Coherent magneto-caloric effect superconductive heat engine process cycle
Author: Keefe, Peter D.1
Source: Journal of Modern Optics, Volume 50, Numbers 15-17, October, 2003 , pp. 2443-2454(12)
Publisher: Taylor and Francis Ltd
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Abstract:
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 T1 to a cycle low temperature T2, and a subsequent coherent magnetocaloric demagnetization process is predicted which heats the armature from T2 to an intermediate temperature T3, where T3<T2. A heat influx from an external high-temperature heat reservoir is required to achieve T1 and thereby to complete the cycle. As the temperature changes, the magnetic field is varied between a cycle low magnetic field H1 at T1 and a cycle high magnetic field H2 at T2, where the magnetodynamic work output is provided as the magnetic field is decreased from H2 to H1.Document Type: Research article
DOI: 10.1080/0950034032000120894
Affiliations: 1: Keefe and Associates 24405 Gratiot Avenue Eastpointe Michigan 48021 USA Keefengine.com, Email: PDK@ix.netcom.com
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