WO2019166291A1 - Réfrigérateur avec dispositif de dégivrage par chauffage - Google Patents

Réfrigérateur avec dispositif de dégivrage par chauffage Download PDF

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Publication number
WO2019166291A1
WO2019166291A1 PCT/EP2019/054145 EP2019054145W WO2019166291A1 WO 2019166291 A1 WO2019166291 A1 WO 2019166291A1 EP 2019054145 W EP2019054145 W EP 2019054145W WO 2019166291 A1 WO2019166291 A1 WO 2019166291A1
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
fan
refrigerating appliance
control unit
appliance according
Prior art date
Application number
PCT/EP2019/054145
Other languages
German (de)
English (en)
Inventor
Andreas BABUCKE
Frank Cifrodelli
Original Assignee
BSH Hausgeräte 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 Hausgeräte GmbH filed Critical BSH Hausgeräte GmbH
Priority to CN201980015436.9A priority Critical patent/CN111788442B/zh
Priority to EP19706582.4A priority patent/EP3759405B1/fr
Publication of WO2019166291A1 publication Critical patent/WO2019166291A1/fr

Links

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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control

Definitions

  • the present invention relates to a refrigeration device with a defrost heater, in particular a household refrigeration appliance in no-frost construction, in which an evaporator to be defrosted by the defrost heater is housed in a separate evaporator chamber from a storage chamber and the storage chamber is cooled by an air flow from a fan is circulated between the evaporator chamber and the storage chamber.
  • the increasing thickness of the frost layer over time obstructs both air circulation and heat exchange between the air circulating in contact with the evaporator and a refrigerant evaporating in the evaporator, so that with increasing thickness of the frost layer, an ever higher fan output is required, to maintain the air circulation between the evaporator chamber and the storage chamber, and an ever lower evaporator temperature is required to cool the circulating air to a desired temperature for the storage compartment. Both increase the energy consumption of the refrigerator.
  • the frost layer must be removed from time to time.
  • a simple solution is to operate the defrost heater at regular intervals. However, this leads to the defrost heater also being turned on unnecessarily if little or no frost has formed within the fixed time interval. In such a case, the energy expenditure for defrosting unnecessarily impairs the energy efficiency of the refrigeration appliance.
  • US 5 522 232 A describes a hoop sensor in which a first temperature sensor in a hermetically sealed chamber and a second temperature sensor is housed in a chamber communicating with its surroundings via slots, and the temperature difference between the sensors disappears when the slots are closed by frost.
  • EPO 713 065 B1 describes the use of a capacitive sensor for detecting ice on an evaporator.
  • Object of the present invention is to provide a refrigeration device and an operating method for this, which allow simple and inexpensive means a needs-based control of the defrost heater.
  • a refrigerating appliance in particular a household refrigeration appliance, with an evaporator, a fan for driving an air flow through the evaporator, a cooled by the air flow storage chamber, a defrost heater for defrosting the evaporator and a control unit for controlling the operation the defrost heater, the control unit is adapted to compare a representative of a pressure drop at the evaporator size with a limit and to start the defrost heater when the limit is exceeded.
  • control unit may be connected to at least one pressure sensor which is exposed to the air pressure prevailing on an inlet side or an outlet side of the evaporator. If such a pressure sensor is already provided, for example, to control a door opening aid, it can be used at no additional cost for the control of the defrost heater.
  • the representative variable responsible for the pressure drop is an electrical quantity of the fan. Electrical quantities can be detected without the need for an additional sensor in the vicinity of the evaporator; the measurement data required to determine the representative quantity can be obtained via suitable circuits on an engine of the Fan and in particular be tapped at a power supply of the fan.
  • the electric power of the fan can be used as a representative variable. Since the operating voltage of the fan is fixed and immutable in the simplest case, a measurement of the current consumed by the fan is equivalent to a determination of the power. In the case that the operating voltage of the fan is variable, the quotient of electric power and operating voltage can be equivalently determined as a representative quantity.
  • the fan speed can also be used as the representative variable associated with the power.
  • the control unit should be set up to monitor the ratio of the representative size when the door of the storage chamber is closed and to interrupt monitoring when the door is open. There may be several reasons for such an interruption, for example, the operation of the fan may be coupled to the position of the door to prevent hot, humid air from entering the storage chamber when the door is open by turning off the fan when the door is open and their moisture can immediately settle on the evaporator. If the fan is off when the door is open, there is no meaningful measure of the horsepower output and fan speed.
  • a second reason is that the performance of the fan is determined not only by the flow resistance of the evaporator, but also by that of the storage chamber. Therefore, due to the removal or addition of refrigerated goods in the storage chamber with the door open the flow resistance can change suddenly, without this being due to a change in the amount of frost on the evaporator.
  • the limit may be the sum of the representative quantity immediately after defrosting of the evaporator and a predetermined deviation.
  • the control unit should be set up to update the limit value after closing the door
  • control unit can be set up to detect the representative size before and after closing the door and to adjust the limit value based on the difference between these two detected variables, in particular to change it by this difference. This can prevent that changes in the representative size, which arise during the opening of the door by removal or addition of refrigerated goods, affect the control of the defrost heater.
  • control unit should be arranged to detect the representative size prior to compressor shutdown so that when the door is opened while the compressor is off, a meaningful representative value measurement is available.
  • the object is further achieved by a method for operating a refrigeration device, in particular as described above, with the steps:
  • Fig. 2 the relationship between pressure loss and fin spacing in one
  • Lamella evaporator Lamella evaporator
  • Fig. 3 characteristics of a fan
  • FIG. 4 shows an exemplary temporal development of the pressure drop at the evaporator of the refrigerator of FIG. 1;
  • FIG. 5 shows a flow chart of a working method executed by a control unit of the refrigerator of FIG. 1.
  • FIG. 1 shows a no-frost combination device in a schematic section in the depth direction.
  • a body 1 of the refrigerator two cavities are bounded by a preferably made of plastic integrally deep-drawn inner container 2.
  • One of the cavities is a storage chamber, here a normal cooling compartment 3.
  • the other cavity is divided by a vertical partition 4 in a second storage chamber, here a freezer compartment 5, and an evaporator chamber 6.
  • Both storage chambers 3, 5 are each closed by a door 20.
  • the invention described below is of course also applicable to refrigerators with a single or more than two storage chambers.
  • the evaporator chamber 6 includes a fin evaporator 7 with arranged parallel to the sectional plane of Fig. 1 fins.
  • a defrost heater 10 for defrosting the finned evaporator 7 is housed.
  • a compressor 19 for driving the flow of refrigerant through the finned evaporator 7 is housed.
  • the space 8 forms here an inlet volume at an upstream side of the finned evaporator 7, which communicates with the freezer compartment 5 via an entrance slit 1 1.
  • the vertical partition wall 4 contains a distribution chamber 12, which communicates via an opening, on which a fan 13 is arranged, with a second, here downstream, free space 14 of the evaporator chamber 6 above the evaporator 7.
  • a first outlet 15 of the distribution chamber 12 opens into the freezer compartment 5 close to the ceiling.
  • Another outlet is formed by a line 16 extending in a wall of the body 1 to the normal cooling compartment 3.
  • a controlled by a thermostat flap can be provided, which allows to suppress the cold air supply to the normal refrigeration compartment 3, if there is only 5 cooling needs in the freezer compartment. If there is a need for cooling in the normal cooling compartment 5 and the flap is therefore open, the cold air circulated by the fan 13 is distributed to both storage chambers 3, 5.
  • a fan in the evaporator cools air cooled into the freezer, air from the freezer via a gap or other passage passes into the normal refrigeration compartment and air is sucked from the normal refrigeration compartment in the evaporator.
  • the pressure drop Dr at the evaporator 7 can be estimated by the following formula:
  • L is the length of the evaporator 7 in the flow direction of the air flow
  • H is the height of the evaporator measured transversely to the flow direction in the plane of one of the slats
  • d is the free slit width between two slats
  • n is the number of slats
  • m is the dynamic viscosity of the air
  • V designates the volume flow.
  • the pressure loss Dr is inversely proportional to the cube of the free gap width d and thus reacts sensitively to the thickness of the frost layer on the lamellae.
  • a differential pressure sensor 21 may be connected to the two free spaces 8, 14.
  • an absolute pressure sensor may alternatively be provided on one of the two free spaces 8, 14. A pressure sensor is not needed when the pressure loss Dr is estimated from electric operating quantities of the fan 13, as described below.
  • FIG. 2 illustrates the pressure loss Dr, against which the fan 13 works, as a function of the gap width d.
  • a free gap width d of 5 mm between the lamellae and for the circulation through the storage chambers 3, 5 is assumed to be independent of the gap width contribution to the pressure loss Dr of 15 Nm / m 2 .
  • the electric motor of the fan 13 can react differently to the change in the pressure loss Dr depending on the design or operating point, for example by slower running or by increased power consumption.
  • 3 shows exemplary characteristic curves for the power P, the efficiency n and the pressure drop Dr of the fan 13 as a function of the volume flow V.
  • the operating point of the fan 13 should be in the vicinity of a maximum of the efficiency n, shown as a solid curve.
  • the pressure loss Dr shown as dashed curve
  • the power P shown as a dotted curve
  • FIG. 4 shows schematically a temporal development of the pressure drop at the evaporator 7 of the refrigeration device from FIG. 1;
  • FIG. 5 shows a flowchart of a working method executed by a control unit 18 of the refrigeration device from FIG. 1.
  • the free gap width in the evaporator 7 is in each case a maximum, if eliminated by the operation of the defrost heater 10 all adhering to the fins of the evaporator 7 frost.
  • the pressure loss Dr, against which the fan 13 must work essentially determined by a flow resistance of the bearing chambers 3, 5.
  • this is not known a priori, since in the storage chambers 3, 5 refrigerated goods placed depending on its amount and Arrangement, the flow of air can impede different degrees.
  • step S2 the control unit 18 sets the compressor 19 in motion to resume the cooling of the evaporator 7.
  • step S3 the fan 13 is turned on. If this has reached a stationary rotational speed after a few seconds, the current I detected by the fan 13 is detected as the quantity representative of the pressure loss Dr (S4).
  • the measured value l 0 obtained in this case is stored in step S5. Its amount will generally vary from one defrosting operation to another since it depends on the distribution of the refrigerated goods in the chambers 3, 5.
  • a limit value l en d of the amperage is set which, if exceeded, is assumed to have accumulated again so much frost on the evaporator 7 that defrosting is necessary.
  • the limit l en d is calculated in step S6 as the sum of the previously stored initial value l 0 and a predetermined difference value D.
  • the current intensity I is again detected and compared in step S8 with the limit value l en d.
  • the process branches to step S9 to check whether the door 20 of one of the storage chambers 3, 5 is open.
  • step S10 If the doors 20 are closed, it is next checked in step S10 whether the compressor 19 - because the cooling demand is satisfied in both storage compartments 3, 5 - is turned off. Then, in the sequence, the fan 13 is turned off, so that no meaningful reading of the current I is more to win. In this case, the checks of steps S9, S10 are repeated until either refrigeration demand in at least one of the storage compartments 3, 5 causes the compressor 19 and consequently also the fan 13 to be switched on again and the method to step 7 returns or a user opens one of the doors 20.
  • the last measured value l t of the current intensity (which may be a value that has not been updated since the compressor 19 was switched off) is stored in step S1 1.
  • the fan 13 is turned off S12, to prevent moist ambient air that passes through the open door 20 in the storage chamber 3 or 5, from there immediately to the evaporator 7 is pumped further and there contributes to the formation of frost.
  • Evaporator 7 is deposited, which is recorded by the fan 13
  • the processing unit waits until the door 20 is closed again at time t 2 in FIG. 4, and then returns to step S3.
  • the fan 13 is running again, and the frost layer in the evaporator 7 continues to increase in thickness.
  • the current value can be exceeded the limit which was valid in the time interval [0, ti], without triggering a start of the defrost heater 10.
  • the door 20 is opened again, which the control unit 18 recognizes in step S9, the most recent interim current measured value is stored in step S1 1, and based on the stored value, the difference value D is updated again in step S13.
  • step S3 the door is closed again 20, so that the process returns to step S3.
  • the storage chambers 3, 5 are vacated this time largely empty, so that contained refrigerated goods hardly contributes to the pressure loss Dr and now measured current strength l 4 is significantly lower than before the door opening.
  • the limit value l end is updated once more in step S6. Since the few chilled goods still containing only a small amount of moisture, the increase of the frost in the evaporator 7 is also reduced, which is reflected in a slower increase in the current intensity I from t 4 compared to the time interval [t 2 , t 3 ].
  • step S15 in which the heater 10 is turned on.
  • compressor 19 and fan 13 are turned off.
  • the difference value D is reset to a predetermined value D 0 corresponding to a vaporizer 7 which has been completely freed of frost. If it is determined in step S17 that the defrosting operation is completed and refrigeration is required again in one of the storage chambers 3, 5, the process returns to step S2.

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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)
  • Defrosting Systems (AREA)

Abstract

L'invention concerne un réfrigérateur, en particulier un réfrigérateur domestique, qui comprend un évaporateur (7), un ventilateur (13) destiné à entraîner un flux d'air à travers l'évaporateur (7), une chambre de stockage (3, 5) refroidie par le flux d'air, un dispositif de dégivrage par chauffage (10) destiné à dégivrer l'évaporateur (7) et une unité de commande (18) destinée à commander le fonctionnement du dispositif de dégivrage par chauffage (10). L'invention est caractérisée en ce que l'unité de commande (18) est adaptée pour comparer une grandeur (I), représentative d'une chute de pression au niveau de l'évaporateur, à une valeur limite (Iend) et pour démarrer le dispositif de dégivrage par chauffage (10) lorsque la valeur limite est dépassée.
PCT/EP2019/054145 2018-02-28 2019-02-20 Réfrigérateur avec dispositif de dégivrage par chauffage WO2019166291A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980015436.9A CN111788442B (zh) 2018-02-28 2019-02-20 具有除霜加热装置的制冷器具
EP19706582.4A EP3759405B1 (fr) 2018-02-28 2019-02-20 Appareil frigorifique et procédé de fonctionnement d'un appareil frigorifique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018202971.7A DE102018202971A1 (de) 2018-02-28 2018-02-28 Kältegerät mit Abtauheizung
DE102018202971.7 2018-02-28

Publications (1)

Publication Number Publication Date
WO2019166291A1 true WO2019166291A1 (fr) 2019-09-06

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ID=65516620

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Application Number Title Priority Date Filing Date
PCT/EP2019/054145 WO2019166291A1 (fr) 2018-02-28 2019-02-20 Réfrigérateur avec dispositif de dégivrage par chauffage

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EP (1) EP3759405B1 (fr)
CN (1) CN111788442B (fr)
DE (1) DE102018202971A1 (fr)
WO (1) WO2019166291A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020215658A1 (de) * 2020-12-10 2022-06-15 Glen Dimplex Deutschland Gmbh Vorrichtung sowie Verfahren zur Erkennung eines Belags auf einer Wärmetauscherfläche
CN114234520B (zh) * 2021-12-21 2023-12-29 海信冰箱有限公司 一种冰箱及其化霜控制方法
DE102022206632A1 (de) 2022-06-30 2024-01-04 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betrieb einer Kraftwärmemaschine und eine Kraftwärmemaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643457A (en) * 1970-11-20 1972-02-22 Westinghouse Electric Corp Frost detector for refrigeration system
DE2922633A1 (de) * 1979-06-02 1980-12-04 Stiebel Eltron Gmbh & Co Kg Verdampfer einer waermepumpe
US5522232A (en) 1994-09-19 1996-06-04 Ishizuka Electronics Corporation Frost detecting device
EP0713065B1 (fr) 1994-11-17 2001-01-10 Whirlpool Europe B.V. Dispositif compact en dimension - pour détecter le givre sur un évaporateur d'un réfrigérateur
US20140150477A1 (en) * 2012-11-30 2014-06-05 Yi Qu Defrost Control Using Fan Data
WO2017131426A1 (fr) * 2016-01-29 2017-08-03 엘지전자 주식회사 Réfrigérateur

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10315523A1 (de) * 2003-04-04 2004-10-14 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit adaptiver Abtauautomatik und Abtauverfahren dafür
CN100538202C (zh) * 2005-07-29 2009-09-09 大金工业株式会社 冷冻装置
JP5590195B1 (ja) * 2013-07-11 2014-09-17 株式会社富士通ゼネラル 空気調和装置
CN105737475B (zh) * 2016-03-18 2019-01-18 青岛海尔股份有限公司 一种冰箱及其控制方法
CN106440636B (zh) * 2016-09-21 2018-10-23 合肥华凌股份有限公司 一种冰箱风门结冰检测控制方法、系统、装置及冰箱

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3643457A (en) * 1970-11-20 1972-02-22 Westinghouse Electric Corp Frost detector for refrigeration system
DE2922633A1 (de) * 1979-06-02 1980-12-04 Stiebel Eltron Gmbh & Co Kg Verdampfer einer waermepumpe
US5522232A (en) 1994-09-19 1996-06-04 Ishizuka Electronics Corporation Frost detecting device
EP0713065B1 (fr) 1994-11-17 2001-01-10 Whirlpool Europe B.V. Dispositif compact en dimension - pour détecter le givre sur un évaporateur d'un réfrigérateur
US20140150477A1 (en) * 2012-11-30 2014-06-05 Yi Qu Defrost Control Using Fan Data
WO2017131426A1 (fr) * 2016-01-29 2017-08-03 엘지전자 주식회사 Réfrigérateur

Also Published As

Publication number Publication date
CN111788442B (zh) 2022-10-14
EP3759405B1 (fr) 2023-11-22
CN111788442A (zh) 2020-10-16
DE102018202971A1 (de) 2019-08-29
EP3759405A1 (fr) 2021-01-06

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