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matlocc

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Posts: 66
Reply with quote  #1 
I am getting closer to an applied science class in solar.  I am having trouble with sealing the glazing on so it is removable, so the kids can try ideas on the inside. 
I am thinking baffles on velcro for baffles.
I did get a good price on 100 ft of aluminum angle, so I thought wingnuts on the side or top,  to secure to the frame.  I am not sure how to do it so that it seals and is removable.

The panels need to be removable and portable for an hour a day (The moving part has to be easy.)


Also, anyone that would like to create a step by step worksheet for doing all of the calculations that would be AWESOME!
My thoughts are for topics: (7 weeks, 45 minutes a day)

1)solar radiation, absorbtion and reflection
2) re-radiation, what is it and how does it work? 
3) Temperature rise and surface area
4) Airflow vs surface area
5) Airflow and temperature rise.
6) What is a btu and how does it relate to this?
7) how do you find the optimum efficency, even when all the others are not the highest numbers?
In between learning that in the classroom, they will be out in the cold taking readings on the air flow ideas they have created in the panels.

What am I forgetting or what should I do different? Think about it as if YOU were teaching it to someone and they had a box already built for testing their ideas. They need to learn and not be told. whats right (or best)


stmbtwle

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Reply with quote  #2 
I'd use the aluminum angle to reinforce the glazing, and mount with "hanger bolts" and wing nuts.  The hanger bolts will screw into the wood frame, then the plastic and aluminum go on top with the wing nuts.  For seal use cheap foam weather stripping.

I'd glue the aluminum and weatherstrip to the glazing so it all comes off in one piece.  I thought of hinges but I think the cover would just get in the way when open.

https://www.homedepot.com/p/8-32-x-1-1-2-in-Plain-Hanger-Bolt-4-Piece-809291/204274980

Something like this? 
glazing.jpg

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

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Posts: 66
Reply with quote  #3 
Thanks, I was thinking along those lines except my box is polyiso with a wood frame around it.  I am not sure if the angle will be long enough to span the wood and polyiso.
stmbtwle

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Reply with quote  #4 
If the twinwall is large enough to cover the wood, 1" angle will be more than enough.  If you're planning on the twinwall fitting inside the wood frame, you'll need a different approach.  I'm having trouble visualizing what it is you have.

Possibly a wood "picture frame" that is wide enough to fasten to the wood frame. you can make it as wide as you need.

Or maybe you can use 1-1/2" angle. It gets expensive though.

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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  #5 
1) Forms of energy: Electromagnetic radiation, Thermal energy.
2) Absorption, Emissivity and Reflection.
3) Units of Energy, Units of Temperature, Units of power and the difference between the three.
4) Conversion of Electromagnetic radiation to Thermal energy.
5) Effects of Air flow and surface area on energy gain.


Forms of energy:
Solar radiation is electromagnetic energy. Electromagnetic energy is the energy of a wave. A wave does not need matter to transverse space.
Thermal energy is a form of kinetic energy, it is due to the motion of particles. Thermal  energy requires matter to transverse space.
Outer space is a vacuum it does not contain matter, a vacuum is the best thermal energy insulator there is. That is why the sun is millions of degrees hot, the vacuum of outer space is an insulator trapping the thermal energy of the sun to the location of the sun.
All energy from the sun from the sun transverses space in the form of electromagnetic radiation. This is why space blankets work very well in space but not on earth.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
matlocc

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Posts: 66
Reply with quote  #6 
When I build the next frame I am going to make the frame up closer to the twinwall.  My straps don't work well and I may have to router the edge if the thickness of the frame is to large for the l angle.

Attached Images
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jpeg 20171031_131140.jpg (133.42 KB, 28 views)

gbwillson

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Reply with quote  #7 
What if you made a simple frame out of wood, siliconed the frame to the glazing and used bungie cords(or straps) to hold the frame/glazing in place? The added frame would allow the glazing to seal while only being held down in a few places.

Greg in MN
Rick H Parker

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Reply with quote  #8 
What if you made a simple frame out of wood, siliconed the frame to the glazing and used bungie cords(or straps) to hold the frame/glazing in place?

Toggle latches would work better, last longer and cost less then bungee cords.

 



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #9 
If you have a table saw simply rip strips of wood to build up the existing frame to the level of the polyiso, secure with screws. Then you have something to fasten your "window frame" to.

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

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Posts: 66
Reply with quote  #10 
Ok guys! I am getting closer, I have temp probes and thermo switches donated.  THIS IS GONNA HAPPEN! I have 150 dollars and should be able to make 8- 2 by four foot boxes but I am not sure how to get 35 kids working on 8 boxes. (I will have the boxes pre-built)
I am making a vocab list:  what am I forgetting?
 radiation
conduction
convection
albedo
volume
surface area
density
delta T
thermal siphoning
thermo switch (bi metallic)
Fan
duct
dc circuit
sun angle
stagnation (which most students are good at!)
efficency
weathering
ANYTHING I NEED THAT I AM MISSING?
After this week so far in Michigan I am going to need something in the classroom for the cold, cloudy rainy days. (3 in a row so far and Scott's videos don't last that long! (50minutes)  So we can work in the classroom, I am thinking worksheets with problems in the above areas.  THIS IS A LOT OF WORK FOR A CLASS that hasn't happened yet, I will have a mix of all ability levels also.
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