EP3064865B1 - Installation de refroidissement à plusieurs étages à pression régulée et procédé de commande - Google Patents

Installation de refroidissement à plusieurs étages à pression régulée et procédé de commande Download PDF

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Publication number
EP3064865B1
EP3064865B1 EP16158435.4A EP16158435A EP3064865B1 EP 3064865 B1 EP3064865 B1 EP 3064865B1 EP 16158435 A EP16158435 A EP 16158435A EP 3064865 B1 EP3064865 B1 EP 3064865B1
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Prior art keywords
duct
inlet
plant
fluid
stage
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EP16158435.4A
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German (de)
English (en)
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EP3064865A1 (fr
Inventor
Davide PRATELLI
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Rivacold Srl
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Rivacold Srl
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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
    • F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • 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
    • 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
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
    • 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
    • F25B2400/12—Inflammable refrigerants
    • 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
    • F25B2500/27—Problems to be solved characterised by the stop of the refrigeration cycle
    • 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
    • F25B2600/027—Compressor control by controlling pressure
    • F25B2600/0271—Compressor control by controlling pressure the discharge pressure
    • 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
    • F25B2600/2519—On-off 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
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide

Definitions

  • the present invention relates to the field concerning the plant for the cooling, warming and/or cooling air conditioning and relates to a pressure controlled multistage cooling plant with a pressure controlled method of a lower stage when it is in a non-active condition.
  • FIG. 2 To counteract this phenomenon and to maintain the pressure within safety values a known solution, illustrated in Figure 2 , provides the use of a small refrigerator system S which cools the cooling fluid contained in the storage tank when the pressure sensor "SP" will reach consensus value corresponding to a predetermined maximum pressure threshold. Obviously the cooling of the low stage cooling fluid, contained in the receiver, causes the desired reduction of the pressure.
  • One object of the present invention is to propose a multistage cooling plant with simple pressure control, reliable and inexpensive.
  • Another object is to have the entire high stage circuit in a unique environment by limiting to the latter all the provisions and tests on the safety against fire and explosion risks related to the particular cooling fluid usable in this stage.
  • Another object is to propose a plant saving the main compressor of the high stage from wear and to save energy consumption.
  • the invention provides a cooling plant according to claim 1 and an operating method according to claim 10.
  • the document WO 2014/024837 discloses a multistage cooling plant with pressure control having at least a high stage comprising at least a set of first compressors, a set of first condensers, and a first duct of an intermediate heat exchanger means connected to form the high stage cooling circuit.
  • This known plant is provided with at least a low stage comprising at least a set of second compressors, a second duct means of the intermediate heat exchanger means, a set of user apparatus connected to form the low stage cooling circuit.
  • the plant comprises pressure sensor means assigned to detect the pressure of the low stage fluid and connected to control means assigned to activate feeding means when said pressure of the idle low stage fluid reaches or exceeds a predetermined threshold value.
  • the feeding means in the activation condition are connected to a duct of the intermediate heat exchanger means in said duct a cooling fluid of refrigerator of the low stage fluid.
  • numeral 1 indicates the multistage cooling plant with pressure control, object of the present invention, having a high stage 3, for example assigned to refrigerate, by means of its evaporators or heat exchangers, a set of medium temperature user equipment 13 or cells or rooms to be maintained at temperatures approximately between -5° C and + 5° C; obviously the high stage can carry out additional and/or alternative tasks, for example, the heating, cooling or air conditioning or, as better clarified in the following, the high stage 3 can be in the service of another stage of the plant for cooling the fluid thereof.
  • a high stage 3 for example assigned to refrigerate, by means of its evaporators or heat exchangers, a set of medium temperature user equipment 13 or cells or rooms to be maintained at temperatures approximately between -5° C and + 5° C; obviously the high stage can carry out additional and/or alternative tasks, for example, the heating, cooling or air conditioning or, as better clarified in the following, the high stage 3 can be in the service of another stage of the plant for cooling the fluid thereof.
  • the high stage 3 comprises a first compressor 5 or a set of first compressors, a first condenser 7 or a set of first condenser, at least a first receiver means 11, said set of user equipment 13 and a first duct 15 of an intermediate heat exchanger means 18; these elements are connected, via pipes, valves etc., to form the high stage cooling circuit in which circulates a respective cooling fluid consisting, for example in propane.
  • the first duct 15 may be connected in parallel to the set of user equipment 13.
  • the plant 1 is also provided with at least a low stage 20 comprising at least a second compressor 22 or a set of second compressors, a second duct 24 of the intermediate heat exchanger means 18, at least a second receiver means 26, a set of user apparatus 28 connected to form the low stage cooling circuit in which circulates a respective refrigerator fluid consisting, for example, in carbon dioxide; in the following the user apparatus are also indicated as the low stage user apparatus 28.
  • the intermediate exchanger is placed at a greater height with respect to the second receiver means 26 of the low stage 20 circuit.
  • the invention provides that the high stage 3 can be completely free of user equipment 13 for example in the case in which such high stage is totally dedicated to the cooling of the refrigerating fluid of the low stage 20; in other words the user equipment can consist in the first duct 15 of the intermediate heat exchanger means 18 so that, in this case, is the only user.
  • the plant 1 is provided with pressure sensor means 30, for example placed into the low stage circuit 20 upstream of the second duct 24 for detecting the pressure of the low stage fluid.
  • the pressure sensor means 30 are connected to control means, for example of microprocessor, programmable type, and provided with analog and/or digital inputs for sensors or detectors and outputs for the control and the operation of the various elements controlled by said control means.
  • control means for example of microprocessor, programmable type, and provided with analog and/or digital inputs for sensors or detectors and outputs for the control and the operation of the various elements controlled by said control means.
  • the plant 1 is provided with feeding means 31 controlled by the control means to feed the intermediate heat exchanger means 18 with a cooling fluid.
  • the control means are programmed to activate the feeding means 31 when said pressure of the fluid of idle low stage 20 reaches or exceeds a predetermined threshold value.
  • the feeding means 31 are connected to a duct of the intermediate heat exchanger means 18 to feed said duct with a cooling fluid and to expand the latter for refrigerating the fluid of the low stage 20.
  • said duct means of the intermediate heat exchanger means 18 connected to the feeding means 31 consists in the first duct 15 of the intermediate heat exchanger means 18 and the refrigeration cooling fluid adducted by the feeding means 31 consists in the fluid of the high stage 3 in the liquid state that is expanded by special members of the feeding means 31 in this first duct 15.
  • a simple alternative of the invention provides that said duct of the intermediate heat exchanger means 18 connected to the feeding means 31 is run through by any refrigerating fluid which expands in it or by any low temperature carrier liquid assigned to cool such intermediate heat exchanger means and in particular the low stage fluid contained therein.
  • the first embodiment of the invention provides that the feeding means 31 and the expansion means include a safety compressor 40 whose input is connected to a first inlet 19 of the first duct 15 of the intermediate heat exchanger means 18 whose outlet is connected to an inlet of the safety condenser 41 the outlet of which is connected to the inlet of the first receiver means 11.
  • the outlet of the first receiver means 11 is connectable, by a first cut-off valve 42 and by a first expansion means 43 actuated by the control means, to the second inlet 21 of the first duct 15.
  • This solution allows to use the fluid and many of the standard circuit elements of the high stage, for example the intermediate heat exchanger means 18, and allows at the same time to save the wear of the first compressor 5 and to save part of the energy necessary for the running of this latter because the safety compressor 40 is of lower power.
  • the plant comprises a first check valve 27 interposed and oriented between the outlet of the at least a first condenser 7 and the inlet of the first receiver means 11 and comprises a second check valve 44 interposed and oriented between the outlet of the at least one safety condenser 41 and the inlet of the first receiver means 11; these check valves prevent reflux of the high stage fluid.
  • the high stage 3 also comprises a second cut-off valve 23 interposed between the outlet of the first receiver means 11 and the first inlet 19 of the first duct 15 and a third cut-off valve 25 interposed between the second inlet 21 of the first duct 15 and the inlet of the at least one first compressor 5, where such second 23 and third 25 cut-off valves are actuated by the control means.
  • the third cut-off valve 25 is close actuated by the control means.
  • the plant comprises a fourth cut-off valve 29 for each possible user equipment 13. These fourth cut-off valves 29 are actuated to manage the production of cold in each of the user equipment 13.
  • the first compressor 5 can cool the user equipment 13 whose fourth cut-off valves 29 are open.
  • the ducts and connections in the installation 1 are arranged in such a way that when it is active at least one of the first compressor 5, the fluid of the high stage 3 flows from the first inlet 19 to the second inlet 21 of the first duct 15; when the at least one safety compressor 40 is active, the fluid of the high stage 3 flows from the second inlet 21 to the first inlet 19 of the first duct 15.
  • cut-off valves 23, 25, 29, 42 actuated in a coordinated manner with the first compressor 5, for example allow to switch the high stage 3 in a cooling and pressure reduction condition of the fluid of the low stage 20.
  • the invention provides that the plant can be provided with an optional third duct 50 assigned to put in flow communication the top of the second receiver 26, or the outlet for the vapors or gases of the second receiver 26, with the duct connecting the outlet of the at least a second compressor 22 with the inlet of the second duct 24 of the intermediate heat exchanger means 18.
  • This third duct 50 is of small inner lumen, for example the diameter of its inner lumen ranges from the half to one tenth of the average diameter, or minimum diameter, of the other ducts and tubes of the low stage 20. Surprisingly this third duct 50 provides a better operation of the plant, perhaps because it creates a small differential pressures inside the intermediate exchanger, low stage side, during the pressure control phases.
  • the method for controlling the pressure of a cooling fluid of an idle low stage of a multistage plant provides that in an condition in which the low stage 20 is idle and the plant pressure sensor means 30 detects and provides the control means with a pressure value of the fluid of the low stage higher than a predetermined threshold, to actuate, by means of said control means, the feeding means 31 to feed a refrigerant fluid of any nature in a duct of an intermediate heat exchanger means 18 assigned to the thermic exchange between the cooling fluids of a high and lower stages of the plant.
  • the feeding of the refrigerant fluid in the intermediate heat exchanger means 18 cools the cooling fluid of such low stage housed in a second duct 24 of the intermediate heat exchanger means 18 and being part of the cooling circuit of the low stage itself. Such cooling produces the reduction of pressure of the cooling fluid of the low stage.
  • the method provides to expand the cooling fluid of the high stage of the plant in a first duct 15 of the intermediate heat exchanger means 18 having the second duct 24 inserted in the cooling circuit of the lower stage 20.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Air Conditioning Control Device (AREA)

Claims (10)

  1. Installation de refroidissement à plusieurs étages à pression régulée ayant au moins un étage haut (3) comprenant au moins un ensemble de premiers compresseurs (5), un ensemble de premiers condenseurs (7), au moins un premier moyen récepteur (11) et un premier conduit (15) d'un moyen échangeur de chaleur intermédiaire (18) mutuellement reliés pour former le circuit de réfrigération d'étage haut ; ladite installation (1) comportant en outre au moins un étage bas (20) comprenant au moins un ensemble de seconds compresseurs (22), un deuxième conduit (24) du moyen échangeur de chaleur intermédiaire (18), au moins un second moyen récepteur (26) et un ensemble d'appareils d'utilisateur d'étage bas (28) mutuellement reliés pour former le circuit de réfrigération d'étage bas, un moyen de commande pour commander divers éléments de l'installation, un moyen d'alimentation (31) pour alimenter en fluide de refroidissement le moyen échangeur de chaleur intermédiaire (18) ; ladite installation comprend un moyen capteur de pression (30) destiné à détecter la pression du fluide de l'étage bas (20) et relié au moyen de commande configuré pour activer le moyen d'alimentation (31) lorsque ladite pression du fluide de l'étage bas inactif (20) atteint ou dépasse une valeur de seuil prédéterminée ; ledit moyen d'alimentation (31) est activé et relié à un conduit du moyen échangeur de chaleur intermédiaire (18) pour alimenter, dans ledit conduit, un fluide de refroidissement pour refroidir le fluide de l'étage bas (20) dans un état d'activation dudit moyen d'alimentation (31) ; ledit conduit du moyen échangeur de chaleur intermédiaire (18) qui peut être relié au moyen d'alimentation (31) consiste en le premier conduit (15) du moyen échangeur de chaleur intermédiaire (18) et le fluide de refroidissement alimenté par le moyen d'alimentation (31) consiste en le fluide de l'étage haut (3) ; ladite installation est caractérisée par le fait que le moyen d'alimentation (31) comprend au moins un compresseur de sécurité (40), au moins un condenseur de sécurité (41), une première vanne d'arrêt (42) et un premier moyen de détente (43) ; l'entrée du compresseur de sécurité (40) est reliée à une première entrée (19) du premier conduit (15) du moyen échangeur de chaleur intermédiaire (18) et la sortie dudit compresseur de sécurité (40) est reliée à une entrée de l'au moins un condenseur de sécurité (41) dont la sortie est reliée à l'entrée du premier moyen récepteur (11) dont la sortie est apte à être reliée, à l'aide de la première vanne d'arrêt (42) et du premier moyen de détente (43) actionnés par le moyen de commande, à la seconde entrée (21) du premier conduit (15), ledit premier conduit (15), ledit compresseur de sécurité (40), ledit condenseur de sécurité (41), ledit premier moyen récepteur (11), ladite première vanne d'arrêt (42) et ledit premier moyen de détente (43), dans l'état d'activation actionné par le moyen de commande, constituant le circuit du moyen d'alimentation (31) pour refroidir le fluide de l'étage bas (20).
  2. Installation selon la revendication 1, caractérisée par le fait que l'étage haut (3) comprend une deuxième vanne d'arrêt (23) interconnectée entre la sortie du premier moyen récepteur (11) et la première entrée (19) du premier conduit (15), et une éventuelle troisième vanne d'arrêt facultative (25) interconnectée entre la seconde entrée (21) du premier conduit (15) et l'entrée de l'au moins un premier compresseur (5), lesdits deuxième (23) et troisième (25), facultative, vannes d'arrêt étant actionnées par le moyen de commande.
  3. Installation selon la revendication 1 ou 2, caractérisée par le fait qu'elle comprend un premier clapet de non-retour (27) interconnecté entre et orienté de la sortie de l'au moins un premier condenseur (17) vers l'entrée du premier moyen récepteur (11), et qu'elle comprend un second clapet de non-retour (44) interconnecté entre et orienté de la sortie de l'au moins un condenseur de sécurité (41) vers l'entrée du premier moyen récepteur (11) .
  4. Installation selon l'une quelconque des revendications 2 ou 3, caractérisée par le fait qu'elle comprend un ensemble d'équipements d'utilisateur (13) et un ensemble de quatrièmes vannes d'arrêt correspondantes (29) actionnées pour gérer la production de froid dans chacun des équipements d'utilisateur (13).
  5. Installation selon la revendication 1, caractérisée par le fait que les conduits et liaisons de l'installation (1) sont disposés de telle sorte que, lorsqu'au moins un parmi l'ensemble de premiers compresseurs (5) est actif, le fluide de l'étage haut (3) s'écoule de la première entrée (19) à la seconde entrée (21) du premier conduit (15) ; lorsque l'au moins un compresseur de sécurité (40) est actif, le fluide de l'étage haut (3) s'écoule de la seconde entrée (21) à la première entrée (19) du premier conduit (15).
  6. Installation selon la revendication 1, caractérisée par le fait que le moyen de commande est configuré pour actionner au moins un premier compresseur de l'ensemble de premiers compresseurs (5).
  7. Installation selon la revendication 6, caractérisée par le fait qu'elle comprend une deuxième vanne d'arrêt (23) interconnectée entre la sortie du premier moyen récepteur (11) et la première entrée (19) du premier conduit (15), ladite deuxième vanne d'arrêt (23) étant ouverte par le moyen de commande au moins pendant le fonctionnement d'au moins un parmi l'ensemble de premiers compresseurs (5), et facultativement, elle comprend un ensemble d'équipements d'utilisateur (13) et un ensemble de quatrièmes vannes d'arrêt correspondantes (29) actionnées pour gérer la production de froid dans chacun des équipements d'utilisateur (13).
  8. Installation selon l'une quelconque des revendications précédentes, caractérisée par le fait qu'elle comprend un troisième conduit (50) reliant en communication fluidique la partie supérieure du second moyen récepteur (26) au conduit reliant la sortie de l'au moins un second compresseur (22) à l'entrée du deuxième conduit (24) du moyen échangeur de chaleur intermédiaire (18) .
  9. Installation selon la revendication 8, caractérisée par le fait que le diamètre de la lumière interne dudit troisième conduit (50) se situe dans la plage allant de la moitié à un dixième du diamètre de la lumière des autres conduits et tubes de l'étage bas (20).
  10. Procédé de régulation de la pression d'un fluide d'un étage bas inactif d'une installation de refroidissement à plusieurs étages selon l'une quelconque des revendications 1 à 7, caractérisé par, dans un état inactif de l'étage bas (20) et lorsque le moyen de commande de l'installation reçoit, en provenance du moyen capteur de pression (30), une valeur de pression détectée dépassant un seuil prédéterminé, l'actionnement, à l'aide dudit moyen de commande, du moyen d'alimentation (31) pour alimenter en fluide de refroidissement un moyen échangeur de chaleur intermédiaire (18) appartenant aux circuits de réfrigération de l'étage bas (20) et d'un étage haut (3) de l'installation de refroidissement à plusieurs étages et destiné au moins à l'échange de chaleur entre les fluides desdits étages bas (20) et haut (3).
EP16158435.4A 2015-03-05 2016-03-03 Installation de refroidissement à plusieurs étages à pression régulée et procédé de commande Active EP3064865B1 (fr)

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Application Number Priority Date Filing Date Title
ITUB2015A000468A ITUB20150468A1 (it) 2015-03-05 2015-03-05 Impianto frigorifero multistadio con controllo della pressione e metodo di controllo

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EP3064865A1 EP3064865A1 (fr) 2016-09-07
EP3064865B1 true EP3064865B1 (fr) 2019-10-09

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1403526B1 (it) * 2011-01-24 2013-10-31 Rivacold S R L Impianto frigorifero multi-utenza
JP5575191B2 (ja) * 2012-08-06 2014-08-20 三菱電機株式会社 二元冷凍装置
JP5800994B2 (ja) * 2012-09-21 2015-10-28 三菱電機株式会社 冷凍装置及びその制御方法
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