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Guédez, Rafael
Publications (10 of 12) Show all publications
Benmakhlouf, Y., Guédez, R., Wallmander, J. & Laumert, B. (2019). A methodology to assess the market potential and identify most promising business cases for small scale CSP plants with thermal energy storage. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 130001.
Open this publication in new window or tab >>A methodology to assess the market potential and identify most promising business cases for small scale CSP plants with thermal energy storage
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 130001Conference paper, Published paper (Refereed)
Abstract [en]

This study presents a methodology to quantify the market potential for a novel distributed CSP technology with thermal energy technology. The system in question relies on the Stirling engine for power production, which is fed by heat collected from a heliostat field and stored in an integrated latent heat storage unit. Selected countries in the MENA region are investigated to identify best prospective business cases for such a technology. With a global market potential above 40 GW in the whole MENA, industrial sectors such as mining and cement hold the best prospects in terms of market share. The achievable costs of generation vary depending on the DNI of the sites considered but prove to be lower compared with conventional distributed generation (diesel gensets or PV-BEES). However, several countries in the MENA, although having high DNI resource, still offer low electricity utility prices to industrial customers for distributed CSP to become competitive with on-grid electricity procurement. A scenario analysis coupled with a multi criteria selection of the optimal business case quantifies the amount of subsidies necessary to reach competitiveness.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-262565 (URN)10.1063/1.5117643 (DOI)2-s2.0-85070646541 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Pan, C. A., Guédez, R., Dinter, F. & Harms, T. M. (2019). A techno-economic comparative analysis of thermal oil and molten salt parabolic trough power plants with molten salt solar towers. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 120014.
Open this publication in new window or tab >>A techno-economic comparative analysis of thermal oil and molten salt parabolic trough power plants with molten salt solar towers
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 120014Conference paper, Published paper (Refereed)
Abstract [en]

This study presents a comparison between thermal oil and molten salt parabolic trough power plants as well as molten salt solar towers. Although higher temperature differences in solar towers enable higher power cycle efficiencies, the necessity of large solar fields for increasing turbine capacities and capacity factors pose a limitation through increased attenuation losses. This effect is amplified when unfavourable atmospheric conditions with visibilities of e.g. 15km are present to the extent where 200 MW parabolic trough power plants with molten salt as heat transfer fluid can achieve lower levelised costs of electricity and higher capacity factors than solar towers. Additionally, solar towers require a significantly larger solar field and thus land area as compared to molten salt parabolic through power plants. Moreover, both molten salt parabolic troughs and solar towers outperform thermal oil parabolic trough systems in terms of LCOE and capacity factors.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-262568 (URN)10.1063/1.5117632 (DOI)2-s2.0-85070614006 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191024

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2019-10-24Bibliographically approved
Sorce, A., Giugno, A., Marino, D., Piola, S. & Guédez, R. (2019). Analysis of a combined cycle exploiting inlet conditioning technologies for power modulation. In: Proceedings of the ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, 2019, Vol 3. Paper presented at ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019; Phoenix; United States; 17 June 2019 through 21 June 2019. ASME Press
Open this publication in new window or tab >>Analysis of a combined cycle exploiting inlet conditioning technologies for power modulation
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2019 (English)In: Proceedings of the ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, 2019, Vol 3, ASME Press, 2019Conference paper, Published paper (Refereed)
Abstract [en]

The high share of non-dispatchable renewable energy source generators in the electrical grid has increased the need for flexibility of Gas Turbine Combined Cycles (GTCC) already installed. To maximize not only the maximum power produced, via Power Augmentation Technologies (PATs), but also to reduce the Minimum Environmental Load (MEL), both OEMs and GTCC owners have adopted several technical solutions. This kind of flexibility has become, year-by-year, ever more crucial to guarantee GTCC economical sustainability. Amongst the solutions which can be adapted to guarantee GTCC flexibility, the Inlet Conditioning System is a particularly interesting technical solution, which can be installed without restrictions related to the different GT design. In this paper, an evaluation of the compressor inlet temperature effect over the Combined Cycle performance is presented, with a focus on the bottoming Cycle impact. Different Inlet Conditioning Strategies are then compared considering the energy, and the environmental impact on GTCC behavior. The performance of a layout including a Thermal Energy Storage (TES) and a Heat Pump (HP) is then evaluated and compared to other technical solutions.

Place, publisher, year, edition, pages
ASME Press, 2019
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-266198 (URN)10.1115/GT2019-91541 (DOI)000502158200045 ()2-s2.0-85071843768 (Scopus ID)9780791858608 (ISBN)
Conference
ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019; Phoenix; United States; 17 June 2019 through 21 June 2019
Note

QC 20200113

Available from: 2020-01-13 Created: 2020-01-13 Last updated: 2020-01-13Bibliographically approved
Kesseli, D., Wagner, M., Guédez, R. & Turchi, C. S. (2019). CSP-plant modeling guidelines and compliance of the system advisor model (SAM). In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems. Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), Article ID 170006.
Open this publication in new window or tab >>CSP-plant modeling guidelines and compliance of the system advisor model (SAM)
2019 (English)In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, American Institute of Physics (AIP), 2019, article id 170006Conference paper, Published paper (Refereed)
Abstract [en]

Accurately modeling risks, costs, and electricity output is essential to the financing and advancement of concentrating solar power projects. To address this need, a group of CSP experts created a guideline document, titled SolarPACES Guideline for Bankable STE Yield Assessment [1]. To make this information more accessible and allow stakeholders to test specific models against the recommendations, the guidelines have been condensed into a spreadsheet-based checklist. The checklist was applied to NREL's System Advisor Model (SAM) software, providing useful feedback to both the checklist group and the SAM development team. This study showed strong agreement between SAM and the guidelines, demonstrated the use of the guidelines in model validation, and resulted in several recommended improvements to SAM.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-262570 (URN)10.1063/1.5117676 (DOI)2-s2.0-85070577159 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191024

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2019-10-24Bibliographically approved
Trevisan, S., Guédez, R., Bouzekri, H. & Laumert, B. (2019). Initial design of a radial-flow high temperature thermal energy storage concept for air-driven CSP systems. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 200031.
Open this publication in new window or tab >>Initial design of a radial-flow high temperature thermal energy storage concept for air-driven CSP systems
2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, Vol. 2126, article id 200031Conference paper, Published paper (Refereed)
Abstract [en]

The present work deals with the initial design and performance evaluation of a novel thermal energy storage concept consisting of a packed bed of rocks with a radial gas flow, suitable for the a generation of air-driven concentrating solar power plants. In doing so, this article also presents a state of the art of most promising packed bed concepts, highlighting their advantages and disadvantages, all considered in the design of the new proposed system. A thermomechanical model of the concept was developed and used in simulations to assess its behavior during both charging and discharging processes, as well as to evaluate the influence of critical design parameters. This same model was used to compare the technical performance of the concept against that of more conventional packed-beds with axial-flow. Results show that the novel concept is able to outperform the other systems by enabling a theoretical reduction of 46% and 50% in radiation losses and pressure drops, respectively, thus calling for future investigations, including an in-depth thermos-mechanical study and life-cycle analysis of the concept prior to building a lab-scale prototype.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-262567 (URN)10.1063/1.5117746 (DOI)2-s2.0-85070627314 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Gan, P. G., Monnerie, N., Brendelberger, S., Roeb, M., Guédez, R., Laumert, B. & Sattler, C. (2019). Modeling, simulation and economic analysis of CSP-driven solar fuel plant for diesel and gasoline production. In: AIP Conference Proceedings: . Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), Article ID 180009.
Open this publication in new window or tab >>Modeling, simulation and economic analysis of CSP-driven solar fuel plant for diesel and gasoline production
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2019 (English)In: AIP Conference Proceedings, American Institute of Physics (AIP), 2019, article id 180009Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The present research focuses on modeling of solar thermal driven fuel production plant with CO2 and H2O as raw materials to produce synthetic gas (syngas) which is converted into hydrocarbons through Fischer-Tropsch process either with Fe and Co catalyst to produce diesel, gasoline and kerosene. The solar reactor uses cerium oxide (CeO2) as a metal-redox and operates at 1773 K and 1300 K for reduction and oxidation step respectively under non-stoichiometric condition. The plant is analyzed by performing a quasi-steady state simulation under boundary condition that the Fischer-Tropsch reactor should operate with the capacity factor of 0.95 or 8350 hours annually. A storage tank is used to store and regulate the flow of syngas going into the Fischer-Tropsch reactor. Sensitivity analysis is carried out, particularly on solar reactor conversion and solid-to-solid heat exchanger efficiency. Another sensitivity analysis is to combine PV and CSP as the external electricity source. The production cost is finally calculated using annuity method with constant discount rate.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-262564 (URN)10.1063/1.5117689 (DOI)2-s2.0-85070648587 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved
Trevisan, S., Guédez, R. & Laumert, B. (2019). Preliminary assessment of integration of a packed bed thermal energy storage in a Stirling - CSP system. In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems. Paper presented at 24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018. American Institute of Physics (AIP), 2126, Article ID 200032.
Open this publication in new window or tab >>Preliminary assessment of integration of a packed bed thermal energy storage in a Stirling - CSP system
2019 (English)In: SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, American Institute of Physics (AIP), 2019, Vol. 2126, article id 200032Conference paper, Published paper (Refereed)
Abstract [en]

The present work deals with the thermodynamic analysis of four different integration schemes for a packed bed thermal energy storage in a Stirling - CSP system. Simplified models for the different systems' configurations have been developed and analyzed in steady and transient working conditions. Particularly, a parallel and serial connection between the power and the storage unit have been compared, showing a trade-off between the contemporaneity of power production and storage and the usefulness of the storage itself accordingly to the working temperature constraints for the power unit. It is shown that a closed parallel system configuration is the most promising solution as it allows for a longer production during night time and an higher net energy production, it is therefore worth of further investigations.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2126
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-258139 (URN)10.1063/1.5117747 (DOI)2-s2.0-85070630739 (Scopus ID)9780735418660 (ISBN)
Conference
24th SolarPACES International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2018; Casablanca; Morocco; 2 October 2018 through 5 October 2018
Note

QC 20191007

Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-07Bibliographically approved
Trevisan, S., Guédez, R. & Laumert, B. (2019). Supercritical CO2 Brayton Power Cycle for CSP With Packed Bed TES Integration and Cost Benchmark Evaluation. In: Proceedings ASME 2019 Power Conference: . Paper presented at ASME 2019 Power Conference, July 15–18, 2019, Salt Lake City, Utah, USA. American Society of Mechanical Engineers (ASME)
Open this publication in new window or tab >>Supercritical CO2 Brayton Power Cycle for CSP With Packed Bed TES Integration and Cost Benchmark Evaluation
2019 (English)In: Proceedings ASME 2019 Power Conference, American Society of Mechanical Engineers (ASME) , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The present work introduces an indirect supercritical CO2 - air driven concentrated solar plant with a packed bed thermal energy storage. The proposed plant design enables a supercritical CO2 turbine inlet temperature of 800 degrees C, overcoming the temperature limits imposed by the use of solar molten salts as primary heat transfer fluid. Furthermore, the packed bed thermal energy storage permits the decoupling between thermal power collection from the sun and electricity generation. Besides, the thermal energy storage unit grants operational flexibility and enlarges the plant capacity factor, making it as available as a conventional coal facility. A transient thermodynamic model of the integrated concentrating solar plant, including receiver, thermal energy storage, intermediate heat exchangers and supercritical CO2 power cycle has been developed. This same model has been used to evaluate the thermodynamic performance of the proposed plant design over a complete year. A similar model has been implemented to simulate a supercritical CO2 plant driven by a more traditional solar molten salt loop. A comparison of the thermodynamic performance of the two plant designs has been performed. A complete economic model has been developed in order to evaluate the economic viability of the proposed plant. Furthermore, a multi-objective optimization have been executed in order to assess the influence of the thermal energy storage size, supercritical CO2 turbine inlet temperature and plant solar multiple on the key performance indicators. Results show that the proposed indirect supercritical CO2 air driven with a packed bed thermal energy storage concentrated solar plant leads to improved thermo-economic performance with respect to the molten salts driven design. Enhancements in the power cycle efficiency and in the overall electricity production can be achieved, with a consequent reduction in the levelized cost of electricity. Particularly, for a design net electrical power production of 10MWe a minimum levelized cost of electricity has been calculated at 89.4 $/MWh for a thermal energy storage capacity of 13.9 hours at full load and a plant solar multiple of 2.47 corresponding to a capital investment of about 73.4 M$.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME), 2019
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-269012 (URN)10.1115/POWER2019-1903 (DOI)000509610900026 ()2-s2.0-85076439511 (Scopus ID)978-0-7918-5910-0 (ISBN)
Conference
ASME 2019 Power Conference, July 15–18, 2019, Salt Lake City, Utah, USA
Note

QC 20200322

Available from: 2020-03-22 Created: 2020-03-22 Last updated: 2020-03-22Bibliographically approved
Payaro, A., Naik, A. A., Guédez, R. & Laumert, B. (2018). Identification of Required Cost Reductions for CSP to Retain Its Competitive Advantage as Most Economically Viable Solar-Dispatchable Technology. In: Mancilla, R Richter, C (Ed.), INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2017): . Paper presented at 23rd International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES), SEP 26-29, 2017, Santiago, CHILE. AMER INST PHYSICS, Article ID 040028-1.
Open this publication in new window or tab >>Identification of Required Cost Reductions for CSP to Retain Its Competitive Advantage as Most Economically Viable Solar-Dispatchable Technology
2018 (English)In: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2017) / [ed] Mancilla, R Richter, C, AMER INST PHYSICS , 2018, article id 040028-1Conference paper, Published paper (Refereed)
Abstract [en]

The present study evaluates and compares the optimum configurations for both PV-batteries and molten salt tower concentrating solar power plants that minimize the levelized cost of electricity for a suitable location for deployment of both solar technologies nearby Ouarzazate, Morocco, when considering two capacity factor objectives, namely 50% and 85%, and cost-projections for 2020 and 2030. Required target cost reduction rates for each of the main blocks in the tower plant (i.e. the solar field, the storage and the power block) are identified for guaranteeing its competitive advantage as the most economically viable solar-only technology at both capacity factor objectives investigated. It is shown that the larger the capacity factor requirement is, the more competitive the solar thermal technology would be. Specifically, the case-study shows that for an 85% capacity factor objective, tower plants would be more competitive even when considering the most pessimistic and optimistic cost projections for the solar thermal and PV-batteries sub-components, respectively. Nevertheless, it was also determined that in order to ensure being the most competitive solar-only technology at a 50% capacity factor objective by 2030, the costs of the solar field of the solar tower plants should reach values as low as 20-50 (sic)/m(2), depending on the scenario, which means approximately a three to seven fold decrease of the costs as of 2017. At last, recommendations to solar thermal technology owners and developers are provided, and a short discussion regarding the viability and limitations of using battery electric storage systems for utility-scale solar plants is presented.

Place, publisher, year, edition, pages
AMER INST PHYSICS, 2018
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2033
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-257839 (URN)10.1063/1.5067064 (DOI)000481681200055 ()2-s2.0-85057136481 (Scopus ID)978-0-7354-1757-1 (ISBN)
Conference
23rd International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES), SEP 26-29, 2017, Santiago, CHILE
Note

QC 20190905

Available from: 2019-09-05 Created: 2019-09-05 Last updated: 2019-10-21Bibliographically approved
Guédez, R., Garcia, J. A., Martin, F., Wiesenberg, R. & Laumert, B. (2018). Integrated Solar Combined Cycles vs Combined Gas Turbine to Bottoming Molten Salt Tower Plants - A Techno-economic Analysis. In: Mancilla, R Richter, C (Ed.), INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2017): . Paper presented at 23rd International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES), SEP 26-29, 2017, Santiago, CHILE. AMER INST PHYSICS, Article ID 180006-1.
Open this publication in new window or tab >>Integrated Solar Combined Cycles vs Combined Gas Turbine to Bottoming Molten Salt Tower Plants - A Techno-economic Analysis
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2018 (English)In: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2017) / [ed] Mancilla, R Richter, C, AMER INST PHYSICS , 2018, article id 180006-1Conference paper, Published paper (Refereed)
Abstract [en]

The present work deals with the techno-economic analysis of a novel combined power cycle consisting of a molten-salt solar tower power plant with storage supported by additional heat provided from the exhaust of a topping gas-turbine unit. A detailed model has been elaborated using in house simulation tools that simultaneously encompass meteorological, demand and required dispatch data. A range of possible designs are evaluated for a suitable location with both good solar resource and vast natural gas resources in order to show the trade-offs between the objectives of achieving low carbon-intensive and economically competitive designs. These were compared against more conventional integrated solar combined cycles of equivalent capacity factors. It is shown that the novel concept is worth further investigating as it is able to outperform the more conventional cycle while simultaneously offering additional flexibility to grid-operators.

Place, publisher, year, edition, pages
AMER INST PHYSICS, 2018
Series
AIP Conference Proceedings, ISSN 0094-243X ; 2033
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-257837 (URN)10.1063/1.5067178 (DOI)000481681200169 ()2-s2.0-85057129538 (Scopus ID)978-0-7354-1757-1 (ISBN)
Conference
23rd International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES), SEP 26-29, 2017, Santiago, CHILE
Note

QC 20190905

Available from: 2019-09-05 Created: 2019-09-05 Last updated: 2019-10-21Bibliographically approved
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