EP1328763B1 - Evacuated sorbent assembly and cooling device - Google Patents
Evacuated sorbent assembly and cooling device Download PDFInfo
- Publication number
- EP1328763B1 EP1328763B1 EP01987582A EP01987582A EP1328763B1 EP 1328763 B1 EP1328763 B1 EP 1328763B1 EP 01987582 A EP01987582 A EP 01987582A EP 01987582 A EP01987582 A EP 01987582A EP 1328763 B1 EP1328763 B1 EP 1328763B1
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- EP
- European Patent Office
- Prior art keywords
- sorbent
- cooling device
- liquid
- liquid refrigerant
- beverage
- 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.)
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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
- F25B17/00—Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type
- F25B17/08—Sorption machines, plants or systems, operating intermittently, e.g. absorption or adsorption type the absorbent or adsorbent being a solid, e.g. salt
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/006—Other cooling or freezing apparatus specially adapted for cooling receptacles, e.g. tanks
- F25D31/007—Bottles or cans
Definitions
- the present invention relates to the mechanical arts.
- the present invention relates to a sorbent assembly for use with sorbent-driven cooling devices.
- WO 99/37958 discloses a heat transfer device for cooling or heating a beverage contains a refrigerant and a refrigerant take up agent.
- the device further includes operative means for allowing evaporation of the refrigerant.
- the take up agent takes up the evaporated refrigerant such that heat absorbed on evaporation of the refrigerant is evolved at the take up agent to enable heat to be transferred to or from a material to be heated or cooled.
- the take up agent may be an absorbent or adsorbent.
- an evacuated sorbent assembly as set out in claim 1.
- An embodiment of the present invention provides an evacuated sorbent assembly for coupling to a liquid refrigerant reservoir and another embodiment provides a cooling device comprises of at least one sorbent section, at least one liquid passageway section, and an actuator.
- the sorbent section contains a sorbent for a liquid refrigerant.
- the liquid passageway section is adjacent the sorbent section and defines a liquid passageway through a portion of the evacuated sorbent assembly or cooling device to the sorbent section.
- the liquid passageway contains wicking material of an amount sufficient to prevent the liquid refrigerant from contacting the sorbent.
- the actuator controls liquid communication between the liquid passageway section and the liquid refrigerant reservoir.
- the evacuated sorbent assembly includes a vapour-permeable membrane that separates adjacent sorbent and liquid passageway sections whether or not the liquid passageway section contains wicking material.
- Embodiments of the cooling device additionally include a liquid refrigerant reservoir, adjacent the liquid passageway section, and a casing that surrounds the sorbent section, the liquid passageway section, the vapor permeable membrane the liquid refrigerant reservoir, and the actuator.
- a heat-removing material which may be a phase-changing material, in thermal contact with the sorbent; at least one liquid barrier between the heat-removing material and the sorbent; and at least one thermal spacer positioned between the sorbent section and the liquid passageway section.
- the thermal spacer is interposed between the sorbent section and the vapor-permeable membrane. In other embodiments, the thermal spacer is interposed between the vapor-permeable membrane and the liquid passageway section.
- some embodiments include casings made from a flexible material such as a metallicized plastic.
- a feature of the present invention is that it is compact and lightweight.
- the invention is designed to fit within a host container, i.e., a beverage container.
- An additional feature of the invention, related to its compact size, is the short vapor path between the liquid refrigerant reservoir and the sorbent. The vapor path is at most several millimeters.
- FIGS. 2B and 10-13 do not show embodiments falling within the scope of the claims.
- the word “absorption” refers to the occurrence of a substance (e.g., water vapor) penetrating the inner structure of another (the absorbent).
- the word “adsorption” refers to the occurrence of a substance (e.g., water vapor) being attracted and held onto the surface of another (the adsorbent).
- the words “absorption” and “adsorption” include derivatives thereof.
- the word “sorbent” refers to a material that is either an absorbent and/or an adsorbent.
- the evacuated sorbent assembly and cooling device is shown in the exemplary drawings. With particular reference to FIGS. 1, 2A and B, there is shown a cooling device 10 housing an evacuated sorbent assembly 12 adjacent a liquid refrigerant reservoir 14, which contains a liquid refrigerant 16.
- the cooling device includes an evacuable casing 18, with opposing ends 20 and 22, and opposing sides 24 and 26.
- the casing is substantially impervious to air and moisture so as to provide the cooling device with a suitable shelf-life (to allow for several years of storage/inactivation prior to use).
- Useful casing materials have an oxygen transmission rate (OTR) preferably less than about 1 cm 3 /m 2 /day, more preferably less than 0.1 cm 3 /m 2 /day, and most preferably less than 0.01 cm 3 /m 2 /day.
- OTR oxygen transmission rate
- the vapor transmission rate of useful casing materials is preferably less than about 2 g/m 2 /day, more preferably less than 1 g/m 2 /day, and the most preferably less than about 0.1 g/m 2 /day.
- the casing 18 is made from a flexible material such as a metallicized plastic laminate or a metal foil plastic laminate. Suitable casing materials include flexible films.
- the flexibility of the cooling device allows it to be deformed without losing its performance characteristics.
- the cooling device may be curled and then placed within a beverage container without any degradation in its cooling abilities.
- FIGS. 2A and B A sectional view of the cooling device 10 is shown in FIGS. 2A and B. Included in the evacuated sorbent assembly 12 are a pair of sorbent sections 28 and 30 in which a sorbent 32 is disposed.
- the sorbent preferably includes an absorbent material dispersed on, impregnated in, affixed to, or otherwise combined with the porous support material.
- the porous support material preferably has a high pore volume, and therefore a high surface area, to accommodate the absorption of large amounts of liquid refrigerant 16, in vapor form, by the sorbent.
- the pore volume is expressed in units of volume per unit mass.
- the porous support material has a pore volume of at least about 0.8 cc/g, more preferably at least about 1 cc/g, and even more preferably at least about 1.5 cc/g.
- the average pore diameter is preferably at least about 1 nanometer, and typically in the range from about 1 to about 20 nanometers.
- the average pore diameter distribution is such that there are very few pores having a diameter of less than about 0.5 nanometers.
- the porous support material can be selected from virtually any material having the above-identified properties. Preferred materials for the porous support material include activated carbon and silica.
- the porous support material can come in a variety of shapes and sizes selected for a particular application.
- the porous support material is comprised of small activated carbon pellets having a size in the range of from about 0.5 to 2 millimeters.
- the porous support material is silica pellets having a size from about 0.25 to 0.5 millimeters. The size of the pellets can be selected to influence the rate at which the vapor from the liquid refrigerant 16 is absorbed. Larger pellets absorb liquid refrigerant vapor at a slower rate due to increased path length.
- the absorbent material have a pore volume that is at least about 50 percent of the pore volume of the porous support material, and even more preferably at least about 66 percent of the pore volume of the porous support material. That is, it is preferred that if the pore volume of the porous support material is about 1.5 cc/g, then the pore volume of the absorbent material is preferably no less than about 0.75 cc/g, more preferably no less than about 1.0 cc/g.
- the absorbent material is preferably capable of absorbing at least about 100 percent of its weight in water, more preferably at least about 150 percent of its weight in water, and even more preferably at least about 200 percent of its weight in water.
- the amount of water that can be absorbed will also be influenced by the relative humidity and temperature.
- absorbent material any suitable absorbent material can be used.
- Representative absorbent materials include salts such as calcium chloride, lithium chloride, lithium bromide, magnesium chloride, calcium nitrate, and potassium fluoride.
- Other suitable absorbent materials include phosphorous pentoxide, magnesium perchlorate, barium oxide, calcium oxide, calcium sulfate, aluminum oxide, calcium bromide, barium perchlorate, and copper sulfate, zeolite 13x, zeolite 5a, silicalite, silica gel, alumina, carbon, modified carbons and the like.
- the absorbent material may also contain combinations of two or more of these materials.
- each sorbent section 28 and 30 Adjacent to each sorbent section 28 and 30 are liquid passageway sections 34 and 36, respectively, defining liquid passageways, through at least a portion of the evacuated adsorbent assembly 12.
- a pair of actuators 42 and 44 control the flow of liquid refrigerant 16 from the liquid refrigerant reservoir 14 into the liquid passageway sections.
- the actuators are mechanically activated.
- the actuators are pressure activated such that a change in pressure causes the actuators to open and permit communication between the liquid refrigerant reservoir and the liquid passageway sections.
- a wicking material 46 is placed within the liquid passageway sections 34 and 36.
- the wicking material draws liquid refrigerant 16 from the liquid refrigerant reservoir 14 and retains the liquid refrigerant for subsequent vaporization and adsorption by the sorbent 32.
- the wicking material absorbs any vaporized liquid refrigerant in the liquid passageway sections that re-condenses before reaching the sorbent.
- suitable wicking materials include hydrophilic materials such as microporous metals, porous plastics (polyethylene, polypropylene), cellulose products, sintered heat pipe material, or glass paper, and the like.
- wicking material 46 is required than is necessary to draw all of the liquid refrigerant 16 to be adsorbed in the evacuated sorbent assembly 12.
- the wicking material has a pore size sufficient to permit capillary action (the drawing of all the liquid refrigerant from the liquid refrigerant reservoir 14) to occur within 60 seconds, and most preferably, within 10 seconds after actuation.
- the wicking material 46 provides a direct interface between the liquid refrigerant 16 and the sorbent 32.
- the wicking material maintains and holds the liquid refrigerant until it is vaporized and later adsorbed by the sorbent.
- Sufficient wicking material is used so that non-vaporized liquid refrigerant does not directly contact the sorbent.
- a vapor-permeable membrane 48 separating sorbent sections 28 and 30 and adjacent liquid passageway sections 34 and 36.
- the vapor-permeable membrane is semi-permeable such that only vaporized liquid refrigerant 16 may pass through it to be adsorbed by the sorbent 32.
- the vapor-permeable membrane is a substantially flat film that is heat-sealed or sealed by an adhesive so as to encase the sorbent and to prevent liquid from contacting the sorbent within the vapor-permeable membrane.
- Useful vapor-permeable membranes include semi-permeable films such as films available under the trademark TYVEK®.
- the vapor-permeable membrane is not substantially flat, but is corrugated or otherwise shaped so as to increase surface area and thereby the rate at which vaporized liquid refrigerant passes through the membrane.
- the vapour-permeable membrane 48 may be a hydrophobic coating applied to one or both of the surfaces of the sorbent sections 28 and 30 and the liquid passageway sections 34 and 36 which are facing one another. Suitable hydrophobic coatings include those available under the trademark SCOTCHGARD®.
- thermal spacers 56 and 58 are interposed between the sorbent sections and the vapor-permeable membranes 48 or between the sorbent sections and the wicking material.
- the thermal spacers are utilized to insulate heat generated by the sorbent 32. Since the temperature between the wicking material and sorbent sections can vary from 5°C to 150°C, the thermal spacers have a thermal resistance (thermal conductivity at package conditions divided by thickness) preferably less than 100 W/m 2 K, more preferably less than 50 W/m 2 K, and most preferably less than 20 W/m 2 K.
- the materials utilized for the thermal spacers can be selected from a range of materials known to the art that provide sufficient vapor permeability such as fiberglass, plastic fibers, and plastic foams.
- an insulating material 71 is placed between the sorbent sections 28 and 30 and adjacent liquid passageway sections 34 and 36 replacing the wicking material 46, thermal spacers 56 and 58, and the vapor-permeable membrane 48 shown in the embodiment illustrated in FIG. 2A.
- the insulating material 71 is chosen to inhibit thermal leakback from the sorbent sections 28 and 30 to the exterior of the device.
- the insulating material has thermal conductivity limits less than 0.05 W/mK, preferably less than about 0.035 W/mK, and most preferably, less than about 0.025 W/mK.
- the insulating material 71 has a collapse strength sufficient to resist about one bar uniaxial load, and limit the shrinkage, due to evacuation, to less than about 20%, more preferably less than about 5%, and most preferably less than about 2%.
- an anisotropic insulating material containing both a hydrophilic region 72 and a hydrophobic region 73 is preferred. Such an insulating material inhibits the passage of liquid refrigerant 16 into the sorbent sections 28 and 30, yet allows the vapor of the liquid refrigerant to pass into the sorbent sections 28 and 30.
- the hydrophilic region 72 of the insulating material has pores with a relatively large diameter, not less than 10 mm in diameter, on average.
- the large pores of the hydrophilic region 72 encourage the rapid flow of liquid refrigerant 16 into the material.
- the hydrophobic region 73 has pores of a relatively small diameter, typically less than about 2 mm in diameter, so that the un-vaporized liquid refrigerant 16 is inhibited from passing into the sorbent section 28 and 30, but rather only the vapor from the liquid refrigerant 16 is directed into the sorbent section 28 and 30.
- the ratio of the thickness of the hydrophobic region 73 to hydrophilic region 72 is a function of the choice of materials used to form those regions, the quantity of liquid refrigerant 16 in the device, and the desired performance criteria of the device.
- the insulating material 73 can be formed by laminating a hydrophilic material such as cellulose, paper, non-woven or woven cloth formed from fibers of glass, plastic, ceramic or cellulose, to a hydrophobic material.
- the hydrophobic material can be made by modifying a hydrophilic material with a hydrophobic agent, such as by impregnating a hydrophilic material with wax or adding a hexamethyldisiliazane or a flourinated reactive group to the hydrophilic material.
- the insulating material can be formed by surface modification, whereby a sheet of material (either hydrophilic or hydrophobic) is modified to change the surface on one side.
- a sheet of material either hydrophilic or hydrophobic
- the surface of one side of a hydrophobic material can be made hydrophilic by exposure to thermal or plasma treatments or by impregnation with surfactants.
- the surface of a hydrophilic material can be made hydrophobic by treatment with hydrophobing agents or impregnation of wax-like material.
- the evacuated sorbent assembly 12 can also contain a heat-removing material 50 in thermal contact with the sorbent sections 28 and 30.
- the heat-removing material is placed adjacent to the surface of the sorbent section(s) opposite the vapor-permeable membrane 48.
- the heat-removing material is one of three types: (1) a material that undergoes a change of phase when heat is applied (phase-change material); (2) a material that has a heat capacity greater than the sorbent 32; or (3) a material that undergoes an endothermic reaction when brought in contact with a vaporized liquid refrigerant 16.
- phase-change material a material that undergoes a change of phase when heat is applied
- a material that has a heat capacity greater than the sorbent 32 or (3) a material that undergoes an endothermic reaction when brought in contact with a vaporized liquid refrigerant 16.
- the heat-removing material for use in a particular application may vary depending on the sorbent utilized, the thermal insulation, if any, between the phase-
- Suitable heat-removing materials 50 include paraffin, naphthalene sulphur, hydrated calcium chloride, bromocamphor, cetyl alcohol, cyanamide, eleudic acid, lauric acid, hydrated calcium silicate, sodium thiosulfate pentahydrate, disodium phosphate, hydrated sodium carbonate, hydrated calcium nitrate, neopentyl glycol, hydrated inorganic salts including Glauber's salt, inorganic salts encapsulated in paraffin, hydrated potassium and sodium sulfate, and hydrated sodium and magnesium acetate.
- the preferred heat-removing material is an inorganic salt that has been melted and re-solidified to form a monolith (thereby reducing the volume of the heat-removing material by approximately 30%).
- the heat-removing material 50 removes some of the heat from the sorbent sections 28 and 30 simply through the storage of sensible heat, because the heat-removing material heats up as the sorbent sections heat up, thereby removing heat from the sorbent sections.
- the most effective heat-removing material typically undergoes a change of phase.
- a large quantity of heat is absorbed in connection with a phase change (i.e., change from a solid phase to a liquid phase, change from a solid phase to part solid phase and part liquid phase, or change from a liquid phase to a vapor phase).
- phase change there is typically little change in the temperature of the heat-removing material, despite the relatively substantial amount of heat absorbed to effect the change.
- phase-change heat-removing material 50 change phase at a temperature greater than the expected ambient temperature of the material to be cooled, but less than the temperature achieved by the sorbent sections 28 and 30 upon absorption of a substantial fraction (i.e., one-third or one-quarter) of the liquid refrigerant 16.
- the phase change should take place at a temperature above about 30 °C, preferably above about 35 °C but preferably below about 70 °C, and most preferably below about 60 °C.
- a phase-change heat-removing material 50 When absorbing heat, a phase-change heat-removing material 50 may generate by-products such as water, aqueous salt solutions, and organics. Therefore, depending on the particular heat-removing material utilized, in some embodiments it is desirable to include liquid barriers 52 and 54, such as polyethlene or polypropylene film, interposed between the sorbent sections 28 and 30, respectively, and the heat-removing material to prevent any by-products from contacting the sorbent 32 (and thereby decreasing its effectiveness).
- the liquid barriers are heat sealed or adhesively sealed to the heat-removing material.
- the liquid refrigerant reservoir 14 is positioned immediately adjacent one end 22 of the casing 18. This arrangement provides an advantage over prior art sorbent chambers that typically employ devices with long vapor paths which decrease the effectiveness of the vaporization of the liquid refrigerant 16. In addition, the short vapor paths allow the evacuated sorbent assembly 12 to operate at a much higher pressure level than previous sorbent assemblies.
- the liquid refrigerant reservoir 14 is a plastic 60, typically made of polyethylene, that is filled and heat sealed along its edges 62 enclosing the liquid refrigerant 16. Weakened portions 64 and 66 of the plastic bag serve as pressure sensitive actuators 42 and 44.
- the liquid refrigerant 16 stored in the liquid refrigerant reservoir 14 has a high vapor pressure at ambient temperature so that a reduction of pressure will produce a high vapor production rate.
- the liquid refrigerant has a high heat of vaporization.
- the vapor pressure of the liquid refrigerant at 20°C is typically at least about 9 mm Hg, preferably at least about 15 or 20 mm Hg.
- Suitable liquid refrigerants include various alcohols, such as methyl alcohol or ethyl alcohol; ketones or aldehydes such as acetone and acetaldehyde; and hydrofluorocarbons such as C318, 114, 21, 11, 114B2, 113, 112, 134A, 141B, and 245FA.
- the preferred liquid refrigerant is water because it is plentiful and does not pose any environmental problems while providing the desired cooling characteristics.
- the liquid refrigerant 16 is mixed with an effective quantity of a miscible nucleating agent (or a partial miscible nucleating agent) having a greater vapor pressure than the liquid refrigerant to promote ebullition so that the liquid refrigerant evaporates even more quickly and smoothly, while preventing the liquid refrigerant from super-cooling and thereby decreasing the adsorption rate in the sorbent 32.
- a miscible nucleating agent or a partial miscible nucleating agent having a greater vapor pressure than the liquid refrigerant to promote ebullition so that the liquid refrigerant evaporates even more quickly and smoothly, while preventing the liquid refrigerant from super-cooling and thereby decreasing the adsorption rate in the sorbent 32.
- Suitable nucleating agents include ethyl alcohol, acetone, methyl alcohol, isopropyl alcohol and isobutyl alcohol, all of which are miscible with water.
- a combination of a nucleating agent with a compatible liquid might be a combination of 5% ethyl alcohol in water or 5% acetone in methyl alcohol.
- the nucleating agent preferably has a vapor pressure at 25°C of at least about 25 mm Hg, and, more preferably, at least about 35 mm Hg.
- a solid nucleating agent may be used, such as a conventional boiling stone used in chemical laboratory applications.
- the sorbent sections 28 and 30 are inserted into the casing 18 along with the liquid refrigerant reservoir 14 prior to heat sealing the casing.
- wicking material 46 is placed adjacent the sorbent sections and encased with a vapor-permeable membrane 48.
- the vapor-permeable membrane also encases a layer of heat-removing material 50 in thermal contact with the sorbent 32, liquid barriers 52 and 54 interposed between the heat-removing material and the sorbent sections, respectively, and thermal spacers 56 and 58 interposed between the sorbent sections and the liquid passageway sections 34 and 36, respectively.
- the thermal spacers may be interposed between the sorbent sections and the vapor-permeable membrane or between the vapor-permeable membrane and the liquid passageway sections.
- insulating material 71 is placed between the sorbent sections and liquid passageway sections 34 and 36.
- the opposing ends 20 and 22 and at least one of the opposing sides 24 and 26 are heat sealed after evacuation to greater than 1 mm Hg.
- the casing is sealed with an adhesive.
- the liquid refrigerant reservoir 14 is a plastic bag 60 with weakened portions 64 and 66
- external pressure is applied to the casing 18 and liquid refrigerant reservoir. The external pressure ruptures the weakened portions 64 and 66 and releases the liquid refrigerant into the liquid passageways.
- Liquid refrigerant 16 is introduced into the evacuated adsorbent assembly 12 from the liquid refrigerant reservoir 14 via the liquid passageways 34 and 36.
- the liquid refrigerant collects in very thin layers among the interstices of the wicking material 46.
- the vaporized liquid refrigerant then passes through the vapor-permeable membrane 48, and enters the sorbent sections 28 and 30 where the vaporized liquid refrigerant is adsorbed by the sorbent 32.
- the liquid refrigerant collects in the hydrophilic region of the insulation material.
- the vaporized refrigerant then passes through the hydrophilic region 73 and absorbent sections 28 and 30. As the sorbent adsorbs vaporized liquid refrigerant, the liquid refrigerant collected within the wicking material begins to vaporize and pass through the vapour-permeable membrane into the sorbent.
- Vaporization of the liquid refrigerant 16 causes a cooling effect on the outside of the cooling device 10 which, as shown in FIG. 3 can be used to cool a beverage 80 in a beverage container 82.
- Less than 1.5 grams of liquid refrigerant water per 30 millilitres (fluid ounce) of beverage, less than 3 grams of sorbent 32 per 30ml (fluid ounce) of beverage, and less than 5 cubic centimetres of sorbent 32 per 30ml (fluid ounce) of beverage is required to cool the beverage by 22°C in preferably less than 10 minutes, more preferably less than 5 minutes, and most preferably less than 3 minutes after actuation.
- the cooling device occupies less than 15ml (0.5 fluid ounces) per 30m) (fluid ounce) of beverage.
- the evacuated sorbent assembly 12 and cooling device 10 of the invention may be used as part of a cooling device which may be wrapped around the outer circumference of a beverage container rather than being placed therein.
- the sorbent assembly need not be symmetrical, but rather, it can be asymmetrical and arranged, for example, such that the layer adjacent the casing 18 is the sorbent section 28, with the next layer being the vapor-permeable membrane 48, and with the final layer being the wicking material 46.
- the sorbent assembly and cooling device can be arranged in a spherical configuration as shown in FIGS. 4, 5, and 6.
- the liquid refrigerant reservoir 16 is adjacent the length of the evacuated sorbent assembly 12.
- FIG. 7 shows another embodiment of the present invention where the evacuated sorbent assembly has a polygonal cross-section.
- two or more evacuated sorbent assemblies are adjacent to a single liquid refrigerant reservoir.
- FIG. 10 shows a conventional beverage container pouch 80 constructed of a plastic-lined, metallicized material, which is heat-sealable.
- the pouch has a top end 82, a bottom end 83 formed by panel 84, to create a base for the beverage container pouch, opposing side panels (one shown) 85, and opposing front and back panels, 90 and 92, respectively.
- a single coolant device 94 is formed as part of, or affixed to the exterior surface of the front panel. In other examples, the coolant device may be formed as part of, or affixed to the interior surface of the panel.
- the coolant device 94 is affixed to the exterior surface 95 of the front panel 92 of the pouch 80 by securing the exterior 95 of the coolant device to the exterior surface of the front panel 90 with the wicking material 46 facing the pouch 80.
- Adjacent to the interior surface of the affixed coolant device is the liquid passageway 36 containing the wicking material 46.
- the cooling device casing material is sealed 100 to a portion of the wicking material 46 to form a cavity 102 housing the liquid refrigerant 16 and the liquid refrigerant reservoir 14 including actuator 64.
- On the other side of the wicking material is a thermal spacer 56, followed by the sorbent material 28, the liquid barrier 52, and, finally, the heat-removing material 50.
- a weakened region 103 in the pouch forms an area adapted to be punctured by a plastic straw.
- FIG. 12 shows a conventional beverage container pouch 80 constructed of a plastic-lined, metallicized material, which is heat-sealable.
- the pouch has a top end 82, a bottom end 83, opposing side panels (one shown), 84, and opposing front and back panels, 90 and 92, respectively.
- a brace of coolant devices 102 and 104 are formed as part of, or may be affixed to the front and back panels 90 and 92. In other examples, the coolant devices are formed as part of, or may be affixed to the interior surface of the panels.
- the coolant device 102 is formed as part of the pouch 80 by constructing a wall of the cooling device from a portion 110 of the front panel 90. Adjacent to the interior surface of the wall 110 of the wall of the coolant device is a capillary membrane 112 that provides a liquid passageway from the liquid refrigerant reservoir 14 throughout the length of the sorbent assembly.
- the cooling device casing material is sealed 114 to a portion of the capillary membrane 112 material to form a cavity 116 housing the liquid refrigerant reservoir 14 including actuator 64.
- an insulating material 71 having hydrophilic and hydrophobic surfaces 72 and 73, respectively, followed by the sorbent material 28, the liquid barrier 52, and finally, the heat removing material 50.
- the cooling device decrease the temperature of a beverage in a beverage container by at least about 12°C and in some embodiments at least 15°C or even 20°C after actuation.
- the liquid refrigerant reservoir contains less than 1.5 grams of liquid refrigerant per 30ml (fluid ounce) of beverage in the container.
- the refrigerant liquid is water.
- the sorbent section has a mass of less than 3 grams of sorbent per 30ml (fluid ounce) of beverage.
- the cooling device may decrease the beverage temperature in 10 minutes, or only 5 minutes, or even only 3 minutes.
- the sorbent section occupies less than 5 cubic centimetres per 30ml (fluid ounce) of beverage
- the cooling device occupies less than 15ml (0.5 fluid ounces) per 30ml (fluid ounce) of a beverage in a beverage container.
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Abstract
Description
- The present invention relates to the mechanical arts. In particular, the present invention relates to a sorbent assembly for use with sorbent-driven cooling devices.
- There have been many attempts to manufacture an inexpensive, lightweight, compact cooling device that employs an adsorbent to adsorb a liquid refrigerant such as water. In such a cooling device, there are typically two chambers, one housing the adsorbent and the other housing the liquid refrigerant, in thermal contact with the medium to be cooled. To achieve an effective cooling action, both the adsorbent chamber and the liquid refrigerant chamber must be evacuated. The adsorbent chamber, in particular, must have a substantial vacuum condition (evacuated to less than 8x10-4 mm Hg). When communication is opened between the two chambers, some of the liquid refrigerant is caused to vaporize and flow into the adsorbent chamber, where the vapor is adsorbed by the adsorbent. The latent heat of vaporization causes heat to be removed from the media adjacent the liquid. The adsorption of the vapor causes additional liquid to be vaporized, thus further continuing the cooling process.
- One particular application for which adsorbent-driven cooling devices have been considered is for the rapid chilling of a beverage. One such device is described in U.S. Pat. No. 4,928,495. This patent describes a self-contained cooling device in which a cooling effect is produced by causing a liquid refrigerant to evaporate in a chamber within a beverage container and in the process absorb heat from its surroundings. The resulting refrigerant vapor is then adsorbed by an adsorbent housed in a chamber located outside of the beverage container. While this device may act to cool a beverage placed within the container, the difficulties and costs associated with manufacturing a beverage container with an external adsorbent chamber are a significant impediment to mass production of such containers. In addition, with this arrangement, the path in which the vaporized liquid must travel before it is adsorbed by the adsorbent is long, which prevents the cooling device, from adequately cooling the beverage within a commercially acceptable amount of time.
- Another beverage cooling device is described in U.S. Patent No. 6,151,911. This patent describes a mechanism for cooling a contained beverage by use of an absorption or adsorption substrate in thermal contact with a phase change medium. It is a drawback of this cooling device in that it requires a cylindrical chamber with a lengthy vapor pathway to avoid liquid contact from the phase change medium with the adsorption or adsorption substrate.
- WO 99/37958 discloses a heat transfer device for cooling or heating a beverage contains a refrigerant and a refrigerant take up agent. The device further includes operative means for allowing evaporation of the refrigerant. The take up agent takes up the evaporated refrigerant such that heat absorbed on evaporation of the refrigerant is evolved at the take up agent to enable heat to be transferred to or from a material to be heated or cooled. The take up agent may be an absorbent or adsorbent.
- Accordingly, it should be recognized that there remains a need for an adsorbent assembly and cooling device that is easy and inexpensive to manufacture, is compact and lightweight, and has a short vapor path while providing effective cooling characteristics. The present invention satisfies these and other needs.
- According to the present invention, there is provided an evacuated sorbent assembly as set out in claim 1.
- An embodiment of the present invention provides an evacuated sorbent assembly for coupling to a liquid refrigerant reservoir and another embodiment provides a cooling device comprises of at least one sorbent section, at least one liquid passageway section, and an actuator. The sorbent section contains a sorbent for a liquid refrigerant. The liquid passageway section is adjacent the sorbent section and defines a liquid passageway through a portion of the evacuated sorbent assembly or cooling device to the sorbent section. The liquid passageway contains wicking material of an amount sufficient to prevent the liquid refrigerant from contacting the sorbent. The actuator controls liquid communication between the liquid passageway section and the liquid refrigerant reservoir. The evacuated sorbent assembly includes a vapour-permeable membrane that separates adjacent sorbent and liquid passageway sections whether or not the liquid passageway section contains wicking material.
- Embodiments of the cooling device additionally include a liquid refrigerant reservoir, adjacent the liquid passageway section, and a casing that surrounds the sorbent section, the liquid passageway section, the vapor permeable membrane the liquid refrigerant reservoir, and the actuator.
- In addition to including a wicking material, other embodiments of the present invention include: a heat-removing material, which may be a phase-changing material, in thermal contact with the sorbent; at least one liquid barrier between the heat-removing material and the sorbent; and at least one thermal spacer positioned between the sorbent section and the liquid passageway section. In some embodiments, the thermal spacer is interposed between the sorbent section and the vapor-permeable membrane. In other embodiments, the thermal spacer is interposed between the vapor-permeable membrane and the liquid passageway section. In an example not falling within the scope of the claims (FIG. 10) there is no wicking material, nor vapour permeable membrane, but rather an anisotropic insulation material hydrophobic on one side and hydrophilic on the other replaces the functions of those components. Furthermore, some embodiments include casings made from a flexible material such as a metallicized plastic.
- A feature of the present invention is that it is compact and lightweight. The invention is designed to fit within a host container, i.e., a beverage container. An additional feature of the invention, related to its compact size, is the short vapor path between the liquid refrigerant reservoir and the sorbent. The vapor path is at most several millimeters.
-
- FIG. 1 is a top plan view, partially cut away, of a cooling device in accordance with the invention.
- FIG. 2 is a sectional view of the cooling device of FIG. 1 showing details of a sorbent chamber and a liquid refrigerant reservoir.
- FIG. 2B is a sectional view of an example of a cooling device that does not fall within the scope of the claims.
- FIG. 3 is a plan view of a beverage container with the beverage and the cooling device of FIG. 1 shown in phantom.
- FIG. 4 is a perspective view, partially cut away, of a second alternative embodiment of a cooling device in accordance with the invention.
- FIG. 5 is a sectional view of the cooling device of FIG. 4.
- FIG. 6 is a sectional view of a third alternative embodiment of a cooling device in accordance with the invention.
- FIG. 7 is a perspective view, partially cut away, of a fourth alternative embodiment of a cooling device in accordance with the invention.
- FIG. 8 is a sectional view of a fifth alternative embodiment of a cooling device in accordance with the invention.
- FIG. 9 is a sectional view of a sixth alternative embodiment of a cooling device in accordance with the invention.
- FIG. 10 is a perspective view of a beverage container pouch containing a single cooling device that does not fall within the scope of the claims.
- FIG. 11 is a cross sectional view of the front surface and the cooling device of the pouch shown in FIG. 10.
- FIG. 12 is a perspective view of an alternative beverage container pouch containing two cooling devices, that does not fall within the scope of the claims.
- FIG. 13 is a cross sectional view of the front surface and the cooling device of the pouch shown in FIG. 12.
- FIGS. 2B and 10-13 do not show embodiments falling within the scope of the claims.
- Detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for claims.
- Certain terminology will be used in the following description for convenience in reference only. For example, the word "absorption" refers to the occurrence of a substance (e.g., water vapor) penetrating the inner structure of another (the absorbent). Also, the word "adsorption" refers to the occurrence of a substance (e.g., water vapor) being attracted and held onto the surface of another (the adsorbent). The words "absorption" and "adsorption" include derivatives thereof. The word "sorbent" refers to a material that is either an absorbent and/or an adsorbent.
- The evacuated sorbent assembly and cooling device is shown in the exemplary drawings. With particular reference to FIGS. 1, 2A and B, there is shown a
cooling device 10 housing an evacuatedsorbent assembly 12 adjacent a liquidrefrigerant reservoir 14, which contains aliquid refrigerant 16. The cooling device includes anevacuable casing 18, with opposing ends 20 and 22, and opposingsides - The
casing 18 is made from a flexible material such as a metallicized plastic laminate or a metal foil plastic laminate. Suitable casing materials include flexible films. - The flexibility of the cooling device allows it to be deformed without losing its performance characteristics. For example, the cooling device may be curled and then placed within a beverage container without any degradation in its cooling abilities.
- A sectional view of the
cooling device 10 is shown in FIGS. 2A and B. Included in the evacuatedsorbent assembly 12 are a pair ofsorbent sections sorbent 32 is disposed. The sorbent preferably includes an absorbent material dispersed on, impregnated in, affixed to, or otherwise combined with the porous support material. The porous support material preferably has a high pore volume, and therefore a high surface area, to accommodate the absorption of large amounts of liquid refrigerant 16, in vapor form, by the sorbent. The pore volume is expressed in units of volume per unit mass. The porous support material has a pore volume of at least about 0.8 cc/g, more preferably at least about 1 cc/g, and even more preferably at least about 1.5 cc/g. - In order to accommodate high absorption levels of liquid refrigerant 16, it is also important to control the average pore diameter and pore size distribution of the porous support material. The average pore diameter is preferably at least about 1 nanometer, and typically in the range from about 1 to about 20 nanometers. The average pore diameter distribution is such that there are very few pores having a diameter of less than about 0.5 nanometers. The porous support material can be selected from virtually any material having the above-identified properties. Preferred materials for the porous support material include activated carbon and silica.
- The porous support material can come in a variety of shapes and sizes selected for a particular application. For example, in some embodiments, the porous support material is comprised of small activated carbon pellets having a size in the range of from about 0.5 to 2 millimeters. In alternative embodiments, the porous support material is silica pellets having a size from about 0.25 to 0.5 millimeters. The size of the pellets can be selected to influence the rate at which the vapor from the
liquid refrigerant 16 is absorbed. Larger pellets absorb liquid refrigerant vapor at a slower rate due to increased path length. - It is preferred that the absorbent material have a pore volume that is at least about 50 percent of the pore volume of the porous support material, and even more preferably at least about 66 percent of the pore volume of the porous support material. That is, it is preferred that if the pore volume of the porous support material is about 1.5 cc/g, then the pore volume of the absorbent material is preferably no less than about 0.75 cc/g, more preferably no less than about 1.0 cc/g.
- When the
liquid refrigerant 16 is water, the absorbent material is preferably capable of absorbing at least about 100 percent of its weight in water, more preferably at least about 150 percent of its weight in water, and even more preferably at least about 200 percent of its weight in water. The amount of water that can be absorbed will also be influenced by the relative humidity and temperature. - Any suitable absorbent material can be used. Representative absorbent materials include salts such as calcium chloride, lithium chloride, lithium bromide, magnesium chloride, calcium nitrate, and potassium fluoride. Other suitable absorbent materials include phosphorous pentoxide, magnesium perchlorate, barium oxide, calcium oxide, calcium sulfate, aluminum oxide, calcium bromide, barium perchlorate, and copper sulfate, zeolite 13x, zeolite 5a, silicalite, silica gel, alumina, carbon, modified carbons and the like. Furthermore, the absorbent material may also contain combinations of two or more of these materials.
- Adjacent to each
sorbent section liquid passageway sections adsorbent assembly 12. A pair ofactuators refrigerant reservoir 14 into the liquid passageway sections. In some embodiments, the actuators are mechanically activated. In other embodiments the actuators are pressure activated such that a change in pressure causes the actuators to open and permit communication between the liquid refrigerant reservoir and the liquid passageway sections. - In the embodiment shown in FIG. 2A, a wicking
material 46 is placed within theliquid passageway sections refrigerant reservoir 14 and retains the liquid refrigerant for subsequent vaporization and adsorption by thesorbent 32. In addition, the wicking material absorbs any vaporized liquid refrigerant in the liquid passageway sections that re-condenses before reaching the sorbent. When the liquid refrigerant is water, suitable wicking materials include hydrophilic materials such as microporous metals, porous plastics (polyethylene, polypropylene), cellulose products, sintered heat pipe material, or glass paper, and the like. - No
more wicking material 46 is required than is necessary to draw all of the liquid refrigerant 16 to be adsorbed in the evacuatedsorbent assembly 12. The wicking material has a pore size sufficient to permit capillary action (the drawing of all the liquid refrigerant from the liquid refrigerant reservoir 14) to occur within 60 seconds, and most preferably, within 10 seconds after actuation. - In the embodiments shown in Figs. 4 and 5, the wicking
material 46 provides a direct interface between theliquid refrigerant 16 and thesorbent 32. In these embodiments, the wicking material maintains and holds the liquid refrigerant until it is vaporized and later adsorbed by the sorbent. Sufficient wicking material is used so that non-vaporized liquid refrigerant does not directly contact the sorbent. - Also seen in the embodiment shown in FIG. 2A is a vapor-
permeable membrane 48 separatingsorbent sections liquid passageway sections sorbent 32. In some embodiments, the vapor-permeable membrane is a substantially flat film that is heat-sealed or sealed by an adhesive so as to encase the sorbent and to prevent liquid from contacting the sorbent within the vapor-permeable membrane. Useful vapor-permeable membranes include semi-permeable films such as films available under the trademark TYVEK®. In other embodiments of the present invention, the vapor-permeable membrane is not substantially flat, but is corrugated or otherwise shaped so as to increase surface area and thereby the rate at which vaporized liquid refrigerant passes through the membrane. - In examples not falling within the scope of the claims, the vapour-
permeable membrane 48 may be a hydrophobic coating applied to one or both of the surfaces of thesorbent sections liquid passageway sections - As there can be large temperature differences between the wicking
material 46 and thesorbent sections thermal spacers permeable membranes 48 or between the sorbent sections and the wicking material. The thermal spacers are utilized to insulate heat generated by thesorbent 32. Since the temperature between the wicking material and sorbent sections can vary from 5°C to 150°C, the thermal spacers have a thermal resistance (thermal conductivity at package conditions divided by thickness) preferably less than 100 W/m2K, more preferably less than 50 W/m2K, and most preferably less than 20 W/m2K. The materials utilized for the thermal spacers can be selected from a range of materials known to the art that provide sufficient vapor permeability such as fiberglass, plastic fibers, and plastic foams. - As shown in the example illustrated in FIG. 2B, an insulating
material 71 is placed between thesorbent sections liquid passageway sections material 46,thermal spacers permeable membrane 48 shown in the embodiment illustrated in FIG. 2A. This example does not fall under the scope of the claims. The insulatingmaterial 71 is chosen to inhibit thermal leakback from thesorbent sections material 71 has a collapse strength sufficient to resist about one bar uniaxial load, and limit the shrinkage, due to evacuation, to less than about 20%, more preferably less than about 5%, and most preferably less than about 2%. - In some examples, an anisotropic insulating material containing both a
hydrophilic region 72 and ahydrophobic region 73 is preferred. Such an insulating material inhibits the passage of liquid refrigerant 16 into thesorbent sections sorbent sections - The
hydrophilic region 72 of the insulating material has pores with a relatively large diameter, not less than 10 mm in diameter, on average. The large pores of thehydrophilic region 72 encourage the rapid flow of liquid refrigerant 16 into the material. Thehydrophobic region 73 has pores of a relatively small diameter, typically less than about 2 mm in diameter, so that the un-vaporized liquid refrigerant 16 is inhibited from passing into thesorbent section liquid refrigerant 16 is directed into thesorbent section - The ratio of the thickness of the
hydrophobic region 73 tohydrophilic region 72 is a function of the choice of materials used to form those regions, the quantity of liquid refrigerant 16 in the device, and the desired performance criteria of the device. - The insulating
material 73 can be formed by laminating a hydrophilic material such as cellulose, paper, non-woven or woven cloth formed from fibers of glass, plastic, ceramic or cellulose, to a hydrophobic material. The hydrophobic material can be made by modifying a hydrophilic material with a hydrophobic agent, such as by impregnating a hydrophilic material with wax or adding a hexamethyldisiliazane or a flourinated reactive group to the hydrophilic material. - Alternatively, the insulating material can be formed by surface modification, whereby a sheet of material (either hydrophilic or hydrophobic) is modified to change the surface on one side. In general, the surface of one side of a hydrophobic material can be made hydrophilic by exposure to thermal or plasma treatments or by impregnation with surfactants. The surface of a hydrophilic material can be made hydrophobic by treatment with hydrophobing agents or impregnation of wax-like material.
- The evacuated
sorbent assembly 12 can also contain a heat-removingmaterial 50 in thermal contact with thesorbent sections permeable membrane 48. The heat-removing material is one of three types: (1) a material that undergoes a change of phase when heat is applied (phase-change material); (2) a material that has a heat capacity greater than thesorbent 32; or (3) a material that undergoes an endothermic reaction when brought in contact with a vaporizedliquid refrigerant 16. It will be understood by the skilled artisan that the heat-removing material, for use in a particular application may vary depending on the sorbent utilized, the thermal insulation, if any, between the phase-change material, the liquid refrigerant, and the desired cooling rate. - Suitable heat-removing
materials 50 include paraffin, naphthalene sulphur, hydrated calcium chloride, bromocamphor, cetyl alcohol, cyanamide, eleudic acid, lauric acid, hydrated calcium silicate, sodium thiosulfate pentahydrate, disodium phosphate, hydrated sodium carbonate, hydrated calcium nitrate, neopentyl glycol, hydrated inorganic salts including Glauber's salt, inorganic salts encapsulated in paraffin, hydrated potassium and sodium sulfate, and hydrated sodium and magnesium acetate. The preferred heat-removing material is an inorganic salt that has been melted and re-solidified to form a monolith (thereby reducing the volume of the heat-removing material by approximately 30%). - The heat-removing
material 50 removes some of the heat from thesorbent sections - Another requirement of phase-change heat-removing
material 50 is that it change phase at a temperature greater than the expected ambient temperature of the material to be cooled, but less than the temperature achieved by thesorbent sections liquid refrigerant 16. For example, when the current invention is employed in acooling device 10 for insertion into a typical beverage container, the phase change should take place at a temperature above about 30 °C, preferably above about 35 °C but preferably below about 70 °C, and most preferably below about 60 °C. - When absorbing heat, a phase-change heat-removing
material 50 may generate by-products such as water, aqueous salt solutions, and organics. Therefore, depending on the particular heat-removing material utilized, in some embodiments it is desirable to includeliquid barriers sorbent sections - The liquid
refrigerant reservoir 14 is positioned immediately adjacent oneend 22 of thecasing 18. This arrangement provides an advantage over prior art sorbent chambers that typically employ devices with long vapor paths which decrease the effectiveness of the vaporization of theliquid refrigerant 16. In addition, the short vapor paths allow the evacuatedsorbent assembly 12 to operate at a much higher pressure level than previous sorbent assemblies. - In some embodiments, the liquid
refrigerant reservoir 14 is a plastic 60, typically made of polyethylene, that is filled and heat sealed along itsedges 62 enclosing theliquid refrigerant 16. Weakenedportions sensitive actuators - The liquid refrigerant 16 stored in the liquid
refrigerant reservoir 14 has a high vapor pressure at ambient temperature so that a reduction of pressure will produce a high vapor production rate. In addition, the liquid refrigerant has a high heat of vaporization. The vapor pressure of the liquid refrigerant at 20°C is typically at least about 9 mm Hg, preferably at least about 15 or 20 mm Hg. Suitable liquid refrigerants include various alcohols, such as methyl alcohol or ethyl alcohol; ketones or aldehydes such as acetone and acetaldehyde; and hydrofluorocarbons such as C318, 114, 21, 11, 114B2, 113, 112, 134A, 141B, and 245FA. The preferred liquid refrigerant is water because it is plentiful and does not pose any environmental problems while providing the desired cooling characteristics. - In some embodiments, the
liquid refrigerant 16 is mixed with an effective quantity of a miscible nucleating agent (or a partial miscible nucleating agent) having a greater vapor pressure than the liquid refrigerant to promote ebullition so that the liquid refrigerant evaporates even more quickly and smoothly, while preventing the liquid refrigerant from super-cooling and thereby decreasing the adsorption rate in thesorbent 32. Suitable nucleating agents include ethyl alcohol, acetone, methyl alcohol, isopropyl alcohol and isobutyl alcohol, all of which are miscible with water. For example, a combination of a nucleating agent with a compatible liquid might be a combination of 5% ethyl alcohol in water or 5% acetone in methyl alcohol. The nucleating agent preferably has a vapor pressure at 25°C of at least about 25 mm Hg, and, more preferably, at least about 35 mm Hg. Alternatively, a solid nucleating agent may be used, such as a conventional boiling stone used in chemical laboratory applications. - During manufacturing, the
sorbent sections casing 18 along with the liquidrefrigerant reservoir 14 prior to heat sealing the casing. Depending upon the embodiment, wickingmaterial 46 is placed adjacent the sorbent sections and encased with a vapor-permeable membrane 48. Furthermore, in some embodiments, the vapor-permeable membrane also encases a layer of heat-removingmaterial 50 in thermal contact with thesorbent 32,liquid barriers thermal spacers liquid passageway sections material 71 is placed between the sorbent sections andliquid passageway sections sides - The method of use and operation of the evacuated
sorbent assembly 12 andcooling device 10, constructed as described above, proceeds as follows. Initially, theactuators liquid passageways refrigerant reservoir 14 is aplastic bag 60 with weakenedportions casing 18 and liquid refrigerant reservoir. The external pressure ruptures the weakenedportions -
Liquid refrigerant 16, except for a small amount that is instantly vaporized, is introduced into the evacuatedadsorbent assembly 12 from the liquidrefrigerant reservoir 14 via theliquid passageways material 46. The vaporized liquid refrigerant then passes through the vapor-permeable membrane 48, and enters thesorbent sections sorbent 32. In examples not falling under the scope of the claims, the liquid refrigerant collects in the hydrophilic region of the insulation material. The vaporized refrigerant then passes through thehydrophilic region 73 andabsorbent sections - Vaporization of the liquid refrigerant 16 causes a cooling effect on the outside of the
cooling device 10 which, as shown in FIG. 3 can be used to cool abeverage 80 in abeverage container 82. Less than 1.5 grams of liquid refrigerant water per 30 millilitres (fluid ounce) of beverage, less than 3 grams ofsorbent 32 per 30ml (fluid ounce) of beverage, and less than 5 cubic centimetres ofsorbent 32 per 30ml (fluid ounce) of beverage is required to cool the beverage by 22°C in preferably less than 10 minutes, more preferably less than 5 minutes, and most preferably less than 3 minutes after actuation. Also, the cooling device occupies less than 15ml (0.5 fluid ounces) per 30m) (fluid ounce) of beverage. - Those skilled in the art will recognize that various modifications and variations can be made in the evacuated
sorbent assembly 12 andcooling device 10 of the invention and in the construction and operation of the evacuated sorbent assembly and cooling device without departing from the scope of the claims. For example, the evacuated sorbent assembly may be used as part of a cooling device which may be wrapped around the outer circumference of a beverage container rather than being placed therein. In addition, the sorbent assembly need not be symmetrical, but rather, it can be asymmetrical and arranged, for example, such that the layer adjacent thecasing 18 is thesorbent section 28, with the next layer being the vapor-permeable membrane 48, and with the final layer being the wickingmaterial 46. - Also, the sorbent assembly and cooling device can be arranged in a spherical configuration as shown in FIGS. 4, 5, and 6. In the embodiment shown in FIG. 6, the liquid
refrigerant reservoir 16 is adjacent the length of the evacuatedsorbent assembly 12. FIG. 7 shows another embodiment of the present invention where the evacuated sorbent assembly has a polygonal cross-section. In other embodiments, as shown in FIGS. 8 and 9, two or more evacuated sorbent assemblies are adjacent to a single liquid refrigerant reservoir. - FIG. 10 shows a conventional
beverage container pouch 80 constructed of a plastic-lined, metallicized material, which is heat-sealable. The pouch has atop end 82, abottom end 83 formed bypanel 84, to create a base for the beverage container pouch, opposing side panels (one shown) 85, and opposing front and back panels, 90 and 92, respectively. Asingle coolant device 94 is formed as part of, or affixed to the exterior surface of the front panel. In other examples, the coolant device may be formed as part of, or affixed to the interior surface of the panel. - As best seen in FIG. 11, the
coolant device 94 is affixed to theexterior surface 95 of thefront panel 92 of thepouch 80 by securing theexterior 95 of the coolant device to the exterior surface of thefront panel 90 with the wickingmaterial 46 facing thepouch 80. Adjacent to the interior surface of the affixed coolant device is theliquid passageway 36 containing the wickingmaterial 46. The cooling device casing material is sealed 100 to a portion of the wickingmaterial 46 to form acavity 102 housing theliquid refrigerant 16 and the liquidrefrigerant reservoir 14 includingactuator 64. On the other side of the wicking material is athermal spacer 56, followed by thesorbent material 28, theliquid barrier 52, and, finally, the heat-removingmaterial 50. In practice, the user squeezes the portion of casing defining the liquid refrigerant cavity to actuate theactuator 64 and release the liquid refrigerant 16 into the liquid passageway. A weakenedregion 103 in the pouch (FIG. 10) forms an area adapted to be punctured by a plastic straw. - FIG. 12 shows a conventional
beverage container pouch 80 constructed of a plastic-lined, metallicized material, which is heat-sealable. The pouch has atop end 82, abottom end 83, opposing side panels (one shown), 84, and opposing front and back panels, 90 and 92, respectively. A brace ofcoolant devices 102 and 104 are formed as part of, or may be affixed to the front andback panels - As shown in FIG. 13 for one of the coolant devices, the
coolant device 102 is formed as part of thepouch 80 by constructing a wall of the cooling device from aportion 110 of thefront panel 90. Adjacent to the interior surface of thewall 110 of the wall of the coolant device is acapillary membrane 112 that provides a liquid passageway from the liquidrefrigerant reservoir 14 throughout the length of the sorbent assembly. The cooling device casing material is sealed 114 to a portion of thecapillary membrane 112 material to form acavity 116 housing the liquidrefrigerant reservoir 14 includingactuator 64. On the other side of the capillary membrane, is an insulatingmaterial 71, having hydrophilic andhydrophobic surfaces sorbent material 28, theliquid barrier 52, and finally, theheat removing material 50. - Some embodiments of the cooling device decrease the temperature of a beverage in a beverage container by at least about 12°C and in some embodiments at least 15°C or even 20°C after actuation. In these embodiments, the liquid refrigerant reservoir contains less than 1.5 grams of liquid refrigerant per 30ml (fluid ounce) of beverage in the container. In some embodiments, the refrigerant liquid is water. Also, in some embodiments, the sorbent section has a mass of less than 3 grams of sorbent per 30ml (fluid ounce) of beverage. Depending upon the embodiment, the cooling device may decrease the beverage temperature in 10 minutes, or only 5 minutes, or even only 3 minutes. In some embodiments the sorbent section occupies less than 5 cubic centimetres per 30ml (fluid ounce) of beverage, and the cooling device occupies less than 15ml (0.5 fluid ounces) per 30ml (fluid ounce) of a beverage in a beverage container.
- The invention is defined with reference to the following claims.
Claims (22)
- An evacuated sorbent assembly (12) for coupling to a liquid refrigerant reservoir comprising:at least one sorbent section (28, 30) containing a sorbent (32) for a liquid refrigerant (16);at least one liquid passageway section (34, 36) adjacent the sorbent section (28, 32), the liquid passageway section (34, 36) defining a liquid passageway through at least a portion of the evacuated sorbent assembly (12) to the sorbent section (28, 30); andan actuator (42, 44) for actuating liquid communication between the liquid passageway section (34, 36) and the liquid refrigerant reservoir (14),characterized in that the sorbent assembly further comprises
a vapour-permeable membrane (48) separating adjacent sorbent and liquid passageway sections (28, 30, 34, 36), wherein the vapour-permeable membrane is semi-permeable such that only vaporized refrigerant may pass through the vapour-permeable membrane. - The evacuated sorbent assembly of claim 1, further comprising a heat-removing material (50) in thermal contact with the sorbent (32).
- The evacuated sorbent assembly of claim 2, wherein the heat-removing material (50) is a phase-change material.
- The evacuated sorbent assembly of claim 2, further comprising at least one liquid barrier (52, 54) interposed between the heat-removing material (50) and the sorbent (32).
- The evacuated sorbent assembly of any one of claims 1 to 4, further comprising at least one wicking material (46) disposed in the liquid passageway section (34, 36).
- The evacuated sorbent assembly of any one of claims 1 to 5, further comprising at least one thermal spacer (56, 58) interposed between the sorbent section (28, 30) and the vapour-permeable membrane (48).
- The evacuated sorbent assembly of any one of claims 1 to 5, further comprising at least one thermal spacer (56, 58) interposed between the vapour-permeable membrane (48) and the liquid passageway section (35, 36).
- The evacuated sorbent assembly of any one of claims 1 to 5, further comprising a liquid managing insulation material which has a hydrophilic region on one side and a hydrophobic region on the opposite side, interposed between the vapour permeable membrane (48) and the liquid passageway section (34, 36).
- The evacuated sorbent assembly of any one of claims 1 to 8, wherein the sorbent section (28, 30) is supported on a flexible monolith.
- A cooling device (10) housing an evacuated sorbent assembly (12) according to any one of claims 1 to 9, said device comprising:a casing (18) surrounding said at least one sorbent section (28, 30);said liquid refrigerant reservoir (14) being adjacent the liquid passageway section (34, 36).
- The cooling device of claim 10, wherein the casing (18) is made from a flexible material.
- The cooling device of claim 11, wherein the flexible material is metallicized plastic.
- The cooling device of any one of claims 10 to 12, wherein the sorbent section (28, 30) has a mass of less than 3 grams per 30ml (fluid ounce) of beverage and the liquid refrigerant reservoir (14) contains less than 1.5 grams of liquid refrigerant per 30ml (fluid ounce) of beverage.
- The cooling device of any one of claims 10 to 13, wherein the sorbent section (28, 30) occupies less than 5 cubic centimetres per 30ml (fluid ounce) of beverage and the liquid refrigerant reservoir (14) contains less than 1.5 grams of liquid refrigerant per 30ml (fluid ounce).
- The cooling device of claim 13 or 14, wherein the liquid refrigerant (16) is water.
- The cooling device of claim 10, wherein the cooling device (10) occupies less than 15ml (0.5 fluid ounces) per 30ml (fluid ounce) of a beverage in a beverage container.
- A beverage container with integrated cooling device, said beverage container comprising a flexible, plastic lined, beverage pouch (80) with a cooling device (94) according to any one of claims 10 to 16 integrated into one or more of the side walls (85).
- The beverage container of claim 17, further comprising a weakened region (103) in a portion of the container that does not house the cooling device (10), whereby a straw may be inserted.
- The beverage container of claim 17 or 18, further comprising a beverage such as juice held within the container.
- A method of manufacturing a self-cooling beverage container according to any one of claims 17 to 19, comprising the steps of:integrating a cooling device according to any one of claims 10 to 16 into side panels of flexible plastic lined material;heat sealing the side panel with integrated device to a substantially similar side panel, without a cooling device, along the side and bottom edges, thereby forming an open pouch;filling the opened pouch with a beverage; andsealing the top edge of filled open pouch.
- The method of claim 20, wherein a weakened region is formed in a portion of the pouch, whereby a sealed and filled pouch may be pierced with a plastic straw.
- The method of claim 20 or 21, wherein a bottom panel constructed of substantially similar material as the side panels also plastic lined is heat sealed at the bottom and in between the side panels thereby forming a base upon which the beverage container can stand.
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US09/844,295 US6474100B1 (en) | 2001-04-25 | 2001-04-25 | Evacuated sorbent assembly and cooling device |
PCT/US2001/051295 WO2002040929A2 (en) | 2000-10-18 | 2001-10-16 | Evacuated sorbent assembly and cooling device |
US844295 | 2010-07-27 |
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NL8502615A (en) * | 1985-09-25 | 1987-04-16 | Elson International Trading B | Plastic bag, esp. for beverage, with plugged filling opening - has closable and foldable drinking tube, is insertable in insulating bag, contains at least two gel-filled holders, has ribbed inner surface |
JPH0788996B2 (en) * | 1986-09-24 | 1995-09-27 | 品川燃料株式会社 | Cooling method |
US4736599A (en) * | 1986-12-12 | 1988-04-12 | Israel Siegel | Self cooling and self heating disposable beverage cans |
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US4993239A (en) * | 1987-07-07 | 1991-02-19 | International Thermal Packaging, Inc. | Cooling device with improved waste-heat handling capability |
JP2596169B2 (en) * | 1990-04-12 | 1997-04-02 | 松下電器産業株式会社 | Cooler |
US5168708A (en) * | 1991-09-23 | 1992-12-08 | Israel Siegel | Disposable and reusable valveless sorption self-cooling and self-heating containers |
DE4207857A1 (en) * | 1992-03-12 | 1993-09-16 | Bayerische Motoren Werke Ag | Vapour pressure refrigerator for car air conditioning - has inclined evaporator with capillary feed from water reservoir exiting downwards to input of zeolite sorption container |
US5626022A (en) * | 1994-05-31 | 1997-05-06 | Insta-Heat, Inc. | Container with integral module for heating or cooling the contents |
CN1293746A (en) * | 1998-01-24 | 2001-05-02 | 诺丁汉大学 | Heat transfer device |
EP1163480A4 (en) * | 1999-02-26 | 2006-02-01 | Tempra Tech Inc | Preparation of heat sink materials |
EP1269089B1 (en) * | 2000-03-02 | 2004-10-27 | Tempra Technology, Inc. | Portable heating/cooling and dispensing devices |
-
2001
- 2001-10-16 MX MXPA03003431A patent/MXPA03003431A/en active IP Right Grant
- 2001-10-16 WO PCT/US2001/051295 patent/WO2002040929A2/en active IP Right Grant
- 2001-10-16 AU AU3978402A patent/AU3978402A/en active Pending
- 2001-10-16 CA CA002426199A patent/CA2426199A1/en not_active Abandoned
- 2001-10-16 AU AU2002239784A patent/AU2002239784B2/en not_active Ceased
- 2001-10-16 DE DE60126501T patent/DE60126501T2/en not_active Expired - Lifetime
- 2001-10-16 AT AT01987582T patent/ATE353427T1/en not_active IP Right Cessation
- 2001-10-16 EP EP01987582A patent/EP1328763B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO2002040929A2 (en) | 2002-05-23 |
ATE353427T1 (en) | 2007-02-15 |
WO2002040929A3 (en) | 2002-09-06 |
DE60126501T2 (en) | 2007-11-29 |
AU3978402A (en) | 2002-05-27 |
EP1328763A2 (en) | 2003-07-23 |
MXPA03003431A (en) | 2005-01-25 |
CA2426199A1 (en) | 2002-05-23 |
AU2002239784B2 (en) | 2007-01-25 |
DE60126501D1 (en) | 2007-03-22 |
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