| 1. |
- Pihl, Erik, 1981, et al.
(författare)
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THERMOECONOMIC OPTIMISATION OF SOLAR HYBRIDISATION OPTIONS FOR EXISTING COMBINED-CYCLE POWER PLANTS
- 2011
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Ingår i: IEA SolarPACES 2011.
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Konferensbidrag (refereegranskat)abstract
- A model of an integrated solar combined cycle power plant has been developed in order to examine the performance of a combined-cycle plant when retrofitted with solar collectors. The model was then used for multi-objective thermo-economic optimisation of both the power plant performance and cost, using a population-based algorithm. In order to examine the trade-offs that must be made and identify ‘optimal’ hybridisation schemes and operating conditions, two conflicting objectives will be considered, namely minimum investment costs and maximum annual solar share. It was found that only small annual solar shares (~1%) can be achieved during retrofitting, but that the cost of the additional solar-generated electricity is comparably low, with equivalent levelised electricity costs of ≤10 c€/kWh.
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| 2. |
- Spelling, James, 1987-, et al.
(författare)
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A Thermoeconomic Study of Hybrid Solar Gas-Turbine Power Plants
- 2011
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Ingår i: Proceedings of the International SolarPACES Conference 2011, Granada.
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Konferensbidrag (refereegranskat)abstract
- A dynamic simulation model of a hybrid solar gas-turbine power plant has been developed, allowing determination of its thermodynamic and economic performance. Designs were based around two representative gas-turbines: a high efficiency machine and a low temperature machine. In order to examine the trade-offs that must be made, multi-objective thermo-economic analysis was performed, with two conflicting objectives: minimum investment costs and minimum specific CO2 emissions. At current fuel prices, gas-turbine solarisation was shown to result in only a small increase in levelised electricity costs at moderate solar shares. In the future, with higher fuel prices and carbon taxes, it was shown that electricity from hybrid solar gas-turbines could be cheaper than from fossil-only gas-turbines.
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| 3. |
- Spelling, James, 1987-, et al.
(författare)
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A Thermoeconomic Study of Low-Temperature Intercooled-Recuperated Cycles for Pure-Solar Gas-Turbine Applications
- 2011
-
Ingår i: Proceedings of the International SolarPACES Conference 2011, Granada.
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Konferensbidrag (refereegranskat)abstract
- A dynamic model of a megawatt-scale low-temperature intercooled-recuperated solar gas-turbine power plant has been developed in order to allow determination of the thermodynamic and economic performance. The model was then used for multi-objective thermo-economic optimisation of both the power plant performance and cost, using a population-based algorithm. In order to examine the trade-offs that must be made and identify ‘optimal’ plant sizes and operating conditions, two conflicting objectives were considered, namely minimum investment costs and maximum annual electricity production. Levelised electricity costs from a 50 – 60 MWe power plant are predicted to be below 150 USD/MWhe, competitive with other solar thermal power technologies, and optimal plant sizes and configurations have been identified.
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| 4. |
- Spelling, James, 1987-
(författare)
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Steam Turbine Optimisation for Solar Thermal Power Plant Operation
- 2011
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The provision of a sustainable energy supply is one of the most important issues facing humanity at the current time, given the strong dependence of social and economic prosperity on the availability of affordable energy and the growing environmental concerns about its production. Solar thermal power has established itself as a viable source of renewable power, capable of generating electricity at some of the most economically attractive rates. Solar thermal power plants are based largely on conventional Rankine-cycle power generation equipment, reducing the technological risk involved in the initial investment. Nevertheless, due to the variable nature of the solar supply, this equipment is subjected to a greater range of operating conditions than would be the case in conventional systems. The necessity of maintaining the operational life of the steam-turbines places limits on the speed at which they can be started once the solar supply becomes available. However, in order to harvest as much as possible of the Sun’s energy, the turbines should be started as quickly as is possible. The limiting factor in start-up speed being the temperature of the metal within the turbines before start-up, methods have been studied to keep the turbines as warm as possible during idle-periods. A detailed model of the steam-turbines in a solar thermal power plant has been elaborated and validated against experimental data from an existing power plant. A dynamic system model of the remainder of the plant has also been developed in order to provide input to the steam-turbine model. Three modifications that could potentially maintain the internal temperature of the steam-turbines have been analysed: installation of additional insulation, increasing the temperature of the gland steam and use of external heating blankets. A combination of heat blankets and gland steam temperature increase was shown to be the most effective, with increases in electricity production of up to 3% predicted on an annual basis through increased availability of the solar power plant.
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| 5. |
- 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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