WO2006132626A1 - Capacity control for refrigerant system with multiple compressors - Google Patents
Capacity control for refrigerant system with multiple compressors Download PDFInfo
- Publication number
- WO2006132626A1 WO2006132626A1 PCT/US2005/019752 US2005019752W WO2006132626A1 WO 2006132626 A1 WO2006132626 A1 WO 2006132626A1 US 2005019752 W US2005019752 W US 2005019752W WO 2006132626 A1 WO2006132626 A1 WO 2006132626A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacity
- compressors
- control
- refrigerant system
- percentage
- Prior art date
Links
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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/15—Power, e.g. by voltage or current
- F25B2700/151—Power, e.g. by voltage or current of the compressor motor
Definitions
- This application relates to a method and a control for controlling a refrigerant system having multiple compressors to operate in a most efficient manner.
- Refrigerant systems are known, and are typically utilized to condition the air in an environment, such as an air conditioner or heat pump.
- a refrigerant system typically is operated at a capacity, which is selected to most efficiently control the temperature in the environment to be conditioned.
- a capacity which is selected to most efficiently control the temperature in the environment to be conditioned.
- a higher capacity would be desirably provided by the refrigerant system.
- a lower capacity may be selected.
- tandem compressors One type of refrigerant system operates with tandem compressors. While the term tandem is utilized, and two compressors will be discussed, systems having three or even more compressors are also known and would benefit from this invention.
- the tandem compressors are controlled to together provide a desired amount of compressed refrigerant within the refrigerant system. Compressors can have their capacities varied, and the tandem compressors are no exception.
- a slide valve is positioned adjacent compression chambers, and may be opened to control how much refrigerant is compressed by the screw compressor.
- a control for the refrigerant system can move the slide valve to achieve a desired amount of capacity as is required to condition the environment to be cooled (or heated).
- a control makes an estimate of which of the tandem compressors is operating at a highest percentage of its capacity.
- the compressor operating at the highest percentage of its capacity will be lowered in capacity should there be excess capacity.
- the compressor utilizing the lowest percentage of its maximum capacity will have its capacity increased. In this manner, the tandem compressors will operate close to the same percentage of their maximum capacity. It has been found that this state of operation will maximize the overall efficiency of the system.
- the current leading to a motor is monitored, and compared to a maximum current for the compressor motor.
- motors are provided with a rated load amps (RLA).
- RLA rated load amps
- a percentage of capacity can be approximated.
- the ratios between the tandem compressors can be compared to identify which compressor is operating at the highest percentage of its capacity.
- the control then changes capacity in view of which motor is operating at the highest percentage.
- Figure 1 is a schematic of a refrigerant system incorporating the present invention.
- FIG. 2 is a flowchart of the present invention.
- a refrigerant system 20 is illustrated in Figure 1 having tandem compressors 22 and 24, which each compress and deliver a refrigerant into a discharge line 25 leading to a common discharge 26.
- Discharge line 26 passes through an outdoor heat exchanger 28 (if the refrigerant system 20 is an air conditioner) and then through an expansion device 30. Downstream of the expansion device 30 is an indoor heat exchanger 32 (again in air conditioning mode). If the refrigerant system 20 were operated in a heating mode, the refrigerant would first pass through the indoor heat exchanger 32 directly downstream of the compressors 22, 24. The present invention would extend to either type mode. As shown, an environment to be cooled 34 receives air driven over the evaporator 32.
- the environment 34 is provided with a control 41, such as a thermostat, and including a temperature sensor.
- the control 41 communicates with, or incorporates, a system control.
- the control 41 will provide an indication of the cooling load (or heating load) on the system.
- an occupant of the environment 34 sets a desired temperature at the control 41, and the control 41 operates the refrigerant system 20 to achieve that desired temperature.
- humidity control, etc. can also be provided.
- refrigerant Downstream of the evaporator 32, refrigerant passes into a common suction line 35, and then into separate suction lines 36 leading to the tandem compressors 22, 24.
- Slide valves 38 are positioned on the compressors 22, and each communicate with the control 41.
- the control 41 is operable to drive the slide valves 38 more open or less open dependent upon a perceived need to increase or decrease the capacity provided by the refrigerant system 20.
- a power supply 39 supplies power to an electric motor for each of the compressors 22 and 24. As shown, a sensor is placed on the power supply 39, and communicates with the control 41.
- control 41 identifies a cooling (or heating) load to achieve a desired temperature within the environment 34.
- the control 41 then operates the system, including stopping/starting compressors 22, 24 and opening/closing the slide valves 38.
- This aspect of the invention is as known.
- the present invention is directed to an algorithm explained in the flowchart of
- the present invention is directed to moving each of the tandem compressors (of course the invention can extend to more than two compressors) to be close to each other in a percentage of total capacity at which they operate.
- the present invention monitors the current being supplied by the current supplies 39 to the motors for the compressors 22 and 24. As shown in the flowchart, a ratio of this actual current to the RLA for each motor is determined.
- the control 41 then asks if the capacity is sufficient to meet the load presented by the environment 34. If the capacity is proper, then the algorithm returns to the first step. However, if additional capacity is needed, the compressor having the motor with the lower ratio has its load increased. In the disclosed embodiment, this would mean closing its slide valve somewhat.
- compressor with the highest ratio has its capacity reduced. Again, this would mean opening its slide valve.
- a compressor with a slide valve is disclosed, other ways of changing the capacity can be utilized with the present invention.
- refrigerant systems are known having electric motors that can be variable in speed. This type compressor motor can be utilized in the inventive method.
- one way is disclosed to determine the percentage of capacity, other ways would come within the scope of this invention.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002606308A CA2606308A1 (en) | 2005-06-03 | 2005-06-03 | Capacity control for refrigerant system with multiple compressors |
EP05757068A EP1886074A4 (en) | 2005-06-03 | 2005-06-03 | Capacity control for refrigerant system with multiple compressors |
US11/908,977 US20080190126A1 (en) | 2005-06-03 | 2005-06-03 | Capacity Control For Refrigerant System With Multiple Compressors |
PCT/US2005/019752 WO2006132626A1 (en) | 2005-06-03 | 2005-06-03 | Capacity control for refrigerant system with multiple compressors |
CN2005800499926A CN101194130B (en) | 2005-06-03 | 2005-06-03 | Refrigeration system and operation method thereof |
HK08112901.5A HK1121523A1 (en) | 2005-06-03 | 2008-11-25 | A refrigerant system and a method of operating a refrigerant system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2005/019752 WO2006132626A1 (en) | 2005-06-03 | 2005-06-03 | Capacity control for refrigerant system with multiple compressors |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006132626A1 true WO2006132626A1 (en) | 2006-12-14 |
Family
ID=37498743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/019752 WO2006132626A1 (en) | 2005-06-03 | 2005-06-03 | Capacity control for refrigerant system with multiple compressors |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080190126A1 (en) |
EP (1) | EP1886074A4 (en) |
CN (1) | CN101194130B (en) |
CA (1) | CA2606308A1 (en) |
HK (1) | HK1121523A1 (en) |
WO (1) | WO2006132626A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3417218A4 (en) * | 2016-02-19 | 2019-10-23 | Emerson Climate Technologies, Inc. | Compressor capacity modulation system for multiple compressors |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013103677B4 (en) | 2013-04-11 | 2024-01-25 | Maxhütte Technologie GmbH & Co. KG | Method for controlling a heat pump network |
US9951984B2 (en) | 2013-05-21 | 2018-04-24 | Carrier Corporation | Tandem compressor refrigeration system and a method of using the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5265434A (en) * | 1979-07-31 | 1993-11-30 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US5327742A (en) * | 1993-05-07 | 1994-07-12 | Carrier Corporation | Hierarchial control for discrete chiller units |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3759052A (en) * | 1972-02-28 | 1973-09-18 | Maekawa Seisakusho Kk | Method of controlling high stage and low stage compressors |
US5264434A (en) * | 1988-08-05 | 1993-11-23 | Basf Aktiengesellschaft | Phenoxyalkyl-substituted heteroaromatics and their use for controlling pests |
US5797729A (en) * | 1996-02-16 | 1998-08-25 | Aspen Systems, Inc. | Controlling multiple variable speed compressors |
US6370888B1 (en) * | 2000-08-31 | 2002-04-16 | Carrier Corporation | Method for controlling variable speed drive with chiller equipped with multiple compressors |
KR100437054B1 (en) * | 2002-05-27 | 2004-06-23 | 엘지전자 주식회사 | Over load protecting device for heat pump and method for the same |
KR20040050477A (en) * | 2002-12-10 | 2004-06-16 | 엘지전자 주식회사 | An air-condition system |
CN1761848A (en) * | 2003-01-24 | 2006-04-19 | 布里斯托尔压缩机公司 | System and method for stepped capacity modulation in a refrigeration system |
US7207183B2 (en) * | 2004-04-12 | 2007-04-24 | York International Corp. | System and method for capacity control in a multiple compressor chiller system |
-
2005
- 2005-06-03 CN CN2005800499926A patent/CN101194130B/en not_active Expired - Fee Related
- 2005-06-03 WO PCT/US2005/019752 patent/WO2006132626A1/en active Application Filing
- 2005-06-03 CA CA002606308A patent/CA2606308A1/en not_active Abandoned
- 2005-06-03 US US11/908,977 patent/US20080190126A1/en not_active Abandoned
- 2005-06-03 EP EP05757068A patent/EP1886074A4/en not_active Withdrawn
-
2008
- 2008-11-25 HK HK08112901.5A patent/HK1121523A1/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5265434A (en) * | 1979-07-31 | 1993-11-30 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US5327742A (en) * | 1993-05-07 | 1994-07-12 | Carrier Corporation | Hierarchial control for discrete chiller units |
Non-Patent Citations (1)
Title |
---|
See also references of EP1886074A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3417218A4 (en) * | 2016-02-19 | 2019-10-23 | Emerson Climate Technologies, Inc. | Compressor capacity modulation system for multiple compressors |
Also Published As
Publication number | Publication date |
---|---|
US20080190126A1 (en) | 2008-08-14 |
HK1121523A1 (en) | 2009-04-24 |
EP1886074A1 (en) | 2008-02-13 |
CA2606308A1 (en) | 2006-12-14 |
CN101194130B (en) | 2010-06-16 |
EP1886074A4 (en) | 2012-03-07 |
CN101194130A (en) | 2008-06-04 |
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