Second-law efficiency of solar-thermal cavity receivers

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Properly quantified performance of a solar-thermal cavity receiver must not only account for the energy gains and losses as dictated by the First Law of thermodynamics, but it must also account for the quality of that energy. However, energy quality can only be determined from the Second Law. In this paper an equation for the Second-Law efficiency of a cavity receiver is derived from the definition of available energy or availability (occassionally called exergy), which is a thermodynamic property that measures the maximum amount of work obtainable when a system is allowed to come into unrestrained equilibrium with the surrounding ... continued below

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Pages: 59

Creation Information

Moynihan, P. I. October 1, 1983.

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Description

Properly quantified performance of a solar-thermal cavity receiver must not only account for the energy gains and losses as dictated by the First Law of thermodynamics, but it must also account for the quality of that energy. However, energy quality can only be determined from the Second Law. In this paper an equation for the Second-Law efficiency of a cavity receiver is derived from the definition of available energy or availability (occassionally called exergy), which is a thermodynamic property that measures the maximum amount of work obtainable when a system is allowed to come into unrestrained equilibrium with the surrounding environment. The fundamental concepts of the entropy and availability of radiation are explored from which a convenient relationship among the reflected cone half angle, the insolation, and the concentrator geometric characteristics is developed as part of the derivation of the Second-Law efficiency. A comparison is made between First- and Second-Law efficiencies around an example of data collected from two receivers that were designed for different purposes. The author attempts to demonstrate that a Second-Law approach to quantifying the performance of a solar-thermal cavity receiver lends greater insight into the total performance than does the conventional First-Law method.

Physical Description

Pages: 59

Notes

NTIS, PC A04/MF A01; 1.

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  • Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted

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  • Other: DE84008508
  • Report No.: DOE/JPL-1060-65
  • Grant Number: AM04-80AL13137
  • DOI: 10.2172/5061762 | External Link
  • Office of Scientific & Technical Information Report Number: 5061762
  • Archival Resource Key: ark:/67531/metadc1054107

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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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Creation Date

  • October 1, 1983

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 29, 2018, 12:16 p.m.

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Moynihan, P. I. Second-law efficiency of solar-thermal cavity receivers, report, October 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc1054107/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.