Re: heat value in each color in sunlight - science demo doesn't workwell

Dan Spisak wrote:
>

> Based on your description I assume that the "back" of the box faces the window and the box
> is located inside a room.

yes. This is how it will be in the classroom

> A few suggestions:
> - Use individual boxes. This will minimize the transfer of heat between the boxes.

there's 1/2" of styrofoam between each box, with silicon glue sealing the
various
components (wall, back, plexiglass) to there's no transfer of hot air between
the boxes (well I hope so anyhow - maybe I'd better check - I should try it with
one box in the sun and another in the shade).

> - Paper is a decent insulator. Use thin copper or aluminum as the back. Paint a thin
> layer of the appropriate color on the side facing the sun.

I may have to go for this if I can't supress the temperature rise in all boxes.

> - Mount the thermometer securely to the back. Use a heat transfer paste.

OK

> - Locate the boxes outside as the window glass will attenuate certain wavelengths of light.

only UV though? It's certainly letting in the IR. I can feel the
heat standing in the sun.

> This looks like a fun experiment. good Luck!

Thanks.

The experiment sounds simple enough in principle, but
finding a way of implementing it that would show what
I wanted, but using only simple components (so that
it would be easy to understand) has turned out to be
harder than I expected. Showing simple principles
isn't as easy as I'd thought.

Joe

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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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