Concept

Working fluid

Publications associées (78)

Macro-to-microchannel transition in two-phase flow: Part 2-Flow boiling heat transfer and critical heat flux

This part of the paper presents the current experimental flow boiling heat transfer and CHF data acquired for R134a, R236fa and R245fa in single, horizontal channels of 1.03, 2.20 and 3.04 mm diameters over a range of experimental conditions. The aim of th ...

Elsevier2011

Phase change behavior of ammonia-water mixtures in corrugated plate heat exchangers

Thomas Wicht

The present report describes the work realized in the frame of a Mas- ter Pro ject in collaboration between the company EnBW Energie Baden- Württemberg AG (Germany) and the Section of Mechanical Engineering of the Swiss Institute of Technology of Lausanne ...

2011

Prototype of a thermally driven heat pump based on integrated organic Rankine cycles (ORC)

Daniel Favrat, Samuel Henchoz, Jonathan Demierre

The concept studied in this work is a low power ORC-ORC system (about 20 kW heat at the condenser) which is composed of an ORC engine cycle driving a reversed ORC heat pump cycle, both using the same fluid. The radial compressor and turbine are directly co ...

2010

Cooling of microprocessors with micro-evaporation: A novel two-phase cooling cycle

John Richard Thome, Jackson Braz Marcinichen, Bruno Michel

Three micro-evaporator cooling cycles, one with a pump, one with a compressor and a hybrid of the two together, are proposed for cooling a computer blade server. The hybrid cycle is characterized by the interchangeability between the first two cycles, wher ...

Elsevier2010

Numerical Modeling of Annular Laminar Film Condensation in Circular and Non-Circular Micro-Channels under Normal and Micro-Gravity

Stefano Nebuloni

A theoretical and numerical model to predict film condensation heat transfer in mini, micro and ultra micro-channels of different internal shapes is presented in this thesis. The model is based on a finite volume formulation of the Navier-Stokes and energy ...

EPFL2010

Flow boiling in horizontal flattened tubes: Part I – Two-phase frictional pressure drop results and model

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

Experiments of diabatic two-phase pressure drops in flow boiling were conducted in four horizontal flattened smooth copper tubes with two different heights of 2 and 3 mm. The equivalent diameters of the flat tubes are 8.6, 7.17. 6.25, and 5.3 mm. The worki ...

2009

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

Daniel Favrat, Jürg Alexander Schiffmann

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

Flow boiling in horizontal flattened tubes: Part II – Flow boiling heat transfer results and model

John Richard Thome, Jesus Moreno Quiben, Ricardo Lima

Experiments of flow boiling heat transfer were conducted in four horizontal flattened smooth copper tubes of two different heights of 2 and 3 mm. The equivalent diameters of the flattened tubes are 8.6, 7.17, 6.25, and 5.3 mm. The working fluids were R22 a ...

2009

Efficient oxygen transfer by surface aeration in shaken cylindrical containers for mammalian cell cultivation at volumetric scales up to 1,000 liters

Alfio Quarteroni, Florian Maria Wurm, David Hacker, Xiuwei Zhang, Nicola Parolini, Mathieu Benjamin Stettler, Marco Perrone, Dario De Sanctis

Cylindrical containers agitated by orbital shaking are being developed as simple and cost-effective bioreactor systems for the cultivation of mammalian cells. Here the oxygen transfer capacities of containers with nominal volumes from 50 mL to 2000 L were ...

2009

Fabrication and Characterisation of Cathode Support-tubes for Micro-tubular SOFC Application

Jan Van Herle, Heinrich Hofmann, Paul Bowen, Stefan Diethelm, John Espen Rossen

Tubes of diameter

2009

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