US20190249915A1 - Refrigerator having a drying function, and operating method therefor - Google Patents

Refrigerator having a drying function, and operating method therefor Download PDF

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Publication number
US20190249915A1
US20190249915A1 US16/342,034 US201716342034A US2019249915A1 US 20190249915 A1 US20190249915 A1 US 20190249915A1 US 201716342034 A US201716342034 A US 201716342034A US 2019249915 A1 US2019249915 A1 US 2019249915A1
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US
United States
Prior art keywords
heat exchanger
storage compartment
control unit
refrigerator
drying
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.)
Abandoned
Application number
US16/342,034
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English (en)
Inventor
Andreas Babucke
Niels Liengaard
Matthias Mrzyglod
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
Assigned to BSH HAUSGERAETE GMBH reassignment BSH HAUSGERAETE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MRZYGLOD, MATTHIAS, BABUCKE, Andreas, LIENGAARD, NIELS
Publication of US20190249915A1 publication Critical patent/US20190249915A1/en
Abandoned 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • 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
    • F25D23/00—General constructional features
    • F25D23/02—Doors; Covers
    • F25D23/04—Doors; Covers with special compartments, e.g. butter conditioners
    • 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
    • F25D23/00—General constructional features
    • F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • 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
    • F25D31/005—Combined cooling and heating devices
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
    • F25D2317/04111—Control means therefor

Definitions

  • the present invention relates to a refrigerator having a drying function, i.e. a refrigerator which is able to dry stored material, in particular food, rapidly and effectively and a method for drying material in the refrigerator.
  • a heating unit is provided in an evaporator chamber in order to defrost the evaporator. This heating unit is only in operation if the evaporator is not cooling at the same time and if a fan, which in normal cooling mode circulates air between the evaporator chamber and the storage compartment, is also switched off.
  • a refrigerator in which a heating unit is arranged in a storage compartment in order to dry the contents of the storage compartment is disclosed in JP 2008032392.
  • the efficiency of this drying is limited.
  • nothing is disclosed about the positioning of the heating unit in the storage compartment but it is assumed from the drawing that it is located on the floor of the storage compartment. If the compartment is completely filled up, the result of this is that the heat initially has to spread through the dry goods to the surface thereof so that it may assist with the evaporation there; at the same time heat is lost in the downward direction. Attaching the heating unit above the dry goods is also unsatisfactory since then the cold air blown into the compartment separates the heating unit and the dry goods from one another.
  • the object is firstly achieved by the control unit assisting a drying operating mode in which the fan operates at the same time as the heating unit.
  • the heating unit may not only be used for defrosting the heat exchanger but also by the input of heat into the storage compartment for increasing the evaporation there.
  • control unit is designed to insert a defrosting phase in which the heating unit is in operation without the fan, so that frost condensed out on the heat exchanger is able to defrost and drain away, without an airflow passing thereover being able to convey vapor back to the storage compartment.
  • the control unit is then designed to transfer from the defrosting phase to the heating phase, i.e. set the fan in operation, when the rise of the temperature of the heat exchanger from a negative to a positive value enables it to be deduced that the heat exchanger is completely defrosted.
  • the control unit may be connected to a hygrometer arranged in the storage compartment, in order to decide from the measured data thereof when the material in the storage compartment is sufficiently dry that the drying operating mode may be terminated.
  • control unit may be expediently designed to detect the duration of the defrosting phase and to terminate the drying operating mode if this duration falls below a threshold value.
  • the hygrometer may become superfluous in the storage compartment.
  • This threshold value may be fixedly predetermined, i.e. the same for each drying process. It is more advantageous, however, to fix this value individually in proportion with the quantity of the material to be dried and the drying properties thereof for each drying process. This may be carried out in a simple manner by the duration of the first defrosting phase of a drying process being measured and the threshold value being fixed as a function of this duration, in particular as a predetermined fraction thereof. Thus substantially irrespective of the quantity of the material stored in the storage compartment it may be ensured that during the course of the drying process the water content of the material is reduced corresponding to the fraction.
  • control unit may also be connected to a storage compartment temperature sensor and designed to detect the alteration speed of the temperature of the storage compartment.
  • the alteration speed may be determined as a difference between the temperatures measured in a predetermined time interval; on the other hand, the time required for a predetermined temperature alteration, in particular the duration of a heating phase and/or a cooling phase, may also be measured.
  • the alteration speed provides information about the quantity of material; if this is set in relation to the quantity of water discharged from the material in a cooling phase, this makes it possible to deduce the tendency of the material to discharge water and may be taken into account when fixing a condition for terminating the drying process.
  • the threshold value may be fixed at a lower level for the duration of the defrosting phase, the greater the tendency of the material to discharge water.
  • control unit may also be connected to a user interface and designed to receive therefrom an input from a user about the type of material loaded into the storage compartment.
  • the control unit may also be connected to a set of scales which is arranged in the storage compartment in order to weigh the material loaded into the storage compartment.
  • a set of scales may simplify the drying in different ways. Firstly, the weight of the material may be continuously monitored and the drying process terminated if the weight has reduced to a predetermined fraction of the initial weight of the material. How large this fraction is to be may be established by using the type of material, if known. On the other hand, from the weight and the speed of the weight reduction conclusions may be drawn about the type of material, and a target weight at which the drying process is terminated may be established in a suitable manner.
  • the heat exchanger is able to be switched between operation as an evaporator and operation as a heating unit.
  • the heat exchanger in a refrigerant circuit may be connected in series to at least one throttle point, the throughflow rate thereof being controlled by the control unit.
  • This embodiment permits, in particular, energy-efficient drying when the refrigerator comprises at least one further storage compartment, the heat released during operation of the heat exchanger as a heating unit being able to be discharged therefrom.
  • control unit is further designed to transmit a message about the termination of the drying operating mode to a networked appliance which immediately informs the user thereof about the termination of the drying process by a—preferably acoustic or tactile-signal.
  • a networked appliance which immediately informs the user thereof about the termination of the drying process by a—preferably acoustic or tactile-signal.
  • an explanation which provides information about the termination of the drying process may be retrieved on a screen of the networked appliance.
  • a suitable utility program for receiving the message and generating the signal such as for example an app for a smartphone, may be delivered or provided for download as an accessory for the refrigerator according to the invention.
  • the object is further achieved by a method for drying material in a refrigerator, in particular a refrigerator as described above, having the steps
  • a further solution of the object is a method for drying material in a refrigerator, having the steps
  • the drying may be terminated if at least one of the following parameters has reached a threshold value
  • This threshold value may be fixed using an initial value of at least one of the cited parameters and/or the type of material.
  • FIG. 1 shows a schematic section through a refrigerator according to the invention
  • FIG. 2 shows a refrigerant circuit of the refrigerator
  • FIG. 3 shows a flow diagram of an operating method executed by a control unit of the refrigerator.
  • FIG. 1 shows in a schematic sectional view a part of a housing 1 of a refrigerator.
  • a chamber 2 which is shown in its entirety, one or more chambers 3 which are shown only in a fragmentary manner in the figure may be present.
  • the chamber 2 is subdivided by an intermediate wall 4 into a heat exchanger chamber 5 and a storage compartment 6 .
  • the heat exchanger chamber 5 contains, in a manner known per se, a heat exchanger 7 which may be operated as an evaporator for cooling the storage compartment 6 and a fan 8 for driving an airflow 9 which circulates through the heat exchanger chamber 5 and the storage compartment 6 .
  • the storage compartment 6 is able to be loaded with material 11 to be dried.
  • An electrically operated defrost heater which is known per se, may be mounted on the heat exchanger 7 .
  • the heat exchanger 7 itself is able to be operated optionally as an evaporator or as a condenser discharging heat to the heat exchanger chamber 5 , as is described below in more detail.
  • a collection channel 16 for condensed water draining from the heat exchanger extends on the floor of the heat exchanger chamber 5 below the heat exchanger 7 .
  • a condensed water drain 17 leads from the lowest point of the collection channel 16 through an insulation layer surrounding the chamber 2 to an evaporation tray 18 .
  • the evaporation tray 18 may be arranged in a machine chamber of the refrigerator closely adjacent to a compressor 19 in order to be heated by the waste heat thereof.
  • An electronic control unit 10 is connected to a heat exchanger temperature sensor 12 which is mounted on the heat exchanger 7 and to a storage compartment temperature sensor 13 on a wall of the storage compartment 6 .
  • control unit 10 may be connected to a hygrometer 14 which is arranged on the path of the airflow 9 , preferably at an inlet of the heat exchanger chamber 5 .
  • a set of scales 15 which may be loaded with the material 11 to be dried may optionally be provided in the storage compartment 6 in order to deliver measured values of the weight thereof to the control unit 10 .
  • the set of scales 15 may be a domestic set of scales which may also be operated autonomously outside the refrigerator and which is placed in the storage compartment 6 and connected to the control unit 10 merely for drying the material 11 .
  • FIG. 2 shows a refrigerant circuit according to a preferred embodiment of the refrigerator.
  • a condenser 21 which is exposed on the outside of the body 1 is connected to a refrigerant line 20 starting from a pressure connection of the compressor 19 . Downstream of the condenser the line 20 forks into two branches 22 , 23 .
  • a first controllable throttle point 24 , the heat exchanger 7 and a second controllable throttle point 25 are connected in series on the branch 22
  • a third controllable throttle point 26 , a heat exchanger 27 of one of the chambers 3 and a fourth controllable throttle point 28 are connected in series on the branch 23 .
  • the line 20 extends from a joining point of the two branches 22 , 23 via an evaporator 29 of a further compartment 3 to a suction connection of the compressor 19 .
  • the throttle points 24 , 25 , 26 , 28 may be expansion valves. The flow conductance thereof is able to be adjusted by the control unit 10 .
  • FIG. 3 shows an operating method of the control unit 10 .
  • a drying process starts by a user inputting a corresponding command at a user interface 30 (S 1 ).
  • the control unit 10 initiates a cooling phase S 2 by switching the throttle point 24 to low conductance, the throttle point 25 to high conductance and operates the compressor 19 and the fan 8 .
  • the heat exchanger 7 cools down to a temperature below 0° C. and cold air from the heat exchanger 7 reaches the storage compartment 6 .
  • warm air suctioned from the storage compartment discharges its moisture as frost on the heat exchanger 7 .
  • This state is maintained until the storage compartment temperature sensor 13 indicates that the temperature has fallen below a lower threshold temperature Tmin.
  • the lower threshold temperature Tmin should be selected to be above 0° C.
  • step S 3 a test may be carried out to establish whether conditions for terminating the drying process are fulfilled. These conditions may be different depending on which sensors the refrigerator is provided with, and are described below.
  • the throttle point 24 is switched to high conductance and the throttle point 25 to low conductance.
  • the compressor 19 remains in operation so that the refrigerant condenses in the heat exchanger 7 instead of evaporating.
  • the fan 8 may remain in operation: but preferably it is initially switched off in order to heat the heat exchanger 7 in a defrosting phase S 4 until the heat exchanger temperature sensor 12 displays a positive temperature of the heat exchanger 7 . If this is the case, the frost from the heat exchanger 7 is defrosted and the water is drained out via the condensed water drain 17 . In the following heating phase the fan 8 blows warm air from the heat exchanger 7 into the storage compartment 6 .
  • This upper threshold temperature Tmax may be adjustable on the user interface 30 or fixed to the type of material 11 by the control unit 10 using inputs provided at the user interface 30 ; in order to achieve rapid drying, it should be possible to set an upper threshold temperature Tmax above room temperature, preferably above 40 or even 50° C.
  • step S 2 when the upper threshold temperature Tmax is exceeded the method immediately returns to step S 2 .
  • the test could be carried out to establish whether the conditions for terminating the drying process are fulfilled.
  • the terminating condition may be when the air humidity falls below a threshold value.
  • a threshold value may be predetermined differently according to the type of material 11 to be dried, and stored in a storage device, the control unit 10 retrieving said threshold value using data from the user relative to the material 11 .
  • control unit may terminate the drying process when the weight of the material 11 has reduced to a fraction of the weight at the start of the drying process—preferably predetermined according to the type of material 11 —or when the weight no longer alters during the course of one cycle of the method.
  • the control unit measures the defrosting time which the heat exchanger requires in order to be heated from a predetermined temperature just below 0° C. to a temperature just above 0° C. This time is a measurement of the quantity of frost collected in the previous cooling phase. If it is shorter than a predetermined threshold value then the material 11 may be regarded as dry and the drying process terminated.
  • the quantity of material 11 loaded in the storage compartment 6 should be considered: the greater this quantity of material, the greater the quantity of frost which then condenses on the heat exchanger 7 if the material is already dried to the required extent. This is why according to a second development the control unit also measures the duration of the cooling phase. This is linearly dependent on the quantity of material 11 . Thus, in particular, the quantity of material may be estimated from the duration of the first cooling phase and the threshold value of the defrosting time may be proportionally fixed to this quantity of material.
  • the ratio between the quantity of material estimated using the duration of a cooling phase and the quantity of water estimated using the defrosting time of the subsequent heating phase enables the control unit 10 to identify whether the material 11 which is located in the storage compartment is easy or difficult to dry.
  • the control unit may also set the threshold value of the defrosting time, at which it terminates the drying process, to be correspondingly high.
  • a significantly lower threshold value of the defrosting time has to be selected in order to ensure sufficient drying out.
  • the refrigerator may have a network interface 31 , for example to a WLAN or cellular network, via which the control unit 10 transmits a message to a networked appliance, such as a smartphone of the user in order to inform the user when the drying process is complete and the material 11 may be removed from the storage compartment 6 and replaced by fresh material.
  • a networked appliance such as a smartphone of the user
  • a special app may be installed on the networked appliance in order to process the message of the control unit 10 .
  • the processing may consist of immediately producing a—preferably acoustic or haptic—signal which the user is able to perceive without having to look at the networked appliance, and providing information which may be read by the user on a screen of the networked appliance, when the user activates the screen having been informed thereof by the signal.
  • a text messaging service which is known per se, such as SMS or WhatsApp and to use this text messaging service in order to transmit the message to the networked appliance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US16/342,034 2016-10-14 2017-10-04 Refrigerator having a drying function, and operating method therefor Abandoned US20190249915A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016220163.8A DE102016220163A1 (de) 2016-10-14 2016-10-14 Kältegerät mit Dörrfunktion und Betriebsverfahren dafür
DE102016220163.8 2016-10-14
PCT/EP2017/075185 WO2018069105A1 (de) 2016-10-14 2017-10-04 Kältegerät mit dörrfunktion und betriebsverfahren dafür

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US20190249915A1 true US20190249915A1 (en) 2019-08-15

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US16/342,034 Abandoned US20190249915A1 (en) 2016-10-14 2017-10-04 Refrigerator having a drying function, and operating method therefor

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US (1) US20190249915A1 (de)
EP (1) EP3526530B1 (de)
CN (1) CN109791013B (de)
DE (1) DE102016220163A1 (de)
WO (1) WO2018069105A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111981773B (zh) * 2020-07-23 2022-05-10 珠海格力电器股份有限公司 一种存储物烘干控制方法、装置及低温存储设备
DE102022200775A1 (de) 2022-01-25 2023-07-27 BSH Hausgeräte GmbH Backofen oder Gargerät mit Kühleinrichtung sowie Verfahren zum Enteisen

Citations (12)

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US5842355A (en) * 1995-03-22 1998-12-01 Rowe International, Inc. Defrost control system for a refrigerator
US20020148240A1 (en) * 2001-01-18 2002-10-17 Lawrence John Michael Walmsley Defrost control method and apparatus
US20110219805A1 (en) * 2008-12-30 2011-09-15 Lg Electronics, Inc. Non-freezing storage unit and refrigerator including the same
US20120042667A1 (en) * 2009-03-18 2012-02-23 Fulmer Scott D Microprocessor controlled defrost termination
US20120102984A1 (en) * 2010-10-28 2012-05-03 Samsung Electronics Co., Ltd Refrigerator and dehumidification control mehod thereof
US20130042641A1 (en) * 2011-08-16 2013-02-21 Samsung Electronics Co., Ltd. Refrigerator and control method thereof
US20130312436A1 (en) * 2012-05-22 2013-11-28 Nordyne Llc Heat pump with improved defrost cycle and method of defrosting a heat exchanger
US20140123690A1 (en) * 2012-11-07 2014-05-08 General Electric Company Method for improving efficiency of a refrigerator appliance during a defrost cycle
US20150192341A1 (en) * 2014-01-07 2015-07-09 General Electric Company Refrigeration system for a refrigerator appliance
US20170263100A1 (en) * 2016-03-14 2017-09-14 Amazon Technologies, Inc. Scent-based spoilage sensing refrigerator
US20170276420A1 (en) * 2014-08-29 2017-09-28 Qingdao Haier Smart Technology R&D Co., Ltd. Refrigerator

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Publication number Priority date Publication date Assignee Title
US4291542A (en) * 1977-01-19 1981-09-29 A/S Dantherm Air drying apparatus of the condensation type
US5842355A (en) * 1995-03-22 1998-12-01 Rowe International, Inc. Defrost control system for a refrigerator
US20020148240A1 (en) * 2001-01-18 2002-10-17 Lawrence John Michael Walmsley Defrost control method and apparatus
US20110219805A1 (en) * 2008-12-30 2011-09-15 Lg Electronics, Inc. Non-freezing storage unit and refrigerator including the same
US20120042667A1 (en) * 2009-03-18 2012-02-23 Fulmer Scott D Microprocessor controlled defrost termination
US20120102984A1 (en) * 2010-10-28 2012-05-03 Samsung Electronics Co., Ltd Refrigerator and dehumidification control mehod thereof
US20130042641A1 (en) * 2011-08-16 2013-02-21 Samsung Electronics Co., Ltd. Refrigerator and control method thereof
US20130312436A1 (en) * 2012-05-22 2013-11-28 Nordyne Llc Heat pump with improved defrost cycle and method of defrosting a heat exchanger
US20140123690A1 (en) * 2012-11-07 2014-05-08 General Electric Company Method for improving efficiency of a refrigerator appliance during a defrost cycle
US20150192341A1 (en) * 2014-01-07 2015-07-09 General Electric Company Refrigeration system for a refrigerator appliance
US20170276420A1 (en) * 2014-08-29 2017-09-28 Qingdao Haier Smart Technology R&D Co., Ltd. Refrigerator
US20170263100A1 (en) * 2016-03-14 2017-09-14 Amazon Technologies, Inc. Scent-based spoilage sensing refrigerator

Also Published As

Publication number Publication date
CN109791013A (zh) 2019-05-21
WO2018069105A1 (de) 2018-04-19
DE102016220163A1 (de) 2018-04-19
EP3526530B1 (de) 2020-09-23
CN109791013B (zh) 2021-09-03
EP3526530A1 (de) 2019-08-21

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