Search

Your search keyword '"Cyrill Gonin"' showing total 2 results
Start Over Author "Cyrill Gonin" Search Limiters Peer Reviewed
2 results on '"Cyrill Gonin"'

1. Modeling and Simulation of the Operation of a Rotary Magnetic Refrigerator

Author

Didier VUARNOZ, Andrej KITANOVSKI, Cyrill GONIN, Peter W. EGOLF, and Tsuyoshi KAWANAMI

Subjects
magnetic refrigerator, modelling, simulation, Mechanical engineering and machinery, TJ1-1570, Mechanics of engineering. Applied mechanics, TA349-359
Abstract

Magnetic refrigeration is a new environmentally benign technology and a promising alternative to conventional vapor-cycle refrigeration. Among these technologies the household refrigerator without a freezing compartment shows very good prospects for a successful application. This article starts with the general principle of magnetic refrigeration and then also describes the maximum specific cooling capacity of magneto caloric materials. The specific cooling power of a magnetocaloric material is found to be large even for medium magnetic field changes, especially if the frequency is not too small. For a domestic magnetic refrigerator, a comparison with a standard compressor refrigerator is presented. The modeling of a rotary magnetic refrigerator is described and its dynamic behavior is investigated. The physical model is based on a mapping of the magneto-thermodynamic problem from a cylinder onto two rectangles. In this model, in a basic centre cell, two coupled linear partial differential equations are solved, which have been programmed in the Modelica language. Steady-state solutions are envisaged to determine the coefficient of performance, COP, for these conditions. In future work the developed model shall be applied for an optimization of the magnetic refrigerator and to determine the related best parameters.

Published
2011
Full Text
View/download PDF

2. Quantitative feasibility study of magnetocaloric energy conversion utilizing industrial waste heat

Author

Peter W. Egolf, M. Delessert, Cyrill Gonin, Didier Vuarnoz, Y. Borgeaud, Andrej Kitanovski, and M. Meinen

Subjects
Exergy, Thermal efficiency, Materials science, Magnetic energy, business.industry, Mechanical Engineering, Energy conversion efficiency, Mechanical engineering, Building and Construction, Management, Monitoring, Policy and Law, Heat sink, General Energy, Waste heat, Thermodynamic cycle, Energy transformation, Process engineering, business
Abstract

The main objective of this theoretical study was to investigate under which conditions a magnetic energy conversion device (MECD) - utilizing industrial waste heat - is economically feasible. Furthermore, it was evaluated if magnetic energy conversion (MCE) has the potential of being a serious concurrent to already existing conventional energy conversion technologies. Up-today the availability of magnetocaloric materials with a high Curie temperature and a high magnetocaloric effect is rather limited. Therefore, this study was mainly focused on applications with heat sources of low to medium temperature levels. Magnetic energy conversion machines, containing permanent magnets, are numerically investigated for operation conditions with different temperature levels, defined by industrial waste heat sources and environmental heat sinks, different magnetic field intensities and different frequencies of operation (number of thermodynamic cycles per unit of time). Theoretical modeling and numerical simulations were performed in order to determine thermodynamic efficiencies and the exergy efficiencies as function of different operation conditions. From extracted data of our numerical results, approximate values of the total mass and total volume of magnetic energy conversion machines could be determined. These important results are presented dependent on the produced electric power. An economic feasibility study supplements the scientific study. It shows an excellent potential of profitability for certain machines. The most important result of this article is that the magnetic energy conversion technology can be economically and technically competitive to or even beat conventional energy conversion technologies. This is true especially in those cases when large, low-exergy heat sources are at one's disposal. (C) 2012 Elsevier Ltd. All rights reserved.

Published
2012
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results