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
  • 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
  • F25B41/00—Fluid-circulation arrangements
  • F25B41/30—Expansion means; Dispositions thereof
  • F25B41/37—Capillary tubes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B41/00—Fluid-circulation arrangements
  • F25B41/30—Expansion means; Dispositions thereof
  • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
• • 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
  • F25B2400/16—Receivers

Definitions

• This invention relates to refrigeration circuits as described in the first part of Claim 1.
• a circuit like this is known from U.S. Pat. No.2520045, wherein the flow of refrigerant, between receiver and evaporator, is regulated by the difference between the pressure the evaporator and the pressure in the receiver, which correspond to the temperature at the exit of the evaporator. I this way the difference in pressure between the evaporator and the receiver correspond to the superheat of the evaporator.
• This interaction makes a self- balancing effect, because increasing superheat causes increasing flow, which causes decreasing superheat - and contrary. That means that the flow of refrigerant to the evaporator is controlled by the superheat of the evaporator, just like an ordinary, thermal expansion valve.
• the invention distinct from the above mentioned by the evaporator is completely inundated and the suction gas is supersaturated, which means that the suction gas leaving the evaporator contains refrigerant in liquid state.
• the temperature in the receiver is controlled by heat exchange between the liquid from the condenser and the supersaturated suction gas. This causes a self-balancing effect because when the fluid content of the suction gas decreases then the temperature of the receiver increases, whereby the flow to the evaporator increases, and the fluid content of the suction gas increases - and contrary. In this way, the flow of refrigerant to the evaporator is controlled by the fluid content of the suction gas.
• boiling in the capillary tube can be avoided by subcooling the refrigerant before entering the capillary tube.
• the subcooling is realized by placing the valve at the entry of the evaporator or in a tube placed in continuation of the entry.
• the present invention provides a refrigeration system where the evaporator is inundated, the suction gas is superheated before it come to compressor and the liquid from the condenser is sub-cooled. All three factors contribute to increase the Coefficient Of Performance (COP). Calculations confirmed by test show that the COP is increased by more than ten percent.
• COP Coefficient Of Performance
• Fig. 1 is a diagrarrimatic view of the SelfCoolingValve. It is composed by an inner tube (1) connected by a capillary tube (2) to en outer shell (3). The flow is from (4) to (5).
• the outer shell (3) is either the entry of the evaporator or it can be a tube placed in continuation of the entry (5).
• Fig. 2 is a side view of the heat exchanger. It is build from three concentric tubes (6), (7) and (8).
• the inner tube (8) is for the suction gas, which flows from (9) to (10).
• the middle tube (7) makes a shell around the inner tube. It has a connecting-piece at top
• the outer tube (6) makes a shell around the middle tube. It contains frost-proof water, and is made hatch on the drawing.
• Fig. 3 is a top view of the heat exchanger. The numbers have the same meaning as in fig. 2.
• Fig. 4 shows a diagrammatic view of a refrigerating system embodying a compressor
• the regulator is composed by a HeatSensitivValve (17), a heat exchanger (18), a receiver (19) and a PressureSensitivValve (20).
• the heat exchanger (18) is shown in more details in fig. 2 and 3.
• the regulator is composed of four parts:
• HeatSensitivValve This valve must comply with two demands: • Increasing pressure across the valve - increasing flow of refrigerant
• a capillary tube complies with these demands.
• the diameter and length of the capillary tube can be calculated or found by experiment.
• the purpose of the heat exchanger is to transfer heat from the liquid from the condenser to the suction gas.
• the heat exchanger must have a large heat capacity, to suppress resonance between the evaporator and the receiver.
• the heat capacity of the heat exchanger must be so large, that the pressure in the receiver reacts slower, than the fluid content of the suction gas, in respond to a change in the flow of refrigerant.
• An appropriated heat capacity can be obtain by incorporating a reservoir with frostproof water.
• Fig. 2 & 3 show an instance composed by three concentric copper tubes. •
• the outer tube (6) makes a container with a suitable quantity of frost-proof water.
• Receiver The receiver (19) must be large enough to contain all of refrigerant in the system.
• That can be a capillary tube if the flow is subcooled down to the end temperature, before entering the capillary tube.
• the SelfCoolingNalve shown in fig. 1 has this property. Warm refrigerant enters at (4). ' In the tube (1), the flow is cooled to the same temperature as outside the tube. The
• refrigerant flows through the capillary tube (2) without boiling. From the capillary tube, the refrigerant discharges at the bottom of the outer tube (3). The refrigerant flows over the outside of the inner tube and hereby the tube is cooled. The refrigerant is boiling while absorbing heat. Fluid and vapour are flowing into the evaporator at (5).

Landscapes

• 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)
• Details Of Measuring And Other Instruments (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)
• Air Conditioning Control Device (AREA)
• Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• External Artificial Organs (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

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Family Applications (1)

Country Status (8)

Families Citing this family (10)

Family Cites Families (8)

• 2000
  • 2000-03-13 DK DK200000398A patent/DK174179B1/da active
• 2001
  • 2001-03-05 DE DE60113072T patent/DE60113072T2/de not_active Expired - Lifetime
  • 2001-03-05 EP EP01911456A patent/EP1264150B1/fr not_active Expired - Lifetime
  • 2001-03-05 WO PCT/DK2001/000142 patent/WO2001073360A1/fr not_active Ceased
  • 2001-03-05 US US10/204,663 patent/US20030097856A1/en not_active Abandoned
  • 2001-03-05 AU AU2001240471A patent/AU2001240471A1/en not_active Abandoned
  • 2001-03-05 AT AT01911456T patent/ATE303566T1/de not_active IP Right Cessation
• 2002
  • 2002-09-11 NO NO20024334A patent/NO325992B1/no not_active IP Right Cessation

Non-Patent Citations (1)

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