Tracking-refinement modeling for solar-collector control

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Description

A closed-loop sun-tracking control used in conjunction with an open-loop system can utilize the unique features of both methods to obtain an improved sun-tracking capability. The open-loop part of the system uses a computer with clock and ephemeris input to acquire the sun at startup, to provide alignment during cloud passage, and to give an approximate sun-tracking capability throughout the day. The closed-loop portion of the system refines this alignment in order to maximize the collected solar power. For a parabolic trough that utilizes a tube along its focal line to collect energy in a fluid, a resistance wire attached ... continued below

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Pages: 8

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Biggs, F. January 1, 1980.

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Description

A closed-loop sun-tracking control used in conjunction with an open-loop system can utilize the unique features of both methods to obtain an improved sun-tracking capability. The open-loop part of the system uses a computer with clock and ephemeris input to acquire the sun at startup, to provide alignment during cloud passage, and to give an approximate sun-tracking capability throughout the day. The closed-loop portion of the system refines this alignment in order to maximize the collected solar power. For a parabolic trough that utilizes a tube along its focal line to collect energy in a fluid, a resistance wire attached to the tube can provide the sensor for the closed-loop part of the control. This kind of tracking refinement helps to compensate for such time-dependent effects as sag of the absorber tube and deformation of the concentrator surface from gravity or wind loading, temperature gradients, and manufacturing tolerances. A model is developed to explain the behavior of a resistance wire which is wrapped around the absorber tube of a parabolic-trough concentrator and used as a sensor in a tracking-refinement control.

Physical Description

Pages: 8

Notes

Dep. NTIS, PC A02/MF A01.

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  • 26. international instrumentation symposium, Seattle, WA, USA, 5 May 1980

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  • Report No.: SAND-80-0585C
  • Report No.: CONF-800502-11
  • Grant Number: EY-76-C-04-0789
  • Office of Scientific & Technical Information Report Number: 5696126
  • Archival Resource Key: ark:/67531/metadc1093830

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 20, 2018, 7:48 p.m.

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Biggs, F. Tracking-refinement modeling for solar-collector control, article, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1093830/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.