US2794331A - Cooling unit for absorption refrigeration apparatus - Google Patents

Cooling unit for absorption refrigeration apparatus Download PDF

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Publication number
US2794331A
US2794331A US456920A US45692054A US2794331A US 2794331 A US2794331 A US 2794331A US 456920 A US456920 A US 456920A US 45692054 A US45692054 A US 45692054A US 2794331 A US2794331 A US 2794331A
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evaporator
storage space
conduit
cooling
heat
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US456920A
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English (en)
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Kogel Wilhelm Georg
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Electrolux AB
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Electrolux AB
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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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • 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
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/10—Sorption machines, plants or systems, operating continuously, e.g. absorption type with inert gas
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/027—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures of the sorption cycle type

Definitions

  • My invention is concerned with the cooling of a thermally insulated interior of a refrigerator, and more particularly to cooling units for refrigeration apparatus for eecting such cooling.
  • I accomplish this by positioning an evaporator element of refrigeration apparatus in the thermally insulated wall structure of a refrigerator cabinet, and by employing a heat transmitting member having a first part which is heat conductively connected to the evaporator element and a second part which extends into a compartment formed by the wall structure, such second part passing through an opening formed in an inner lining of the wall structure.
  • Another object is to provide such an improvement for transmitting cooling effect to the upper part of a freezing compartment when another evaporator element of the refrigeration apparatus is associated with the bottom of such a compartment.
  • a further object is to provide such an improvement for transmitting cooling effect to the upper part of a eezing compartment in which liquid refrigerant is always made available to the evaporator element heat conductively connected to the heat transmitting member, even when the evaporator element associated with the bottom of the freezing compartment is at an adequately low temperature.
  • a still further object is to provide such an improvement for transmitting cooling effect to a compartment of a refrigerator cabinet in which the evaporator element positioned in the thermally insulated wall structure of the cabinet forms part of absorption refrigeration apparatus of the inert gas type.
  • a still further object is to provide such an improvement for transmitting cooling eifect to the upper part of a freezing compartment in which the evaporator elements form part of such absorption refrigeration apparatus, and supplying heat to the latter at one rate when the temperature of the other evaporator element associated with the bottom of the freezing compartment tends to rise above a desired low value, and also supplying heat to the refrigeration apparatus at a second lower rate, even when the temperature of the other evaporator element is at the desired low value, so that liquid refrigerant will always be made available to the evaporator element heat conductively connected to the heat transmitting member.
  • Fig. l is a fragmentary vertical sectional view of a refrigerator embodying the invention.
  • v Fig. 2 is a horizontal sectional view, taken at line 2-2 of-Fig. l,- to illustrate details more clearly;
  • Fig. 3 illustrates more or less diagrammatically absorption refrigeration apparatus of the inert gas type which may be employed in the refrigerator shown in Figs. l and 2;
  • Fig. 4 illustrates an alternative form of a cooling unit which may be employed in the embodiment of Figs. 1 and 2;
  • Fig. 5 is a fragmentary vertical sectional view of a refrigerator illustrating another embodiment of the invention.
  • Fig. 6 illustrates more or less diagrammatically parts of the refrigeration apparatus employed in the refrigerator shown in Fig. 5;
  • Fig. 7 illustrates more or less diagrammatically additional parts of the refrigeration apparatus employed in the refrigerator shown in Fig. 5.
  • a refrigerator comprising a cabinet 10 having an inner metal shell 11 arranged to be supported Within an outer metal shell 12 and insulated therefrom with any suitable insulating material 14.
  • the inner metal shell or lining denes a thermally insulated interior 15 into which access is afforded by a door (not shown) Which is hinged to the front of the cabinet and in its closed position closes the access opening 16.
  • the thermally insulated interior 15 provides a storage space formed by the thermally insulated wall structure of the cabinet 10.
  • the thermally insulated storage space or compartment 15 of the cabinet 10 is arranged to be cooled and maintained at a low temperature by absorption refrigeration apparatus of a uniform pressure type, like that diagrammatically shown in Fig. 3, in which an inert gas or pressure equalizing fluid is employed.
  • absorption refrigeration apparatus has been illustrated in a more or less conventional manner apart from the refrigerator cabinet shown in Figs. 1 and 2.
  • a refrigerant fluid such as liquid ammonia, for example, is introduced through a conduit 17 into an evaporator 18.
  • an inert gas such as hydrogen, for example, to produce refrigeration and abstract heat.
  • the resulting gas mixture of refrigerant and inert gas ows from the evaporator 1S through an outer passage of a gas heat exchanger 19 and vertical conduit 20 into an absorber comprising a Vessel 21 and a looped coil 22.
  • a suitable absorbent such as water, for example, which is introduced into coil 22 through a conduit 23.
  • the hydrogen or inert gas which is practically insoluble and weak in refrigerant, returns to the evaporator 1S from coil 22 through a conduit 29a, an inner passage of the gas heat exchanger 19 and a conduit 24.
  • the generator 28 comprises a heating flue 29 having the vapor lift tube 27 and a boiler pipe 30 in thermal exchange relation therewith, as by welding, for example.
  • a suitable source of heat as an electrical heating element or a gas burner 31, for example, liquid from the inner passage of the heat exchanger 26 is raised by vapor lift action through tube 27 into the upper part of the boiler pipe 30.
  • the weakened absorption liquid from which refrigerant vapor has been expelled is conducted from boiler pipe 38 through a conduit 34, outer passage of the liquid heat exchanger 26 and conduit 23 into the upper part of the coil 22.
  • the lower end of the condenser 32 is connected by a conduit 35 to the gas circuit, as to the upper part of conduit 26, for example, so that any non-condensable gas which may pass into the condenser, can ow to the gas circuit and not be trapped in the condenser.
  • the evaporator 18 comprises pipe or conduit sections 18a and 18h which are connected by a bend 36 and for convenience may be referred to as evaporator elements.
  • the evaporator elements 18a 'and 18h are connected in series relation with inert gas from conduit 24 owing through evaporator element 18a in the presence of and in parallel ow with liquid refrigerant which is introduced through conduit 17.
  • Unevaporated liquid refrig-v erant is conducted from the lower part of evaporator element 18a through the connecting bend 36 into the lower evaporator element 18b for flow in the latter in the presence of and in parallel ow with the inert gas.
  • the gas in the upper evaporator element 18a contains a lesser amount of refrigerant vapor than the gas in the lower evaporator element 1819.
  • the partial vapor pressure of the refrigerant is a gradient, so that the temperature of liquid refrigerant in the evaporator elements is also a gradient, the evaporating temperature of the liquid being lower in the upper evaporator element 18a which desirably constitutes the freezing portion of the evaporator 18.
  • the gas heat exchanger 19 is embedded in a body of heat insulating material 38 retained in a removable cover or closure 39 for an opening 40 in the rear insulated Wall 41 of the cabinet 10.
  • the cover 39 comprises a rectangular frame 42 formed of suitable material, such as wood, having inner and outer plates 43 and 44, respectively.
  • the inner plate 43 is depressed about its peripheral edge so that, when the cover 39 is positioned at the opening, the greater part of the inner plate will be substantially flush with the inner shell 11, and the depressed peripheral edge thereof will bear against a gasket 4S adapted to be held against the inner shell 1'1.
  • the outer plate 44 which is of greater area than the opening 40, is removably secured at 46 to the outer shell 12.
  • the gas heat exchanger 19 is arranged in a lengthwise position within the cover 39, and is disposed in the plane of the rear wall 41 of the cabinet whenthe cover 39 is positioned at the opening 40.
  • a part of the liquid refrigerant supply conduit 17, at the section thereof having the conduits 37 connected thereto, is positioned above and to one side of the gas heat exchanger, .as seen in Figs. l and 2.
  • the liquid refrigerant connection, and the connections 2? and 20a to the gas heat exchanger 19 are embedded in the insulation 38. It will be seen in Figs.
  • liquid refrigerant conduit 17 and conduits 20 and 26a in the gas 4circuit project through openings in the rear or outer plate 44 of the coverk 39 into a vertically extending'space 47 at the rear of the cabinet.
  • Other partsof the refrigeration system,vsu'ch 4 as the condenser and absorber, for example, are located in the space 47 to promote air cooling of these parts.
  • the cover 39 desirably may form a unitary part of the refrigeration system. In such case, the cover 39 will tit snugly in the opening 40 formed by frame structure 48 in the rear wall 41 when the different parts of the refrigeration system are positioned in the Vvertically extending space 47.
  • the evaporator 18 of the refrigeration apparatus is positioned in the thermally insulated wall structure of the cabinet 10; and members 50 and 51, which are heat conductively -connected to the evaporator 18, extend into the compartment 15 through an opening 52 in the lining 11.
  • the conduit sections or elements 18a ⁇ and 18b of the Vevaporator 18 are positioned in the cover part 39 of the rear wall 41 of the cabinet 10, and are com-A pletely embedded in the insulating material 38.
  • the evaporator elements 18a and 181i are located closely adjacent to the inner wall plate 43 of the cover 39, so that these elements will be as near as possible to the inner lining 11 when the cover or closure 39 is placed in position in the opening 40 of the rear insulated wall 41.
  • the members 50 and 51 are formed of a good heat conducting material like aluminum, for example, for effectively transmitting cooling effect to the storage space or compartment 15.
  • the member 50 which extends across a major portion of the storage space 15 between the lateral side walls thereof, is bent about the top evaporator element 18a and includes an end portion 50a which extends forwardly through the opening 52 in the lining 11 and serves as a spacer between the members 50V and 51.
  • the member 51 is bent about the bottom conduit section 18b and includes an end portion 51a which also extends forwardly through the opening 52 in the lining 11'sand is in contact with the underside of the member 51.
  • these parts are effectively united to one another in any suitable manner.
  • a suitable gasket (not shown) may be provided at the narrow opening 52 yand at the adjacent opening in plate 43 of the cover 39 to thermally insulate the members 50 and 51 and end portions 50a and 51a thereof from the regions of the inner lining 11 at the immediate vicinity of such opening,
  • the evaporator 18 Since the evaporator 18 is Acompletely embedded in the insulating material 38, essentially the entire useful cooling effect produced by the evaporator is effectively transferred to the parts of the Vmetallic members 50 and 51 extending into the insulated wall structure through the ope-ning 52 in the inner lining 11.
  • the rearwardly extending parts of the members S0 and 51 passing into the insulated wall structure serve as heat conductors for transmitting cooling effect to the parts of the members 50 and 51 disposed within the storage space 15.
  • Figs. l Iand 2 it will be seen that the members 50 and 51 essentially form part of a single unit 53 for transmitting cooling effectV to storage space 15 which is heat conductively connected to both the low and higher temperature evaporator elements 18a and 18b of the evaporator 18.
  • the refrigeration apparatus desirably is operated so that the top member 5 which is heat conductively connected to the freezing portion 18er of the evaporator 18, can be effectively employed for freezing water and other matter to be frozen.
  • the member 50 is essentially at and forms a shelf which is closely .adjacent to and at the vicinity of the ceiling of the storage space 15, and upon which may be placed matter to be frozen, such as ice trays filled with water, for example.
  • Both' the members 5i) and 51 are'elfeclively employed for cooling air in the storage space 15.
  • the area of the bottom member 51 preferably is the same Ias that of the top member 50.
  • air owing in intimate Contact with the underside of member 51 is cooled and tends to move downwardly in the storage space 15, thereby displacing warmer air which moves upwardly into intimate contact with the underside of the member 15.
  • natural circulation of air is induced in the storage space 15, in the manner just described, such air circulation being greater in that part of storage space 15 below the member 50 than in the part thereof above the member 50.
  • the member 50 is primarily employed for freezing water and other matter, although it also is effective to cool air owing in intimate contact therewith. Such air cooled by member 50 moves downwardly about the peripheral edge portions of the members 50 and 51 to displace warmer -air that moves upwardly in the space 15.
  • the members heat conductively connected to the evaporator elements 18a and 18b and disposed in the storage space 15 may be separated from one another.
  • a modified arrangement is shown in Fig. 4 in which a member 150 is heat conductively connected to the low temperature evaporator element 18a, and a member 151 is ,heat conductively connected to the evaporator element 13b.
  • the member 150 is formed to provide two horizontally extending shelves or supporting surfaces 150a and 150b which are essentially tangential to the top and bottom sides of the top evaporator element 18a, and desirably extend across a major portion of the distance between the lateral side walls of the storage space 15. Since the evaporator element 18a constitutes the freezer portion of the evaporator, the shelves 150a and 150b may be eiectively employed for freezing water in shallow trays and other matter to be frozen.
  • the member 151 having an Iarea smaller or the same as that of the shelves 150:1 and 15911, may be provided with additional heat transfer members 151a at the underside thereof to provide a relatively extensive heat transfer surface for cooling air in the storage space 15. Also, the shelf 150 may occupy one part of the storage space 15 land the other shelf 151 may be laterally olset from the shelf 150 and occupy another part ofthe storage space 15;
  • a number of openings 152a, 152b and 152e are necessary in the inner lining 11 through which the rearwardly extending parts of the Vmembers 150 and 151 extend into the insulated wall structure of the refrigerator cabinet.
  • a suitable gasket (not shown) may be provided at each of the openings 152a, 152b :and 152C and at the adjacent openings at the inner plate 43 of the cover 39 to thermally insulate the members 150 and 151 from the regions of the inner lining 11 at such openings.
  • a unit 153 similar to the unit 53 in Figs. l and 2, is provided to transmit cooling eiect to the storage space to supplement the cooling eifect produced by the evaporator elements 118a and 118! of evaporator 11S.
  • the evaporator 11'8 forms .part of absorption refrigeration apparatus of the inert gas type and like that shown in lFig. 3 and described above.
  • the gas heat exchanger 119 is disposed lengthwise of and embedded in insulation 138 retained in a cover 139 which closes an opening 140 in the rear insulated Wall 141 of the cabinet 110.
  • the evaporator elements 118a and 118b which are positioned in the :storage space 115, are in the form of looped coils disposed one above the other. Since the inert gas ilows successively through the evaporator elements 118a and 118b, the ⁇ evaporating temperature of liquid is lower in the evaporator element 118:1 which constitutes the freezing portion of the evaporator 118.
  • a plate 154 may be heat conductively connected to the top part of the looped coil forming evaporator element 118a to provide a suitable supporting surface to receive matter 155 ⁇ to be frozen, such as ice trays containing water, for example.
  • the upper looped coil and plate 154 connected thereto desirably extend across the full Width of the storage space 115 between the lateral side walls of the cabinet 11i).
  • the higher temperature evaporator element 11819 is primarily employed to cool air in the storage space 115 and desirably may have heat transfer members 156 iixed thereto to provide a relatively extensive heat transfer surface to promote such air cooling.
  • the generator 128 forming a part of 'the refrigeration apparatus of Figs. 5 and 6 is illustrated in Fig. 7.
  • the generator 128 comprises a boiler pipe 130 heat conductively connected to a heating tube 129 within which is positioned an electrical heat-ing element 131.
  • Absorption liquid from which refrigerant vapor has ⁇ been expelled flows from the bottom of boiler .pipe 130 into the lower end of a vapor-liquid lift 127 in thermal exchange relation with the heating tube 129.
  • An expansible Huid thermostat which contains a suitable volatile -uid and responds to changes in temperature of evaporator element 11811, is provided to control a switch 162 connected in the electrical circuit of the heating element 131.
  • the expansible fluid thermostat includes a Ibulb 163 which is in thermal exchange relation with the evaporator element 11811 and is connected by a tubular member 164 to a control device 165 operatively lassociated with the switch 162.
  • the control arrangement shown is of the on and off type in which the thermal bulb 163 vbecomes effective to cause control device 165 to close switch 162 and complete an electrical circuit for the heating element 131 when the temperature of evaporator element 11811 increases due to increase in load on the refrigerator 110.
  • the thermal bulb 163 becomes effective ⁇ t-o cause control device 165 to open switch 162 and open the electrical circuit for the heating element.
  • Electrical energy is supplied to the heating element from a source of supply through conductors 166 and 167, the switch 162 being connected in the conductor 166.
  • a manually operable switch 168 is also connected in conductor 166 for manually controlling the supply of electrical'energy to the heating element.
  • the plate 154 connected to the upper evaporator element 11811 forms a partition to divide the ystorage space 11S into a freezing compartment 11511 and a higher temperature food compartment 1156, the freezing compartment 1,1511 being of adequate depth to receive ice trays, frozen food packages and other matter to -be frozen.
  • the freezing compartment 11511 may be provided with a hood 16311, as indicated in dotted lines in Fig. 5, having a sui-table front closure member (not shown) Ywhich may be hinged to the front of the hood.
  • I provide the member 153 in thefreezing compartment 11511 which transmits cooling effect to the extreme upper part of such compartment and supplements the refrigerating effec-t produced by the evaporator element 11811 to which the plate 154 is connected.
  • the member 153 which may lbe'iforrned of a suitable metal like copper or aluminum, for example, desirably extends across .the entire wid-th of the freezing compartment 11511 for transmitting cooling effect to all regions thereof.
  • the member ⁇ 153 includes alrst horizontally disposed section in the freezing compartment 11511, whichextends and passes through an opening 152 in the inner lining 111 into the removable cover 139.
  • a gasket 170 is provided about the member 153 at the region thevlatter .passes through the openings in the lining 111 and plate 143, so that the member 153 willV be thermallyA insulated from such aperturd parts of the refrigerator ⁇ cabinet.
  • the member 153 is bent within the cover 139 to provide a downwardly depending second portion which extends about the evaporator element 1181 ⁇ ⁇ and is securely clamped thereto, as indicated at 171. Since inert gas weak in 'refrigerant first flows in the presence of liquid refrigerant in the evaporator element 118C, liquid refrigerant evaporates at the lowest temperature in this evaporator element. The low temperature cooling effect produced by evaporator element 1181 ⁇ is transferred to the verticalpart of member 153 which serves to transmit such cooling effect to vthe horizontal part of the member 153 which is positioned in the freezing compartment 11511.
  • the heating element 131 comprises two parts or sections, only one of which is affected by the operation of the thermostatically controlled switch 162.
  • Fig. 7 it will be seen that electrical energy is supplied to one part ofV heating element 131 through an electrical cir-V cuit which includes conductor 166, manual switch 168, conductor 172 and conductor 167.
  • the circuit just described by-passes the switch 162 so that, when the manually operated switch 168 is closed, electrical energy will always be supplied to one part of the heating element 131.
  • Electrical energy is supplied to the other part of the heating element 131 through l'an electrical circuit which includes conductor 166 and switch 162 connected therein, and conductor 167.
  • the thermostatic control becomes effective to close switch 162 and electrical energy is supplied to both parts or sections of heating element 131.
  • the liftY tube 12711 is of such size that vapor is expelled from solution therein at a suiciently rapid rate,v when Yelectrical energy is being supplied to both parts or sections of the heating element 131, whereby liquid can be raised therein by vapor ilift action.
  • electrical energy is supplied only to the one part of the heating element 131 and the switch 162 is open, vapor is evolved at a rate insuflicient to cause lifting of liquid by vapor lift action through the lift tube 127:1.
  • the internal diameter of the second lift tube 127b is such that liquid can be effectively raised therein by vapor lift action when the switch 162 is open and electrical energy -is being supplied only to one part of the heating element in the electrical circuit which includes conductors 167 and 172.
  • a refrigerator having a cabinet provided with thermally insulated wall structure including inner and outer wall members and insulation therebetween, said inner wall member forming an innerliner of a storage space
  • refrigeration apparatus of the absorption type having v'a gas circuit comprising an evaporator element including conduit means in which refrigerant evaporates in the presence of an inert gas to produce a cooling effect, said conduit means between spaced apart regions in the lengthwise direction thereof having a horizontally extending section which is disposed outside the storage space and completely enveloped in the insulation of said wall structure and out of physical contact with the inner and outer wall members thereof, said inner liner or wall member being apertured, heat transfer means for transmitting cooling effect produced within said conduit section to matter in the storage space solely through a metallic heat iow path, said heat transfer means comprising a metallic member disposed within the storage space and metallic means heat conductively connected thereto which includes a part extending from the storage space through the apertured liner into said insulated wall structure, the section of said conduit means between the spaced apart regions thereof
  • said gas circuit includes another evaporator element in which refrigerant evaporates in the presence of the inert gas to produce a cooling effect, said other evaporator element being disposed in the storage space, said metallic member having a relatively extensive heat transfer surface and serving to transfer cooling effect to a region of the storage space which is removed from 4and above said other evaporator element.
  • refrigeration apparatus of the absorption type which includes a gas circuit comprising a first evaporator element having conduit means in which refrigerant evaporates in the presence of an inert gas to produce a cooling effect, said conduit means between spaced apart regions thereof having a section which is disposed outside the storage space and completely enveloped in the insulation of said wall structure and out of physical contact with the inner and outer wall members thereof, said inner liner or wall member being apertured, heat transfer vmeans for transmitting cooling effect produced within said conduit section to matter in the storage space solely through a metallic heat flow path, said heat transfer means comprising a metallic member disposed within the storage space and metallic means heat conductively connected thereto which includes a part extending from the storage -space through the apertured liner into said insuilated wall structure, the section of said conduit means between the spaced apart regions thereof being thermally connected
  • a refrigerator having Ia lcabinet provided with thermally insulated wall structure including inner and 'outer wall members and insulation therebetween, said inner wall member forming an inner liner of ⁇ a storage space
  • refrigeration apparatus of the absorption type which includes a gas circuit comprising a rst evaporator ⁇ element having conduit means in which refrigerant evaporates in the presence of an inert gas to produce a cooling effect, said conduit means between spaced apart regions thereof having a section which is disposed outside the storage space and completely enveloped in the insulation of said wall structure and out of physical contact with the inner and outer wall members thereof, said inner lliner yor wall member being apertured, heat transfer means for transmitting cooling effect produced within said conduit section to matter in the storage space solely through a metallic heat flow path, said heat transfer means comprising Ia metallic member disposed within the storage sp'ace .and metallic means heat yconductively connected thereto which includes a part extending from the storage space through the apertured liner into said
  • said iirst evaporator element being operable vat a 'lovv temperature and said second evaporator element being operable at a higher tempera-ture, said second evaporator element being arranged to-transfer cooling effect to the bottom part of said freezing compartment, and said metallic member having ⁇ a relatively extensive heat transfer surface and serving to transfer -cooling effe-ct to the upper part of said freezing compartment.
  • Cooling structure providing a place of cooling, absorption refrigeration apparatus including an evaporator element and a vapor expulsion unit, means for heating said unit to supply liquid refrigerant to said evaporator element at a normal rate, said evaporator element including conduit means in which refrigerant evaporates to produce a cooling effect, said conduit means between spaced apart regions in the lengthwise direction thereof having a section positioned in a second place out of direct thermal exchange relation with the place of cooling, heat transfer means for transferring cooling effect produced within said conduit section to matter in the place of cooling solely through a metallic heat ow path, said heat transfer means comprising a metallic member disposed within the place of cooling, said metallic member including a part which extends to said second place and is thermally connected to said conduit section, means responsive to temperature for controlling said heating means, said last-mentioned means including provisions for modifying the heating of said unit by said heating means to reduce the supply of liquid refrigerant to said evaporator element from the normal rate and for heating said unit by said heating means to continue
  • said means responsive to temperature includes provisions for moditying the rate at which said unit is heated by said heating means, when said place of cooling reaches a desired low temperature, to reduce the supply of liquid refrigerant to said evaporator element from the normal rate and for heating said unit by said heating means to continue supplying liquid refrigerant to said evaporator element at a rate less than the normal rate to render said conduit section of said evaporator element operable to produce cooling effect and said metallic member operable to transfer cooling effect to said place of cooling'even when the latter is at the desired low temperature.
  • said absorption refrigeration apparatus includes a gas circuit having said evaporator element and another evaporator element in said place of cooling, and means for initially ilowing liquid refrigerant to said evaporator lelement and from the latter to said other evaporator element for tloW therethrough, said control means being responsive to 11.
  • Cooling structure providing a place of cooling
  • absorption refrigeration apparatus including an evaporator anda vaporiexpulsion unit, an absorption'liquid circuitY comprising .said vapor expulsion unit, said circuit having at least two vertically extending'conduits through which liquid is raised from one level to a higher level, means for heating said unit to supply liquid refrigerant to said evaporator at a normal rate, said evaporator being positioned in a second place which is out of direct thermal exchange relation With said place of cooling, a metallic member positioned in said place of cooling for transferring cooling edect therein, said member including a part which extends to said second place and is heat conductively connected to Vsaid evaporator, means responsive to temperature for controlling said heating means, said last-mentioned means including provisions for modifying the rate at which said unit is heated by said heating means, when said place of cooling reaches a desired low temperature, to reduce the supply of liquid refrigerant to said evaporator from the normalrate and for heating said unit by said heating means to supply liquid refrigerant
  • Cooling structure as set forth in claim 11 in which said vertically extending conduits form vapor-lift tubes in which liquid is raised by vapor-lift action, said tube having the larger internal cross-sectional area being effective to raise liquid by vapor-lift action only when said unit is heated by said heating means to supply liquid refrigerant to said evaporator at the normal rate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US456920A 1953-11-28 1954-09-20 Cooling unit for absorption refrigeration apparatus Expired - Lifetime US2794331A (en)

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US (1) US2794331A (de)
CH (1) CH336085A (de)
DE (1) DE948690C (de)
FR (1) FR1108516A (de)
GB (1) GB752762A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2964921A (en) * 1957-03-15 1960-12-20 Kirk Ind Inc Absorption refrigerating system
US3137147A (en) * 1960-01-30 1964-06-16 Aktieholaget Electrolux Absorption refrigerator
US3170310A (en) * 1960-09-24 1965-02-23 Electrolux Ab Heat operated absorption refrigerator
US3338062A (en) * 1964-12-11 1967-08-29 Electrolux Ab Absorption refrigeration system of the inert gas type
US3338066A (en) * 1964-12-23 1967-08-29 Electrolux Ab Absorption refrigeration
US20120227323A1 (en) * 2009-07-17 2012-09-13 Whirlpool Corporation Method of making an appliance door
CN116558144A (zh) * 2023-06-28 2023-08-08 荏原冷热系统（中国）有限公司 一种溴化锂吸收式制冷机蒸发器防冻管判断方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2449523A (en) * 2007-05-22 2008-11-26 4Energy Ltd Absorption refrigerator system comprising a condenser pipe surrounded by a tapered fluid filled enclosure

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US1823456A (en) * 1929-06-10 1931-09-15 Electrolux Servel Corp Refrigeration
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US3137147A (en) * 1960-01-30 1964-06-16 Aktieholaget Electrolux Absorption refrigerator
US3170310A (en) * 1960-09-24 1965-02-23 Electrolux Ab Heat operated absorption refrigerator
US3338062A (en) * 1964-12-11 1967-08-29 Electrolux Ab Absorption refrigeration system of the inert gas type
US3338066A (en) * 1964-12-23 1967-08-29 Electrolux Ab Absorption refrigeration
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Also Published As

Publication number Publication date
GB752762A (en) 1956-07-11
FR1108516A (fr) 1956-01-13
DE948690C (de) 1956-09-06
CH336085A (de) 1959-02-15

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