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thesis_HELLER_Lukas_20120721 muy bueno y completo LCOE.pdf

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Faculty of Mechanical Engineering Institute of Power Engineering Diplomarbeit INVESTIGATION OF THE THERMAL STORAGE SYSTEM FOR A 5 MW EL CONCENTRATED SOLAR POWER (CSP) PILOT PLANT Lukas Heller Mat.-Nr.: 3528245 Supervised by: Paul Gauché - Solar Thermal Energy Research Group (STERG), Stellenbosch University and: Stephan Heide - Institute of Power Engineering, TU Dresden Submitted on 11.04.2012 - Revised Version of 21.07.2012 ABSTRACT The use of thermal energy storages is seen to greatly improv
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  Faculty of Mechanical Engineering  Institute of Power Engineering Diplomarbeit INVESTIGATION OF THE THERMALSTORAGE SYSTEM FOR A 5 MW EL CONCENTRATED SOLAR POWER (CSP)PILOT PLANT Lukas Heller Mat.-Nr.: 3528245 Supervised by: Paul Gauché - Solar Thermal Energy Research Group (STERG),Stellenbosch University and: Stephan Heide - Institute of Power Engineering, TU Dresden Submitted on 11.04.2012 - Revised Version of 21.07.2012  ABSTRACT The use of thermal energy storages is seen to greatly improve the financial and energeticbenefits of a CSP power plant. In order to use the storage system effectively its type, design anddimensions have to meet the requirements of the plant. In this study, the modeling of a thermalenergy storage and the attached plant is developed and a sensitivity analysis is executed.A packed bed of rocks with air as the HTF was chosen as a very low cost solution for the storageof a combined cycle power plant. Correlations for heat transfer, destratification, pressure dropand heat losses from the literature have been analyzed and eventually a one-dimensional modelwas build. This was then validated against experimental data from several studies withsatisfactory overall outcome. A simplified plant control, following the proposed SUNSPOT cycle,has been implemented into the model and simulations were run to find major sensitivities to thestorage’s geometry, particle size and plant layout.The found optimum dimensions of the storage are a diameter of 19 m, a height of 12 m, aparticle size of 4 cm and gas and steam turbines with nominal ratings of 5.0 and 3.5 MW el  ,respectively. The calculated levelized cost of electricity reached a value of approximately1.12 ZAR/kWh which is as expected for a plant of this size.Further work has to be done on new plant control mechanisms, a more reliable cost calculationand a mechanically detailed design. I  II
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