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Techno-economic analysis of a solar thermal retrofit for an air-cooled geothermal Organic Rankine Cycle power plant

Title data

Heberle, Florian ; Hofer, Markus ; Ürlings, Nicolas ; Schröder, Hartwig ; Anderlohr, Thomas ; Brüggemann, Dieter:
Techno-economic analysis of a solar thermal retrofit for an air-cooled geothermal Organic Rankine Cycle power plant.
In: Renewable Energy. Vol. 113 (1 December 2017) . - pp. 494-502.
ISSN 1879-0682
DOI: https://doi.org/10.1016/j.renene.2017.06.031

Project information

Project financing: Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst

Abstract in another language

High ambient temperatures are often coupled with high levels of solar irradiation and lead to a significant reduction of the power output of air-cooled geothermal Organic Rankine Cycle (ORC) power plants. Consequently, hybridisation based on solar thermal power is promising. In this work, a solar thermal retrofit based on superheating of the ORC working fluid is analysed under technical and economic criteria considering typical conditions in Turkey. The conducted off-design simulations prove that the isentropic efficiency of the turbine has a major impact on the performance of the entire system. The solar field size and the corresponding degree of superheating is limited in the respect to the built-in components. Therefore, the thermal stability of the examined ORC working fluid is sufficient and a low-temperature parabolic trough field with water as heat transfer fluid can be realized. For the retrofit, detailed simulations over the period of one year show up to 7.8% more electricity, a solar-to-electric efficiency of 10% and a significant power gain during summer. Besides, an increased reinjection temperature could lead to an improved management of the geothermal reservoir. Economically, the medium sized solar field is related to the lowest levelised costs of electricity (LCOE) with 145 $/MWh.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Organic Rankine Cycle; Retrofit; Geothermal energy; Solar energy; Parabolic trough collectors
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 15 Mar 2019 07:34
Last Modified: 15 Mar 2019 07:34
URI: https://eref.uni-bayreuth.de/id/eprint/47287