EP2198223A2 - Système de réfrigération/congélation intégré et procédé de dégivrage - Google Patents

Système de réfrigération/congélation intégré et procédé de dégivrage

Info

Publication number
EP2198223A2
EP2198223A2 EP08840007A EP08840007A EP2198223A2 EP 2198223 A2 EP2198223 A2 EP 2198223A2 EP 08840007 A EP08840007 A EP 08840007A EP 08840007 A EP08840007 A EP 08840007A EP 2198223 A2 EP2198223 A2 EP 2198223A2
Authority
EP
European Patent Office
Prior art keywords
temperature
low
medium
compressor
valve
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.)
Withdrawn
Application number
EP08840007A
Other languages
German (de)
English (en)
Other versions
EP2198223A4 (fr
Inventor
Zhong GU
Zhiwei He
Chuanxue Duan
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP2198223A2 publication Critical patent/EP2198223A2/fr
Publication of EP2198223A4 publication Critical patent/EP2198223A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • A47F3/0482—Details common to both closed and open types
    • 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
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • 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
    • F25B2400/13—Economisers
    • 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

Definitions

  • This disclosure relates to a refrigerating/freezing display cabinet system and, in particular, to a medium and low-temperature integrated refrigeration/freezing display cabinet system for displaying foods and/or beverage products.
  • all the refrigerating systems comprise at least the following parts: a compressor, a heat rejection heat exchanger ("condenser”), at least one evaporator combined with a display cabinet, an expansion valve and suitable refrigerant pipelines connected with above devices within a closed circulation loop.
  • the expansion valve is provided upstream along the refrigerant pipeline relative to the inlet of the evaporator and is used to expand the liquid refrigerant to a desired lower pressure, wherein the lower pressure is selected according to the specific refrigerant to enter the evaporator.
  • the medium-temperature refrigerating system comprises: a compressor 1, a condenser 2, a reservoir 3, an expansion valve 4 and an evaporator 5.
  • the high-temperature and high-pressure gas When a low-temperature and low-pressure gas, as the refrigerant, is changed into a high-temperature and high-pressure gas after having been compressed by the compressor 1 , the high-temperature and high-pressure gas enters the condenser 2 for cooling and becomes a high-temperature and high-pressure liquid accompanied by a process of heat dissipation, and subsequently, the high-temperature and high- pressure liquid flows to the expansion valve 4 after passing through the reservoir 3.
  • a low-temperature and low-pressure gas as the refrigerant
  • the expansion valve 4 can select the desired pressure of the refrigerant after expansion according to the selected type of the refrigerant, and the high-temperature and high-pressure liquid is changed into a low-temperature and low-pressure liquid and gas two-phase flow by the expansion valve 4 by throttling, and then after passing through the evaporator 5 such a two-phase flow becomes a low-temperature and low-pressure gas and absorbs heat from the air flow to provide the refrigeration effect.
  • the low-temperature refrigerating system shown in Fig. 2 it also comprises a compressor 11, a condenser 12, a reservoir 13, an expansion valve 14, an evaporator 15 and a liquid injection valve 16.
  • the operational process of the low-temperature refrigerating system is similar to that of the medium-temperature refrigerating system, except that in the low-temperature refrigerating system, in order to lower the discharge temperature of the compressor 11, a branch of the refrigerant pipeline is provided between the compressor 11 and the reservoir 13, and the liquid injection valve 16 is provided in such a branch.
  • a branch of the refrigerant pipeline is provided between the compressor 11 and the reservoir 13, and the liquid injection valve 16 is provided in such a branch.
  • Such an integrated medium and low-temperature refrigerating/freezing system may improve the operational stability of the system, takes less space and may be able to achieve integrated solutions in a "plug and play" manner, thus saving space for installation and tuning for the customers.
  • D2D discharge gas defrosting
  • the present disclosure provides a medium and low-temperature integrated refrigeration/freezing system with the function of discharge gas defrosting.
  • the refrigeration/freezing system of the present disclosure may not only improve the refrigeration efficiency and save energy resources, but also can switch between the normal operational state and a discharge gas defrosting state, which may improve the operational stability of the system.
  • a medium and low-temperature integrated refrigeration/freezing system with the function of discharge gas defrosting.
  • a medium-temperature refrigerating system and a low-temperature freezing system are integrated to apply D2D technology.
  • the system comprises at least a medium-temperature compressor, a low-temperature compressor, a condenser, a reservoir, an intercooler, a medium-temperature evaporator, a low-temperature evaporator, and four control valves, two adjusting valves, two one-way valves and three expansion valves; and by controlling the combination of actions between these four control valves, the switching is performed between the refrigerating cycle operation and the discharge gas defrosting operation
  • the medium and low-temperature integrated system may perform the refrigerating cycle operation. Further, when the system performs the refrigerating cycle operation, the suction temperature of the low-temperature compressor may be adjusted by the first adjusting valve, so as to lower the discharge temperature of the low-temperature compressor.
  • the system may perform the discharge gas defrosting operation. Further, when the system performs the discharge gas defrosting operation, the suction temperature of the low-temperature compressor may be adjusted by the second adjusting valve, so as to lower the discharge temperature of the low-temperature compressor.
  • the medium-temperature compressor and the low-temperature compressor may be both in operation.
  • the medium and low-temperature integrated refrigeration/freezing system comprises at least a medium-temperature compressor, a low-temperature compressor, a condenser, a reservoir, an intercooler, a medium-temperature evaporator, a low-temperature evaporator, and four control valves, two adjusting valves, two one-way valves and three expansion valves, and by using the combination of actions between these four control valves the switching between the refrigerating cycle operation and the discharge gas defrosting operation is performed.
  • the medium and low-temperature integrated system performs the refrigerating cycle operation; and when the first control valve is closed and the second valve is opened, and the fourth valve is closed to the refrigerant pipeline to the intercooler, the medium and low-temperature integrated system performs the discharge gas defrosting operation.
  • the suction temperature of the low- temperature compressor may be adjusted by the first adjusting valve, so as to lower the discharge temperature of the low-temperature compressor.
  • the suction temperature of the low-temperature compressor may be adjusted by the second adjusting valve, so as to lower the discharge temperature of the low- temperature compressor.
  • the low-temperature evaporator may be provided with a temperature sensor, and the relevant parameters of said temperature sensor may be preset to determine the starting time and ending time of the discharge gas defrosting operation.
  • the medium and low-temperature integrated refrigeration/freezing system of the present disclosure it not only can perform normal refrigerating cycle operation and discharge gas defrosting operation based on a medium-temperature compressor set and a low-temperature compressor set, but also it can improve the operational efficiency of the whole integrated system by using the heat exchange between the medium-temperature refrigerating system and the low-temperature freezing system.
  • a temperature sensor may be fitted in the low- temperature evaporator and the starting time and ending time of the discharge gas defrosting can be determined quickly through the intelligent control of relevant parameters. After the low-temperature evaporator is optimized by redesign, the defrosting time can be reduced and the defrosting can be performed thoroughly.
  • FIG. 1 is a block diagram of the principles of the structure of a medium-temperature refrigerating system in the prior art
  • FIG. 2 is a block diagram of the principles of the structure of a low-temperature freezing system in the prior art;
  • Fig. 3A shows a schematic diagram of the structure of a discharge gas defrosting system in performing normal refrigerating cycle, and
  • Fig.3B shows a schematic diagram of the structure of the discharge gas defrosting system in performing discharge gas defrosting;
  • Fig. 4 shows a schematic diagram of the structure of a medium and low-temperature integrated refrigeration/freezing system
  • Fig. 5 shows a schematic diagram of the structure of a medium and low-temperature integrated refrigeration/freezing system with the function of discharge gas defrosting according to one or more aspects of the present disclosure
  • Fig. 6 shows a schematic diagram of the principles of the medium and low-temperature integrated refrigeration/freezing system shown in Fig.5 in a normal operational state;
  • Fig. 7 shows a schematic diagram of the principles of the medium and low-temperature integrated refrigeration/freezing system shown in Fig.5 in a discharge gas defrosting state.
  • Fig. 3 A shows a schematic structural diagram of a discharge gas defrosting system in performing normal refrigerating cycle
  • Fig. 3B shows a schematic structural diagram of a discharge gas defrosting system in performing discharge gas defrosting.
  • the discharge gas defrosting system mainly comprises a medium-temperature compressor 21, a low-temperature compressor 22, a medium-temperature evaporator 31, a low-temperature evaporator 30 and control valves 41 to 45.
  • the parts shown by respective dash lines represent the refrigerant pipelines not involved in the cycles of the respective operational states
  • the parts shown by respective solid lines represent the refrigerant pipelines involved in the cycles of the respective operational states.
  • Fig. 3A when the system is performing the normal refrigerating cycle, after the low-temperature and low-pressure refrigerant has been compressed by the medium-temperature compressor and the low-temperature compressor, the control valve 41 is open and the high-temperature and high-pressure gas discharged from the medium-temperature compressor 21 and the low- temperature compressor 22 is transmitted to the condenser (not shown) and then returns to respective compressors via the medium-temperature evaporator 31 and the low-temperature evaporator 30.
  • the suction temperature of the low-temperature compressor 22 is adjusted by the control valve 44 by throttling, thereby the discharge temperature of the low-temperature compressor 22 is lowered and the compressor 22 is better protected.
  • an expansion valve can also be added at the intake of the medium- temperature evaporator 31 to change the high-temperature and high-pressure liquid into a low-temperature and a low-pressure liquid and gas two-phase flow by throttling, which changes into the low-temperature and low- pressure gas after having passed through the evaporator and absorbs heat from the air flow to produce the refrigeration effects.
  • Fig. 4 shows a schematic structural diagram of a medium and low-temperature integrated refrigeration/freezing system.
  • the original independent medium-temperature system and low-temperature system of FIGS. 1 and 2 are integrated into a CDU unit 20, in which the performance of the integrated system is improved by the heat exchange between the medium-temperature system and the low-temperature system.
  • the integrated system mainly comprises: a medium-temperature compressor 21, a low-temperature compressor 22, a heat rejection heat exchanger (condenser) 23, a reservoir 24, an expansion device (valve) 25, an intercooler 26, an adjusting valve 27, expansion devices (valves) 28 and 29, a low-temperature heat absorption heat exchanger (evaporator) 30 and a medium-temperature evaporator 31.
  • the condenser 23 combines the cooling function of the condenser in the independent medium-temperature system and that of the condenser in the independent low-temperature system
  • the reservoir 24 replaces the respective reservoirs of the independent medium-temperature system and of the independent low-temperature system.
  • the intercooler 26 and the expansion valve 25 are used to adjust the subcooling at the low temperature to improve the overall performance of the system.
  • a given CDU may be connected to multiple such medium temperature evaporators and/or cabinets and/or multiple low temperature evaporators and/or cabinets.
  • each CDU may have multiple such medium temperature compressors and/or low temperature compressors in respective compressor sets.
  • the low-temperature and low-pressure refrigerant is changed into a high-temperature and high-pressure gas after having been compressed by the medium- temperature compressor 21 and the low-temperature compressor 22;
  • the high-temperature and high-pressure gas changes into high-temperature and high-pressure liquid after having entered the condenser 23 and dissipated a large quantity of heat.
  • the refrigerant After passing through the reservoir 24, the refrigerant is divided into three pipelines or branches: in the first pipeline 51 it is changed into a low-temperature and low-pressure liquid and gas two-phase flow by throttling by the expansion valve 29, is changed into a low-temperature and low-pressure gas after having entered the medium-temperature evaporator 31 and absorbed heat to provide the refrigeration effects, and then returns to the medium-temperature compressor 21 ; in the second pipeline 52 it is changed into a low-temperature and low-pressure liquid and gas two-phase flow by precooling by the intercooler 26 and throttling by the expansion valve 28, changes into a low-temperature and low-pressure gas after having entered the low-temperature evaporator 30 and absorbed heat to produce the refrigeration effects, and then returns to the low-temperature compressor 22; and in the third pipeline/branch 54 it passes through the expansion valve 25 and the intercooler 26 (where it absorbs heat from the flow in the second pipeline 52) to adjust the subcooling at the low temperature, and
  • the efficiency of the low-temperature level is improved by the energy transfer. It is shown by experiment data that the energy efficiency ratio of the low-temperature level is 1.1 and that of the medium-temperature level is 2.2. Thus, the performance of the whole integrated system and the operational stability of the medium and low-temperature systems can be improved by the heat exchange between the medium-temperature system and the low-temperature system.
  • Fig. 5 shows a schematic structural diagram of a medium and low-temperature integrated refrigeration/freezing system 100 with the function of discharge gas defrosting and having a CDU 102 coupled to a low temperature cabinet 202 and a medium temperature cabinet 200.
  • the medium and low-temperature integrated refrigeration/freezing system 100 with the function of discharge gas defrosting of the present disclosure introduces an operational process for discharge gas defrosting and it can ensure the switching between the normal operational state and the discharge gas defrosting state in the medium and low-temperature integrated system by controlling relevant valves (under control of a control system (e.g., a microcontroller) (not shown)).
  • a control system e.g., a microcontroller
  • the integrated system shown in Fig. 5 mainly comprises: a medium-temperature compressor 120, a low- temperature compressor 122, a condenser 124, a reservoir 126, an intercooler 128, a medium-temperature evaporator 130, a low-temperature evaporator 132, control valves 141-144, adjusting valves 145 and 146, one-way valves (check valves) 147 and 148, and expansion devices (valves) 150, 152, 154.
  • the condenser combines simultaneously both the cooling functions of the condenser in the independent medium-temperature system and the condenser in the independent low-temperature system, and the reservoir has replaced the respective reservoirs of the independent medium-temperature system and of the independent low-temperature system.
  • the switching between the normal operational state and the discharge gas defrosting state can be realized by controlling the combination of actions between control valves 141-144, and the suction status of the low-temperature system in the normal operational state and the discharge gas defrosting state can be adjusted by the adjusting valves 145 and 146, so as to lower the suction temperature of the low- temperature compressor, and to lower the discharge temperature of the low- temperature compressor to better ensure the stable operation of the low-temperature compressor set.
  • Fig. 6 shows a schematic diagram of the principles of the medium and low-temperature integrated refrigeration/freezing system shown in Fig. 5 in its normal operational state.
  • the parts shown by the dashed lines in Fig. 6 represent the refrigerant pipelines not involved in circulation during the normal operation
  • the parts shown by the solid lines represent the refrigerant pipelines involved in the circulation during the normal operation.
  • the system has pipelines (branches) 160, 162, and 164 (including sub-branches 164-1 and 164-2) that are similarly configured and perform similar functions to the corresponding pipelines or branches 50, 52, 54 of FIG. 4.
  • An additional pipeline/branch 166 is provided between a location along the main flowpath 167 downstream of the condenser 22 and upstream of the intercooler 26 to the pipeline/branch 162 downstream of the intercooler at the control valve 144 for recirculating refrigerant in the defrost mode (discussed below).
  • a pipeline/branch 168 is provided from a location downstream of the compressors 120 and 122 to upstream of the low temperature compressor 122.
  • the control valves 142 and 143 are respectively positioned along the pipeline/branch 168 for diverting compressed refrigerant in the defrost mode (discussed below).
  • the adjusting valve 146 is along a bypass pipeline/flowpath 170 joining the suction conditions of the two compressors.
  • the one-way valve 147 is along a bypass pipeline/flowpath 172 in parallel with the expansion valve 152.
  • control valve 142 When the integrated system 100 is in the normal operational state, the control valve 142 is set (shut off) to prevent flow along the pipeline/flowpath branch 168 and the one-way valve 147 is in aclosed condition, and the control valve 14 is set to block flow along the pipeline/branch flowpath 166 while permitting flow along the pipeline/branch 162 from the intercooler 128 to the expansion valve 152 and low temperature evaporator 132.
  • the low-temperature and low-pressure refrigerant is changed into the high-temperature and high-pressure gas after having been compressed by the medium- temperature compressor 120 and the low-temperature compressor 122, the high-temperature and high-pressure gas enters the condenser 124 via the control valve 141 for cooling and becomes a high-temperature and high-pressure liquid accompanied by a process of heat dissipation; then the high-temperature and high-pressure liquid is divided into three pipelines 160, 162, 164 after having passed through the one-way valve 148 and the reservoir 126, and the detailed operations of the three pipelines have been described above with respect to Fig. 4 and shall not be further repeated here. [0036] Fig.
  • FIG. 7 shows a schematic diagram of the medium and low-temperature integrated refrigeration/freezing system of Fig. 5 in the discharge gas defrosting state.
  • parts shown by the dash lines represent the refrigerant pipelines not involved in the circulation during the discharge gas defrosting
  • the parts shown by the solid lines represent the refrigerant pipelines involved in the circulation during the discharge gas defrosting.
  • the control valve 141 is shut off/closed
  • the one-way valve 148 is in a closed condition and the expansion valves 152 and 154 are shut off/closed
  • the control valve 142 is open (to permit flow along the branch 168) and the one-way valve 147 is in an open condition.
  • the system's operation principles during the discharge gas defrosting is also described according to the refrigerant's direction of flow: the low-temperature and low-pressure refrigerant, exits the medium temperature evaporator 130 and enters into the medium-temperature compressor 120 and, via the adjusting valve 146, into the low-temperature compressor.
  • the refrigerant is compressed, by the compressors, is changed into the high- temperature and high-pressure gas, enters the low-temperature evaporator 132 (in a reverse of the refrigerant direction) via the control valves 142 and 143.
  • the refrigerant then enters the expansion valve 150 via the one-way valve 147 (bypassing the expansion valve), the control valve 144 and the reservoir 126, and returns to the compressor set via the medium- temperature evaporator 130 after having been transformed into a low-temperature and low-pressure liquid and gas two-phase flow by throttling in the expansion valve 150.
  • the use of a condenser is not involved in any one of the refrigerant pipelines.
  • a temperature sensor (not shown) may be embedded in the low-temperature evaporator and the starting time and ending time of the discharge gas defrosting can be determined quickly by the intelligent control of relevant parameters by the control system (controller).
  • the time of defrosting can be reduced and the defrosting can be performed thoroughly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

Un système de réfrigération/congélation intégré à moyenne et basse température (100) présente la fonction de dégivrage au gaz de décharge. Il comprend des groupes compresseurs à moyenne et basse température (120, 122) et des évaporateurs à moyenne et basse température, ainsi que des soupapes de commande (141, 142, 143, 144), des soupapes régulatrices (145, 146), des soupapes de non-retour (147, 148) et des soupapes de détente (150, 152, 154), et la commutation entre un cycle de réfrigération et le cycle de dégivrage au gaz de décharge est réalisée par la combinaison d'actions entre de multiples soupapes de commande. Lorsqu'une première soupape de commande est ouverte, qu'une deuxième soupape est fermée et qu'une quatrième soupape est fermée au conduit de fluide frigorigène vers ledit réservoir, l'opération du cycle de réfrigération est réalisée ; et lorsque la première soupape de commande est fermée, que la deuxième soupape est ouverte et que la quatrième soupape est fermée à la conduite de fluide frigorigène d'un refroidisseur intermédiaire (128), l'opération de dégivrage au gaz de décharge est réalisée.
EP08840007.2A 2007-10-17 2008-10-17 Système de réfrigération/congélation intégré et procédé de dégivrage Withdrawn EP2198223A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2007101813254A CN101413745B (zh) 2007-10-17 2007-10-17 一种具有排气除霜功能的中低温集成式冷藏/冷冻系统
PCT/US2008/080298 WO2009052369A2 (fr) 2007-10-17 2008-10-17 Système de réfrigération/congélation intégré et procédé de dégivrage

Publications (2)

Publication Number Publication Date
EP2198223A2 true EP2198223A2 (fr) 2010-06-23
EP2198223A4 EP2198223A4 (fr) 2014-09-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08840007.2A Withdrawn EP2198223A4 (fr) 2007-10-17 2008-10-17 Système de réfrigération/congélation intégré et procédé de dégivrage

Country Status (4)

Country Link
US (1) US20100205984A1 (fr)
EP (1) EP2198223A4 (fr)
CN (1) CN101413745B (fr)
WO (1) WO2009052369A2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN105674622A (zh) * 2016-03-31 2016-06-15 天津众石睿哲科技有限责任公司 一种使用满液式储液蒸发器的二氧化碳热泵系统

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US20100205984A1 (en) 2010-08-19
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