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Solar Tracking Method Using Bimetallic Strips or Coils

IP.com Disclosure Number: IPCOM000050324D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Whedon, WT: AUTHOR

Abstract

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.

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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...