Magnetic power conversion with machines containing full or porous wheel heat exchangers

A first part of the article contains a thermodynamic theory describing the temperature distribution in a Curie wheel. The occurring nonlinear ordinary differential equation has an analytical solution. If a Curie wheel is stabilized by levitation, it is named Palmy wheel. These wheels show a full structure, and because of this reason, their uptake of heat from a flame (Curie wheel) or by (solar) light absorption (Palmy wheel) only on the periphery of a cylinder is very limited. To improve the method, a modification of the principle by introducing a convective heat transport into a porous wheel is discussed. By this the power conversion rate from a heat flux to mechanical and electric power is very much increased. The second part of the article presents results of a theoretical/numerical study on the efficiencies of magnetic power conversion plants operating with porous wheels. Furthermore, these efficiencies which are promising-are compared with those of existing power conversion plants, as e.g. geothermal binary cycle power plants. (C) 2008 Published by Elsevier B.V.

Published in:
Journal Of Magnetism And Magnetic Materials, 321, 7, 758-762

 Record created 2015-10-20, last modified 2018-03-13

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