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gbwillson

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Reply with quote  #11 
Cloudy days are par for this time of year. Nice thing is the coldest days are normally the sunniest!

Static pressure
Laminar flow
R-Value
Off-gas
Transmittance
Emissivity
Reflectivity
Heat transfer
BTU's
ROI-Return on Investment
SAH-Solar Air Heater


I'm sure there are a many, many more words that could be defined in a glossary, but not all of them are used regularly. You could certainly fill time on a cloudy day by talking about the different types of heaters and what makes each one different. And of course you could show example photos and drawings of the different types of heaters.


Greg in MN




Rick H Parker

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Reply with quote  #12 
I still think the fundamentals I listed in #5 would be a solid base. Most of the problems we have with helping people is that they don't know the fundamentals.
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Rick H Parker
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matlocc

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Reply with quote  #13 
Well I have 8 test boxes built.  I have at least 3 weeks of handouts and worksheets and heat experiments that do not use the boxes. I solved my glazing problem with felt weather stripping and screen clips. 20171208_144914.jpg  20171208_144919.jpg  20171208_144924.jpg 
Gordy

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Reply with quote  #14 
Looks good to me ;-)
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Gordy,
Minnesota
gbwillson

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Reply with quote  #15 
Make sure you remove the protective plastic front and back from the glazing. I've made that mistake...only once. Screen clips. It might be a good idea to seal the ends of the twinwall with silicone or foil tape. Otherwise you will end up with critters making a home within the glazing. Screen clips are a nice idea for securing the glazing.

Greg in MN

stmbtwle

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Reply with quote  #16 
Also write "this side out" on the coated side. Once the plastic film is off you can't tell which side is which.
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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gbwillson

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Reply with quote  #17 
A Sharpie fades rather quickly in the sunshine. Etch a mark in the upper corner of the UV protected side. But you may still want a bolder marking so the students easily know which end should face the sun. We wouldn't want to strain the young brains full of mush trying to figure out which side is up.[wink]

Greg in MN
pianoman8020

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Reply with quote  #18 
Your plastic screen clips will not last too long (one season). The zinc ones will not degrade in the sun. UV degrading would be another subject to discuss. Hmmm, too much physics.

Jim from IL
matlocc

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Reply with quote  #19 
Which side is the outside on the twinwall?  Also these are only going to be take out for an hour a day during class for testing. The class meets at solar noon which is cool.  I was gonna use sharpie on the glazing and the boxes themselves so they fir together and had this side up, box 2, box 3 3tc...
gbwillson

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Reply with quote  #20 
The side with the writing, or label on the protective plastic wrap is the UV protected side. A sharpie WILL fade over the Summer, so you might be okay as long as you check the marking and refresh it as needed. But it will fade. 

Greg in MN
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