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Magnetic cold storage device for magnetic refrigerator

A magnetic refrigerator and magnetic cold storage technology, which is applied to refrigerators, machines using electric/magnetic effects, refrigeration and liquefaction, etc., to achieve the effects of improving conversion efficiency, good economy, and compact structure

Inactive Publication Date: 2012-10-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Directional research on solving heat flow has not been reported

Method used

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  • Magnetic cold storage device for magnetic refrigerator
  • Magnetic cold storage device for magnetic refrigerator
  • Magnetic cold storage device for magnetic refrigerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] One of the embodiments of the thermal switch magnetic cold storage device of the magnetic refrigerator of the present invention is: a thermal diode is used as the thermal switch unit, such as image 3 shown. It is placed in the periodic magnetic field provided by the controllable magnetic field source 5 by the magnetic regenerator 3. The upper and lower ends of the magnetic regenerator 3 are respectively connected to a thermal diode 4a, 4b, wherein the evaporation section of the thermal diode 4a is placed in the magnetic regenerator. 3, the condensation section is set at the upper part of the magnetic cold storage 3 and contacts the heat source 7; the condensation section of the thermal diode 4b is placed inside the magnetic cold storage 3, and the evaporation section is set at the lower part of the magnetic cold storage 3 and is in contact with the cold source 6. At the same time, the magnetic cold storage The outer wall of the device 3 and the outer wall of the therma...

Embodiment 2

[0041] The second embodiment of the thermal switch magnetic cold accumulator of the magnetic refrigerator of the present invention is as follows: Figure 4 As shown, one end of the magnetic cold storage adopts a thermal diode type thermal switch, and the other end is connected with pipes, valves, pumps and heat exchangers to form a circulation circuit. It is placed in the periodic magnetic field provided by the controllable magnetic field source 5 by the magnetic regenerator 3. The lower end of the magnetic regenerator 3 is connected to the thermal diode 4, wherein the condensation section of the thermal diode 4 is located inside the magnetic regenerator 3, and its evaporation section is located in the magnetic regenerator. The lower part of the regenerator 3 is in contact with the cold source 6; the upper end of the magnetic regenerator 3 is connected to the pipeline 11, and forms a circulation circuit with the valve 10, the pump 9 and the heat exchanger 8, wherein the heat ex...

Embodiment 3

[0049] The following illustrates the structure of a thermal switch unit adopted by the device of the present invention, as Figure 5 shown. It is a slender, hollow, closed metal tube filled with working fluid. Figure 5 The inner wall of the thermal diode tube is a light pipe structure, and the outer wall of the upper and lower ends is a fin structure to enhance heat transfer. A capillary wick structure can also be arranged inside the heat pipe.

[0050] The tube wall of the heat pipe is made of metal materials such as stainless steel or copper, and the working medium in the tube can be fluids such as water, acetone, ammonia, and liquid nitrogen. The choice of working fluid should be based on the temperature range used by the heat pipe. On this premise, the compatibility between the working fluid and the tube wall and capillary core of the heat pipe should be stable, and it should have good thermal stability, high latent heat and thermal conductivity, and relatively low vis...

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Abstract

The invention discloses a thermal-switch magnetic cold storage device for a magnetic refrigerator. The device is arranged in a controllable magnetic field source and comprises a magnetic cold storage device which forms a heat transfer loop and a heat transfer assembly; the heat transfer assembly comprises at least one thermal switch unit; the magnetic cold storage device is a container filled with magnetic mediums; a portion of the thermal switch unit is arranged in the magnetic cold storage device to contact the magnetic mediums, and effectively enable the magnetic mediums to perform heat transport with the outside world during a magnetic field variation process. The thermal switch is a thermal diode, a superconductive switch or a heat transfer control device in the other modes; the magnetic mediums are solids, liquids or magnetic thermal materials in the other modes. The magnetic mediums give out heat to a heat source in a magnetizing stage and absorb heat from a cold source in a demagnetization stage by action of the controllable magnetic field so as to achieve the purpose of refrigeration. The device has good heat transport directivity and high-efficiency magnetic heat coupling mechanism; and the device has the advantages of high efficiency, compact structure, operation stability and good economical efficiency.

Description

technical field [0001] The invention belongs to the application field of clean energy magnetic refrigeration technology, and specifically relates to a magnetic cold storage device for a magnetic refrigerator, which can improve the energy conversion efficiency, reliability, economy and practicability of electromagnetic energy and thermal energy. Background technique [0002] Magnetic refrigeration is based on the application of the magnetocaloric effect (MCE) of magnetic materials in the field of refrigeration. The magnetocaloric effect is an inherent characteristic of magnetic materials. When the magnetic material is magnetized by the external magnetic field, the magnetic order of the system is strengthened (the magnetic entropy decreases), and it releases heat to the outside world; when the external magnetic field is removed and demagnetized, the magnetic order decreases (the magnetic entropy increases), absorb heat from the outside. The processes of excitation, heat abso...

Claims

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Application Information

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IPC IPC(8): F25B21/00
CPCY02B30/66Y02B30/00
Inventor 王惠龄李亮
Owner HUAZHONG UNIV OF SCI & TECH
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