SCRAM: a fast computational model for the optical performance of point fucus solar central receiver systems

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Because of the complexities of heliostat shadowing and blocking calculations, computational models for the optical performance of point focus central receiver (PFCR) systems tend to be too slow for many important applications, such as optimization studies based on performance with realistic weather data. In this paper, a mathematical approximation procedure, designated Sandia Central Receiver Approximation Model (SCRAM) will be described. Rather than simulating the system components from first principles, it relies on data generated by the DELSOL code of Dellin and Fish for the optical performance of PFCR systems, and abstracts a mathematical model using a stepwise regression procedure. The ... continued below

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Pages: 41

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Bergeron, K. D. & Chiang, C. J. April 1, 1980.

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Description

Because of the complexities of heliostat shadowing and blocking calculations, computational models for the optical performance of point focus central receiver (PFCR) systems tend to be too slow for many important applications, such as optimization studies based on performance with realistic weather data. In this paper, a mathematical approximation procedure, designated Sandia Central Receiver Approximation Model (SCRAM) will be described. Rather than simulating the system components from first principles, it relies on data generated by the DELSOL code of Dellin and Fish for the optical performance of PFCR systems, and abstracts a mathematical model using a stepwise regression procedure. The result is a computational procedure which allows the user to define the heliostat field boundaries and tower height arbitrarily, generating a model for optical field performance, including shadowing, blocking, cosine, losses, and atmospheric attenuation, and which requires only a polynomial evaluation for each set of sun angles. A comparison with DELSOL for three different fields on three representative days indicates that the rms error of the approximation is 1-3% and that the new code is 1,000-3,000 times as fast as DELSOL. It is also shown that one reason that the accuracy in field performance predictions is higher than that of the generting function for the model is that much of the error in the generating function is due to an oscillatory behavior associated with a moire pattern in the optical response of the heiostat field.

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Pages: 41

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NTIS, PC A03/MF A01.

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  • Report No.: SAND-80-0433
  • Grant Number: AC04-76DP00789
  • DOI: 10.2172/5304143 | External Link
  • Office of Scientific & Technical Information Report Number: 5304143
  • Archival Resource Key: ark:/67531/metadc1065218

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

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  • April 1, 1980

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 30, 2018, 12:19 p.m.

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Bergeron, K. D. & Chiang, C. J. SCRAM: a fast computational model for the optical performance of point fucus solar central receiver systems, report, April 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1065218/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.