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solarusmc

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Posts: 180
Reply with quote  #31 
working on the drawings now..
will post em soon.

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'

solarusmc

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Posts: 180
Reply with quote  #32 
I posted these picture links from my photo album here at SimplySolar so these can be seen there as well.

Picture 3 below shows a double pass collector design where as the Return air from house will come in from the back/bottom of collector.. travel UP then DOWN the backside of the absorber plate, hook around in FRONT of the absorber plate.. then run up and out the Supply hole into the house.

Both of the collectors below are of simple / easy to build designs. They can be as tall or horizontally WIDE as you want and both will stop 99% of any cold air backdrafts from coming back into your home/garage/man cave (with Beer) They can be built using double layered screen, single layered screen over flat sheet tin, flat aluminum sheet only, or whatever you want to incorporate for your absorber material.

[image]



[image]


This design in Pictue 3 is for those who do not want both Supply/Return holes high on the wall in their home/garage/man cave (with Expresso Martinis)
Only problem with the below design is you will 'still' have a little cold air in the return air routing chamber mounted to the back of the collector.
[image]
I mean I really LOVE this Picture 3 design however, by the time the hot air finally leaves the collector into the house it'll be so CONFUSED, it won't know WHERE to GO! Ha! [biggrin]

as far as air space behind and in front of the absorber plate.. a 6 inch metal stud frame would most likely have to be used during construction as to not restrict air flow.

Now where the air has to travel around the bottom of the absorber plate I'm thinking at least 8 to 12 inches of space would be needed for between the bottom edge of the absorber plate TO bottom inside of the collector.

The box mounted to the back of the collector used to route the return air UP to second return Hole would have to be insulated and some cold air would remain in that chamber at night so a damper would have to be installed in the Return tube to stop any cold air from dropping back into the house from the chamber. I'm sure the cold air in that chamber would be very minor.

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
solarusmc

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Posts: 180
Reply with quote  #33 
I like this design the best. Picture 3 below..

What would be cool is if you could route the upper Return tube straight thru into the wall of your house between the studs and use THAT as the chamber to route the Return Air back up to the TOP of the collector Return Hole.

That would eliminate the need to build a return air routing box on the back of the collector.

Your interior wall between the studs would become the return air routing chamber.

Just insulate the wall between the studs with 1/2 inch foam board insulation then pop a hole in the sheet rock down below for your register.

So looking at the picture below.. the box attached to the back of the collector with tube at bottom would be removed and your house wall would become the new chamber.

is everybody following me? [biggrin]
or clear as MuD? [confused] 
[image]



Check out the RED TEXT in the picture below to see how the interior wall of the house could be used to route the Return Air Flo thus eliminating the need to build a secondary Return Air Chamber on the back of the collector.

[image]

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
ggtaft

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Posts: 5
Reply with quote  #34 
Hi all

My design is a little different.  My air exchanger enters the box on the side instead of the back.  I think that it will save some pressure drop that way.  The drawing that I added to this post will show what I mean.Scan 3.jpg The first drawing is of the front side and the second is the back.  The rectangle on the bottom of the first drawing is a hole through the absorber to let the air go to the back side. 

I am thinking about using twin wall poly for the glazing and polyiso for the back and sides.  What thickn ess of polyiso should I use?  What works better pushing or pulling air through a collector or both or both using 2 fans?  Also, how much space between the glazing and absorber should I use?Any thoughts on this and how I could improve it would be appreciated.

ggtaft

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Posts: 5
Reply with quote  #35 
I forgot to mention I live in central MN and it is cold here already.
solarusmc

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Posts: 180
Reply with quote  #36 
GGTaft,

I understand the routing of the air from one side to the other however where does the cooler air from the house enter your collector and where does the hot air enter the house?

Like which opening is which?

Thanks!

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
ggtaft

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Posts: 5
Reply with quote  #37 
I will build a box that goes in the window with a board that connects to the absorber in the middle of the box then do some wood work to have one side of the box be the in and the other be the out.  I have a couple Pabst blower fans like the one listed but mine are A/C and use only 18 watts a piece so I could use 2 fans if I need to.  These blowers really move lots of air.

http://www.ebay.com/itm/like/161137420382?lpid=82





solarusmc

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Posts: 180
Reply with quote  #38 
Well, we'll all enjoy seeing your end product for sure.

Enjoy!

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Pat B. Warwick, Rhode Island Rest Assured! Comments and/or suggestions I make here at the forums on 'your' projects as well as my own have all been carefully and scientifically calculated by the 'seat of my pants'
Garage_Hermit

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Reply with quote  #39 
@ggtaft

Hi, I kind of liked your drawings at #36 above...

In particular, I liked the way you inadvertently borrowed my "crossover port" [redface]

I roughed out my design some months ago, it is still "under meditation" in my library.
FWIW, see enclosed pdf...
===========================

Otherwise, I guess you already saw items 14 thru 18 above, concerning the dual backpass ?
The referenced reserach paper is pretty involved, but I read it all (somehow...) and hopefully condensed some of the more important points...

Like, for example, the interesting one of using FINNING...

Just thought U might want to consider that aspect also, before U start building ? Could be a good opportunity to try out some theory !

In any case, Good Luck with the design !

P.S.
I am keen to see the backpass developed, as I reckon it offers a major advantage for anybody that has a metal wall to play around with (such as a barn with steel sidings) (the wall would -- per my design -- become the bulkhead...).  etc.

G_H

 
Attached Files
pdf Backpass_Solar_Collector--by--G_H.pdf (183.83 KB, 30 views)


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solardan1959

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Reply with quote  #40 
Though your not really an artist, I like the basic design.  I understand how the air is flowing both in and out But not sure what your going to do to get it in the house.  Would this be mounted on a wall or standing on it's own  90 degrees from the wall and the vent would go straight into the wall though a rectangular vent?  Otherwise if it's mounted on the wall it's going to have to turn/bend anyways so the vent's could come right from the back.

Here is a quick drawing of your collector with vents like I'm suggesting.  I'm thinking 2 inches on each side of the plate.

[image]

Dan
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