WO2009109909A2 - Système frigorifique - Google Patents

Système frigorifique Download PDF

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Publication number
WO2009109909A2
WO2009109909A2 PCT/IB2009/050850 IB2009050850W WO2009109909A2 WO 2009109909 A2 WO2009109909 A2 WO 2009109909A2 IB 2009050850 W IB2009050850 W IB 2009050850W WO 2009109909 A2 WO2009109909 A2 WO 2009109909A2
Authority
WO
WIPO (PCT)
Prior art keywords
air
evaporator
displacement arrangement
refrigeration system
gauge
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/IB2009/050850
Other languages
English (en)
Other versions
WO2009109909A3 (fr
Inventor
George Sjoerd Mazereeuw
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2009109909A2 publication Critical patent/WO2009109909A2/fr
Publication of WO2009109909A3 publication Critical patent/WO2009109909A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • 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
    • F25B2700/17—Speeds
    • F25B2700/172—Speeds of the condenser fan
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
    • 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
    • F25D2317/06—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 with forced air circulation
    • F25D2317/068—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 with forced air circulation characterised by the fans
    • F25D2317/0681—Details thereof
    • 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
    • F25D2317/06—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 with forced air circulation
    • F25D2317/068—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 with forced air circulation characterised by the fans
    • F25D2317/0684—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 with forced air circulation characterised by the fans the fans allowing rotation in reverse direction
    • 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
    • F25D2600/00—Control issues
    • F25D2600/02—Timing
    • 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

Definitions

  • THIS invention relates to a refrigeration system.
  • a cooling system which comprises an evaporator, a condenser and a compressor.
  • a refrigerant is vapourised inside the evaporator, thereby causing heat to be absorbed from the cooling chamber of the refrigerator.
  • the temperature inside the cooling chamber will drop.
  • the refrigerant is fed to the condenser where the gas is condensed to a liquid, whereafter it is fed to the compressor and then back to the evaporator.
  • the temperature inside the cooling chamber can be reduced to a desired level.
  • a beverage cooler in order to ensure that their beverages are stored inside a refrigerator at a favourable temperature, producers of beverages often specify certain parameters for refrigerating their products.
  • One well known soft drink producer for example specifies that from a stabilised position of 32 0 C and within a period of 19 hours of refrigeration, the warmest beverage can in a refrigerator should not be warmer than 7°C while the coldest beverage can should not be colder than O 0 C. Also, the average temperature of all the beverage cans should not exceed 3.2°C.
  • the average temperature of the evaporator of a beverage cooler is in the region of -10°C to -12°C causing air leaving the evaporator to be below 0°C.
  • the beverage bottle or can located nearest the "air off 1 point of the evaporator will be the coldest container in the cooler, whereas the bottle or can nearest the "air on” position of the evaporator will be the warmest container. Also, during a refrigeration cycle the "air off' temperature will commence at a relatively high temperature and will gradually become colder as the refrigeration cycle progresses.
  • a refrigeration system including an evaporator for evaporating a refrigerant, an air displacement arrangement for causing air to be displaced across the evaporator and a control system for adjusting the volume of air and/or the direction in which air is caused to be moved across the evaporator by the air displacement arrangement.
  • the air displacement arrangement is switchable between a first configuration in which air can be caused to move across the evaporator in a first direction and a second configuration in which air can be caused to move in an opposite, second direction across the evaporator.
  • the preferred refrigeration system includes at least one gauge in communication with the control system, the control system being arranged to adjust the air volume and/or air movement direction in response to measurements taken by the gauge.
  • the refrigeration system includes two gauges, the first gauge being in the form of a thermometer for measuring the air off temperature of the evaporator and the second gauge being in the form of a timer.
  • the control system may be arranged to cause the air displacement arrangement to switch from its first configuration to its second configuration in response to measurements taken by the timer.
  • the air displacement arrangement comprises a fan having variable pitch fan blades.
  • the refrigeration system includes a door sensor for detecting when a door of a refrigerator incorporating the refrigeration system is open and the control system is arranged for the air displacement arrangement to cause no air flow to take place when the door sensor detects that the door is open.
  • the refrigeration system of the invention comprises a condenser and a condenser fan with variabale pitch blades for moving a variable flow of air across the condenser, the condenser fan operating under the control of the control system.
  • a method of refrigerating a space including the steps of:
  • the preferred method includes the step of periodically switching the air displacement arrangement between a first configuration in which air is caused to move across the evaporator in a first direction and a second configuration in which air is caused to move across the evaporator in an opposite, second direction.
  • a gauge in the form of a timer, the method including switching the air displacement arrangement between the respective configurations in response to the timer.
  • the method includes the step of providing a gauge in the form of a temperature sensor and controlling the volume of air displaced across the evaporator by the air displacement arrangement in response to an air off temperature of the evaporator measured by the temperature sensor.
  • the preferred air displacement arrangement is a fan with variable pitch blades and the method includes the step of varying the pitch of the blades in order to control the volume of air displaced across the evaporator.
  • the method includes the steps of providing a door sensor for detecting when a door closing the refrigerated space is open and of causing the air displacement arrangement to cause no air flow to take place when the door sensor detects that the door is open.
  • the method may also include the steps of providing a condenser in a refrigeration circuit which also includes the evaporator, providing a condenser fan with variable pitch blades for moving a variable flow of air across the condenser, and controlling the operation of the condenser fan by means of the control system.
  • the method can be used to refrigerate a refrigeration space in a beverage cooler, but the invention is not limited to this application.
  • the drawing diagrammatically illustrates a beverage refrigerator or cooler 10 incorporating a refrigeration system in accordance with the present invention, generally indicated with the reference numeral 12.
  • the refrigerator 10 comprises a body 14 which defines a refrigerator space in the form of a cooling chamber 16 in which beverage bottles and/or cans can be cooled.
  • the beverage refrigerator 10 includes a number of shelves 17 on which the beverage containers can be placed. Access to the cooling chamber 16 can be gained through a glass door 18.
  • the beverage refrigerator 10 includes an evaporator 20, in this embodiment provided in the form of a coil evaporator, wherein a refrigerant will be caused to be vapourised by extracting heat from the cooling chamber 16, thereby leading to a temperature reduction inside the cooling chamber 16.
  • a condenser 22 From the evaporator 20 the gaseous refrigerant is fed to a condenser 22 wherein heat is extracted and it is allowed to condense to a liquid whereafter it is fed to a compressor 24 and then returned to the evaporator 20 via a capillary tube, not shown, which ensures that the refrigerant enters the evaporator 20 as a vapour.
  • a condenser fan 26 is provided for drawing air across the condenser 22.
  • a condenser grill or filter 29 is provided in order to deter dust and other unwanted particles from being drawn into the condenser 22 .
  • a tray 28 is provided inside the space holding the condenser 22 and the compressor 24.
  • the beverage refrigerator 10 is provided with a back panel 30 which is spaced apart from a rear wall 32 of the refrigerator to define a flow path 34.
  • cooled air is caused to move away from the evaporator 20 under the influence of an air displacement arrangement 36, here provided in the form of a fan, at the so called “air off' position 38. From the evaporator 20 the cooled air will move downwardly across the shelves 17 inside the cooling chamber 16 until it reaches the "air on" position 40 at the bottom of the cooling chamber 16. Finally the air passes under the influence of the air displacement arrangement 36 upwardly along the flow path 34 where it will again be caused to move across the evaporator 20 to be cooled. This cycle is indicated with solid arrows 42.
  • the refrigeration system 10 of the invention differs from conventional refrigeration systems inter alia in that it includes a control system 44 for adjusting the volume of air and/or the direction at which the air displacement arrangement 36 can cause air to be moved across the evaporator 20.
  • the air displacement arrangement is provided in the form of a fan having pitch-adjustable fan blades as described in a copending international patent application entitled “Fan”, filed simultaneously with the present application by the present applicant and .J-
  • the fan comprises a plurality of fan blades which are secured about a drive shaft which is to be driven by an electric motor.
  • the fan blades are pivotally secured inside a fan blade support such that they can be pivoted or rotated about generally radial axes between first and second positions, i.e. the pitch of the fan blades is adjustable.
  • the fan further includes an actuator which is mounted about the drive shaft and is connected to the fan blades. In use axial movement of the actuator causes the fan blades to move, i.e. rotate or pivot about generally radial axes, between their respective first and second positions.
  • the fan also includes an adjustor which is connected to the actuator. The adjustor in turn is connected to a stepper motor. The stepper motor further is in communication with the control system 44.
  • the stepper motor will be activated by the control system 44, such activation causing the adjustor to move from a first adjustor position to a second adjustor position.
  • Such movement of the adjustor causes the actuator to move axially relative to the drive shaft, as a consequence rotating the fan blades from their first positions to their second positions, thereby altering the blade pitch and accordingly the volume of air displaced per unit time by the air displacement arrangement 36.
  • the control system 44 operates, in response to the output of gauges or sensors 46 and 48, in order to adjust the volume of air and/or direction in which air is caused to move across the evaporator 20 by the air displacement arrangement 36.
  • the first gauge is a temperature sensor or thermometer 46 which is positioned in the cooling chamber 16 to measure the air off temperature of the evaporator 20.
  • the second gauge is a timer.
  • the present invention seeks to address this problem by providing a refrigeration system wherein the volume of air which can be displaced by the air displacement arrangement 36, i.e. evaporator fan, can be adjusted in response to measurements taken by the thermometer 46.
  • the control system 44 will cause the air displacement arrangement 36 to increase the volume of air which is caused to move across the evaporator 20, thereby compensating for the loss in available heat present in the air displaced.
  • the condenser fan 26 may also be a fan of the kind described in the aforementioned, international patent application, so that the volume of air which is caused to be displaced across the condenser by the fan per unit time can also be controlled by the control system 44.
  • the control system 44 By varying the air flow across the condenser at different stages during the refrigeration operation and in response to varying conditions in the refrigerated space, for example the temperature measured therein by the thermometer 46, it is possible to keep the condenser in a clean state leading, it is believed, to enhanced refrigeration efficiency and performance.
  • the beverage refrigerator or cooler 10 also includes a door sensor 50 which is also in communication with the control system 44.
  • the control system 44 is programmed such that when the door sensor 50 detects that the door 18 of the beverage refrigerator 10 has been opened, the air displacement arrangement 36 is switched to a neutral setting. In this setting of the arrangement 36 no air flow takes place, thereby avoiding a situation that warm, external, ambient air is drawn into the beverage refrigerator 10 through the open door.
  • the control system 44 is arranged such that once the timer 48 has measured a specific lapse of time, typically of the order of 10 minutes, it switches the air displacement arrangement 36 from its first configuration, as described above, to a second configuration in which the air is caused to move in an opposite direction indicated by broken arrows 52. This may for instance be achieved by reversing the direction of rotation of the motor driving the air displacement arrangement, i.e. the fan 36. It will be appreciated that the air off position 38 now becomes the air on position, while the air on position 40 becomes the air off position. Upon the expiration of a further time lapse, again typically of the order of 10 minutes, the air displacement arrangement 36 is switched back to the first configuration.
  • This cycle in which the air flow direction is periodically reversed, may be repeated until the thermostat of the refrigerator, not shown, causes the refrigeration system to become dormant.
  • the temperatures at the top and bottom shelves should in theory be the coldest, with the middle shelves being the warmest. Tests have, however, shown that the system leads to minimal, if any, temperature differentials between the different shelves 17 of the beverage refrigerator 10.
  • the refrigeration system described ensures that the temperature across the cooling chamber of a refrigerator remains substantially constant. Furthermore, the refrigeration system of the invention will ensure that the evaporator always operates at a positive temperature which will increase the efficiency of the refrigerator, with no beverage container adjacent the evaporator freezing up due to the fact that the temperature of the air off from the evaporator will not drop below zero.
  • the control system may also be arranged to switch the condenser fan 26 periodically so that the air flow direction across the condenser is periodically reversed. It is perceived that this feature will assist in ensuring that the condenser is maintained in a clean condition contributing to a high level of condenser efficiency.

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)
  • Air Conditioning Control Device (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

L'invention concerne un système frigorifique (12) comprenant un évaporateur (20) destiné à évaporer un agent réfrigérant et un dispositif (36) de déplacement d'air destiné à amener de l'air à se déplacer à travers l'évaporateur. Le système comprend également un système (44) de commande destiné à régler le volume d'air et / ou la direction dans laquelle on provoque le déplacement d'air à travers l'évaporateur au moyen du dispositif de déplacement d'air. Le volume d'air et / ou la direction dans laquelle on provoque le déplacement d'air à travers l'évaporateur est / sont commandés par le système de commande en réaction à des mesures relevées par une jauge telle qu'un thermomètre (46) destiné à mesurer la température de l'évaporateur sans circulation d'air et un temporisateur (48). Le dispositif de déplacement d'air se présente typiquement sous la forme d'un ventilateur muni de pales de ventilateur à pas réglable. Cela permet de régler le pas des pales du ventilateur afin de modifier le volume d'air et / ou la direction de l'écoulement d'air.
PCT/IB2009/050850 2008-03-03 2009-03-03 Système frigorifique Ceased WO2009109909A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200801996 2008-03-03
ZA2008/01996 2008-03-03

Publications (2)

Publication Number Publication Date
WO2009109909A2 true WO2009109909A2 (fr) 2009-09-11
WO2009109909A3 WO2009109909A3 (fr) 2009-11-26

Family

ID=41056412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050850 Ceased WO2009109909A2 (fr) 2008-03-03 2009-03-03 Système frigorifique

Country Status (1)

Country Link
WO (1) WO2009109909A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011104093A3 (fr) * 2010-02-26 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil de froid
DE102023114265A1 (de) 2023-05-31 2024-12-05 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369632A (en) * 1979-12-07 1983-01-25 Tyler Refrigeration Corporation Refrigerated merchandiser display case
KR940002220B1 (ko) * 1991-09-12 1994-03-19 주식회사 금성사 냉장고의 온도제어방법
JP2000130913A (ja) * 1998-10-28 2000-05-12 Toshiba Corp 冷蔵庫
US6725680B1 (en) * 2002-03-22 2004-04-27 Whirlpool Corporation Multi-compartment refrigerator control algorithm for variable speed evaporator fan motor
US6745581B2 (en) * 2002-09-16 2004-06-08 The Coca-Cola Company Systems and methods for temperature control in refrigeration systems and heating systems
DE102005037850A1 (de) * 2005-05-25 2006-11-30 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011104093A3 (fr) * 2010-02-26 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil de froid
CN102770729A (zh) * 2010-02-26 2012-11-07 Bsh博世和西门子家用电器有限公司 制冷器具
CN102770729B (zh) * 2010-02-26 2016-08-17 Bsh家用电器有限公司 制冷器具
DE102023114265A1 (de) 2023-05-31 2024-12-05 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät

Also Published As

Publication number Publication date
WO2009109909A3 (fr) 2009-11-26

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