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re: correct shape for a stationary,vertical trough collector
25 apr 2001
derek hartzell wrote:
>what is the correct shape for a stationary, vertical trough collector?
how about a linear parabolic reflector, 8' deep and 8' tall, aimed at
the equator? you might cut 1/4" kerfs 2.5" deep in some 12' 2x4s and
bend them until they close. a 16" arm at right angles to the curvy end
can reduce the force required and reduce the max/min bending moment
ratio from 5.2 to 1.7. you might steam the bows or use galvanized
strapping to keep them bent.
nick
distance along 2x4
kerf x (feet) y (feet) (feet) (cm)
0 .02 .40 .428 13.03
1 .08 .82 .868 26.45
2 .19 1.2 1.33 40.70
3 .36 1.7 1.85 56.30
4 .61 2.2 2.43 74.00
5 .96 2.7 3.11 94.82
6 1.4 3.4 3.95 120.40
7 2.1 4.1 5.03 153.40
8 3.3 5.1 6.52 198.58
9 5.0 6.3 8.70 265.10
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