Method for torsion heat refrigeration using polydiurea elastomer fibers

Abstract

The method for twist heat refrigeration of polydiurea elastomer fiber belongs to the technical field of solid-state refrigeration. The molecular chain orientation degree of the fiber is changed by applying mechanical twist to the fiber, entropy change in the material is induced, and energy absorption and release are realized. The polydiurea elastomer fiber is fixed on a twist heat refrigeration performance test system, and is brought into a high torque state (heat release stage) by applying pre-stretching and torque. After heat exchange with the environment is balanced, the torque is quickly released to restore the fiber to the initial state (heat absorption stage), so that the cooling effect is generated. The polydiurea fiber has excellent elastic recovery rate, high mechanical strength and rich dynamic hydrogen bond, and the shortcomings of traditional elastomer materials, such as easy fatigue and small temperature change amplitude in the cyclic refrigeration process, are overcome. The method has the advantages of high refrigeration efficiency, environmental friendliness and compact structure, and has wide application prospects in the fields of miniaturized refrigeration equipment and wearable smart temperature regulating fabric.

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