Jürg Alexander Schiffmann
EPFL STI IGM LAMD
MC B2 255 (Bâtiment MC)
Rue de la Maladière 71b, CP 526
CH-2002 Neuchâtel 2
+41 21 695 45 48
+41 21 695 45 13
Local:
MC B2 245
EPFL
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LAMD
Web site: Site web: https://lamd.epfl.ch/
Domaines de compétences
Integrated mechanical design and optimization
Small scale turbomachinery
Gas lubricated bearings
Rotordynamics
Heat pumps
Organic Rankine Cycles
Gas turbines
Small scale turbomachinery
Gas lubricated bearings
Rotordynamics
Heat pumps
Organic Rankine Cycles
Gas turbines
Biographie
After obtaining his diploma in mechanical engineering from EPFL in 1999 he co-founded a start-up company dedicated to the design of gas bearing supported rotors. In 2005 he joined Fischer Engineering Solutions where he led the development of small-scale, gas bearing supported high-speed turbomachinery for fuel cell air supplies and for domestic scale heat pumps. In parallel he worked on his PhD, which he obtained from EPFL in 2008 and for which he was awarded the SwissElectric Research Award. He then joined the Gas Turbine Lab at MIT as a postdoctoral associate where he worked on foil bearings and on the experimental investigation of radial diffusers. In 2013 he was nominated assistant professor at the Ecole Polytechnique Fédérale de Lausanne where he founds the Laboratory for Applied Mechanical Design. His current research interest are in gas lubricated bearings, in aerodynamics of small-scale compressors and turbines and in automated design and optimization methodologies.Publications
Publications Infoscience
Publications
Flow pattern observations and flow pattern map for adiabatic two-phase flow of carbon dioxide in vertical upward and downward direction
Experimental Thermal and Fluid Science. 2022-02-01. DOI : 10.1016/j.expthermflusci.2021.110526.Modelling and Sensors for Magnetically-Levitated Disc Drives
Lausanne, EPFL, 2022. DOI : 10.5075/epfl-thesis-8837.Stability and Unbalance Analysis of Rigid Rotors Supported by Spiral Groove Bearings: Comparison of Different Approaches
Journal of Engineering for Gas Turbines and Power. 2021-12-01. DOI : 10.1115/1.4052025.A reduced order model to predict the machining time and cost of small-scale radial-inflow turbines
2021-11-04. 6th International Seminar on ORC Power Systems (ORC2021), Munich, Germany, October 11-13, 2021.The effects of the tip clearance on the performance of small-scale turbopumps for ORC applications; analysis and modeling
2021-11-04. 6th International Seminar on ORC Power Systems (ORC2021), Munich, Germany, October 11-13, 2021.Techno-Economic Optimization of an Integrated Biomass Waste Gasifier–Solid Oxide Fuel Cell Plant
Frontiers in Energy Research. 2021-06-07. DOI : 10.3389/fenrg.2021.665585.On the Application of Small-Scale Turbines in Industrial Steam Networks
Energies. 2021-05-28. DOI : 10.3390/en14113149.Which professional skills do students learn in engineering team-based projects?
European Journal of Engineering Education. 2021-05-11. DOI : 10.1080/03043797.2021.1920890.Unstable tilting motion of flexibly supported gas bearing bushings
Mechanical Systems and Signal Processing. 2021-05-10. DOI : 10.1016/j.ymssp.2021.107981.Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine with Partial-Admission
Journal of Engineering for Gas Turbines and Power. 2021-03-31. DOI : 10.1115/1.4049483.Experimental Investigation of a Small-Scale Organic Rankine Cycle Turbo-Generator Supported on Gas-Lubricated Bearings
Journal of Engineering for Gas Turbines and Power. 2021-03-11. DOI : 10.1115/1.4049988.Theoretical and Experimental Investigation of a 34 Watt Radial-Inflow Steam Turbine with Partial-Admission
2021-01-11. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, London, England - virtual conference, June 22-26, 2020. p. GT2020-15804, V008T20A023. DOI : 10.1115/GT2020-15804.Influence of Large Relative Tip Clearances for a Micro Radial Fan and Design Guidelines for Increased Efficiency
2021-01-11. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, London, England - virtual conference, June 22-26, 2020. p. GT2020-15994, V008T20A025. DOI : 10.1115/GT2020-15994.Experimental investigation and analysis of sequential jet impingement concepts for enhanced turbine cooling
Lausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-8721.Flexibility for large-scale deployment of PV systems in low-voltage grids
Lausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-8852.Automated Design: A Journey Across Modelling, Optimization, and Education
Lausanne, EPFL, 2021. DOI : 10.5075/epfl-thesis-7945.Prediction of the reaction forces of spiral-groove gas journal bearings by artificial neural network regression models
Journal of Computational Science. 2021-01-01. DOI : 10.1016/j.jocs.2020.101256.Nonlinear study on a rigid rotor supported by herringbone grooved gas bearings: Theory and validation
Mechanical Systems and Signal Processing. 2021-01-01. DOI : 10.1016/j.ymssp.2020.106983.Automated Design Tool for Automotive Control Actuators
2020-11-03. 46th Design Automation Conference (DAC), Virtual, Online, August 17–19, 2020. DOI : 10.1115/DETC2020-22390.Realistic Constrained Multi-Objective Optimization Benchmark Problems from Design
IEEE Transactions on Evolutionary Computation. 2020-08-28. DOI : 10.1109/TEVC.2020.3020046.Actuator Synthesis and Optimization: Evaluation of Graph-Based Approaches
2020-06-19Experimental Assessment of a 3D-Printed Stainless Steel Gas Foil Bearing
Journal of Tribology. 2020-06-05. DOI : 10.1115/1.4047193.Extended Windage Loss Models for Gas Bearing Supported Spindles Operated in Dense Gases
Journal of Engineering for Gas Turbines and Power. 2020-06-01. DOI : 10.1115/1.4047124.Analysis of Spiral-Grooved Gas Journal Bearings by the Narrow-Groove Theory and the Finite Element Method At Large Eccentricities
Journal of Tribology. 2020-04-01. DOI : 10.1115/1.4045636.Flexible Support for Gas-Lubricated Bearing Bushings
Tribology Transactions. 2020-03-25. DOI : 10.1080/10402004.2020.1717702.The Role of Reynolds Number Effect and Tip Leakage in Compressor Geometry Scaling at Low Turbulent Reynolds Numbers
Journal of Turbomachinery. 2020-03-15. DOI : 10.1115/1.4045465.Experimental characterization of a solid oxide fuel cell coupled to a steam-driven micro anode off-gas recirculation fan
Applied Energy. 2020-03-15. DOI : 10.1016/j.apenergy.2019.114219.Theoretical and Experimental Investigation of a Small-scale, High-speed, and Oil-free Radial Anode Off-gas Recirculation Fan for Solid Oxide Fuel Cell Systems
Journal of Engineering for Gas Turbine and Power. 2020-02-14. DOI : 10.1115/1.4045104.Pressure Profile Measurements within The Gas Film of Journal Foil Bearings Using An Instrumented Rotor with Telemetry
Journal of Engineering for Gas Turbines and Power. 2020-02-03. DOI : 10.1115/1.4044798.Dynamic force coefficients identification on air-lubricated herringbone grooved journal bearing
Mechanical Systems and Signal Processing. 2020-02-01. DOI : 10.1016/j.ymssp.2019.106498.An Instrumented High-Speed Rotor with Embedded Telemetry for The Continuous Spatial Pressure Profile Measurement in Gas Lubricated Bearings: A Proof of Concept
Journal of Engineering for Gas Turbines and Power. 2020-01-29. DOI : 10.1115/1.4044797.Small-scale organic Rankine cycle turbo-generator for waste heat recovery on truck engine
Lausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-10347.Numerical and experimental investigations on non-contacting seals for small-scale applications
Lausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-10289.Experimental and Numerical Investigation of a Small-Scale Steam Turbine
2020-01-01Sofc system with anode off-gas recirculation
EP3834244 ; WO2020030796 ; EP3609006 . 2020.Advanced design methods and non-ideal gas lubrication applied to aerodynamic bearings
Lausanne, EPFL, 2020. DOI : 10.5075/epfl-thesis-7790.Scale limitations of gas bearing supported turbocompressors for vapor compression cycles
International Journal of Refrigeration. 2020-01-01. DOI : 10.1016/j.ijrefrig.2019.09.019.A Review of Grooved Dynamic Gas Bearings
Applied Mechanics Reviews. 2020-01-01. DOI : 10.1115/1.4044191.An Instrumented High-Speed Rotor With Embedded Telemetry For The Continuous Spatial Pressure Profile Measurement In Gas Lubricated Bearings: A Proof Of Concept
2019-11-05. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, AZ, Jun 17-21, 2019. p. V07BT34A026.Thin Gas Film Isothermal Condensation in Aerodynamic Bearings
Journal of Tribology. 2019-11-01. DOI : 10.1115/1.4044447.Design and Experimental Realization of a Steam-Driven Micro Recirculation Fan for Solid Oxide Fuel Cell Systems
2019-09-08. 16th Symposium on Solid Oxide Fuel Cells (SOFC-XVI), Kyoto, Japan, September 8-13, 2019. p. 187-193. DOI : 10.1149/09101.0187ecst.High temperature heat pumps – Theoretical study on low GWP HFO and HCFO refrigerants
2019-08-25. ICR 2019 - The 25th IIR International Congress of Refrigeration, Montréal, Québec, Canada, August 24-30, 2019.High temperature heat pump using HFO and HCFO refrigerants – system design and experimental results
2019-08-25. ICR 2019 - The 25th IIR International Congress of Refrigeration, Montréal, Québec, Canada, August 24-30, 2019.Multi-Objective Optimization of Grooved Gas Journal Bearings for Robustness in Manufacturing Tolerances
Tribology Transaction. 2019-08-22. DOI : 10.1080/10402004.2019.1642547.Data-Driven Model for the Dynamic Characteristics of O-Rings for Gas Bearing Supported Rotors
Journal of Applied Mechanics. 2019-08-01. DOI : 10.1115/1.4043473.Theoretical and Experimental Investigation of a Small-Scale, High-Speed, and Oil-Free Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems
2019-06-17. ASME Turbo Expo 2019, Phoenix AZ, USA, June 17-21, 2019. p. GT2019-91361. DOI : 10.1115/GT2019-91361.Impact of large tip clearance ratios on the performance of a centrifugal compressor
2019-04-08. Euro Turbo Conderence ETC13, Lausanne, Switzerland, April 8-12, 2019.Performance potential of gas foil thrust bearings enhanced with spiral grooves
Tribology International. 2019-03-01. DOI : 10.1016/j.triboint.2018.11.003.Assessing student learning of design and project management skills in a project-based course
SFDN Conference 2019, Zurich, Switzerland.Two-phase and oil-free co-rotating scroll compressor/expander
Applied Thermal Engineering. 2019-02-05. DOI : 10.1016/j.applthermaleng.2018.11.037.Analytical and Numerical Investigation of a Small-scale Radial-Inflow Steam Turbine
2019-01-31Pressure Profile Measurements Within The Gas Film Of Journal Foil Bearings Using An Instrumented Rotor With Telemetry
2019. ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, AZ, Jun 17-21, 2019.Flexible support and enhanced groove geometries for gas lubricated bearings
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9774.Predicting the dynamic behavior of Francis turbine generating units
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-7131.Mitigation of tip leakage induced phenomena in a low Reynolds number centrifugal compressor via blade loading distribution
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9720.Cylindrical Dielectric Elastomer Actuator for Cardiac Assist Device
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9397.Integrated Design, Optimization, and Experimental Realization of a Steam-Driven Micro Recirculation Fan for Solid Oxide Fuel Cell Systems
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9337.An Experimental Study of Gas Lubricated Foil Journal Bearings Using an Instrumented Rotor with Wireless Telemetry
Lausanne, EPFL, 2019. DOI : 10.5075/epfl-thesis-9163.Data-Driven Predesign Tool for Small-Scale Centrifugal Compressor in Refrigeration
Journal of Engineering for Gas Turbines and Power. 2018-10-24. DOI : 10.1115/1.4040845.Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal Bearings
Tribology Transactions. 2018-10-04. DOI : 10.1080/10402004.2018.1480078.Impacts of Constraints and Constraint Handling Strategies for Multi-Objective Mechanical Design Problems
2018-07-15. GECCO '18, Kyoto, Japan, July 15–19, 2018. p. 1341–1347. DOI : 10.1145/3205455.3205526.High Temperature Heat Pumps: Market Overview, Stateof the Art, Research Status, Refrigerants, and Application Potentials
2018-07-09. 17th International Refrigeration and Air Conditioning Conference, Purdue, USA, July 9-12, 2018. p. 2200, Page 1-10.Small, High-Speed, Oil-Free Radial Turbo-compressors for Cooling Applications: Refrigerant Selection
2018-07-09. 24 th International Compressor Engineering Conference, Purdue, USA, July 9-12, 2018. p. 2386, pages 1-10.High temperature heat pump using HFO and HCFO refrigerants – System design, simulation, and first experimental results
2018-07-09. 17 th International Refrigeration and Air Conditioning Conference at Purdue, Purdue, USA, July 9-12, 2018.Multi-objective optimization of turbo-ORC systems for waste heat recovery on passenger car engines
Energy. 2018-06-27. DOI : 10.1016/j.energy.2018.06.193.Effects of humid air on aerodynamic journal bearings
Tribology International. 2018-06-15. DOI : 10.1016/j.triboint.2018.06.002.Data-Driven Pre-Design Tool for Small Scale Centrifugal Compressors in Refrigeration
2018-06-11. ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Oslo, Norway, June 11-15, 2018. p. V008T26A012. DOI : 10.1115/GT2018-76349.Dimensionless correlations and performance maps of scroll expanders for micro-scale Organic Rankine Cycles
Energy. 2018-05-06. DOI : 10.1016/j.energy.2018.05.001.Real-gas effects on aerodynamic bearings
Tribology International. 2018-01-08. DOI : 10.1016/j.triboint.2018.01.008.A co-rotational scroll machine
US2021062807 ; EP3740679 ; CN111630277 ; WO2018134739 . 2018.Pumps running as turbines for energy recovery in water supply systems
Lausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-9036.Potential and Challenges of ORC driven Heat Pumps Based on Gas Bearing Supported Turbomachinery
Lausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8567.High temperature heat pumps: Market overview, state of the art, research status, refrigerants, and application potentials
Energy. 2018. DOI : 10.1016/j.energy.2018.03.166.Experimental characterisation of the thermohydraulic performance of a micro-pin fin evaporator: Heat transfer, flow visualization and modelling
Lausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8423.MEMS Generator Study for an Embedded Energy Harvesting System
Lausanne, EPFL, 2018. DOI : 10.5075/epfl-thesis-8380.Dynamic pressure probe response tests for robust measurements in periodic flows close to probe resonating frequency
Measurement Science and Technology. 2018. DOI : 10.1088/1361-6501/aa9cf4.Small scale radial inflow turbine performance and pre-design maps for Organic Rankine Cycles
Energy. 2018. DOI : 10.1016/j.energy.2017.11.002.Non-linear transfer function identification of pressure probes using Siren Disks
Experimental Thermal and Fluid Science. 2018. DOI : 10.1016/j.expthermflusci.2017.11.001.Blade Tio Loss in a Small-Scale Fan
2017-06-09Comparative Evaluation of Foil Bearings with Different Compliant Structures for Improved Manufacturability
2017. ASME Turbo Expo, Charlotte, North Carolina, USA, June 26-30, 2017. p. V07AT34A014. DOI : 10.1115/GT2017-63615.Thermo-economic optimization of an ORC driven heat pump based on small scale turbomachinery and comparison with absorption heat pumps
International Journal of Refrigeration. 2017. DOI : 10.1016/j.ijrefrig.2017.05.021.Modeling and Designing of a Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems
Journal of Electrochemical Energy Conversion and Storage. 2017. DOI : 10.1115/1.4036401.Heat Pump driven by a Small-Scale Oil-Free Turbocompressor – System Design and Simulation
2017. 12th IEA Heat Pump Conference 2017, Rotterdam, Netherlands, May 14-18, 2017.ORC Driven Heat Pump Running on Gas Bearings for Domestic Applications: Proof of Concept and Thermo-Economic Improvement Potential
2017. 12th IEA heat Pump Conference 2017, Rotterdam, Netherlands, May 14-18, 2017.Theoretical analysis of steam generation methods - Energy, CO 2 emission, and cost analysis
Energy. 2017. DOI : 10.1016/j.energy.2017.04.088.Turbocompressors for Domestic Heat Pumps – A Critical Review
2017. 12th IEA Heat Pump Conference 2017, Rotterdam, Netherlands, May 14-18, 2017.The Role of Impeller Outflow Conditions on the Performance of Vaned Diffusers
Journal of Turbomachinery. 2017. DOI : 10.1115/1.4035048.On the manufacturing of compliant foil bearings
Journal of Manufacturing Processes. 2017. DOI : 10.1016/j.jmapro.2016.12.021.Testing and modelling of a novel oil-free co-rotating scroll machine with water injection
Applied Energy. 2017. DOI : 10.1016/j.apenergy.2016.10.089.Theoretical Study of a Novel Oil-Free Co-Rotating Scroll Compressor Integrated into a Hybrid Absorption Heat Pumps
2016. 12th IIR-Gustav Lorentzen Conference on Natural Refrigerants, Edinburgh, UK, 21st-24th August 2016.Analysis of a Combined Absorption Cycle for Power and Cooling Production Using a Novel Oil-Free Co-Rotating Scroll Expander
2016. 12th IIR-Gustav Lorentzen Conference on Natural Refrigerants, Edinburgh, UK, 21st-24th August 2016.Multi-temperature heat pumps: A literature review
International Journal Of Refrigeration-Revue Internationale Du Froid. 2016. DOI : 10.1016/j.ijrefrig.2016.05.014.Flow Boiling Pressure Drop and Heat Transfer of Refrigerants in Multi-microchannel Evaporators under Steady and Transient States
Lausanne, EPFL, 2016. DOI : 10.5075/epfl-thesis-7306.Two-Stage Heat Pump using Oil-Free Turbocompressors – System Design and Simulation
2016. 16 th International Refrigeration and Air Conditioning Conference at Purdue, Purdue, West Lafayette, USA, July 11-14, 2016.Experimental investigation of a two-stage oil-free domestic Air/Water heat pump prototype powered by an oil-free high-speed twin-stage radial compressor rotating on gas bearings
2016. 16 th International Refrigeration and Air Conditioning Conference at Purdue, Purdue, West Lafayette, USA, July 11-14, 2016.Multi-Temperature Heat Pumps - A Literature Review
2016. 16 th International Refrigeration and Air Conditioning Conference at Purdue, Purdue, West Lafayette, USA, July 11-14, 2016.Design of Oil-Free Turbocompressors for a Two-Stage Industrial Heat Pump under Variable Operating Conditions
2016. 23 rd International Compressor Engineering Conference at Purdue, Purdue, West Lafayette, USA, July 11-14, 2016.Small-scale turbocompressors for wide-range operation with large tip-clearances for a two-stage heat pump concept
International Journal of Refrigeration. 2016. DOI : 10.1016/j.ijrefrig.2016.06.015.THE ROLE OF IMPELLER OUTFLOW CONDITIONS ON THE PERFORMANCE OF VANED DIFFUSERS
2016. ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, Seoul, South Korea, June 13 – 17, 2016.Étude des engrenages de microtechnique
Lausanne, EPFL, 2016. DOI : 10.5075/epfl-thesis-6890.Enseignement & Phd
Enseignement
Mechanical Engineering
Programmes doctoraux
Doctoral Program in Energy
Doctoral Program in Microsystems and Microelectronics
Doctoral program in advanced manufacturing
Doctoral program in robotics, control, and intelligent systems
Doctoral Program in Mechanics