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WO2018162273A1 - Dispositif de refroidissement - Google Patents

Dispositif de refroidissement Download PDF

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Publication number
WO2018162273A1
WO2018162273A1 PCT/EP2018/054735 EP2018054735W WO2018162273A1 WO 2018162273 A1 WO2018162273 A1 WO 2018162273A1 EP 2018054735 W EP2018054735 W EP 2018054735W WO 2018162273 A1 WO2018162273 A1 WO 2018162273A1
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
cooling device
light
frost
disposed
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/EP2018/054735
Other languages
English (en)
Inventor
Ezgi KUTLU
Taha AKGUN
Burak SAHIN
Cenk UYAR
Emre AKYILDIZ
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of WO2018162273A1 publication Critical patent/WO2018162273A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D27/00—Lighting arrangements

Definitions

  • the present invention relates to a cooling device with increased cooling efficiency.
  • frost on the evaporator adversely affects the cooling performance and decreases the energy efficiency of the cooling device.
  • Heaters are used to remove or prevent said frost on the evaporator. Said heaters consume energy to remove the frost and adversely affect the energy efficiency of the cooling device by increasing the ambient temperature. Said heaters do not operate depending on the frost formation or the thickness of the frost, but operate according to time or temperature values. Therefore, the heaters may operate early or late or more or less than needed.
  • the frost on the evaporator and the thickness thereof must be detected before operating the heater.
  • Various methods are used to detect the frost on the constantly-cooled evaporator and the thickness thereof.
  • frost In the method of detection of frost with light, one of the methods used for detecting the frost on the evaporator, light is sent onto the evaporator surface and if there is no frost, said light is reflected from the evaporator surface. The reflection is detected by light sensors and the light intensity is measured. In case of frost, the intensity of the light received by the light sensor decreases due to the light being absorbed by the ice and being reflected from the ice so as to scatter. Said value compared with the light intensity measured in case of the absence of frost is used to determine the amount of frost on the evaporator.
  • the main problem with this method is that the ice being white increases its reflectance and the use of white light in the determination of the frost thickness causes disadvantages.
  • frost cannot be linearly detected.
  • frost may form on the evaporator, thus decreasing the energy efficiency of the cooling device.
  • the heater may be operated more than required, similarly, decreasing the energy efficiency of the cooling device.
  • the aim of the present invention is to detect the frost on evaporators used in cooling devices.
  • At least one compartment wherein the foodstuffs to be cooled are placed is provided.
  • a receptacle separated by means of a plate-shaped panel from the compartment is provided in said compartment.
  • An evaporator is disposed in the receptacle, and by means of said evaporator the receptacle and the compartment are cooled, thus enabling the foodstuffs placed into the compartment to preserve their freshness for a long time.
  • a part of the outer surface of the evaporator is colored with a color determined by the producer and suitable for reflecting the light at a certain wavelength.
  • a light source is disposed so as to be aligned with the colored area.
  • Said light source is configured to emit light at the wavelength of the colored area and at a wavelength different from said wavelength.
  • the light source is disposed on a color sensor detecting the light reflected from the evaporator surface.
  • the light emitted by the light source first reaches the evaporator surface and is reflected from there depending on the wavelength of the color of the colored area or partially absorbed.
  • the reflected light reaches the color sensor and thus the reflectance of the light can be calculated.
  • the intensities of the light emitted and of the light received are compared by means of a control unit.
  • the ratio of the intensities of the light emitted and of the light received are compared with values predetermined by the producer.
  • the control unit decides whether there is frost on the evaporator surface.
  • the control unit is disposed on the electronic card.
  • the evaporator extends almost parallel to the panel.
  • the light source, the color sensor, the control unit and the electronic card are disposed on the panel, providing ease of production.
  • the light source is configured to emit light at the wavelengths of blue, green and red.
  • the intensity of the light reflected from the colored area on the evaporator differs.
  • the ratio therebetween is compared with the values predetermined by the producer and thus the amount of frost on the evaporator can be detected. Consequently, the defrosting operation is carried out in case of the presence of frost and according to the amount of frost, decreasing the energy consumption of the cooling device.
  • the light source has at least one photodiode.
  • said light is substantially reflected from or absorbed by the colored area of the evaporator.
  • frost all the wavelengths are reflected from the surface with frost at similar rates and thus the presence of frost can be detected.
  • the color sensor is disposed on the electronic card.
  • ease of assembly is provided and labor costs are decreased.
  • the light source is disposed on the electronic card.
  • ease of assembly is provided and labor costs are decreased.
  • the peak light absorption wavelength of the color sensor is between 655-665nm.
  • the range of 655-665nm among the lights at different wavelengths reflected from the evaporator to reach the color sensor is detected at the most.
  • selectivity against certain wavelengths is provided.
  • the peak light absorption wavelength of the color sensor which is 655-665nm matches with the wavelength of the color of the part of the evaporator colored by the producer, thus the frost can be precisely measured.
  • the peak light absorption wavelength of the color sensor is between 560-570nm.
  • the range of 560-570nm among the lights at different wavelengths reflected from the evaporator to reach the color sensor is detected at the most.
  • selectivity against certain wavelengths is provided.
  • the peak light absorption wavelength of the color sensor which is 560-570nm matches with the wavelength of the color of the part of the evaporator colored by the producer, thus the frost can be precisely measured.
  • the peak light absorption wavelength of the color sensor is between 425-435nm.
  • the range of 425-435nm among the lights at different wavelengths reflected from the evaporator to reach the color sensor is detected at the most.
  • selectivity against certain wavelengths is provided.
  • the peak light absorption wavelength of the color sensor which is 425-435nm matches with the wavelength of the color of the part of the evaporator colored by the producer, thus the frost can be precisely measured.
  • the frost on the evaporator that adversely affects the operational efficiency of the cooling device can be detected.
  • Figure 1 - is the sideways cross-sectional view of the cooling device.
  • Figure 2 - is the sideways view of the evaporator and the control card.
  • Figure 3 - is the rear view of the control card in front of the evaporator.
  • Figure 4 - is the front view of the control card.
  • the cooling device (1) of the present invention comprises
  • the cooling device (1) of the present invention comprises the evaporator (5) of which at least a part of the outer surface is colored with a color determined by the producer and suitable for reflecting the light at a certain wavelength; at least one light source (6) that is disposed so as to be aligned with the evaporator (5) and that is configured to emit light at the wavelength of the color of the evaporator (5) and at wavelengths different from the color of the evaporator (5); at least one color sensor (7) whereon the light source (6) is disposed, that is disposed in the compartment (2) and that detects the light reflected from the evaporator (5) surface, and an electronic card (9) having a control unit (8) that compares the values detected by the color sensor (7) with the values predetermined by the producer so as to decide whether there is frost on the evaporator (5).
  • the cooling device (1) of the present invention comprises the compartment (2) wherein the foodstuffs to be cooled are placed.
  • the receptacle (4) is produced so as to be adjacent to said compartment (2) in the cooling device (1) and is separated from the compartment (2) by means of the panel (3).
  • the evaporator (5) providing the cooling of the compartment (2) and hence the foodstuffs placed into the compartment (2) is disposed in the receptacle (4).
  • the temperature of the evaporator (5) drops below zero and thus, free water vapor thereon, in particular on the center thereof condenses so as to form frost.
  • a part of the evaporator (5) is colored with a color predetermined by the producer.
  • the light source (6) is disposed so as to be aligned with said colored area and is configured to emit light at the wavelength of the color of the colored area and at wavelengths different therefrom.
  • the light emitted by the light source (6) onto the evaporator (5) is reflected to return to the color sensor (7) disposed on the light source (6).
  • the color sensor (7) transmits the detected light intensity to the control unit (8) so as to be compared with the values predetermined by the producer.
  • the control unit (8) compares the received value with the predetermined values and decides whether there is frost on the evaporator (5).
  • the control unit (8) is disposed on the electronic card (9).
  • the cooling device (1) of the present invention comprises the evaporator (5) that extends almost parallel to the panel (3).
  • the panel (3) provides an area for positioning the light source (6) and the color sensor (7) to be aligned with the colored area of the evaporator (5), thus providing ease of assembly.
  • the cooling device (1) of the present invention comprises the light source (6) that emits light at the wavelengths of blue (450-495nm), green (495-570nm) and red (620-750nm). By emitting light at different wavelengths, the amount of frost can be measured. In case of absence of frost, the lights emitted by the light source (6) at the wavelengths of blue, green and red are reflected from the evaporator (5), and the intensity (I1) of the light with the wavelength closest to the wavelength of the color of the colored area is more than the other two light intensities (I2 and I3). Thus, the control unit (8) detects the color of the colored area.
  • the lights emitted by the light source (6) at the wavelengths of blue, green and red are reflected from the evaporator (5), and in this case, while the intensity (I4) of the light with the wavelength closest to the wavelength of the color of the colored area decreases, but is still more than the other two light intensities (I5 and I6) (I4>I5 and I4>I6).
  • the control unit (8) compares the values (I1 and I4) and if I1>I4, decides that the frosting has started on the evaporator (5).
  • the intensities of lights at the wavelengths of blue, green and red reflected in different cases are respectively compared with the values predetermined by the producer by means of the control unit (8) and thus information corresponding to the presence of frost and if any the thickness of the frost and the area covered by the frost is obtained.
  • the operational efficiency of the cooling device (1) is improved and the energy consumption is decreased.
  • the cooling device (1) of the present invention comprises the light source (6) having at least one photodiode.
  • the photodiodes emitting light at a wavelength similar to the wavelength of the color of the colored area of the evaporator (5), almost the entire light falling on the colored area is reflected and with the photodiodes emitting light at a different wavelength, almost the entire light falling on the colored area is absorbed.
  • the frost can be precisely measured and the operational efficiency of the cooling device (1) is improved and the energy consumption is decreased.
  • the cooling device (1) of the present invention comprises the electronic card (9) at the center of which the color sensor (7) is disposed. By disposing the color sensor (7) on the electronic card (9), ease of production and assembly is provided.
  • the cooling device (1) of the present invention comprises the electronic card (9) whereon the light source (6) is disposed.
  • the electronic card (9) By disposing the light source (6) on the electronic card (9), ease of production and assembly is provided.
  • the cooling device (1) of the present invention comprises the electronic card (9) having the color sensor (7) of which the peak light absorption wavelength is within the range of 655-665nm.
  • the color sensor (7) By means of the narrow light sensitivity range of the color sensor (7), the sensitivity thereof against lights at other wavelengths and thus, the lights at other wavelengths are prevented from causing interference in the control unit (8) during the measurement of the thickness of the frost and a precise measurement is provided.
  • the cooling device (1) of the present invention comprises the electronic card (9) having the color sensor (7) of which the peak light absorption wavelength is within the range of 560-570nm.
  • the color sensor (7) By means of the narrow light sensitivity range of the color sensor (7), the sensitivity thereof against lights at other wavelengths and thus, the lights at other wavelengths are prevented from causing interference in the control unit (8) during the measurement of the thickness of the frost and a precise measurement is provided.
  • the cooling device (1) of the present invention comprises the electronic card (9) having the color sensor (7) of which the peak light absorption wavelength is within the range of 425-435nm.
  • the color sensor (7) By means of the narrow light sensitivity range of the color sensor (7), the sensitivity thereof against lights at other wavelengths and thus, the lights at other wavelengths are prevented from causing interference in the control unit (8) during the measurement of the thickness of the frost and a precise measurement is provided.
  • the light source (6) in the cooling device (1) is configured to emit light at the wavelengths of 425-435nm, 560-570nm and 655-665nm.
  • the need for using more than one light source (6) is eliminated and the product costs are decreased.
  • the color sensor (7) in the cooling device (1) is configured to detect light at the wavelengths of 425-435nm, 560-570nm and 655-665nm.
  • the need for using more than one color sensor (7) is eliminated and the product costs are decreased.
  • the cooling devices (1) it is detected whether there is frost on the evaporator (5) during and after the cooling process, and if any, what the thickness of the frost is and how large the area covered by the frost is.

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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)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention porte sur un dispositif de refroidissement (1) qui comprend un compartiment (2) dans lequel sont placés des aliments que l'on souhaite refroidir, un réceptacle (4) qui est disposé dans le compartiment (2) et qui est séparé du compartiment (2) au moyen d'un panneau (3), un évaporateur (5) qui est disposé dans le réceptacle (4) et qui fournit le refroidissement du compartiment (2) ; au moins une source de lumière (6) qui est configurée pour émettre de la lumière à la longueur d'onde de la couleur de l'évaporateur (5) et à des longueurs d'onde différentes de la couleur de l'évaporateur (5) ; au moins un capteur de couleur (7), qui est disposé dans le compartiment (2) et qui détecte la lumière réfléchie par la surface d'évaporateur (5), et une carte électronique (9) ayant une unité de commande (8) qui compare les valeurs détectées par le capteur de couleur (7) avec les valeurs prédéterminées par le producteur de façon à décider s'il y a du givre sur l'évaporateur (5).
PCT/EP2018/054735 2017-03-07 2018-02-27 Dispositif de refroidissement Ceased WO2018162273A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2017/03450A TR201703450A2 (tr) 2017-03-07 2017-03-07 Bir Soğutucu
TR2017/03450 2017-03-07

Publications (1)

Publication Number Publication Date
WO2018162273A1 true WO2018162273A1 (fr) 2018-09-13

Family

ID=61569238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/054735 Ceased WO2018162273A1 (fr) 2017-03-07 2018-02-27 Dispositif de refroidissement

Country Status (2)

Country Link
TR (1) TR201703450A2 (fr)
WO (1) WO2018162273A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5828966A (ja) * 1981-08-13 1983-02-21 三菱電機株式会社 除霜制御装置
EP1620686A1 (fr) * 2003-05-03 2006-02-01 Dantherm Air Handling A/S Regulation de temperature au moyen d'une lumiere de mesure ultraviolette
JP2007271168A (ja) * 2006-03-31 2007-10-18 Mitsubishi Electric Corp 着霜検出装置およびデフロスト装置
US9328953B2 (en) 2010-02-23 2016-05-03 Lg Electronics Inc. Refrigerator and controlling method thereof
US9459038B1 (en) * 2015-03-04 2016-10-04 Robert Michael Read System for defrost termination

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5828966A (ja) * 1981-08-13 1983-02-21 三菱電機株式会社 除霜制御装置
EP1620686A1 (fr) * 2003-05-03 2006-02-01 Dantherm Air Handling A/S Regulation de temperature au moyen d'une lumiere de mesure ultraviolette
JP2007271168A (ja) * 2006-03-31 2007-10-18 Mitsubishi Electric Corp 着霜検出装置およびデフロスト装置
US9328953B2 (en) 2010-02-23 2016-05-03 Lg Electronics Inc. Refrigerator and controlling method thereof
US9459038B1 (en) * 2015-03-04 2016-10-04 Robert Michael Read System for defrost termination

Also Published As

Publication number Publication date
TR201703450A2 (tr) 2018-09-21

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