A Design Study for Regenerator-type Heat Storage in Solar Tower Plants–Results and Conclusions of the HOTSPOT Project

Zunft, Stefan; Hänel, Matthias; Krüger, Michael; Dreißigacker, Volker

doi:10.1016/j.egypro.2014.03.118

Cited by 34 publications

(14 citation statements)

References 8 publications

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“…In terms of the packed bed it is assumed that the particles have the same size and a round shape which results in a porosity of approximately 40%. Basalt is the material of choice for the packed bed since it is widely available, mechanically stable and has a high volumetric heat capacity [2]. In terms of material with flow channels (FC) the porosity can be specifically designed.…”

Section: Definition Of Input Parametersmentioning

confidence: 99%

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

2015

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The CellFlux concept is a new sensible storage system where thermal energy from a primary working fluid (HTF) is transferred to an intermediate working fluid (IWF) which flows in direct contact through a cost effective packed bed solid sensible storage material. The IWF is kept in a closed loop, conveyed by a fan. It is possible to combine multiple storage modules to a large system. The paper presents the results of the analysis of a single storage cell. Various options for the combination of storage cells in a storage unit are described; the importance of the concept selected for the integration of the storage unit into the power plant is shown. The combination of CellFlux with molten salt HTFs is introduced and results from cost estimations are given.

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Section: Definition Of Input Parametersmentioning

confidence: 99%

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

2015

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“…Packed bed regenerators exhibit high heat transfer rates, offering the potential for efficient, low cost storage (Zunft et al, 2014). This technology was successfully integrated into a Concentrating Solar Power (CSP) plant during the TSA-PHOEBUS (Technology program Solar Air Receiver) project.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis of a high temperature packed bed thermal storage design for a solar gas turbine

2015

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“…For example, the sensible heat storage concept and technical implementation details of the Solar Tower power plant of Jülich (STJ) Germany, has been described in detail in several publications. The storage system consists of a rectangular housing of 7m x 7m x 6m size [10,11]. Instead of pursuing a monolithic design, its volume is partitioned into four chambers of identical size, connected in parallel through a dome and connecting pipes (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…(a) View of current TES sensible heat concept in STJ; (b) inventory materials considered before decision in favor of ceramic honeycombs in an orthogonal shaped containment; (c) actual ceramic honeycomb employed (length x width x height: 150mm x150mm x300mm) (From[11]). From left to right: Typical cordierite mini-honeycombs (a)-(c) and foams (d)-(f) on the TGA holder before coating, after coating and after TGA cyclic redox cycling respectively.…”

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confidence: 99%

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

2015

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The enthalpy effects of reversible chemical reactions can be exploited for the so-called thermochemical storage of solar energy. Oxides of multivalent metals in particular, capable of being reduced and oxidized under air atmosphere with significant heat effects are perfect candidates for air-operated Concentrated Solar Power plants since in this case air can be used as both the heat transfer fluid and the reactant (O 2 ) and therefore can come to direct contact with the storage material (oxide). Based on the characteristics of the oxide redox pair Co 3 O 4 /CoO as a thermochemical heat storage medium and the advantages of porous ceramic structures like honeycombs and foams in heat exchange applications, the idea of employing such structures either coated with or entirely made of a redox material like Co 3 O 4 , as a hybrid sensible-thermochemical solar energy storage system in air-operated Concentrated Solar Power plants has been set forth and tested. At first, small-scale, redox-inert, cordierite foams and honeycombs were coated with Co 3 O 4 and tested for cyclic reduction-oxidation operation via Thermo-Gravimetric Analysis. Such Co 3 O 4 -coated supports exhibited repeatable operation within the temperature range 800-1000 o C for many cycles, employing all the redox material incorporated, even at very high redox oxide loading levels. To improve the volumetric heat storage capacity of such reactors, ceramic foams made entirely of Co 3 O 4 were manufactured. Such foams exhibited satisfactory structural integrity and were comparatively tested vs. the "plain" Co 3 O 4 powder and the Co 3 O 4 -coated, cordierite supports under the same cyclic redox conditions up to 15 consecutive cycles. The Co 3 O 4 -made porous foams were proved also capable of cyclic reductionoxidation, exploiting the entire amount of Co 3 O 4 used in their manufacture, maintaining simultaneously their structural integrity.

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A Design Study for Regenerator-type Heat Storage in Solar Tower Plants–Results and Conclusions of the HOTSPOT Project

Cited by 34 publications

References 8 publications

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

Parametric analysis of a high temperature packed bed thermal storage design for a solar gas turbine

Hybrid Sensible/Thermochemical Solar Energy Storage Concepts Based on Porous Ceramic Structures and Redox Pair Oxides Chemistry

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