The Experts below are selected from a list of 8013 Experts worldwide ranked by ideXlab platform
Till Doerbeck - One of the best experts on this subject based on the ideXlab platform.
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high temperature thermal storage system for Solar Tower power plants with open volumetric air receiver simulation and energy balancing of a discretized model
Energy Procedia, 2014Co-Authors: Valentina Kronhardt, Spiros Alexopoulos, Joost Sattler, M Reisel, Matthias Hanel, Bernhard Hoffschmidt, Till DoerbeckAbstract:Abstract This paper describes the modeling of a high-temperature storage system for an existing Solar Tower power plant with open volumetric receiver technology, which uses air as heat transfer medium (HTF). The storage system model has been developed in the simulation environment Matlab/Simulink ® . The storage type under investigation is a packed bed thermal energy storage system which has the characteristics of a regenerator. Thermal energy can be stored and discharged as required via the HTF air. The air mass flow distribution is controlled by valves, and the mass flow by two blowers. The thermal storage operation strategy has a direct and significant impact on the energetic and economic efficiency of the Solar Tower power plants.
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transient simulation for hybrid Solar Tower power plant with open volumetric receiver in algeria
2012Co-Authors: Spiros Alexopoulos, Gerrit Koll, Gisbert Breitbach, Till Doerbeck, Bernhard Hoffschmidt, Tahar SahraouiAbstract:This work describes the procedure of transient simulation for a Solar Tower power plant with open-volumetric receiver for a site in Northern Algeria. The simulation models have been developed in the simulation environment MATLAB/Simulink. Basic design calculations have been conducted on basis of meteorological data provided by satellites to investigate different concepts. For the concept that is most auspicious a transient annual simulation using local measured meteorological data has been conducted to yield detailed and accurate results.
Bjorn Laumert - One of the best experts on this subject based on the ideXlab platform.
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techno economic performance evaluation of direct steam generation Solar Tower plants with thermal energy storage systems based on high temperature concrete and encapsulated phase change materials
21st International Conference on Concentrating Solar Power and Chemical Energy Systems (SolarPACES) OCT 13-16 2015 Cape Town SOUTH AFRICA, 2016Co-Authors: Rafael Guedez, Monika Topel, Zhor Hassar, Monica Arnaudo, Roberto Zanino, Bjorn LaumertAbstract:Nowadays, direct steam generation concentrated Solar Tower plants suffer from the absence of a cost-effective thermal energy storage integration. In this study, the prefeasibility of a combined sen ...
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A Methodology for Determining Optimum Solar Tower Plant Configurations and Operating Strategies to Maximize Profits Based on Hourly Electricity Market Prices and Tariffs
Journal of Solar Energy Engineering, 2016Co-Authors: Rafael Guedez, Monika Topel, James Spelling, Inés Conde, Francisco Ferragut, Irene Callaba, Zhor Hassar, Carlos D. Perez-segarra, Bjorn LaumertAbstract:The present study analyzes the influence that market conditions have on determining optimum molten salt Solar Tower plants with storage that maximizes profits (in terms of plant configuration, sizi ...
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enhancing the profitability of Solar Tower power plants through thermoeconomic analysis based on multi objective optimization
Energy Procedia, 2015Co-Authors: Rafael Guedez, Monika Topel, James Spelling, Bjorn LaumertAbstract:Solar Tower power plants with integrated thermal energy storage units represent one of the most promising technologies for enhancing the economic viability of concentrating Solar power in the short ...
Hongfei Zheng - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of an idealised Solar Tower thermal power plant
Applied Thermal Engineering, 2015Co-Authors: Hongfei Zheng, Xu Yu, Yuehong Su, S B Riffat, Jianyin XiongAbstract:Abstract In the real Solar Tower thermal power system, it is widely acknowledged that the thermodynamic irreversibility, such as convective and radiative loss on Tower receiver, and thermal resistance in heat exchangers, is unavoidable. With above factors in mind, this paper presents an ideal model of the Solar Tower thermal power system to analyze the influence of various parameters on thermal and exergy conversion efficiencies, including receiver working temperature, concentration ratio, endoreversible heat engine efficiency and so forth. And therefore the variation of maximum thermal conversion efficiency in terms of concentration ratio and endoreversible heat engine efficiency could be theoretically obtained. The results indicate that raising the receiver working temperature could initially increase both thermal and exergy conversion efficiencies until an optimum temperature is reached. The optimum temperature would also increase with the concentration ratio. Additionally, the concentration ratio has a positive effect on the thermal conversion efficiency: increasing the concentration ratio could raise the conversion efficiency until the concentration ratio is extremely high, after which there will be a slow drop. Lastly, the endoreversible engine efficiency also has significant influence on the thermal conversion efficiency, it will increase the thermal conversion efficiency until it reaches the maximum and optimum value, and then the conversion efficiency will drop dramatically.
Valentina Kronhardt - One of the best experts on this subject based on the ideXlab platform.
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high temperature thermal storage system for Solar Tower power plants with open volumetric air receiver simulation and energy balancing of a discretized model
Energy Procedia, 2014Co-Authors: Valentina Kronhardt, Spiros Alexopoulos, Joost Sattler, M Reisel, Matthias Hanel, Bernhard Hoffschmidt, Till DoerbeckAbstract:Abstract This paper describes the modeling of a high-temperature storage system for an existing Solar Tower power plant with open volumetric receiver technology, which uses air as heat transfer medium (HTF). The storage system model has been developed in the simulation environment Matlab/Simulink ® . The storage type under investigation is a packed bed thermal energy storage system which has the characteristics of a regenerator. Thermal energy can be stored and discharged as required via the HTF air. The air mass flow distribution is controlled by valves, and the mass flow by two blowers. The thermal storage operation strategy has a direct and significant impact on the energetic and economic efficiency of the Solar Tower power plants.
Yongping Yang - One of the best experts on this subject based on the ideXlab platform.
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Techno-Economic Analysis of Solar Tower Aided Coal-Fired Power Generation System
Energies, 2017Co-Authors: Rongrong Zhai, Yongping Yang, M.a. Reyes-belmonteAbstract:In this paper, we conduct a techno-economic analysis of a 1000 MWe Solar Tower aided coal-fired power generation system for the whole life cycle. Firstly, the power output (from coal and Solar thermal energy) under variable direct normal irradiance and grid demand are studied. Secondly, a financial assessment is performed, including profits and losses of the plant project. Thirdly, sensitivity analysis is taken on some external factors that can affect the cost or profits and losses of the plant project. The results indicate that the project has high profits with an internal rate of return (IRR) of 8.7%. In addition, the effects of Solar Tower field cost, power purchase agreement (PPA) price of Solar thermal electricity, coal price, and the interest rate of debt on the main criteria decrease gradually. Therefore, it is better to improve Solar Tower technology first, and then look for low-interest debts from banks to cope with the reduction of PPA price of Solar thermal electricity and the increase of coal price. Despite the introduction of Solar Tower field increasing levelized cost of electricity (LCOE), it contributes to the reduction of CO2 capture cost compared to the case of standard coal-fired power plants.
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annual performance of Solar Tower aided coal fired power generation system
Energy, 2017Co-Authors: Rongrong Zhai, Yongping Yang, Jiawei Qi, M A Reyesbelmonte, Manuel RomeroAbstract:Solar Tower aided coal-fired power generation system (STCG) is able to provide high Solar utilization efficiency with low coal consumption rate. This paper compares performances of a Solar Tower aided coal-fired power plant, a Solar Tower power plant and a coal-fired power plant under different operative conditions. The comparison includes various Solar multiple and thermal energy storage size. According to Solar radiation resource and grid power dispatching demand, STCG, Solar Tower power generation system (STG) and coal-fired power generation system (CPG) work under off-design conditions all the year around. Results show that STCG has higher Solar utilization efficiency than STG and lower coal consumption rate and CO2 emission rate than CPG. In addition, Solar-to-electricity exergy efficiency of STCG is at least 1.83% higher than that of STG. Compared to CPG, the 1000 MWe STCG can reduce coal consumption by 2.0 × 105 t/y, with the saving ratio being 10.4%. The annual average coal consumption rate of STCG is 27.3 g/kWh lower than that of CPG. In addition, the annual average CO2 emission rate of STCG is reduced by 10.1% compared with that of CPG. Solar Tower aided coal-fired power generation can facilitate energy conservation and emission reduction of STG and CPG.
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exergy destruction analysis of Solar Tower aided coal fired power generation system using exergy and advanced exergetic methods
Applied Thermal Engineering, 2016Co-Authors: Rongrong Zhai, Hao Peng, Yongping YangAbstract:Abstract The Solar Tower aided coal-fired power generation system (STCG) is based on a Solar Tower field and a conventional coal-fired power plant. Solar thermal energy is used to generate high-temperature and pressure steam to work in the coal-fired power plant. Indirect Solar power generation and coal energy conservation goals can be achieved under this arrangement. The paper conducts a conventional and an advanced exergetic analysis of a 1000 MWe STCG. Exergy distribution of the system, exergy efficiency of each component and exergy destruction construction have been analyzed. Conventional exergetic analysis method has been used for exergy flow and loss distribution of STCG, whereas the advanced exergetic analysis method has been applied to exergy destruction of components, including endogenous and exogenous exergy destruction. These two methods complement each other and reveal the causes of exergy destruction in STCG. Results indicate that boiler and Solar Tower field systems are the components with the lowest exergy efficiency (53.5% and 26.0%, respectively). Total exergy losses of these two components account for more than 85% of all exergy losses of STCG. Exergy destruction of components is caused mainly by thermal performance of these components. Based on the degree of system and component association, the component ratio of endogenous and exogenous exergy destruction is different. Exogenous exergy destruction is directly proportional to the association degree. Connection complexity between a Solar Tower field and a coal-fired power plant system is the simplest, and 99.9% of Solar Tower exergy destruction is produced by the Solar Tower field itself. The results of this paper indicate that the boiler and Solar Tower field should be analyzed in detail when designing STCG systems. Before optimizing the system integration, thermal performance of components should be improved. Doing so, more energy from Solar and coal can be converted to electricity, guiding the design and optimization of real demonstrators.
