Jon G.

2017-01-31 10:41:21 UTC

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The idea is to make a Parabolic Trough with a pipe through the length of itsRaw Message

focus, to have sunlight heat liquid in the pipe.

http://stonetaberacle3.yolasite.com

In this particular development I wanted to be able to fully utilize the 48

inch width of a roll of reflective mylar to surface the trough. I

calculated the arc length of a 2-D slice of the parabola using Calculus. I

used the nested parabolas solution

http://www.stonetabernacle.com/NESTED_PARABOLAS3.html to account for 1/4

inch plywood to create the parabolic trough surface. I chose the focus of

the parabola at (0., 5 inches).

The resulting equation was complex, so I drew a graph of it and

qualitatively deduced where the curve intersected the abscissa, which was

the solution to the width at the top of the parabola, which resulted in 34

3/4 inches, well within the use of a 4' x 8' sheet of 3/4 inch thick plywood

to make the frame.

While there are infinite combinations that will work to construct a Solar

Parabolic Trough, I chose this one for depth, range and the availability of

materials. A flatter parabola doesn't have to be adjusted as much to face

the sun but suffers from lesser heat. A deeper parabola has to follow the

sun more closely but produces more concentrated heat.

There may be infinite combinations, but the equation remains the same for

all of them.

Jon G.

***@bellaire.tv

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