| 1. |
- Strand, Torsten, et al.
(författare)
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On the Significance of Concentrated Solar Power R&D in Sweden
- 2011
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Ingår i: Proceedings of the World Renewable Energy Congress 2011, Linköping.
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Konferensbidrag (refereegranskat)abstract
- Concentrated Solar Power (CSP) is an emerging renewable energy technology that has the potential to provide a major part of European energy needs at competitive cost levels. Swedish industry is strongly involved in CSP-based energy production either in the form of growing providers on the European energy market or as developers and producers of key components for CSP power plants. The growing industrial interest is reflected and accompanied by state of the art research in this field at the Department of Energy Technology at KTH. In the present paper the main challenges and opportunities for CSP R&D are presented and linked to the industrial environment and interests in Sweden. Related to these challenges, an overview of the latest research activities and results at the Department of Energy Technology is given with examples concerning CSP plant operation and optimisation, techno- economic cycle studies and high temperature solar receiver development.
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| 2. |
- Ghaem Sigarchian, Sara, et al.
(författare)
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Modeling and Analysis of a Hybrid Solar-Dish Brayton Engine
- 2012
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Ingår i: Proceedings of the International SolarPACES Conference 2012.
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Konferensbidrag (refereegranskat)abstract
- Small-scale recuperated gas turbines with a highly efficient recuperator would appear to have considerable potential to be used in solar/fossil-fuel hybrid dish systems. The hybrid solar gas turbine can be configured in several different fashions, with the key difference being the relative positions of the solar receiver and burner as well as the operation mode of the burner.Steady state and transient models have been implemented in Engineering Equation Solver and the performance of various configurations are studied and compared. Layouts in which the receiver is located before the turbine (pressurized receivers) demonstrate higher performance compared to the one in which the receiver is located after the turbine (atmospheric receivers). The variation in operation throughout the year is taken into account and the performance of the system analyzed for two different cities (Yechang in China and Bechar in Algeria, with low and high solar insolation respectively). The integration of a solar receiver into a micro gas turbine reduces the yearly fuel consumption by around 15-16% in Yechang and up to 40% in Bechar. This will result in reductions of CO2 emissions as well as leading to lower daily operating costs. The hybrid nature of the Dish-Brayton system guarantees availability of the engine to meet the electricity demand whenever it occurs, allowing the system to supply dispatchable power.
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| 3. |
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| 4. |
- Ragnolo, Gianmarco, et al.
(författare)
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Technoeconomic Design of a Micro Gas-Turbine for a Solar Dish System
- 2014
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Ingår i: Proceedings of the International SolarPACES Conference 2014. Beijing, China. September 16-19. - : Elsevier.
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Konferensbidrag (refereegranskat)abstract
- An integrated approach for the design of a custom-tailored hybrid solar MGT with an integrated solar receiver for the use in a small-scale solar dish unit is presented in order to overcome the inherent limitations of adapting a MGT in the desired power range to solar operation. The resulting MGT-dish equipped with the ‘optimal’ MGT shows a nominal conversion efficiency of 29.6%. Then, a thermoeconomic analysis of the entire system is performed to evaluate and compare the economic and environmental performance of the MGT-dish with a Dish-Stirling system. From an economical point of view the MGT-dish outperforms the dish-Stirling with LCoEs as low as 15.3€cts/kWhel compared to 22.4€cts/kWhel.
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| 5. |
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| 6. |
- Strand, Torsten, et al.
(författare)
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An Innovative Hybrid Solar Gas-Turbine Power Plant based on the TopCycle Concept
- 2012
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Ingår i: Proceedings of the International SolarPACES Conference 2012, Marrakesh.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The TopCycle is an innovative gas-turbine power plant, in which a supercharger unit is added to a conventional industrial gas-turbine to boost the pressure ratio, and large amounts of steam are injected into the combustion chamber in order to achieve near- stoichiometric combustion. A thermoeconomic simulation model of a hybrid solar version of such a power plant has been developed, allowing determination of its thermodynamic and economic performance, and the results are compared with a more conventional hybrid solar combined cycle power plant. The analysis has shown that a hybrid solar TopCycle power plant can produce electricity with CO2 emissions below 300 kgCO2/MWhe at levelized costs around 60 – 80 €/MWhe, lower than the competing hybrid combined cycle units, and directly competitive with wind power.
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| 7. |
- Wang, Wujun, 1984-, et al.
(författare)
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An inverse design method for a cavity receiver used in solar dish Brayton system
- 2014
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Ingår i: Solar Energy. - : Elsevier. - 0038-092X .- 1471-1257. ; 110, s. 745-755
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Tidskriftsartikel (refereegranskat)abstract
- An inverse design method is developed in order to quickly find possible cavity receiver designs with relative uniform cavity wall surface temperature for a solar dish cavity receiver. In this design method, a heat transfer model of the absorber wall is used for analyzing the main heat transfer process between the cavity wall outer surface, the inner surface and the working fluid. Furthermore, a ray-tracing model based on the parameters of a real dish is utilized for obtaining the solar radiative boundary conditions for the heat transfer model. Impinging jet cooling technology is introduced due to its high heat transfer coefficient in the stagnation area, which can be used for cooling the peak flux on the cavity wall. After applying a well-designed impinging system, the temperature peak on the peak flux region in traditional receiver designs can be mitigated without introducing any over pressure drop problem.
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| 8. |
- Wang, Wujun, 1984-, et al.
(författare)
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Integrated Design of a Hybrid Gas Turbine-Receiver Unit for a Solar Dish System
- 2014
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Ingår i: Proceedings of the International SolarPACES Conference 2014. Beijing, China. September 16-19, 2014. - : Elsevier BV.
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Konferensbidrag (refereegranskat)abstract
- An integrated design concept of a 25 KWel hybrid gas turbine-receiver unit is introduced in this paper. In this design, hot section; receiver, combustor and turbine, is integrated and located in the center of the unit in order to achieve a compact structure with low heat loss and cooling requirement. A ray tracing model is developed for analyzing the focal plane of the potential parabolic dish design and predicting the radiative flux boundary conditions of the receiver. An impinging cavity receiver, with a cylindrical absorber wall and a semi-spherical bottom, is chosen as the receiver for this hybrid unit. The cooling capacities of different impinging arrangements are calculated to determine the thermal boundary conditions on the cooling side. Finally, the optimal dimensions of the receiver are chosen as well as the impingement cooling design. A ‘single ring’ impinging array was found to be optimal for cooling down the wall temperature of the peak flux region to 1200 °C and provide a receiver exit temperature of 840 °C.
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