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Economic Potential of Solar Thermal Power Plants with Direct Steam Generation compared to HTF Plants

Feldhoff, Jan Fabian and Benitez, Daniel and Eck, Markus and Riffelmann, Klaus-Jürgen (2009) Economic Potential of Solar Thermal Power Plants with Direct Steam Generation compared to HTF Plants. In: ASME Energy Sustainability Conference, 2009. ASME 2009 3rd International Conference of Energy Sustainability, 19.-23. Juli 2009, San Fransisco, CA, USA.

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The direct steam generation (DSG) in parabolic trough collectors is a promising option to improve the mature parabolic trough solar thermal power plant technology of the Solar Energy Generating Systems (SEGS) in California. According to previous studies [1-3], the cost reduction of the DSG process compared to the SEGS technology is expected to be 8 to 25%. All these studies were more or less preliminary since they lacked detailed information on the design of collector fields, absorber tubes required for steam temperatures higher than 400°C and power blocks adapted to the specific needs of the direct steam generation. To bridge this gap, a detailed system analysis was performed within the German R&D project DIVA. Power blocks and collector fields were designed for four different capacities (5, 10, 50 and 100 MWel) and different live steam parameters. The live steam temperature was varied between saturation temperature and 500°C, and live steam pressures of 40, 64 and 100 bar were investigated. To assess the different cases, detailed yield analyses of the overall system were performed using hourly data for the direct normal irradiation and the ambient temperature for typical years. Based on these results the levelized costs of electricity were determined for all cases and compared to a reference system using synthetic oil as heat transfer fluid (HTF). This paper focuses on two main project findings. First, the 50 MWel DSG system parameter comparisons are presented. Second, the detailed comparison between a DSG and a SEGSlike 100 MWel system is given. The main result of the investigation is that the benefit of the DSG process depends on the project site and can reach an 11% reduction of the levelized electricity cost (LEC).

Item URL in elib:https://elib.dlr.de/60437/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Economic Potential of Solar Thermal Power Plants with Direct Steam Generation compared to HTF Plants
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Riffelmann, Klaus-JürgenFlagsol GmbHUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:ASME Energy Sustainability Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:direct steam generation, parabolic trough, electricity cost, system comparison, solar thermal power plant
Event Title:ASME 2009 3rd International Conference of Energy Sustainability
Event Location:San Fransisco, CA, USA
Event Type:international Conference
Event Dates:19.-23. Juli 2009
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Deposited By: Feldhoff, Dr.-Ing. Jan Fabian
Deposited On:04 Nov 2009 12:15
Last Modified:09 Feb 2017 19:18

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