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Research Papers

Effective Absorber Area in Semispherical Solar Collectors With Spiral Cylindrical Absorber

[+] Author and Article Information
Carlos Armenta-Déu

Facultad de Ciencias Físicas,
Universidad Complutense de Madrid,
28040 Madrid, Spain
e-mail: cardeu@fis.ucm.es

Manuscript received November 14, 2018; final manuscript received May 20, 2019; published online June 11, 2019. Assoc. Editor: Ting Ma.

J. Sol. Energy Eng 141(6), 061010 (Jun 11, 2019) (6 pages) Paper No: SOL-18-1522; doi: 10.1115/1.4043857 History: Received November 14, 2018; Accepted May 20, 2019

This paper develops an advanced methodology to determine the real contribution of the incidence solar radiation components, direct, diffuse, and reflected, onto a semispherical solar collector with spirally rolled up cylindrical absorber, as a function of the intercepted area of the solar radiation components by the collector’s receiver. Based on a previous work (2012, Study and Characterization of New Generation Semispherical Thermal Collectors, Ana Sofía Morillo Candás, Applied Physics Master, Master Thesis, UCM) in which the effective intercepted area for direct radiation was modeled, the present paper develops new algorithms for diffuse and reflected solar radiation and improves the existing one, with the aim at characterizing geometrical parameters of these types of collectors. The determination of the effective area intercepted by the receiver for the different components of the solar radiation is essential for the characterization of the collector’s thermal performance, as the energy received by the absorber depends on the type of radiation and on the effective area covered by each type.

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References

Iqbal, M., 1983, An Introduction to Solar Radiation, Academic Press, Canada.
Bragado, L., 2012, “Optical Study and Characterization of the Solar Radiation Onto Spherical Solar Collectors,” Applied Physics Master, Renewable Energy Specialty, Master thesis.
Bubble Sun Co., Semispherical Solar Collector, Technical Guide. Trolley Logistia S.L. – RETEX. Av. Tecnología 35, 08840 Viladecans, Barcelona (Spain).
Armenta-Déu, C., and Lukac, B., 1990, Incidence Angle Modifier, Its Incidence on Solar Collector Utilizability and on Energy Received, Project EUFRAT, Final Scientific Report, Solar Energy Research and Development in the European Community, Solar Radiation Data.
Armenta-Déu, C., and Lukac, B., 1991, “A Correlation Model to Compute the Incidence Angle Modifier and to Estimate its Effect on Collectible Solar Radiation,” Renew. Energy, 1(5/6), pp. 803–809. Technical Note.
Duffie, J. A., and Beckman, W. A., 2006, Solar Engineering of Thermal Processes, 3rd ed., John Wiley and Sons Inc., New York .
Candás, A. S. M., 2012, “Study and Characterization of New Generation Semispherical Thermal Collectors,” Applied Physics Master, Master thesis, UCM.
Varela, R., 2013, “Development and Analysis of Characteristic Parameters for the Evaluation of Thermal Behavior of Semispherical Solar Collectors,” Applied Physics Master, Renewable Energy Specialty, Master thesis.

Figures

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Fig. 1

Semispherical solar collector with discontinuous absorber area

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Fig. 2

Graphical representation of the absorber area for a spherical solar collector divided in stripes

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Fig. 3

Schematic representation of the absorber

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Fig. 4

Geometrical approximation of the absorber section

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Fig. 5

Absorber frontal cross-sectional distribution

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Fig. 6

Stripe section shadowing

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Fig. 7

Covering factor of the absorber area versus angle of incidence for direct solar radiation

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Fig. 8

Graphical representation of the shadowed area by diffuse radiation

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Fig. 9

Graphical representation of the intercepted area for inner reflected radiation

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Fig. 10

Intercepted area evolution for inner reflected solar radiation

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Fig. 11

Graphical representation of the intercepted area (albedo)

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Fig. 12

Schematic representation of the interception of ground-reflected radiation

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Fig. 13

Intercepted area evolution for ground-reflected solar radiation

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