EP4265985A1 - Appareil frigorifique ménager pourvu de deux évaporateurs - Google Patents

Appareil frigorifique ménager pourvu de deux évaporateurs Download PDF

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Publication number
EP4265985A1
EP4265985A1 EP23165452.6A EP23165452A EP4265985A1 EP 4265985 A1 EP4265985 A1 EP 4265985A1 EP 23165452 A EP23165452 A EP 23165452A EP 4265985 A1 EP4265985 A1 EP 4265985A1
Authority
EP
European Patent Office
Prior art keywords
evaporator
storage area
refrigerant
pipe
household refrigeration
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.)
Granted
Application number
EP23165452.6A
Other languages
German (de)
English (en)
Other versions
EP4265985B1 (fr
Inventor
Hans Ihle
Benjamin Schmidt
Stefan Holzer
Thomas Bischofberger
Bernd Schlögel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP4265985A1 publication Critical patent/EP4265985A1/fr
Application granted granted Critical
Publication of EP4265985B1 publication Critical patent/EP4265985B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F25B39/022—Evaporators with plate-like or laminated elements
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series

Definitions

  • the present invention relates to a household refrigeration appliance with a first storage area with a first target temperature and a second storage area with a second target temperature that is lower than the first target temperature, and with a refrigerant circuit that has a first evaporator for cooling the first storage area and comprises a second evaporator for cooling the second storage area, the second evaporator being connected in series after the first evaporator in the refrigerant circuit.
  • the object of the present invention is to create a household refrigeration device with two storage areas and evaporators assigned to the storage areas, the second evaporator being assigned to the compartment with a lower target temperature than the first compartment, and being connected in series to the first evaporator in a refrigerant circuit , in which the higher temperature storage area has improved temperature stratification and the evaporator requires little effort.
  • the task is solved by a household refrigeration device and according to claim 1.
  • the invention relates to a household refrigeration device with a first storage area with a first target temperature and a second storage area with a second target temperature that is lower than the first target temperature, a refrigerant circuit which has a first evaporator for cooling the first storage area and a second evaporator for cooling the second storage area, wherein the second evaporator is connected downstream of the first evaporator in the refrigerant circuit in the flow direction of the refrigerant.
  • Each evaporator has a refrigerant-side surface for heat exchange with refrigerant circulating in the refrigerant circuit and an air-side surface for heat exchange with the storage area assigned to the evaporator.
  • the ratio of the refrigerant-side surface to the air-side surface of the first evaporator is in the range 0.12 to 0.25.
  • the first evaporator is a plate evaporator on a rear wall of the first storage area and has a refrigerant pipe with a pipe cross section smaller than 18 mm 2 on.
  • the first storage area has an upper partial storage area in which the household refrigerator is not equipped with bearing shells, the air-side surface of the first evaporator being less than 75% of the area available on the rear wall of the upper partial storage area.
  • Such a household refrigeration device is in particular a household refrigeration device in which normal household quantities of food are stored in different compartments at different temperatures and possibly undergo temperature treatment. With evaporators that operate at different temperatures, storage compartments can be maintained or operated at different temperatures.
  • the refrigerant-side surface is the inner surface of the refrigerant pipe and can be determined from the inner diameter and length of the pipe on the evaporator plate if the pipe cross-section is round.
  • the air-side surface is the surface of the evaporator plate.
  • the pipe cross-section smaller than 18 mm 2 is the cross-sectional area enclosed by the pipe wall through which refrigerant flows. This cross-sectional area is smaller than the usual cross-sectional area of the refrigerant pipes of today's household refrigeration devices.
  • the air-side surface of the evaporator is less than 75%, preferably less than 65%, more preferably less than 55%, of the area available on the rear wall of the upper partial storage area.
  • the household refrigeration appliance can be equipped with bearing shells in a lower partial storage area of the first storage area.
  • Such storage trays can be intended for storing vegetables or as a cold storage area.
  • Such bearing shells belong to the first storage area in terms of storage temperature, but can have their own target temperatures that deviate from an average target temperature of the first storage area by a few °C.
  • these optional bearing shells are not cooled by an evaporator, which is arranged in the rear wall directly behind the shells, but by the first evaporator via a suitable air duct.
  • a width of the first evaporator is less than 80% of a width of the first storage area.
  • a desired temperature distribution can be achieved with a sufficient height of the evaporator; by using the area reduction through an evaporator that is narrower than the rear wall.
  • a longer refrigerant tube than usual is required in order to meet the ratio of refrigerant-side surface to air-side surface in the first evaporator.
  • This increased pipe length is used to cool areas of the evaporator plate differently by covering the evaporator plate with pipe loops.
  • a top side of the evaporator borders a ceiling of the first storage area.
  • the ceiling includes a possible curve in an edge between the back wall and the ceiling. In this way, the warmest region of the first storage area under natural convection can be intensively cooled.
  • the injection point is preferably arranged to the side of the evaporator with the advantage of a well-cooled top corner of the evaporator.
  • the plate evaporator preferably has an injection point near an upper edge. This means that the flow of the refrigerant is supported by gravity.
  • the injection area is preferably inclined in order to impart a clear direction via gravity to the refrigerant flow, which is very slow at this point.
  • the entire pipe run is designed to slope from the injection point of the upstream evaporator to the beginning of the downstream evaporator in order to avoid unintentional refrigerant accumulation in any pipe areas.
  • a pipe guide of the first evaporator is implemented more densely in a zone in the flow direction shortly after the injection point than in the pipe sections underneath.
  • the pipe routing of the plate evaporator below the zone is advantageously implemented less densely.
  • the pipe routing of the plate evaporator is implemented below the zone with constantly decreasing horizontal width of pipe meanders.
  • the plate evaporator has a constant downward pipe inclination in the flow direction of the refrigerant. This means that the flow of the refrigerant is supported by gravity.
  • the plate evaporator has a constant downward pipe inclination in the flow direction of the refrigerant.
  • the pipe inclination is preferably greater than 2°.
  • the plate evaporator is preferably a roll-bond evaporator, a tube-on-sheet (TOS) evaporator, or a tube-on-foil (TOF) evaporator.
  • TOS tube-on-sheet
  • TOF tube-on-foil
  • a bearing shell can be arranged below the first storage area, with a lower edge of the plate evaporator being arranged at least 50 mm above an upper edge of the bearing shell.
  • the lower edge of the plate evaporator is arranged at most 200 mm above an upper edge of the bearing shell.
  • a preferred embodiment of the invention is a household refrigerator as a refrigerator-freezer combination with a cold storage area and a freezer storage area.
  • the first evaporator in the refrigerant circuit in the direction of flow is assigned to the cold storage area and the second evaporator in series is assigned to the freezer storage area.
  • a preferred embodiment of the refrigerator-freezer combination is a so-called bottom freezer with a cold storage area at the top and a freezer storage area below.
  • the connection between the evaporators can preferably be made with a constant gradient, so that no accumulation of refrigerant takes place between the evaporators.
  • An evaporator tube layout can be chosen so that the end of the tube on the refrigerator compartment evaporator is placed on the opposite side to the connecting tube. The free laying of the pipe enables length compensation, which is helpful for assembly in production.
  • a first variant of such a refrigeration device contains the first and second evaporators in series without a refrigerant pipe opening in between.
  • This embodiment describes a refrigeration device in which both evaporators are always operated at the same time and the same amount of refrigerant flows through it. This design avoids branches and requires fewer valves in the refrigerant circuit.
  • the warmer of the storage areas can be provided and controlled with a temperature sensor.
  • the refrigeration device is then usually designed in such a way that the target temperature of the colder compartment is usually slightly below.
  • the invention improves the filling of the downstream evaporator with liquid refrigerant in this refrigeration device, especially after a compressor has started up. Since both evaporators are operated at the same time and thus an energetically advantageous utilization of the entire heat exchanger surfaces is achieved, very efficient operation of the device is achieved.
  • a second variant of such a refrigeration device contains the first and second evaporators in series with an opening of a refrigerant pipe between them.
  • This embodiment describes a refrigeration device in which both evaporators are always operated simultaneously in a first circuit and the same amount of refrigerant flows through them. In a second circuit, only the downstream evaporator is operated.
  • both storage areas each equipped with a temperature sensor
  • both evaporators are operated in series, but occasionally the evaporator in the colder storage area can be operated alone in order to precisely maintain its target temperature. This means that further improved energy efficiency can be achieved, as the colder compartment is always operated at its target temperature.
  • fans in one or both storage areas or on one or both evaporators can be used to change the coordination of the storage areas with regard to their target temperatures to a small extent.
  • a further embodiment of the first variant of the refrigeration device has a fan on the evaporator of the upstream compartment, and a control that lowers its fan speed at low ambient temperatures and/or increases its fan speed at high ambient temperatures.
  • Another embodiment of the first variant of the refrigeration device has a fan on the evaporator of the downstream compartment and a controller that controls the fan speed. This expands a control range in which the target temperatures of both storage areas can be maintained simultaneously in serial operation of the evaporators.
  • the household refrigeration appliance can have a lower partial storage area with bearing shells in the first storage area.
  • the lower storage area including the shells is cooled by the first evaporator in the upper partial storage area.
  • the household refrigerator can advantageously be designed in such a way that a cold air flow is created on the rear wall in front of the evaporator, which flows along the rear wall to the storage shells.
  • a household refrigeration appliance 10 is shown as a refrigerator and freezer combination, the heat-insulating housing 11 of which has two first and second storage areas 15, 16 which are thermally separated from one another by a heat-insulating partition 12 and are arranged vertically one above the other and can be closed with separate doors 13 and 14.
  • the higher-lying first storage area 15, which can be closed with the door 13, is designed as a refrigerator compartment, which is equipped with tiers 17 arranged vertically one above the other and used to store refrigerated goods.
  • the other second storage area 16 which is arranged below the refrigerator compartment and is separated from it by the heat-insulating partition 12, is designed as a freezer compartment, which has frozen food containers 18 that can be pulled out like drawers to accommodate frozen goods.
  • Both the refrigerator compartment and the freezer compartment are equipped with evaporators to maintain their intended storage area temperature, of which the evaporator 20 of the first storage area 15 is indicated as a plate evaporator on a rear wall 19 of the first storage area 15.
  • the evaporators are integrated into a refrigeration circuit, not shown, within which a compressor supplying the evaporators with liquid refrigerant is arranged.
  • the first storage area 15 has an upper partial storage area 28, in which the household refrigerator 10 is not equipped with bearing shells, and a lower partial storage area 29, in which bearing shells 21 are arranged.
  • the bearing shells 21 are closed by a cover 22.
  • the distance 23 from the cover 22 to the lower edge of the evaporator 20 is between 50 and 200 mm.
  • the width 24 of the evaporator 20 is less than 80% of the width 25 of the rear wall 19 of the first storage area 15.
  • the evaporator plate 27 of the first evaporator 20 faces the first storage area with its air-side surface in order to cool the air of the first storage area.
  • the air-side surface of the evaporator plate 27 or the first evaporator 20 is less than 60% of the area of the rear wall 19 of the first storage area 15.
  • Fig. 2 shows an arrangement of first evaporators 20 ' and second evaporator 30 of the household refrigerator 10 Fig. 1 .
  • the first evaporator 20' is designed as a tube-on-sheet (TOS) evaporator with a refrigerant tube 31 on an evaporator plate 27'.
  • the evaporator plate 20' is arranged on a rear wall 19' of the first storage area 15, the width 24' of the evaporator plate 27' being less than 80% of the width 25' of the rear wall 19'.
  • the evaporator 20' can be arranged behind a wall of an inner container with the refrigerant pipe on the side facing away from the inner container.
  • An injection point 34 is arranged laterally outside the upper right corner of the evaporator plate 27 '.
  • the refrigerant pipe 31 protrudes beyond the evaporator plate at the upper right corner of the evaporator plate 27 '.
  • the pipe routing on the evaporator plate is implemented more densely in a zone 33 shortly after an injection point 34 than in the subsequent pipe sections.
  • a constant downward inclination of the refrigerant pipe 31 is maintained in order to avoid accumulation of refrigerant due to gravity in this pipe section.
  • the constantly falling pipe run design generally avoids the nesting of pipe meanders. This results in a relatively simple pipe route in terms of production.
  • the evaporator outlet 36 is connected by a connecting section 37 to the second evaporator 30, which runs with a constant inclination.
  • the refrigerant pipe 31 can have a different diameter in the section on the evaporator plate 27 'than in the connecting section 37.
  • the evaporator 30 can be a finned evaporator or a coil evaporator.
  • a first capillary 38 runs in an insulating material to the injection point 34.
  • FIG. 2 an optional second capillary 39 is shown, which opens into the refrigerant pipe 31 at the junction 32 and forms an injection point 40 in the refrigerant pipe 31 at the inlet of the second evaporator 30.
  • the optional second capillary 39 enables a two-circuit refrigeration device with a so-called intermediate injection of refrigerant into the downstream evaporator.
  • Fig. 3 shows a further embodiment of the first evaporator 20" with several independent changes compared to the first evaporator 20' Fig. 2 .
  • the injection point 34' of the refrigerant pipe 31' is now no longer on the side, but above the evaporator plate 27".
  • the first evaporator 20" has an evaporator plate 27" which tapers downwards.

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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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP23165452.6A 2022-04-20 2023-03-30 Appareil frigorifique ménager pourvu de deux évaporateurs Active EP4265985B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022203876.2A DE102022203876A1 (de) 2022-04-20 2022-04-20 Haushaltskältegerät mit zwei Verdampfern

Publications (2)

Publication Number Publication Date
EP4265985A1 true EP4265985A1 (fr) 2023-10-25
EP4265985B1 EP4265985B1 (fr) 2025-12-31

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Application Number Title Priority Date Filing Date
EP23165452.6A Active EP4265985B1 (fr) 2022-04-20 2023-03-30 Appareil frigorifique ménager pourvu de deux évaporateurs

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EP (1) EP4265985B1 (fr)
DE (1) DE102022203876A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1751070A1 (de) * 1968-03-28 1970-09-17 Bauknecht Gmbh G Verfahren zum Kuehlen und Abtauen eines Normalkuehlfaches und Kuehlmoebel zur Durchfuehrung des Verfahrens
JP2009074769A (ja) * 2007-09-21 2009-04-09 Toshiba Corp 冷蔵庫
CN102519201A (zh) * 2011-12-24 2012-06-27 广东奥马电器股份有限公司 带有高效节能蒸发器的冷藏箱
DE102016224434A1 (de) 2016-12-08 2018-06-14 BSH Hausgeräte GmbH Kältegerät mit mehreren Temperaturzonen
EP3599434A1 (fr) * 2018-07-23 2020-01-29 BSH Hausgeräte GmbH Appareil de refroidissement à circuit unique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1751070A1 (de) * 1968-03-28 1970-09-17 Bauknecht Gmbh G Verfahren zum Kuehlen und Abtauen eines Normalkuehlfaches und Kuehlmoebel zur Durchfuehrung des Verfahrens
JP2009074769A (ja) * 2007-09-21 2009-04-09 Toshiba Corp 冷蔵庫
CN102519201A (zh) * 2011-12-24 2012-06-27 广东奥马电器股份有限公司 带有高效节能蒸发器的冷藏箱
DE102016224434A1 (de) 2016-12-08 2018-06-14 BSH Hausgeräte GmbH Kältegerät mit mehreren Temperaturzonen
EP3599434A1 (fr) * 2018-07-23 2020-01-29 BSH Hausgeräte GmbH Appareil de refroidissement à circuit unique

Also Published As

Publication number Publication date
DE102022203876A1 (de) 2023-10-26
EP4265985B1 (fr) 2025-12-31

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