Publications associées à Chauffage à reflux

Progress in Unraveling Atmospheric New Particle Formation and Growth Across the Arctic

New particle formation (NPF) and growth can be an important source of cloud condensation nuclei for the Arctic atmosphere, where cloud formation is sensitive to their availability. Low-level clouds influence the Arctic energy budget, and likely contribute ...

2021

Reducing Humidity Response of Gas Sensors for Medical Applications: Use of Spark Discharge Synthesis of Metal Oxide Nanoparticles

Thomas Maeder

The application of gas sensors in breath analysis is an important trend in the early diagnostics of different diseases including lung cancer, ulcers, and enteric infection. However, traditional methods of synthesis of metal oxide gas-sensing materials for ...

MDPI2018

Flow boiling data and prediction method for enhanced boiling tubes and tube bundles with R-134a and R-236fa including a comparison with falling film evaporation

John Richard Thome, Eugene van Rooyen

New enhanced boiling tubes from Wolverine Tube Inc. (Turbo-B5) and Wieland-Werke AG (Gewa-B5) were investigated using R-134a and R-236fa as test fluids. The tests were done at saturation temperatures of 5 and 15 degrees C, mass flow rates from 4 to 35 kg m ...

Elsevier Sci Ltd2014

Falling film evaporation on enhanced tubes, part 1: Experimental results for pool boiling, onset-of-dryout and falling film evaporation

John Richard Thome, Marcel Christians

Horizontal falling film evaporators have the potential of displacing flooded evaporators as the standard in the refrigeration industry due to compelling advantages, such as smaller refrigerant charge and lower pressure drop. However, there is a need to imp ...

2012

Falling-Film Evaporation On Tube Bundle With Plain And Enhanced Tubes-Part I: Experimental Results

John Richard Thome, Mathieu Habert

The complexities of two-phase flow and falling-film evaporation on a tube bundle present important challenges in the design of heat exchangers and the understanding of the physical phenomena taking place. The development of structured surfaces to enhance n ...

2010

Heat Transfer and Visualization of Falling Film Evaporation on a Tube Bundle

Marcel Christians

Horizontal falling film evaporators have the potential of displacing flooded evaporators in industry, due to advantages such as lower required refrigerant charge and lower pressure drop. However, there is a need to improve the understanding of falling film ...

EPFL2010

Measurement-based Optimization of Batch Processes: Meeting Terminal Constraints On-line via Trajectory Following

Dominique Bonvin, Carsten Welz

The context of this paper is the use of process measurements to optimize batch processes in the presence of uncertainty. The optimal solution consists of (i) keeping certain path and terminal constraints active and (ii) driving the sensitivities to zero. I ...

2008

Two-Phase Flow and Heat Transfer across Horizontal Tube Bundles – A Review

John Richard Thome

This paper presents a state-of-the-art review of two-phase flow and flow boiling across horizontal tube bundles. The review covers studies related to the dynamic aspects of two-phase flow on the shell side of staggered and in-line tube bundles for upward, ...

Taylor & Francis2007

Evaluation of Input Parameterization for Batch Process Optimization

Dominique Bonvin, Alejandro Gabriel Marchetti, Carsten Welz

For the optimization of dynamic systems, it is customary to use measurements to combat the effect of uncertainty. In this context, an approach that consists of tracking the necessary conditions of optimality is gaining in popularity. The approach relies st ...

2006

Measurement-based Run-to-run Optimization of a Batch Reaction-distillation system

Dominique Bonvin, Alejandro Gabriel Marchetti

Recently, measurement-based optimization schemes have been developed to deal with uncertainty and process variations. One of the methods therein, labeled NCO tracking, relies on appropriate parameterization of the input profiles and adjusts the correspondi ...

2005