EP2607826A2 - Procédé destiné au fonctionnement dýun meuble frigorifique et meuble frigorifique - Google Patents

Procédé destiné au fonctionnement dýun meuble frigorifique et meuble frigorifique Download PDF

Info

Publication number
EP2607826A2
EP2607826A2 EP12199003.0A EP12199003A EP2607826A2 EP 2607826 A2 EP2607826 A2 EP 2607826A2 EP 12199003 A EP12199003 A EP 12199003A EP 2607826 A2 EP2607826 A2 EP 2607826A2
Authority
EP
European Patent Office
Prior art keywords
cooling
temperature
mode
condensation
period
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.)
Withdrawn
Application number
EP12199003.0A
Other languages
German (de)
English (en)
Other versions
EP2607826A3 (fr
Inventor
Horst Peter Dr. Wurm
Matthias Kordon
Gianluca di Lieto
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.)
Wurm & Co KG Elektronische Systeme GmbH
Original Assignee
Wurm & Co KG Elektronische Systeme 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 Wurm & Co KG Elektronische Systeme GmbH filed Critical Wurm & Co KG Elektronische Systeme GmbH
Publication of EP2607826A2 publication Critical patent/EP2607826A2/fr
Publication of EP2607826A3 publication Critical patent/EP2607826A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F25D29/00—Arrangement or mounting of control or safety 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/02—Humidity
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/02—Sensors detecting door opening
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Definitions

  • the invention relates to a method for operating a refrigerated cabinet for cooling refrigerated goods by means of cooled air, wherein the refrigerated cabinet comprises at least one refrigeration cycle with a heat exchanger for cooling the air, and wherein the method comprises operating the refrigerated cabinet in a cooling power control mode in which the refrigeration cycle according to an adjustable target cooling temperature is controlled.
  • the invention further relates to a corresponding refrigerator.
  • Food retail refrigerated cabinets must ensure the correct product temperature of each refrigerated foodstuff so that the foodstuffs are fresh and the best before dates stated on the packaging remain valid.
  • the stored in a cold room of the refrigerator food is surrounded with cooled air, which is cooled by means of the cooling circuit and is usually colder than the desired temperature of the food.
  • the cooling circuit is operated with a heat exchanger temperature (ie evaporator temperature) of about -7 ° C to -10 ° C, even if the refrigerated goods are to be cooled only in a positive temperature range.
  • a heat exchanger temperature ie evaporator temperature
  • Such cooling in which the temperature at the refrigerated goods, for example, + 7 ° C, is also referred to as normal or plus cooling.
  • the object is achieved by a method having the features of claim 1 and in particular by the fact that the refrigerated cabinet is automatically operated intermittently in a Kondensations memorismodus in which the cooling circuit briefly generates a higher cooling capacity than a cooling capacity control mode corresponding cooling capacity.
  • the object is further achieved by a refrigerator with the features of the independent device claim.
  • the condensation mode of operation In the condensation mode of operation, a lower temperature is achieved due to the increased cooling capacity at the heat exchanger than in the cooling capacity control mode. This leads to an increased condensation of the humidity contained in the cooling air at the heat exchanger. Depending on the cooling capacity, ice formation may even occur for a short time. Thus, the cooling air is effectively dehumidified, so that also the humidity level is lowered in the region of the goods to be cooled.
  • the condensation water condensed on the heat exchanger can be collected by means of a collecting device provided on the heat exchanger and optionally discharged or vaporized outside the refrigerated cabinet, so that the cooling air circulating in the refrigerated cabinet retains the reduced moisture level at least for a certain time.
  • the method according to the invention can be used in particular in an open or closed cooling rack in which the cooled air circulates in the form of a substantially vertical air flow, a so-called air curtain.
  • the automatic change between the condensation mode of operation and the cooling power control mode takes place without the intervention of a user, for example time-controlled or as a function of a humidity reading, which will be explained in more detail below.
  • cooling temperature and “desired cooling temperature” are not limited to a temperature prevailing near the refrigerated goods inside the refrigerator, but also to a temperature of a circulating in the cooling circuit cooling medium or to the temperature of the cooled Air in the area of the heat exchanger or at any other point in the air circuit, for example, an inlet or outlet of the cooled air in or out of the refrigerator, can relate.
  • the actual temperature at the refrigerated goods then results from the geometric conditions of the refrigerator.
  • a respective temperature sensor for determining an actual temperature can be provided at said positions within the refrigerated cabinet, on the basis of which the cooling capacity is regulated.
  • the method is used when the target cooling temperature (for the control of the cooling power in cooling power control mode) is higher than 0 ° C and / or if due to the operation of the cooling cabinet in the cooling power control mode, a temperature is set at the heat exchanger, which is at least temporarily higher than 0th ° C is.
  • the explained problem of too high humidity in the area of the chilled goods proves to be particularly serious. This is the case in particular in the case of the initially mentioned normal cooling or positive cooling.
  • the target cooling temperature relative to the heat exchanger may be approx. 0 ° C to + 1 ° C.
  • the desired cooling temperature may be, for example, about + 7 ° C.
  • the cooling circuit is controlled according to a reduced target cooling temperature in the condensation mode of operation, which is lower than the set target cooling temperature. Accordingly, not only in the cooling capacity control mode, but also in the condensation operation mode, a target cooling temperature is set to which the cooling power is controlled.
  • This reduced desired cooling temperature may be lower by at least 5 ° C (or 5 K as a temperature difference), preferably by at least 7 ° C (or 7 K), in particular by at least 10 ° C (or 10 K) Desired cooling temperature of the cooling capacity control mode. This ensures sufficient dehumidification of the cooling air.
  • the cooling cycle may be controlled according to a predetermined cooling performance.
  • a predetermined cooling performance for example, the maximum cooling capacity of the cooling circuit. Reaching the to Dehumidification necessary temperature difference is ensured by a corresponding design of the cooling circuit and a cooling circuit control.
  • the cooling circuit is controlled based on a comparison of an actual cooling temperature with the set target cooling temperature, the actual cooling temperature corresponding to a measured temperature of a cold side of the heat exchanger or a measured temperature of the cooled air or a combination thereof.
  • the temperature of the cooled air can be measured, for example, as mentioned, in the region of an air inlet opening and / or an air outlet opening of the cooling space of the cooling cabinet.
  • the higher cooling capacity in the condensation mode of operation is chosen such that, due to the operation of the refrigerator in the condensation mode, a temperature is set at the heat exchanger which is lower than 0 ° C. This reliably ensures, especially in contrast to the cooling power control mode, that the water contained in the cooled air freezes on the cold side of the heat exchanger in order to bring about the desired dehumidification.
  • the location of the heat exchanger in Kondensations results in the location of the heat exchanger in Kondensations.
  • Kondensations stipulatesmodus a temperature of the cooled air by at least 5 ° C (or 5 K), preferably by at least 7 ° C (or 7 K), in particular by at least 10th ° C (or 10 K), lower than in the cooling capacity control mode.
  • a sufficient reduction of the humidity in the cooled air is achieved.
  • the temperature of the cooled air in the condensation mode of operation is not higher than -7 ° C, in particular not higher than -10 ° C.
  • a particularly effective dehumidification is achieved.
  • the refrigerating cabinet is operated (in particular alternately) during a cooling operation period in the cooling power control mode and during a condensation operation period in the condensation operation mode, wherein the condensation operation period is shorter than the cooling operation period on the time average.
  • the refrigeration furniture is predominantly operated in the more energy-efficient cooling-power control mode, while the more energy-intensive condensation operating mode is activated only for a limited period of time. It is not excluded that in a particular case a condensation operating period is slightly longer than a preceding or subsequent cooling operation period.
  • the beginning and / or the duration of the condensation operation period and / or the beginning and / or the duration of the cooling operation period are fixed, i. There is a time control.
  • the condensation mode of operation may be activated four times or five times daily at fixed times (preferably at night).
  • the beginning and / or the duration of the condensing operating period in dependence on a time of day, a timeout, a measured value representing the humidity of the cooled air, a measured value representing the humidity of ambient air of the refrigerated cabinet, a measured value which is the temperature of the Heat exchanger represents, or the frequency and / or the duration of opening operations of a refrigerator cover of the refrigerator, or any combination thereof determined.
  • a measured value representing the humidity of the cooled air a measured value representing the humidity of ambient air of the refrigerated cabinet
  • a measured value which is the temperature of the Heat exchanger represents, or the frequency and / or the duration of opening operations of a refrigerator cover of the refrigerator, or any combination thereof determined.
  • it can be considered During business hours, there is more frequent access to the cold room and thus increased humidity in the environment than at night or on weekends.
  • the humidity of the cooled air and / or the ambient air of the refrigerator furniture can be considered. This allows a particularly needs-based implementation of the condensation.
  • the temperature of the heat exchanger or a corresponding measured value can also serve as a basis for determining the beginning and / or the duration of the condensation operating period. For example, as long as the temperature of the heat exchanger is below 0 ° C. because of the required cooling capacity and therefore the moisture in the cooled air freezes on the heat exchanger, the cooling cabinet can be operated in the cooling capacity control mode. Only when the temperature of the heat exchanger for a predetermined period of time or for a dependent on the temperature of the heat exchanger time is above 0 ° C, in this embodiment, the condensation mode is activated. As a result, a need-based implementation of the condensation is also ensured.
  • the mentioned measured value can be determined both directly via corresponding temperature sensors on the heat exchanger or indirectly via temperature sensors arranged remotely from the heat exchanger.
  • An indirect determination can be carried out when using an evaporator as a heat exchanger via a determination of a refrigerant pressure in the cooling circuit.
  • the determination of the frequency and / or the duration of the opening operations allows a needs-based control of the condensation mode of operation.
  • the regulation or control of the Refrigerated cabinets are designed so that four to five condensation operating periods per day are provided.
  • the refrigerator is temporarily operated in a defrost mode in which the temperature of the heat exchanger is increased from a temperature required for the operation of the refrigerator in the cooling capacity control mode.
  • a defrost mode in which the temperature of the heat exchanger is increased from a temperature required for the operation of the refrigerator in the cooling capacity control mode.
  • a temporary active heating of the heat exchanger can take place and / or the circulation of the air stream can be temporarily interrupted in the defrosting mode.
  • the defrost mode may be provided at least occasionally (i.e., only after some condensation periods), or the defrost mode is activated each time following the condensation mode of operation (i.e., after each condensation period of operation).
  • a control device of the refrigerated appliance may be coupled to a moisture measuring device for determining the air humidity of the cooled air, wherein the control device is further configured to operate the refrigeration appliance in the condensing operation mode when the determined humidity exceeds a predetermined first threshold.
  • control device is further configured to operate the refrigeration unit in the cooling capacity control mode if the determined humidity falls below a predetermined second threshold value and / or a predetermined period has elapsed after the beginning of a condensation operating period.
  • the initiation of the condensation mode of operation and optionally also the termination of the condensation mode of operation may be controlled via the humidity measuring device, wherein the two thresholds may be the same or different from one another for implementing some hysteresis.
  • the termination of the condensation operation mode can take place after a certain period of time has elapsed.
  • the condensation mode of operation is also changed over from the condensation operating mode to the cooling power control mode if the determined air humidity has not yet fallen below the predetermined second threshold value. This avoids that, for example, in operating conditions with a very high humidity of the ambient air or in very frequent opening operations of the cold room cover, the refrigerator is operated for an excessive length in the condensation mode, which would result in increased energy consumption.
  • the moisture measuring device is preferably arranged in the interior of the cooling space, for example on trays or on the floor, but may also be provided at any other point in the air flow of the cooled air. There may also be provided several humidity measuring devices.
  • Fig. 1 shows a schematic representation of a cooling cabinet according to the invention.
  • An inventive refrigerator 11 comprises a cooling chamber 12, in which a plurality of trays 21 are arranged for storage of refrigerated goods.
  • the refrigerator 12 may be open to the front or closed by means of a glass door 14 shown in dashed lines.
  • the refrigeration unit 11 further comprises a refrigeration cycle, which in a known manner comprises at least a compressor, a condenser and an evaporator, wherein in Fig. 1 only the evaporator 17 is shown.
  • the compressor and / or the condenser may be integrated in the refrigerated cabinet 11 or may be located separately from the refrigerated cabinet 11 at a remote location.
  • the control of the cooling circuit by means of a control device, not shown.
  • the evaporator 17 or a part of the evaporator acts as a heat exchanger for cooling an im Refrigerator 11 circulating air flow 13 of cooled air, the flow direction is indicated by the arrows.
  • the cooled air at the evaporator 17 enters the cooling space 12 via an air inlet 19 and out of the cooling space 12 via an air outlet 15, from where it returns to the evaporator 17.
  • the air stream 13 flowing in at the air inlet 19 heats up on its way through the cooling space 12 and mixes with warm and moist ambient air entering the cooling space 12, so that the moisture content of the air flow 13 increases over time.
  • the moisture contained in the air stream 13 condenses on the evaporator 17 and forms condensate or condensate.
  • the accumulating condensation water can be collected by means of a condensate collecting device 16 and discharged from the refrigeration unit 11.
  • a humidity sensor 23 is arranged, which measures the humidity of the flowing through the cooling chamber 12 air flow 13 and transmitted to the control device.
  • the refrigerator 11 may further include one or more temperature sensors (not shown) provided in the area of the air inlet 19, the air outlet 15 and / or the evaporator 17, the temperature of the air flow 13 and / or the temperature of a refrigerant circulating in the refrigeration cycle to be determined as the actual cooling temperature.
  • the refrigeration unit 11 is first operated in a cooling capacity control mode in which the refrigeration cycle is controlled according to a set target refrigeration temperature. For example, a refrigerated product temperature of + 7 ° C may be desirable, for which a desired cooling temperature at the location of the evaporator 17 is required, which is for example slightly more than 0 °.
  • the controller controls the cooling capacity of the refrigeration cycle based on the desired and actual temperatures.
  • the target cooling temperature at the location of the evaporator 17 is reduced to a value of, for example, -7 ° C.
  • the cooling circuit is operated with a correspondingly higher cooling capacity.
  • the condensation operation mode is terminated, and the controller returns to the cooling capacity control mode. Due to the increase in the target cooling temperature to more than 0 ° C, the formed on the evaporator 17 ice-thickened condensate thaw and the resulting condensation water can be removed by means of the dew water collecting device 16.
  • the cooling furniture 11 is operated in a defrost mode following the condensation operation mode and in particular before returning to the cooling power control mode.
  • this defrosting mode the temperature at the evaporator 17 is increased beyond an evaporator temperature provided in the cooling capacity control mode, for example, to about + 8 ° C to + 9 ° C, to accelerate the defrosting of the ice condensate and the discharge of the resulting condensed water.
  • the defrosting can take place, for example, by a temporary deactivation of the cooling circuit for switching off the cooling power and optionally by an additional heating of the evaporator 17.
  • the circulation of the air flow 13 can be interrupted in the defrost mode or maintained to accelerate the defrosting process, in the latter case, although a certain re-humidification of the cooling air takes place, which is negligible compared to the discharged amount of condensate.

Landscapes

  • 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)
EP12199003.0A 2011-12-23 2012-12-21 Procédé destiné au fonctionnement d'un meuble frigorifique et meuble frigorifique Withdrawn EP2607826A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011122198A DE102011122198A1 (de) 2011-12-23 2011-12-23 Verfahren zum Betreiben eines Kühlmöbels und Kühlmöbel

Publications (2)

Publication Number Publication Date
EP2607826A2 true EP2607826A2 (fr) 2013-06-26
EP2607826A3 EP2607826A3 (fr) 2018-01-31

Family

ID=47561205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12199003.0A Withdrawn EP2607826A3 (fr) 2011-12-23 2012-12-21 Procédé destiné au fonctionnement d'un meuble frigorifique et meuble frigorifique

Country Status (2)

Country Link
EP (1) EP2607826A3 (fr)
DE (1) DE102011122198A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474026A (en) * 1981-01-30 1984-10-02 Hitachi, Ltd. Refrigerating apparatus
ITVA20070020A1 (it) * 2007-02-16 2008-08-17 Whirlpool Co Metodo per regolare l'umidita' all'interno di un frigorifero e frigorifero adatto all'implementazione di tale metodo
NZ584547A (en) * 2007-10-09 2012-01-12 Panasonic Corp Refrigerator with atmoization unit producing a mist containing radicals where the temperature of the atomization tip is adjusted to be at or below the dew point
DE102009019361B4 (de) * 2009-02-23 2020-01-30 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
DE102011122198A1 (de) 2013-06-27
EP2607826A3 (fr) 2018-01-31

Similar Documents

Publication Publication Date Title
DE19581557C2 (de) Abtauverfahren für den Kältemittel-Kreislauf eines Kühlschranks
EP1636530B1 (fr) Refrigerateur a deshumidification commandee
DE102011079205A1 (de) Kältegerät und Verfahren zum Betreiben eines Verdichters
WO2015043898A1 (fr) Appareil de froid et machine de froid présentant un conduit de dérivation correspondant
WO2003054462A1 (fr) Dispositif refrigerant a deshumidification reglable
DE102007011114A1 (de) Kältegerät
WO2019166291A1 (fr) Réfrigérateur avec dispositif de dégivrage par chauffage
DE102009000665A1 (de) Kältegerät, insbesondere Haushaltskältegerät, sowie Verfahren zur Regelung eines Kältegeräts
DE102017221866A1 (de) Einkreis-Kältegerät
EP1350068B1 (fr) Procede pour reguler un appareil de refroidissement
EP2880384B1 (fr) Appareil frigorifique à dégivrage automatique et procédé de commande d'un tel appareil
WO2014023689A1 (fr) Appareil frigorifique et procédé permettant de faire fonctionner ledit appareil
WO2018069105A1 (fr) Appareil de froid doté d'une fonction de déshydratation et procédé pour faire fonctionner cet appareil
EP2607826A2 (fr) Procédé destiné au fonctionnement dýun meuble frigorifique et meuble frigorifique
WO2013007618A2 (fr) Appareil frigorifique sans givre et procédé de dégivrage d'un évaporateur
WO2017076586A1 (fr) Dispositif de réfrigération à compartiment flexible
DE102012206806A1 (de) Einkreis-Kältegerät und Betriebsverfahren dafür
DE102019118784A1 (de) Kühl- und/oder Gefriergerät
EP3745054B1 (fr) Appareil de refroidissement et/ou de congélation
DE102011078320B4 (de) Kältegerät mit Verdunstungsschale und Hilfseinrichtung zur Verdunstungsförderung
DE102011075002A1 (de) Überwachungsverfahren zur Überwachung eines Füllzustandes in einem Verdunstungsbehälter eines Kältegerätes, Verdunstungsverfahren, Verdunstungsvorrichtung sowie Kältegerät
DE102021100536A1 (de) Kühl- und/oder Gefriergerät mit variabler Luftfeuchtigkeit
DE102016220160A1 (de) Kältegerät mit Trockenfunktion
DE102020207894A1 (de) Verfahren zum Betreiben eines Haushalts-Kühlgeräts sowie Haushalts-Kühlgerät
WO2022037880A1 (fr) Procédé pour dégivrer un évaporateur d'un appareil de froid

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RIC1 Information provided on ipc code assigned before grant

Ipc: F25D 29/00 20060101AFI20171222BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180801