WO2009052368A1 - Système de réfrigération/congélation intégré à températures moyennes et basses - Google Patents

Système de réfrigération/congélation intégré à températures moyennes et basses Download PDF

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Publication number
WO2009052368A1
WO2009052368A1 PCT/US2008/080297 US2008080297W WO2009052368A1 WO 2009052368 A1 WO2009052368 A1 WO 2009052368A1 US 2008080297 W US2008080297 W US 2008080297W WO 2009052368 A1 WO2009052368 A1 WO 2009052368A1
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WO
WIPO (PCT)
Prior art keywords
temperature
low
medium
refrigerating
freezing
Prior art date
Application number
PCT/US2008/080297
Other languages
English (en)
Inventor
Zhong GU
Zhiwei He
Chuanxue Duan
Original Assignee
Carrier Corporation
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 Corporation filed Critical Carrier Corporation
Priority to EP08839645.2A priority Critical patent/EP2198211A4/fr
Priority to US12/680,984 priority patent/US20100212350A1/en
Publication of WO2009052368A1 publication Critical patent/WO2009052368A1/fr

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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
    • 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
    • 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
    • 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
    • F25B2400/16—Receivers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/21—Refrigerant outlet evaporator 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers

Definitions

  • the present disclosure relates to a medium- and low-temperature integrated refrigerating/freezing system, and in particular to an integrated system for providing medium-temperature refrigerating and low-temperature freezing for foods and cold drinks, etc. in supermarkets and convenience stores.
  • freezing systems are classified as low-temperature freezing systems and medium-temperature refrigeration systems.
  • Low-temperature freezing systems usually provide an evaporator temperature of about 30-35 degrees centigrade below zero, mainly for products such as ice cream or other frozen food.
  • Medium-temperature refrigerating systems usually provide an evaporator temperature of about 8-10 degrees centigrade below zero for products such as milk, drinks, produce, meat, and other perishable foods.
  • Fig. 1 is a schematic diagram of the structure of a medium-temperature refrigerating system which comprises a compressor 1, a condenser 2, an expansion valve 4, a reservoir 3, an evaporator 5 connected with a medium-temperature refrigerating cabinet and refrigerant pipes 6 correspondingly connecting the devices and forming a closed circulation loop.
  • a medium-temperature refrigerating system which comprises a compressor 1, a condenser 2, an expansion valve 4, a reservoir 3, an evaporator 5 connected with a medium-temperature refrigerating cabinet and refrigerant pipes 6 correspondingly connecting the devices and forming a closed circulation loop.
  • low-temperature and low-pressure gaseous refrigerant is changed into high-temperature and high-pressure gas after having been compressed by the compressor 1.
  • the high-temperature and high-pressure gaseous refrigerant After entering into the condenser 2, the high-temperature and high-pressure gaseous refrigerant releases its heat to the ambient, transforms into a high-temperature and high-pressure liquid and flows into the expansion valve 4 via the reservoir 3.
  • the expansion valve 4 reduces the pressure of the refrigerant and adjusts the flow rate of the refrigerant, so as to enable the high-temperature and high-pressure liquid refrigerant to change into low-temperature and low-pressure two-phase liquid and gas and to flow into the evaporator 5.
  • a fan (not shown) is also provided near the evaporator inside the refrigerating cabinet for blowing air towards the surface of the coiled pipes of the evaporator in order to have heat exchange between the low-temperature and low-pressure liquid refrigerant in the coiled pipes of the evaporator 5 and the air flowing through the surface of the coiled pipes of the evaporator, so as to generate cold air for preservation and storage of various foods in the refrigerating cabinet.
  • the refrigerant changes into a low-temperature and low-pressure gas after absorbing heat and flows back to the compressor 1, completing a complete and closed cycle by the refrigerant.
  • Fig. 2 is a schematic diagram of the structure of a low-temperature freezing system, of which the working principle is essentially the same as that of the medium-temperature refrigerating system. Since the low-temperature freezing system is required for generating relatively lower temperature, the system has a relatively high compression ratio, and in order to protect the low-temperature compressor it is needed to lower the exhaust temperature of the low-temperature compressor 1. In comparison with a medium-temperature refrigerating system, therefore, in the structure of the low-temperature freezing system, the refrigerant flowing out of the reservoir 3 flows into a branch as well as directly into the evaporator 5.
  • the high-temperature and high-pressure liquid refrigerant from the reservoir 3 flows via an injection valve 7, expands, absorbs heat and changes into a low-temperature and low-pressure gas which is provided directly to the compressor 1.
  • the refrigerant in the branch lowers the suction temperature of the compressor 1, thereby the exhaust temperature of the compressor 1 being lowered and the compressor 1 being effectively protected.
  • the two currently available independent systems are capable of providing supermarkets and convenience stores with a low-temperature freezing system and a medium-temperature refrigerating system respectively, and meeting the requirements for the storage of various foods at medium-temperature and low-temperature.
  • machine rooms are needed in the supermarkets and convenience stores for accommodating the compressors and condensers of the two systems, which not only wastes space in supermarkets and convenience stores, but also adds complexity of site installation.
  • the repetitive use of the condensers and the reservoirs by the two independent systems wastes raw materials and increases the hardware costs of the systems, both being disadvantageous to energy saving and cost reduction.
  • a medium- and low-temperature integrated refrigerating/freezing system may provide medium temperature refrigeration for storing foods, etc. and low temperature freeze for storing cold drinks, etc.
  • the system may comprise an integrated unit, a (group of) medium-temperature refrigerating cabinet(s), a (group of) low-temperature freezing cabinet(s) and corresponding connecting pipes.
  • the integrated unit may further comprise: a common condenser for condensing high- temperature and high-pressure gaseous refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system; a common reservoir for storing the high-temperature and high-pressure liquid refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system; a subcooling adjusting mechanism for adjusting the subcooling of the low-temperature freezing system; and a suction temperature adjusting mechanism for adjusting intake temperature of the low-temperature freezing system.
  • a common condenser for condensing high- temperature and high-pressure gaseous refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system
  • a common reservoir for storing the high-temperature and high-pressure liquid refrigerant in the medium-temperature refrigerating system and the low-temperature freezing system
  • a subcooling adjusting mechanism for adjusting the subcooling of the low-temperature freezing
  • the system may have compact structure and energy saving as well as easy installation and relatively high energy utilization efficiency.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the integrated unit further comprises a (group of) medium-temperature compressor(s) and a (group of) low-temperature compressor(s).
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the medium-temperature refrigerating cabinet and the low-temperature freezing cabinet comprise respectively an evaporator, an expansion valve and a product cabinet for food placement.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the suction ends of the (group of) medium-temperature compressor(s) and the (group of) low-temperature compressor(s) are respectively connected to the evaporators of the medium-temperature refrigerating cabinet and the low-temperature freezing cabinet, and the exhaust ends thereof are jointly connected to the inlet end of the common condenser.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the outlet end of the common condenser is connected to the inlet end of the reservoir.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the expansion valve in the integrated unit, an intermediate heat exchanger and the corresponding connecting pipes form the subcooling adjusting mechanism.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which a first inlet end of the intermediate heat exchanger of the subcooling adjusting mechanism is directly connected to the reservoir, and a second inlet end of the intermediate heat exchanger of the subcooling adjusting mechanism is connected to the reservoir via the expansion valve.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which a first outlet end of the intermediate heat exchanger is connected to the inlet end of the low-temperature freezing cabinet.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the suction temperature adjusting mechanism comprises a first branch connecting the second outlet end of the intermediate heat exchanger with the suction end of the medium-temperature compressor, and a second branch connecting the second outlet end of the intermediate heat exchanger with the suction end of the low-temperature compressor, wherein the second branch contains an adjustment valve.
  • the system may provide a medium- and low-temperature integrated refrigerating/freezing system, in which the integrated unit is connected to the medium-temperature refrigerating cabinet and the low-temperature freezing cabinet in a plug-and-play manner.
  • a refrigerating system comprises: at least one medium-temperature refrigerating device comprising at least one medium-temperature evaporator; at least one low-temperature freezing device comprising at least one low-temperature evaporator; an integrated unit comprising: at least one medium-temperature compressor connected to the medium-temperature evaporator; at least one low-temperature compressor connected to the low-temperature evaporator; a condenser connected to the exhaust ends of the at least one medium-temperature compressor and the at least one low-temperature compressor for condensing the high-temperature and high-pressure gaseous refrigerant exhausted from the exhaust ends of the at least one medium-temperature compressor and the at least one low-temperature compressor; a reservoir connected to the condenser for storing the high-temperature and high-pressure liquid refrigerant exhausted from the condenser; a subcooling adjusting mechanism connected with the reservoir and to the low-temperature evaporator for adjusting the subcooling
  • the system may provide a refrigerating system, in which the subcooling adjusting mechanism comprises an intermediate heat exchanger connected to the low-temperature evaporator, a first inlet end of the intermediate heat exchanger is directly connected to the reservoir, and a second inlet end thereof is connected to the reservoir via an expansion valve.
  • the system may provide a refrigerating system, in which the first outlet end of the intermediate heat exchanger is connected to the low- temperature evaporator of the low-temperature freezing device.
  • the system may provide a refrigerating system, in which the suction temperature adjusting mechanism comprises a first branch connecting the second outlet end of the intermediate heat exchanger with the suction end of the medium-temperature compressor, and a second branch connecting the second outlet end of the intermediate heat exchanger with the suction end of the low-temperature compressor, wherein the second branch contains an adjustment valve.
  • the system may be implemented to effectively reduce installation space for the freezing system.
  • a plug-and-play connection may be employed to facilitate the system's site installation and later adjustments and maintenance.
  • the integrated design may optimize the layout of the pipelines.
  • the whole system may offer simplified hardware structure and high performance.
  • Figure 1 is a schematic diagram of the structure of a prior art medium-temperature refrigerating system.
  • Figure 2 is a schematic diagram of the structure of a prior art low-temperature freezing system.
  • Figure 3 is a schematic diagram of the structure of an embodiment of the present medium- and low-temperature integrated refrigerating/freezing system.
  • Figure 4 is a schematic diagram of the structure of the medium- and low-temperature refrigerating/freezing cabinet of the system of Figure 3.
  • an embodiment of a medium- and low-temperature integrated refrigerating/freezing system 40 mainly comprises an integrated unit 41, a low-temperature freezing cabinet 42, a medium-temperature refrigerating cabinet 43 and connecting pipes 44.
  • the integrated unit 41 has two inlet ends (inlets) 102, 104 and two outlet ends (outlets) 101, 103.
  • the housing of the low-temperature freezing cabinet 42 is provided with an inlet end and an outlet end.
  • the housing of the medium- temperature refrigerating cabinet 43 is provided with an inlet end and an outlet end.
  • the integrated unit 41 comprises a housing 51 , a low-temperature compressor 52, a medium-temperature compressor 53, a heat rejection heat exchanger (condenser) 54, a reservoir 55, an intermediate heat exchanger 56, an expansion device (e.g., valve) 17, an adjustment valve 58, and the associated connecting pipes 44.
  • the housing 51 of the integrated unit 41 can be a sealed box, and it can also have doors or other similar structures for installing/removing/accessing the low-temperature compressor 52, the medium-temperature compressor 53, the condenser 54, the reservoir 55, the intermediate heat exchanger 56 and the associated connecting pipes 44.
  • the housing 51 may have shock absorption feet (not shown), and the housing 51 can be designed into a shock-proof and noise-proof structure for improving system performance of the integrated unit 41 and for increasing system stability.
  • each of the elements may be arranged for convenient connection between the elements and for laying out the connecting pipes 44.
  • the integrated unit may be a roof-mounted or other remote unit. Although shown connected to a single medium temperature evaporator and cabinet and a single low temperature evaporator and cabinet, a given integrated unit may be connected to multiple such medium temperature evaporators and/or cabinets and/or multiple low temperature evaporators and/or cabinets. Also, each integrated unit may have multiple such medium temperature compressors and/or low temperature compressors in respective compressor sets.
  • the low-temperature freezing cabinet 42 may be similar to the medium-temperature refrigerating cabinet 43.
  • Each cabinet 42, 43 (FIG. 4) comprises a product cabinet 61 and a refrigerating device area 62.
  • the product cabinet 61 can be designed into a structure suitable for storage of foods and convenient for people to access, such as an open structure or a compartment structure having one or more doors 65.
  • the refrigerating device area 62 is used for providing refrigerating air to the product cabinet 61.
  • the refrigerating device area 62 includes an expansion device (e.g., valve) 63, heat absorption heat exchanger (e.g., evaporator) 64 and associated connecting pipes 44.
  • a fan (not shown) may also be provided to drive an airflow across the evaporator 64 and through the product cabinet 61.
  • the cabinets may be rooms of a building or separate display or storage cases.
  • FIG. 3 The connection of the whole medium- and low-temperature integrated refrigerating/freezing system 40 is shown in Fig. 3, in which the outlet end 101 of the integrated unit 41 is connected to the inlet end of the low-temperature freezing cabinet 42 via the associated connecting pipes 44, the outlet end of the low- temperature freezing cabinet 42 is connected to the inlet end 102 of the of the integrated unit 41 via the connecting pipes 44.
  • the outlet end 103 of the integrated unit 41 is connected to the inlet end of the medium- temperature refrigerating cabinet 43 via the associated connecting pipes 44, and the outlet end of the medium- temperature refrigerating cabinet 43 is connected to the inlet end 104 of the of the integrated unit 41 via the associated connecting pipes 44.
  • the integrated unit 41 may be connected in a plug-and-play manner to the medium-temperature refrigerating cabinet 43 and the low-temperature freezing cabinet 42 to facilitate site installation and operation.
  • the suction (inlet/intake/low pressure) end of the low-temperature compressor 52 is connected to the inlet end 102 of the of the integrated unit 41 via the associated connecting pipes 44, the suction end of the medium- temperature compressor 53 is connected to the inlet end 104 of the of the integrated unit 41 via the associated connecting pipes 44, thereby providing the respective connections of the medium- temperature compressor 53 and the low-temperature compressor 52 to the evaporators 64 within the medium-temperature refrigerating cabinet 43 and the low-temperature freezing cabinet 42.
  • the exhaust (outlet/discharge/high pressure) end of the low-temperature compressor 52 merges with the exhaust end of the medium- temperature compressor 53 via the associated connecting pipes 44 and is connected to the inlet end of the condenser 54 via the associated connecting pipes 44.
  • the outlet end of the condenser 54 is connected to the inlet end of the reservoir 55 via the connecting pipes 44.
  • the outlet end of the reservoir 55 is branched into three flow paths/branches (formed by associated components including the connecting pipes 44) 71, 72, and 73.
  • the outlet end of the reservoir 55 is directly connected to the inlet end of the medium- temperature refrigerating cabinet 43 via the associated connecting pipes 44, thereby realizing connection of the outlet end of the reservoir 55 with the expansion valve 63 within the medium-temperature refrigerating cabinet 43.
  • the outlet end of the reservoir 55 is connected with the first inlet end of the intermediate heat exchanger 56, and is connected with the inlet end of the low-temperature freezing cabinet via the associated connecting pipes 44 at the first outlet end of the intermediate heat exchanger 56, thereby realizing the connection of the outlet end of the reservoir 55 with the expansion valve 63 within the medium-temperature refrigerating cabinet 43 via the first branch/segment 75 of the intermediate heat exchanger 56.
  • the outlet end of the reservoir 55 is connected to the inlet end of the expansion valve 57 via the associated connecting pipes 44, and is connected with the second inlet end of the intermediate heat exchanger 56 via the associated connecting pipes 44 at the outlet end of the expansion valve 57.
  • the flow path 73 continues through the second branch/segment 76 of the intermediate heat exchanger 56.
  • the second branch/segment 76 is in heat exchange relation with the first branch/segment 75.
  • the second outlet end of the intermediate heat exchanger 56 is divided into two branches 431, 432. In the first branch 431 the second outlet end of the intermediate heat exchanger 56 merges with the outlet end of the refrigerating cabinet 43 via the associated connecting pipes 44 and is directly connected to the suction end of the medium-temperature compressor 53.
  • the second outlet end of the intermediate heat exchanger 56 is first connected to the adjustment valve 58 via the associated connecting pipes 44, and then merges with the outlet end of the low-temperature freezing cabinet 42 via the connecting pipes 44 for connecting to the suction end of the low-temperature compressor 52.
  • the low-temperature and low-pressure gaseous refrigerant flowing out of the outlet ends of the medium-temperature refrigerating cabinet 43 and the low-temperature freezing cabinet 42 flows into the medium-temperature compressor 53 and the low-temperature compressor 52 respectively, and they are compressed into high-temperature and high-pressure gas, and then merge together and flow together into the condenser 54.
  • the high-temperature and high-pressure gaseous refrigerant becomes high- temperature and high-pressure liquid refrigerant after having released heat to the ambient and flows into the reservoir 55.
  • the high-temperature and high-pressure liquid refrigerant flows into the expansion valve 63 within the medium-temperature refrigerating cabinet 43 via the associated connecting pipes 44, changes into a low-temperature and low-pressure liquid after throttling and pressure decreasing through the expansion valve 63, flows through the coiled pipes in the evaporator 64 within the medium-temperature refrigerating cabinet 43 and exchanges heat with the air on the surface of the coiled pipes to generate medium-temperature cold air in order to transform the low-temperature and low-pressure liquid refrigerant into low-temperature and low-pressure gaseous refrigerant, and to flow back into the medium-temperature compressor 53, thus forming a circulating loop of the medium-temperature system.
  • the high-temperature and high-pressure liquid refrigerant at the outlet end of the reservoir 55 flows through the intermediate heat exchanger 56.
  • the high-temperature and high-pressure liquid refrigerant at the outlet end of the reservoir 55 is first changed into the low-temperature and low-pressure liquid refrigerant via pressure-deceasing throttling via the expansion valve, and then flows through the intermediate heat exchanger 56.
  • the two refrigerant flows in the flow paths 72, 73 at different temperatures exchange heat in the intermediate heat exchanger 56.
  • the high-temperature and high-pressure liquid refrigerant in the flow path 72 releases heat in the intermediate heat exchanger 56, making the high-temperature and high-pressure liquid refrigerant pre-cooled before flowing into the low-temperature freezing cabinet 42, thereby effectively adjusting the subcooling of the low-temperature freezing system so as to improve refrigerating effects and performance of the low-temperature freezing system.
  • the pre-cooled refrigerant enters into the expansion valve 63 of the low-temperature freezing cabinet 42 for throttling to change into the low-temperature and low-pressure liquid refrigerant, flows into the coiled pipes within the evaporator 64 and exchanges heat with the ambient air to supply low-temperature cold air.
  • the heat-absorbed gaseous refrigerant flows back into the low-temperature compressor 52 to form a circulating loop of the low-temperature freezing system.
  • the low-temperature and low-pressure liquid refrigerant in the flow path 73 absorbs heat within the intermediate heat exchanger 56 to change into the low-temperature and low-pressure gaseous refrigerant.
  • the low- temperature and low-pressure gaseous refrigerant merges directly with the low-temperature and low-pressure gaseous refrigerant flowing out of the medium-temperature refrigerating cabinet 43 and flows into the medium-temperature compressor 53.
  • the low-temperature and low-pressure gaseous refrigerant first flows through the adjustment valve 58, merges with the low-temperature and low-pressure gaseous refrigerant flowing out of the low-temperature freezing cabinet 42 and then flows into the low-temperature compressor 52, thereby effectively adjusting the suction temperature of the low-temperature compressor via the adjustment valve 58 and protecting the low-temperature compressor 42.
  • Control may be automatic via a controller (e.g., an electronic control system such as a microcontroller) responsive to sensor (not shown) input and any user-set or user-input parameters or commands.
  • the medium- and low-temperature integrated refrigerating/freezing system of the present invention comprises the integrated unit 41, the (group of) medium-temperature refrigerating cabinet(s) 42, the (group of) low-temperature freezing cabinet(s) 43 and the connecting pipes 44.
  • the medium- and low-temperature freezing systems share one condenser 54 and the reservoir 55;
  • the expansion valve 57, the intermediate heat exchanger 56 and the corresponding connecting pipes 44 form the subcooling adjusting mechanism of the low-temperature freezing system for adjusting subcooling of the low-temperature freezing system and improving the overall performance and the stability of the low-temperature freezing system;
  • the expansion valve 57, the intermediate heat exchanger 56, the adjustment valve 58 and the corresponding connecting pipes 44 further form an suction temperature adjusting mechanism for the low-temperature freezing system for lowering the suction temperature of the low-temperature freezing system in order to better protect the low-temperature compressor 52.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

Cette invention se rapporte à un système de réfrigération/congélation intégré à températures moyennes et basses (40) qui comprend une unité intégrée (41), une armoire frigorifique à température moyenne (43), une armoire de congélation à basse température (42) et des tuyaux de raccordement correspondants (44). L'unité intégrée (41) comprend en outre un condenseur commun (54) pour condenser le réfrigérant gazeux haute température et haute pression dans le système de réfrigération à température moyenne et dans le système de congélation à basse température, un réservoir commun (55) pour le stockage du réfrigérant liquide haute température et haute pression dans le système de réfrigération à température moyenne et le système de congélation à basse température, un mécanisme de réglage du sous-refroidissement (56, 57) pour régler le degré de sous-refroidissement dans le système de congélation à basse température et un mécanisme de réglage de température d'aspiration (431, 432, 58) pour régler la température d'aspiration du système de congélation à basse température.
PCT/US2008/080297 2007-10-17 2008-10-17 Système de réfrigération/congélation intégré à températures moyennes et basses WO2009052368A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08839645.2A EP2198211A4 (fr) 2007-10-17 2008-10-17 Système de réfrigération/congélation intégré à températures moyennes et basses
US12/680,984 US20100212350A1 (en) 2007-10-17 2008-10-17 Medium- and Low-Temperature Integrated Refrigerating/Freezing System

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710181324.X 2007-10-17
CNA200710181324XA CN101413738A (zh) 2007-10-17 2007-10-17 一种中低温集成式冷藏/冷冻系统

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WO2009052368A1 true WO2009052368A1 (fr) 2009-04-23

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US (1) US20100212350A1 (fr)
EP (1) EP2198211A4 (fr)
CN (1) CN101413738A (fr)
WO (1) WO2009052368A1 (fr)

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US9541311B2 (en) 2010-11-17 2017-01-10 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9657977B2 (en) 2010-11-17 2017-05-23 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
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