CN101194130A - Capacity control for refrigeration system with multi-compressor - Google Patents
Capacity control for refrigeration system with multi-compressor Download PDFInfo
- Publication number
- CN101194130A CN101194130A CNA2005800499926A CN200580049992A CN101194130A CN 101194130 A CN101194130 A CN 101194130A CN A2005800499926 A CNA2005800499926 A CN A2005800499926A CN 200580049992 A CN200580049992 A CN 200580049992A CN 101194130 A CN101194130 A CN 101194130A
- Authority
- CN
- China
- Prior art keywords
- capacity
- compressors
- compressor
- controller
- refrigeration system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- 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
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- 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
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- 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
Abstract
A refrigerant system operates with tandem compressors (22, 24). A control (41) for the refrigerant system is operable to change the capacities of each of the compressors dependent upon a load on the system. The control determines the percentage of maximum load capacity currently being utilized by each of the compressors. A compressor with the highest percentage is decreased in capacity should the control determine that excess capacity is being provided. Conversely, the control will increase the capacity of a compressor having a lower percentage, if insufficient capacity is being provided to meet a load on the system.
Description
Technical field
The application relates to and a kind ofly is used to control refrigeration system with multiple compressors so that its method and controller (control) with effective and efficient manner operation.
Background technology
Refrigeration system (such as aircondition or heat pump) is familiar with by people, and it is used usually to regulate the air in the environment.Refrigeration system is generally moved with certain capacity, and this Capacity Selection becomes can control most effectively the temperature in the environment that will regulate.Therefore, when the cooling load on the air handling system increases, just need refrigeration system that higher capacity is provided.Perhaps, when cooling load reduces, can select less capacity.By selecting suitable capacity, just can raise the efficiency and optimize energy consumption.
One type refrigeration system operation has tandem compressor (tandemcompressor).Though used term " tandem ", and the situation of two compressors will be discussed, have three or even more the system of multi-compressor also be known and can benefit from the present invention.The control tandem compressor is so that it provides the compressed refrigerant of aequum jointly in refrigeration system.Compressor can change its capacity, and tandem compressor is no exception.Therefore, for example in screw compressor (screw compressor), guiding valve is set near the discharge chambe, and can open with the amount of control by the screw compressor refrigerant compressed.In order to realize desirable capacity, be used for the controller of refrigeration system can mobile guiding valve to reach the desired desired volume of environment of regulating (or heating) to be cooled.
Up to the present, also do not develop the controller that is applicable to based on the tandem compressor of the algorithm that valid function is provided.
Summary of the invention
In disclosed embodiment of the present invention, controller can judge which platform tandem compressor moves with the highest percentage of its capacity.If excess capacity, the compressor with the highest percentage operation of its capacity will reduce capacity so.Perhaps, extra if desired capacity utilizes the compressor of the lowest percentage of its heap(ed) capacity will increase its capacity so.In this way, tandem compressor will move in the mode of approximately uniform heap(ed) capacity percentage.The whole efficiency verified, that this running status can elevator system.
In embodiment disclosed by the invention, the electric current that leads to motor will be monitored, and compare with the maximum current that is used for compressor motor (compressor motor).As example, motor is provided with rated load amperage (RLA).By comparing actual current and RLA, just can be similar to and calculate volume percent.Can this percentage of each tandem compressor be compared, move with the highest percentage of its capacity to determine any compressor.As mentioned above, then controller comes the change capacity according to that motor with its highest percentage operation.
By following specification and accompanying drawing, can understand these features of the present invention and further feature well, hereinafter be concise and to the point description.
Description of drawings
Fig. 1 is the schematic diagram that is combined with refrigeration system of the present invention.
Fig. 2 is a flow chart of the present invention.
The specific embodiment
What Fig. 1 described is the refrigeration system 20 with tandem compressor 22 and 24, wherein each tandem compressor 22 and 24 compressed refrigerants and it is conveyed in the discharge line 25 that leads to public discharge line 26.Discharge line 26 is by outdoor heat converter 28 (if refrigeration system 20 is airconditions), and then process expansion gear (expansiondevice) 30.In expansion gear 30 downstreams are indoor heat converter 32 (being the air conditioning pattern equally).If refrigeration system 20 runs on heating mode, cold-producing medium at first can be by being located immediately at the indoor heat converter 32 in compressor 22,24 downstreams.The present invention can expand to the pattern of arbitrary type.
As shown in the figure, need the environment 34 of cooling to receive by evaporimeter 32 driven air.Environment 34 is provided with controller 41, such as Automatic Temperature Control, and comprises temperature sensor.Controller 41 is connected to system controller, or is combined with system controller.Controller 41 provides the indication of cooling load in the system (or heating demand).Usually, the occupant in the environment 34 sets temperature desired at controller 41 places, and 41 running refrigerating systems 20 of controller are to realize temperature desired.Be familiar with as people, humidity control etc. can also be provided.
Cold-producing medium and then enters in the suction line that separates 36 that leads to tandem compressor 22,24 in the downstream of evaporimeter 32 enters public suction line 35.
As mentioned above, controller 41 identification cooling (or heating) loads are to obtain temperature desired in environment 34.Then, controller 41 operational systems comprise stopping/starting compressor 22,24 and opened/closed guiding valve 38.This aspect of the present invention is known.
The present invention relates to a kind of algorithm, it describes in the flow chart of Fig. 2.Usually, the present invention is intended to develop each tandem compressor (the present invention can expand to the situation that surpasses two compressors certainly) so that it is approaching mutually aspect the total capacity percentage of its operation.Therefore, the present invention's monitoring is supplied to the electric current of the motor of compressor 22 and 24 by power supply 39.As shown in flow chart, can determine this actual current of each motor and the ratio of RLA.Then, whether controller 41 inquiry capacity enough satisfy by environment 34 desired loads.If capacity is suitable, algorithm just turns back to first step so.Yet, overhead provision if desired, the compressor that has low ratio-motor so just increases its load.In disclosed embodiment, this just means closed to a certain extent its guiding valve.
On the other hand, if exceed capacity, the compressor that has ceiling rate so just reduces its capacity.Equally, this just means and opens its guiding valve.
Though disclosed is the compressor that has guiding valve, other method that changes capacity also can be with in the present invention.For example, known refrigeration system have can pace of change motor.Such compressor motor also can be used in the inventive method.Equally, though only disclose a kind of method of judging volume percent, other method is also included within the scope of the present invention.
Though disclose the preferred embodiments of the present invention, those of ordinary skill in the art can recognize that some remodeling also falls into scope of the present invention.For this reason, need the research claims, to determine true scope of the present invention and content.
Claims (8)
1. refrigeration system comprises:
At least two compressors, described at least two compressors have variable capacity separately;
Indoor heat converter, expansion gear and outdoor heat converter, and be used for controlling controller by the capacity that each compressor provided of described at least two compressors, described controller can judge whether the capacity that is provided by described at least two compressors enough satisfies the load on the described refrigeration system, and judge increase or reduce described capacity based on this, described controller can judge further which moves with the highest percentage of its heap(ed) capacity in described at least two compressors, need the change capacity in described controller judgement, and judging when need control which described compressor described controller just utilizes with the described judgement of the described the highest percentage operation of its heap(ed) capacity to which compressor in described at least two compressors.
2. refrigeration system according to claim 1 is characterized in that, if be identified as excess capacity, described controller just reduces to have in described at least two compressors the capacity of that compressor of higher percent.
3. refrigeration system according to claim 1 is characterized in that, if the off-capacity that provides, described controller just increases the capacity of that compressor with low percentage in described at least two compressors.
4. refrigeration system according to claim 1, it is characterized in that, described percentage is judged in the following way: the actual current of the motor relevant with each compressor in described at least two compressors is guided in monitoring into, and each described actual current and its rated load of each described motor are compared.
5. the method for a running refrigerating system comprises the steps:
At least two compressors are provided, and every in described at least two compressors has variable capacity separately;
Indoor heat converter, expansion gear and outdoor heat converter are provided, and the controller that is used for controlling described each capacity that provides separately of at least two compressors;
Whether the capacity that judgement is provided by described two compressors at least enough satisfies the load on the described refrigeration system;
Based on this judgement, increase or reduce capacity;
Judge which platform moves with the highest percentage of its heap(ed) capacity in described at least two compressors; And
When described controller judgement needs the change capacity, and which compressor in judging described at least two compressors needs when controlled, and described controller just utilizes the described compressor of which platform with the described judgement of the described the highest percentage operation of its heap(ed) capacity.
6. method according to claim 5 is characterized in that, if be identified as excess capacity, so described controller just reduces to have in described at least two compressors described capacity of that compressor of high percentage.
7. method according to claim 5 is characterized in that, if the off-capacity that provides, so described controller just increases the capacity of that compressor that has low percentage at least in described two compressors.
8. method according to claim 5, it is characterized in that, described percentage is judged in the following way: the actual current of the motor relevant with each compressor in described at least two compressors is led in monitoring, and the described actual current of each described motor and its rated load are compared.
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 (2)
| Publication Number | Publication Date |
|---|---|
| CN101194130A true CN101194130A (en) | 2008-06-04 |
| CN101194130B CN101194130B (en) | 2010-06-16 |
Family
ID=37498743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800499926A Expired - Fee Related CN101194130B (en) | 2005-06-03 | 2005-06-03 | Refrigeration system and operation method thereof |
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) |
Families Citing this family (3)
| 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 |
| US20170241690A1 (en) * | 2016-02-19 | 2017-08-24 | Emerson Climate Technologies, Inc. | Compressor Capacity Modulation System For Multiple Compressors |
Family Cites Families (10)
| 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 |
| US5265434A (en) * | 1979-07-31 | 1993-11-30 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
| US5264434A (en) * | 1988-08-05 | 1993-11-23 | Basf Aktiengesellschaft | Phenoxyalkyl-substituted heteroaromatics and their use for controlling pests |
| US5327742A (en) * | 1993-05-07 | 1994-07-12 | Carrier Corporation | Hierarchial control for discrete chiller units |
| 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 |
| US20040148951A1 (en) * | 2003-01-24 | 2004-08-05 | Bristol Compressors, Inc, | 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 CA CA002606308A patent/CA2606308A1/en not_active Abandoned
- 2005-06-03 EP EP05757068A patent/EP1886074A4/en not_active Withdrawn
- 2005-06-03 WO PCT/US2005/019752 patent/WO2006132626A1/en active Application Filing
- 2005-06-03 CN CN2005800499926A patent/CN101194130B/en not_active Expired - Fee Related
- 2005-06-03 US US11/908,977 patent/US20080190126A1/en not_active Abandoned
-
2008
- 2008-11-25 HK HK08112901.5A patent/HK1121523A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| HK1121523A1 (en) | 2009-04-24 |
| US20080190126A1 (en) | 2008-08-14 |
| CN101194130B (en) | 2010-06-16 |
| CA2606308A1 (en) | 2006-12-14 |
| EP1886074A1 (en) | 2008-02-13 |
| WO2006132626A1 (en) | 2006-12-14 |
| EP1886074A4 (en) | 2012-03-07 |
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