EP1422484B1 - Regenerator, and heat regenerative system for fluidized gas using the regenerator - Google Patents
Regenerator, and heat regenerative system for fluidized gas using the regenerator Download PDFInfo
- Publication number
- EP1422484B1 EP1422484B1 EP02796355A EP02796355A EP1422484B1 EP 1422484 B1 EP1422484 B1 EP 1422484B1 EP 02796355 A EP02796355 A EP 02796355A EP 02796355 A EP02796355 A EP 02796355A EP 1422484 B1 EP1422484 B1 EP 1422484B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- regenerator
- resin film
- heat
- resin
- working gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
- F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
- F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
- F28D19/042—Rotors; Assemblies of heat absorbing masses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/057—Regenerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
- F28D17/02—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles using rigid bodies, e.g. of porous material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/003—Gas cycle refrigeration machines characterised by construction or composition of the regenerator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
Definitions
- the present invention relates to a regenerator for use in a Stirling-cycle refrigerator or the like, and relates also to a flow gas heat regeneration system employing such a regenerator
- a type of conventional regenerator 1 for use in a Stirling-cycle refrigerator is, for example as shown in Fig. 8, composed of a resin film 2, having fine projections 2a formed on the surface thereof, rolled into a cylindrical shape with a hollow space left inside it.
- Fig. 9 is a side sectional view of an example of a free-piston-type Stirling-cycle refrigerator incorporating the regenerator 1.
- the free-piston-type Stirling-cycle refrigerator includes a cylinder 8 having a working gas such as helium sealed therein, a displacer 7 and a piston 5 arranged so as to divide the space inside the cylinder 8 into an expansion space 10 and a compression space 9, a linear motor 6 for driving the piston 5 to reciprocate, a heat absorber 14 provided on the expansion space 10 side for absorbing heat from outside, and a heat rejector 13 disposed on the compression space 9 side for rejecting heat to outside.
- reference numerals 11 and 12 represent plate springs that support the displacer 7 and the piston 5, respectively, and permit them to reciprocate by resilience.
- Reference numeral 15 represents a heat rejecting heat exchanger
- reference numeral 16 represents a heat absorbing heat exchanger. These heat exchangers prompt exchange of heat between inside and outside the refrigerator. Between the heat rejecting heat exchanger 15 and the heat absorbing heat exchanger 16, a regenerator 1 is disposed.
- the working gas that has flowed into the expansion space 10 is under high pressure, and is expanded when the displacer 7, which reciprocates with a predetermined phase difference kept relative to the piston 5, moves down. Meanwhile, the temperature of the working gas falls, but the working gas is heated through absorption of heat from the outside air by the heat absorber 14 through the heat absorbing heat exchanger 16. Thus, isothermal expansion is achieved. Thereafter, the displacer 7 starts moving up, and thus the working gas in the expansion space 10 flows through the regenerator 1 back into the compression space 9. Meanwhile, the working gas receives the heat stored in the regenerator 1, and thus the temperature of the working gas rises.
- This sequence of operations called the Stirling cycle, is repeated by the reciprocating movement of the driven components, with the result that the heat absorber 14 absorbs heat from the outside air and gradually becomes cold.
- an object of the present invention is to provide a regenerator that offers excellent heat energy regeneration efficiency and stable regeneration performance.
- DE 3240598 discloses a rotating heat recovery device which has a matrix formed from plastic. Dimensions of the matrix are adapted to specific dimensional parameters, and the matrix strip is equipped with transverse bulges which have a length that is less than the strip width, in order to permit a wind-up tension to act on the strip without influencing the dimensions of the bulges.
- the dimensional parameters permitted by the use of plastic permit the production of matrix discs having a minimum thickness which reduces the circumferential leakage loss.
- a regenerator composed of a strip-shaped resin film rolled into a cylindrical shape, the resin film has a multiple layer structure at least in a portion thereof occupying a predetermined width from an edge thereof. This helps increase the strength of the edges of the regenerator so that they are less prone to deformation, and thus helps stabilise the performance of the regenerator.
- the layer having high thermal conductivity formed on the resin film enhances heat conduction in the regenerator. Thus, more heat is stored in the resin film.
- the layer having high thermal conductivity formed on the resin film enhances heat conduction in the regenerator 1 and provides higher heat capacity. Thus more heat is rejected to the working gas. In this way, it is possible to achieve high heat energy regeneration efficiency.
- the resin film may have a plurality of fine projections formed on the surface thereof. This leaves gaps between different turns of the resin film laid on one another, and thus permits the working gas to flow through those gaps from the high-temperature end to the low-temperature end and vice versa along the cylinder axis.
- the regenerator composed of a strip-shaped resin film rolled into a cylindrical shape
- the resin film is composed of two strip-shaped resin films having a layer with higher thermal conductivity than the two resin films laminated between the two resin films. This helps avoid exposing the layer having high thermal conductivity to outside.
- the layer having high thermal conductivity on the resin film helps reduce the area, and this the material costs and the like, of the layer having high thermal conductivity compared with a case where the layer having high thermal conductivity is formed all over the resin film.
- the layer having high thermal conductivity can be formed easily by being printed on the resin film as resin ink containing an ingredient having high thermal conductivity.
- suitable as the ingredient having high thermal conductivity is fine particles of at least one of gold, silver, copper, aluminium, and carbon.
- regenerator of the present invention By disposing the regenerator of the present invention in a doughnut-shaped space serving as a flow pass for a reciprocating gas, it is possible to realise a versatile flow gas heat regeneration system that offers high heat energy regeneration efficiency.
- the present invention by applying the present invention to a free-piston-type Stirling-cycle refrigerator, it is possible to achieve excellent refrigerating performance.
- Fig. 1 is a perspective view showing the structure of the regenerator of the first embodiment of the invention
- Fig. 2 is an enlarged sectional view of the regenerator.
- the regenerator 1 is composed of a strip-shaped resin film 2 rolled into a cylindrical shape.
- the resin film 2 is formed out of a material having high specific heat, low thermal conductivity, high heat resistance, low moisture absorption, and other desirable properties, suitable examples including polyethylene terephthalate (PET) and polyimide.
- the resin film 2 has a plurality of fine projections 2a formed regularly all over one surface thereof. These projections 2a can be formed, for example, by printing, embossing, or heat forming. As shown in Fig. 2, the projections 2a permit gaps to be left between different turns of the resin film 2 laid on one another. Thus, through these gaps, as shown in Fig. 1, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B).
- resin layers 3 containing an ingredient having higher thermal conductivity than the resin film 2 are formed as thin films.
- Suitable as the ingredient having high thermal conductivity is fine particles of gold, silver, copper, aluminum, carbon, or the like used singly or as a mixture of two or more of them.
- the fine particles are mixed with a resin material such as polyethylene, and the mixture is then printed, as ink, on both surfaces of the resin film 2 to coat it with the resin layers 3.
- Fig. 3 is a perspective view showing the structure of the regenerator of the second embodiment of the invention.
- the resin film 2 has a plurality of fine projections 2a formed regularly all over one surface thereof These projections 2a permit gaps to be left between different turns of the resin film 2 laid on one another. Thus, through these gaps, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B).
- resin layers 3 containing an ingredient having higher thermal conductivity than the resin film 2 are formed in the shape of stripes arranged at regular intervals along the cylinder axis.
- masks are laid beforehand in the shape of stripes arranged at regular intervals. Then, coating is performed just as in the first embodiment. Lastly, the masks are washed off and removed to obtain the resin layers 3.
- the stripes of the resin layers 3 may be arranged at irregular intervals.
- the resin layers 3 on the resin film 2 are formed in the shape of stripes arranged at intervals. This helps reduce the loss of heat during heat conduction through the resin layers 3 from the high-temperature end 1H to the low-temperature end 1C. Moreover, the resin layers 3 have a smaller area than when they are formed all over the resin film 2. This helps reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs.
- the portions where the resin layers 3 are not formed have comparatively low thermal conductivity, since the resin layers 3 are formed in the shape of stripes, by determining the widths and intervals of the stripes of the resin layers 3 so that the working gas makes as little contact as possible with those low-thermal-conductivity portions, it is possible to minimize the lowering of heat energy regeneration efficiency.
- Fig. 4 is a perspective view showing the structure of the regenerator of the third embodiment of the invention.
- the resin film 2 has a plurality of fine projections 2a formed regularly all over one surface thereof These projections 2a permit gaps to be left between different turns of the resin film 2 laid on one another.
- the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B).
- the portions of the regenerator 1 around the high-temperature end 1H and the low-temperature end 1C thereof contribute to heat energy regeneration to a particularly high degree.
- resin layers 3 containing an ingredient having higher thermal conductivity than the resin film 2 are formed so as to occupy a predetermined width from each edge of the regenerator 1 by the same process as in the second embodiment.
- the resin layers 3 on the resin film 2 are formed to occupy a predetermined width from each edge of the regenerator 1, and thus have a smaller area than when they are formed all over. This helps accordingly reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs. Moreover, since these portions of the regenerator 1 contribute to heat energy regeneration to a high degree, almost no lowering in the performance of the regenerator 1 results.
- FIG. 5 is a perspective view showing the structure of the regenerator of the fourth embodiment of the invention.
- resin layers 3 containing an ingredient having higher thermal conductivity than the resin film 2 are formed in the shape of stripes arranged at regular intervals along the cylinder axis so as to occupy a predetermined width from each edge of the regenerator 1.
- the resin layers 3 on the resin film 2 are formed at intervals so as to occupy a predetermined width from each edge of the regenerator 1, and thus have a smaller area than when they are formed all over. This helps accordingly reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs. Moreover, since these portions of the regenerator 1 contribute to heat energy regeneration to a high degree, almost no lowering in the performance of the regenerator 1 results.
- the resin film 2 is described as having the resin layers 3 formed on both surfaces thereof
- FIG. 6 is a perspective view showing the structure of the regenerator of the fifth embodiment of the invention.
- resin coatings 4 of polyethylene or the like are formed so as to occupy a predetermined width from each edge of the regenerator 1.
- masks are laid beforehand. Then, a resin material is printed as ink on both surfaces of the resin film 2 to achieve coating. Lastly, the masks are washed off and removed to obtain the resin coatings 4.
- the portions of the resin film 2 occupying a predetermined width from each edge thereof, i.e., the portions that contribute to heat energy regeneration to a high degree, are made thicker. This not only helps increase heat storage capacity and thereby enhance heat energy regeneration efficiency, but also helps make the resin film 2 less prone to develop wrinkles when rolled up.
- the resin film 2 is described as having the resin coatings 4 formed on both surfaces thereof.
- Fig. 7 is an enlarged sectional view showing the regenerator of the sixth embodiment of the invention.
- the regenerator 1 is composed of a composite resin film 20 rolled into a cylindrical shape.
- the composite resin film 20 is composed of two strip-shaped resin films 21 and 22 having a resin layer 3, described later, laminated between them.
- One resin film 21 has a plurality of fine projections 2a formed regularly all over one surface thereof As shown in Fig. 7, these projections 2a permit gaps to be left between different turns of the composite resin film 20 laid on one another.
- the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis.
- a resin layer 3 having higher thermal conductivity than the resin film 22 is formed as a thin film.
- the two resin films 21 and 22 are laid together so that the surface of the resin film 22 on which the resin layer 3 is formed is kept in intimate contact with the surface of the resin film 21 on which the projections 2a are not formed. In this way, the composite resin film 20 having the resin layer 3 laminated inside it is produced.
- the resin layer 3 is not exposed to outside, and therefore it never drops off. This greatly enhances durability.
- the laminated resin layer 3 may be formed in stripes arranged at predetermined intervals along the cylinder axis as shown in Fig. 3, or may be formed so as to occupy a predetermined width from each edge of the regenerator 1 as shown in Fig. 4, or may be formed in stripes arranged at predetermined intervals along the cylinder axis so as to occupy a predetermined width from each edge of the regenerator 1 as shown in Fig. 5.
- the resin layer or layers 3 are described as being printed as ink. However, they may be formed by any other method, such as painting, vapor deposition, plating, or application of a thin film tape.
- regenerator 1 structured as described above in a doughnut-shaped space to constitute a system in which a gas is made to flow through that space in a reciprocating fashion, it is possible to realize a versatile flow gas heat regeneration system as exemplified by a ftee-piston-type Stirling-cycle refrigerator.
- a layer having higher thermal conductivity than the resin film is formed, or altematively a resin coating is formed so as to occupy a predetermined width from an edge of the regenerator.
- This increases heat conduction in the regenerator and stabilizes the performance thereof.
- a flow gas heat regeneration system having this regenerator disposed in a doughnut-shaped space, when a hot working gas flows into the regenerator through one end thereof, the heat of the working gas is stored in the resin film.
- the layer having high thermal conductivity or the resin coating formed on the resin film enhances heat conduction in the regenerator. Thus, more heat is stored in the resin film.
- the layer having high thermal conductivity or the resin coating formed on the resin film enhances heat conduction in the regenerator and increases the heat capacity thereof. Thus, more heat is rejected to the working gas. In this way, it is possible to achieve high heat energy regeneration efficiency.
- regenerator of the present invention when applied to a free-piston-type Stirling-cycle refrigerator, it is possible to achieve excellent refrigerating performance.
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Abstract
Description
- The present invention relates to a regenerator for use in a Stirling-cycle refrigerator or the like, and relates also to a flow gas heat regeneration system employing such a regenerator
- A type of
conventional regenerator 1 for use in a Stirling-cycle refrigerator is, for example as shown in Fig. 8, composed of aresin film 2, havingfine projections 2a formed on the surface thereof, rolled into a cylindrical shape with a hollow space left inside it. - Fig. 9 is a side sectional view of an example of a free-piston-type Stirling-cycle refrigerator incorporating the
regenerator 1. First, the operation of this Stirling-cycle refrigerator will be described. As shown in Fig. 9, the free-piston-type Stirling-cycle refrigerator includes acylinder 8 having a working gas such as helium sealed therein, adisplacer 7 and apiston 5 arranged so as to divide the space inside thecylinder 8 into anexpansion space 10 and acompression space 9, alinear motor 6 for driving thepiston 5 to reciprocate, a heat absorber 14 provided on theexpansion space 10 side for absorbing heat from outside, and aheat rejector 13 disposed on thecompression space 9 side for rejecting heat to outside. - In Fig. 9,
reference numerals displacer 7 and thepiston 5, respectively, and permit them to reciprocate by resilience.Reference numeral 15 represents a heat rejecting heat exchanger, andreference numeral 16 represents a heat absorbing heat exchanger. These heat exchangers prompt exchange of heat between inside and outside the refrigerator. Between the heat rejectingheat exchanger 15 and the heat absorbingheat exchanger 16, aregenerator 1 is disposed. - In this structure, when the
linear motor 6 is driven, thepiston 5 moves up inside thecylinder 8, compressing the working gas in thecompression space 9. As the working gas is compressed, its temperature rises, but simultaneously the working gas is cooled through heat exchange with the outside air by theheat rejector 13 through the heat rejectingheat exchanger 15. Thus, isothermal compression is achieved. The working gas compressed in thecompression space 9 by thepiston 5 flows, under pressure, into theregenerator 1 and then into theexpansion space 10. Meanwhile, the heat of the working gas is stored in theresin film 2 constituting theregenerator 1, and thus the temperature of the working gas falls. - The working gas that has flowed into the
expansion space 10 is under high pressure, and is expanded when thedisplacer 7, which reciprocates with a predetermined phase difference kept relative to thepiston 5, moves down. Meanwhile, the temperature of the working gas falls, but the working gas is heated through absorption of heat from the outside air by the heat absorber 14 through the heat absorbingheat exchanger 16. Thus, isothermal expansion is achieved. Thereafter, thedisplacer 7 starts moving up, and thus the working gas in theexpansion space 10 flows through theregenerator 1 back into thecompression space 9. Meanwhile, the working gas receives the heat stored in theregenerator 1, and thus the temperature of the working gas rises. This sequence of operations, called the Stirling cycle, is repeated by the reciprocating movement of the driven components, with the result that the heat absorber 14 absorbs heat from the outside air and gradually becomes cold. - In this way, the heat energy of the working gas is regenerated by the
regenerator 1 between thecompression space 9 and theexpansion space 10. Here, increasing the amount of heat stored in theregenerator 1 results in higher heat energy regeneration efficiency. This makes it possible to achieve an ideal Stirling cycle and thereby enhance the refrigerating performance of the Stirling-cycle refrigerator. - However, in the structure of the
conventional regenerator 1 described above, theregenerator 1 itself is composed of aresin film 2, which generally has low thermal conductivity. This leads to low heart conduction from the working gas to theresin film 2. Thus, theregenerator 1 cannot store a sufficient amount of heat, resulting in unsatisfactory heat energy regeneration efficiency. This lowers the refrigerating performance of the Stirling-cycle refrigerator. Moreover, the edges of the regenerator are prone to deformation, causing variations in regeneration performance and leading to unstable regeneration performance. Accordingly, an object of the present invention is to provide a regenerator that offers excellent heat energy regeneration efficiency and stable regeneration performance. - DE 3240598 discloses a rotating heat recovery device which has a matrix formed from plastic. Dimensions of the matrix are adapted to specific dimensional parameters, and the matrix strip is equipped with transverse bulges which have a length that is less than the strip width, in order to permit a wind-up tension to act on the strip without influencing the dimensions of the bulges. The dimensional parameters permitted by the use of plastic permit the production of matrix discs having a minimum thickness which reduces the circumferential leakage loss.
- According to one aspect of the present invention, there is provided a regenerator composed of a strip-shaped resin film rolled into a cylindrical shape, the resin film has a multiple layer structure at least in a portion thereof occupying a predetermined width from an edge thereof. This helps increase the strength of the edges of the regenerator so that they are less prone to deformation, and thus helps stabilise the performance of the regenerator.
- When the hot working gas flows into the regenerator through one end thereof, the heat of the working gas is stored in the resin film. Here the layer having high thermal conductivity formed on the resin film enhances heat conduction in the regenerator. Thus, more heat is stored in the resin film. When the cold working gas flows into the regenerator through the other end thereof, the working gas receives the heat stored in the resin film. Here, the layer having high thermal conductivity formed on the resin film enhances heat conduction in the
regenerator 1 and provides higher heat capacity. Thus more heat is rejected to the working gas. In this way, it is possible to achieve high heat energy regeneration efficiency. - The resin film may have a plurality of fine projections formed on the surface thereof. This leaves gaps between different turns of the resin film laid on one another, and thus permits the working gas to flow through those gaps from the high-temperature end to the low-temperature end and vice versa along the cylinder axis.
- Preferably the regenerator composed of a strip-shaped resin film rolled into a cylindrical shape, the resin film is composed of two strip-shaped resin films having a layer with higher thermal conductivity than the two resin films laminated between the two resin films. This helps avoid exposing the layer having high thermal conductivity to outside.
- In particular, forming the layer having high thermal conductivity on the resin film so as to occupy a predetermined width from an edge of the regenerator helps reduce the area, and this the material costs and the like, of the layer having high thermal conductivity compared with a case where the layer having high thermal conductivity is formed all over the resin film. The layer having high thermal conductivity can be formed easily by being printed on the resin film as resin ink containing an ingredient having high thermal conductivity. In that case, suitable as the ingredient having high thermal conductivity is fine particles of at least one of gold, silver, copper, aluminium, and carbon.
- By disposing the regenerator of the present invention in a doughnut-shaped space serving as a flow pass for a reciprocating gas, it is possible to realise a versatile flow gas heat regeneration system that offers high heat energy regeneration efficiency. In particular, by applying the present invention to a free-piston-type Stirling-cycle refrigerator, it is possible to achieve excellent refrigerating performance.
- In order that the present invention be more readily understood specific embodiments thereof will now be described with reference to the accompanying drawings.
-
- Fig. 1 is a perspective view showing the structure of the regenerator of a first embodiment of the invention.
- Fig. 2 is an enlarged sectional view of the regenerator.
- Fig. 3 is a perspective view showing the structure of the regenerator of a second embodiment of the invention.
- Fig. 4 is a perspective view showing the structure of the regenerator of a third embodiment of the invention.
- Fig. 5 is a perspective view showing the structure of the regenerator of a fourth embodiment of the invention.
- Fig. 6 is a perspective view showing the structure of the regenerator of a fifth embodiment of the invention.
- Fig. 7 is an enlarged sectional view showing the regenerator of a sixth embodiment of the invention.
- Fig. 8 is a perspective view showing the structure of an example of a conventional regenerator.
- Fig. 9 is a side sectional view showing an example of a free-piston-type Stirling-cycle.
- A first embodiment of the invention will be described with reference to the drawings. Fig. 1 is a perspective view showing the structure of the regenerator of the first embodiment of the invention, and Fig. 2 is an enlarged sectional view of the regenerator. As shown in Fig. 1, the
regenerator 1 is composed of a strip-shapedresin film 2 rolled into a cylindrical shape. Theresin film 2 is formed out of a material having high specific heat, low thermal conductivity, high heat resistance, low moisture absorption, and other desirable properties, suitable examples including polyethylene terephthalate (PET) and polyimide. - The
resin film 2 has a plurality offine projections 2a formed regularly all over one surface thereof. Theseprojections 2a can be formed, for example, by printing, embossing, or heat forming. As shown in Fig. 2, theprojections 2a permit gaps to be left between different turns of theresin film 2 laid on one another. Thus, through these gaps, as shown in Fig. 1, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B). - On both surfaces of the
resin film 2,resin layers 3 containing an ingredient having higher thermal conductivity than theresin film 2 are formed as thin films. Suitable as the ingredient having high thermal conductivity is fine particles of gold, silver, copper, aluminum, carbon, or the like used singly or as a mixture of two or more of them. The fine particles are mixed with a resin material such as polyethylene, and the mixture is then printed, as ink, on both surfaces of theresin film 2 to coat it with the resin layers 3. - Next, how heat regeneration is achieved in a Stirling-cycle refrigerator employing this
regenerator 1 will be described. When a working gas compressed and thereby heated flows into theregenerator 1 through the high-temperature end 1H thereof, the heat energy of the working gas is stored in theresin film 2. Here, since the resin layers 3 on theresin film 2 have sufficiently high thermal conductivity, the heat energy first conducts along the resin layers 3 and is then stored in theentire resin film 2. Thus, a sufficient amount of heat is stored. On the other hand, when the working gas expanded and thereby cooled flows into theregenerator 1 through the low-temperature end 1C thereof, the stored heat is rejected. Here, the heat energy conducts along the resin layers 3 and is rejected from theentire resin film 2 to the working gas. Thus, a sufficient amount of heat is rejected. In this way, the regenerator I operates with enhanced regeneration energy efficiency. - A second embodiment of the invention will be described with reference to the drawings. Fig. 3 is a perspective view showing the structure of the regenerator of the second embodiment of the invention. As shown in Fig. 3, the
resin film 2 has a plurality offine projections 2a formed regularly all over one surface thereof Theseprojections 2a permit gaps to be left between different turns of theresin film 2 laid on one another. Thus, through these gaps, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B). - As shown in Fig. 3, on both surfaces of the
resin film 2,resin layers 3 containing an ingredient having higher thermal conductivity than theresin film 2 are formed in the shape of stripes arranged at regular intervals along the cylinder axis. In the portions on the surfaces of theresin film 2 where the resin layers 3 are not formed, masks are laid beforehand in the shape of stripes arranged at regular intervals. Then, coating is performed just as in the first embodiment. Lastly, the masks are washed off and removed to obtain the resin layers 3. The stripes of the resin layers 3 may be arranged at irregular intervals. - Next, how heat regeneration is achieved in a Stirling-cycle refrigerator employing this
regenerator 1 will be described. When a working gas compressed and thereby heated flows into theregenerator 1 through the high-temperature end 1H thereof, the heat energy of the working gas is stored in theresin film 2. Here, since the resin layers 3 on theresin film 2 have sufficiently high thermal conductivity, the heat energy first conducts to the individual stripes of the resin layers 3 and is then stored from the individual stripes to theresin film 2. Thus, a sufficient amount of heat is stored. On the other hand, when the working gas expanded and thereby cooled flows into theregenerator 1 through the low-temperature end 1C thereof, the stored heat is rejected. Here, the heat energy conducts from theresin film 2 to the individual stripes of the resin layers 3 and is then rejected to the working gas. Thus, a sufficient amount of heat is rejected. In this way, theregenerator 1 operates with enhanced regeneration energy efficiency. - In this embodiment, the resin layers 3 on the
resin film 2 are formed in the shape of stripes arranged at intervals. This helps reduce the loss of heat during heat conduction through the resin layers 3 from the high-temperature end 1H to the low-temperature end 1C. Moreover, the resin layers 3 have a smaller area than when they are formed all over theresin film 2. This helps reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs. Although the portions where the resin layers 3 are not formed have comparatively low thermal conductivity, since the resin layers 3 are formed in the shape of stripes, by determining the widths and intervals of the stripes of the resin layers 3 so that the working gas makes as little contact as possible with those low-thermal-conductivity portions, it is possible to minimize the lowering of heat energy regeneration efficiency. - A third embodiment of the invention will be described with reference to the drawings. Fig. 4 is a perspective view showing the structure of the regenerator of the third embodiment of the invention. As shown in Fig. 4, the
resin film 2 has a plurality offine projections 2a formed regularly all over one surface thereof Theseprojections 2a permit gaps to be left between different turns of theresin film 2 laid on one another. Thus, through these gaps, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis (the direction indicated by a dash-and-dot line B). Here; the portions of theregenerator 1 around the high-temperature end 1H and the low-temperature end 1C thereof contribute to heat energy regeneration to a particularly high degree. - As shown in Fig. 4, on both surfaces of the
resin film 2,resin layers 3 containing an ingredient having higher thermal conductivity than theresin film 2 are formed so as to occupy a predetermined width from each edge of theregenerator 1 by the same process as in the second embodiment. - In this embodiment, the resin layers 3 on the
resin film 2 are formed to occupy a predetermined width from each edge of theregenerator 1, and thus have a smaller area than when they are formed all over. This helps accordingly reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs. Moreover, since these portions of theregenerator 1 contribute to heat energy regeneration to a high degree, almost no lowering in the performance of theregenerator 1 results. - A fourth embodiment of the invention will be described with reference to the drawings. Fig. 5 is a perspective view showing the structure of the regenerator of the fourth embodiment of the invention.
- As shown in Fig. 5, on both surfaces of the
resin film 2,resin layers 3 containing an ingredient having higher thermal conductivity than theresin film 2 are formed in the shape of stripes arranged at regular intervals along the cylinder axis so as to occupy a predetermined width from each edge of theregenerator 1. - In this embodiment, the resin layers 3 on the
resin film 2 are formed at intervals so as to occupy a predetermined width from each edge of theregenerator 1, and thus have a smaller area than when they are formed all over. This helps accordingly reduce the amount of the high-thermal-conductivity ingredient used, and thus helps reduce costs. Moreover, since these portions of theregenerator 1 contribute to heat energy regeneration to a high degree, almost no lowering in the performance of theregenerator 1 results. - In the embodiments described thus far, the
resin film 2 is described as having the resin layers 3 formed on both surfaces thereof However, it is also possible to form a resin layer only on one surface of the resin film. In that case, less ink is required, and coating needs to be performed only once. This greatly reduces costs. - A fifth embodiment of the invention will be described with reference to the drawings. Fig. 6 is a perspective view showing the structure of the regenerator of the fifth embodiment of the invention.
- As shown in Fig. 6, on both surfaces of the
resin film 2,resin coatings 4 of polyethylene or the like are formed so as to occupy a predetermined width from each edge of theregenerator 1. In the central portions on the surfaces of theresin film 2 where theresin coatings 4 need not be formed, masks are laid beforehand. Then, a resin material is printed as ink on both surfaces of theresin film 2 to achieve coating. Lastly, the masks are washed off and removed to obtain theresin coatings 4. - In this embodiment, by forming the
resin coatings 4, the portions of theresin film 2 occupying a predetermined width from each edge thereof, i.e., the portions that contribute to heat energy regeneration to a high degree, are made thicker. This not only helps increase heat storage capacity and thereby enhance heat energy regeneration efficiency, but also helps make theresin film 2 less prone to develop wrinkles when rolled up. - In this embodiment, the
resin film 2 is described as having theresin coatings 4 formed on both surfaces thereof. However, it is also possible to form a resin coating only on one surface of the resin film. In that case, less ink is required, and coating needs to be performed only once. This greatly reduces costs. - A sixth embodiment of the invention will be described with reference to the drawings. Fig. 7 is an enlarged sectional view showing the regenerator of the sixth embodiment of the invention. As shown in Fig. 7, the
regenerator 1 is composed of acomposite resin film 20 rolled into a cylindrical shape. Thecomposite resin film 20 is composed of two strip-shapedresin films resin layer 3, described later, laminated between them. Oneresin film 21 has a plurality offine projections 2a formed regularly all over one surface thereof As shown in Fig. 7, theseprojections 2a permit gaps to be left between different turns of thecomposite resin film 20 laid on one another. Thus, through these gaps, as shown in Fig. 1, the working gas flows from the high-temperature end 1H to the low-temperature end 1C as indicated by an arrow A and vice versa along the cylinder axis. - On one surface of the
resin film 22, aresin layer 3 having higher thermal conductivity than theresin film 22 is formed as a thin film. The tworesin films resin film 22 on which theresin layer 3 is formed is kept in intimate contact with the surface of theresin film 21 on which theprojections 2a are not formed. In this way, thecomposite resin film 20 having theresin layer 3 laminated inside it is produced. - In this embodiment, the
resin layer 3 is not exposed to outside, and therefore it never drops off. This greatly enhances durability. In this case, thelaminated resin layer 3 may be formed in stripes arranged at predetermined intervals along the cylinder axis as shown in Fig. 3, or may be formed so as to occupy a predetermined width from each edge of theregenerator 1 as shown in Fig. 4, or may be formed in stripes arranged at predetermined intervals along the cylinder axis so as to occupy a predetermined width from each edge of theregenerator 1 as shown in Fig. 5. - In all the embodiments described above, the resin layer or
layers 3 are described as being printed as ink. However, they may be formed by any other method, such as painting, vapor deposition, plating, or application of a thin film tape. - By disposing a
regenerator 1 structured as described above in a doughnut-shaped space to constitute a system in which a gas is made to flow through that space in a reciprocating fashion, it is possible to realize a versatile flow gas heat regeneration system as exemplified by a ftee-piston-type Stirling-cycle refrigerator. - As described above, according to the present invention, in a regenerator composed of a strip-shaped resin film rolled into a cylindrical shape, on the surface of the resin film, a layer having higher thermal conductivity than the resin film is formed, or altematively a resin coating is formed so as to occupy a predetermined width from an edge of the regenerator. This increases heat conduction in the regenerator and stabilizes the performance thereof. In a flow gas heat regeneration system having this regenerator disposed in a doughnut-shaped space, when a hot working gas flows into the regenerator through one end thereof, the heat of the working gas is stored in the resin film. Here, the layer having high thermal conductivity or the resin coating formed on the resin film enhances heat conduction in the regenerator. Thus, more heat is stored in the resin film. When the cold working gas flows into the regenerator through the other end thereof, the heat stored in the resin film is rejected to the working gas. Here, the layer having high thermal conductivity or the resin coating formed on the resin film enhances heat conduction in the regenerator and increases the heat capacity thereof. Thus, more heat is rejected to the working gas. In this way, it is possible to achieve high heat energy regeneration efficiency.
- In particular, when the regenerator of the present invention is applied to a free-piston-type Stirling-cycle refrigerator, it is possible to achieve excellent refrigerating performance.
Claims (6)
- A regenerator (1) composed of a strip-shaped resin film (2) rolled into a cylindrical shape, wherein the resin film (2) has a multiple layer structure (2, 3, 4) at least in a portion thereof occupying predetermined width from an edge thereof.
- A regenerator (1) as claimed in claim 1, wherein the resin film has a plurality of fine projections (2a) formed on a surface thereof.
- A regenerator (1) as claimed in claim 1, wherein a layer (3, 4) used to form the multiple layer structure has higher thermal conductivity than the resin film (2).
- A regenerator (1) as claimed in claim 3, wherein the layer (3, 4) having higher thermal conductivity is a resin layer (2) containing an ingredient having high thermal conductivity, and the ingredient having high thermal conductivity is fine particles of at least one of gold, silver, copper, aluminium, and carbon.
- A regenerator according to claim 1 and composed of a strip-shaped resin film (20) rolled into a cylindrical shape, the resin film (20) being composed of two strip-shaped resin films (21, 22) having a layer (3) with higher thermal conductivity than the two resin films (21, 22) laminated between the two resin films.
- A flow gas heat regeneration system comprising a regenerator (1) as claimed in one of claims 1 to 5 disposed in a flow path of reciprocating gas.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001250937A JP2003065620A (en) | 2001-08-22 | 2001-08-22 | Regenerator for stirling machine, and stirling refrigerator and flow gas heat regenerating system using the regenerator |
JP2001250937 | 2001-08-22 | ||
PCT/JP2002/008442 WO2003019086A1 (en) | 2001-08-22 | 2002-08-21 | Regenerator, and heat regenerative system for fluidized gas using the regenerator |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1422484A1 EP1422484A1 (en) | 2004-05-26 |
EP1422484A4 EP1422484A4 (en) | 2004-10-20 |
EP1422484B1 true EP1422484B1 (en) | 2006-01-11 |
Family
ID=19079664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02796355A Expired - Lifetime EP1422484B1 (en) | 2001-08-22 | 2002-08-21 | Regenerator, and heat regenerative system for fluidized gas using the regenerator |
Country Status (11)
Country | Link |
---|---|
US (1) | US20050011632A1 (en) |
EP (1) | EP1422484B1 (en) |
JP (1) | JP2003065620A (en) |
KR (1) | KR100535278B1 (en) |
CN (1) | CN1289881C (en) |
AT (1) | ATE315722T1 (en) |
BR (1) | BR0211908A (en) |
DE (1) | DE60208714T2 (en) |
ES (1) | ES2256581T3 (en) |
TW (1) | TWI227315B (en) |
WO (1) | WO2003019086A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010139316A2 (en) | 2009-06-05 | 2010-12-09 | Danfoss Compressors Gmbh | Regenerator, in particular for a stirling cooling arrangement |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60320681T2 (en) * | 2002-10-31 | 2009-06-10 | Sharp K.K. | REGENERATOR, METHOD FOR THE PRODUCTION OF THE REGENERATOR, SYSTEM FOR THE PRODUCTION OF THE REGENERATOR AND STIRLING-COOLING MACHINE |
CN100561602C (en) * | 2004-07-16 | 2009-11-18 | 鸿富锦精密工业(深圳)有限公司 | Heat aggregation element |
JP2009047327A (en) * | 2007-08-16 | 2009-03-05 | Chubu Electric Power Co Inc | Corrosion preventing method of magnetic working substance, and magnetic working substance |
SE535337C2 (en) * | 2010-09-28 | 2012-07-03 | Torgny Lagerstedt Ab | Ways to increase the efficiency of a regenerative heat exchanger |
JP6165618B2 (en) * | 2013-06-20 | 2017-07-19 | 住友重機械工業株式会社 | Cold storage material and cold storage type refrigerator |
JP6386230B2 (en) * | 2014-02-03 | 2018-09-05 | 東邦瓦斯株式会社 | Thermal accumulator for thermoacoustic devices |
EP3117090A1 (en) * | 2014-03-12 | 2017-01-18 | NV Bekaert SA | Regenerator for a thermal cycle engine |
US10421127B2 (en) * | 2014-09-03 | 2019-09-24 | Raytheon Company | Method for forming lanthanide nanoparticles |
CN106640411B (en) * | 2015-10-30 | 2018-12-21 | 浙江大学 | Regenerator, Stirling engine |
CN108240270A (en) * | 2017-12-26 | 2018-07-03 | 宁波华斯特林电机制造有限公司 | A kind of backheat structure and its arrangement |
CN112050491B (en) * | 2020-09-08 | 2021-05-18 | 中国矿业大学 | Heat regenerator coupled with micro heat pipe and working method |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3240598A1 (en) * | 1981-11-03 | 1983-06-09 | Northern Solar Systems, Inc., Hingham, Mass. | Rotating heat recovery device |
US4432409A (en) * | 1981-11-03 | 1984-02-21 | Northern Solar Systems, Inc. | Rotary heat regenerator wheel and method of manufacture thereof |
DE3812427A1 (en) * | 1988-04-14 | 1989-10-26 | Leybold Ag | METHOD FOR PRODUCING A REGENERATOR FOR A DEEP-TEMPERATURE REFRIGERATOR AND REGENERATOR PRODUCED BY THIS METHOD |
US4866943A (en) * | 1988-10-17 | 1989-09-19 | Cdc Partners | Cyrogenic regenerator |
US5047192A (en) * | 1988-10-17 | 1991-09-10 | Cdc Partners | Process of manufacturing a cryogenic regenerator |
US5429177A (en) * | 1993-07-09 | 1995-07-04 | Sierra Regenators, Inc. | Foil regenerator |
WO1998018880A1 (en) * | 1996-10-30 | 1998-05-07 | Kabushiki Kaisha Toshiba | Cold accumulation material for ultra-low temperature, refrigerating machine using the material, and heat shield material |
US6745822B1 (en) * | 1998-05-22 | 2004-06-08 | Matthew P. Mitchell | Concentric foil structure for regenerators |
JP3583637B2 (en) * | 1999-01-29 | 2004-11-04 | シャープ株式会社 | Regenerator for Stirling engine |
-
2001
- 2001-08-22 JP JP2001250937A patent/JP2003065620A/en active Pending
-
2002
- 2002-08-21 US US10/487,210 patent/US20050011632A1/en not_active Abandoned
- 2002-08-21 KR KR10-2004-7002475A patent/KR100535278B1/en not_active IP Right Cessation
- 2002-08-21 EP EP02796355A patent/EP1422484B1/en not_active Expired - Lifetime
- 2002-08-21 ES ES02796355T patent/ES2256581T3/en not_active Expired - Lifetime
- 2002-08-21 BR BR0211908-0A patent/BR0211908A/en not_active Application Discontinuation
- 2002-08-21 AT AT02796355T patent/ATE315722T1/en not_active IP Right Cessation
- 2002-08-21 WO PCT/JP2002/008442 patent/WO2003019086A1/en active IP Right Grant
- 2002-08-21 CN CNB02816511XA patent/CN1289881C/en not_active Expired - Fee Related
- 2002-08-21 DE DE60208714T patent/DE60208714T2/en not_active Expired - Fee Related
- 2002-08-22 TW TW091119005A patent/TWI227315B/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010139316A2 (en) | 2009-06-05 | 2010-12-09 | Danfoss Compressors Gmbh | Regenerator, in particular for a stirling cooling arrangement |
DE102009023975A1 (en) | 2009-06-05 | 2010-12-16 | Danfoss Compressors Gmbh | Regenerator, in particular for a Stirling cooling device |
Also Published As
Publication number | Publication date |
---|---|
JP2003065620A (en) | 2003-03-05 |
DE60208714T2 (en) | 2006-11-02 |
CN1289881C (en) | 2006-12-13 |
TWI227315B (en) | 2005-02-01 |
BR0211908A (en) | 2004-08-17 |
EP1422484A1 (en) | 2004-05-26 |
WO2003019086A1 (en) | 2003-03-06 |
DE60208714D1 (en) | 2006-04-06 |
ATE315722T1 (en) | 2006-02-15 |
US20050011632A1 (en) | 2005-01-20 |
CN1547655A (en) | 2004-11-17 |
EP1422484A4 (en) | 2004-10-20 |
KR100535278B1 (en) | 2005-12-09 |
KR20040037064A (en) | 2004-05-04 |
ES2256581T3 (en) | 2006-07-16 |
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