Presentazioni e Articoli Tecnici

In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Simulation of a Multilayer Thermal Regulator for an Optical Reference

J.A. Ospina[1] and E. Canuto[1]
[1]Politecnico di Torino, Torino, Italy

The research project under which the COMSOL simulations are performed deals with multilayer and fine thermal control of an optical reference cavity for space applications. The cavity, made of Ultra Low Expansion glass (Corning ULE), must be kept close to the zero expansion temperature of the glass (close to room temperature). The target can only be met by active control, while leaving the cavity ...

Heat and Mass Transfer in Multilayer Fabrics

S. Quiniou1, F. Lesage1, V. Ventenat2, and M. A. Latifi1
1Laboratoire des Sciences du Génie Chimique, Nancy, France
2Centre de Recherche Decathlon, Villeneuve d'Ascq, France

In this paper, an investigation of heat and mass transfer in two-layer fabrics, used in the manufacture of comfortable sportswear, is presented. It is based on a model described by partial differential equations representing the mass balance of water vapor, free and adsorbed water and the heat balance in the fabric. The model involves several unknown physical and transfer parameters. A specific ...

Thermal Analysis of Vacuum Distillation Chamber in Pyroprocessing Facility

D. Sujish, S. Agarwal, B. Muralidharan, B.K. Sharma, V. Suresh Kumar, B. Prabhakara Reddy, G. Ravisankar, K. Nagarajan, C.A. Babu, and P. Kalyanasundaram
Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India

Non aqueous metal fuel reprocessing involves electrochemical deposition of spent metallic fuel on the cathode of an electrolytic cell. Apart from metal fuel, the cathode deposit would also contain occluded molten salts and liquid cathode. Subsequent purification and consolidation of these heavy metals is conducted in a vacuum retort. Here the cathode deposits are charged into graphite crucible ...

Thermo-Fluidic Impulse Response and TOF Analysis of a Pulsed Hot Wire

O. Ecin, M. Malek, B. J. Hosticka, and A. Grabmaier
Chair for Electronic Components and Circuits
University of Duisburg-Esse
Duisburg, Germany

In this work the authors report on a CFD simulation of a pipe flow model. Fluid mechanics are here combined with heat transfer phenomena. To create a mathematical model of a pulsed hot wire system i.e., the thermo-fluidic impulse response of a pulsed hot wire, a simulation model is going to be analyzed which describes the impulse response according to the physics from thermodynamics. The ...

Thermal Modelling of a Solar Water Collector Highly Building Integrated

F. Motte, and C. Cristofari
University of Corsica
Laboratory of Vignola
Ajaccio
Corsica, France

A new concept of solar water collector, highly building integrated has been developed and patented. This collector is hidden into a drainpipe and is totally invisible from the ground level. The drainpipe keeps its water evacuation function. Each installation is composed of several modules serial connected. An experimental wall has been build to test the thermal performances of the instalation ...

Comparison of 2D Conduction Models for Vertical Ground Coupled Heat Exchangers

A. Priarone[1], and S. Lazzari[2]
[1]DIPTEM-TEC, Università di Genova, Genova, Italia; Corresponding Author: a.priarone@unige.it
[2]DIENCA, Università di Bologna, Bologna, Italia

The effect of the infinite length approximation on evaluating the temperature of the surface of Borehole Heat Exchangers is determined by means of COMSOL Multiphysics. In detail, two 2D models of a BHE are compared: in the first model, the domain is represented by a cross-section of the geometry, while in the second model, it is represented by an axial-section of the geometry and, thus, the BHE ...

Perforation Effect on a Rectangular Metal Hydride Tank for Hydriding and Dehydriding Process

E. Gkanas[1][2], S. Makridis[1][2], E. Kikkinides[1], A. Stubos[2]
[1]Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece
[2]Environmental Laboratory, Institute of Nuclear Technology and Radiation Protection, NCSR 'Demokritos', Agia Paraskevi, Athens, Greece

Hydrogen storage in a metal hydride bed, uses an intermetallic alloy that can absorb efficiently high amounts of hydrogen by chemical bonding resulting to metal hydrides. This alloy is capable of absorbing and desorbing hydrogen while maintaining its own structure. The heat, mass and momentum transfer in a metal-hydride reactor is mathematically described by energy, mass and momentum balance ...

Modeling a Novel Shallow Ground Heat Exchanger

M. Bottarelli[1], M. Bortoloni[1]
[1]Università degli Studi di Ferrara, Dipartimento di Architettura, Ferrara, Italia

Ground Heat Exchangers (GHXs) are rarely installed horizontally in linked ground source heat pumps used for space conditioning, because their energetic performance is lower than in the vertical solution. However, the horizontal one holds several advantages: it is easy to carry out and upkeep, it is more compliant with environmental regulations, and interferes marginally with groundwater systems. ...

Modeling Thermal Bridging at Interface Conditions: Analysis of Solutions for Reducing Thermal Bridges Effects on Building Energy Consumption

C. Balocco[1], E. Marmonti[1]
[1]Dipartimento di Energetica, Università di Firenze, Firenze, Italy

In Europe considerable building activity can be expected over the coming decades; Net Zero Energy Buildings refers to a building with minimal power, until maximum 15 kW/m^2. In both cases this requires very well insulated buildings with minimal thermal bridges. Concrete balconies, that extend the floor slab through the building envelope, are a common example of thermal bridging, where structural ...

Optimization of Dynamic Embedded, Water Based Surface Heat (and Cold) Emitting System for Buildings

S. Thomas[1], P.Y. Franck[1], and P. André[1]
[1]Department of Sciences and Environmental Management, University of Liège, Arlon, Belgium

This paper presents the heat flow model and the experimental test bench developed to optimize a new kind of heating floor. In the first part of the text is described the new kind of high reactivity emitting device for building heating and cooling. The second part illustrates the numerical model developed to evaluate the device efficiency. Finally experimental test bench implementation and ...

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