@misc{KabatJendeYueceletal., author = {Kabat, Nancy and Jende, Enrico and Y{\"u}cel, Fatma Cansu and Stathopoulos, Panagiotis}, title = {Thermodynamic analysis of a novel high-temperature heat pump cycle with inter cooled compression and reheated expansion based on the reversed Brayton cycle}, series = {International journal of sustainable energy}, volume = {44}, journal = {International journal of sustainable energy}, number = {1}, publisher = {Taylor \& Francis}, address = {Abingdon, Oxon}, issn = {1478-6451}, doi = {10.1080/14786451.2025.2515452}, pages = {1 -- 37}, abstract = {High temperature heat pumps offer a promising approach to deliver CO2-neutral process heat by upgrading waste heat with electricity from renewable resources. In this work, a heat pump cycle including inter cooled compression and reheated expansion is presented and compared to the simple Brayton cycle. Numerical simulations are used to investigate the provision of process heat at 250°C and process cooling at -30°C. An exergy analysis and parameter study is carried out. The results show an improved performance of the complex cycle as a result of more efficient temperature profiles improving the exergy utilisation. While previous studies often consider idealised process variants or are focused on individual purposes, the present work contributes to the analysis and evaluation of complex cycles with multi-stage process control while simultaneously supplying heat and cold. A deeper understanding of the thermodynamic interactions provides a reliable basis for the energy-related design of systems with multiple temperature levels.}, language = {en} } @misc{VankelekomStathopoulosDemeyeretal., author = {Vankelekom, Christophe and Stathopoulos, Panagiotis and Demeyer, Frederiek and De Paepe, Ward}, title = {Thermodynamic performance assessment of recuperated Brayton cycle high-temperature heat pumps for combined heat and cold roduction}, series = {Proceedings of ASME Turbo Expo 2025 : Turbomachinery Technical Conference and Exposition, June 16-20, 2025, Memphis, Tennessee : Volume 4 : Controls, Diagnostics \& Instrumentation; Cycle Innovations; Education; Electric Power}, journal = {Proceedings of ASME Turbo Expo 2025 : Turbomachinery Technical Conference and Exposition, June 16-20, 2025, Memphis, Tennessee : Volume 4 : Controls, Diagnostics \& Instrumentation; Cycle Innovations; Education; Electric Power}, editor = {Vankelekom, Christophe}, publisher = {American Society of Mechanical Engineers}, address = {New York, NY}, isbn = {978-0-7918-8880-3}, doi = {10.1115/GT2025-153988}, pages = {14}, abstract = {Producing heat at high temperatures for industrial processes like chemistry, food, or paper is still achieved using fossil fuels. To reach net-zero CO2 emissions by 2050, as desired by the European Union, technology driven by renewable energy must emerge to electrify these sectors. For this reason, high-temperature heat pumps, based on a Reversed Brayton Cycle working with air, offer a promising solution. Indeed, nowadays, most high-temperature heat pumps are vapor compression cycles but they face several issues when a higher temperature is necessary (200 °C or more). The selection of refrigerant is challenging (high compression ratio and temperature limitation), and it has a non-negligible environmental impact. Nevertheless, the Reversed Brayton cycle still suffers from a low Coefficient Of Performance (COP) that could be improved by valorizing the cold heat flux produced in the cycle. In the literature, few works are related to this combined use of heating and cooling for sub-MWth applications, which is very important for the food industry (cooking and freezing). With this work, we aim to fill this gap by proposing an analysis of the achievable potential based on the 2nd law of thermodynamics using a generic model in Aspen Plus. Using a heat sink of 250 °C and 300 °C and a heat source of -10 °C, the potential of different cycles were analyzed by varying the secondary inlet temperature of the heat sink from 100 °C to 200 °C. For low inlet temperatures, the heating and total COP can reach a value of up to 1.3 and 1.66 respectively with an exergetic efficiency up to 54\%. The COP decreases when the secondary inlet temperature of the heat sink increases while the exergy efficiency stays almost constant. A further increase does not allow to provide cooling anymore for lower outlet heat sink temperature.}, language = {en} } @misc{BarryYoshikawaKangetal., author = {Barry, Elhadj and Yoshikawa, Harunori and Kang, Changwoo and Meyer, Antoine and Meier, Martin and Crumeyrolle, Olivier and Egbers, Christoph and Mutabazi, Innocent}, title = {Thermoelectric convection in a planar capacitor: theoretical studies and experiments in parabolic flights}, series = {Comptes Rendus M{\´e}canique}, journal = {Comptes Rendus M{\´e}canique}, issn = {1873-7234}, pages = {1 -- 15}, language = {en} } @inproceedings{MutabaziKangMeyeretal., author = {Mutabazi, Innocent and Kang, Changwoo and Meyer, Antoine and Jongmanns, Marcel and Meier, Martin and Egbers, Christoph}, title = {Thermoelectric convection in dielectric liquids in a cylindrical annulus}, series = {International Conference on Rayleigh B{\´e}nard Turbulence, May 14-18, 2018, Enschede, NL}, booktitle = {International Conference on Rayleigh B{\´e}nard Turbulence, May 14-18, 2018, Enschede, NL}, pages = {S. 83}, language = {en} } @misc{MeyerYoshikawaSzaboetal., author = {Meyer, Antoine and Yoshikawa, Harunori and Szabo, Peter and Meier, Martin and Egbers, Christoph and Mutabazi, Innocent}, title = {Thermoelectric instabilities in a circular Couette flow}, series = {Philosophical transactions of the Royal Society. Series A, Mathematical, physical and engineering sciences}, volume = {381}, journal = {Philosophical transactions of the Royal Society. Series A, Mathematical, physical and engineering sciences}, number = {2243}, issn = {1471-2962}, doi = {10.1098/rsta.2022.0139}, language = {en} } @misc{MeyerSeeligGerstneretal., author = {Meyer, Antoine and Seelig, Torsten and Gerstner, Philipp and Kang, Changwoo and Meier, Martin and Jongmanns, Marcel and Baumann, Martin and Mutabazi, Innocent and Heuveline, Vincent and Egbers, Christoph}, title = {Thermoelectric instability in a vertical cylindrical annulus}, series = {8th International Symposium on Bifurcations and Instabilities in Fluid Dynamics (BIFD), 16-19 July, 2019, University of Limerick, Ireland}, journal = {8th International Symposium on Bifurcations and Instabilities in Fluid Dynamics (BIFD), 16-19 July, 2019, University of Limerick, Ireland}, address = {Limerick}, pages = {1}, language = {en} } @misc{MeyerMeierSzaboetal., author = {Meyer, Antoine and Meier, M. and Szabo, Peter and Sliavin, Yaraslau and Motuz, Vasyl and Gerstner, Philipp and Roller, Jonas and Heuveline, Vincent and Egbers, Christoph}, title = {Thermoelectric instability of a dielectric fluid in a cylindrical annulus with vertical or horizontal orientation}, series = {European Fluid Mechanics Conference EFMC14}, journal = {European Fluid Mechanics Conference EFMC14}, pages = {37}, language = {en} } @misc{YoshikawaKangMutabazietal., author = {Yoshikawa, Harunori and Kang, Changwoo and Mutabazi, Innocent and Zaussinger, Florian and Haun, Peter and Egbers, Christoph}, title = {Thermoelectrohydrodynamic convection in parallel plate capacitors under dielectric heating conditions}, series = {Physical review fluids}, volume = {5}, journal = {Physical review fluids}, number = {11}, issn = {2469-990X}, doi = {10.1103/PhysRevFluids.5.113503}, pages = {17}, language = {en} } @inproceedings{JongmannsSeeligEgbersetal., author = {Jongmanns, Marcel and Seelig, Torsten and Egbers, Christoph and Meier, Martin and Meyer, Antoine and Crumeyrolle, Olivier and Mutabazi, Innocent}, title = {Thermoelectrohydrodynamic experiments in a cylindrical gap}, series = {Book of abstracts, School ISTROF 2016, Instabilities and Turbulence in Strato-Rotational Flows, July 11-13th, 2016, Le Havre}, booktitle = {Book of abstracts, School ISTROF 2016, Instabilities and Turbulence in Strato-Rotational Flows, July 11-13th, 2016, Le Havre}, language = {en} } @misc{ZanounJehringEgbers, author = {Zanoun, El-Sayed and Jehring, Lothar and Egbers, Christoph}, title = {Three measuring techniques for assessing the mean wall skin friction in wall-bounded flows}, series = {Thermophysics and Aeromechanics}, volume = {21}, journal = {Thermophysics and Aeromechanics}, number = {2}, issn = {1531-8699}, pages = {179 -- 190}, language = {en} } @inproceedings{ScurtuFuttererEgbers, author = {Scurtu, Nicoleta and Futterer, Birgit and Egbers, Christoph}, title = {Three-dimensional natural Convection in spherical annuli}, language = {en} } @article{ScurtuFuttererEgbers, author = {Scurtu, Nicoleta and Futterer, Birgit and Egbers, Christoph}, title = {Three-dimensional natural Convection in spherical annuli}, language = {en} } @inproceedings{HarlanderMaas, author = {Harlander, Uwe and Maas, L. R. M.}, title = {Tide-topography interactions?}, language = {en} } @incollection{BeltrameEgbersTravnikov, author = {Beltrame, Philippe and Egbers, Christoph and Travnikov, Vadim}, title = {Time-dependent dynamics in the "GEOFLOW" experiment on the ISS}, language = {en} } @misc{HallolYousryMerboldetal., author = {Hallol, Zeinab and Yousry, Mohamed and Merbold, Sebastian and Egbers, Christoph}, title = {Time-resolved PIV measurements in fully developed turbulent pipe flow}, series = {25th International Congress of Theoretical and Applied Mechanics Milan (Italy), 22-27 August 2021}, journal = {25th International Congress of Theoretical and Applied Mechanics Milan (Italy), 22-27 August 2021}, isbn = {978-83-65550-31-6}, pages = {1374 -- 1375}, language = {en} } @inproceedings{MerboldFroitzheimEgbers, author = {Merbold, Sebastian and Froitzheim, Andreas and Egbers, Christoph}, title = {Torque in turbulent Taylor-Couette flow for small radius ratios}, series = {Proceedings of the 5th International Conference on Experimental Fluid Mechanics, Munich 2018}, booktitle = {Proceedings of the 5th International Conference on Experimental Fluid Mechanics, Munich 2018}, editor = {K{\"a}hler, Christian J. and Hain, Rainer and Scharnowski, Sven and Fuchs, Thomas}, publisher = {Institute of Fluid Mechanics and Aerodynamics, Universit{\"a}t der Bundeswehr}, address = {Neubiberg}, isbn = {978-3-943207-32-3}, doi = {10.18726/2018_2}, pages = {598 -- 602}, language = {en} } @inproceedings{FroitzheimMerboldEgbers, author = {Froitzheim, Andreas and Merbold, Sebastian and Egbers, Christoph}, title = {Torque measurements and flow visualization in a wide gap Taylor-Couette Flow}, series = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, booktitle = {15th European turbulence conference (ETC), Delft, The Netherlands (2015)}, pages = {2}, language = {en} } @misc{MerboldBrauckmannEgbers, author = {Merbold, Sebastian and Brauckmann, Hannes and Egbers, Christoph}, title = {Torque measurements and numerical determination in differentially rotating wide gap Taylor-Couette flow}, series = {Physical Review E}, volume = {87}, journal = {Physical Review E}, number = {2}, issn = {1550-2376}, doi = {10.1103/PhysRevE.87.023014}, pages = {023014 -1 -- 023014 -4}, language = {en} } @inproceedings{FroitzheimMerboldEgbers, author = {Froitzheim, Andreas and Merbold, Sebastian and Egbers, Christoph}, title = {Torque measurements in a Taylor-Couette experiment with very small radius ration of 0.357}, series = {16th European Turbulence Conference, 21-24 August, 2017, Stockholm, Sweden}, booktitle = {16th European Turbulence Conference, 21-24 August, 2017, Stockholm, Sweden}, pages = {1}, language = {en} } @inproceedings{MerboldEgbers, author = {Merbold, Sebastian and Egbers, Christoph}, title = {Torque measurements in a wide gap Taylor-Couette flow}, series = {14th European Turbulence Conference, Lyon, France, September 1-4, 2013}, booktitle = {14th European Turbulence Conference, Lyon, France, September 1-4, 2013}, pages = {2}, language = {en} }