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Technical Briefs

Survey of Heliostat Concepts for Cost Reduction

[+] Author and Article Information
Andreas Pfahl

German Aerospace Center (DLR),
Institute of Solar Research,
Pfaffenwaldring 38-40,
D70569 Stuttgart, Germany
e-mail: Andreas.Pfahl@dlr.de

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received December 16, 2011; final manuscript received April 15, 2013; published online July 15, 2013. Assoc. Editor: Manuel Romero Alvarez.

J. Sol. Energy Eng 136(1), 014501 (Jul 15, 2013) (9 pages) Paper No: SOL-11-1287; doi: 10.1115/1.4024243 History: Received December 16, 2011; Revised April 15, 2013

A survey of hitherto concepts for cost reduction of heliostats is given. The survey might serve as a base for the development of low cost heliostats that are needed to meet the current challenging cost objectives. The concepts are related to the main heliostat subfunctions and to basic approaches for cost reduction found so far. Based on the main advantages and drawbacks of every concept, the most promising ones are indicated.

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Figures

Grahic Jump Location
Fig. 1

Left and middle: horizontal primary axes and linear drives [37], left autonomous [5]; right: multilever heliostat [47]

Grahic Jump Location
Fig. 2

Left: elevation axis at ground level, linear and rim drive, small extra mirror for off-set correction [43]; middle: big carousel type heliostat with framework pylon [21]; right: ground anchor, framework pylon and cable drives [20]

Grahic Jump Location
Fig. 3

Left: locking of elevation drive during stow (for locking the black bolt is positioned by the azimuth drive into the gray cramp) and framework facets; middle: concrete heliostat; both seen at Themis solar power plant; right: Yoke [61]

Grahic Jump Location
Fig. 4

Left: pretensioning of azimuth drive via spring to reduce impact of back lash; right: elevation axis between torque tube and mirrors to avoid huge bearings around continuous torque tube and to reduce lever arm of gravity loads of mirror panel [17]

Grahic Jump Location
Fig. 5

Left and middle: rotation by variation of center of gravity by water channel system [6], if rolling on ground (left) no locking of orientation is possible and high mass would be needed for wind load resistance; right: hydraulic drive with fluid containers [18] (no test results known)

Grahic Jump Location
Fig. 6

Left: inflatable heliostat [41]; right: target aligned heliostat with ganged facets [48]

Grahic Jump Location
Fig. 7

Left: ganged normal vectors: ends of parallel orange vectors to the sun move on spherical shapes. The blue normal vectors of the mirror planes are fixed to the green vectors to the receiver and to the ends of the orange sun vectors and can be connected by a horizontal rod (blue) to realize ganged normal vectors (compare Ref. [29]); right: ganged heliostats according to Ref. [30] (not tested yet).

Grahic Jump Location
Fig. 8

Rim drives; left and middle: with vertical primary axis and suspension of mirror facets [65] (left) or with stretched membrane, chain-rims and suspension of rim of secondary axis [64] (middle); right: with horizontal primary axis [10] (not tested yet)

Grahic Jump Location
Fig. 9

Approaches for lowering mirror panel at storm condition (not tested yet)

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