Jürg Alexander Schiffmann

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Publications associées (112)

Modeling and Experimental Investigation of an Oil-Free Microcompressor-Turbine Unit for an Organic Rankine Cycle Driven Heat Pump

Jürg Alexander Schiffmann, Jonathan Demierre, Antonio Rubino

Domestic heating and cooling will more and more have to rely on heat pumps (HPs) in order to support a more rational use of primary energy consumption. The HP market is mainly dominated by electrically driven vapor compression cycles and by thermally drive ...

American Society of Mechanical Engineers2015

Integrated Design and Multi-objective Optimization of a Single Stage Heat-Pump Turbocompressor

Jürg Alexander Schiffmann

Small-scale turbomachines in domestic heat pumps reach high efficiency and provide oil-free solutions, which improve heat-exchanger performance and offer major advantages in the design of advanced thermodynamic cycles. An appropriate turbocompressor for do ...

Asme2015

Potential of Small-Scale Turbomachinery for Waste Heat Recovery on Automotive Internal Combustion Engines

Jürg Alexander Schiffmann, Kévin Rosset, Eliott Philippe Guenat, Violette Mounier

This paper investigates the waste heat recovery potential of internal combustion engines, using organic Rankine cycles running on small-scale radial turbomachinery. ORC are promising candidates for low-grade thermal sources and the use of dynamic expanders ...

2015

Experimental investigation of a Thermally Driven Heat Pump based on a double Organic Rankine Cycle and an oil-free Compressor-Turbine Unit

Jürg Alexander Schiffmann, Daniel Favrat, Jonathan Demierre, Johannes Wegele

This paper presents the experimental investigation of a concept of Thermally Driven Heat Pump (TDHP), based on the coupling of a vapor compression heat pump cycle and an Organic Rankine Cycle (ORC). The studied concept uses a single stage centrifugal compr ...

Elsevier2014

Experimental Investigation of Water Injection in an Oil-Free Co-Rotating Scroll Machinery for Compressed Air Energy Storage

Jürg Alexander Schiffmann, Luis Carlos Mendoza Toledo

2014

Small-Scale and Oil-Free Turbocompressor for Refrigeration Application

Jürg Alexander Schiffmann

2014

Modeling and Experimental Investigation of an Oil-Free Micro Compressor-Turbine Unit for an ORC Driven Heat Pump

Jürg Alexander Schiffmann, Jonathan Demierre, Antonio Rubino

2014

Integrated Design and Multi-Objective Optimization of a Single Stage Heat-Pump Turbocompressor

Jürg Alexander Schiffmann

2013

Design, experimental investigation and multi-objective optimization of a small-scale radial compressor for heat pump applications

Jürg Alexander Schiffmann, Daniel Favrat

The main driver for small scale turbomachinery in domestic heat pumps is the potential for reaching higher efﬁciencies than volumetric compressors currently used and the potential for making the compressor oil-free, bearing a considerable advantage in the ...

2010

The effect of real gas on the properties of Herringbone Grooved Journal Bearings

Jürg Alexander Schiffmann, Daniel Favrat

Driven by applications using herringbone grooved bearings lubricated with a gas operating under conditions where the perfect gas assumption is not valid, the real gas effect has been introduced into the existing narrow groove theory. The enhanced model has ...

Elsevier2010

Experimental investigation of a direct driven radial compressor for domestic heat pumps

Jürg Alexander Schiffmann, Daniel Favrat

The presence of oil in domestic heat pumps is an obstacle toward higher efﬁciency, particularly for enhanced surface evaporators and for advanced concepts based on two- stage cycles. Very compact direct driven radial compressors supported on oil-free beari ...

2009

Integrated design, optimization and experimental investigation of a direct driven turbocompressor for domestic heat pumps

Jürg Alexander Schiffmann

Heating and cooling will more and more rely on heat pumping in order to enable a more rational use of energy. The further development of domestic and small industrial multi-stage heat pumps with enhanced performance is impaired by the presence of oil mixed ...

EPFL2008

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