Cost-exergy optimisation of linear Fresnel reflectors

Philip Davies; Jonathan Nixon

doi:10.1016/j.solener.2011.09.024

Cost-exergy optimisation of linear Fresnel reflectors

Philip Davies, Jonathan Nixon

Research output: Contribution to journal › Article › peer-review

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/m2) 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 50 W/m2 and an additional 122 h 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

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in <Journal title>. 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 Davies, P & Nixon, J, 'Cost-exergy optimisation of linear Fresnel reflectors', Solar Energy, vol 86, no. 1 (2012) DOI http://dx.doi.org/10.1016/j.solener.2011.09.024

Keywords

solar thermal collector
linear Fresnel reflector (LFR)
linear Fresnel collector
exergy
CSP

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10.1016/j.solener.2011.09.024

Cost-exergy optimisation of linear Fresnel reflectors
NOTICE: this is the author’s version of a work that was accepted for publication in <Journal title>. 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 Davies, P & Nixon, J, 'Cost-exergy optimisation of linear Fresnel reflectors', Solar Energy, vol 86, no. 1 (2012) DOI http://dx.doi.org/10.1016/j.solener.2011.09.024
Accepted author manuscript, 173 KB

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/m2) 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 50 W/m2 and an additional 122 h 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 = "Philip Davies and Jonathan Nixon",

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Cost-exergy optimisation of linear Fresnel reflectors

Abstract

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Keywords

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