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Coherent magneto-caloric effect superconductive heat engine process cycle

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A heat engine process cycle is proposed in which an armature, composed of a type I superconductor material, is magnetocalorically and magnetodynamically processed in magnetic field-temperature (H-T) space. Provided that the diameter d of the armature is defined by ξ(T) ≥ d ≥ 5λ(T), then a coherent magnetocaloric magnetization process is predicted which refrigerates the armature from a cycle high temperature T 1 to a cycle low temperature T 2, and a subsequent coherent magnetocaloric demagnetization process is predicted which heats the armature from T 2 to an intermediate temperature T 3, where T 3<T 2. A heat influx from an external high-temperature heat reservoir is required to achieve T 1 and thereby to complete the cycle. As the temperature changes, the magnetic field is varied between a cycle low magnetic field H 1 at T 1 and a cycle high magnetic field H 2 at T 2, where the magnetodynamic work output is provided as the magnetic field is decreased from H 2 to H 1.
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Document Type: Research Article

Affiliations: Keefe and Associates 24405 Gratiot Avenue Eastpointe Michigan 48021 USA, Email: [email protected]

Publication date: October 1, 2003

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