EP4338990A1 - Système de réfrigération monobloc amélioré et procédé de commande de paramètre associé - Google Patents

Système de réfrigération monobloc amélioré et procédé de commande de paramètre associé Download PDF

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Publication number
EP4338990A1
EP4338990A1 EP22197695.4A EP22197695A EP4338990A1 EP 4338990 A1 EP4338990 A1 EP 4338990A1 EP 22197695 A EP22197695 A EP 22197695A EP 4338990 A1 EP4338990 A1 EP 4338990A1
Authority
EP
European Patent Office
Prior art keywords
refrigeration system
evaporator
cold room
speed
temperature
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.)
Pending
Application number
EP22197695.4A
Other languages
German (de)
English (en)
Inventor
Lucio CARETTA
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.)
Sicaf Srl
Original Assignee
Sicaf 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 Sicaf Srl filed Critical Sicaf Srl
Publication of EP4338990A1 publication Critical patent/EP4338990A1/fr
Pending 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
    • 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
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic 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
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2700/2104—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
    • 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
    • F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator

Definitions

  • the present patent concerns compact refrigeration units, commonly referred to as monoblock refrigeration units, and more specifically it concerns a new improved monoblock refrigeration system and the related method for controlling the parameters of the monoblock system.
  • Monoblock refrigeration systems are applied in the cooling processes of cold rooms, which are used to store products at a desired temperature.
  • the word “monoblock” derives from the fact that the two main parts that make up the refrigeration cycle, that is, the condensation unit, located outside the environment to be cooled, and the evaporation unit, located inside the environment to be cooled, are directly connected to form a single block.
  • the installation of the monoblock refrigeration system in the cold room can be carried out by positioning the monoblock refrigeration system astride the thickness of the cold room side, in the so-called astride or "knapsack" configuration, or it can be carried out by making a hole in the wall of the cold room in such a way as to allow the evaporation unit to be inserted inside the cold room, leaving the condensation unit outside, in the so-called "buffer" configuration.
  • the conventional monoblock refrigeration systems currently available on the market are basically of two types, called positive temperature cold rooms and negative temperature cold rooms.
  • Positive temperature cold rooms can work at positive temperatures, generally included between -5 and +10 °C, and are suitable for storing food products such as meat, fish, fruit, vegetables and dairy products.
  • Negative temperature cold rooms are set for negative temperatures, generally included between -15 and -25 °C, and are used for storing frozen products.
  • Conventional monoblock refrigeration systems are usually equipped with an electronic instrument that makes it possible to set the temperature value desired for the cold room manually, said value being commonly referred to as the "set point".
  • the set point In the conventional monoblock refrigeration systems, however, it is not possible to adapt the performance according to the type of product to be preserved, and above all it is not possible to switch from the positive temperature to the negative temperature operating configuration.
  • a variation of the set point obviously results in a variation of the thermal load, that is, the difference between the actual temperature in the cold room and the set temperature.
  • the difference between the temperature inside the cold room and the evaporation temperature of the refrigerant is called ⁇ T and is expressed in Kelvin (K).
  • Relative humidity is a factor that can greatly affect the correct preservation of a food product.
  • the frosting of the evaporator reduces its heat exchange capacity, thus further reducing the efficiency of the machine.
  • Another fundamental parameter for the correct preservation of a product is the quantity of air with which that product comes into contact.
  • the air flow moved by the evaporator is always constant, which can cause damage to the more delicate products that instead need to come into contact with a gentler air flow.
  • the main object of the present invention is to provide a refrigeration system in which it is possible to control the ⁇ T value by means of an innovative combination of components.
  • the present patent concerns also the method for controlling the operating parameters of the monoblock refrigeration system, and in particular of the compressor, the evaporator fan and the expansion valve, in order to modulate the ⁇ T value as a function of the previously defined set point.
  • the new monoblock refrigeration system comprises a casing or containment unit which contains the parts described and claimed below, an evaporation unit and a condensation unit, both of which are enclosed in said casing, and wherein said casing is sized and configured to be installed in a cold room in such a way that said evaporation unit is located inside the cold room while said condensation unit is located outside the cold room.
  • the new monoblock refrigeration system also includes at least one compressor and at least one expansion valve.
  • the monoblock refrigeration system also includes an electronic control unit for controlling the operating parameters of said components.
  • the monoblock refrigeration system also includes a display, generically placed on said casing in a position where it can be accessed by a user, with an interface by means of which a user can select the operation program of the monoblock refrigeration system even remotely, according to the type of product to be stored inside the cold room.
  • said interface can and preferably should allow the user to select from at least five programs: fruit/vegetables, meat, fish, cold meats/cheese, frozen food products.
  • the interface can make it possible to select an additional "free" program, that is, a program that can be modified by the user.
  • said interface comprises buttons or a touch screen with 6 selectable boxes, one for each of the above-mentioned programs.
  • the boxes may be marked with one or more alphanumeric characters or with one or more graphic symbols, for example reproducing the type of product to be stored.
  • each program actually includes operating parameters for the monoblock refrigeration system. Therefore, each program first of all determines the set point value for the corresponding product, that is, the ideal temperature at which the product must be stored and which must be reached inside the cold room.
  • Each program determines also the ⁇ T value for the corresponding product as well as the speed of the evaporator fan, which is directly correlated to the air flow rate.
  • the applicant of the present patent has determined the optimal ⁇ T value for each product and in particular:
  • the applicant of the present patent has determined the optimal air flow rate value in the evaporator (m 3 /h) for each product and in particular:
  • the flow rate values specified above refer to a monoblock refrigeration system developed to provide a refrigerating capacity included between 1430W (meat program 0°C) and 610W (frozen products program -25°C).
  • the new monoblock refrigeration system is equipped with at least one variable speed compressor, controlled by means of an inverter capable of modulating the flow rate of the refrigerant to be compressed as the compressor speed varies, consequently varying the refrigerating capacity according to the thermal load actually required, that is, the difference between the set point temperature set by the program selected by the user and the actual temperature present in the cold room.
  • a conventional monoblock refrigeration system works with a non-optimized ⁇ T value and above all with a constant air flow rate in the evaporator. An excessive air flow rate can thus produce an excessive dehumidification effect, damaging the most sensitive products (for example, fruit and vegetables).
  • the new monoblock refrigeration system is also equipped with an electronic expansion unit, which is such as to make it possible to set the overheating of the refrigerant, always with the purpose of obtaining and maintaining the desired ⁇ T value, differently from what happens in the known monoblock refrigeration systems, where the thermostatic expansion valve is mechanical.
  • the new monoblock refrigeration system is also equipped with said condenser with variable speed electronic fan, controlled through the reading of a high-pressure probe that adjusts its speed according to the external temperature, wherein a high external temperature implies a high rotation speed and vice versa.
  • the method for controlling the parameters of the monoblock refrigeration system therefore comprises the following steps:
  • Figure 1 shows the refrigeration diagram as well as an evaporation unit (E) and a condensation unit (C) positioned astride a side (P) of a cold room in such a way that said evaporation unit (E) is located inside (I) the cold room while the condensation unit (C) is located outside (O) the cold room.
  • Figure 1 shows: an evaporator (1) with an electronic fan (11) with variable speed; a compressor (2) with an inverter (21), a condenser (3), an electronic expansion valve (4).

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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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP22197695.4A 2022-09-19 2022-09-26 Système de réfrigération monobloc amélioré et procédé de commande de paramètre associé Pending EP4338990A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202200019128 2022-09-19

Publications (1)

Publication Number Publication Date
EP4338990A1 true EP4338990A1 (fr) 2024-03-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP22197695.4A Pending EP4338990A1 (fr) 2022-09-19 2022-09-26 Système de réfrigération monobloc amélioré et procédé de commande de paramètre associé

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EP (1) EP4338990A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060042296A1 (en) * 2004-08-31 2006-03-02 Thermo King Corporation Mobile refrigeration system and control
JP2006266661A (ja) * 2005-02-28 2006-10-05 Mitsubishi Heavy Ind Ltd 冷凍装置およびその運転方法
US20150316311A1 (en) * 2014-05-02 2015-11-05 Thermo King Corporation Multi-temperature transport refrigeration system
US20170151859A1 (en) * 2015-11-30 2017-06-01 Thermo King Corporation Device and method for controlling operation of transport refrigeration unit
US20180195789A1 (en) * 2015-07-07 2018-07-12 Carrier Corporation Transport refrigeration unit
EP3517865A1 (fr) * 2016-09-19 2019-07-31 Denso Corporation Système de réfrigération et dispositif de commande
JP2019138619A (ja) * 2018-02-08 2019-08-22 キャリア コーポレイションＣａｒｒｉｅｒ Ｃｏｒｐｏｒａｔｉｏｎ 輸送用冷凍システム及び輸送用冷凍システムのための耐故障性配電方法
EP3812666A1 (fr) * 2019-10-21 2021-04-28 Thermo King Corporation Système de commande de climatisation de transport à refroidissement auxiliaire

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060042296A1 (en) * 2004-08-31 2006-03-02 Thermo King Corporation Mobile refrigeration system and control
JP2006266661A (ja) * 2005-02-28 2006-10-05 Mitsubishi Heavy Ind Ltd 冷凍装置およびその運転方法
US20150316311A1 (en) * 2014-05-02 2015-11-05 Thermo King Corporation Multi-temperature transport refrigeration system
US20180195789A1 (en) * 2015-07-07 2018-07-12 Carrier Corporation Transport refrigeration unit
US20170151859A1 (en) * 2015-11-30 2017-06-01 Thermo King Corporation Device and method for controlling operation of transport refrigeration unit
EP3517865A1 (fr) * 2016-09-19 2019-07-31 Denso Corporation Système de réfrigération et dispositif de commande
JP2019138619A (ja) * 2018-02-08 2019-08-22 キャリア コーポレイションＣａｒｒｉｅｒ Ｃｏｒｐｏｒａｔｉｏｎ 輸送用冷凍システム及び輸送用冷凍システムのための耐故障性配電方法
EP3812666A1 (fr) * 2019-10-21 2021-04-28 Thermo King Corporation Système de commande de climatisation de transport à refroidissement auxiliaire

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