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Research Papers

Parametric Trough Solar Collector With Commercial Evacuated Receiver: Performance Comparison at Plant Level

[+] Author and Article Information
Juan Pablo Núnez Bootello

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

Markus Schramm

Abengoa,
Calle Energía Solar, 1,
Seville 41014, Spain
e-mail: markus.schramm@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

Abengoa,
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 January 10, 2017; final manuscript received May 18, 2017; published online June 8, 2017. Assoc. Editor: Marc Röger.

J. Sol. Energy Eng 139(4), 041014 (Jun 08, 2017) (7 pages) Paper No: SOL-17-1016; doi: 10.1115/1.4036934 History: Received January 10, 2017; Revised May 18, 2017

A new anidolic parametric trough solar collector (PmTC) having 8.12 m net width aperture has been recently proposed for a commercial evacuated receiver tube with an absorber diameter of 70 mm. Since the collector was designed ignoring transmission, absorption, and reflection optical losses, calculations of the optical efficiency and the incidence angle modifier (IAM) by means of Monte Carlo spectral raytracing simulations using real slope errors distributions and taking into account Fresnel reflection losses were done. Comparison with an Eurotrough parabolic trough collector (PTC) shows an optical penalization of 5.1% due to the reflectivity and additional soiling of the secondary mirror, to an increase in the end losses and to the Fresnel reflection losses. The National Renewable Energy Laboratory (NREL) system advisor model (SAM) was used to perform annual simulations of two commercial 50 MWe oil power plants without thermal energy storage located in Seville. A PTC solar field consisting of 90 loops, each one having four Eurotrough solar collector assemblies (SCA) with 150 m length was first modeled resulting in a gross production of 386 kWh/(m2 yr). A PmTC solar field with the same module length and similar SCA net aperture area was also simulated. A final configuration of 94 loops and four SCAs with 100 m length per loop yields a gross production of 379 kWh/(m2 yr) showing no improvement compared to the reference PTC plant. The present study allows to advance in the understanding of the potential of the anidolic optic to produce optical geometries able to effectively improve the PTC technology in the short-term projecting results at a commercial plant level.

Copyright © 2017 by ASME
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References

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Figures

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Fig. 1

PmTC primary geometry with an external secondary concentrator detail and commercial 70-mm evacuated receiver

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Fig. 2

Fresnel reflection losses in a glass enclosed receiver combined with a second-stage concentrator optic [12]

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Fig. 3

PTC and PmTC distribution of registered incidence angles of the ray bundles to the glass envelope surface normal direction at collector incidence angle = 0 deg and collector tracking angle = 0 deg

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Fig. 4

PTC and PmTC distribution of registered incidence angles of the ray bundles to the absorber tube surface normal direction at collector incidence angle = 0 deg and collector tracking angle = 0 deg

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Fig. 5

PTC and PmTC distribution of registered incidence angles of the ray bundles to the glass envelope surface normal direction at collector incidence angle = 0 deg and collector tracking angle = −60 deg

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Fig. 6

PTC and PmTC distribution of registered incidence angles of the ray bundles to the absorber tube surface normal direction at collector incidence angle = 0 deg and collector tracking angle = −60 deg

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Fig. 7

PmTC IAM improvement related to the PTC IAM (in %)

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Fig. 8

Field arrangement with the solar field broken up into two header sections [15]

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Fig. 9

PTC SCA solar field configuration

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Fig. 10

A 1D heat balance for the commercial receiver with external secondary

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Fig. 11

Direct normal irradiation

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Fig. 12

PTC and PmTC optical efficiency

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Fig. 13

PTC and PmTC receiver thermal losses (MWh)

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Fig. 14

PTC and PmTC solar field flow rate (kg/h)

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Fig. 15

PTC and PmTC electric power output (MWh)

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