EP0485147B1 - Système de réfrigération - Google Patents

Système de réfrigération Download PDF

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Publication number
EP0485147B1
EP0485147B1 EP19910310187 EP91310187A EP0485147B1 EP 0485147 B1 EP0485147 B1 EP 0485147B1 EP 19910310187 EP19910310187 EP 19910310187 EP 91310187 A EP91310187 A EP 91310187A EP 0485147 B1 EP0485147 B1 EP 0485147B1
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EP
European Patent Office
Prior art keywords
evaporator
conduit
refrigerant
heat transfer
evaporators
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Expired - Lifetime
Application number
EP19910310187
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German (de)
English (en)
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EP0485147A1 (fr
Inventor
Heinz Jaster, (Nmn)
Leroy John Herbst
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General Electric Co
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General Electric Co
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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
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • 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
    • 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
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/052—Compression system with heat exchange between particular parts of the system between the capillary tube and another part 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
    • 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
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/054—Compression system with heat exchange between particular parts of the system between the suction tube of the compressor and another part of the 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
    • 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
    • F25B2400/23—Separators

Definitions

  • the present invention generally relates to refrigeration systems and, more particularly, relates to heat transfer configurations for refrigeration systems including a plurality of evaporators and a compressor unit.
  • refrigerant In a typical refrigeration system, refrigerant circulates continuously through a closed circuit.
  • circuit refers to a physical apparatus whereas the term “cycle” as used herein refers to operation of a circuit, e.g., refrigerant cycles in a refrigeration circuit.
  • refrigerant refers to refrigerant in a liquid, vapor and/or gas form. Components of the closed circuit cause the refrigerant to undergo temperature/pressure changes. The temperature/pressure changes of the refrigerant result in energy transfer.
  • Typical components of a refrigeration system include, for example, compressors, condensers, evaporators, control valves, and connecting piping. Details with regard to some known refrigeration systems are set forth in Baumeister et al., Standard Handbook for Mechanical Engineers, McGraw Hill Book Company, Eighth Edition, 1979. beginning at page 19-6.
  • Energy efficiency is one important factor in the implementation of refrigeration systems.
  • an ideal refrigeration system provides an ideal refrigeration effect.
  • an actual refrigeration system provides an actual refrigeration effect less than the ideal refrigeration effect.
  • the actual refrigeration effect provided varies from system to system.
  • Increased energy efficiency typically is achieved by utilizing more expensive and more efficient refrigeration system components, adding extra insulation adjacent to the area to be refrigerated, or by other costly additions. Increasing the energy efficiency of a refrigeration system therefore usually results in an increase in the cost of the system. It is desirable, of course, to increase the efficiency of a refrigeration system and minimize any increase in the cost of the system.
  • a typical household refrigerator which includes a freezer compartment and a fresh food compartment, is one example of such an apparatus.
  • the freezer compartment preferably is maintained between -23°C (-10° Fahrenheit (F)) and -9°C (+15°F) and the fresh food compartment preferably is maintained between 0.5°C and 8°C (+33°F and +47°F),
  • a typical refrigeration system includes a compressor coupled to an evaporator disposed within the household refrigerator.
  • the terms "coupled” and “connected” are used herein interchangeably. When two components are coupled or connected, this means that the components are linked, directly or indirectly in some manner in refrigerant flow relationship. Another component or other components can be intervening between coupled or connected components. For example, even though other components such as a pressure sensor or an expander are connected or coupled in the link between the compressor and evaporator, the compressor and evaporator are still coupled or connected.
  • the evaporator is operated so that it is maintained at approximately -23°C (-10°F)(an actual range of approximately -34°C to -18°C (-30°F to 0°F) typically is used) and air is blown across the coils of the evaporator.
  • the flow of the evaporator-cooled air is controlled, for example, by barriers. A first portion of the evaporator-cooled air is directed to the freezer compartment and a second portion of the evaporator-cooled air is directed to the fresh food compartment.
  • Refrigeration systems which reduce energy use are described in commonly assigned U.S. -A- 4,910,972 and US-A- 4,918,942.
  • the patented systems utilize at least two evaporators and a plurality of compressors or a compressor having a plurality of stages.
  • a first evaporator operates at -4°C (+25°F) and a second evaporator operates at -23°C (-10°F)
  • Air cooled by the first evaporator is utilized for the fresh food compartment and air cooled by the second evaporator is utilized for the freezer compartment.
  • Utilizing the dual evaporator refrigeration system in a household refrigerator results in increased energy efficiency.
  • a plurality of compressors or a compressor including a plurality of stages are utilized. Utilizing a plurality of compressors or utilizing a compressor having a plurality of stages results in increasing the cost of the refrigeration system over the cost, at least initially, of refrigeration systems utilizing one evaporator and one single stage compressor.
  • GB-A-639691 discloses a refrigeration system with two evaporators and a flow controller alternately connnecting either one of the evaporators with the compressor.
  • the refrigeration system described in EP-A-0 485 14-6 comprises a refrigerant flow control unit and a compressor unit.
  • the compressor unit is a single stage compressor.
  • the refrigerant flow control unit is coupled to a plurality of input conduits.
  • Each conduit in the exemplification embodiment, has refrigerant disposed therein, and each respective refrigerant is at a respective pressure.
  • a first input to the control unit is a high pressure refrigerant and a second input to the control unit is a low pressure refrigerant.
  • the outlet of the refrigerant flow control unit is coupled to the inlet of the compressor unit.
  • the respective refrigerants are provided as inputs to the control unit as described above, and the control unit provides that each respective refrigerant flows, alternately, to the compressor unit.
  • the refrigerant flow timing i.e., the length of time each input refrigerant is allowed to flow to the compressor unit, is determined on a straight timed basis or in accordance with measurable physical attributes, such as the respective pressures, temperatures, densities, and/or flow rates of the respective refrigerants.
  • Some of the lost cooling capacity is regained by disposing the conduit, i.e., the suction line, connected to the outlet of the freezer evaporator in a heat transfer arrangement with the conduit connected to the outlet of the condenser. Refrigerant liquid exiting the condenser is further subcooled as a result of the heat transfer arrangement thereby decreasing the enthalpy of the refrigerant before expansion in the fresh food evaporator.
  • This heat transfer effectively shifts the specific cooling capacity, i.e., [(mass flow) x (enthalpy change)], regain from the freezer evaporator to the fresh food evaporator.
  • Another object of the present invention is to provide regain of cooling capacity in an evaporator which operates at a low temperature in a refrigeration system.
  • Still another object of the present invention is to decrease the mechanical energy required to operate a refrigeration system having a plurality of evaporators.
  • US-A-4918942 discloses a refrigeration circuit according to the preamble of claim 1. The present invention is characterised by
  • the present invention is believed to have greatest utility in refrigeration systems having more than one evaporator, such as a refrigeration system including a fresh food evaporator and a freezer evaporator. More particularly, one embodiment of the present invention comprises disposing a capillary tube, connected to the inlet of the freezer evaporator, in a heat transfer relationship with the freezer evaporator suction line, e.g., a conduit connected between the outlet of the freezer evaporator and the inlet of the compressor unit.
  • a capillary tube connected to the inlet of the freezer evaporator, in a heat transfer relationship with the freezer evaporator suction line, e.g., a conduit connected between the outlet of the freezer evaporator and the inlet of the compressor unit.
  • An exemplification refrigeration system having a plurality of evaporators includes a condenser coupled to the outlet of a compressor unit.
  • the compressor unit is a single-stage compressor.
  • a first evaporator is coupled through a first expansion device to receive the refrigerant discharged from the condenser.
  • the outlet of the first evaporator is coupled to a phase separator which separates refrigerant output from the first evaporator into liquid and vapor.
  • a vapor outlet from the phase separator is coupled to a first inlet of a refrigerant flow control unit.
  • the outlet of the refrigerant flow control unit is coupled to the inlet of the compressor unit.
  • a liquid outlet from the phase separator is coupled to a second expansion device.
  • the second expansion device is a capillary tube.
  • the outlet of the capillary tube is coupled to the inlet of a second evaporator.
  • the outlet of the second evaporator is coupled to a second inlet of the refrigerant flow control unit.
  • the capillary tube coupled to the inlet of the second evaporator is disposed in a heat transfer relationship with the conduit, i.e., the second evaporator suction line, connecting the outlet of the second evaporator to the second inlet of the refrigerant flow control unit.
  • the capillary tube and the second evaporator suction line preferably are disposed in a counterflow heat exchange arrangement wherein refrigerant flowing in the capillary tube proceeds in a direction opposite to the flow of refrigerant in the second evaporator suction line.
  • the refrigerant flow control unit allows refrigerant received at its first and second inlets to alternately flow to the compressor unit.
  • the compressor unit compresses each refrigerant flow to a same pressure.
  • the refrigerant, or at least portions of the refrigerant circulates through the refrigeration system to bring about energy transfer.
  • the first evaporator operates between -9°C and 0°C (+15°F and +32°F)in order to refrigerate the fresh food compartement to between 0.5°C and 8°C (+33°F and +47°F).
  • the second evaporator operates between -34°C (-30°F) and -18°C (0°F) in order to refrigerate the freezer compartement to between -23°C (-10°F) and -9°C (+15°F),
  • the heat exchange configuration between the capillary tube and the second evaporator suction line provides a specific cooling capacity increase, or regain, in the second evaporator.
  • the term “specific” means “per unit mass flow rate”.
  • the specific cooling capacity increase in the second evaporator also provides that less mechanical energy is required to operate the second evaporator at low temperatures.
  • the present invention as described herein, is believed to have its greatest utility in refrigeration systems and particularly in household refrigerator/freezers.
  • the present invention has utility in other refrigeration applications such as multiple air conditioner units.
  • the term refrigeration systems, as used herein, therefore not only refers to refrigerator/freezers but also to many other types of refrigeration applications.
  • a first embodiment 100 of a refrigeration system is shown in Figure 1.
  • the system 100 comprises a compressor unit 102 coupled to a condenser 104.
  • a first capillary tube 106 is coupled to the outlet of the condenser 104.
  • a filter/dryer 105 known in the art as a "pickle" is disposed in the refrigerant flow path between the condenser 104 and the capillary tube 106.
  • the pickle 105 filters out particulates from the refrigerant and absorbs moisture.
  • a first evaporator 108 is shown coupled to the outlet of the first capillary tube 106.
  • the outlet of the first evaporator 108 is coupled to the inlet of a phase separator 110.
  • the phase separator 110 includes a screen 112 disposed adjacent the phase separator inlet, a vapor portion 114 and a liquid portion 116.
  • the phase separator vapor portion 114 is coupled, as a first input, to a refrigerant flow control unit 118.
  • a conduit 120 extends from the phase separator vapor portion 114 to the control unit 118 and the conduit 120 is arranged within the phase separator 110 so that liquid refrigerant entering the phase separator vapor portion 114 passes through the vapor portion 114 and cannot enter the open end of the conduit 120.
  • the outlet of the phase separator liquid portion 116 is coupled to a second capillary tube 122.
  • a second evaporator 124 is coupled to the outlet of the second capillary tube 122, and the outlet of the second evaporator 124 is coupled, as a second input, to the refrigerant flow control unit 118.
  • the outlet of the refrigerant flow control unit 118 is coupled to the compressor unit 102.
  • a thermostat 126 which receives current flow from an external power source designated by the legend "POWER IN" 128, is connected to the compressor unit 102. When cooling is required, the thermostat output signal provides for activation of the compressor unit 102.
  • the thermostat 126 typically is disposed in the freezer compartment of the refrigerator.
  • the compressor unit 102 operates only when the thermostat 126 indicates a need for cooling.
  • the configuration of the control unit 118 dictates refrigerant flow through the respective evaporators as hereinafter described.
  • the evaporators 108 and 124 shown in Fig. 1 preferably are spine fin evaporators which are well known in the art and the compressor unit 102 preferably is a rotary type compressor.
  • the evaporators 108 and 124 for example, are disposed in the fresh food compartment and the freezer compartment, respectively, of a household refrigerator.
  • the evaporators 108 and 124 preferably are positioned so that gravity forces drain any excess liquid refrigerant out of the evaporators.
  • the subject matter of the present invention is specifically directed to the heat transfer configuration shown, as one embodiment, between the second capillary tube 122 and the conduit 130, i.e., the suction line of the second evaporator 124.
  • the second capillary tube 122 is disposed in a counterflow heat transfer arrangement with the conduit 130. More specifically, the second capillary tube 122 is in thermal contact with the conduit 130. Thermal contact is achieved, for example, by soldering the exterior of the capillary tube 122 and a portion of the conduit 130 together side-by-side.
  • the capillary tube 122 is shown as being wrapped around the conduit 130 as a schematic representation of a heat transfer relationship.
  • the heat transfer occurs in a counterflow arrangement, i.e., the refrigerant flowing in the capillary tube 122 proceeds in a direction opposite to the flow of refrigerant in the conduit 130.
  • a counterflow heat exchange arrangement rather than a heat exchange arrangement wherein the flows proceed in a same direction, increases the heat exchange efficiency. Further details with regard to the advantages obtained with the present heat transfer configuration are provided with respect to Figures 4A and B. It is contemplated that the capillary tube 122, in another embodiment (not shown), is disposed so that the flows through the capillary tube 122 and the conduit 130 proceed in the same direction.
  • the first capillary tube 106 is disposed in a counterflow heat exchange arrangement with the conduits 120 and 130. Thermal contact is achieved, for example, by soldering the exterior of the capillary tube 106 and a portion of the exterior of the conduits 120 and 130 together side-by-side.
  • the capillary tube 106 is shown as being wrapped around the conduits 120 and 130 as a schematic representation of a heat transfer relationship. The heat transfer occurs in a counterflow arrangement, i.e., the refrigerant flowing in the capillary tube 106 proceeds in a direction opposite to the flow of refrigerant in the conduits 120 and 130.
  • the system 100 includes an accumulator 134.
  • the accumulator 134 is disposed at the exit of the second evaporator 124 and within the freezer compartment.
  • a pressure sensor 138 also is illustrated in Figure 1.
  • the pressure sensor 138 is disposed in a position to generate a signal representative of the pressure of refrigerant flowing in the conduit 120 and between the capillary tube 106 and the conduit 120 heat exchange arrangement and the control unit 118.
  • the output signal from the pressure sensor 138 is used to control operation of the control unit 118 as hereinafter described.
  • the accumulator 134 receives refrigerant discharged from the second evaporator 124 and supplies vapor refrigerant to the compressor unit 102, via the control unit 118.
  • An internal transport line bleeder hole 136 is provided to prevent lubricant hold-up when cycle conditions change, e.g., when superheated vapor is discharged from the second evaporator 124.
  • the second evaporator 124 When the second evaporator 124 operates at lower than specification temperatures. such as due to decreased thermal load or due to compartment thermostat setting for example, some liquid is discharged from the second evaporator 124.
  • the accumulator 134 prevents a loss of cooling capacity which would result from evaporation, in the conduit 130, of liquid discharged from the second evaporator 124. Particularly, liquid discharged from the second evaporator 124 is stored in the accumulator 134. Vapor discharged from the second evaporator 124 passes through the conduit 130. When refrigerant flowing from the second evaporator 124 is superheated, then the refrigerant liquid stored within the accumulator 134 is evaporated in the accumulator 134 and passes through the conduit 130. In this manner, the accumulator 134 facilitates preventing a loss of the cooling capacity of the second evaporator 124.
  • the flow control unit 118 is schematically shown in more detail in Figure 3.
  • the two input conduits 120 and 130 are integrally formed with the control unit 118.
  • the output conduit 132 also is shown integrally formed with the control unit 118.
  • the input conduits 120 and 130 and the output conduit 132 are coupled to inlets and an outlet, respectively, of the unit 118 such as by welding, soldering, mechanical couplers, etc.
  • the control unit 118 includes a controllable valve 140 which comprises a solenoid operated valve.
  • a solenoid controlled valve is available, for example, from ISI Fluid Power Inc., Fraser, Michigan. The valve from ISI Fluid Power Inc.
  • the controllable valve 140 is used for controlling fluid flow through the input conduit 120 which typically carries a higher pressure refrigerant than the conduit 130.
  • a check valve 142 is disposed within the input conduit 130.
  • the check valve 142 includes a ball 144, a seat 146, and a cage 148.
  • timing for the opening and closing of the controllable valve 140 is provided via the pressure sensor 138 ( Figure 1). Timed power output from the pressure sensor 138 to the solenoid of the controllable valve 140 is determined by the pressure of the refrigerant in the conduit 120.
  • the valve 140 When the valve 140 is closed, the low pressure refrigerant in the conduit 130 forces the check valve 142 open and the low pressure refrigerant flows from the conduit 130 to the output conduit 132. This condition is referred to herein as STATE 1.
  • the valve 140 opens thereby allowing refrigerant to flow therethrough, the high pressure refrigerant from the conduit 120 causes the check valve 142 to close and remain closed while the high pressure refrigerant is flowing from the conduit 120 to the output conduit 132. This condition is referred to herein as STATE 2.
  • refrigerant at about 1.4 kg/cm 2 (20 pounds per square inch absolute (psia)) is disposed in the conduit 130 and refrigerant at about 2.8 kg/cm 2 (40 psia) is disposed in the conduit 120.
  • the inlet pressure to the compressor unit 102 when the control unit 118 is in STATE 1 is approximately 1.4 kg/cm 2 (20 psia).
  • the compressor unit inlet pressure is approximately 40 psia.
  • the pressure switch 138 is used to control the particular state or configuration of the control unit 118. For example, if it is preferred to maintain the refrigerant in the first evaporator 108 at approximately 1°C (+34°F), a temperature range of approximately -3°C (+26°F) to 2°C (+36°F) is a suitable range for the temperature of the refrigerant in the first evaporator 108.
  • a temperature range of approximately -3°C (+26°F) to 2°C (+36°F) is a suitable range for the temperature of the refrigerant in the first evaporator 108.
  • the pressure sensor output signal activates the control unit 118, such as by activating the controllable valve 140, so that flow communication is established between the conduit 120 and the conduit 132, i.e., STATE 2.
  • the thermostat 126 cuts-off power to the compressor unit 102.
  • the compressor unit 102 is not activated, regardless of the configuration of the control unit 118, substantially no refrigeration effect is provided to the fresh food compartment and the freezer compartment.
  • the control unit 118 When the temperature of refrigerant in the conduit 120 is above 2°C (+36°F) and the temperature of the freezer compartment is above -17°C (+2°F), the control unit 118 is disposed in STATE 2 and the compressor unit 102 is activated. Once the temperature of refrigerant within the fresh food compartment evaporator 108 is brought to below -3°C (+26°F), then the pressure sensor 138 causes the control unit 118 to transition into STATE 1. Refrigerant will then be pulled through the freezer evaporator 124 until the temperature of the freezer compartment is below -19°C (-2°F).
  • the fresh food evaporator 108 has refrigerant pulled therethrough albeit at a rate slower than the rate when the control unit 118 is in STATE 2.
  • the temperature of the refrigerant in the conduit 120 must be below 2°C (+36°F) and the temperature of the freezer compartment must be above -17°C (+2F),
  • the system 100 illustrated and described above was implemented in a General Electric Company Household Refrigerator Model No. TBX25Z with a General Electric Company No. 800 Rotary-type compressor.
  • the on-period was found to be 22.7 minutes and the off-period was found to be 33.5 minutes (40.4% on-time).
  • Respective evaporator fans (not shown) were provided to blow air across the coils of each evaporator.
  • Each fan was coupled through the thermostat 126 to the power supply, and when the thermostat 126 activated the compressor unit 102, both fans also were activated and blew air across its respective evaporator 108 and 124.
  • FIGS 4A-B respectively, illustrate temperature-enthalpy diagrams.
  • the diagram for Figure 4A is for a refrigeration circuit similar to the circuit 100 illustrated in Figure 1 but not having the capillary tube 122 and the conduit 130 disposed in a heat transfer configuration.
  • the diagram in Figure 4B is for the refrigeration circuit 100 illustrated in Figure 1 which, as shown, includes one embodiment of the present heat transfer configuration, i.e., the capillary tube 122 and the conduit 130 are disposed in a heat transfer configuration.
  • the x-axis corresponds to enthalpy (h) and the y-axis corresponds to temperature (T).
  • the circuit under analysis in Figure 4A corresponds to the circuit shown if Figure 1 with the exception that the capillary tube 122 and the conduit 130, i.e., the freezer evaporator suction line, are not disposed in a heat transfer relationship.
  • the temperature of air in the fresh food evaporator T FFair and the temperature of air in the freezer evaporator T FZair are indicated.
  • Point 1 on the diagram illustrates the state of refrigerant at the exit of the condenser 104.
  • Point 2 illustrates the state of refrigerant still within the capillary tube 106 but at the end of thermal contact with the conduits 120 and 130.
  • Point 3 illustrates the state of refrigerant between the outlet of the capillary tube 106 and the inlet of the first evaporator 106.
  • Point 4 illustrates the state of refrigerant at the outlet of the first evaporator 106.
  • Point 5 illustrates the state of the refrigerant at the outlet of the phase separator vapor portion 114.
  • Point 6 illustrates the state of the refrigerant at the outlet of the phase separator liquid portion 116.
  • Point 7 illustrates the state of the refrigerant at the outlet of the capillary tube 122 (again, the capillary tube 122, in this exemplification, is not in a heat transfer relationship with the conduit 130).
  • Point 8 illustrates the state of the refrigerant at the outlet of the accumulator 134.
  • Point 9 illustrates the state of the refrigerant within the conduit 130 at the end of thermal contact with the capillary tube 106.
  • Point 10 illustrates the state of the refrigerant from the conduit 130 at the inlet to the compression chamber of the compressor unit 102.
  • Point 11 illustrates the state of the refrigerant from the conduit 130 at the outlet of the compression chamber of the compressor unit 102.
  • Point 12 illustrates the state of the refrigerant from the conduit 130 at the outlet of the compressor motor chamber of the compressor unit 102.
  • Point 13 illustrates the state of refrigerant in the conduit 120 at the end of thermal contact with the capillary tube 106.
  • Point 14 illustrates the state of the refrigerant from the conduit 120 at the inlet of the compression chamber of the compressor unit 102.
  • Point 15 illustrates the state of the refrigerant from the conduit 120 at the outlet of the compression chamber of the compressor unit 102.
  • Point 16 illustrates the state of the refrigerant from the conduit 120 at the outlet of the compressor motor chamber of the compressor unit 102.
  • the temperature-enthalpy diagram in Figure 4A is provided to facilitate an understanding of the thermodynamic advantages provided by the present invention. Particularly, a comparison of the diagrams in Figures 4A and 4B illustrates the specific cooling capacity increase, or regain, in the freezer evaporator provided by the present invention.
  • the circuit under analysis in Figure 4B corresponds to the circuit shown if Figure 1 which, as illustrated, includes one embodiment of the present invention, i.e., the heat transfer configuration of the capillary tube 122 and the conduit 130.
  • the points and corresponding numerals indicated in Figure 4A are included in Figure 4B to facilitate a comparison of the thermodynamic characteristics.
  • the temperature of air in the fresh food evaporator T FFair and the temperature of air in the freezer evaporator T FZair are indicated.
  • Point 1 on the diagram illustrates the state of refrigerant at the exit of the condenser 104.
  • Point 2 illustrates the state of refrigerant within the capillary tube 106 at the end of thermal contact with the conduits 120 and 130.
  • Point 3 illustrates the state of refrigerant between the outlet of the capillary tube 106 and the inlet of the first evaporator 106.
  • Point 4 illustrates the state of refrigerant at the outlet of the first evaporator 106.
  • Point 5 illustrates the state of the refrigerant at the outlet of the phase separator vapor portion 114.
  • Point 6 illustrates the state of the refrigerant at the outlet of the phase separator liquid portion 116.
  • Point 7′ illustrates the state of the refrigerant at the outlet of the capillary tube 122 (note that the capillary tube, in this exemplification, is in a heat transfer relationship with the conduit 130).
  • Point 8 illustrates the state of the refrigerant at the outlet of the accumulator 134.
  • Point 9′ illustrates the state of the refrigerant within the conduit 130 at the end of thermal contact with the capillary tube 106.
  • Point 10′ illustrates the state of the refrigerant from the conduit 130 at the inlet to the compression chamber of the compressor unit 102.
  • Point 11′ illustrates the state of the refrigerant from the conduit 130 at the outlet of the compression chamber of the compressor unit 102.
  • Point 12′ illustrates the state of the refrigerant from the conduit 130 at the outlet of the compressor motor chamber of the compressor unit 102.
  • Point 13 illustrates the state of refrigerant in the conduit 120 at the end of thermal contact with the capillary tube 106.
  • Point 14 illustrates the state of the refrigerant from the conduit 120 at the inlet of the compression chamber of the compressor unit 102.
  • Point 15 illustrates the state of the refrigerant from the conduit 120 at the outlet of the compression chamber of the compressor unit 102.
  • Point 16 illustrates the state of the refrigerant from the conduit 120 at the outlet of the compressor motor chamber of the compressor unit 102.
  • the present heat transfer configuration provides for a specific cooling capacity increase in the freezer evaporator 124.
  • the increase in specific cooling capacity results in a decrease in the amount of mechanical energy required to cool the freezer evaporator.
  • Equation 1 states that the change in enthalpy ( ⁇ h a ) of refrigerant from the entrance to the exit of the capillary tube 106, which enthalpy change ( ⁇ h a ) results from the heat transfer between the capillary tube 106 and the conduits 120 and 130, equals the change in enthalpy of the refrigerant in the conduits 120 and 130 from the beginning to the end of thermal contact with the capillary tube 106.
  • the specific cooling capacity regain in the fresh food evaporator 108 is equal to [(m H )( ⁇ h a )].
  • the present invention therefore, provides an increase in the specific cooling capacity of the freezer evaporator 124 by addition of m L (h 7 - h 7' ).
  • the actual cooling capacity increase depends upon the mass flow rate of refrigerant flowing through the freezer evaporator 124.
  • the increase in cooling capacity also provides that less mechanical energy is required to cool the freezer compartment. Specifically, the compressor unit operating time required to satisfy the cooling demand of the freezer compartment is reduced because the cooling supplied by the freezer evaporator 124 is increased during operation.
  • Figure 5 is a block diagram illustration of a household refrigerator 200 including an insulated wall 202 forming a fresh food compartment 204 and a freezer compartment 206.
  • Figure 5 is provided for illustrative purposes only, and particularly to show one apparatus which has substantially separate compartments which require refrigeration at different temperatures.
  • the fresh food compartment 204 and the freezer compartment 206 typically are maintained at about 0.5°C (+33°F) to 8°C (+47°F) and -23°C (-10°F) to -9°C (+15°F), respectively.
  • a first evaporator 208 is shown disposed in the fresh food compartment 204 and a second evaporator 210 is shown disposed in the freezer compartment 206.
  • the present invention is not limited to the physical location of the evaporators, and the location of the evaporators shown in Figure 5 is only for illustrative purposes and to facilitate ease of understanding. It is contemplated that the evaporators 208 and 210 could be disposed anywhere in the household refrigerator, or even outside the refrigerator and the evaporator-cooled air from each respective evaporator is directed to the respective compartments via conduits, barriers, and the like.
  • the first and second evaporators 208 and 210 are driven by a compressor unit 212 and a condenser 214 shown located in a compressor/condenser compartment 216.
  • a temperature sensor 218, such as the thermostat 126 shown in Figure 1, is disposed in the freezer compartment 206.
  • the sensor 218, of course, preferably is user adjustable so that a system user selects a temperature, or temperature range, at which the compressor is to be activated and/or inactivated.
  • the first evaporator 208 typically is operated at between approximately -9°C (+15°F) to approximately 0°C (+32°F) and the second evaporator 210 typically is operated at approximately -34°C (-30°F) to approximately -18°C (0°F) in order to maintain the fresh food compartment 204 at between approximately 0.5°C (+33°F) to 8°C (+47°F) and the freezer compartment 206 between approximately -23°C (-10°F) to -9°C (+15°F), respectively.
  • Figure 6 illustrates a second embodiment of the present invention wherein more than two evaporators are utilized. More than two evaporators provide even further efficiencies in some contexts. For example, in some contexts, it is desired to provide a household refrigerator with a third evaporator to quickly chill or freeze selected items in a separate compartment.
  • embodiment 300 includes a compressor unit 302 coupled to a condenser 304.
  • the outlet of the condenser 304 is coupled to a first expansion valve 306 which has its outlet coupled to a first evaporator 308.
  • the outlet of the first evaporator 308 is coupled to the inlet of a first phase separator 310.
  • the first phase separator 310 includes a screen 312, a vapor portion 314 and a liquid portion 316.
  • the phase separator vapor portion 314 is coupled, as a first input, to a refrigerant flow control unit 318.
  • a conduit 320 extends from the first phase separator vapor portion 314 to the control unit 318 and the conduit 320 is arranged within the phase separator 310 so that liquid refrigerant entering the phase separator vapor portion 314 passes through the vapor portion 314 and cannot enter the open end of the conduit 320.
  • the outlet of the first phase separator liquid portion 316 is coupled to a first capillary tube 322.
  • a second evaporator 324 is coupled to the outlet of the first capillary tube 322, and the outlet of the second evaporator 324 is coupled to the inlet of a second phase separator 326.
  • the second phase separator 326 includes a screen 328, a vapor portion 330 and a liquid portion 332.
  • the phase separator vapor portion 330 is coupled, as a second input,, to the refrigerant low control unit 318.
  • a conduit 334 extends from the second phase separator vapor portion 330 to the control unit 318 and the conduit 334 is arranged within the phase separator 326 so that liquid refrigerant entering the phase separator vapor portion 330 passes through the vapor portion 330 and cannot enter the open end of the conduit 334.
  • the outlet of the second phase separaator liquid portion 332 is coupled to a second capillary tube 336.
  • a third evaporator 338 is coupled to the outlet of the second capillary tube 336, and the outlet of the third evaporator 338 is coupled, as a third input, to the refrigerant low control unit 318.
  • First and second sensors 340 and 342 are utilized for detecting physical attributes of the first and second evaporators 308 and 324, respectively, or to detect physical attributes of refrigerant lowing through the respective evaporators.
  • the sensors 340 and 342 are temperature, pressure, low rate, and/or density-type sensors.
  • Respective pressure sensors for example, are connected anywhere along the length of the evaporators 308 and 324 such as at respective evaporator outlets.
  • Respective temperature sensors preferably are placed at a location along the length of respective evaporators where two-phase refrigerant flows.
  • the first and second sensors 340 and 342 are coupled to a timer 344.
  • the timer 344 is a a variable timer.
  • a sensor switch can be utilized.
  • a fixed timer can be used to drive the control unit 318. With the fixed timer, of course, the sensors 340 and 342 are not necessary. The sensors 340 and 342 preferably are user adjustable.
  • the control unit 318 shown in Figure 6 comprises first and second controllable valves 346 and 348.
  • the valves 346 and 348 preferably are on-off solenoid valves which are well-known in the art.
  • the control unit 318 further comprises a check valve 350.
  • the first and second controllable valves 346 and 348 receive, as inputs, refrigerant flowing through the conduits 320 and 334, respectively.
  • the conduit 352. which is coupled to the third evaporator, provides input refrigerant to the check valve 350.
  • each valve of the control unit 318 alternately opens to allow refrigerant to flow through the respective evaporators to the compressor unit 302. For example, when the first valve 346 is open and the valve 348 is closed, refrigerant flows through the first evaporator 308 to the phase separator 310 and to the compressor unit 302 via the conduit 320. Refrigerant does not flow through the second or third evaporators 324 and 338 at this time.
  • refrigerant flows from the liquid portion 314 of the phase separator 310, through the expansion device 322, through the second evaporator 324, to the phase separator 326, and to the compressor unit 302 via the conduit 334. Vapor refrigerant does not flow from the first phase separator 310 or from the third evaporator 338 to the compressor unit 302 at this time. Refrigerant flows through the first evaporator 308 from the condenser 304 at this time.
  • the third valve 350 automatically opens and liquid refrigerant flows from the second phase separator liquid portion 332, through the expansion device 336, though the third evaporator 338, and to the compressor unit 302. Refrigerant also flows through the first evaporator 308 and the second evaporator 324 at this time.
  • a higher pressure refrigerant flows through the conduit 320
  • a medium pressure refrigerant flows through the conduit 334
  • a lower pressure refrigerant flows through the conduit 350.
  • the timer 344 controls the duty cycle of the control unit 318. The specific duty cycle selected depends, of course, upon the desired operating parameters of each evaporator. It will be understood that the timer 344 controls the valves 346 and 348 so that they open alternately or are both closed, but they are not concurrently open.
  • a thermostat (not shown), of course, normally is provided to control activation of the compressor unit 302.
  • the first evaporator 308 operates at a temperature higher than the operating temperatures of the second and third evaporators 310 and 338.
  • the third evaporator 338 operates at a temperature lower than the operating temperatures of the first and second evaporators 310 and 326.
  • the second evaporator 310 operates at a temperature intermediate the operating temperatures of the first and third evaporators 308 and 338.
  • the conduit 352 i.e., the suction line of the third evaporator 338
  • the conduit 352 is disposed in a counterflow heat transfer arrangement with the second capillary tube 336 and with the first capillary tube 322.
  • This embodiment of the present invention provides for regain of specific cooling cappacity in the third evaporator 338 in a manner similar to the regain in specific cooling capacity as described with reference to the embodiment of the present invention illustrated in Figure 1.
  • additional specific cooling capacity is potentially regained by disposing the conduit 352 in counterflow heat transfer arrangements with both the first capillary tube 322 and the second capillary tube 336.
  • Figure 7 illustrates a refrigeration system 400 a which is not according to the present invention.
  • the refrigeration system 400 comprises a first compressor unit 402 and a second compressor unit 404, the outlet of the first compressor unit 402 being connected to the inlet of the second compressor unit 404.
  • a first capillary tube 406 is coupled to the outlet of the second compressor unit 404, and the outlet of the first capillary tube 406 is coupled to the inlet of a first expansion device 408.
  • the outlet of the first expansion device 408 is coupled to the inlet of the first evaporator 410, and the outlet of the first evaporator 410 is coupled to the inlet of a phase separator 412.
  • the phase separator 412 includes a screen 414 disposed adjacent the phase separator inlet, a vapor portion 416 and a liquid portion 418.
  • the outlet of the vapor portion 416 is connected to the conduit 420 disposed between and coupling the first compressor unit 402 and the second compressor unit 404.
  • the liquid ponion 418 is connected to a second capillary tube 422.
  • the outlet of the second capillary tube 422 is connected to the inlet of a second evaporator 424.
  • the outlet of the second evaporator 424 is connected to an accumulator 426, and the outlet of the accumulator 426 is connected to the inlet of the first compressor unit 402 via the conduit 428.
  • the accumulator 426 operates in a manner similar to operation of the accumulator 134 illustrated in Figure 1. Particularly, the accumulator 426 is identical to the accumulator 134 illustrated in more detail in Figure 2. Liquid refrigerant discharged from the second evaporator 424 is stored within the accumulator 426 until the liquid refrigerant is evaporated such as by superheated refrigerant being discharged from the second evaporator 124.
  • This refrigeration system provides for regain of specific cooling capacity in the second evaporator 424 in a manner similar to the regain in specific cooling capacity as described with reference to the embodiment of the present invention illustrated in Figure 1. Particularly, by disposing the conduit 428 in a counterflow heat transfer arrangement with the capillary tube 422, specific cooling capacity regain in the second evaporator 424 is provided.
  • the embodiment 400 in Figure 7 is provided primarily to illustrate a refrigeration circuit including a plurality of compressors or a compressor having a plurality of stages.

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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)

Claims (8)

  1. Circuit de réfrigération comprenant:
    un compresseur;
    une pluralité d'évaporateurs, un premier desdits évaporateurs étant agencé pour fonctionner à une température inférieure à la température de fonctionnement d'un autre desdits évaporateurs;
    un premier conduit raccordé à l'entrée dudit premier évaporateur; et
    un second conduit raccordé à la sortie dudit premier évaporateur, ledit second conduit étant au moins partiellement disposé en vue d'un premier transfert de chaleur avec ledit premier conduit, caractérisé par:
    un régulateur d'écoulement raccordé de manière à recevoir au moins une partie du réfrigérant déchargé de chacun desdits évaporateurs, ledit régulateur d'écoulement pouvant être actionné de façon répétée pour raccorder alternativement chacun desdits évaporateurs, à raison d'un seul à la fois, de manière qu'il se trouve dans un état d'écoulement exclusif de réfrigérant vis-à-vis dudit compresseur;
    ledit régulateur d'écoulement comprenant une vanne commandée disposée dans le conduit raccordant le régulateur à l'évaporateur à température plus élevée et un clapet de non retour disposé dans le conduit raccordant le régulateur à l'évaporateur à température plus basse.
  2. Circuit de réfrigération selon la revendication 1, dans lequel:
    un condenseur est raccordé de manière à recevoir du réfrigérant déchargé dudit compresseur;
    la pluralité d'évaporateurs comprend un premier évaporateur raccordé de manière à recevoir au moins une partie du réfrigérant déchargé dudit condenseur; et
    un second évaporateur raccordé de manière à recevoir au moins une partie du réfrigérant déchargé dudit premier évaporateur;
    le second conduit raccorde la sortie dudit second évaporateur audit moyen de régulation d'écoulement; et
    un troisième conduit raccorde ledit condenseur à l'entrée dudit premier évaporateur.
  3. Circuit de réfrigération selon la revendication 1 ou 2, dans lequel ledit premier agencement de transfert de chaleur est un agencement de transfert de chaleur à contre-courant.
  4. Circuit de réfrigération selon la revendication 1, 2 ou 3, dans lequel ledit second conduit comprend un accumulateur disposé dans le circuit d'écoulement de réfrigérant entre ledit premier évaporateur et ledit premier agencement de transfert de chaleur.
  5. Circuit de réfrigération selon l'une quelconque des revendications 1 à 4, dans lequel ledit premier conduit comprend un tube capillaire formant au moins une partie dudit premier agencement de transfert de chaleur.
  6. Circuit de réfrigération selon l'une quelconque des revendications 1 à 5, comprenant, en outre, un troisième conduit raccordé à l'entrée dudit autre desdits évaporateurs, ledit second conduit étant au moins partiellement disposé dans un second agencement de transfert de chaleur avec ledit troisième conduit.
  7. Circuit de réfrigération selon la revendication 6, dans lequel ledit second agencement de transfert de chaleur est un agencement de transfert de chaleur à contre-courant.
  8. Circuit de réfrigération selon la revendication 6, dans lequel ledit troisième conduit comprend un tube capillaire formant au moins une partie dudit second agencement de transfert de chaleur.
EP19910310187 1990-11-09 1991-11-05 Système de réfrigération Expired - Lifetime EP0485147B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61205190A 1990-11-09 1990-11-09
US612051 2000-07-07

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EP0485147A1 EP0485147A1 (fr) 1992-05-13
EP0485147B1 true EP0485147B1 (fr) 1996-06-19

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0624763A1 (fr) * 1993-05-10 1994-11-17 General Electric Company Evaporateur à décharche libre d'un système frigorifique
US7377126B2 (en) * 2004-07-14 2008-05-27 Carrier Corporation Refrigeration system
US7824725B2 (en) 2007-03-30 2010-11-02 The Coca-Cola Company Methods for extending the shelf life of partially solidified flowable compositions
WO2014048485A1 (fr) * 2012-09-28 2014-04-03 Electrolux Home Products Corporation N. V. Réfrigérateur
CN103512257B (zh) * 2013-09-27 2016-01-20 西安交通大学 用于双温电冰箱的非共沸碳氢混合物自复叠制冷循环系统
CN104776595A (zh) * 2015-04-28 2015-07-15 唐玉敏 一种太阳能异聚态热利用系统
JP2020034248A (ja) * 2018-08-31 2020-03-05 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． 冷蔵庫
WO2020045868A1 (fr) 2018-08-31 2020-03-05 Samsung Electronics Co., Ltd. Réfrigérateur

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Publication number Priority date Publication date Assignee Title
US2081883A (en) * 1934-11-26 1937-05-25 Kelvinator Corp Refrigerating apparatus
GB639691A (en) * 1947-01-04 1950-07-05 British Thomson Houston Co Ltd Improvements in and relating to refrigerating systems
JPS5270473A (en) * 1975-12-10 1977-06-11 Hitachi Ltd Refrigerator
US4291548A (en) * 1980-07-07 1981-09-29 General Motors Corporation Liquid accumulator
US4918942A (en) * 1989-10-11 1990-04-24 General Electric Company Refrigeration system with dual evaporators and suction line heating

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JP3321192B2 (ja) 2002-09-03
DE69120376D1 (de) 1996-07-25
DE69120376T2 (de) 1997-02-06
EP0485147A1 (fr) 1992-05-13
JPH04288454A (ja) 1992-10-13

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