The aim of this paper is to identify a complete storage concept for solar thermal power plants with direct steam
generation that pays special attention to the temperature dependence of the steams specific heat capacity and at the
same time allows a maximum live steam temperature during discharging. For this study, a PCM-storage using
sodium nitrate was chosen for the evaporation/condensation section of the storage system and a molten salt system
for the sensible section. Four concepts have been identified and presented that fulfill the mentioned requirements.
In this paper the design point of the system is considered only. This is acceptable for this early stage of the
investigation to identify suitable solutions. Based on the preliminary analysis performed, it is not possible to perform
a final ranking of the different solutions. The approaches differ in complexity, efficiency reduction during
discharging and required storage capacities. Thus, a final assessment requires the estimation of the according
investment costs and the determination of the electricity yield for representative sites. The determination of the yield
has to consider plant operation for at least one year to consider all seasonal variations of the irradiance and thus the
according part load characteristic of the solar thermal power plant including storage
Despite the tentativeness of the presented study, it is already shown, that storage concepts are available for DSG
solar thermal power plants that consider the unfavorable specific heat characteristic of superheated steam and at the
same time allow a maximized molten salt temperature in the hot storage tank and thus a maximized live steam
temperature during discharging
The aim of this paper is to identify a complete storage concept for solar thermal power plants with direct steamgeneration that pays special attention to the temperature dependence of the steams specific heat capacity and at thesame time allows a maximum live steam temperature during discharging. For this study, a PCM-storage usingsodium nitrate was chosen for the evaporation/condensation section of the storage system and a molten salt systemfor the sensible section. Four concepts have been identified and presented that fulfill the mentioned requirements.In this paper the design point of the system is considered only. This is acceptable for this early stage of theinvestigation to identify suitable solutions. Based on the preliminary analysis performed, it is not possible to performa final ranking of the different solutions. The approaches differ in complexity, efficiency reduction duringdischarging and required storage capacities. Thus, a final assessment requires the estimation of the accordinginvestment costs and the determination of the electricity yield for representative sites. The determination of the yieldhas to consider plant operation for at least one year to consider all seasonal variations of the irradiance and thus theaccording part load characteristic of the solar thermal power plant including storageDespite the tentativeness of the presented study, it is already shown, that storage concepts are available for DSGsolar thermal power plants that consider the unfavorable specific heat characteristic of superheated steam and at thesame time allow a maximized molten salt temperature in the hot storage tank and thus a maximized live steamtemperature during discharging
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