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Magnetic refrigeration working medium bed and preparation method

A magnetic refrigeration and working fluid bed technology, which is applied to the magnetic refrigeration working fluid bed and its preparation, and the magnetic refrigeration working fluid bed and its preparation field, can solve the problem of impossible refrigeration temperature span, large longitudinal heat leakage, and magnetic refrigeration working fluid bed. Problems such as the decrease of heat transfer specific surface area

Active Publication Date: 2013-10-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these material systems have a common problem: after many cycles of magnetic refrigeration, the magnetic refrigerant that has been made into a certain shape will be severely pulverized, and the stronger the first-order phase transition, the more serious the pulverization
The disadvantage of this method is: on the one hand, due to the limitation of the material properties of a single material, on the other hand, the heat transfer specific surface area of ​​the magnetic refrigerant bed is greatly reduced and the longitudinal heat leakage is large, which will reduce the efficiency of the magnetic refrigerator. And it is impossible to achieve a practical refrigeration temperature span, and this method is not suitable for other difficult-to-form magnetic refrigeration material systems

Method used

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  • Magnetic refrigeration working medium bed and preparation method
  • Magnetic refrigeration working medium bed and preparation method
  • Magnetic refrigeration working medium bed and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: The preparation of the present invention is used to realize the active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 25°C.

[0038] 1) Preparation of magnetic refrigeration powder materials:

[0039] Preparation of La(FeSi) with a Curie point temperature of 27.5°C 13 h 1.5 Magnetic refrigeration powder materials;

[0040] 2) Preparation of sheet magnetic refrigerant bed components:

[0041] La(FeSi) 13 h 1.5 The magnetic refrigeration powder material is evenly immersed in the phenolic bonding colloid to obtain the La(FeSi)-containing 13 h 1.5 A mixture of magnetic refrigeration powder material and phenolic bonding colloid, the content of the phenolic bonding colloid accounts for 10%wt of the weight of the mixture; the mixture is then packed into a mold and compacted into a flat surface with a thickness of 0.5 mm Straight flakes 1 (as in Figure 2a shown) and flat ...

Embodiment 2

[0043] Example 2: The preparation of the present invention is used to realize the active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 5°C.

[0044] 1) Preparation of magnetic refrigeration powder materials:

[0045] Designed according to the requirements of the magnetic refrigerator and changing the content of the gap H by adjusting the hydrogen absorption process to prepare 10 kinds of magnetic refrigeration powder materials with a Curie point temperature from 7.5°C to 30°C (the interval is 2.5°C): La(FeSi) 13 h 1.05 , La(FeSi) 13 h 1.1 , La(FeSi) 13 h 1.15 , La(FeSi) 13 h 1.2 , La(FeSi) 13 h 1.25 , La(FeSi) 13 h 1.3 , La(FeSi) 13 h 1.35 , La(FeSi) 13 h 1.4 , La(FeSi) 13 h 1.45 and La(FeSi) 13 h 1.5 ;

[0046] 2) Preparation of sheet magnetic refrigerant bed components:

[0047] Each magnetic refrigeration powder material was evenly immersed in the epoxy resin bonding...

Embodiment 3

[0050] Embodiment 3: The present invention is used to realize an active magnetic regenerating magnetic refrigeration working medium bed with an ambient temperature of 30°C and a refrigeration temperature of 25°C.

[0051] 1) Preparation of magnetic refrigeration powder materials:

[0052] Design according to the requirements of the magnetic refrigerator and change the content of gap C and H by adjusting the hydrogen absorption process to prepare La(FeSi) with a Curie point temperature of 27.5°C 13 C 0.2 h 1.5 Magnetic refrigeration powder materials;

[0053] 2) Preparation of sheet magnetic refrigerant bed components:

[0054] La(FeSi) 13 C 0.2 h 1.5 The magnetic refrigeration powder material is uniformly immersed in the phenolic bonding colloid to obtain La(FeSi) 13 C 0.2 h 1.5 A mixture of magnetic refrigeration powder material and phenolic bonding colloid; the content of the phenolic bonding colloid accounts for 5% of the weight of the mixture; then the mixture is ...

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Abstract

The present invention provides a magnetic refrigerant bed, which is a column composed of n magnetic refrigerant bed components, and these n magnetic refrigerant bed components are arranged in a descending order according to Curie temperatures or phase transition temperatures of the magnetic refrigeration materials used, wherein n=1-1000. The magnetic refrigerant bed components are flat sheets (1), straight wave-shaped sheets (2) or zigzag wave-shaped sheets (3) which can easily form a magnetic refrigerant bed with high specific surface area and flow channels of low resistance. And a method for manufacturing a magnetic refrigerant bed is also provided, which comprises the following steps: preparing magnetic refrigeration powder materials with Curie temperatures or phase transition temperatures in the operating temperature range of a magnetic refrigerator; and immersing the magnetic refrigeration powder materials into binder respectively; then loading the mixture into molds respectively and pressing the mixture into sheet magnetic refrigerant bed components; then arranging and assembling the obtained components in a descending order according to Curie temperatures or phase transition temperatures of the used magnetic refrigeration materials to obtain a columnar magnetic refrigerant bed. The magnetic refrigerant bed has advantages of large heat transfer specific surface area and small flow resistance of the refrigerant.

Description

field of invention [0001] The invention belongs to the field of refrigeration and cryogenic engineering, and in particular relates to a magnetic refrigeration working medium bed and a preparation method, that is, a magnetic refrigeration working medium bed with a certain shape and structure made of powder magnetic refrigeration materials according to the use requirements of a magnetic refrigerator and its preparation method. Background technique [0002] Refrigeration equipment such as air conditioners and refrigerators are widely used in people's daily life and have become a necessity in modern society. At present, traditional vapor compression cycle refrigeration technology is mainly used. Its technology is mature and its application is wide. The destructive effects (main indicators: ozone destruction coefficient (ODP) and greenhouse effect coefficient (GWP)) have been concerned by the world for nearly three decades, and scientists and engineers from various countries are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B21/00
CPCF25B21/00F25B2321/002Y02B30/66F25B2500/01Y10T29/49359Y02B30/00
Inventor 沈俊吴剑峰沈保根公茂琼戴巍
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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