EP4122359B1 - Kühlschranksystem - Google Patents

Kühlschranksystem

Info

Publication number
EP4122359B1
EP4122359B1 EP22185787.3A EP22185787A EP4122359B1 EP 4122359 B1 EP4122359 B1 EP 4122359B1 EP 22185787 A EP22185787 A EP 22185787A EP 4122359 B1 EP4122359 B1 EP 4122359B1
Authority
EP
European Patent Office
Prior art keywords
refrigerated
control unit
logic control
sensor
basis
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.)
Active
Application number
EP22185787.3A
Other languages
English (en)
French (fr)
Other versions
EP4122359A1 (de
EP4122359C0 (de
Inventor
Paolo ZENATTO
Marco MIATTON
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.)
De Rigo Refrigeration SRL
Original Assignee
De Rigo Refrigeration SRL
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 De Rigo Refrigeration SRL filed Critical De Rigo Refrigeration SRL
Publication of EP4122359A1 publication Critical patent/EP4122359A1/de
Application granted granted Critical
Publication of EP4122359B1 publication Critical patent/EP4122359B1/de
Publication of EP4122359C0 publication Critical patent/EP4122359C0/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/027—Condenser control arrangements
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
    • F25D19/04—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with more than one refrigeration unit
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/06—Several compression cycles arranged in parallel
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/22—Refrigeration systems for supermarkets
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2600/01—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
    • 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
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/14—Refrigerator multi units
    • 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
    • F25D2500/00—Problems to be solved
    • F25D2500/04—Calculation of parameters
    • 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
    • F25D2500/00—Problems to be solved
    • F25D2500/06—Stock management
    • 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
    • F25D27/00—Lighting arrangements
    • F25D27/005—Lighting arrangements combined with control means
    • 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
    • F25D2700/04—Sensors detecting the presence of a person
    • 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
    • F25D2700/06—Sensors detecting the presence of a product
    • 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
    • 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
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer
    • 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
    • F25D2700/16—Sensors measuring the temperature of products

Definitions

  • the present invention regards a refrigerator system according to the independent claim 1.
  • the present refrigerator system is advantageously intended to be employed within stores, supermarkets or other business premises for the display and sales of perishable foods and otherwise, and in particular it is advantageously intended to be employed in all those contexts where it is necessary to optimize the operation of a plurality of refrigerated displays.
  • the present refrigerator system is therefore inserted in the industrial field of production of refrigerating systems, e.g. for food products, and in particular in the field of production of cooling systems for the small, medium and large-scale retail channels.
  • the refrigerator systems are employed in supermarkets, food stores and in general in all those business premises which display foods that require maintenance at a controlled temperature.
  • the refrigerator systems comprise multiple refrigerated displays, and each of which comprises at least one evaporator and one refrigerated chamber, susceptible of containing products to be preserved in order to allow the display of foods at a controlled temperature, so as to maintain unchanged over time the characteristics of the displayed food product.
  • the aforesaid refrigerated displays are usually provided with at least one internal temperature sensor, in order to control the internal temperature of the corresponding refrigerated display, ensuring the preservation of the foods within the temperature interval specific for that specific food.
  • the refrigerator systems also comprise a refrigeration station, which is usually placed outside the business premises, in particular in the event in which the business premises are provided with a plurality of refrigerated displays.
  • the refrigeration station is connected to the refrigerated displays and comprises one or more compressors arranged for cooling a cooling fluid.
  • the refrigerator systems of known type comprise a refrigeration circuit, selectively placed to connect between the compressor and the evaporators, and at least one logic control unit, connected to the compressor in order to cool a corresponding refrigerated display for a predetermined cooling time period.
  • the logic control unit is connected to the temperature sensors and to the compressor in order to enable and disable the latter to feed with the cooling fluid a corresponding refrigerated display on the basis of the internal temperature detected by the corresponding temperature sensor.
  • the present refrigerator systems provide for setting multiple operating temperature intervals, within which the refrigerated displays must be maintained, and which depend on the foods preserved therein, and a maximum threshold temperature, also known as hysteresis temperature, which defines the temperature at which the logic control unit enables the compressor to cool a specific refrigerated display in order to prevent that it is excessively heated.
  • a maximum threshold temperature also known as hysteresis temperature
  • control is presently carried out by means of a temperature sensor, which is mounted on each refrigerated display and which communicates the detected temperatures to the logic control unit which in turn, in an independent manner for each refrigerated display, enables or disables the cooling of the refrigerated displays, for example by closing and opening solenoid valves placed to intercept the cooling circuit between refrigeration unit and refrigerated displays.
  • each refrigerated display is always cooled upon reaching the maximum threshold temperature (hysteresis) thereof up to a preset objective temperature thereof, therefore defining an operating cycle (for cooling and turning off) that is constant and independent of other operative parameters.
  • the main drawback lies in the fact that such solution involves high energy consumption, and consequently high costs for the operation of the refrigerator system.
  • such control method provides that the logic control unit drives each cooling unit on the basis of independent signals arriving from the various internal temperature sensors. This ensures that the compressors are continuously subjected to turning on and off operations, even close to each other, in order to meet the needs of the various refrigerated displays.
  • the turning on (or pickup) of each compressor significantly affects the energy consumptions, and therefore also the cost to be sustained by the owner of the business premises, since a compressor in turning-on step absorbs a quantity of energy that is much greater than that necessary for its normal operation.
  • a further drawback lies in the fact that, still due to the repeated operations of turning on and off the compressors, such method negatively affects the wear of the electronic and mechanical components of the compressors themselves.
  • a further drawback lies in the fact that, due to the high absorptions from the operations of turning on and off the compressors, the business premises must be equipped with an electrical system suitably for meeting such absorptions, thus it must provide for very heavy components that allow avoiding black-out when multiple compressors are turned on simultaneously.
  • a further drawback lies in the fact that, in particular in case of limit situations, such as for example a high number of people suddenly within the premises, a frequent opening/closing of the refrigerated display, high external temperatures and/or humidity etc., the refrigerator system of known type is not able to ensure the constant and precise maintenance of the internal temperature of each refrigerated display within the aforesaid operating interval.
  • the patent JP H11175832 describes a multi-column drink dispenser, provided with two refrigerated columns and three heated columns, and such dispenser is provided with a contact sensor placed on the door and adapted to communicate the open or closed state to a control unit so as to turn off the operation of the air circulation fan when the door is open for the supply operations.
  • the control unit implements a predictive logic which allows adapting the operation of the cooling means, being based on the historical record of the sales of products in the preceding days and hours.
  • a cooled drink dispenser which is provided with a contact sensor and with a movement sensor adapted to detect the open and closed state of the business premises in which it is installed, so as to allow the dispenser to pass from a normal operating mode to an energy saving mode when the business premises is closed and the sensors do not detect activity.
  • the patent WO 2013172936 describes a refrigerator system for containers containing multiple refrigerated cargos.
  • Such system comprises multiple surface temperature sensors, adapted to detect the surface temperature of each cargo such that the logic control unit can drive the cooling means on the basis of the actual thermal requirements of the various cargos.
  • a refrigerator system comprising multiple refrigerated displays and an air cooling unit, which is adapted to deliver a flow of cooled air towards the refrigerated displays in order to cool them and reduce the heat exchange between these and the outside environment.
  • Document US 2012059522 discloses a known system for controlling a cooling machine, which comprises a cooling circuit provided with a compressor, and a logic control unit configured to drive the compressor in order to control the refrigeration inside the cooling machine.
  • the cooling machine further comprises multiple sensors, which detect corresponding operating parameters and send corresponding signals to the logic control unit that, on the basis of these signals, calculate an optimal daily schedule time of the compressor.
  • Document EP 2224195 describes a refrigeration system comprising a centralized monitor unit which is connected to multiple cooling storages. Each cooling storage is provided with a refrigeration circuit and a CPU which drives the refrigeration circuit on the basis of the instructions sent by the monitor unit. In particular, the latter is provided with a storage device where data about a normal-mode and an eco-mode for the cooling storages are stored.
  • EP2251623B1 Further relevant prior art document is EP2251623B1 .
  • the problem underlying the present invention is therefore that of overcoming the drawbacks manifested by the above-described solution of known type, by providing a refrigerator system, which allows optimizing the operation of the refrigeration station, and in particular of the compressor.
  • a further object of the present finding is to provide a refrigerator system, which allows reducing the operations of turning on and off the compressor.
  • a further object of the present finding is to provide a refrigerator system, which allows reducing the energy consumption of the business premises in which it is installed.
  • a further object of the present finding is to provide a refrigerator system, which allows an energy savings.
  • a further object of the present finding is to provide a refrigerator system, which allows reducing the wear of the cooling unit.
  • a further object of the present finding is to provide a refrigerator system, which allows maintaining the internal temperature of the refrigerated displays within a preset operating interval, also in the case of limit situations.
  • a further object of the present finding is to provide a refrigerator system, which allows reducing the maximum power absorbed by the system.
  • the refrigerator system 1 according to claim 1 is advantageously employable in business premises, preferably large-size, in which a plurality of refrigerated displays 3 are necessary in order to contain different types of foods to be preserved and in which it is therefore necessary to optimize the operation thereof.
  • the refrigerator system 1 comprises at least one refrigeration station 2, provided with at least one compressor 21.
  • the refrigeration station 2 also comprises a condenser, at least one thermal expansion valve and other members necessary for attaining a cooling cycle, which are well known to a man skilled in the art and for this reason not described in detail hereinbelow.
  • the refrigerator system 1 also comprises a plurality of refrigerated displays 3, and each of which comprises at least one evaporator 31 and a refrigerated chamber 32, susceptible of containing products to be preserved.
  • each refrigerated display 3 comprises at least one technical space, within which the evaporator 31 is placed, which is in fluid communication with the refrigerated chamber 32 and can be placed above or below the refrigerated chamber 32.
  • each refrigerated display 3 comprises ventilation means, placed within the technical space and arranged for forcing a cooled air flow from the evaporator 31 to flow within the refrigerated chamber 32 in order to cool the products contained therein.
  • each refrigerated display 3 comprises a containment structure provided with a lower base intended to be abutted against the ground.
  • the containment structure delimits, at its interior, the aforesaid refrigerated chamber 32 and the technical space, separated from each other by at least one dividing wall, advantageously provided with aeration openings adapted to allow the passage of the air flow generated by the ventilation means.
  • One or more of the refrigerated displays 3 are placed in a position remote from the refrigeration station 2 (in which the compressor 21 is present).
  • the refrigerated displays 3 are intended to be positioned at different points of a premises or of a building (e.g. in the different sections of a supermarket), while the refrigeration station 2 is intended to be placed in a suitable premises set for the climate-control systems.
  • the refrigerator system 1 also comprises a refrigeration circuit 4, within which a cooling fluid is susceptible of flowing and which selective connects the at least one compressor 21 to the evaporators 31 of the plurality of refrigerated displays 3 by means of connection means.
  • the refrigeration circuit 4 advantageously comprises a main section, from which multiple secondary sections are extended branched, each of which hydraulically connected to an evaporator 31 of a corresponding refrigerated display 3 in order to cool it.
  • connection means comprise multiple enabling members, each of which placed to intercept a secondary section of the refrigeration circuit 4 in order to enable the passage of the cooling fluid and cool the corresponding refrigerated display 3.
  • enabling members comprise a valve, such as for example a solenoid valve.
  • the refrigerator system 1 comprises at least one logic control unit 5, connected to the at least one compressor 21 in order to actuate the cooling fluid to circulate in the refrigeration circuit 4, feeding at least one of the evaporators 31 in order to cool a corresponding refrigerated display 3 of the plurality of refrigerated displays 3 for a predetermined cooling time period.
  • each refrigerated display 3 is intended, during use, to be maintained within a corresponding preset temperature interval, which depends on the foods that the same refrigerated display 3 is intended to contain.
  • the preset temperature interval (for example in accordance with the UNI EN ISO 23953-2 2016 standard) is comprised between +7°C and -1°C.
  • the calculation unit 51 of the logic control unit 5 is configured for calculating an opening frequency of the door on the basis of the opening signal and calculating the additional time at least on the basis of the opening frequency.
  • the logic control unit 5 is configured for comparing the opening frequency of the door with a first threshold frequency, preferably comprised between 10 and 30 and, if the calculated opening frequency of the door exceeds the aforesaid first threshold frequency, it sets an additional time, preferably comprised between 60 and 300 seconds to the preset cooling time.
  • the logic control unit 5 is configured for driving the ventilation means, and in particular preferably for reducing a quantity of moved air in order to reduce the thermal exchange between the refrigerated chamber 32 and the outside environment, at least on the basis of the detected opening signal.
  • the logic control unit 5 is configured for disabling the ventilation means on the basis of the detected opening signal.
  • the logic control unit 5 is configured for comparing the number of clients with a threshold number, and if the number of clients calculated exceeds the aforesaid threshold number, it sets an additional time, preferably comprised between 60 and 300 seconds to the preset cooling time.
  • the threshold number of clients is advantageously strictly correlated to the size of the business premises in which the refrigerator system 1, object of the present invention, is situated.
  • At least one sensor of the plurality of sensors 6 is a temperature sensor 62, placed within the refrigerated chamber 32 of one of the plurality of refrigerated displays 3, arranged for detecting multiple measurements of internal temperature of the refrigerated display 3 and sending, to the logic control unit 5, multiple internal temperature signals of the plurality of signals corresponding to the measurements of internal temperature.
  • the calculation unit 51 of the logic control unit 5 is advantageously configured for calculating a thermal variation speed at least on the basis of the internal temperature signals and calculating the additional time at least on the basis of the thermal variation speed.
  • the logic control unit 5 is configured for comparing the thermal variation speed with a threshold speed, preferably comprised between 0.5°C/min and 1.5°C/min and, if the calculated thermal variation speed exceeds the aforesaid threshold speed, it sets an additional time, preferably comprised between 60 and 300 seconds to the preset cooling time.
  • At least one sensor of the plurality of sensors 6 is a movement sensor 64 (movement detector), preferably a photocell, mounted on one of the plurality of refrigerated displays 3 and configured for detecting a movement, e.g. correlated to the extraction of a product preserved in said refrigerated chamber 32, and sending, to the logic control unit 5, a movement signal of the plurality of signals corresponding to the detected movement.
  • the movement sensor 64 is an infrared sensor.
  • the calculation unit 51 of the logic control unit 5 is advantageously configured for calculating a frequency of extraction of products on the basis of the movement signal and calculating the additional time at least on the basis of the extraction frequency. More in detail, with the expression "extraction frequency" it is intended the number of movements detected in a specific time interval, which is preferably 300 seconds.
  • the logic control unit 5 is configured for comparing the extraction frequency with a second threshold frequency, preferably comprised between 10 and 30 and, if the calculated number of clients exceeds the aforesaid threshold frequency, it sets an additional time, preferably comprised between 60 and 300 to the preset cooling time.
  • the logic control unit 5 is advantageously configured for driving the ventilation means, and in particular preferably for reducing a quantity of moved air in order to reduce the thermal exchange between the refrigerated chamber 32 and the outside environment, at least on the basis of the detected movement signal.
  • the logic control unit 5 is configured for disabling the ventilation means on the basis of the detected movement signal.
  • At least one sensor of the plurality of sensors 6 is a volumetric sensor 65 (e.g. infrared or microwave), mounted on a corresponding refrigerated display 3 of the plurality and arranged for detecting a fill state of the refrigerated display 3 and sending, to the logic control unit 5, a fill signal of the plurality of signals corresponding to the detected fill state.
  • the calculation unit 51 of the logic control unit 5 is advantageously configured for calculating the additional time at least on the basis of the aforesaid fill signal.
  • At least one sensor of the plurality of sensors 6 is a thermal camera 66, mounted on a corresponding refrigerated display 3 of the plurality and arranged for detecting a surface temperature of at least one product preserved within the refrigerated chamber 32 and sending, to the logic control unit 5, a surface temperature signal of the plurality of signals corresponding to the detected surface temperature.
  • the calculation unit 51 of the logic control unit 5 is advantageously configured for calculating the additional time at least on the basis of the aforesaid surface temperature signal.
  • the logic control unit 5 is configured for comparing the surface temperature with a threshold surface temperature, and if the measured surface temperature exceeds the aforesaid threshold surface temperature by a value preferably comprised between 0.5°C and 1.5°C, it sets an additional time, preferably comprised between 60 and 300 seconds to the preset cooling time.
  • At least one sensor of the plurality of sensors 6 is an external humidity sensor and at least one sensor of the plurality of sensors 6 is an external temperature sensor 62, arranged for respectively measuring a value of humidity outside the refrigerated displays 3 and of temperature outside the refrigerated displays 3 and sending, to the logic control unit 5, an external humidity signal and an external temperature signal of the plurality of signals corresponding respectively to the measured external humidity and to the measured external temperature.
  • the calculation unit 51 of the logic control unit 5 is advantageously configured for calculating the additional time at least on the basis of the aforesaid external humidity and external temperature signals.
  • the logic control unit 5 is configured for comparing the external humidity and the external temperature respectively measured with a threshold humidity and with a threshold temperature, preferably respectively comprised between 40 % and 80 % and between 16 °C and 40 °C, if at least one between the measured external humidity and measured external temperature exceeds the corresponding threshold value, it sets an additional time, preferably comprised between 60 and 300 seconds to the preset cooling time.
  • threshold temperature and humidity intervals advantageously depend on the climate class of the refrigerated display 3, in accordance with the UNI EN ISO 23953-2 2016 standard.
  • calculation unit 51 is configured for combining multiple values arriving from the sensors 6 and calculating an additional time on the basis of the aforesaid values.
  • the calculation unit 51 is configured for attributing a corresponding ponderal coefficient to each signal received by the sensors 6 and for calculating a total additional time on the basis of the aforesaid ponderal coefficients.
  • the refrigerator system 1 comprises illumination means, associated with a refrigerated display 3 of the plurality of refrigerated displays 3 and arranged for illuminating the refrigerated chamber 32 of the corresponding refrigerated display 3, and at least one twilight sensor, arranged for detecting a quantity of light within a premises in which the plurality of refrigerated displays 3 is placed and sending a brightness signal corresponding to the detected light quantity to the logic control unit 5.
  • the refrigerator system 1 also advantageously comprises at least one proximity sensor, arranged for detecting a movement, preferably corresponding to the approach of a person to the refrigerated display 3 and sending a proximity signal corresponding to the detected person to the logic control unit 5.
  • the logic control unit 5 is configured for driving the illumination means to illuminate the refrigerated chamber 32 of the plurality of refrigerated displays 3 at least on the basis of the brightness signal and on the basis of the proximity signals.
  • the logic control unit 5 comprises at least one archiving unit, configured for receiving the plurality of signals and archiving the corresponding operative parameters detected by the plurality of sensors 6 according to at least one historical parameter selected from among: the measurement time range and the day of the week of the measurement.
  • the logic control unit 5 is configured for driving the actuation of the refrigeration station 2 on the basis of the operative parameters archived in the archiving unit, in order to maintain substantially constant the internal temperature of the refrigerated displays 3.
  • the refrigerator system 1 thus conceived therefore attains the pre-established objects.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Claims (9)

  1. Kühlschranksystem, umfassend:
    - mindestens eine Kühlstation (2), die mit mindestens einem Kompressor (21) ausgestattet ist;
    - eine Vielzahl von Kühlvitrinen (3), von denen mindestens eine in einer von der genannten Kühlstation (2) entfernten Position angeordnet ist und jede dieser Kühlvitrinen (3) mindestens einen Verdampfer (31) und eine Kühlkammer (32) umfasst, die geeignet ist, zu konservierende Produkte zu enthalten, und mindestens eine der genannten Vielzahl von Kühlvitrinen (3) mindestens eine Tür umfasst, die so angeordnet ist, dass sie die genannte Kühlkammer (32) schließt, um sie von der Außenumgebung zu isolieren; wobei jede Kühlvitrine (3) dazu bestimmt ist, bei Gebrauch, innerhalb eines entsprechenden voreingestellten Temperaturbereichs gehalten zu werden, das von den Produkten abhängt, die die genannte Kühlvitrine (3) enthalten soll;
    - einen Kühlkreislauf (4), in dem eine Kühlflüssigkeit zu fließen geeignet ist, der wahlweise den genannten mindestens einen Kompressor (21) mit den Verdampfern (31) der genannten Vielzahl von Kühlvitrinen (3) mittels Verbindungsmitteln verbindet;
    - mindestens eine logische Steuereinheit (5), die an den genannten Kompressor (21) angeschlossen ist, um die genannte Kühlflüssigkeit in dem genannten Kühlkreislauf (4) in Umlauf zu bringen und mindestens einen der genannten Verdampfer (31) zu speisen, um eine entsprechende Kühlvitrine (3) der genannten Vielzahl von Kühlvitrinen (3) für eine vorgegebene Kühlzeit zu kühlen; wobei die vorgegebene Kühlzeit die Zeit ist, die erforderlich ist, um die entsprechende Kühlvitrine (3) von einer maximalen Schwellentemperatur, die frei von möglichen thermischen Hysterese-Deltas ist, auf eine Zieltemperatur zu bringen, die innerhalb des genannten Temperaturintervalls enthalten ist; wobei die genannte maximale Schwellentemperatur die Temperatur definiert, bei der die genannte logische Steuereinheit (5) den genannten Kompressor (21) aktiviert, um die genannte Kühlvitrine (3) zu kühlen;
    - zwei oder mehr Sensoren (6), die darauf ausgelegt sind, entsprechende Betriebsparameter zu erfassen und eine Vielzahl von Signalen an die genannte logische Steuereinheit (5) zu senden, die den genannten Betriebsparametern entsprechen; wobei die genannten Sensoren (6) Folgendes umfassen:
    - einen Kontaktsensor (61), der an der genannten Tür angebracht und darauf ausgelegt ist, einen Öffnungs-/Schließzustand der genannten Tür zu erfassen und ein Öffnungssignal der genannten Vielzahl von Signalen, das dem genannten Öffnungs-/Schließzustand entspricht, an die genannte logische Steuereinheit (5) zu senden; und
    - mindestens einen Sensor unter: einem Temperatursensor (62), einem Feuchtigkeitssensor (63), einem Bewegungssensor (64), der darauf ausgelegt ist, eine Bewegung innerhalb der Kühlkammer (32) der genannten Kühlvitrine (3) zu erfassen, einem Volumensensor (65), der eingerichtet ist, um einen Füllzustand der genannten Kühlvitrine (3) zu erfassen, einer Wärmebildkamera (66), einem Personenzählsensor (67);
    wobei die genannte logische Steuereinheit (5) in Datenkommunikation mit der genannten Vielzahl von Sensoren (6) steht, um die Signale von den genannten Sensoren (6) zu empfangen;
    wobei das genannte Kühlsystem (1) dadurch gekennzeichnet ist, dass die genannte logische Steuereinheit (5) mindestens eine Berechnungseinheit (51) umfasst, die darauf ausgelegt ist, auf Grundlage der genannten Signale eine zusätzliche Umlaufzeit der genannten Kühlflüssigkeit über die genannte Kühlzeit hinaus zu berechnen; wobei die genannte logische Steuereinheit (5) darauf ausgelegt ist, die genannte vorgegebene Kühlzeit um die genannte zusätzliche Zeit zu verlängern;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, eine Öffnungsfrequenz der genannten Tür auf Grundlage des genannten Öffnungssignals zu berechnen und die genannte zusätzliche Zeit mindestens auf Grundlage der genannten Öffnungsfrequenz zu berechnen.
  2. Kühlschranksystem nach Anspruch 1, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Personenzählsensor (67) ist, der darauf ausgelegt ist, eine Anzahl von Kunden in einer Räumlichkeit zu erfassen, in der sich die genannte Vielzahl von Kühlvitrinen (3) befindet, und darauf ausgelegt ist, an die genannte logische Steuereinheit (5) ein Zählsignal der genannten Vielzahl von Signalen zu senden, das der genannten Anzahl von erfassten Kunden entspricht;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, die genannte zusätzliche Zeit mindestens auf Grundlage des genannten Zählsignals zu berechnen.
  3. Kühlschranksystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Temperatursensor (62) ist, der in der Kühlkammer (32) einer der genannten Vielzahl von Kühlvitrinen (3) platziert und eingerichtet ist, um mehrere Messungen der Innentemperatur der genannten Kühlvitrine (3) zu erfassen und mehrere Signale der genannten Vielzahl von Signalen, die den genannten Messungen der Innentemperatur entsprechen, an die genannte logische Steuereinheit (5) zu senden;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, eine Temperaturänderungsgeschwindigkeit mindestens auf Grundlage der genannten Signale der gemessenen Innentemperatur zu berechnen und die genannte zusätzliche Zeit mindestens auf Grundlage der genannten Temperaturänderungsgeschwindigkeit zu berechnen.
  4. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Bewegungssensor (64) ist, der an einer der genannten Vielzahl von Kühlvitrinen (3) angebracht und darauf ausgelegt ist, eine Bewegung in der genannten Kühlkammer (32) zu erfassen und ein Bewegungssignal der genannten Vielzahl von Signalen, das der genannten erfassten Bewegung entspricht, an die genannte logische Steuereinheit (5) zu senden;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, eine Entnahmefrequenz der Produkte auf Grundlage des genannten Bewegungssignals zu berechnen, um die genannte zusätzliche Zeit mindestens auf Grundlage der genannten Entnahmefrequenz zu berechnen.
  5. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Volumensensor (65) ist, der an einer entsprechenden Kühlvitrine (3) der genannten Vielzahl von Kühlvitrinen angebracht und zum Erfassen eines Füllstands der genannten Kühlvitrine (3) und zum Senden eines Füllsignals der genannten Vielzahl von Signalen, das dem genannten erfassten Füllstand entspricht an die genannte logische Steuereinheit (5), eingerichtet ist;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, die genannte zusätzliche Zeit mindestens auf Grundlage des genannten Füllsignals zu berechnen.
  6. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) eine Wärmebildkamera (66) ist, die an einer entsprechenden Kühlvitrine (3) der genannten Vielzahl von Kühlvitrinen angebracht und zum Erfassen einer Oberflächentemperatur mindestens eines in der genannten Kühlkammer (32) konservierten Produkts und zum Senden eines Oberflächentemperatursignals der genannten Vielzahl von Signalen, das der genannten erfassten Oberflächentemperatur entspricht, an die genannte logische Steuereinheit (5), eingerichtet ist;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, die genannte zusätzliche Zeit mindestens auf Grundlage des genannten Oberflächentemperatursignals zu berechnen.
  7. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Außenfeuchtigkeitssensor und mindestens ein Sensor der genannten Vielzahl von Sensoren (6) ein Außentemperatursensor (62) ist, die dazu eingerichtet sind, jeweils einen Feuchtigkeitswert außerhalb der genannten Kühlvitrine (3) bzw. einen Temperaturwert außerhalb der genannten Kühlvitrine (3) zu messen und ein Außenfeuchtigkeitssignal und ein Außentemperatursignal der genannten Vielzahl von Signalen an die genannte logische Steuereinheit (5) zu senden, die jeweils der genannten gemessenen Außenfeuchtigkeit bzw. der genannten gemessenen Außentemperatur entsprechen;
    wobei die Berechnungseinheit (51) der genannten logischen Steuereinheit (5) darauf ausgelegt ist, die genannte zusätzliche Zeit mindestens auf Grundlage der genannten Außenfeuchtigkeits- und Außentemperatursignale zu berechnen.
  8. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass es Folgendes umfasst:
    - Beleuchtungsmittel, die mit einer Kühlvitrine (3) der genannten Vielzahl von Kühlvitrinen (3) verbunden und dazu eingerichtet sind, die Kühlkammer (32) der entsprechenden genannten Kühlvitrine (3) zu beleuchten, und
    - mindestens einen Dämmerungssensor, der dazu eingerichtet ist, eine Lichtmenge in einer Räumlichkeit zu erfassen, in der die genannte Vielzahl von Kühlvitrinen (3) positioniert ist, und ein der genannten erfassten Lichtmenge entsprechendes Helligkeitssignal an die genannte logische Steuereinheit (5) zu senden;
    - mindestens einen Näherungssensor, der dazu eingerichtet ist, zu erfassen, wenn sich eine Person der genannten Kühlvitrine (3) nähert, und der genannten logischen Steuereinheit (5) ein der genannten erfassten Person entsprechendes Näherungssignal zu übermitteln;
    wobei die genannte logische Steuereinheit (5) darauf ausgelegt, die genannten Beleuchtungsmittel anzusteuern, um die Kühlkammer (32) der entsprechenden Kühlvitrine (3) mindestens auf Grundlage des genannten Helligkeitssignals und auf Grundlage des genannten Näherungssignals zu beleuchten.
  9. Kühlschranksystem nach einem beliebigen der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die genannte logische Steuereinheit (5) mindestens eine Archivierungseinheit umfasst, die darauf ausgelegt ist, die genannte Vielzahl von Signalen zu empfangen und die entsprechenden Betriebsparameter, die von der genannten Vielzahl von Sensoren (6) erfasst werden, gemäß mindestens einem historischen Parameter zu archivieren, der ausgewählt wird unter: dem Messzeitbereich und dem Wochentag der Messung;
    wobei die genannte logische Steuereinheit (5) darauf ausgelegt ist, die Inbetriebnahme der genannten Kühlstation (2) auf Grundlage der in der genannten Archivierungseinheit archivierten Betriebsparameter zu steuern, um die Innentemperatur der genannten Kühlvitrinen (3) im Wesentlichen konstant zu halten.
EP22185787.3A 2021-07-19 2022-07-19 Kühlschranksystem Active EP4122359B1 (de)

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