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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Systems approach to concentrated solar power (CSP) technology adoption in South Africa
摘要： To meet its future energy demand, the government of South Africa set up an Integrated Resource Plan (IRP) with the primary objective of determining its long-term electricity demand, and indicating how this demand should be met, in terms of generation type and timing. The IRP in 2010 presented the favoured energy generation techniques in SA, and it allocated 17 800 MW (42%) of the total energy mix in 2030 to renewable energy technologies (RETs). To achieve this target, the Renewable Energy Independent Power Producer Procurement Programme (REI4P) was launched and wind, solar photovoltaic (PV) and concentrating solar power (CSP) have been favoured mostly in the bids rolled out thus far. South Africa has been identified as one of the world’s best destinations for CSP because of the available solar resources, and a total of 600 MW of CSP had been purchased in the REIPPPP bids. However, the IRP update of 2016 threw CSP out of the future energy plans, when it gave no share to new electricity generation from it beyond 2030. This has created growing uncertainty of the future of CSP in South Africa. There is therefore an urgent need for collective efforts to present a broad and detailed value proposition in terms of present and prospects of CSP, and how it can be developed and deployed in the country to foster a lower tariff, encourage adoption, and ensure its return to the IRP. The study presented in this paper used a system dynamics approach to analyse the unique, critical and complex factors that affect the deployment of CSP in South Africa, as identified by concerned policy-makers, CSP experts, and existing studies. The result from this study shows that improved support for research is the most effective way to open new methods and ways in which the CSP technologies can be deployed, which will foster further CSP adoption in South Africa.
关键词： Renewable Energy Technologies (RETs),Integrated Resource Plan (IRP),South Africa,System Dynamics,Concentrated Solar Power (CSP)
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore, India (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Design. Performance Analysis and Optimization of a 100 MW Concentrated Solar Power Plant with Thermal Energy Storage
摘要： The energy demand of the middle east region is on the rise with an urgent need to tap the abundant renewable energy sources in the region.This is essential for the future development of the Middle- East region as it reduces the dependency on fossil fuels and eliminates the problems associated with air pollution and greenhouse gases. This paper presents the design, performance analysis and optimization of a 100 MWe parabolic trough based Concentrated Solar Power Plant with thermal energy storage for a location in Abudhabi which falls in middle east region. The thermodynamic aspect and annual performance of the proposed plant design is also analyzed using the SAM software.The annual energy generated from the CSP plant is found to be 333.15GWh with a gross to net conversion factor of 81.1%.The mean efficiency of the plant is found to be 14.35%. The performance of the proposed CSP plant is further optimized by varying the solar multiple and full load hours of TES. The proposed parabolic trough based CSP plant with thermal energy storage is found to be feasible for the location further in Abudhabi and encourages development of solar thermal power plants in the region.
关键词： optimization,Renewable energy,thermal energy storage,parabolic trough,Concentrated Solar Power
更新于2025-09-09 09:28:46
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SiC-TiC nanocomposite for bulk solar absorbers applications: Effect of density and surface roughness on the optical properties
摘要： In this study, the potential of SiC-TiC nano-composites as solar absorbers has been studied. For solar thermal applications, materials with high solar absorptance and low emittance are ideally sought for (spectral selectivity). A semi-molecular sol-gel synthesis route leading to nanometric homogenous composites was described. The resulting SiC-TiC nanocomposite powder was sintered at different temperatures to produce samples with various relative densities (from 57% to 96%). The samples morphology and composition were characterized by several techniques including Scanning Electron Microscopy (SEM), Energy-Dispersive X-Ray Spectroscopy (EDX), X-Ray Diffraction (XRD), carbon and oxygen elemental analyses. The link between the surface roughness and the relative density was precised and the effects on the optical properties (0.25–25 μm wavelength range) were studied. Comparisons were made with pure SiC and pure TiC samples with various relative densities. Overall, the sample emittance was found to strongly decrease with the increase in the relative density, leading to a great increase in the spectral selectivity, despite a little decrease in the solar absorptance. The TiC-SiC composite has an intermediate reflectance compared to the pure SiC and the pure TiC samples. With an absorptance of 0.76, an emittance of 0.44 and a selectivity of 1.74, the denser SiC-TiC could be a good candidate for bulk solar applications.
关键词： Concentrated Solar Power,TiC,Selectivity,Density,SiC,Roughness
更新于2025-09-09 09:28:46
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Dynamic simulation, control, and performance evaluation of a synergistic solar and natural gas hybrid power plant
摘要： Solar power is considered among the leading renewable energy technologies. Abundant supply, flexibility of installation, and decreasing cost makes it an interesting renewable energy resource. However, there are challenges associated with the reliability of solar power due to its intermittent nature. This work demonstrates the synergies that exist in integrated hybrid systems, where a dispatchable fuel is used in conjunction with concentrated solar power. In this simulation-based study, a parabolic trough solar concentrator is used to collect solar energy. The heat collected from the solar field is used to generate steam in a Rankine cycle. The system also utilizes natural gas combustion in the steam generator to provide supplemental steam when the solar intensity is reduced due to cloud cover or at night. Natural gas is also used for superheating the steam, which allows the system to produce higher temperatures and achieve increased thermodynamic cycle efficiencies. This flexible design produces 100 MW at nominal conditions, while it is capable of producing a maximum of 140 MW when sufficient solar energy is available. The novel contributions of this work include a complete, systems-level, dynamic model of a hybrid solar plant. The model is complete with a control system that smoothly transitions the plant from pure natural gas mode at night to solar hybrid mode during the day. It evaluates innovative design features such as flexible fuel operation, steam superheating to boost efficiency, and preheating by solar or waste heat. Furthermore, this work demonstrates that by hybridizing a solar system with a dispatchable energy source, both the reliability and efficiency of the solar power production are increased. The annual solar-to-electric efficiency increases from 15.2% to 26.13% with hybridization, which indicates that utilization of the solar energy is effectively increased.
关键词： Natural gas plant,Hybrid system,Dynamic simulation and control,Concentrated solar power
更新于2025-09-09 09:28:46
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[ASME ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum - Charlotte, North Carolina, USA (Monday 26 June 2017)] Volume 2: I&C, Digital Controls, and Influence of Human Factors; Plant Construction Issues and Supply Chain Management; Plant Operations, Maintenance, Aging Management, Reliability and Performance; Renewable Energy Systems: Solar, Wind, Hydro and Geothermal; Risk Management, Safety and Cyber Security; Steam Turbine-Generators, Electric Generators, Transformers, Switchgear, and Electric BOP and Auxiliaries; Student Competition; Thermal Hydraulics and Computational Fluid Dynamics - Heat Transfer Performance of LiF–NaF–KF Salt in a Corrugated Receiver Tube With Non-Uniform Solar Flux
摘要： The heat flux on the receiver tube is non-uniform because of uneven solar flux and receiver structure, which causes overheating and thermal stress failure of receiver and affected safe operations of the Concentrated Solar Power(CSP) system. In order to reduce the temperature difference in receiver tube wall and improve the efficiency of CSP system, the ternary eutectic salt LiF–NaF–KF (46.5–11.5–42 wt.%, hereafter FLiNaK), which has a better high thermal stability than that of nitrate salts at operating temperature of 900 °C, is selected as HTF, and heat transfer performance of FLiNaK in a corrugated receive tube with non-uniform heat flux is simulated by CFD software in the present work. The numerical results reveal that the non-uniform heat flux has a great influence on the temperature distributions of the receive tube and FLiNaK salt. Compared with the result of bare tube, the corrugated tube can not only significantly reduce the temperature difference in tube wall and salt by improving the uniformity of temperature distribution but also enhance the heat transfer of the salt, where the heat transfer coefficient increases with the Reynolds number and heat flux. Moreover, the enhanced effect of the corrugated tube depends on both the pitch and the height of ridges. It is found that the heat transfer coefficient of the salt gets a maximum when the ratio of the height of ridge to the pitch is 0.2. The research presented here may provide guidelines for design optimization of receiver tube in CSP system.
关键词： heat transfer,FLiNaK,non-uniform heat flux,corrugated tube,Concentrated Solar Power
更新于2025-09-04 15:30:14