The CellFlux Storage Concept for Cost Reduction in Parabolic Trough Solar Thermal Power Plants

Odenthal, Christian; Steinmann, Wolf-Dieter; Laing, Markus Eck und Doerte

doi:10.1016/j.egypro.2014.01.167

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…The two systems having 490°C upper temperature are the most promising since it remains questionable if Hitec HTS can be operated safely in the long term at temperatures higher than 490 °C. As shown previously from a simplified approach [3] utilizing water vapour as intermediate working fluid instead of air can contribute to additional cost savings of about 10%. A direct storage system utilizing Hitec HTS is inferior in any case.…”

Section: Results For Different Hitec Hts Configurations and Vp1mentioning

confidence: 96%

“…), three major influence variables can be identified, namely particle (PB) / hydraulic (FC) diameter, mass flux and allowed change of exit temperature. The importance of the latter parameter has been described in [3]. The remaining parameters are within tight bounds or even fixed.…”

Section: Modelling and Sizing Approachmentioning

confidence: 99%

“…Since both have similar thermodynamic properties and clinker has been used in the pilot plant, focus lies on this material. Other gases than air are promising alternatives [3] but focus lies on air. If multiple storage volumes are connected in series it would be possible diverting the air stream around those storage volumes where currently no heat is transferred.…”

Section: Definition Of Input Parametersmentioning

confidence: 99%

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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: Results For Different Hitec Hts Configurations and Vp1mentioning

confidence: 96%

Section: Modelling and Sizing Approachmentioning

confidence: 99%

Section: Definition Of Input Parametersmentioning

confidence: 99%

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The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

2015

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“…Since 14 CellFlux modules are necessary, all prices must be multiplied by 14 to calculate total costs for a 50 MW power plant. An 8 hour storage volume with 140 MW thermal power operating with a temperature difference of 100 Kelvin would need 100,000 tons of basalt or clinker brick storage material, if the utilization of the storage material is around 45% [5]. This value, however, is strongly dependent on the construction and operation strategy of the storage volume but is a realistic estimate.…”

Section: Cost Estimation For Various Cellflux Modulesmentioning

confidence: 96%

The CellFlux Storage Concept for Increased Flexibility in Sensible Heat Storage

2015

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Packed beds using air at atmospheric pressure as heat transferringmedium are the most cost effective systems for sensible heat storage. The basic idea of the CellFlux concept is to apply this concept also for liquid and/or pressurized primary HTFs by the introduction of an intermediate working fluid cycle. A heat exchanger is used for transferring energy between the primary HTF and the intermediate air cycle which eventually transfers the energy to a packed bed. The CellFlux concept can be implemented by using standard components. Essential is the minimization of efficiency losses resulting from the circulation of the air as well as the heat transfer processes within the heat exchanger and the storage volume. Some example cost estimations for the heat exchanger are given. The feasibility of the CellFlux concept has been proven by a pilot scale test facility operated at a maximum temperature of 380 °C and 100 kW. A novel approach promising further cost reductions has been applied by realizing a horizontal flow direction. Results from the theoretical and experimental analysis of the CellFlux concept will be presented. Distinctive for the CellFlux concept is the flexibility regarding working fluid (thermal oil, molten salt, pressurized water, CO 2 ), temperature range (0-800 °C), power (kW-multi MW) and storage medium (rocks, clinker bricks, concrete). This allows a wide range of applications.An example for application in combined heat and power will be given.

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“…The CellFlux concept has been developed as an alternative solution for sensible heat storage [1]. The storage system consists of a regenerator type storage volume and a finned tube heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Proof-of-concept and advancement of the CellFlux concept

Odenthal¹,

Steinmann²

2016

AIP Conference Proceedings

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Abstract. The CellFlux storage system is a new concept for reducing the costs of medium to high temperature thermal energy storage. Initially designed for solar thermal power plants, the concept is suitable for industrial processes and power to heat applications as well. This paper gives first results of a new pilot scale plant set up at DLR in Stuttgart as a proof of concept. Experimental results are used for the validation of a simplified model. The model is apllied to calculate pareto optimal storage configurations in terms of necessary storage mass and exergetic efficiency, suitable for two types of solar thermal power plants. Particularly for applications having larger temperature differences, high exergetic efficiencies at low costs for the storage material can be achieved.

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The CellFlux Storage Concept for Cost Reduction in Parabolic Trough Solar Thermal Power Plants

Cited by 6 publications

References 5 publications

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

The CellFlux Concept as an Alternative Solution for Sensible Heat Storage

The CellFlux Storage Concept for Increased Flexibility in Sensible Heat Storage

Proof-of-concept and advancement of the CellFlux concept

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