Dielectric refrigerator using orientable defect dipoles

Details Dielectric refrigerator using orientable defect dipoles Dielectric refrigerator using orientable defect dipoles

F - Mech Eng,Light,Heat,Weapons

25

B

327/3, 62/77

F25B 21/02 (2006.01) F25B 21/00 (2006.01) G21K 1/16 (2006.01)

Patent

CA 1100192

DIELECTRIC REFRIGERATOR USING ORIENTABLE DEFECT DIPOLES Abstract of the Disclosure This disclosure describes a dielectric refrigerator using orientable defect dipoles and operating between a high temperature, Th reservoir illustratively supplied by a Stirling cycle refrigerator (8°K ? Th ? 20°K) and a low temperature, T1, load, illustratively the liquid He cooling fluid for Josephson junction or other superconducting devices (2°K ? T1 ? 6°X). Exemplary practice of this invention provides cooling from the limit of a refrigerator based on the Stirling thermodynamic cycle (20 to 8°K) to operating temperatures of common and useful superconductive devices (3 to 6°K). Orientable electric dipoles of defects in electrically insulating materials, e.g., crystals, are utilized to provide cooling in the range from (8-20°K) to (2-6°K). The following are particular considerations concerning the practice of this invention: use of LiF, MgO and BeO as host crystals; use of OH and/or NH2 as defects in LiF, and use of HF, HC1, HBr and/or NH as defects in MgO or BeO; mechanical or electromechanical means to make and break thermal contact between dielectric crystal and load and between load and reservoir; and use of thermal rectifiers to obviate the need for YO976-038 thermal switches in order to transfer heat from the load to the refrigerator material and thence to the reservoir.

292048

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