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| Ceramic materials have been developed with superior, perfectly reversible electrocaloric cooling properties over a wide temperature range near room temperature. Electrocaloric heating and cooling occur when an electric field (voltage) is applied to a material (causing heating), and then removed (causing cooling). If this cycle is used with an appropriate heat switch, the cycle can be used for refrigeration. This process can be very efficient, resulting in significantly lower refrigeration operating costs. Previous materials show, at best, temperature swings on the order of 0.01 C with voltage cycling at room temperature. The new materials have shown temperature swings up to 4 C with the possibility of increasing these swings to 10 C or more. In practice, the materials are made into multilayer capacitors with thin layers. Repeat cycling of a bank of these capacitors could drop the temperature of a heat load (e.g. a freezer compartment in a refrigerator) from well above room temperature to well below freezing. Another possible use for the materials is as active regenerators for Stirling cycle coolers. Here the electrocaloric materials would replace the large heat capacity regenerators commonly used. The charge/discharge cycles would be timed with the compression/decompression cycles to enhance the cooling. A comprehensive White Paper is available upon request. |
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