Microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator and heat transfer method thereof

Abstract

The invention discloses a microchannel enhanced heat exchange system of a rotary room-temperature magnetic refrigerator and a heat transfer method thereof. The system comprises a refrigerant disc, a cold end heat exchanger, a hot end heat exchanger and a solution pump, wherein the cold end heat exchanger and the hot end heat exchanger are connected with the refrigerant disc. the refrigerant disc comprises a refrigerant bed, an inner circle collecting tank, an outer circle collecting tank, four pairs of interzone adiabatic baffles and a plurality of intra-zone adiabatic baffles; the refrigerant bed comprises a plurality of trapezoidal microchannel flat tubes, an upper magnetic refrigerant plate and a lower magnetic refrigerant plate; the trapezoidal microchannel flat tubes, the upper magnetic refrigerant plate and the lower magnetic refrigerant plate are arranged between the inner circle collecting tank and the outer circle collecting tank; and the trapezoidal microchannel flat tubes are arranged between the upper magnetic refrigerant plate and the lower magnetic refrigerant plate. The heat transfer method is characterized in that the heat transfer fluid experiences a cycle of adiabatic excitation and demagnetization after passing through the different zones of the microchannel enhanced heat exchange system; and the rotary magnetic refrigerator recirculates the processes to realize refrigeration. In the invention, the characteristic that the microchannel can effectively enhance heat exchange due to scale effect is adopted and the microchannel is applied to the refrigerant bed, thus improving the efficiency of the refrigerating system and reducing corrosion of the heat transfer fluid to the magnetic refrigerant.

Description

Technical field [0001] The invention relates to the technical field of room temperature magnetic refrigeration and microchannel heat exchange, in particular to a microchannel enhanced heat exchange system of a rotary room temperature magnetic refrigerator. Background technique [0002] The emergence of magnetic refrigeration began with the discovery of the magnetocaloric effect 120 years ago, and began to be applied to cryogenic refrigeration in the 1930s. Since 1975, researchers from all over the world have been conducting experimental research on room temperature magnetic refrigeration. In 1976, G.V. Brown of the National Aeronautics and Space Administration first applied the magnetic refrigeration technology to the room temperature range, using metal gadolinium as the magnetic refrigeration working medium, and obtained a temperature difference of 47K under the condition of a 7T magnetic field and no thermal load. In December 1996, Carl Zimm, an engineer of American Aerospace ...

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Problems solved by technology

Technically, it is much more complicated than liquid-liquid or liquid-gas heat exchange, and the heat exchange efficiency is lower than them

The heat transfer of the magnetic working medium bed of the existing rotary and reciprocating prototype machines, whether it is a powdery working medium or a layered working medium, usually directly allows the heat exchange fluid (such as water, ethylene glycol solution, etc.) to flow through, There are defects such as large heat exchange resistance of solid working medium and heat exchange fluid, slow heat exchange speed during heat exchange, long refrigeration cycle, low cycle heat exchange efficiency, corrosion of magnetic working medium, etc.

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