EP2172725A1 - Réfrigérateur doté d'un contrôle optimisé de la conservation des aliments - Google Patents

Réfrigérateur doté d'un contrôle optimisé de la conservation des aliments Download PDF

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Publication number
EP2172725A1
EP2172725A1 EP08165845A EP08165845A EP2172725A1 EP 2172725 A1 EP2172725 A1 EP 2172725A1 EP 08165845 A EP08165845 A EP 08165845A EP 08165845 A EP08165845 A EP 08165845A EP 2172725 A1 EP2172725 A1 EP 2172725A1
Authority
EP
European Patent Office
Prior art keywords
cell
temperature
speed
refrigerator
food
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Withdrawn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
EP08165845A
Other languages
German (de)
English (en)
Inventor
Lorenzo Bianchi
Carolina Biotti
Enrica Monticelli
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.)
Whirlpool Corp
Original Assignee
Whirlpool Corp
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 Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP08165845A priority Critical patent/EP2172725A1/fr
Publication of EP2172725A1 publication Critical patent/EP2172725A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0252—Compressor control by controlling speed with two speeds
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/112—Fan speed control of evaporator fans
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0413—Treating air flowing to refrigeration compartments by purification by humidification
    • F25D2317/04131—Control means therefor
    • 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
    • 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
    • F25D2700/12—Sensors measuring the inside temperature

Definitions

  • Object of the present invention is a refrigerator provided with improved food preservation capabilities and an improved food preservation method thereof.
  • Parameters on the right side of the equation have direct impact in reducing the weigh of the food, and therefore prejudicing the food quality during preservation process.
  • Known refrigerators do not preserve the food with preservation capabilities such as preventing an excessive weight loss, being not capable to control and regulate the parameters affecting the weight loss phenomena described in the equation.
  • a method thereof for preventing an excessive weight loss of the food stored into a cavity cooled with cold air forced by means of a motorized fan is not disclosed in the art a method thereof for preventing an excessive weight loss of the food stored into a cavity cooled with cold air forced by means of a motorized fan.
  • the present invention is related to a fridge or similar that regulates temperature and humidity and that further controls the air inlet temperature and the speed of the same air to achieve improved food preservation results compared with existing refrigerators.
  • m that is the mass transfer coefficient
  • Ps and Pm respectively the vapor pressure on and above the food surface
  • a refrigerator which includes a first temperature sensor B placed into a fridge cell or compartment 1, a second temperature sensor C measuring, in direct contact or not, the temperature of the evaporator (not shown) connected, in a refrigerant circuit, to a variable speed compressor (not shown).
  • a relative humidity sensor D is also placed into the fridge cell or compartment together with a third temperature sensor E measuring the temperature at the air inlet Kin the fridge cell, said air forced into the cell with a motorized fan (not shown) rotating at a controlled speed.
  • the control method applicable to regulate the refrigerator is a main control algorithm that accomplishes four tasks, following described and associated with an execution priority, that are executable according to any possible sequence or repetition of the same tasks, or executed in a more sophisticated combining algorithm such as a PID (Proportional, Integral, Derivative) algorithm, a multi loop predictive algorithm, a neural network or a fuzzy algorithm.
  • the main control algorithm can also include a portion algorithm comprising a sequential execution of the task/s and another portion comprising a more sophisticated algorithm which executes more tasks at the same time.
  • This first task of the control algorithm concerns the fridge temperature control, which is the main aim that a control for refrigerators has to satisfy. It has the highest priority in the general routines execution.
  • a variable speed compressor is used to regulate the temperature of the fridge cell or compartment FRIDGE TEMP to a preset value SET TEMP.
  • a PID control is used to regulate the compressor in a closed loop with the fridge temperature sensor B, so that the speed of the compressor is adjusted in order to reach the required fridge temperature.
  • Other more sophisticated algorithms can be applied to define the optimal speed at which the compressor motor has to be driven. A time defrost operation is performed as well.
  • a second task of the control algorithm concerns the control of the relative humidity R.H. allowing a better food preservation of the food articles in dependence on the food category (e.g. vegetables, meat and so on).
  • This control feature is performed, for instance, by including a relative humidity sensor D into a closed loop control with the compressor, in which the operational parameters of the compressor such as the speed, the"on working time, and the"off"pausing time are regulated.
  • the relative humidity R.H. level is monitored through the R.H. sensor D so that it doesn't fall outside the optimal set R.H. range, which depends on the food contained into the compartment to which the control is applied.
  • the optimal R.H. range could be set at between 90% and 95% for the compartment in which vegetables are stored, while a range between 70% - 80% can be set for compartments wherein meat is stored.
  • Humidity level can be adjusted by activating the compressor in on/off working mode. No humidity control is possible as long as the compressor runs continuously at the same speed.
  • R.H level decreases.
  • R.H. level increases, and it increases even more if the fridge fan motor is running.
  • on and off times are adjusted, to regulate the R.H. level. For instance, whenever a de-humidifying operation is needed, the compressor is driven at low speed and consequently "on" time becomes longer and air is dried out. Differently, if a higher humidity level is needed, compressor runs at higher speed and "on” time becomes shorter and fridge fan motor is kept running during the "off"-times.
  • control algorithm optimizes the temperature measured by a third temperature sensor E of the air at the inlet K of the compartment by setting the proper compressor speed in relationship with the compartment conditions, for instance the temperature measured by the first temperature sensor B, and therefore controlling the temperature of the evaporator, which is measured with the second temperature sensor C, that cools the air entering at the inlet of the compartment.
  • the temperature of the air entering the compartment must be optimized in dependence of the temperature of the same compartment, which is linked with the temperature of the food stored into the same compartment, in order to prevent freezing bums, especially on vegetables and fruits.
  • the gap between the two temperatures must be lower than a predetermined amount DELTA MAX2, which is a really critical parameter for food preservation because freezing bums can otherwise occur, especially when air inlet temperature is much colder more than the cell temperature.
  • This predetermined temperature difference DELTA MAX2 is an acceptable value that avoids freezing damages which depend on the type of food stored, and which can be varied according to the type of food contained in the cell.
  • control operates for instance in closed loop with the third temperature sensor E, keeping the difference between temperature read by first temperature sensor B and the third temperature sensor E below the maximum difference DELTA MAX2 allowable. Whenever the difference exceeds the maximum difference DELTA MAX2 value, the control reduces the compressor speed until temperature difference is again within the allowed range.
  • control algorithm continuously establishes and sets the optimal speed for the motorized fan on the basis of the actual operating conditions.
  • the optimal speed is the best compromise between two opposite needs: from one side the need to keep the air speed as slow as possible to minimize food weight losses, and from the other side the need of increasing the air speed to cool down the fridge cell in a shorter time, especially when food at ambient temperature is introduced.
  • the motorized fan can be run at least at two fan speeds: the maximum speed MAX SPEED which depends on the fan motor requirements, and the minimum optimized speed MIN SPEED that reduces the food weight losses keeping the cell refrigerated.
  • the minimum optimized speed MIN SPEED could correspond to the minimum settable speed, or to the speed calculated on the basis of measured parameters, such as the cell temperature, read by the first temperature sensor B, or by the third temperature sensor E, or by a combination the two signals read.
  • the air speed control decides whenever the motorized fan is active, and at which speed it has to be run.
  • the defined speed value is used for driving the motor fan at the requested speed.
  • Other more sophisticated algorithms can be applied to define the optimal speed at which the motorized fan has to be run.
  • a fridge and a method capable to adjust temperature and humidity in addition to the air inlet temperature and the speed of the same air have been disclosed, to achieve improved food preservation results compared with existing refrigerators.

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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)
EP08165845A 2008-10-03 2008-10-03 Réfrigérateur doté d'un contrôle optimisé de la conservation des aliments Withdrawn EP2172725A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08165845A EP2172725A1 (fr) 2008-10-03 2008-10-03 Réfrigérateur doté d'un contrôle optimisé de la conservation des aliments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08165845A EP2172725A1 (fr) 2008-10-03 2008-10-03 Réfrigérateur doté d'un contrôle optimisé de la conservation des aliments

Publications (1)

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EP2172725A1 true EP2172725A1 (fr) 2010-04-07

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2447651A1 (fr) * 2010-10-27 2012-05-02 Whirlpool Corporation Appareil de réfrigération doté de contrôle de l'humidité et procédé de contrôle d'un tel appareil
CN103868303A (zh) * 2012-12-11 2014-06-18 东部大宇电子株式会社 具有防止和/或控制结露装置的冰箱及防止在冰箱中和/或上结露的方法
WO2015049303A1 (fr) * 2013-10-02 2015-04-09 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique à entretien du processus de maturation des marchandises réfrigérées, notamment de la viande
GB2530327A (en) * 2014-09-22 2016-03-23 42 Technology Ltd Heat transfer apparatus
WO2016192949A1 (fr) * 2015-06-02 2016-12-08 BSH Hausgeräte GmbH Appareil frigorifique comportant un compresseur frigorifique
WO2022142421A1 (fr) * 2020-12-30 2022-07-07 青岛海尔智能技术研发有限公司 Réfrigérateur et procédé pour la gestion du vieillissement d'aliments
EP4160122A1 (fr) * 2021-10-04 2023-04-05 Whirlpool Corporation Procédé de commande de condensation sur un appareil de réfrigération et réfrigérateur associé
CN117469925A (zh) * 2023-12-28 2024-01-30 珠海格力电器股份有限公司 应用于保鲜冰箱的肉品熟成方法、电子设备及存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609988A (en) 1970-05-25 1971-10-05 Gen Motors Corp Side-by-side refrigerator freezer with high humidity compartment
EP0592004A1 (fr) * 1992-10-09 1994-04-13 Daewoo Electronics Co., Ltd Réfrigérateur
US6694754B1 (en) * 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
EP1935293A2 (fr) * 2006-10-26 2008-06-25 Hussmann Corporation Présentoir réfrigéré
EP1959215A2 (fr) * 2007-02-16 2008-08-20 Whirlpool Corporation Procédé pour le contrôle de l'humidité dans un réfrigérateur domestique, et réfrigérateur adapté pour réaliser un tel procédé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609988A (en) 1970-05-25 1971-10-05 Gen Motors Corp Side-by-side refrigerator freezer with high humidity compartment
EP0592004A1 (fr) * 1992-10-09 1994-04-13 Daewoo Electronics Co., Ltd Réfrigérateur
US6694754B1 (en) * 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
EP1935293A2 (fr) * 2006-10-26 2008-06-25 Hussmann Corporation Présentoir réfrigéré
EP1959215A2 (fr) * 2007-02-16 2008-08-20 Whirlpool Corporation Procédé pour le contrôle de l'humidité dans un réfrigérateur domestique, et réfrigérateur adapté pour réaliser un tel procédé

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2447651A1 (fr) * 2010-10-27 2012-05-02 Whirlpool Corporation Appareil de réfrigération doté de contrôle de l'humidité et procédé de contrôle d'un tel appareil
CN103868303A (zh) * 2012-12-11 2014-06-18 东部大宇电子株式会社 具有防止和/或控制结露装置的冰箱及防止在冰箱中和/或上结露的方法
US10524484B2 (en) 2013-10-02 2020-01-07 Bsh Hausgeraete Gmbh Refrigeration appliance which supports the curing process of refrigerated goods, in particular of meat
WO2015049303A1 (fr) * 2013-10-02 2015-04-09 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique à entretien du processus de maturation des marchandises réfrigérées, notamment de la viande
WO2015049302A1 (fr) * 2013-10-02 2015-04-09 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique à entretien du processus de maturation des marchandises réfrigérées, notamment de la viande
CN105593621A (zh) * 2013-10-02 2016-05-18 Bsh家用电器有限公司 支持对被冷却的物品、尤其是肉的熟成加工的制冷器具
CN105723169A (zh) * 2013-10-02 2016-06-29 Bsh家用电器有限公司 支持对被冷却的物品、尤其是肉的熟成加工的制冷器具
US20160242427A1 (en) * 2013-10-02 2016-08-25 BSH Hausgeräte GmbH Refrigeration appliance which supports the curing process of refrigerated goods, in particular of meat
CN105723169B (zh) * 2013-10-02 2018-07-27 Bsh家用电器有限公司 支持对被冷却的物品、尤其是肉的熟成加工的制冷器具
CN105593621B (zh) * 2013-10-02 2018-09-07 Bsh家用电器有限公司 支持对被冷却的物品、尤其是肉的熟成加工的制冷器具
GB2530327A (en) * 2014-09-22 2016-03-23 42 Technology Ltd Heat transfer apparatus
WO2016192949A1 (fr) * 2015-06-02 2016-12-08 BSH Hausgeräte GmbH Appareil frigorifique comportant un compresseur frigorifique
WO2022142421A1 (fr) * 2020-12-30 2022-07-07 青岛海尔智能技术研发有限公司 Réfrigérateur et procédé pour la gestion du vieillissement d'aliments
EP4160122A1 (fr) * 2021-10-04 2023-04-05 Whirlpool Corporation Procédé de commande de condensation sur un appareil de réfrigération et réfrigérateur associé
US20230105421A1 (en) * 2021-10-04 2023-04-06 Whirlpool Corporation Refrigerator with anti-condensation features
CN117469925A (zh) * 2023-12-28 2024-01-30 珠海格力电器股份有限公司 应用于保鲜冰箱的肉品熟成方法、电子设备及存储介质
CN117469925B (zh) * 2023-12-28 2024-04-05 珠海格力电器股份有限公司 应用于保鲜冰箱的肉品熟成方法、电子设备及存储介质

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