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matlocc

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Reply with quote  #11 
Thanks guys. These are students of mine and not very good at using the internet for more than playing games.  They did build a box panel, with 2 fans, glass top.  I could not get them to look at any of the sites. They had their idea and that was it.
They made a maze and then glued rocks painted black to the bottom.  The temps were not good but they got excited when it finally went over 100!
Input 80 and output 110.  It was a copy paper box and was really too deep.  This is a new class called applied scieence and I am just trying to get ideas that the kids can work on in 7 weeks and hour a day.

Chuck

gbwillson

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Reply with quote  #12 
Thanks for sharing the results Chuck.

Perhaps the kids could be divided into groups that are competing against each other similar to the national solar vehicle competition. You could have different categories such as maximum DeltaT, highest BTU output, lowest cost per BTU, and using only re-tasked or recycled materials, etc. I know it's not a video game, but the competition might be enough to hold their interest, especially seeing how they got excited seeing how they got excited with the results of their box panel.

Or maybe have them build their collectors and post weekly pics and updates here on SS. I'm sure we could start a forum category for the kids. How old are these "kids"?

Greg in Minnesota



matlocc

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Reply with quote  #13 
Greg, they are 13 and 14. 8th grade so they know everything!  (and they are cool)  I actually had the following projects all going on at once the first seven weeks.  solar heaters, solar ovens, making perfume, making makeup, building shoes, figuring out why 8lbs  is the proper amount of air in a basketball, genetic modified foods, soap making, energy efficient fans and primitive fire making.  I may steer more of them toward solar for the next seven weeks.  We get new groups of kids every seven weeks so this is a class that is evolving and keeping me on my toes.

Chuck
SolarInterested

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Reply with quote  #14 
Quote:
Originally Posted by gbwillson
Thanks for sharing the results Chuck.

and from me too. It's rare and nice to have a follow up to these types of requests.

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Both temperature rise and airflow are integral to comparing hot air collectors
stmbtwle

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Reply with quote  #15 
Yes thanks for sharing!

Sounds like you're having as much fun as they are!

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Willie, Tampa Bay
matlocc

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Posts: 52
Reply with quote  #16 
If I was going to make testing boxes for kids to use for hot air, what size and  construction materials can I use. I have no budget but I want to make lego style boxes so that the kids can change up ideas easily for testing.
Help!  fan power is an issue unless I only have 8 boxes.
Rick H Parker

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Reply with quote  #17 
what size and  construction materials can I use.

I would think, small demo or proof of concept size would be the best fit for educational purpose. It not like you have the resource or the space to do full size. A screen collector has the simplest construction and the lowest cost. As for aspect ratios, that is something those that experiment in solar thermal are always trying to work out.

You might want to settle on the type of solar collector first.


A modular system for the case ... that is a challenge.

Fan power is an issue unless I only have 8 boxes.

You mean the electrical power to run them or not enough fans to do more than eight?




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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
matlocc

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Posts: 52
Reply with quote  #18 
my thought is  2fooot by 4foot box made of polyiso. Then put velcro sheeting on the inside,then some polyiso pieces with velcro on the sides so they can be repositioned as walls inside.  In what ever way the students see fit.
I am not sure how to position the fans in the box, possible air input at the bottom on the side and out on the top side.  Possible twinwall polycarbonate glazing that has velcro to attach to the top, so it is removeable to change wall positions.  Also a screen frame so the students can try that.  Also a velcro computer fan that can be moved from top to bottom vents.  i think I can build a classroom set for about 200/250 dollars.  The 12 volt power supply for fans could be an issue.
These are just thoughts, any help is appreciated.
Rick H Parker

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Reply with quote  #19 

The 12 volt power supply for fans could be an issue.

Start going through the boxes of wall warts at the thrift stores. Send a note out to the parents, there are lots of 12V wall warts collecting dust. Your need to make sure the current rating of the wall warts are equal to or greater then the current of the fan(s) it is going to power. Since 2011 some of the desktop computer manufacturers have started using 12V only power supplies (the 5 V and 3.3 V conversion is done on the motherboard). You might be able to acquire some used ones cheap.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
matlocc

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Reply with quote  #20 
Thanks never thought of that.  It looks like I will have to write a grant to obtain the materials for the boxes.  
Here is my materials list. (what am I forgetting?)
steel studs (for frames)
2 x 12 glazing
sheet metal ( I plan on placing it on the back inside, so that the kids can attach barriers with magnets)
polyiso sheets for the sides and bottom
4 inch collars (2 per box)
4 inch insulated duct
liquid nails to glue foam
100 magnets (rare earth) to attach to barriers
10 computer fans

I plan on building 10 boxes. Any tips?
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