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SolarInterested

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Reply with quote  #1 
http://www.builditsolarblog.com/2015/01/large-diy-serpentine-drainback-solar.html

From the Build-It-Solar site

"The system also uses a unique heat storage tank design that is partitioned into a warmer and a cooler section.  The collector circuit pulls water from the cold side of the tank and returns it to the warm side, and the radiant floor circuit pulls water from the warm side of the tank and returns it to the cooler side.  The idea is to allow the collector to run cooler, and therefore more efficiently."

[SerpPartitionedTank] 
The partitioned solar heat storage tank under construction.

It uses a U-tube (siphon?) to keep the water level equal between the two sides


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stmbtwle

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Reply with quote  #2 
Looks great to me. What do you estimate the capacity will be?
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Willie, Tampa Bay
SolarInterested

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Reply with quote  #3 
Not my system and it's not specified in the pdf file on the BIS page. I wonder if you could accomplish the same thing by taking the hot water for the radiant heating from the top of the tank and returning the cool water via a dip tube to the bottom.
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Both temperature rise and airflow are integral to comparing hot air collectors
stmbtwle

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Reply with quote  #4 
It might. I've seen several similar approaches some using plastic drums. I think it's an attempt at artificial stratification. How well it works I don't know.

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mattie

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Reply with quote  #5 
Thanks for the dip tube tip SolarInterested
The PDF here is really useful regarding tank shape and improving stratification linked to the tanks aspect ratio.
http://www.simplysolar.supporttopics.com/post/importance-of-tank-aspect-ratio-on-stratification-6898208?trail=50

Regards Mattie
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