EP2769155A2 - Appareil de froid à bac d'évaporation et dispositif de chauffe favorisant l'évaporation - Google Patents

Appareil de froid à bac d'évaporation et dispositif de chauffe favorisant l'évaporation

Info

Publication number
EP2769155A2
EP2769155A2 EP12780139.7A EP12780139A EP2769155A2 EP 2769155 A2 EP2769155 A2 EP 2769155A2 EP 12780139 A EP12780139 A EP 12780139A EP 2769155 A2 EP2769155 A2 EP 2769155A2
Authority
EP
European Patent Office
Prior art keywords
evaporation
temperature
phase
operation phase
refrigerating 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.)
Granted
Application number
EP12780139.7A
Other languages
German (de)
English (en)
Other versions
EP2769155B1 (fr
Inventor
Roland Bender
Adolf Feinauer
Wolfgang FLICKINGER
Hans Ihle
Peter LIENHART
Achim Paulduro
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 EP2769155A2 publication Critical patent/EP2769155A2/fr
Application granted granted Critical
Publication of EP2769155B1 publication Critical patent/EP2769155B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
  • Heating device that is operable to promote, if necessary, the evaporation of the condensation water in the evaporation tray.
  • the condensate which is reflected in the storage chamber, reaches there via stored refrigerated goods as well as in the form of water vapor, which is contained in the entering each time the door of the refrigerator in the storage chamber ambient air.
  • the extent of the water entry, and thus the rate at which it flows out of the storage chamber of the evaporation tray, is difficult to estimate, as it depends on numerous factors such as type of refrigerated goods and its packaging, temperature and percentage humidity of the ambient air and the amount of Door opening between the environment and storage chamber exchanged air dependent, and various of these sizes are barely measurable with reasonable effort.
  • the construction of the refrigeration unit must ensure that the condensation water of the evaporation tray evaporates quickly enough to reliably prevent overflow, which could damage the refrigeration unit and its surroundings.
  • Evaporation bowl is essential. In order to control the heater suitable, it is therefore necessary to monitor the water level in the evaporation tray.
  • Evaporating tray arranged temperature sensor is used to gain information about the water level. If, during defrosting of this conventional refrigeration appliance, condensate enters the evaporation tray in large quantities, a heating device is activated in order to evaporate the resulting water, and the resulting
  • the rate of temperature rise in the heating phase exceeds a threshold, it is assumed that there is no more water in the evaporation tray and heating of the tray is stopped. To remove condensation that enters the evaporation tray between defrosts, it is heated from time to time, and the temperature rise rate measured determines whether or not the tray contains water that needs to be evaporated.
  • the average temperature during the evaporation operation is significantly lower than the maximum temperature. Accordingly, the average evaporation rate is also significantly lower than the evaporation rate at the maximum temperature. Furthermore, the one needed to achieve the maximum temperature Heating device significantly more powerful than a heater that achieves the same evaporation effect by keeping the evaporation tray constant at a medium temperature.
  • Object of the present invention is in a refrigerator with one of a
  • Heating device heated evaporation tray the energy consumption of
  • Evaporating tray arranged temperature sensor, a connected to the temperature sensor control unit and a heater that is operable by the control unit to increase the evaporation rate in the evaporation tray, the control circuit is set, based on a change in the temperature detected by the temperature sensor during a measuring operation phase of the heater over Continued operation or not operation of the heater to decide and one
  • Evaporate operating phase of the heater in which the evaporation tray is heated above the highest measured in the measuring operation phase temperature, only to initiate when the change is weaker than a first limit. In this way, since the temperature rise in the measurement operation phase can be limited to a few degrees, checking whether the evaporation tray contains dew water in an amount that requires heating requires little energy.
  • Evaporating operation phase as soon as possible, without intermediate cooling of the evaporation tray, follow the measuring operation phase, so that not spent for the measuring operation phase heating energy is lost unused.
  • the extent to which the measured temperature change is below the first limit is a quantitative measure of the amount of water in the water
  • the control circuit can therefore be set up expediently, the duration of an evaporation operating phase following the measurement operation phase the heating device on the basis of the level below the limit. In this way it can be ensured that a single
  • Evaporating phase sufficient to reduce the amount of water in the evaporation tray to an acceptable level, and energy losses by cooling the shell between two short consecutive evaporation operating phases can be avoided.
  • Evaporating phase sufficient to reduce the amount of water in the evaporation tray to an acceptable level, and energy losses by cooling the shell between two short consecutive evaporation operating phases can be avoided.
  • Evaporator temperature can reach a higher evaporation rate than with a fluctuating temperature, so that a high water level in the evaporation tray can be allowed before the heater must be taken to help to eliminate the water.
  • the frequency with which the heating device must be operated is reduced.
  • the evaporation tray is preferably mounted on the compressor.
  • control circuit is further configured, according to a
  • Evaporating phase of operation to determine the rate of decrease of the temperature detected by the sensor, and to begin another evaporation phase of operation, when the decrease rate is below a second limit. Too slow a decrease in temperature indicates the presence of a large amount of water in the shell. Such a measurement of the rate of decrease of the temperature is particularly useful if the duration of the evaporation operating phase has not been determined as described above as a function of the results of the measurement operation phase, but is fixedly predetermined.
  • measuring operation phase Define measuring operation phase and, if the deviation has fallen below the third limit, after a short time, if the third limit is not exceeded after a long time, to repeat the measuring operation phase. If a shortfall of the third limit value indicates a large amount of water in the evaporation tray which can not be eliminated in a single phase of the evaporation operation, then after a short time recheck if the water level in the evaporation tray is at a critical level, and re-heat if necessary to accelerate evaporation.
  • the third limit may be equal to the first limit or lower.
  • the duration of the measurement operation phase may be fixed, and as a measure of the change in the temperature in the measurement operation phase, the difference between the temperature at the beginning of the measurement operation phase and the temperature at the end of the measurement operation phase may be formed.
  • the duration of the measuring operation phase can then be selected between 405 and 30 minutes.
  • control unit may also be arranged to terminate a measurement operation phase if the difference between the measured and actual temperature at the beginning of the measurement operation phase is a set value of e.g. has reached up to 10 K or up to 6 K, and to judge the temperature change the more, the shorter the measurement bed phase has been. Since the time to reach the setpoint of the
  • a fluctuating supply voltage can greatly affect the rate of increase of the temperature in a measuring or during a predetermined
  • control unit comprises means for
  • Estimating the supply voltage, and the first limit value or the duration of the measuring operation phase is predetermined as a function of the supply voltage.
  • the object is further achieved by a method for monitoring the water level in an evaporation tray of a refrigeration appliance, in particular as is known from the
  • Control unit of the above-described refrigeration device is executed, with the steps:
  • measured temperature is heated when the change is weaker than a first limit.
  • Fig. 1 is a schematic section in the width direction by a
  • Evaporation tray of the refrigerator of Figures 1 and 2; 4 shows a flowchart of a method for controlling the heating device of the refrigeration device, through which the temperature profile shown in FIG. 3 can result, according to a first embodiment of the invention
  • FIG. 5 is a flow chart of a method of controlling the heater according to a second embodiment.
  • FIG. 6 shows an alternative sequence of the measuring operation phase of the method according to FIG.
  • Figures 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 figure as a dotted line l-l or II-II.
  • the household refrigerator here a refrigerator, has in the usual way
  • the heat-insulating housing having a body 1 and a door 2 defining a storage chamber 3.
  • the storage chamber 3 is here by a on its rear wall between an inner container of the body 1 and a surrounding insulating
  • a collecting channel 7 extends at the foot of the rear wall of the storage chamber 3 cooled by the evaporator 4
  • a pipeline 8 leads from the lowest point of the gutter 7 through the insulating foam layer through to an evaporation tray 9, which is mounted in a machine room 5 on a housing of a compressor 6 to be heated by waste heat of the compressor 6.
  • a corresponding pipeline could emanate from the bottom of a chamber receiving the evaporator.
  • An electric heater 10 is here in the form of an inside of the
  • Evaporation tray 9 shown extended heating loop; she could too
  • Evaporation tray 9 may be mounted, in which case outside the film heater around an insulating layer can still 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 has an air flow above the water level of the
  • Evaporating tray 9 drives.
  • 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 switches the heating device 10 and the fan 12 on and off at the same time; It is also conceivable to let the fan 12 run after switching off the heating device 10 for a while to exploit heat that is still present in the water of the evaporation tray 9 at this time, for the evaporation.
  • the control unit 13 is connected to a temperature sensor 15, which is mounted in or on the evaporation tray 9 and with condensation in the
  • Evaporation tray 9 if any, is in thermal contact.
  • the same control unit 13 can also control the operation of the compressor 6 on the basis of a temperature sensor 14 arranged on the bearing chamber 3.
  • Condensation can more or less continuously, or, if the evaporator 4 cools in an operating phase of the compressor 6 below 0 ° C and thawed again during the standstill of the compressor 6, in time of the operating phases of the compressor 6 flow from the storage chamber 3 into the evaporation tray 9 , In order to use the waste heat of the compressor 6 efficiently, it is expedient to store a large amount of water in the evaporation tray, which holds the heat long and a large free
  • the water level should not be so high be that in the case of a strong inflow from the storage chamber 3 the
  • Evaporation tray 9 overflows. It is therefore necessary to be able to estimate the amount of water in the evaporation tray 9 in order to judge whether it
  • control unit 13 tests from time to time the water level in the evaporation tray by turning on the heater 10 and by means of the temperature sensor 15, the resulting temperature change of
  • Evaporation tray 9 monitored. In the simplest case, this measurement of the water level in regular
  • the waiting time between two measurements may vary under certain conditions: If at a time when the nominal waiting time has expired, the compressor is in operation, it also contributes to the heating of the water in the evaporation tray, so that one this time measurement would give a wrong result. Even some time after the compressor is switched off, this still gives off heat to the evaporation tray and possibly drives a convection movement of the water in the tray, which can lead to heat emitted by the heating device 10 reaching the temperature sensor 15 more quickly or more slowly than in the case that when you turn on the
  • Heating device 10 of the compressor 6 is cold and the water in the evaporation tray 9 is at rest.
  • control unit 13 waits if, at the end of the nominal waiting time of the
  • Compressor 6 in operation or is still warm from a previous hive, for a predetermined period of time from switching off the compressor 6 from before it turns on the heater 10 for measuring the water level.
  • the water level measuring control unit 13 may turn on the heater 10 each at a compressor start or at a predetermined delay to a compressor start.
  • the waste heat of the compressor 6 contributes to the measured temperature increase, and the power of the heater 10 needed to achieve a given temperature rise is lower, which in turn reduces the temperature rise
  • the refrigeration device has an automatic defrost, especially in a NoFrost device, condensate enters the evaporation tray 9 every time the evaporator is defrosted. As a result, the temperature of the water in the
  • Evaporation tray 9 fall significantly below that of the surrounding engine room 5, and heating of the water takes place without the help of the heater 10 by temperature compensation with the surrounding engine room. This too
  • Temperature compensation can falsify a measurement of the water level. Therefore, in these refrigerators, the control unit 13 is set up, a water level measurement, which is due at a time, because of a current or recent past
  • Defrosting temperature changes in the evaporation tray 9 are expected to suspend until these temperature changes have subsided again.
  • control unit 13 has means for detecting a past one
  • FIG. 3 shows the temperature profile of the evaporation tray 9 detected by the sensor 15 over several water level measurements. For the sake of clarity of presentation, times in which the temperature of the evaporation tray is increased by the operation of the compressor 6 and therefore water level measurements are excluded are shown in the diagram of FIG Fig. 3 hidden.
  • a first measuring operating phase begins. The water level in the evaporation tray 9 is low, and the evaporation tray heats up accordingly fast.
  • the end of the measuring operation phase the
  • Evaporation operating phase easily be several 10 K.
  • the temperature of the second part of the evaporation phase the temperature of the second part of the evaporation phase
  • a thermostat control can take place based on the measurement value of the temperature sensor 15, i. the control unit 13 switches off the heating device 10 when Tmax is exceeded, and switches it on again if Tmax - ⁇ is undershot, where ⁇ is a small positive value, and preferably smaller than dTmin.
  • control unit 13 ends the evaporation operation phase by turning off the heater 10.
  • the temperature goes back to TO with time, and the cycle shown in FIG. 3 repeats.
  • FIG. 4 is a flowchart showing a working procedure of the control unit 13, the embodiment of which can give the temperature profile shown in FIG. 3.
  • the process starts measuring the exit temperature TO of the evaporation tray 9 at the beginning of a measuring operation phase in step S1.
  • the heater 10 is
  • step S2 is switched on (step S2) and the control unit 13 waits for the predetermined duration At1 of the measuring operation phase (step S3), before it in step S4 another
  • step S5 Temperature reading T1 records.
  • step S5 the temperature change T1 -T0 reached during the measuring operation phase is subtracted from the threshold value dTmin. If the difference dT thus obtained is negative, then in the course of the measuring operation phase, the temperature in the evaporation tray has increased more than dTmin, corresponding to the measurement operating phases [to, t1] and [t2, t3] of Fig. 2.
  • the process branches from step S6 to S7, where the heater 10 is turned off again, and in step S8, a predetermined period of time At2 is waited before the start of a new measurement operating phase, which is many times longer than At1.
  • step S6 If it is determined in step S6 that dT is greater than or equal to 0, corresponding to the case of the measuring operation phase [t4, t5] of FIG. 3, then the method goes into
  • step S9 a time period At3 is awaited before the process goes to step S7 and thus ends the Schufeldsphase.
  • the heater may operate continuously to heat the bowl to Tmax and intermittently operate in a second portion to maintain it at that temperature.
  • the duration At3 of the evaporation phase of operation can be fixed. In this case, at the end of the evaporation operation phase, it is not certain that the water level in the evaporation tray 9 has been lowered to a safe level. Therefore, it is appropriate in this case, the waiting time At2 of step S8 following a
  • step S1 a temperature reading TO is also taken in again (step S1 1), and a second temperature reading T1 is taken after waiting the time period At1 (S12) in step S13.
  • step S14 the difference TO - T1 with a second limit dTmin 'compared. If the difference is smaller than the limit dTmin ', ie, the temperature slowly decreases, then this is an indication that the amount of water in the evaporation tray 9 is still large. In this case, as shown, the method may jump back directly from S14 to S1 to the
  • step S6 Repeat the measuring operation phase and to decide at the end of it in step S6 definitely whether another evaporation operating phase is connected. Alternatively, if the falling short of the threshold value dTmin 'is detected in step 14, the heater 10 may unconditionally be turned on again and to step S9
  • step S14 indicates a rapid drop in temperature, the amount of residual water in the evaporation tray 9 is apparently small, and the process returns to step S8.
  • dT the greater dT, the more the temperature rise in the measuring phase of operation has lagged behind the limit dTmin, and the greater the amount of water in the evaporation tray 9 must be.
  • the relationship between dT and the amount of water in a given refrigerator model can be determined empirically. Based on such empirical data, it is possible to set At3 as a function of dT such that the
  • Time period At3 sufficient to reduce the water level in the evaporation tray 9 to a non-critical value.
  • FIG. 6 shows an alternative embodiment of the measuring operating phase, which is applicable to all of the above-described embodiments of the operating method of the control unit 13.
  • Steps S1 and S2 of measuring the output temperature TO and turning on the heater 10 at the beginning of the measuring operation phase are the same as those described with reference to FIG. 4.
  • a timer is started (step S3 ').
  • the temperature T of the evaporation tray 9 is then continuously monitored until it has risen by at least dTmin (S4 '). Once this is the case, the timer is read in step S5 '.
  • a low measured value t of the timer shows a rapid increase in temperature or a Low water level, and it follows the step S7, as described with reference to FIG. 4.
  • a time reading t> tmax indicates the exceeding of the critical water level in the evaporation tray 9, so that the process proceeds to step S9, as referring to FIG. 4 or 5
  • the power of the electric heater 10 is proportional to the square of the supply voltage applied thereto. If this voltage is the mains voltage or a voltage derived from the mains voltage proportional to it, the effect is
  • the control unit is equipped with a voltage sensor for detecting the supply voltage of the heating device. Variations in the supply voltage can then be compensated in different ways. For example, In the method according to FIG. 4 or 5, the duration At1 of the measuring operating phase can be inversely proportional to the square of the
  • Supply voltage are set so that the amount of heat released in each measurement phase of operation, regardless of the exact value of the supply voltage is the same.
  • the limit value dTmin can be set directly proportional to the square of the supply voltage. Then, the duration of the measuring operation phase is independent of the value of the operating voltage, but at low voltage, the limit value of the temperature rise, below which an excessively high, heating water level is detected, adjusted according to the reduced amount of heat released.

Abstract

L'invention concerne un appareil de froid, en particulier un appareil électroménager, comportant au moins un compartiment de stockage (3), un bac d'évaporation (9) pour l'évaporation de l'eau de condensation évacuée du compartiment de stockage (3), un capteur de température (15) situé sur le bac d'évaporation (9), une unité de commande (13) reliée au capteur de température (15), et un dispositif de chauffe (10) pouvant être commandé par l'unité de commande (13) pour augmenter le taux d'évaporation dans le bac d'évaporation (9). Le circuit de commande (13) est conçu pour décider (S6; S6'), à l'aide d'une modification (T1 -T0) des températures relevées (T0, T1) par le capteur de température (15) pendant une phase de mesure ([t0, t1], [t2, t3], [t4, t5]; S1-S5, S1-S5') du dispositif de chauffe (10), si le dispositif de chauffe (10) doit continuer de chauffer ou s'arrêter, et pour introduire une phase d'évaporation ([t5, t6]; S9) du dispositif de chauffe (10), pendant laquelle le bac d'évaporation (9) est chauffé au-delà de la température la plus élevée mesurée dans la phase de mesure, uniquement lorsque la modification (T1-T0) est inférieure à une première valeur limite (dTmin).
EP12780139.7A 2011-10-18 2012-10-11 Appareil de froid à bac d'évaporation et dispositif de chauffe favorisant l'évaporation Active EP2769155B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110084718 DE102011084718A1 (de) 2011-10-18 2011-10-18 Kältegerät mit Verdunstungsschale und Heizeinrichtung zur Verdunstungsförderung
PCT/EP2012/070198 WO2013057039A2 (fr) 2011-10-18 2012-10-11 Appareil de froid à bac d'évaporation et dispositif de chauffe favorisant l'évaporation

Publications (2)

Publication Number Publication Date
EP2769155A2 true EP2769155A2 (fr) 2014-08-27
EP2769155B1 EP2769155B1 (fr) 2016-03-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12780139.7A Active EP2769155B1 (fr) 2011-10-18 2012-10-11 Appareil de froid à bac d'évaporation et dispositif de chauffe favorisant l'évaporation

Country Status (4)

Country Link
EP (1) EP2769155B1 (fr)
CN (1) CN103890510B (fr)
DE (1) DE102011084718A1 (fr)
WO (1) WO2013057039A2 (fr)

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Publication number Priority date Publication date Assignee Title
DE102012221295A1 (de) * 2012-11-21 2014-05-22 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit einem Kühlfach
DE102013212893A1 (de) * 2013-07-02 2015-01-08 Robert Bosch Gmbh Verfahren zu einem Betreiben einer Wärmepumpe
ES2604003B1 (es) * 2015-09-02 2017-12-12 Bsh Electrodomésticos España, S.A. Aparato refrigerador doméstico con una cubeta receptora específica para el agua de descongelación
CN114264113A (zh) * 2017-06-15 2022-04-01 合肥华凌股份有限公司 冰箱及其控制方法、装置及计算机可读存储介质
CN110001361B (zh) * 2019-04-28 2020-12-11 泉州台商投资区五逸季科技有限公司 一种用于汽车空调的自带外循环水强冷的冷凝器
IT202100032828A1 (it) * 2021-12-28 2023-06-28 Irca Spa Vaschetta di evaporazione per acqua di condensa di frigorifero

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JP3695849B2 (ja) * 1996-05-30 2005-09-14 三洋電機株式会社 冷却貯蔵庫
DE10208558A1 (de) * 2002-02-27 2003-09-04 Vasilios Zigaris Verdunstungswanne
DE102004012498A1 (de) * 2004-03-15 2005-10-06 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät
JP2009085473A (ja) 2007-09-28 2009-04-23 Sanyo Electric Co Ltd 低温貯蔵庫
CN201355107Y (zh) * 2009-01-14 2009-12-02 北京上佳蓝基制冷设备有限公司 一种用于制冷空调设备的蒸发水盘

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Also Published As

Publication number Publication date
DE102011084718A1 (de) 2013-04-18
WO2013057039A3 (fr) 2013-08-08
WO2013057039A2 (fr) 2013-04-25
CN103890510A (zh) 2014-06-25
CN103890510B (zh) 2016-12-07
EP2769155B1 (fr) 2016-03-09

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