The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform

Doerte Laing - One of the best experts on this subject based on the ideXlab platform.

  • using Concrete and other solid Storage media in thermal energy Storage tes systems
    Advances in Thermal Energy Storage Systems#R##N#Methods and Applications, 2015
    Co-Authors: Doerte Laing, Stefan Zunft
    Abstract:

    Storing sensible heat in solids allows the highest Storage temperature levels and avoids the problem of high vapour pressure of liquid media. A wide choice of materials is usable and can deliver economically attractive solutions. Commercially available today are regenerator-type Storages, where a gaseous heat transfer fluid, such as flue gas or air, is in direct contact with a solid Storage medium and exchanges heat as it flows along a flow path through the Storage medium. Different advanced concepts, like Concrete Storage, advanced solutions for regenerators and solid media Storage based on particulate materials are described, including possible fields of application.

  • High-Temperature Solid-Media Thermal Energy Storage for Solar Thermal Power Plants
    Proceedings of the IEEE, 2012
    Co-Authors: Doerte Laing, Thomas Bauer, Carsten Bahl, Michael Fiß, Nils Breidenbach, Matthias Hempel
    Abstract:

    Solid sensible heat Storage is an attractive option for high-temperature Storage applications regarding investment and maintenance costs. Using Concrete as solid Storage material is most suitable, as it is easy to handle, the major aggregates are available all over the world, and there are no environmentally critical components. Long-term stability of Concrete has been proven in oven experiments and through strength measurements up to 500 °C. Material parameters and Storage performance have been validated in a 20-m3 test module with more than 23 months of operation between 200 °C and 400 °C and more than 370 thermal cycles. For an up-scaled Concrete Storage design with 1100-MWh capacity in a modular setup for a 50 MWel parabolic trough power plant of the ANDASOL-type, about 50 000 m3 of Concrete is required and the investment costs are approximately 38 million euro. The simulation of the annual electricity generation of a 50 MWel parabolic trough power plant with a 1100-MWh Concrete Storage illustrates that such plants can operate in southern Europe delivering about 3500 full load hours annually; about 30% of this electricity would be generated by the Storage system. This number will increase further, when improved operation strategies are applied. Approaches for further cost reduction using heat transfer structures with high thermal conductivity inside the Concrete are analyzed, leading to a 60% reduction in the number of heat exchanger pipes required. For implementation of the structures, the Storage is build up of precast Concrete blocks.

  • TEST AND EVALUATION OF A THERMAL ENERGY Storage SYSTEM FOR DIRECT STEAM GENERATION
    2011
    Co-Authors: Doerte Laing, Carsten Bahl, Michael Fiß, Martin Eickhoff, Matthias Hempel, Mirko Meyer-grünefeldt, Andreas Stückle
    Abstract:

    The test results of a combined Storage solution for direct steam generation in CSP plants with a Concrete Storage for superheating steam and a PCM Storage for evaporating water are reported. The high temperature Storage system was built in 2009 in a direct steam test loop, constructed at the power plant Litoral of Endesa in Carboneras, Spain. This system has a total capacity of ca. 1000 kWh and is the first demonstration of such a combined Storage system for the two phase heat transfer fluid water/steam. Cycling tests for each Storage unit separately and combined testing have proven design expectations. Various operation modes for the PCM Storage operation are evaluated.

  • COMBINED Storage SYSTEM DEVELOPMENTS FOR DIRECT STEAM GENERATION IN SOLAR THERMAL POWER PLANTS
    Proceedings of the ISES Solar World Congress 2011, 2011
    Co-Authors: Doerte Laing, Thomas Bauer, Carsten Bahl, Michael Fiß, Matthias Hempel, Mirko Meyer-grünefeldt, Martin Eickhoff
    Abstract:

    For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal energy. These new solar thermal power plants require innovative Storage concepts, where the two phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed for the two phase fluid water/steam. Concrete Storage is used for the process steps involving transfer of sensible heat – i.e. preheating of water and superheating of steam - while for the two-phase evaporation a phase change material (PCM) Storage will be deployed. This technology is currently being tested by DLR and Ed. Zublin AG within the project ITES, funded partly by the German Ministry for the Environment, Nature Conservation and Nuclear Safety. A combined Storage solution with a 22 m³ Concrete Storage test module for superheating of steam and a 8.5 m³ PCM-Storage for evaporation of water was build in 2009 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain. This high temperature Storage system has a total capacity of ca. 1000 kWh and is the first demonstration of such a combined Storage system for the two phase heat transfer fluid water/steam, details were reported in [Laing et al., 2009]. Cycle testing has started end of 2010. First, cycling tests for each Storage unit separately have been performed successfully, showing the expected discharge capacities of ca. 250 kWh for the Concrete unit and ca. 720 kWh for the PCM-Storage module. System operation in constant pressure mode and sliding pressure mode has been conducted for the PCM-Storage. While in the constant pressure mode the peak power of the Storage of more than 700 kW could be demonstrated, in the sliding pressure mode a constant power output over almost the whole charge and discharge period could be provided. Combined system operation was also proven in constant pressure and sliding pressure mode, showing good system operability. The paper will describe the Storage system and present the test results and evaluation of the single module testing as well as on the combined Storage system testing in different operation modes.

  • Thermal energy Storage for direct steam generation
    Solar Energy, 2011
    Co-Authors: Doerte Laing, Dorothea Lehmann, Thomas Bauer, Carsten Bahl, Wolf Dieter Steinmann
    Abstract:

    Abstract Parabolic trough power plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal power plants require innovative Storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed where a phase change material (PCM) Storage will be deployed for the two-phase evaporation, while Concrete Storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A Storage system with a total Storage capacity of approx. 1 MW h is described, combining a PCM module and a Concrete module. The Storage modules have been constructed for testing in a DSG-test facility specially erected at a conventional power plant of Endesa in Carboneras (Spain). Commissioning of the Storage system started in May 2010; testing under real steam conditions around 100 bar will begin in August 2010.

Carsten Bahl - One of the best experts on this subject based on the ideXlab platform.

  • High-Temperature Solid-Media Thermal Energy Storage for Solar Thermal Power Plants
    Proceedings of the IEEE, 2012
    Co-Authors: Doerte Laing, Thomas Bauer, Carsten Bahl, Michael Fiß, Nils Breidenbach, Matthias Hempel
    Abstract:

    Solid sensible heat Storage is an attractive option for high-temperature Storage applications regarding investment and maintenance costs. Using Concrete as solid Storage material is most suitable, as it is easy to handle, the major aggregates are available all over the world, and there are no environmentally critical components. Long-term stability of Concrete has been proven in oven experiments and through strength measurements up to 500 °C. Material parameters and Storage performance have been validated in a 20-m3 test module with more than 23 months of operation between 200 °C and 400 °C and more than 370 thermal cycles. For an up-scaled Concrete Storage design with 1100-MWh capacity in a modular setup for a 50 MWel parabolic trough power plant of the ANDASOL-type, about 50 000 m3 of Concrete is required and the investment costs are approximately 38 million euro. The simulation of the annual electricity generation of a 50 MWel parabolic trough power plant with a 1100-MWh Concrete Storage illustrates that such plants can operate in southern Europe delivering about 3500 full load hours annually; about 30% of this electricity would be generated by the Storage system. This number will increase further, when improved operation strategies are applied. Approaches for further cost reduction using heat transfer structures with high thermal conductivity inside the Concrete are analyzed, leading to a 60% reduction in the number of heat exchanger pipes required. For implementation of the structures, the Storage is build up of precast Concrete blocks.

  • TEST AND EVALUATION OF A THERMAL ENERGY Storage SYSTEM FOR DIRECT STEAM GENERATION
    2011
    Co-Authors: Doerte Laing, Carsten Bahl, Michael Fiß, Martin Eickhoff, Matthias Hempel, Mirko Meyer-grünefeldt, Andreas Stückle
    Abstract:

    The test results of a combined Storage solution for direct steam generation in CSP plants with a Concrete Storage for superheating steam and a PCM Storage for evaporating water are reported. The high temperature Storage system was built in 2009 in a direct steam test loop, constructed at the power plant Litoral of Endesa in Carboneras, Spain. This system has a total capacity of ca. 1000 kWh and is the first demonstration of such a combined Storage system for the two phase heat transfer fluid water/steam. Cycling tests for each Storage unit separately and combined testing have proven design expectations. Various operation modes for the PCM Storage operation are evaluated.

  • COMBINED Storage SYSTEM DEVELOPMENTS FOR DIRECT STEAM GENERATION IN SOLAR THERMAL POWER PLANTS
    Proceedings of the ISES Solar World Congress 2011, 2011
    Co-Authors: Doerte Laing, Thomas Bauer, Carsten Bahl, Michael Fiß, Matthias Hempel, Mirko Meyer-grünefeldt, Martin Eickhoff
    Abstract:

    For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal energy. These new solar thermal power plants require innovative Storage concepts, where the two phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed for the two phase fluid water/steam. Concrete Storage is used for the process steps involving transfer of sensible heat – i.e. preheating of water and superheating of steam - while for the two-phase evaporation a phase change material (PCM) Storage will be deployed. This technology is currently being tested by DLR and Ed. Zublin AG within the project ITES, funded partly by the German Ministry for the Environment, Nature Conservation and Nuclear Safety. A combined Storage solution with a 22 m³ Concrete Storage test module for superheating of steam and a 8.5 m³ PCM-Storage for evaporation of water was build in 2009 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain. This high temperature Storage system has a total capacity of ca. 1000 kWh and is the first demonstration of such a combined Storage system for the two phase heat transfer fluid water/steam, details were reported in [Laing et al., 2009]. Cycle testing has started end of 2010. First, cycling tests for each Storage unit separately have been performed successfully, showing the expected discharge capacities of ca. 250 kWh for the Concrete unit and ca. 720 kWh for the PCM-Storage module. System operation in constant pressure mode and sliding pressure mode has been conducted for the PCM-Storage. While in the constant pressure mode the peak power of the Storage of more than 700 kW could be demonstrated, in the sliding pressure mode a constant power output over almost the whole charge and discharge period could be provided. Combined system operation was also proven in constant pressure and sliding pressure mode, showing good system operability. The paper will describe the Storage system and present the test results and evaluation of the single module testing as well as on the combined Storage system testing in different operation modes.

  • Thermal energy Storage for direct steam generation
    Solar Energy, 2011
    Co-Authors: Doerte Laing, Dorothea Lehmann, Thomas Bauer, Carsten Bahl, Wolf Dieter Steinmann
    Abstract:

    Abstract Parabolic trough power plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal power plants require innovative Storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed where a phase change material (PCM) Storage will be deployed for the two-phase evaporation, while Concrete Storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A Storage system with a total Storage capacity of approx. 1 MW h is described, combining a PCM module and a Concrete module. The Storage modules have been constructed for testing in a DSG-test facility specially erected at a conventional power plant of Endesa in Carboneras (Spain). Commissioning of the Storage system started in May 2010; testing under real steam conditions around 100 bar will begin in August 2010.

  • Test Results of a Combined Storage System for Parabolic Trough Power Plants With Direct Steam Generation
    ASME 2011 5th International Conference on Energy Sustainability Parts A B and C, 2011
    Co-Authors: Doerte Laing, Michael Fiß, Martin Eickhoff, Matthias Hempel, Mirko Meyer-grünefeldt, Carsten Bahl
    Abstract:

    For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal energy. These new solar thermal power plants require innovative Storage concepts, where the two phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed for the two phase fluid water/steam. Concrete Storage is used for the process steps involving transfer of sensible heat — i.e. preheating of water and superheating of steam — while for the two-phase evaporation a phase change material (PCM) Storage will be deployed. This technology is currently developed by DLR and Ed. Zublin AG within the project ITES, funded partly by the German Ministry for the Environment, Nature Conservation and Nuclear Safety. A combined Storage solution with a 22 m3 Concrete Storage test module for superheating of steam and a 8.5 m3 PCM-Storage for evaporation of water was build in 2009 in a direct steam test loop, set up at the power plant Litoral of Endesa in Carboneras, Spain. This high temperature Storage system has a total capacity of approx. 1000 kWh and it will be the first demonstration of such a combined Storage system for the two phase heat transfer fluid water/steam. Commissioning was completed in 2010, implying first heating-up of the Concrete Storage to expel the excess water in the Concrete, first heating-up of the PCM Storage including final filling of the Storage with salt. Cycling tests for each Storage unit separately are in progress. Combined testing will start in 2011. Results on the commissioning and testing will be reported in the paper.Copyright © 2011 by ASME

Wolf Dieter Steinmann - One of the best experts on this subject based on the ideXlab platform.

  • The CellFlux Storage concept for cost reduction in parabolic trough solar thermal power plants
    Energy Procedia, 2020
    Co-Authors: Christian Odenthal, Wolf Dieter Steinmann, Markus Eck Und Doerte Laing
    Abstract:

    Abstract Although facility scale thermal energy Storage of sensible heat in the range of 200-550 °C has achieved a high maturity, state-of- the-art approaches are still not very cost effective. An innovative Storage concept is thus proposed that avoids the two major cost- driving factors of the Concrete Storage and 2-tank molten salt systems. First, the Storage volume is comprised of low-cost sensible Storage material such as Concrete, natural stone or clinker bricks. These materials are several times cheaper than eutectic salt mixtures used in the 2-tank-Storage system. Secondly, the system uses an intermediate air cycle, allowing for direct contact with the Storage material. The necessary heat exchanger for transferring the heat from the primary oil loop to the intermediate air cycle consists of significantly less steel compared to the tube register inside the Concrete Storage. Dynamic models of the Storage system have been implemented in a Matlab/Simulink environment to analyze its performance theoretically. The investigations show, that the overall performance and profitability of the Storage system are mainly linked to the thermal efficiency and pressure drop of the heat exchanger, as well as the operation strategy. To demonstrate the feasibility of the Storage concept and to investigate its performance characteristic under realistic conditions, a pilot scale test facility is set up.

  • Thermal energy Storage for direct steam generation
    Solar Energy, 2011
    Co-Authors: Doerte Laing, Dorothea Lehmann, Thomas Bauer, Carsten Bahl, Wolf Dieter Steinmann
    Abstract:

    Abstract Parabolic trough power plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal power plants require innovative Storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed where a phase change material (PCM) Storage will be deployed for the two-phase evaporation, while Concrete Storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A Storage system with a total Storage capacity of approx. 1 MW h is described, combining a PCM module and a Concrete module. The Storage modules have been constructed for testing in a DSG-test facility specially erected at a conventional power plant of Endesa in Carboneras (Spain). Commissioning of the Storage system started in May 2010; testing under real steam conditions around 100 bar will begin in August 2010.

  • Thermal energy Storage for direct steam generation
    Solar Energy, 2011
    Co-Authors: Doerte Laing, Dorothea Lehmann, Christian Bahl, Thomas Bauer, Wolf Dieter Steinmann
    Abstract:

    Parabolic trough power plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal power plants require innovative Storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed where a phase change material (PCM) Storage will be deployed for the two-phase evaporation, while Concrete Storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A Storage system with a total Storage capacity of approx. 1. MW. h is described, combining a PCM module and a Concrete module. The Storage modules have been constructed for testing in a DSG-test facility specially erected at a conventional power plant of Endesa in Carboneras (Spain). Commissioning of the Storage system started in May 2010; testing under real steam conditions around 100. bar will begin in August 2010. © 2010 Elsevier Ltd.

  • economic analysis and life cycle assessment of Concrete thermal energy Storage for parabolic trough power plants
    Journal of Solar Energy Engineering-transactions of The Asme, 2010
    Co-Authors: Doerte Laing, P. Viebahn, Frauke Gräter, Wolf Dieter Steinmann, Carsten Bahl
    Abstract:

    For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat Storage is an attractive option in terms of investment and maintenance costs. One important aspect in Storage development is the Storage integration into the power plant. A modular operation concept for thermal Storage systems was previously suggested by DLR, showing an increase in Storage capacity of more than 100 %. However, in these investigations, the additional costs needed to implement this Storage concept into the power plant, like for extra piping, valves, pumps and control had not been considered. These aspects are discussed in this paper, showing a decrease of levelized energy costs with modular Storage integration of 2 to 3 %. In a Life Cycle Assessment (LCA) a comparison of an AndaSol-I type solar thermal power plant [1] with the original two-tank molten salt Storage and with a "hypothetical" Concrete Storage shows an advantage of the Concrete Storage technology concerning environmental impacts. The environmental impacts of the “hypothetical” Concrete based AndaSol-I decrease by 7 %, considering 1 kWh of solar electricity delivered to the grid. Regarding only the production of the power plant, the emissions decrease by 9.5 %.

  • Economic Analysis and Life Cycle Assessment of Concrete Thermal Energy Storage for Parabolic Trough Power Plants
    Journal of Solar Energy Engineering, 2010
    Co-Authors: Doerte Laing, P. Viebahn, Frauke Gräter, Wolf Dieter Steinmann, Christian Bahl
    Abstract:

    For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat Storage is an attractive option in terms of investment and maintenance costs. One important aspect in Storage development is the Storage integration into the power plant. A modular operation concept for thermal Storage systems was previously suggested by DLR, showing an increase in Storage capacity of more than 100%. However, in these investigations, the additional costs needed to implement this Storage concept into the power plant, such as for extra piping, valves, pumps, and control, had not been considered. These aspects are discussed in this paper, showing a decrease in levelized energy costs with a modular Storage integration of 2-3%. In a life cycle assessment a comparison of an AndaSol-I type solar thermal power plant with the original two-tank molten salt Storage and with a hypothetical Concrete Storage shows an advantage of the Concrete Storage technology concerning environmental impacts. The environmental impacts of the hypothetical Concrete based AndaSol-I decreased by 7%, considering 1 kW h of solar electricity delivered to the grid. Regarding only the production of the power plant, the emissions decreased by 9.5%.

Christian Bahl - One of the best experts on this subject based on the ideXlab platform.

  • Thermal energy Storage for direct steam generation
    Solar Energy, 2011
    Co-Authors: Doerte Laing, Dorothea Lehmann, Christian Bahl, Thomas Bauer, Wolf Dieter Steinmann
    Abstract:

    Parabolic trough power plants with direct steam generation are a promising option for future cost reduction in comparison to the SEGS type technology. These new solar thermal power plants require innovative Storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part Storage system is proposed where a phase change material (PCM) Storage will be deployed for the two-phase evaporation, while Concrete Storage will be used for storing sensible heat, i.e. for preheating of water and superheating of steam. A Storage system with a total Storage capacity of approx. 1. MW. h is described, combining a PCM module and a Concrete module. The Storage modules have been constructed for testing in a DSG-test facility specially erected at a conventional power plant of Endesa in Carboneras (Spain). Commissioning of the Storage system started in May 2010; testing under real steam conditions around 100. bar will begin in August 2010. © 2010 Elsevier Ltd.

  • Economic Analysis and Life Cycle Assessment of Concrete Thermal Energy Storage for Parabolic Trough Power Plants
    Journal of Solar Energy Engineering, 2010
    Co-Authors: Doerte Laing, P. Viebahn, Frauke Gräter, Wolf Dieter Steinmann, Christian Bahl
    Abstract:

    For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat Storage is an attractive option in terms of investment and maintenance costs. One important aspect in Storage development is the Storage integration into the power plant. A modular operation concept for thermal Storage systems was previously suggested by DLR, showing an increase in Storage capacity of more than 100%. However, in these investigations, the additional costs needed to implement this Storage concept into the power plant, such as for extra piping, valves, pumps, and control, had not been considered. These aspects are discussed in this paper, showing a decrease in levelized energy costs with a modular Storage integration of 2-3%. In a life cycle assessment a comparison of an AndaSol-I type solar thermal power plant with the original two-tank molten salt Storage and with a hypothetical Concrete Storage shows an advantage of the Concrete Storage technology concerning environmental impacts. The environmental impacts of the hypothetical Concrete based AndaSol-I decreased by 7%, considering 1 kW h of solar electricity delivered to the grid. Regarding only the production of the power plant, the emissions decreased by 9.5%.

  • Concrete THERMAL ENERGY Storage FOR SOLAR THERMAL POWER PLANTS AND INDUSTRIAL PROCESS HEAT
    SolarPACES 2009, 2009
    Co-Authors: Christian Bahl, Doerte Laing, Michael Hempel, Andreas Stückle
    Abstract:

    Economic Storage of thermal energy is a key technological issue for solar thermal power plants and industrial waste heat recovery. Low temperature Storage systems are based almost entirely on sensible heat Storage using liquid water. For temperatures exceeding 100 °C, non-pressurized liquid water cannot be used as a Storage medium. The use of pressure vessels makes this technology unattractive for higher temperatures. Other liquid Storage media with higher evaporation temperatures such as oil or molten salt could be used, having other disadvantages such as e.g. degradation or high freezing points. An attractive option regarding investment and maintenance costs is the application of solid sensible heat Storage media with Concrete. Also the wide range of possible working temperatures and the modular structure make the heat Storage in Concrete attractive. Heat Storage systems using Concrete as the Storage material have been developed by Ed. Züblin AG and DLR for parabolic trough solar thermal power plants. A 20 m³ solid media Storage test module with a thermal Storage capacity of 400 kWh was built and tested in Stuttgart and will have accumulated 16 months of operation in the temperature range between 300 °C and 400 °C and about 270 thermal cycles by September 2009. The simulation of the annual electricity generation of a parabolic trough power plant with a 1,100 MWh Concrete Storage shows that such plants could operate for approx. 4,550 hours annually, delivering approx. 3,500 full load hours in southern Europe. This number will further increase, when improved operation strategies are applied.

  • Concrete Storage for solar thermal power plants and industrial process heat
    … Renewable Energy Storage …, 2008
    Co-Authors: Doerte Laing, Christian Bahl, D. Lehmann, Ag Züblin
    Abstract:

    Economic Storage of thermal energy is a technological key issue for solar thermal power plants and industrial waste heat recovery. Systems using single phase heat transfer fluids like thermal oil, pressurized water, air or superheated steam, demand Storage systems for sensible heat. A sensible heat Storage system using Concrete as Storage material has been developed by Ed. Züblin AG and DLR. A major focus was the cost reduction of the heat exchanger and the high temperature Concrete Storage material. For live tests and further improvements a second generation 20 m³ solid media Storage test module was built in Stuttgart and is cycled by an electrically heated thermal oil loop. By end of October 2008 the second generation solid media Storage test module had accumulated four months of operation in the temperature range between 300 °C and 400 °C and about 50 thermal cycles with a temperature difference of 40 K. The tests will be continued until June 2009. Application fields for the Concrete Storage technology are parabolic trough solar thermal power plants; industrial waste heat recovery at elevated temperatures; thermal management of decentralized combined heat and power systems for increased flexibility and other high temperature processes. Especially the wide range of possible working temperatures and the modular structure make the heat Storage in Concrete attractive.

Nicolas Calvet - One of the best experts on this subject based on the ideXlab platform.

  • Demonstration of EnergyNest thermal energy Storage (TES) technology
    2017
    Co-Authors: Nils Hoivik, Christopher Greiner, Eva Bellido Tirado, Juan Barragan, Pål Bergan, Geir Skeie, Pablo Blanco, Nicolas Calvet
    Abstract:

    This paper presents the experimental results from the EnergyNest 2 × 500 kWhth thermal energy Storage (TES) pilot system installed at Masdar Institute of Science & Technology Solar Platform. Measured data are shown and compared to simulations using a specially developed computer program to verify the stability and performance of the TES. The TES is based on a solid-state Concrete Storage medium (HEATCRETE®) with integrated steel tube heat exchangers cast into the Concrete. The unique Concrete recipe used in the TES has been developed in collaboration with Heidelberg Cement; this material has significantly higher thermal conductivity compared to regular Concrete implying very effective heat transfer, at the same time being chemically stable up to 450 °C. The demonstrated and measured performance of the TES matches the predictions based on simulations, and proves the operational feasibility of the EnergyNest Concrete-based TES. A further case study is analyzed where a large-scale TES system presented in this article is compared to two-tank indirect molten salt technology.This paper presents the experimental results from the EnergyNest 2 × 500 kWhth thermal energy Storage (TES) pilot system installed at Masdar Institute of Science & Technology Solar Platform. Measured data are shown and compared to simulations using a specially developed computer program to verify the stability and performance of the TES. The TES is based on a solid-state Concrete Storage medium (HEATCRETE®) with integrated steel tube heat exchangers cast into the Concrete. The unique Concrete recipe used in the TES has been developed in collaboration with Heidelberg Cement; this material has significantly higher thermal conductivity compared to regular Concrete implying very effective heat transfer, at the same time being chemically stable up to 450 °C. The demonstrated and measured performance of the TES matches the predictions based on simulations, and proves the operational feasibility of the EnergyNest Concrete-based TES. A further case study is analyzed where a large-scale TES system presented in thi...

  • new concentrating solar power facility for testing high temperature Concrete thermal energy Storage
    Energy Procedia, 2015
    Co-Authors: Matthieu Martins, Pål Bergan, Uver Villalobos, Thomas Delclos, Peter R Armstrong, Nicolas Calvet
    Abstract:

    Abstract Several thermal energy Storage (TES) systems have been developed and tested to be integrated in concentrating solar power (CSP) systems. Recent studies show that Concrete as Storage media has the potential to become an interesting solution due to its properties such as relatively high specific heat and thermal conductivity, good mechanical properties, a thermal expansion coefficient similar to that of steel pipe and low cost of a material that is easy to obtain and process. This article outlines a new 100 kW th solar beam-down facility for testing high temperature Concrete Storage at 393°C and the first project to use the facility for TES testing in collaboration with NEST. Initial Concrete characterization and testing results which show promising thermal and mechanical performance, are also presented. The CSP hot oil-loop has been modified and instrumented to perform research and testing of TES systems in real solar radiation conditions. Experimental TES system testing at real scale with a total Storage capacity of 1.0 MWh th is planned to begin operation early 2015.