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stmbtwle

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Reply with quote  #11 
I'll bet you really got their attention!


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

KevinH

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Reply with quote  #12 
Nice pictures and good to see the kids interested in solar.  It's great you will be teaching them about airflow vs temperature rise and efficiency.  A common mistake (such as in some youtube videos) is looking only at the temperature.  It is temperature rise and airflow (measured, not assumed) that together determine performance.  Something else you could do is to change the angle of the collector to the sun and ask them why the temp rise changes.

Kevin H
MN
matlocc

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Reply with quote  #13 
They are trying to figure out today the best angle. (No sun!)  The tilt of the earth and latitude were the only 2 things I gave them and the rest is up to them. They are doing quite well with that, when I explained that the angle measurement was based on laying flat on the ground at the equator being zero.
It will be nice when it is a bit warmer. Should I have them work with duct work at all (trying to keep cost down still) I am waiting to get the angles and position , temp probe placement and such down and then we will start figuring surface area and cubic ft of air etc..  (I am having quite a bit of fun already!)
Rick H Parker

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Reply with quote  #14 
The link would only go to just facebook

Do it as Willie suggested, copy and paste the address from the address bar when your on your Facebook page. You be surprised what some of us can do with the tiniest scrap of information.

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Rick H Parker
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Electronics Engineering Technologist
gbwillson

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Reply with quote  #15 
You need to click on the little chain/link icon and paste the address for it to become an active link like this:

https://www.facebook.com/chuck.matlock.16
stmbtwle

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Reply with quote  #16 
Found it.  Wasn't what I was expecting, but congratulations!


While you still have snow, you could point out the difference the reflected light makes to the collector.

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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  #17 
The write up is not on his timeline. Most likely it is in a Facebook group. That is a different Facebook domain.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Gordy

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Reply with quote  #18 
matlocc,
Quote:

It will be nice when it is a bit warmer. Should I have them work with duct work at all (trying to keep cost down still)


Yes if you can. Others here can recommend a low cost anemometer to measure air speed, then calculate CFM's by the size of the duct. Test straight ridged ducts, ad elbows and test again. Test flexible ducts laid loose and stretched tight, then with bends. To see how each change effects air flow. Also test different diameters of ducts. All tests with the same fan as the bench mark. This is info needed in the planning stage to get the proper fan size.

I agree with what Willie said 
Quote:
While you still have snow, you could point out the difference the reflected light makes to the collector.


Place one on the snow and one on bare black top, a experimental reflector could be made form a cheap 1x2 wood frame and stretch a $2 or $3 Mylar emergency blanket (from sporting good  section at Wal-Mart) over the frame. To lay in front or the collector at different angles.



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Gordy,
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matlocc

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Reply with quote  #19 
Thanks I will now try to get some ducting. I only have computer fans at this point. I do have a fixkit anemometer, so we are good there.  Some of the kids already discovered the snow trick.
I put the short write in a post above. It wasn't much but it was only day one.
stmbtwle

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Reply with quote  #20 
I don't see much reason for duct work unless you want to build an Aretha Molinari. You're already halfway there.


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