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This article discloses a solar tracking method using bimetallic strips or coils, composed of two bonded metals having dissimilar coefficients of thermal expansion, as drive elements for the system.
English (United States)
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Solar Tracking Method Using Bimetallic Strips or Coils
This article discloses a solar tracking method using bimetallic strips or coils,
composed of two bonded metals having dissimilar coefficients of thermal
expansion, as drive elements for the system.
A low-mass direct-drive is illustrated in the figure. A driven device A, e.g., a
parabolic collector, is connected to a pivotable drive arm B, which is link
connected to a pair of pivoted drive levers Cl and C2. The drive levers C1 and
C2 are connected via drive links D1 and D2 to a pair of bimetallic strips E1 and
E2, which are fixedly connected to a pair of equalizing shades F1 and F2,
respectively. Positioned above the strip E1 is a mirror G1 for initial orientation
control of the driven device, and above the strip E2 is an equalizing shield and
reorientation mirror G2.
At sunrise, orientation mirror Gl directs sunlight onto left strip E1, warming it
and causing flexure upward and, via link D1, a counter-clock rotation of drive
lever C1. The rotation of the lever C1 operates via a link connection to cause the
drive arm B and driven device A to rotate counterclockwise toward the rising sun.
Right strip E2 and its links and drive lever C2, being in downward flexure due to
overnight cooling, assists this motion until sunlight strikes strip E2, warming it
and bringing the system into equilibrium. Due to the positioning of the shades F,
this tracking motion will continue until sunset, at which time strips E will both...