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WO2013000765A1 - Appareil de froid à bac d'évaporation et dispositif auxiliaire favorisant l'évaporation - Google Patents

Appareil de froid à bac d'évaporation et dispositif auxiliaire favorisant l'évaporation Download PDF

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Publication number
WO2013000765A1
WO2013000765A1 PCT/EP2012/061716 EP2012061716W WO2013000765A1 WO 2013000765 A1 WO2013000765 A1 WO 2013000765A1 EP 2012061716 W EP2012061716 W EP 2012061716W WO 2013000765 A1 WO2013000765 A1 WO 2013000765A1
Authority
WO
WIPO (PCT)
Prior art keywords
control unit
compressor
temperature
storage chamber
door
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.)
Ceased
Application number
PCT/EP2012/061716
Other languages
German (de)
English (en)
Inventor
Adolf Feinauer
Hans Ihle
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 Bosch und Siemens 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 Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of WO2013000765A1 publication Critical patent/WO2013000765A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • 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
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • F25D21/008—Defroster control by timer
    • 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
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/141—Removal by evaporation
    • 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
    • F25D2321/00—Details or arrangements for defrosting; Preventing frosting; Removing condensed or defrost water, not provided for in other groups of this subclass
    • F25D2321/14—Collecting condense or defrost water; Removing condense or defrost water
    • F25D2321/141—Removal by evaporation
    • F25D2321/1413—Removal by evaporation using heat from electric elements or using an electric field for enhancing removal

Definitions

  • the present invention relates to a refrigeration appliance, in particular a household refrigeration appliance such as a refrigerator or freezer, with an evaporation tray for the evaporation of condensate discharged from a storage chamber of the device, and a
  • Auxiliary device which is switchable to promote the evaporation of the dew water in the evaporation tray, if necessary.
  • heat-insulating wall of the refrigerator is passed to an evaporation tray.
  • the evaporation tray is located beyond the heat-insulating wall to release moisture evaporating from it freely to the environment.
  • Object of the present invention is therefore to provide an inexpensive and reliable solution with which sufficient evaporation of condensation can be ensured and at the same time a good energy efficiency of the refrigerator is maintained.
  • a refrigeration device Under a refrigeration device is in particular a household refrigeration appliance understood, ie a refrigeration appliance for household management in households or possibly in the
  • Catering area is used, and in particular serves to store food and / or drinks in household quantities at certain temperatures, such as a refrigerator, a freezer, a fridge-freezer, a freezer or a wine storage cabinet.
  • the object is achieved on the one hand by at a refrigeration device, in particular a household refrigerator, with at least one closable by a door storage chamber, an evaporation tray for the evaporation of derived from the storage chamber Condensation water and an auxiliary device, which can be switched by a control unit in order to increase the evaporation rate in the evaporation tray, the control unit be set up to control the operation of the auxiliary device as a function of the ambient temperature.
  • the main source of condensation on the evaporator is outside air that enters the storage chamber and its moisture content is highly dependent on its temperature.
  • control unit may be connected to a suitable temperature sensor. With comparable reliability cheaper techniques are feasible
  • the control unit can be set up to estimate the ambient temperature on the basis of the duration of an operating phase of the compressor.
  • the duration of an operating phase depends not only on the difference between the switch-on and switch-off temperature of the compressor, but also on the rate at which ambient heat penetrates into the storage chamber and delays its cooling during operation of the compressor. The higher the ambient temperature, the higher the rate, and accordingly, each operating phase lasts longer.
  • Refrigeration appliances are also known, in which the capacity of the compressor is variable and regulated to a value at which the compressor can run continuously or almost continuously while keeping the temperature of the storage chamber constant.
  • the capacity of the compressor to equalize the flow of heat from the storage compartment environment depends on the ambient temperature, specifically the difference between the ambient temperature and the temperature of the storage chamber, so that the performance to which the compressor is subjected at one such refrigeration device is regulated, also allows a conclusion on the ambient temperature.
  • the control unit is expediently arranged to detect an opening of the door and to control the operation of the auxiliary device based on the number and / or duration of the door openings detected.
  • the control unit may be connected to a switch operated by opening and closing the door.
  • control unit is connected to a temperature sensor for detecting the temperature in the storage chamber and is adapted to detect an opening of the door based on a jump caused thereby the temperature.
  • the consideration of the various above-mentioned, the amount of accumulating condensation water influencing variables can be done by the
  • Control unit is set up at each door open a count size to change an increment based on at least one of door opening duration, ambient temperature, compressor runtime, compressor performance, humidity in the storage chamber and
  • Rate of change of the evaporator temperature selected size and to operate the auxiliary device when the count size reaches a limit.
  • the control unit is in such a case
  • this device Preferably arranged to operate this device together with the defrost heater to quickly eliminate this condensation.
  • auxiliary device in particular a heater and / or a fan come into consideration.
  • Figure 1 is a schematic section in the width direction by a household refrigerator according to the present invention.
  • Fig. 3 is a flowchart of a method for controlling the evaporation
  • FIGS. 1 and 2 shows an exemplary temperature profile in the storage chamber of the refrigerator of FIGS. 1 and 2;
  • FIG. 7 is a flowchart of a method of controlling the auxiliary device based on the temperature history shown in FIG. 6; FIG. and
  • FIG. 8 is a flowchart of a second on the temperature profile of FIG. 6
  • Figs. 1 and 2 show schematic sections through a household refrigerator, to which the present invention is applicable.
  • the sectional planes of the two figures are shown in the other Fig.
  • the household refrigerator here a refrigerator, has in the usual way a heat-insulating housing with a body 1 and a door 2, which limit a storage chamber 3.
  • the storage chamber 3 is here cooled by a coldwall evaporator 4 arranged on its rear wall between an inner container of the body 1 and an insulating foam layer surrounding it, but it should be immediately obvious to the person skilled in the art that the features of the invention explained below also apply in connection with FIG any other types of evaporator are applicable.
  • the evaporator 4 is part of a refrigerator which further comprises a compressor 6 housed in a machine room 5 recessed from the cabinet 1 and a condenser not shown in the figures, which may for example be accommodated on the outside of the rear wall of the cabinet 1 or in the machine room 5 ,
  • a collecting channel 7 extends for condensed water, which is reflected at the area cooled by the evaporator 4 of the inner container and flows down there.
  • a pipeline 8 leads from the lowest point of the gutter 7 through the insulating
  • An electric heater 10 is here in the form of a inside of the
  • Evaporation tray 9 extending heating loop shown; It could also, for example, in the form of a film heater on an outer wall 1 1 of
  • Evaporation tray 9 may be mounted, in which case outside the film heater around still an insulating layer may be provided to ensure that the heater emits its heat substantially in the evaporation tray 9 inside.
  • a fan 12 may be arranged in the engine room 5 so that it drives an air flow over the water level of the evaporation tray 9. Since the on and off times of the
  • Heater 10 and the fan 12 are linked and preferably the same, the description may be limited to the case that both are present. Heating device 10 and fan 12 are controlled by an electronic
  • Control unit 13 which is shown here for simplicity in the engine room 5, but in practice largely arbitrarily on the refrigerator and in particular adjacent to a - not shown - control panel can be arranged.
  • the control unit 13 also controls the operation of the compressor 6 on the basis of a temperature sensor 14 arranged on the bearing chamber 3.
  • a simple on-off control of the compressor 6 can be provided within the scope of the invention, in which the control unit 13 turns on the compressor 6, when the temperature of the storage chamber, a switch-on threshold T a exceeds 3, and it turns off again as soon as the temperature of the storage chamber 3 is below a switch-off threshold T off.
  • step S31 the control unit 13 according to a first embodiment of the invention to control the operation of the heater 10 and the fan 12.
  • step S32 an internal counter c of the control unit 13 is incremented by an increment incr (T ext ,%), which directly or indirectly depends on the temperature T ext in the environment of the refrigeration device and possibly also on others Sizes depends.
  • an ambient temperature sensor can be provided on the refrigeration device outside the insulation layer. However, it is preferred to save the costs of such a sensor and to estimate the ambient temperature T ext in an indirect way, as will be explained in more detail below.
  • Another variable that can affect the increment is the duration of the
  • an air humidity sensor is provided in the storage chamber 3, its measured value can be used after re-closing the door 2 in order to quantitatively estimate the amount of water vapor in storage chamber 3 and to set the increment accordingly.
  • step S33 it is checked whether the counter has exceeded a limit value c ma x which corresponds to a critical water level in the evaporation tray 9. If so, in step S34, the heater 10 and / or the fan 12
  • step S35 the counter c is reset in step S35, and the process returns to the output. While heater 10 and fan 12 are in operation, the detection of door openings continues with steps S31, S32, S33 and the concomitant re-increment of counter c. Each after a predetermined period of operation, which is empirically determined as sufficient to a the
  • Threshold c ma x corresponding amount of water to evaporate and so to reduce the water level in the evaporation tray 9 back to a safe level, heater 10 and fan 12 are turned off again.
  • the control unit 13 In the case of on-off control of the compressor 6 by the control unit 13, it may be provided that, when the compressor 6 is in operation, the count value c is reduced by a predetermined decrement at regular time intervals. In the case that the compressor 6 is operated continuously at variable power, the amount of decrement can be set proportional or the time interval between two decrements inversely proportional to the compressor power.
  • FIG. 4 illustrates a first method for indirectly estimating the
  • step S41 it is waited until the temperature detected by the temperature sensor 14 temperature T of the storage chamber 3 rises above the turn-T a. Once this is the case, the compressor 6 is turned on and on in step S42
  • the timepiece can count on the count of
  • step S43 Clock periods of a clock of the control unit 13 based.
  • step S43 Once it is determined in step S43 that the temperature of the storage chamber 3 to the switch-off threshold T from has dropped, the compressor 6 is turned off again, the timer is stopped and since the step S42, elapsed time detected t, and the outdoor temperature T ext is the basis of a look-up table is estimated in which this is provided as a function f of the switch-on threshold (user adjustable) T and the period t of the compressor 6 is recorded.
  • the table that describes the relationship between f T a turn-on threshold, compressor running time t and ambient temperature T ext has been previously determined empirically by the manufacturer of the refrigeration unit and stored in a read-only memory of the controller. 13
  • 5 shows the flowchart of a method for estimating the
  • Ambient temperature T ext which is applicable to a refrigerator
  • the compressor 6 is switchable between different non-vanishing power levels. The procedure is repeated at regular intervals.
  • an upper limit T max and a lower limit T min are set for the temperature of the storage chamber 3, which should not be exceeded or fallen below for a long time if possible. If it is determined in step S51 when comparing the temperature T of the storage chamber 3 with the upper limit T max that the temperature T of the storage chamber 3 is above the upper limit T max , the power PV of the compressor 6 is increased by a predetermined increment in step S52 ⁇ increased.
  • the time interval between two repetitions of the method is chosen to be large enough to be able to observe an effect of the changed compressor power PV on the temperature T. If the compressor power PV after the increase is sufficient to lower the temperature T, and it is determined in step S51 that the temperature T has dropped below T max , then the process branches from step S51 to S53 where the temperature T is equal to the temperature T lower limit T min is compared. If this is not exceeded, the compressor power PV remains unchanged, and in turn begins after the predetermined time interval, the process again. Finally, if the temperature T is less than T min , in step S54 the
  • the compressor power PV continuously adapts to the cooling temperature of the storage chamber 3 that is variable according to the ambient temperature T ext .
  • the ambient temperature T ext can be used as a function of the actual temperature T of the storage chamber 3 or its user set limits T max , T min and the compressor power PV a table empirically determined for the respective model of the refrigerator can be estimated.
  • FIG. 6 shows typical courses of temperatures measured by the temperature sensor 14 over time, in each case as a solid line in the absence of
  • diffused air in the storage chamber 3 has distributed, differs from the
  • FIG. 7 shows a flow chart of a first method, which monitors the monitoring of
  • Temperature T in the storage chamber 3 is used to control the operation of heater 10 and fan 12. The process is repeated at regular intervals, regardless of whether the compressor 6 is turned on or not.
  • step S71 the temperature T, the storage chamber 3 is detected at the time of the ith iteration of the process. If the compressor is switched on at this time, this branches
  • step S72 Process in step S72 to step S73, where it is checked whether the measured value T, is higher than the measured value ⁇ obtained in the previous iteration. If not, the iteration is finished. Otherwise, the method reaches step S75. If it is determined in S72 that the compressor is off, it is checked in S74 whether the temperature T, is lower than the temperature Tu measured in the previous iteration. If not, the iteration is finished again, if yes, step S75 is reached. In S75 it is concluded that the door has been opened.
  • step S76 wait until either the compressor 6 changes its operating state or, if at the time of detection of the door opening the compressor 6 was turned on, the Temperature T begins to fall again or, if the compressor 6 was off, the temperature T starts to rise again.
  • control unit 13 normal values for the time derivative of the temperature T with switched on and off compressor 6 are known. These values can be programmed by the manufacturer, or they can be based on measurements of the temperature profile that the control unit 13 itself performs on the refrigeration device.
  • step S81 the current temperature T is first measured at the time of the ith iteration.
  • the time derivative dT, / dT is calculated in step S82 on the basis of a temperature value Tu measured in the respective preceding iteration.
  • Step S83 checks whether the derivative thus calculated is more positive than normal, i. as the rate of change of temperature that would be expected with the door closed, taking into account the compressor operating condition. If this is not the case, then the iteration ends; if it does, it is concluded in S84 that the door has been opened.
  • the starting point of the process is only returned when the thus obtained
  • Derivative values are normalized again, i. the disturbance caused by the door opening has subsided in the normal course of temperature.
  • This method can also replace step S31 in FIG. 3.

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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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

L'invention concerne un appareil de froid comportant au moins une chambre de stockage (3) pouvant être fermée par une porte (2), un bac d'évaporation (9) pour l'évaporation d'eau de condensation évacuée de la chambre de stockage (3), et un dispositif auxiliaire (10, 12) qui peut être activé par une unité de commande (13) pour augmenter la vitesse d'évaporation dans le bac d'évaporation (9). L'unité de commande (13) est conçue pour commander le fonctionnement du dispositif auxiliaire en fonction de la température ambiante (Text).
PCT/EP2012/061716 2011-06-29 2012-06-19 Appareil de froid à bac d'évaporation et dispositif auxiliaire favorisant l'évaporation Ceased WO2013000765A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011078322.9 2011-06-29
DE201110078322 DE102011078322A1 (de) 2011-06-29 2011-06-29 Kältegerät mit Verdunstungsschale und Hilfseinrichtung zur Verdunstungsförderung

Publications (1)

Publication Number Publication Date
WO2013000765A1 true WO2013000765A1 (fr) 2013-01-03

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Family Applications (1)

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PCT/EP2012/061716 Ceased WO2013000765A1 (fr) 2011-06-29 2012-06-19 Appareil de froid à bac d'évaporation et dispositif auxiliaire favorisant l'évaporation

Country Status (2)

Country Link
DE (1) DE102011078322A1 (fr)
WO (1) WO2013000765A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220099356A1 (en) * 2020-09-28 2022-03-31 Illinois Tool Works Inc. Refrigerated device with enhanced defrost and condensate pan heater control

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000866A2 (fr) * 2008-07-04 2010-01-07 Arcelik Anonim Sirketi Dispositif de refroidissement
DE102009028778A1 (de) * 2009-08-21 2011-02-24 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, insbesondere Haushaltskältegerät, sowie Verfahren zum Betrieb eines solchen Kältegerätes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000866A2 (fr) * 2008-07-04 2010-01-07 Arcelik Anonim Sirketi Dispositif de refroidissement
DE102009028778A1 (de) * 2009-08-21 2011-02-24 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät, insbesondere Haushaltskältegerät, sowie Verfahren zum Betrieb eines solchen Kältegerätes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220099356A1 (en) * 2020-09-28 2022-03-31 Illinois Tool Works Inc. Refrigerated device with enhanced defrost and condensate pan heater control

Also Published As

Publication number Publication date
DE102011078322A1 (de) 2013-01-03

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