Cost-exergy optimisation of linear Fresnel reflectors

J. D. Nixon; P. A. Davies

doi:10.1016/j.solener.2011.09.024

Cost-exergy optimisation of linear Fresnel reflectors

J. D. Nixon, P. A. Davies

Aston University

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65 Citations (Scopus)

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Abstract

This paper presents a new method for the optimisation of the mirror element spacing arrangement and operating temperature of linear Fresnel reflectors (LFR). The specific objective is to maximise available power output (i.e. exergy) and operational hours whilst minimising cost. The method is described in detail and compared to an existing design method prominent in the literature. Results are given in terms of the exergy per total mirror area (W/m ²) and cost per exergy (US $/W). The new method is applied principally to the optimisation of an LFR in Gujarat, India, for which cost data have been gathered. It is recommended to use a spacing arrangement such that the onset of shadowing among mirror elements occurs at a transversal angle of 45°. This results in a cost per exergy of 2.3$/W. Compared to the existing design approach, the exergy averaged over the year is increased by 9% to 50W/m ² and an additional 122h of operation per year are predicted. The ideal operating temperature at the surface of the absorber tubes is found to be 300°C. It is concluded that the new method is an improvement over existing techniques and a significant tool for any future design work on LFR systems.

Original language	English
Pages (from-to)	147-156
Number of pages	10
Journal	Solar Energy
Volume	86
Issue number	1
Early online date	19 Oct 2011
DOIs	https://doi.org/10.1016/j.solener.2011.09.024
Publication status	Published - Jan 2012
Externally published	Yes

Bibliographical note

Publisher Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [86, 1, (2012)] DOI: 10.1016/j.solener.2011.09.024

http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

CSP
Exergy
Linear Fresnel collector (LFC)
Linear Fresnel reflector (LFR)
Solar thermal collector

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Materials Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.solener.2011.09.024

Post-PrintAccepted author manuscript, 917 KBLicence: CC BY-NC-ND

Cite this

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title = "Cost-exergy optimisation of linear Fresnel reflectors",

abstract = "This paper presents a new method for the optimisation of the mirror element spacing arrangement and operating temperature of linear Fresnel reflectors (LFR). The specific objective is to maximise available power output (i.e. exergy) and operational hours whilst minimising cost. The method is described in detail and compared to an existing design method prominent in the literature. Results are given in terms of the exergy per total mirror area (W/m 2) and cost per exergy (US $/W). The new method is applied principally to the optimisation of an LFR in Gujarat, India, for which cost data have been gathered. It is recommended to use a spacing arrangement such that the onset of shadowing among mirror elements occurs at a transversal angle of 45°. This results in a cost per exergy of 2.3$/W. Compared to the existing design approach, the exergy averaged over the year is increased by 9% to 50W/m 2 and an additional 122h of operation per year are predicted. The ideal operating temperature at the surface of the absorber tubes is found to be 300°C. It is concluded that the new method is an improvement over existing techniques and a significant tool for any future design work on LFR systems.",

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author = "Nixon, {J. D.} and Davies, {P. A.}",

note = "Publisher Statement: NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [86, 1, (2012)] DOI: 10.1016/j.solener.2011.09.024 http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

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AU - Davies, P. A.

N1 - Publisher Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy, [86, 1, (2012)] DOI: 10.1016/j.solener.2011.09.024 http://creativecommons.org/licenses/by-nc-nd/4.0/

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N2 - This paper presents a new method for the optimisation of the mirror element spacing arrangement and operating temperature of linear Fresnel reflectors (LFR). The specific objective is to maximise available power output (i.e. exergy) and operational hours whilst minimising cost. The method is described in detail and compared to an existing design method prominent in the literature. Results are given in terms of the exergy per total mirror area (W/m 2) and cost per exergy (US $/W). The new method is applied principally to the optimisation of an LFR in Gujarat, India, for which cost data have been gathered. It is recommended to use a spacing arrangement such that the onset of shadowing among mirror elements occurs at a transversal angle of 45°. This results in a cost per exergy of 2.3$/W. Compared to the existing design approach, the exergy averaged over the year is increased by 9% to 50W/m 2 and an additional 122h of operation per year are predicted. The ideal operating temperature at the surface of the absorber tubes is found to be 300°C. It is concluded that the new method is an improvement over existing techniques and a significant tool for any future design work on LFR systems.

AB - This paper presents a new method for the optimisation of the mirror element spacing arrangement and operating temperature of linear Fresnel reflectors (LFR). The specific objective is to maximise available power output (i.e. exergy) and operational hours whilst minimising cost. The method is described in detail and compared to an existing design method prominent in the literature. Results are given in terms of the exergy per total mirror area (W/m 2) and cost per exergy (US $/W). The new method is applied principally to the optimisation of an LFR in Gujarat, India, for which cost data have been gathered. It is recommended to use a spacing arrangement such that the onset of shadowing among mirror elements occurs at a transversal angle of 45°. This results in a cost per exergy of 2.3$/W. Compared to the existing design approach, the exergy averaged over the year is increased by 9% to 50W/m 2 and an additional 122h of operation per year are predicted. The ideal operating temperature at the surface of the absorber tubes is found to be 300°C. It is concluded that the new method is an improvement over existing techniques and a significant tool for any future design work on LFR systems.

KW - CSP

KW - Exergy

KW - Linear Fresnel collector (LFC)

KW - Linear Fresnel reflector (LFR)

KW - Solar thermal collector

U2 - 10.1016/j.solener.2011.09.024

DO - 10.1016/j.solener.2011.09.024

M3 - Article

AN - SCOPUS:84855201572

SN - 0038-092X

VL - 86

SP - 147

EP - 156

JO - Solar Energy

JF - Solar Energy

IS - 1

ER -

Cost-exergy optimisation of linear Fresnel reflectors

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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