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kzz1king

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Posts: 7
Reply with quote  #11 
I have (had) a DS on my garage roof for 2 years and cut my propane consumption by at least 50%. It was 3 DS's running 24 feet and then into a plenum and returning 24 feet. I was using insulated 6" flex to move air from the collector to the garage.  I was so impressed I added and additional 12 foot so now I have a 3 DS running 36 feet to the plenum and 36 feet back. The addon was easy because I built the collector in 2 section so just had to add a center section to expand. I also put in straight walled 6" ducting and insulated with thermax insulation to replace the flex.

The results thus far is that the cfm is much higher. I have a thin plastic back-draft gate that stands straight out now that used to flop around at about 1/2 open.  My output rise also increased from a 10-13 degree rise to a 20 degree rise currently. DS may not be the most efficient but it does work great and I like the clean look it provides,
Wayne

Scott Davis

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Posts: 697
Reply with quote  #12 
Thanks for the report Wayne!  Please feel free to take some pictures and detail your project in the Member Projects section!
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solardan1959

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Reply with quote  #13 
kzz1king,
   Like Scott said photos and details would be nice but it sounds like a successful project.  The one thing that caught my attention was the increase in cfm.  I assumed you were in a horizontal configuration and you never mentioned a fan.  Are you not using a fan so the higher temps are creating more air to heat up and rise so more force/cfm is created? or do you have a fan which means more length and more resistance so then the more cfm does not make sense.
Dan
kzz1king

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Posts: 7
Reply with quote  #14 
Solardan,  the increase came from the removal of the flex ducting and replacing with straight walled ducting. I use 2 squirrel cage blowers inline switched by an aquarium thermostat that is wired ijnto a contactor.
Wayne
rodamefo

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Posts: 1
Reply with quote  #15 
Hi Scott,
Going to build this for the upcoming winter, do you think placing coiled steel wire inside the downspouts would get higher temps?  

have a nice day,
Rodrigo
Scott Davis

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Reply with quote  #16 
Hi Rodrigo,

I would not recommend placing anything inside the downspout.  While more testing is needed, what folks have tried so far has inhibited airflow more than helped with additional heat transfer.

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Silverback

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Posts: 174
Reply with quote  #17 
Scott - I'd recommend taking posts 17+ and placing them under "Hot Air Tube Inserts". Thanks
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Silverback CT
Scott Davis

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Reply with quote  #18 
Where is the "Hot Air Tube Inserts topic?  I'm not finding it.
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gbwillson

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Reply with quote  #19 
I think he wants you to create one and move/copy posts over to the new topic.

Greg
Laurence

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Posts: 18
Reply with quote  #20 
Would some of the experienced 'down spout' panel builders please provide a materials and sources list?  Neither Home Depot or Lowes carries the Super Tuff-R insulation board nor in-line vent fans. 

I can't wait to get started on a fairly large downspout collector on my south veranda wall and just below the eight windows presently there.  Between the veranda and my 'main house' is a 30' wide by 8' high by 18" thick adobe wall which should make an excellent heat retainer.  In addition to that, all the interior walls of my house are of the same construction.  All-in-all the house is pretty energy efficient for its size but I do believe I could do a lot better.  BTW, there is a large kiva fireplace on the living room side of the aforementioned adobe wall which will accommodate four foot logs so the 'tonnage' of the combined wall and fireplace is considerable.

Thanks,

Laurence
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