ClassID:

159191

F25B43/02 - CPC Classification

Classification description:

Arrangements for separating or purifying gases or liquids ; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant

Recent Application in this class:
#1
20260118024
2026-04-30

COMPRESSOR ASSEMBLY, AIR CONDITIONER OUTDOOR UNIT AND AIR CONDITIONING SYSTEM

#2
20260029180
2026-01-29

REFRIGERATION SYSTEM

#3
20260021432
2026-01-22

Centrifugal Oil Separator, System, and Methods of Use

#4
20260009571
2026-01-08

METHOD FOR CONTROLLING THE FILL LEVEL OF AN OIL SEPARATOR FOR A COOLING CIRCUIT AND ASSOCIATED SYSTEM

#5
20250297183
2025-09-25

WORKING FLUID, FREEZER, AND FREEZER OIL

#6
20250277611
2025-09-04

REFRIGERANT CIRCULATION SYSTEM

#7
20250264254
2025-08-21

SYSTEM AND METHOD FOR LUBRICANT MANAGEMENT IN A HEATING, VENTILATION, AIR CONDITIONING, AND REFRIGERATION (HVACR) SYSTEM

#8
20250257915
2025-08-14

METHOD AND APPARATUS FOR STAGED STARTUP OF AIR-COOLED LOW CHARGED PACKAGED AMMONIA REFRIGERATION SYSTEM

#9
20250198671
2025-06-19

COMPRESSOR AND HOME APPLIANCE INCLUDING THE SAME

#10
20250196570
2025-06-19

HEAT MANAGEMENT SYSTEM FOR VEHICLE

#11
20250155172
2025-05-15

COMPRESSOR OIL RECOVERY IN HYBRID VCC PUMPED TWO PHASE LOOPS

#12
20250155170
2025-05-15

Refrigeration System with Efficient Expansion Device Control, Liquid Refrigerant Return, Oil Return, and Evaporator Defrost

#13
20250116442
2025-04-10

CONDENSER VESSEL, SYSTEM, AND METHOD FOR SEPARATING OIL FROM AN OIL-REFRIGERANT MIXTURE

#14
20250109897
2025-04-03

COMPRESSION SYSTEM AND CLOTHING TREATMENT DEVICE INCLUDING SAME

#15
20250075953
2025-03-06

REFRIGERANT ACCUMULATOR

#16
20250067485
2025-02-27

OIL SEPARATOR

#17
20250060139
2025-02-20

A WORKING FLUID EXTRACTION SYSTEM FOR A DISPLACEMENT MACHINE AND A METHOD OF OPERATING THE SYSTEM

#18
20250020374
2025-01-16

REFRIGERATION APPARATUS

#19
20240418421
2024-12-19

Separator device, compressor with a separator device, and refrigeration system with a separator device

#20
20240377115
2024-11-14

AIR CONDITIONING SYSTEM, AIR CONDITIONER OUTDOOR UNIT AND COMPRESSOR ASSEMBLY

#21
20240335843
2024-10-10

GAS-LIQUID SEPARATOR

#22
20240271842
2024-08-15

OIL SEPARATION DEVICE FOR CONDENSER, CONDENSER HAVING IT AND REFRIGERATION SYSTEM

#23
20240255200
2024-08-01

ACCUMULATOR AND REFRIGERATION CYCLE APPARATUS

#24
20240210080
2024-06-27

Thermal System

#25
20240183595
2024-06-06

Cooling system with oil return to accumulator

#26
20240175610
2024-05-30

Refrigeration system with efficient expansion device control, liquid refrigerant return, oil return, and evaporator defrost

#27
20240102710
2024-03-28

Refrigerant bypass solution

#28
20240085073
2024-03-14

Cooling device

#29
20240068718
2024-02-29

Cooling system with oil return to accumulator

#30
20240053070
2024-02-15

Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system

#31
20240035722
2024-02-01

OIL SEPARATOR FOR COMPRESSOR AND COMPRESSOR FOR CRYOGENIC REFRIGERATOR

#32
20240018961
2024-01-18

Compressor containing oil separator with multiple internal muffler spaces

#33
20240018437
2024-01-18

WORKING FLUID, FREEZER, AND FREEZER OIL

#34
20240011672
2024-01-11

Refrigeration System with Oil Control System

#35
20240003603
2024-01-04

Suction gas heat exchanger control and utilization

#36
20230384008
2023-11-30

REFRIGERATION SYSTEM

#37
20230349603
2023-11-02

Method For Controlling Refrigerant Liquid Flood-Back Within A Chiller And A System Thereof

#38
20230272951
2023-08-31

Compression apparatus

#39
20230235929
2023-07-27

Cooling system with oil return to accumulator

#40
20230228471
2023-07-20

MULTI-LEVEL OIL VAPORIZER FOR REFRIGERATION SYSTEM

#41
20230202262
2023-06-29

Gas-liquid separation device for vehicle heat pump system having the same

#42
20230175746
2023-06-08

Control of refrigerant injection into a compressor in an economized refrigeration cycle

#43
20230135687
2023-05-04

Heat pump

#44
20230113193
2023-04-13

Compressor module and electric-motor-driven refrigerant compressor

#45
20230112193
2023-04-13

Refrigeration system with efficient expansion device control, liquid refrigerant return, oil return, and evaporator defrost

#46
20230080586
2023-03-16

OIL SEPARATOR AND OUTDOOR UNIT FOR AIR CONDITIONER

#47
20230019047
2023-01-19

Refrigeration cycle device

#48
20220404077
2022-12-22

Refrigeration system and oil recovery method for the same

#49
20220390157
2022-12-08

Oil supply system for compressor

#50
20220357086
2022-11-10

REFRIGERATION CYCLE DEVICE

#51
20220349634
2022-11-03

Oil Separation Device, Condenser, and Refrigeration System Using Oil Separation Device or Condenser

#52
20220260290
2022-08-18

Refrigeration device and oil cooling device

#53
20220243963
2022-08-04

Cooling system with oil return to accumulator

#54
20220221210
2022-07-14

Refrigeration apparatus

#55
20220205695
2022-06-30

Defrosting control method of multifunctional multi-split system with double four-way valves

#56
20220200407
2022-06-23

Two-phase thermal management system with active control for high density electric machine

#57
20220178601
2022-06-09

REFRIGERATION CYCLE DEVICE

#58
20220170465
2022-06-02

Refrigerant bypass solution

#59
20220146159
2022-05-12

Refrigeration apparatus with stainless steel four-way switching valve and stainless steel pipes connected thereto

#60
20220128280
2022-04-28

COMPRESSOR, AND REFRIGERATION DEVICE

#61
20220113072
2022-04-14

REFRIGERATION CYCLE APPARATUS

#62
20220113071
2022-04-14

Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system

#63
20220107126
2022-04-07

Multi-air conditioner for heating and cooling operations

#64
20220065502
2022-03-03

Heat exchange system and method for reclaiming corrosion inhibitor in heat exchange system

#65
20220026125
2022-01-27

PHOBIC/PHILIC STRUCTURES IN REFRIGERATION SYSTEMS AND LIQUID VAPOR SEPARATION IN REFRIGERATION SYSTEMS

#66
20220026124
2022-01-27

Water-cooled heat exchanger

#67
20220003468
2022-01-06

Automatic oil level retention system for compressor and method for controlling same

#68
20210404456
2021-12-30

3D-printed oil separation for reciprocating compressors

#69
20210396436
2021-12-23

LUBRICANT MANAGEMENT FOR AN HVACR SYSTEM

#70
20210372676
2021-12-02

Cooling system with supplemental oil extraction from refrigerant

#71
20210372675
2021-12-02

Oil separator with integrated muffler

#72
20210341191
2021-11-04

Modular arrangement for use in a vapor-compression refrigeration system

#73
20210333025
2021-10-28

Control Of Refrigerant Injection Into A Compressor In An Economized Refrigeration Cycle

#74
20210318042
2021-10-14

Vapor compression system and method for vapor oil recovery

#75
20210302085
2021-09-30

Refrigerated container refrigeration system capable of preventing freezing of container door

#76
20210302081
2021-09-30

Integrated oil separator with flow management

#77
20210302080
2021-09-30

Integrated oil separator with a condenser

#78
20210285693
2021-09-16

Lubricant management for an HVACR system

#79
20210270505
2021-09-02

Cooling system with oil return to accumulator

#80
20210270503
2021-09-02

Cooling system with oil return to accumulator

#81
20210254870
2021-08-19

Refrigerant vessel component and refrigeration circuit comprising such a refrigerant vessel component

#82
20210247115
2021-08-12

Enhanced method of lubrication for refrigeration compressors

#83
20210231353
2021-07-29

Water-cooled heat exchanger

#84
20210215412
2021-07-15

Vertical oil separator

#85
20210180851
2021-06-17

Cooling system with partly flooded low side heat exchanger

#86
20210172661
2021-06-10

Separator and refrigeration cycle apparatus

#87
20210116158
2021-04-22

Recycle information management system

#88
20210055045
2021-02-25

Micro Booster Supermarket Refrigeration Architecture

#89
20210018235
2021-01-21

System and method for lubricant separation and return control

#90
20210010725
2021-01-14

Refrigeration cycle apparatus

#91
20200386455
2020-12-10

REFRIGERATION MACHINE

#92
20200378668
2020-12-03

Lubricant quality management for a compressor

#93
20200378664
2020-12-03

LUBRICANT MANAGEMENT IN AN HVACR SYSTEM

#94
20200378663
2020-12-03

Gas-liquid separation device for vehicle

#95
20200378658
2020-12-03

Refrigeration apparatus

#96
20200333053
2020-10-22

COOLING CIRCUIT SECTION AND COOLING CIRCUIT

#97
20200309428
2020-10-01

Bidirectional filter drier

#98
20200292220
2020-09-17

Oil separator and refrigeration cycle apparatus

#99
20200292216
2020-09-17

Refrigerating cycle apparatus

#100
20200284486
2020-09-10

Oil separator, filter element, and compressor for cryocooler

#101
20200256603
2020-08-13

Suction conduit flow control for lubricant management

#102
20200256600
2020-08-13

Compressor

#103
20200248942
2020-08-06

SEPERATOR AND METHOD FOR SEPARATING LUBRICANT FROM LUBRICANT-CHARGED GASEOUS REFRIGERANT

#104
20200248941
2020-08-06

Oil separator and air conditioner including the same

#105
20200238207
2020-07-30

Oil separator

#106
20200230535
2020-07-23

Oil separator

#107
20200224945
2020-07-16

Oil separator, compressor and air conditioner

#108
20200224944
2020-07-16

Cooling system with supplemental oil extraction from refrigerant

#109
20200208638
2020-07-02

Lubricant injection for a screw compressor

#110
20200191455
2020-06-18

Integral service refrigerant pump

#111
20200191454
2020-06-18

Systems and methods for controlling compressor motors

#112
20200191453
2020-06-18

Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system

#113
20200166258
2020-05-28

Oil return control method and device of air conditioning system, storage medium and air conditioning system

#114
20200166254
2020-05-28

Linear compressor

#115
20200149793
2020-05-14

Compressor with fluid cavity for cooling

#116
20200132351
2020-04-30

Cooling system

#117
20200124346
2020-04-23

Method of cooling boil-off gas and apparatus therefor

#118
20200102943
2020-04-02

3D-Printed Oil Separation for Reciprocating Compressors

#119
20200064035
2020-02-27

Phobic/philic structures in refrigeration systems and liquid vapor separation in refrigeration systems

#120
20200064029
2020-02-27

Device for storing refrigerant of a refrigerant circuit system and method for operating the device

#121
20200063987
2020-02-27

Heat pump

#122
20200056818
2020-02-20

Oil separation device and refrigeration cycle apparatus

#123
20200047098
2020-02-13

Cyclone for separation of gas-liquid mixture, and a refrigerant accumulator containing this cyclone

#124
20200041170
2020-02-06

Two-stage compressor

#125
20200016522
2020-01-16

Centrifugal Mesh Mist Eliminator

#126
20190383539
2019-12-19

Lubricant quality management for a compressor

#127
20190376730
2019-12-12

REFRIGERATION APPARATUS

#128
20190360734
2019-11-28

Electric compressor

#129
20190360727
2019-11-28

Refrigeration system with oil control system

#130
20190360725
2019-11-28

REFRIGERATION APPARATUS

#131
20190346190
2019-11-14

Compressor and refrigeration cycle apparatus

#132
20190293329
2019-09-26

Liquid level detection device and refrigeration cycle apparatus

#133
20190293325
2019-09-26

Methods and systems of streaming refrigerant in a heat exchanger

#134
20190277547
2019-09-12

Muffler for lubricant separator

#135
20190264962
2019-08-29

A METHOD FOR CONTROLLING PRESSURE AND OIL LEVEL IN AN OIL RECEIVER OF A VAPOUR COMPRESSIONS SYSTEM

#136
20190242622
2019-08-08

Refrigeration cycle apparatus

#137
20190234665
2019-08-01

ICE MAKING MACHINE SET AND REFRIGERATION SYSTEM

#138
20190178543
2019-06-13

Accumulator and oil separator

#139
20190162457
2019-05-30

Lubrication and cooling system

#140
20190154317
2019-05-23

Cooling system

#141
20190154279
2019-05-23

Heat source unit

#142
20190145678
2019-05-16

Crankcase oil separation for high pressure reciprocating compressors

#143
20190128580
2019-05-02

Turbo freezing machine and start-up control method therefor

#144
20190128579
2019-05-02

Compression device and control mass flow separation method

#145
20190120231
2019-04-25

Separator device for separating a fluid, in particular a lubricant, from a coolant

#146
20190101312
2019-04-04

Compact individual multistage universal hybrid oil separator

#147
20190093930
2019-03-28

Refrigerant recovery and recycling system with serviceable debris filter

#148
20190086131
2019-03-21

Accumulator, and refrigeration cycle

#149
20190086125
2019-03-21

Modular cooling system for high-rise building

#150
20190078811
2019-03-14

REFRIGERATOR

#151
20190049154
2019-02-14

Air-conditioning apparatus

#152
20190032968
2019-01-31

Outdoor unit of an air conditioning system, air conditioning system, and control method thereof

#153
20190024994
2019-01-24

OIL SEPARATOR

#154
20180347877
2018-12-06

Compressor cooling system

#155
20180328626
2018-11-15

Refrigeration cycle apparatus

#156
20180306472
2018-10-25

Multi-stage oil batch boiling system

#157
20180283746
2018-10-04

Refrigeration cycle apparatus in which a lubricating oil circulates together with refrigerant

#158
20180266732
2018-09-20

Modular cooling system for high-rise building

#159
20180259274
2018-09-13

Oil separator

#160
20180209696
2018-07-26

Two-stage compression refrigeration cycle

#161
20180202425
2018-07-19

Oil separate and collect device

#162
20180195781
2018-07-12

Oil management for micro booster supermarket refrigeration system

#163
20180195773
2018-07-12

Micro booster supermarket refrigeration architecture

#164
20180135904
2018-05-17

Condenser

#165
20180128521
2018-05-10

Cooling system

#166
20180120008
2018-05-03

Apparatus and method for determining the quantity of dissolved refrigerant in oil recovered from an air conditioning system

#167
20180080694
2018-03-22

Heat pump

#168
20180073788
2018-03-15

Device for separating oil from a refrigerant fluid

#169
20180051704
2018-02-22

Heat pump

#170
20180038618
2018-02-08

LUBRICANT SEPARATOR

#171
20180023871
2018-01-25

Temperature control method

#172
20180023870
2018-01-25

Air conditioning device

#173
20180023868
2018-01-25

Refrigeration cycle apparatus with oil separator switching valve

#174
20180023847
2018-01-25

Ejector refrigeration cycle

#175
20170350624
2017-12-07

Refrigeration cycle device

#176
20170343257
2017-11-30

Gas recovery system for compressor, compressor system, and refrigeration cycle system

#177
20170336116
2017-11-23

Air-conditioning apparatus

#178
20170336112
2017-11-23

Apparatus and method for indicating status of multi-phase vacuum-assisted recovery of refrigerant

#179
20170336111
2017-11-23

Apparatus and method for a multi-phase vacuum-assisted recovery of refrigerant

#180
20170328581
2017-11-16

Heat pump

#181
20170321937
2017-11-09

Linear compressor

#182
20170284706
2017-10-05

Refrigeration cycle device

#183
20170284696
2017-10-05

Direct expansion air conditioning system with separate outdoor air latent cooling and return air sensible cooling arrangements

#184
20170282112
2017-10-05

Oil separator having nanorod surface layer inside

#185
20170276415
2017-09-28

Oil separator

#186
20170268808
2017-09-21

IMPROVED DIRCET EXPANSION EVAPORATOR BASED CHILLER SYSTEM

#187
20170261227
2017-09-14

Modular rack for climate control system

#188
20170248352
2017-08-31

Chiller compressor oil conditioning

#189
20170234586
2017-08-17

Oil return management in a HVAC system

#190
20170227268
2017-08-10

Lubricant separator for a heating, ventilation, and air conditioning system

#191
20170198696
2017-07-13

Compressor with fluid cavity for cooling

#192
20170184331
2017-06-29

Oil separator

#193
20170176074
2017-06-22

Suction conduit flow control for lubricant management

#194
20170176070
2017-06-22

Helium compressor with dual after-coolers

#195
20170175743
2017-06-22

COLD START HELIUM COMPRESSOR

#196
20170167764
2017-06-15

Oil management in a refrigeration system—compressor oil cooler integrated into gascooler

#197
20170167758
2017-06-15

Cascade refrigeration system

#198
20170131011
2017-05-11

Method and apparatus for optimizing refrigeration systems

#199
20170131008
2017-05-11

FLOODED CENTRAL AIR CONDITIONING SYSTEM

#200
20170089624
2017-03-30

HERMETIC COMPRESSOR AND VAPOR COMPRESSION-TYPE REFRIGERATION CYCLE DEVICE INCLUDING THE HERMETIC COMPRESSOR

#201
20170074569
2017-03-16

Refrigeration apparatus

#202
20170074551
2017-03-16

Refrigeration apparatus

#203
20170051957
2017-02-23

OIL SEPARATION DEVICE

#204
20170038107
2017-02-09

Screw compressor and chiller unit provided with same

#205
20170016656
2017-01-19

SYSTEM AND METHOD FOR REMOVAL OF CONTAMINANTS FROM REFRIGERANTS

#206
20170016654
2017-01-19

Refrigeration cycle device

#207
20170016439
2017-01-19

System for heating a compressor assembly in an HVAC system

#208
20170016438
2017-01-19

Compressor system including a plurality of compressors

#209
20170010027
2017-01-12

Heat recovery variable-frequency multi-split heat pump system and control method thereof

#210
20160370043
2016-12-22

OIL VAPOR COLLECTING DEVICE

#211
20160369145
2016-12-22

Working fluid for heat cycle, composition for heat cycle system, and heat cycle system

#212
20160363356
2016-12-15

Cascade refrigeration system with modular ammonia chiller units

#213
20160356289
2016-12-08

Oil-cooled gas compressor

#214
20160334143
2016-11-17

Switchable two-stage and cascade marine energy-saving ultralow-temperature refrigeration system

#215
20160320098
2016-11-03

CO2 cooling system and method for operating same

#216
20160313038
2016-10-27

External separator

#217
20160305697
2016-10-20

Refrigerant control system for a flash tank

#218
20160298014
2016-10-13

Use of ternary compositions

#219
20160290693
2016-10-06

Compressor with an oil separator between compressing stages

#220
20160265824
2016-09-15

FLUID COLLECTION ASSEMBLY

#221
20160265821
2016-09-15

Air conditioning apparatus

#222
20160238294
2016-08-18

Refrigeration circuit with oil separation

#223
20160238293
2016-08-18

Oil line control system

#224
20160231038
2016-08-11

Rotatory compressor and refrigerating cycle device

#225
20160231035
2016-08-11

Air conditioner with oil separator and injection control thereof

#226
20160209094
2016-07-21

Ejector-type refrigeration cycle, and ejector

#227
20160209088
2016-07-21

Refrigeration cycle apparatus

#228
20160146518
2016-05-26

Methods and systems of streaming refrigerant in a heat exchanger

#229
20160136555
2016-05-19

Oil separator, and compressor provided with same

#230
20160123640
2016-05-05

Air conditioner

#231
20160116196
2016-04-28

Oil separator and air conditioner including an oil separator

#232
20160102899
2016-04-14

Apparatus and method for increasing removal rate of residue

#233
20160069598
2016-03-10

Oil return management in a HVAC system

#234
20160010907
2016-01-14

Refrigeration system with full oil recovery

#235
20160003512
2016-01-07

Air conditioner

#236
20160003511
2016-01-07

Oil management for heating ventilation and air conditioning system

#237
20160003510
2016-01-07

Lubrication and cooling system

#238
20150377531
2015-12-31

LINEAR COMPRESSOR AND REFRIGERATOR INCLUDING A LINEAR COMPRESSOR

#239
20150369528
2015-12-24

Cooling system and refrigerator including a cooling system

#240
20150343365
2015-12-03

Compressor system and oil separation system

#241
20150330687
2015-11-19

OIL SEPARATOR AND AIR CONDITIONER HAVING THE SAME

#242
20150300711
2015-10-22

Compressor

#243
20150285546
2015-10-08

HEAT PUMP APPARATUS AND OPERATION METHOD FOR HEAT PUMP APPARATUS

#244
20150276288
2015-10-01

Oil separator and method for producing oil separator

#245
20150276287
2015-10-01

Phobic/philic structures in refrigeration systems and liquid vapor separation in refrigeration systems

#246
20150275895
2015-10-01

Rotary compressor with increased heating ability and refrigerant circuit for an air conditioner

#247
20150267950
2015-09-24

System and method for recovering refrigerant

#248
20150219372
2015-08-06

Heat-pump system

#249
20150198357
2015-07-16

Binary refrigeration apparatus

#250
20150184910
2015-07-02

Air conditioner

#251
20150184906
2015-07-02

METHODS AND DEVICES TO PREVENT FLUID MIGRATION IN A REFRIGERATION SYSTEM DURING AN OFF CYCLE

#252
20150168044
2015-06-18

Air conditioner and method of controlling an air conditioner

#253
20150167689
2015-06-18

Turbo compressor and turbo refrigerator

#254
20150159668
2015-06-11

Turbo compressor and turbo refrigerator

#255
20150153082
2015-06-04

Heat exchanger for a refrigerant service system

#256
20150153079
2015-06-04

AIR-CONDITIONING APPARATUS AND METHOD FOR CONTROLLING THE SAME

#257
20150121946
2015-05-07

Capacity-Increasing Device For Four-Way Valve In Air Conditioning System And The Air Conditioning System

#258
20150114013
2015-04-30

Air conditioner with oil separators and method for controlling the same

#259
20150101487
2015-04-16

Compressor and oil amount management system for compressor

#260
20150096621
2015-04-09

System for heating a compressor assembly in an HVAC system

#261
20150068229
2015-03-12

Refrigerating cycle apparatus and method for operating the same

#262
20150052936
2015-02-26

Sealed compressor and vapor compression refrigeration cycle apparatus including the sealed compressor

#263
20150052915
2015-02-26

Cooling system and a method for separation of oil

#264
20140345317
2014-11-27

Temperature control apparatus, processing apparatus, and temperature control method

#265
20140331712
2014-11-13

Air-conditioning apparatus

#266
20140331699
2014-11-13

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Refrigeration apparatus

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Sub-surface insulation and well depth reduction for DX geothermal heat pump and refrigeration system

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Compressor cooling system

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Compressor cooling system

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Refrigerant vaporizer

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Oil compensation in a refrigeration circuit

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Refrigerant recovery and recharge device

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Oil separator and air conditioner using the same

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Oil separator and refrigeration cycle apparatus

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Heat exchanger for phase-changing refrigerant, with horizontal distributing and collecting tube

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Method and apparatus for optimizing refrigeration systems

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CHILLER OR HEAT PUMP WITH A FALLING FILM EVAPORATOR AND HORIZONTAL OIL SEPARATOR

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Electronics cooling using lubricant return for a shell-and-tube evaporator

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Chiller system including an oil separator and ejector connection

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Oil-cooled gas compressor

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OIL SEPARATOR AND METHOD OF MANUFACTURING THE SAME

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Cascade refrigeration system with modular ammonia chiller units

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Air conditioner and method for controlling the same

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Reciprocating refrigeration compressor oil separation

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Oil separation means and refrigeration device equipped with the same

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Refrigerating cycle apparatus and method for operating the same

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AIR CONDITIONER

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AIR CONDITIONING LUBRICANT DELIVERY VESSEL, METHOD AND SYSTEM

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Oil separator

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Air conditioner using oil return operation based on outdoor air temperature

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