CN101788207A - Microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator and heat transfer method thereof - Google Patents
Microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator and heat transfer method thereof Download PDFInfo
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- CN101788207A CN101788207A CN200910214358A CN200910214358A CN101788207A CN 101788207 A CN101788207 A CN 101788207A CN 200910214358 A CN200910214358 A CN 200910214358A CN 200910214358 A CN200910214358 A CN 200910214358A CN 101788207 A CN101788207 A CN 101788207A
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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
The present invention relates to room temperature magnetic refrigerating and Thermal Performance of Micro Channels technical field, specifically be meant the microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator.
Background technology
The appearance of magnetic refrigeration originates in the discovery of magnetothermal effect before 120 years, and last century the '30s begin to be applied to cryogenic refrigeration.Since 1975, the researcher of countries in the world is at the experimental study that carries out room temperature magnetic refrigerating.1976, the G.V.Brown of US National Aeronautics and Space Administration was applied to room temperature range with the magnetic Refrigeration Technique first, adopted the metal gadolinium as magnetic refrigeration working substance, had obtained the temperature difference of 47K under the condition of the magnetic field of 7T and no thermic load.In December, 1996, the engineer Carl Zimm of Astronics Corp adopted active magnetic regenerator (AMR) technology, had set up a magnetic refrigerator, had obtained the refrigerating capacity of 500～600W under the magnetic field of 5T, had obtained breakthrough in room temperature magnetic refrigerating model machine field.At present, the effective heat exchange problem in the room temperature magnetic refrigerating cyclic process has become one of key technology of restriction magnetic refrigeration.
Magnetic refrigerating material is a kind of solid matter.In order to finish the kind of refrigeration cycle process, must there be a kind of liquid medium (or gaseous medium) to carry out heat exchange with magnetic refrigerating material, this is the heat exchange method of solid-liquid or solids-gases.Technically, than liquid-liquid or liquid---gas heat exchange method complexity many, and heat exchanger effectiveness is also low than them.The heat transfer of the working medium bed of magnetic of existing rotary and reciprocating type model machine, no matter be the Powdered working medium or the working medium of stratiform, usually employing directly allows heat exchanging fluid (as water, ethylene glycol solution etc.) flow through, exist the heat exchange resistance of solid working medium and heat exchanging fluid big, rate of heat exchange is slow in the heat transfer process, the refrigeration cycle is long, and cycle heat exchange efficient is low, to the defectives such as corrosion of magnetic working medium.Therefore, the heat transfer efficiency that how to improve magnetic working medium and heat exchanging fluid is the key that improves the magnetic refrigerating efficiency.
Since the 1980s, the Thermal Performance of Micro Channels technology constantly develops.Thermal Performance of Micro Channels is used for other refrigeration system such as common vapour compression refrigeration system improves refrigeration system efficient, because Thermal Performance of Micro Channels is effective, micro-channel heat exchanger is used for substituting common heat exchanger in air conditioning for automobiles, domestic air conditioning become a kind of trend.Micro-channel heat exchanger has following characteristics: (1) is simple in structure.Micro-channel heat exchanger mainly adopts simple channel design such as rectangle, triangle, circular fin; (2) volume is little, and flow is little, can directly act on millimeter even micron-sized heat source position; (3) micro-channel heat exchanger is owing to the dimensional effect of passage, and thermal resistance is very low, can directly act on heat source position again simultaneously, so heat exchange efficiency is very high; (4) working stability is reliable.And comparatively ripe microchannel process technology is arranged at present, thereby micro-channel heat exchanger can be used for the working medium bed of rotary type magnetic refrigerating device fully, to reach the purpose of enhanced heat exchange and its refrigerating efficiency of raising.
Summary of the invention
The objective of the invention is shortcoming at prior art, a kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator is provided, can reduce heat exchanging fluid with the process of magnetic working medium heat exchange in flow resistance, thereby improve the efficient of rotary room-temperature magnetic refrigerator, magnetic working medium heat-exchange system compactness can reduce the use amount of heat exchanging fluid.
The object of the invention is achieved through the following technical solutions:
A kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator, comprise working medium dish and the cool end heat exchanger that is attached thereto, hot end heat exchanger and solution pump, cool end heat exchanger links to each other with the cold junction gateway of working medium dish, and hot end heat exchanger links to each other with the hot end heat exchanger gateway of working medium dish by solution pump, the working medium dish comprises working medium bed, the inner ring collecting tank, the outer ring collecting tank, thermal baffle in the four pairs of interval thermal baffles and the polylith district, four pairs of interval thermal baffles are divided into the one-level field regions with described working medium dish, transition region, the secondary field regions, cold-zone four parts, it is characterized in that: the described working medium bed many trapezoidal microchannel flat tubes that comprise, last magnetic working medium plate and following magnetic working medium plate, trapezoidal microchannel flat tube, last magnetic working medium plate and following magnetic working medium plate are between inner ring collecting tank and outer ring collecting tank, and trapezoidal microchannel flat tube places up and down between two magnetic working medium plates.
On a kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator in, described many trapezoidal microchannel flat tubes are evenly distributed on up and down between two magnetic working medium plates, inner ring collecting tank and outer ring collecting tank are communicated with by trapezoidal microchannel flat tube.
On a kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator in, described four pairs of interval thermal baffles lay respectively between one-level field regions and transition region, between transition region and the secondary field regions, between secondary field regions and the cold-zone, between cold-zone and the one-level field regions, to the working medium bed heat-blocking action of respectively having distinguished; Thermal baffle is positioned at and has respectively distinguished the mobile and heat insulation effect of guiding heat-transfer fluid in the described polylith district.
On a kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator in, described two-layer magnetic working medium plate up and down is the annulus thin plate, the trapezoidal microchannel flat tube in intermediate layer and two-layer up and down magnetic working medium plate form one by adhesive through pressure method.
On a kind of microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator in, the microchannel enhanced heat exchange system of described a kind of rotary room-temperature magnetic refrigerator adopts water or ethylene glycol solution as heat-transfer fluid.
Adopt the heat-transferring method of the microchannel enhanced heat exchange system of above-mentioned rotary room-temperature magnetic refrigerator, be meant described working medium bed when entering in the magnetic field, the heat exchanging fluid that comes out from cool end heat exchanger enters the secondary field regions through the cool end heat exchanger outlet, absorb magnetic working medium excitation liberated heat, then enter the one-level field regions and continue heat absorption, flow into hot end heat exchanger heat exchange cooling through the hot end heat exchanger inlet with solution pump again through one-level field regions inlet; Working medium bed when leaving magnetic field, the heat exchanging fluid after hot end heat exchanger heat exchange cooling enters the cold-zone by the hot end heat exchanger outlet, absorbs in the cold-zone magnetic working medium because of the cold of demagnetization generation; After the cooling, flow into the cool end heat exchanger inlet, absorb heat from environment; So far, magnetic working medium has experienced adiabatic excitation and demagnetization process, has finished the course of work of a cycle period, then repeats said process again, enters second cycle period; Rotary type magnetic refrigerating device circulates and so forth and realizes refrigeration.
Compared with prior art, the microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator of the present invention is simple in structure, the effective and reasonable heat exchange area that utilizes the working medium dish, heat exchanging fluid is evenly flowed, reduce the corrosion of heat exchanging fluid to magnetic working medium, guarantee the safe and effective operation of rotary type cold machine, improve rotary room-temperature magnetic refrigerated medium cooling system efficient and refrigerating capacity.The dischargeable capacity of rotary room-temperature magnetic refrigeration magnetic working medium dish of the present invention is rationally utilized, and the resistance when heat exchanging fluid and the heat exchange of magnetic working medium reduces, and the heat exchange effect is more obvious, has improved the service efficiency of magnetic working medium and heat exchanging fluid.The processing technology of the microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator of the present invention is simple, good reliability, and stability is high, can improve the competitiveness of room temperature magnetic refrigerating effectively.The microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator of the present invention has solved because heat exchanging fluid influences heat exchange efficiency owing to flow resistance increases when flowing through working medium plate surface, reduces problems such as magnetic refrigerating system efficient.
Description of drawings
Fig. 1 is the vertical view of the trapezoidal microchannel flat tube arrangement of working medium dish;
Fig. 2 is the principle schematic of rotary room-temperature magnetic refrigerator;
Fig. 3 is working medium bed part sectioned view;
Fig. 4 is the working medium bed partial structurtes figure of Fig. 3 after amplifying.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
As shown in figures 1 and 3, the microchannel enhanced heat exchange system of rotary room-temperature magnetic refrigerator, comprise by the working medium dish of formations such as thermal baffle 6 in the trapezoidal microchannel of one deck flat tube 1, two-layer magnetic working medium plate 2 (2 are lower floor's magnetic working medium plate among Fig. 1), inner ring collecting tank 3, outer ring collecting tank 4, the four pairs of interval thermal baffles 5, the polylith district and the cool end heat exchanger that is attached thereto and hot end heat exchanger, solution pump and forming.Upper strata magnetic working medium plate 201, lower floor's magnetic working medium plate 2 are processed into the annulus thin plate, 1 of the trapezoidal microchannel flat tube in intermediate layer adopts existing surperficial micro-processing technology to process through oxide etch on silicon base 13 surfaces, adopt adhesive 14 to be processed as working medium bed (, being the working medium bed partial structurtes figure after amplifying) with three layers then as Fig. 4 through pressure method.Consider the needs of refrigerating capacity, working medium bed can be by multilayer magnetic working medium plate and alternately laminated the forming of trapezoidal microchannel flat tube.
As embodiment, as shown in Figure 2, working medium bed position according to magnetic field is divided into four parts, be one-level field regions (scope shown in 70 ° is interior on the right of among Fig. 2), transition region (scope shown in 80 ° is interior among the figure), secondary field regions (the 70 ° of scopes in the left side are interior among the figure), cold-zone (scope shown in 140 ° is interior among the figure).The operation principle of the microchannel enhanced heat exchange system of room-temperature magnetic refrigerator is: working medium bed when entering in the magnetic field, the heat exchanging fluid that comes out from cool end heat exchanger enters the secondary field regions through cool end heat exchanger outlet 8, absorb magnetic working medium excitation liberated heat, then enter the one-level field regions and continue heat absorption, flow into hot end heat exchanger heat exchange cooling through hot end heat exchanger inlet 11 with solution pump again through one-level field regions inlet 10; Working medium bed when leaving magnetic field, the heat exchanging fluid after hot end heat exchanger heat exchange cooling enters the cold-zone by hot end heat exchanger outlet 12, absorbs in the cold-zone magnetic working medium because of the cold of demagnetization generation; After the cooling, flow into cool end heat exchanger inlet 7, absorb heat from environment; So far, magnetic working medium has experienced adiabatic excitation and demagnetization process, has finished the course of work of a cycle period, then repeats said process again, enters second cycle period; Rotary type magnetic refrigerating device circulates and so forth and realizes refrigeration.
The effective and reasonable heat exchange area that utilizes the working medium dish of microchannel enhanced heat exchange system energy of room-temperature magnetic refrigerator of the present invention, and combine the advantage of Thermal Performance of Micro Channels, owing to adopted trapezoidal microchannel flat tube, resistance when heat exchanging fluid and the heat exchange of magnetic working medium reduces, the heat exchange effect is more obvious, has improved the service efficiency and the heat exchange efficiency of magnetic working medium and heat exchanging fluid, thereby makes the system architecture compactness, guarantee the safe and effective operation of rotary room-temperature magnetic refrigerating system, improve refrigeration system efficient.As above can implement the present invention preferably.
Claims (7)
1. the microchannel enhanced heat exchange system of a rotary room-temperature magnetic refrigerator, comprise working medium dish and the cool end heat exchanger that is attached thereto, hot end heat exchanger and solution pump, cool end heat exchanger links to each other with the cold junction gateway of working medium dish, and hot end heat exchanger links to each other with the hot end heat exchanger gateway of working medium dish by solution pump, the working medium dish comprises working medium bed, inner ring collecting tank (3), outer ring collecting tank (4), thermal baffle (6) in four pairs of interval thermal baffles (5) and the polylith district, four pairs of interval thermal baffles (5) are divided into the one-level field regions with described working medium dish, transition region, secondary field regions and cold-zone, it is characterized in that: the described working medium bed many trapezoidal microchannel flat tubes (1) that comprise, last magnetic working medium plate and following magnetic working medium plate, trapezoidal microchannel flat tube (1), last magnetic working medium plate and following magnetic working medium plate are positioned between inner ring collecting tank (3) and the outer ring collecting tank (4), and trapezoidal microchannel flat tube (1) places up and down between two magnetic working medium plates.
2. the microchannel enhanced heat exchange system of a kind of rotary room-temperature magnetic refrigerator according to claim 1, it is characterized in that: described many trapezoidal microchannel flat tubes (1) are evenly distributed on up and down between two magnetic working medium plates, and inner ring collecting tank (3) and outer ring collecting tank (4) are by trapezoidal microchannel flat tube (1) connection.
3. the microchannel enhanced heat exchange system of a kind of rotary room-temperature magnetic refrigerator according to claim 1, it is characterized in that: described four pairs of interval thermal baffles (5) lay respectively between one-level field regions and transition region, between transition region and the secondary field regions, between secondary field regions and the cold-zone, between cold-zone and the one-level field regions, to the working medium bed heat-blocking action of respectively having distinguished; Thermal baffle (6) is positioned at and has respectively distinguished the mobile and heat insulation effect of guiding heat-transfer fluid in the described polylith district.
4. the microchannel enhanced heat exchange system of a kind of rotary room-temperature magnetic refrigerator according to claim 1, it is characterized in that: described two-layer magnetic working medium plate up and down is the annulus thin plate, and the trapezoidal microchannel flat tube (1) in intermediate layer and two-layer up and down magnetic working medium plate form one by adhesive through pressure method.
5. the microchannel enhanced heat exchange system of a kind of rotary room-temperature magnetic refrigerator according to claim 1 is characterized in that adopting water or ethylene glycol solution as heat-transfer fluid.
6. according to the microchannel enhanced heat exchange system of each described a kind of rotary room-temperature magnetic refrigerator of claim 1～5, it is characterized in that: described working medium bed by multilayer magnetic working medium thin plate and alternately laminated the forming of trapezoidal microchannel flat tube.
7. adopt the heat-transferring method of the microchannel enhanced heat exchange system of each described a kind of rotary room-temperature magnetic refrigerator of claim 1 to 6, it is characterized in that: described working medium bed when entering in the magnetic field, the heat exchanging fluid that comes out from cool end heat exchanger enters the secondary field regions through cool end heat exchanger outlet (8), absorb magnetic working medium excitation liberated heat, then enter the one-level field regions and continue heat absorption, flow into hot end heat exchanger heat exchange cooling through hot end heat exchanger inlet (11) with solution pump again through one-level field regions inlet (10); Working medium bed when leaving magnetic field, the heat exchanging fluid after hot end heat exchanger heat exchange cooling enters the cold-zone by hot end heat exchanger outlet (12), absorbs in the cold-zone magnetic working medium because of the cold of demagnetization generation; After the cooling, flow into cool end heat exchanger inlet (7), absorb heat from environment; So far, magnetic working medium has experienced adiabatic excitation and demagnetization process, has finished the course of work of a cycle period, then repeats said process again, enters second cycle period; Rotary type magnetic refrigerating device circulates and so forth and realizes refrigeration.
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