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gregkn73

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Hi, After a intense week at the begining of October, I finished my sunspace just in time. It is operational since 8/10, and because of it I have fire my fireplace only two overcast days. I am very satisfied with its operation T that can achieve, but since it was the first project of that magnitude I have completed myself, if I would make it again I will have constructed a lot different. I hope it will hold enough time... It is 3,5*1,7*3m height, twinwall polycarbonate 3,5*3m at 55 °, cetrifugal fan is 935m3/h 130W, the first operational day without bottom insulation achieved max 45°C, by the second day I placed insulation on the soil and bottom cement, and immediately nthe max achieving T increased to 53°C! The last 20 days external T on sunny days fluctuated from 7-20 to 3-15, max T was always after bottom insulation 52-54°C, and my sunspace was enough to keep 130m2 of my house at 20,5-22°C, without any additional heat supply. The last 5 winters I burned 7,5-10 Tones of wood, depending on the severity, if this winter I will burn around 5 tones, I will call it a definite success. I will give more reports as real winter will come. PS I tried to upload photos both with deckstop or mobile version , but didn't allow me. Very strange

gregkn73

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20171030151507.JPG  20171030151542.JPG

My "plenum". the laundry room in my basement, became also a giant drier, now i should sell the drier :-)) The heat from the basement move upsters through the sters. 
  

20171030151927.JPG

PS from the PC i can see the button insert photos, but from tablet or the phone this button can not be seen from mobile or decks top version!

stmbtwle

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Reply with quote  #3 
Nice job!

However you can see from the photo that a lot of light is being reflected back out of the sun space. You might hang "solar" screen or black cloth against the wall (landscape fabric is cheap), it will absorb more light/heat and transfer it to the air.  A good solar collector looks like a black hole from the outside.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gregkn73

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Wife strongly disagree with hanging landscape fabric, i hope later when real winter comes, i could change her opinion, but it will be too tough :-)

PS Willie when you refer to solar screen, is the mosquito net?
stmbtwle

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Reply with quote  #5 
This stuff: https://www.lowes.com/pd/Phifer-Super-Solar-Screen-Wire/3033651

You COULD simply paint the wall flat black, but I doubt she'd approve that either [frown]

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #6 
Wife strongly disagree with hanging landscape fabric, i hope later when real winter comes, i could change her opinion, but it will be too tough :-)

If you got to compromise, keep this chart handy.



Surface ColorAbsorb Factor - Fraction of Incident Radiation Absorbed
(approximated)
White smooth surfaces0.25 - 0.40
Grey to dark grey0.40 - 0.50
Green, red and brown0.50 - 0.70
Dark brown to blue0.70 - 0.80
Dark blue to black0.80 - 0.90

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Rick H Parker
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Electronics Engineering Technologist
gbwillson

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Reply with quote  #7 
Greg-

Looks great! Check Dan's sun space if you haven't already. I know he had some issues with condensation running down the inside of the glazing and freezing. 

As far as wall colors, you will never win, UNLESS...you can show her how much more cozy it will be with a dark wall. But the wall doesn't have to be black either. I guess I wouldn't want to spend much time in a room with black walls and floor. 

Do you have a way to keep the air from back flowing at night?

Greg in MN


stmbtwle

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Reply with quote  #8 
A nice "warm" shade of brown or burgundy or green might be more appealing... I would also paint the 2x6 framework.

Dark paint could be an issue in the summer... how about roll-up shades?  It would be simple enough to fasten your screen or shade cloth to round stock or 2x2s, and hang them on hooks.  In summer (or when she insists) you roll them up and store them. The screen comes in 4' widths which would be easy to work with.  

Then there's this stuff:  https://www.catalogclearance.com/90-Shade-Cloth-12x18

You can buy roll up solar shades ready made, but they're darned expensive.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gregkn73

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Reply with quote  #9 
Greg for back flow I have similar flaps to those https://www.google.gr/search?q=γρίλιες+εξαερισμού&client=tablet-unknown&prmd=imnv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwikvZie5ZvXAhUFLVAKHeu9B5oQ_AUIEigB&biw=600&bih=1024#imgdii=hOjCMRt_0V-N-M:&imgrc=WBt0FfC5gaZcEM:

I am not satisfied with them, because of the noice they produce by....flapping, when the fan is operating.

Willie I thought also about rolling up shade cloth, but I have the window, which I don't want to cover and complicate a little bit , the application.

What I didn't like so far.....sunspace is uninhabitable because of the very high T! Not only for human which I actually don't care since it is too small place, but I think also for the few plants I place to overwintering! As you can see from the photo, strelitzia is stressed, due to high T. And that was my main selling point , to built it to my wife :-( fortunately it seems to be very efficient producing usable heat for the house, so my wife hadn't complaint about it :-)

What I didn't expect, and it is very possitive is the transformation of the laundry room in a huge drier, with very cosy conditions during day, T is 25-26°C and humidity ≤50%, so my children move a lot of toys in there. New place for them to spent some time...
gbwillson

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Reply with quote  #10 
I know what you mean about the DIY back flow damper. I made mine out of cloth so it wasn't too bad. You could also look at one of the spring loaded ones like some of these:

https://www.google.gr/search?client=tablet-unknown&biw=2243&bih=1328&tbm=isch&sa=1&ei=kf_4WeCDNZC6jwTVl6_oBQ&q=hvac+backflow+damper&oq=hvac+backflow+damper&gs_l=psy-ab.3...39803.45551.0.46010.11.9.2.0.0.0.171.935.5j4.9.0....0...1.1.64.psy-ab..0.1.171...0i24k1.0.AfdsxEcs5TI

They also have a gasket to help create a better seal and make it a bit quieter upon shutting. I think they run about $25. 

You could also have roll ups on either side of the window. I agree that covering the window would not be a good choice.

As I mentioned earlier, Dan built a really nice sunspace and has a nice area to enjoy during our long Winters.

http://simplysolar.supporttopics.com/post/solar-dans-sunspace-6481871?highlight=sunspace&trail=10

Greg in MN
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