIR analysis improved the no chemical interaction between stearic acid and CG. It was 
concluded that the melting and freezing temperatures and latent heats of composites PCM were acceptable determined using DSC analysis. Thermal conductivity of the composite PCM was also increased by addition for Gr. Based on all results, it was concluded that the research concerning the coffee grounds as support material for the PCM has demonstrated the ability to tailor PCMs with acceptable thermal properties."

http://www.ummto.dz/IMG/pdf/Lamrous.pdf
Ky-Jeeper

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Reply with quote  #20 
I knew there was something about those coffee rounds. They help heat my compost pile up.
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