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1. WO2007086871 - REFRIGERANT SYSTEM UNLOADING BY-PASS INTO EVAPORATOR INLET

Publication Number WO/2007/086871
Publication Date 02.08.2007
International Application No. PCT/US2006/003211
International Filing Date 27.01.2006
IPC
F25B 41/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
41Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler
F25B 49/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
49Arrangement or mounting of control or safety devices
F25B 1/10 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
1Compression machines, plant or systems with non-reversible cycle
10with multi-stage compression
CPC
F25B 1/04
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
1Compression machines, plant, or systems with non-reversible cycle
04with compressor of rotary type
F25B 1/10
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
1Compression machines, plant, or systems with non-reversible cycle
10with multi-stage compression
F25B 2400/0403
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2400General 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
04Refrigeration circuit bypassing means
0403for the condenser
F25B 2400/0411
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2400General 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
04Refrigeration circuit bypassing means
0411for the expansion valve or capillary tube
F25B 2600/0261
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2600Control issues
02Compressor control
026by controlling unloaders
0261external to the compressor
F25B 2600/0262
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
2600Control issues
02Compressor control
026by controlling unloaders
0262internal to the compressor
Applicants
  • CARRIER CORPORATION [US]/[US] (AllExceptUS)
  • LIFSON, Alexander [US]/[US] (UsOnly)
Inventors
  • LIFSON, Alexander
Agents
  • OLDS, Theodore, W.
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) REFRIGERANT SYSTEM UNLOADING BY-PASS INTO EVAPORATOR INLET
(FR) DERIVATION DE DECHARGEMENT D'UN SYSTEME FRIGORIFIQUE DANS L'ENTREE DE L'EVAPORATEUR
Abstract
(EN)
A refrigerant system has at least one unloader valve selectively communicating refrigerant between the compressor compression chambers and a point upstream of the evaporator. When the compressor is run in unloaded mode, partially compressed refrigerant is returned to a point upstream of the evaporator. In an unloaded mode, a higher refrigerant mass flow rate passes through the evaporator, as compared to prior art where the by-passed refrigerant was returned downstream of the evaporator. This increases system efficiency by more effectively returning oil which otherwise might be left in the evaporator back to the compressor. Also, the amount of refrigerant superheat entering the compressor in unloaded operation is reduced as compared to the prior art compressor systems, wherein the by-passed refrigerant is returned directly to the compressor suction line. Reduced refrigerant superheat increases system efficiency, improves motor performance and reduces compressor discharge temperature. Also, by moving the unloader line further away from the compressor, the compressor replacement is simplified as there is no connecting unloader line directly in front of the compressor.
(FR)
L'invention concerne un système frigorifique muni d'au moins une vanne de décharge faisant communiquer sélectivement de l'agent frigorigène entre les chambres de compression du compresseur et un point situé en amont de l'évaporateur. Lorsque le compresseur fonctionne en mode déchargé, de l'agent frigorigène partiellement comprimé est renvoyé à un point situé en amont de l'évaporateur. En mode déchargé, un débit massique plus important d'agent frigorigène traverse l'évaporateur, par comparaison à l'état de la technique antérieure où l'agent frigorigène dérivé était renvoyé en aval de l'évaporateur. Ceci augmente le rendement du système en renvoyant plus efficacement au compresseur l'huile qui serait autrement laissée dans l'évaporateur. En outre, le degré de surchauffe de l'agent frigorigène entrant dans le compresseur en fonctionnement déchargé est réduit par comparaison aux systèmes de compresseur selon la technique antérieure, où l'agent frigorigène dérivé est renvoyé directement à la conduite d'aspiration du compresseur. Une surchauffe réduite de l'agent frigorigène augmente le rendement du système, améliore les performances du moteur et réduit la température de refoulement du compresseur. En outre, en éloignant davantage la conduite de décharge du compresseur, le remplacement du compresseur est simplifié car il n'existe aucune conduite de décharge se raccordant juste devant le compresseur.
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