SCARABEUS papers presented at the 5th European Conference on Supercritical Carbon Dioxide Energy Systems now available for download

The 5th European Conference on Supercritical Carbon Dioxide Energy Systems was held in Prague (Czech Republic) on the 15th and 16th of March, 2023. The conference was very well organised by Prof. Dostal (Czech Technical University in Prague, Czech Republic) and Prof. Brillert (Technical University of Duisburg-Essen, Germany).

The excellent scientific programme was comprised of scientific and industrial presentations, combined with interesting keynotes and panel sessions. The SCARABEUS consortium contributed two excellent papers:

  • Illyés, S. Thanheiser, P. Schwarzmayr, P.L. David, X. Guerif. A. Werner, M. Haider, sCO2 test facility at TU Wien: design, operation and results
  • Rodríguez-de Arriba, F. Crespi, D. Sánchez, A. Muñoz, A methodology to design air-cooled condensers for supercritical power cycles using carbon dioxide and carbon dioxide mixtures.

The technical papers presented at the conference are now available for download (Open-Access). Get you copy here: Link


Joint paper by City, University of London, University of Seville and Bakher Hughes published in Applied Thermal Engineering

The SCARABEUS teams at City, University of London, University of Seville and Baker Hughes have recently published a paper authored jointly by the three institutions. This scientific publication is the result from the collaboration between Work Package 3 – Turbomachinery Design  and Work Package 5 – Techno-economic, Social and Environmental Assessments. In particular, the team at University of Seville has provided the boundary conditions for the design of the turbines, which has been carried out by City, University of London and Baker Hughes jointly. Then, the impact of the resulting turbomachinery efficiency on cycle performance has been assessed in WP5.

The paper has been published in volume 230 of Applied Thermal Engineering (Elsevier) and it is available in Open Access on the publisher’s website (link). Check the abstract below:

The utilisation of certain blends based on supercritical CO2 (sCO2), namely CO2/TiCl4, CO2/C6H2 and CO2/SO2, have been found to be promising for enhancing the performance of power cycles for Concentrated Solar Power (CSP) applications; allowing for up to a 6% enhancement in cycle efficiency with respect to a simple recuperated CO2 cycle, depending upon the nature of the used blend and the cycle configuration of choice. This paper presents an investigation of the impact of adopting these sCO2-based blends on the flow path design for a multi-stage axial turbine whilst accounting for aerodynamic, mechanical and rotordynamic considerations. This includes assessing the sensitivity of the turbine design to selected working fluid and imposed optimal cycle conditions. Ultimately, this study aims to provide the first indication that a high-efficiency turbine can be achieved for a large-scale axial turbine operating with these non-conventional working fluids and producing power in excess of 120 MW. To achieve this aim, mean-line aerodynamic design is integrated with mechanical and rotordynamic constraints, specified based on industrial experience, to ensure technically feasible solutions with maximum aerodynamic efficiency. Different turbine flow path designs have been produced for three sCO2 blends under different cycle boundary conditions. Specifically, flow paths have been obtained for optimal cycle configurations at five different molar fractions and two different turbine inlet pressure and temperature levels of 250 & 350 bar and 550 & 700 °C respectively. A total-to-total turbine efficiency in excess of 92% was achieved, which is considered promising for the future of CO2 plants. The highest efficiencies are achieved for designs with a large number of stages, corresponding to reduced hub diameters due to the need for a fixed synchronous rotational speed. The large number of stages is contrary to existing sCO2 turbine designs, but it is found that an increase from 4 to 14 stages can increase the efficiency by around 5%. Ultimately, based on the preliminary cost analysis results, the designs with a large number of stages were found to be financially feasible compared to the designs with a small number of stages.


Flowpath optimisation methodology used in the paper

Exhibition at the SCARABEUS experimental facility, TU Wien




As SCARABEUS is reaching the final stage of the project(end scheduled in February 2024), the consortium is very glad and proud to announce the Exhibition that will take place at the Science Centre, TU Wien, hosting the experimental facility where the innovative mixtures and components developed in the course of the project have been tested successfully.

A fabulous programme has been set up by the team at TU Wien, with assorted speakers from academia and industry who will share their experience, knowledge and thoughts about supercritical Carbon Dioxide power cycle technology.

10:00 Welcome – Prof. Markus Haider. Inst. for Energy Systems and Thermodynamics, TU Wien.
10:15 The SCARABEUS project and experimental work

Chaired by Markus Haider (TU Wien)

Overwiew about the SCARABEUS-Project

Prof. Giampaolo Manzolini (Project Coordinator)

Department of Energy, Politecnico di Milano.

The sCO2-test rig at TU Wien

DI Viktoria Illyés (PhD-student)

Institute for Energy Systems and Thermodynamics, TU Wien

11:15 Coffee break
11:30 Presentation of sCO2-test rig and lab of TUW

Markus Haider, Viktoria Illyés, Andreas Werner

Institute for Energy Systems and Thermodynamics, TU Wien

12:30 Lunch  (Catering)
13:30 sCO2 power cycles: Components I, perspectives and experiments

Chaired by Markus Haider (TU Wien)

sCO2 from Baker Hughes´ perspective

Marco Fiori (MSc),

Product Development, Technology and Innovation Strategy

Baker Hughes.

Future outlook and challenges for implementing sCO2 energy conversion systems

Prof. David Sánchez

Department of Energy Engineering, University of Seville.

sCO2 as a working medium – characteristics of flow and heat transfer

Prof. René Pecnik

Head of Process and Energy Laboratory

Delft University of Technology.

15:00 Coffee break
15:30 sCO2 power cycles: Components II and mixtures

Chaired by Andreas Werner (TU Wien)

Turbomachinery from standpoint of research

Prof. T. Turunen-Saaresti

School of Energy Systems LUT University, Finland

Blends for sCO2 in power cycles

Dr. Andreas Jäger

Head of Working Group for Thermal Energy Machinery and -plants

TU Dresden.

sCO2 test rigs: world wide and in Europe (to be confirmed)

Ing. Otakar Frýbort

Centrum Výzkumu Řež, s.r.o., Czech Republic.


Attendance to the Exhibition is free and includes not only a technical tour to the lab and access to the room sessions but also excellent networking opportunities with the partners of the SCARABEUS consortium and fellow attendees. Do not miss this opportunity to get acquainted with the latest developments for next generation Concentrated Solar Power technologies!

Click to download full programme and directions to the venue: download

For more information, get in contact with the Dissemination Manager of the SCARABEUS project: Prof. David Sánchez (




New project on Supercritical Carbon Dioxide power systems opens 17 positions for Early Stage Researchers across Europe

iSOP stands for Innovation in Supercritical Carbon Dioxide Power Systems. It is a four year project funded by the European Commission through the Marie Sklodovska-Curie subprogramme of Horizon Europe, the 100 billion Euro flagship R&D programme in the EU.

iSOP is an Industrial Doctoral Network (MSCA-DN-IN) coordinated by University of Seville (Prof. David T. Sánchez Martínez) and focused on different yet complementary key aspects of the technology: system integration for internally or externally heated concepts, component (turbomachinery and heat exchangers) design and manufacturing, operation, control, materials, enviro-economics… To investigate each topic, an Early Stage Researcher (Doctoral Candidate) will be recruited by two members of the consortium. This is a unique feature of this class of projects, aimed at maximising the exposure of the researchers to both scientific and industrial environments (50% of the time spent at academia and industry).

Check out the complete list of PhD topics available and the associated beneficiaries involved at the iSOP website: Link

Acknowledgement: ISOP has received funding from the European Union’s Horizon Europe research and innovation programme, Marie-Sklodowska-Curie Actions (DN-ID), under Grant Agreement No. 101073266.