Magnetic refrigeration system of multistage magnetic regenerator

Abstract

The invention provides a magnetic refrigeration system of a multistage magnetic regenerator. The magnetic refrigeration system comprises a magnetic body, a flow channel (2), a hot end heat exchanger (51), a cold end heat exchanger (52) and the multistage magnetic regenerator (1), wherein the multistage magnetic regenerator (1) comprises n magnetic regenerators (101,102,...1n) which are connected in series, n is an integer which is greater than 1, the first end of the multistage magnetic regenerator (1) are connected with an inlet and an outlet of the hot end heat exchanger (51) respectively through two flow channels (21, 22), and the second end of the multistage magnetic regenerator (1) are connected with an inlet and an outlet of the cold end heat exchanger (52) respectively through two flow channels (25, 26). The magnetic refrigeration system of the multistage magnetic regenerator has the advantage of high efficiency, the refrigeration loss caused by irreversible factors during backheating can be reduced, the refrigeration efficiency of fillers of the regenerators is fully improved, the internal heat transfer efficiency of the regenerators can be effectively improved, the large temperature span is established, and the enough refrigeration output of the system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of magnetic refrigeration, and in particular relates to a refrigeration system of a magnetic regenerator. Background technique [0002] Magnetic refrigeration technology is a solid-state refrigeration method based on the physical properties of materials. It uses water and other environmentally friendly media as heat transfer fluids. It usually has zero global warming potential, zero ozone depletion potential, intrinsically high efficiency, low noise and low vibration. . [0003] The magnetocaloric effect is a thermal effect in which the temperature of a magnetocaloric material increases when it enters a magnetic field and decreases when it is removed from the magnetic field. Materials with this thermal effect are called magnetocaloric materials, and magnetocaloric materials usually have the strongest magnetocaloric effect near their Curie temperature. In the magnetic refrigeration system, when a magnetic f...

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Problems solved by technology

However, the excitation and demagnetization process of the magnetic regenerator itself brings a temperature difference of 3-5K to the magnetic material, but because the flowing medium oscillates back and forth, the temperature difference itself is not enough, resulting in repeated temperature difference heat exchange in the regenerator, and the cold caused by the magnetic cooling effect. The amount cannot maintain the taste that it should have, and a lot of loss

In addition, the axial heat transfer of the oscillating medium and the magnetic material itself is greatly unfavorable for the establishment of the temperature gradient, resulting in too small a temperature difference between the two ends of the magnetic regenerator, and the magnetic refrigeration temperature span is limited.

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