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Research Papers

Prototype Testing of a Centrifugal Particle Receiver for High-Temperature Concentrating Solar Applications

[+] Author and Article Information
Wei Wu, David Trebing, Lars Amsbeck

Institute of Solar Research,
German Aerospace Center (DLR),
Stuttgart 70569, Germany

Reiner Buck

Institute of Solar Research,
German Aerospace Center (DLR),
Stuttgart 70569, Germany
e-mail: reiner.buck@dlr.de

Robert Pitz-Paal

Institute of Solar Research,
German Aerospace Center (DLR),
Cologne 51147, Germany

1Corresponding author.

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 April 25, 2014; final manuscript received March 25, 2015; published online June 16, 2015. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 137(4), 041011 (Aug 01, 2015) (7 pages) Paper No: SOL-14-1127; doi: 10.1115/1.4030657 History: Received April 25, 2014; Revised March 25, 2015; Online June 16, 2015

A novel concept of a particle receiver for high-temperature solar applications was developed and evaluated in the present work. The so-called Centrifugal Particle Receiver (CentRec) uses small bauxite particles as absorber, heat transfer, and storage medium at the same time. Due to advantageous optical and thermal properties, the particles can be heated up to 1000 °C without sintering in the storage. High thermal efficiencies at high outlet temperatures are expected indicating a promising way for cost reduction in solar power tower applications. A 15kWth prototype was designed, built, and tested in order to demonstrate the feasibility and potential of the proposed concept. Extensive high flux experiments were conducted, investigating the thermal receiver performance and efficiency. For an input flux of 670 kW m−2, the target outlet temperature of 900 °C at a receiver efficiency of about 75% was successfully demonstrated.

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Figures

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Fig. 1

Assembly drawing of the CentRec prototype

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Fig. 2

Measured wall and outlet temperatures and calculated SD. α = 45 deg andm·nom = 9.5 g s-1.

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Fig. 4

(a) Temperature distribution recorded by IR camera. (b) Qualitative comparison of temperature distributions measured by IR camera and TCs. Solid straight lines denote the temperature distribution along the line displayed in (a) for six considered circumferential positions. α = 45 deg,m·nom = 4 g s-1, and q·in = 370 kW m-2.

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Fig. 3

Measured wall and outlet temperatures and calculated SD. α = 45 deg,m·nom = 3 g s-1,and q·in = 370 kW m-2.

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Fig. 5

Measured wall and outlet temperatures and calculated SD. α = 90 deg,m·nom = 8 g s-1,and q·in = 670 kW m-2.

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Fig. 6

Particle outlet temperature and receiver efficiency with respect to mass flow rate for α = 45 deg

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