Research Papers

Optical Analysis of a Two Stage XX Simultaneous Multiple Surface Concentrator for Parametric Trough Primary and Flat Absorber With Application in Direct Steam Generation Solar Thermal Plants

[+] Author and Article Information
Juan Pablo Núnez Bootello

Calle Energía Solar, 1,
Seville 41014, Spain
e-mail: jp.nunez@abengoa.com

Henry Price

1250 Simms Street,
Lakewood, CO 80401
e-mail: hank.price@abengoa.com

Manuel Silva Pérez

Group of Thermodynamics and
Renewable Energy,
Department of Energy Engineering,
University of Seville,
Seville 41004, Spain
e-mail: msilva@us.es

Manuel Doblaré Castellano

Calle Energía Solar, 1,
Seville 41014, Spain
e-mail: manuel.doblare@abengoa.com

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received July 11, 2015; final manuscript received November 29, 2015; published online January 11, 2016. Assoc. Editor: Mary Jane Hale.

J. Sol. Energy Eng 138(2), 021002 (Jan 11, 2016) (6 pages) Paper No: SOL-15-1213; doi: 10.1115/1.4032243 History: Received July 11, 2015; Revised November 29, 2015

Today most commercial parabolic trough collector (PTC) solar power plants make use of the well-known LS3/Eurotrough optics. The PTC has a concentration ratio relative to the maximum thermodynamic limit equal to 0.31. In order to improve the competiveness of PTC technology, two well differentiated R&D strategies have been undertaken: (i) developing larger parabolic troughs, which places a higher demand in tracking accuracy and lower tolerances with respect to wind loads, quality of mirrors, control and assembly imprecisions, and (ii) developing secondary concentrators with the aim of bringing the concentration ratio relative to the maximum one as close to 1 as possible. In this paper, a parametric trough collector (PmTC) for a flat receiver designed with the simultaneous multiple surface (SMS) method is proposed. The method assumes zero transmission, absorption, and reflection optical losses and allows for both reflective primary and secondary surfaces (XX-reflective plus reflective) to be simultaneously designed, guaranteeing Etendue matching. The proposed PmTC geometry increases the referred ratio up to 0.59 with a rim angle greater than 100 deg and with the same effective acceptance angle as the PTC. The flat absorber can be replaced with a multitube receiver for application in direct steam generation (DSG).

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Fig. 1

PTC geometry for circular absorber

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Fig. 2

PTC geometry for flat absorber

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Fig. 3

A parabolic primary and a CEC secondary for flat receiver [14]

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Fig. 4

Second stage concentrator with two asymmetric CPCs on each side, for total rim angle of 90 deg [14,15]

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Fig. 5

XX SMS optics for circular receiver [19]

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Fig. 6

Calculating the first portion of the primary [14]

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Fig. 7

SMS chains for calculating the shape of optical surfaces[14]

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Fig. 8

XX SMS optics for flat absorber

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Fig. 9

Angle transmission curve comparison

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Fig. 10

Proposal of a multitube receiver



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