Magnetic heat pumps and refrigerators are potential replacements for vapor-compression devices that use chlorofluorocarbon refrigerants. Several near-room-temperature designs with low-temperature superconducting magnets have reached the experimental-device stage. High-temperature superconducting materials should significantly enhance existing design concepts and may enable new design approaches such as those involving field switching of superconducting magnets to accomplish the thermodynamic cycle.

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2012-09-13

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