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Research Papers

Construction and Experimental Study of an Elevation Linear Fresnel Reflector

[+] Author and Article Information
J. D. Nixon

Sustainable Environment Research Group,
School of Engineering and Applied Science,
Aston University,
Aston Triangle,
Birmingham B4 7ET, UK
e-mail: j.nixon@kingston.ac.uk

P. A. Davies

Sustainable Environment Research Group,
School of Engineering and Applied Science,
Aston University,
Aston Triangle,
Birmingham B4 7ET, UK
e-mail: p.a.davies@aston.ac.uk

1Corresponding author.

2Present address: Faculty of Science, Engineering and Computing, Kingston University, London SW15 3DW, UK.

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 September 3, 2014; final manuscript received January 18, 2016; published online February 23, 2016. Assoc. Editor: Dr. Akiba Segal.

J. Sol. Energy Eng 138(3), 031001 (Feb 23, 2016) (10 pages) Paper No: SOL-14-1250; doi: 10.1115/1.4032682 History: Received September 03, 2014; Revised January 18, 2016

This paper outlines a novel elevation linear Fresnel reflector (ELFR) and presents and validates theoretical models defining its thermal performance. To validate the models, a series of experiments were carried out for receiver temperatures in the range of 30–100 °C to measure the heat loss coefficient, gain in heat transfer fluid (HTF) temperature, thermal efficiency, and stagnation temperature. The heat loss coefficient was underestimated due to the model exclusion of collector end heat losses. The measured HTF temperature gains were found to have a good correlation to the model predictions—less than a 5% difference. In comparison to model predictions for the thermal efficiency and stagnation temperature, measured values had a difference of −39% to +31% and 22–38%, respectively. The difference between the measured and predicted values was attributed to the low-temperature region for the experiments. It was concluded that the theoretical models are suitable for examining linear Fresnel reflector (LFR) systems and can be adopted by other researchers.

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References

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Figures

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Fig. 1

Schematic of the ELFR. The mirror elements rotate to reflect solar radiation to a secondary concentrator, but in contrast to a conventional LFR, the mirror elements are also adjustable in height to reduce shadowing and blocking of reflected rays.

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Fig. 2

Section view of the CPC cavity receiver

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Fig. 3

The ELFR experimental equipment setup for measuring an HTF's inlet and exit temperature

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Fig. 4

An aerial view of the ELFR (left) and the illuminated receiver during operation (right)

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Fig. 5

Experimental results showing the ELFR receiver achieving a steady-state inlet and exit temperature for an average fluid temperature of (a) 33 °C, (b) 40 °C, and (c) 60 °C. The ambient and average cover glazing temperatures are also plotted.

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Fig. 6

The measured and estimated heat loss coefficient for the ELFR's receiver

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Fig. 7

The ELFR receiving DNI and reaching a steady-state exit temperature for an inlet temperature of (a) 38 °C, (b) 45 °C, and (c) 55 °C

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Fig. 8

The measured and predicted exit temperatures for a range of inlet temperatures to the ELFR receiving DNI in the region of 750 W/m2

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Fig. 9

The optical efficiency estimate (based on measured thermal efficiency) and ray-tracing model prediction plotted against the transversal angle

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Fig. 10

Measured inlet, exit, pipe, and ambient temperature for determining the stagnation temperature at solar noon for a DNI of 760 W/m2

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