US20220404071A1 - Refrigeration appliance with compartments that can be heated and cooled - Google Patents

Refrigeration appliance with compartments that can be heated and cooled Download PDF

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Publication number
US20220404071A1
US20220404071A1 US17/639,134 US202017639134A US2022404071A1 US 20220404071 A1 US20220404071 A1 US 20220404071A1 US 202017639134 A US202017639134 A US 202017639134A US 2022404071 A1 US2022404071 A1 US 2022404071A1
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US
United States
Prior art keywords
evaporator
heat exchanger
condenser
operating state
refrigeration appliance
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.)
Pending
Application number
US17/639,134
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English (en)
Inventor
Niels Liengaard
Andreas Babucke
Clemens Mack
Berthold Pflomm
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
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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
Assigned to BSH HAUSGERAETE GMBH reassignment BSH HAUSGERAETE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BABUCKE, Andreas, LIENGAARD, NIELS, Mack, Clemens, PFLOMM, BERTHOLD
Publication of US20220404071A1 publication Critical patent/US20220404071A1/en
Pending legal-status Critical Current

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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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/054—Compression system with heat exchange between particular parts of the system between the suction tube of the compressor and another part of the cycle
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2511—Evaporator distribution valves
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/16—Convertible refrigerators

Definitions

  • the following invention relates to a refrigeration appliance, in particular a household refrigeration appliance, with at least one compartment which can be kept at an operating temperature below or above the ambient temperature according to a user's choice, in order to cool food, for example, or keep it warm for imminent consumption.
  • This variability of the operating temperature is achieved in a known refrigeration appliance of the applicant by a condenser, a first controllable choke point, a heat exchanger of the variable compartment, a second controllable choke point and a first evaporator of a cooled compartment being connected in series in a refrigerant circuit between an outlet of a compressor.
  • the pressure drop at the first controllable choke point high, meaning that condensation only takes place in the condenser and the heat exchanger of the variable compartment also works as an evaporator; during heating operation, the pressure drop substantially takes place at the second choke point, meaning that refrigerant also condenses in the heat exchanger and in doing so releases heat.
  • the condenser undergoes forced ventilation, and the power of a fan of the condenser may be reduced compared to cooling operation, in order to control the amount of refrigerant vapor that reaches the heat exchanger, and therefore to control the heating power of the heat exchanger.
  • Liquid refrigerant that accrues in the condenser during the heating operation should be kept away from the heat exchanger; for this reason, the conventional refrigeration appliance provides a branching point designed as a separator downstream of the condenser, which separates off the liquid refrigerant in order to use it in a second evaporator arranged in parallel with the heat exchanger.
  • a line which supplies the liquid refrigerant to the second evaporator, together with a suction line, which leads from an outlet of the first evaporator to an inlet of the compressor, forms an internal heat exchanger in which the liquid refrigerant in thermal contact with the drawn-in refrigerant vapor cools down.
  • the mass flow rate of the liquid refrigerant is too low, then it may occur that the temperature of the liquid refrigerant lies below its evaporation temperature when reaching the second evaporator and no evaporation takes place at least in part of the second evaporator; in addition, the temperature of the refrigerant vapor when reaching the compressor may still be so low that water vapor condenses on the suction line, which not only impairs the efficiency of the refrigeration, but also may lead to electrical problems and corrosion.
  • a refrigeration appliance in particular household refrigeration appliance, with a compressor, a condenser, at least a first evaporator, a suction line running from the first evaporator to the compressor, at least one heat exchanger that can be switched between condenser and evaporator operation and with a valve arrangement for switching the heat exchanger between an evaporator operating state, in which an inlet of the switchable heat exchanger is connected to the condenser via a first choke point and an outlet of the switchable heat exchanger is connected to the evaporator, and a condenser operating state, in which the outlet of the switchable heat exchanger is connected to the evaporator via a second choke point, the switchable heat exchanger is assigned a first supply line for the supply of refrigerant in the evaporator operating state and a second supply line, which is separate from the first supply line, for the supply of refrigerant in the condenser operating state, and that only the first supply line is
  • a precooling of the refrigerant reaching the switchable heat exchanger by way of the internal heat exchanger can thus remain restricted to the case of the evaporator operating state, while in the case of the condenser operating state a liquefaction of the refrigerant remains excluded before reaching the switchable heat exchanger.
  • a controlled expansion valve is preferably provided as a second choke point between the two.
  • the switchable evaporator In order to avoid a loss of heating power that can be used at the switchable evaporator by way of heat emission via the condenser, it is possible for the switchable evaporator to be connected in parallel with the condenser in the condenser operating state. Thus, refrigerant can be supplied to the switchable evaporator immediately after leaving the compressor, without having the opportunity to emit heat via the condenser.
  • a frame heater may be connected upstream of the condenser and the switchable heat exchanger together, or it may be arranged in series with the condenser, in parallel with the switchable heat exchanger.
  • a shut-off valve should be provided at the first supply line in order to enable a blocking of the first supply line in the condenser operating state.
  • the refrigeration appliance comprises at least two switchable heat exchangers, which can be switched between evaporator operating state and condenser operating state independently of one another. If these are assigned to compartments of the refrigeration appliance with different sizes in each case, a user can choose between various volumes of the region that can be used in the condenser operating state.
  • the volume of one of these compartments amounts to between 150% and 250% of the volume of the other.
  • the valve arrangement may comprise a directional valve, which in the evaporator operating state is closed and in the condenser operating state of at least one of the switchable heat exchangers connects the inlet of the heat exchanger in question to an outlet of the compressor, at least for a time.
  • valve arrangement can be switched in a clocked manner between a first open position, in which it connects an outlet of the compressor to the inlet of the first heat exchanger, and a second open position, in which it connects the outlet of the compressor to the inlet of the second heat exchanger.
  • a clocked switching is understood here to mean a periodic switching, wherein the period is short enough to enable condensation in both switchable heat exchangers at the same time.
  • a second evaporator may be connected in series upstream of the first evaporator and connected in parallel with the at least one switchable heat exchanger, in order to be able to cool another compartment at the same time as the operation of the at least one switchable heat exchanger in the condenser operating state.
  • the temperature of the second evaporator may be set higher than that of the first, in order to keep the compartments of the two evaporators at different operating temperatures.
  • a normal refrigeration compartment and a freezer compartment can be implemented; other combinations are of course also possible, such as a normal refrigeration compartment and cold storage compartment or cold storage compartment and freezer compartment.
  • a connection line between the first evaporator and the second evaporator may be connected to the suction pipe to form a section of the internal heat exchanger, in particular this section may connect immediately to an outlet of the first evaporator, in order to cause a first heating of the refrigerant vapor circulating in the suction line, before it reaches a second section of the internal heat exchanger, in which the heat exchange with the first supply line takes place.
  • the third choke point also preferably comprises a controlled expansion valve.
  • FIG. 1 shows a block diagram of a refrigeration appliance according to the invention.
  • the refrigeration appliance in FIG. 1 comprises a cold cooled compartment 1 , typically a freezer compartment, a warm cooled compartment 2 , typically a normal refrigeration compartment, as well as a first and a second flexible, i.e., optionally coolable and heatable, compartment 3 , 4 .
  • a refrigerant line 7 which starts from an outlet 5 of a compressor 6 , first reaches a frame heater 9 and a condenser 10 via a branching point 8 .
  • a fan 26 may be assigned to the condenser 10 in order to control its power.
  • the refrigerant line 7 branches off into three branches 12 a - c .
  • each branch 12 a - c the following follow one another: a valve 13 a - c , a supply line 14 a - c , which may be embodied as a capillary, a heat exchanger 15 a, b or an evaporator 15 c and a controlled expansion valve 16 a - c .
  • the heat exchangers 15 a, b are each in thermal contact with one of the compartments 3 , 4 ; the evaporator 15 c is in contact with the compartment 2 .
  • the heat exchangers 15 a, b and the evaporator 15 c are embodied as finned heat exchangers of a per se known construction, in which in each case a large number of mutually parallel fins are merged to form a block, the refrigerant line 7 crosses the fins in a meandering manner and air circulates in the intermediate spaces between the fins, and each finned heat exchanger is assigned a fan 17 a - c , which controls the intensity of the air circulation and therefore the thermal power exchanged with the compartment 2 , 3 or 4 assigned in each case.
  • the three branches 12 a - c merge at a junction 18 .
  • the junction 18 may lie upstream of an evaporator 19 that cools the compartment 1 ; preferably, it is located in the evaporator 19 itself, i.e., the evaporator 19 possesses an inlet for each branch 12 a - c .
  • the evaporator 19 is also assigned a fan 27 .
  • a suction line 20 runs to an inlet 21 of the compressor 6 .
  • the suction line 20 together with a connection line 22 of the branch 12 c lying downstream of the evaporator 15 c as well as with the supply lines 14 a - c , forms an internal heat exchanger 23 , in which the refrigerant vapor circulating in the suction line 20 is first heated in thermal contact with the connection line 22 and subsequently in thermal contact with the supply lines 14 a - c .
  • the connection line 22 and the supply lines 14 a - c may be fastened to the surface of the suction line 20 or guided in the interior thereof.
  • An inlet of a directional valve 24 is connected to the branching point 8 .
  • the directional valve 24 has an outlet in each case, which is connected to the inlet of the heat exchanger 15 a or 15 b via a supply line 25 a or 25 b in each case, and can be switched between the closed position, a position open toward the heat exchanger 15 a and a position open toward the heat exchanger 15 b.
  • a first operating state In a first operating state, the position open toward the heat exchanger 15 a and the closed position of the directional valve 24 alternate with one another, the valve 13 a is closed, and the expansion valve 16 a is controlled, in order to maintain a high-pressure difference between the heat exchanger 15 a and the evaporator 19 .
  • warm, dense refrigerant from the compressor 6 is applied to the heat exchanger 15 a , and the condensation taking place in the heat exchanger 15 a heats the compartment 3 .
  • the first operating state is a condenser operating state of the heat exchanger 15 a.
  • refrigerant liquefied in the heat exchanger 15 a reaches the evaporator 19 via the expansion valve 16 a , evaporates again at the evaporator 19 and thus cools the compartment 1 .
  • the level of the heating power (or its operating temperature) released in compartment 3 is determined on the one hand by the duty factor of the position of the valve 13 a in which it is open toward the heat exchanger 15 a , and on the other hand by the rotational speed of the fan 17 a ; the slower this runs, the slower the condensation, and the less refrigerant vapor can flow into the heat exchanger 15 a , despite the open valve 13 a , and the more refrigerant vapor therefore has to take the path via the condenser 10 .
  • the mass flow rate via the compressor 10 is therefore variable over time, and with it also the pressure drop at the supply lines 14 b , 14 c .
  • the second operating state in which the position open toward the heat exchanger 15 b and the closed position of the directional valve 24 alternate with one another and the valve 13 b is closed, meaning that the compartment 4 is heated and the compartment 3 is cooled, i.e., the second operating state is an evaporator operating state for the heat exchanger 15 a and a condenser operating state for the heat exchanger 15 b.
  • the compartments 3 , 4 have different sizes, thus a user can make the selection between the first and the second operating state on the basis of the space requirement of the item to be kept warm. This means that the volume of the compartment 3 may amount to between 150 and 250% of the volume of the compartment 4 , or vice versa.
  • both heat exchangers 15 a , 15 b are in the condenser operating state.
  • both valves 13 a , 13 b are closed, no heat exchange takes place via the supply lines 14 a , 14 b in the internal heat exchanger 23 ; only the flow running via the evaporator 15 c is available for the preheating of the drawn-in refrigerant.
  • the directional valve 24 In a fourth operating state, the directional valve 24 is permanently in the closed position.
  • the valves 13 a , 13 b are open, the heat exchangers 15 a , 15 b are in the evaporator operating state and cool the compartments 3 , 4 .
  • Refrigerant on the way to the heat exchangers 15 a , 15 b runs through the supply lines 14 a , 14 b and thus also the internal heat exchanger 23 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US17/639,134 2019-09-02 2020-08-19 Refrigeration appliance with compartments that can be heated and cooled Pending US20220404071A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019213220.0 2019-09-02
DE102019213220.0A DE102019213220A1 (de) 2019-09-02 2019-09-02 Kältegerät mit heiz- und kühlbaren Fächern
PCT/EP2020/073179 WO2021043573A1 (de) 2019-09-02 2020-08-19 Kältegerät mit heiz- und kühlbaren fächern

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US20220404071A1 true US20220404071A1 (en) 2022-12-22

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Application Number Title Priority Date Filing Date
US17/639,134 Pending US20220404071A1 (en) 2019-09-02 2020-08-19 Refrigeration appliance with compartments that can be heated and cooled

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US (1) US20220404071A1 (de)
EP (1) EP4025847A1 (de)
CN (1) CN114286918A (de)
DE (1) DE102019213220A1 (de)
WO (1) WO2021043573A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4151722A (en) * 1975-08-04 1979-05-01 Emhart Industries, Inc. Automatic defrost control for refrigeration systems
US5477915A (en) * 1993-02-25 1995-12-26 Samsung Electronics Co., Ltd. Refrigerator capable of changing functions for compartments and a control method therefor, in particular for fermentation of Kimchi
US20190032985A1 (en) * 2016-02-19 2019-01-31 BSH Hausgeräte GmbH Refrigeration device comprising multiple storage chambers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008044130A1 (de) * 2008-11-27 2010-06-02 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit mehreren Lagerfächern
CN101520249A (zh) * 2009-03-27 2009-09-02 上海双鹿电器有限公司 一种用于具有制冷制热转换间室的冰箱的制冷回路
DE102012222240A1 (de) * 2012-12-04 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Mehrzonen-Kältegerät
DE102015207838A1 (de) * 2015-02-04 2016-08-04 BSH Hausgeräte GmbH Kombinationskältegerät und Betriebsverfahren dafür
DE102015216933A1 (de) * 2015-09-03 2017-03-09 BSH Hausgeräte GmbH Kältegerät mit mehreren Lagerkammern
DE102016209539A1 (de) * 2016-06-01 2017-12-07 BSH Hausgeräte GmbH Kältegerät mit Schnellkühlfunktion und Betriebsverfahren dafür

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4151722A (en) * 1975-08-04 1979-05-01 Emhart Industries, Inc. Automatic defrost control for refrigeration systems
US5477915A (en) * 1993-02-25 1995-12-26 Samsung Electronics Co., Ltd. Refrigerator capable of changing functions for compartments and a control method therefor, in particular for fermentation of Kimchi
US20190032985A1 (en) * 2016-02-19 2019-01-31 BSH Hausgeräte GmbH Refrigeration device comprising multiple storage chambers

Also Published As

Publication number Publication date
CN114286918A (zh) 2022-04-05
EP4025847A1 (de) 2022-07-13
WO2021043573A1 (de) 2021-03-11
DE102019213220A1 (de) 2021-03-04

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