Active magnetic refrigerator

Abstract

The invention relates to an active magnetic refrigerator includes separated hot and cold heat exchange units wherein a heat transfer fluid that exchanges a heat with a magnetic heat exchange unit having the magnetocaloric material pieces arranged to have a gap therebetween separately circulates through a solenoid valve.

Description

technical field [0001] The invention relates to an active magnetic refrigerator, which includes a separate heat exchange unit and a cold heat exchange unit. Background technique [0002] A conventional active magnetic refrigerator is disclosed in US Patent No. 6,826,915. like figure 1 As shown, (a) the temperature of the magnetic refrigeration material on which a magnetic field is applied increases from the dotted line to the solid line as the magnet moves to the right. (b) The temperature of the magnetic refrigeration material drops from the dotted line to the solid line as the heat transfer fluid on the cold side moves toward the hot side, and the heat transfer fluid is gradually heated to become hotter at the right Heat exchange to dissipate heat. (c) The temperature of the magnetic refrigeration material whose magnetic field has been eliminated further decreases from the dotted line to the solid line as the magnet moves to the left. (d) Due to the movement of the hea...

AI Technical Summary

Problems solved by technology

However, the high-temperature heat transfer fluid that has not passed through the hot side heat exchanger 70 is reversely circulated through the channel switch 30 to return to the AMR bed 10

Therefore, it is difficult to achieve the cooling effect

[0006] like image 3 As shown, since the magnetic heat exchange unit 10 includes the inlet 18a and the outlet 18b of the heat transfer fluid, when the channel switch 30 operates, the high temperature heat transfer fluid in the magnetic heat exchange unit cannot be used up due to the reverse circulation, so that the heat Decreased exchange efficiency

[0007] In addition, since the conventional active magnetic refrigerator uses a single heat transfer fluid, the amount of the heat transfer fluid passing through the hot side cannot be controlled, so that the heat of the magnetocaloric material 16 cannot be rapidly cooled, resulting in a decrease in heat exchange efficiency

[0008] In addition, since the fine mesh 16 is used at the outlet in order to prevent the loss of the powdery magnetocaloric material 16 due to the heat transfer fluid (coolant), this causes the coolant to not circulate smoothly.

[0009] Also, since the coolant continues to pass through the magnetocaloric material 16 at the same location, it is difficult to achieve smooth heat exchange

[0010] In addition, the microscopic size of the magnetocaloric material 16 may be lost when the coolant enters and exits the magnetocaloric unit 10

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