US20060225445A1 - Refrigerant system with variable speed compressor in tandem compressor application - Google Patents
Refrigerant system with variable speed compressor in tandem compressor application Download PDFInfo
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- US20060225445A1 US20060225445A1 US11/101,347 US10134705A US2006225445A1 US 20060225445 A1 US20060225445 A1 US 20060225445A1 US 10134705 A US10134705 A US 10134705A US 2006225445 A1 US2006225445 A1 US 2006225445A1
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- compressor
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- refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/153—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- 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
- F25B2400/13—Economisers
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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
- F25B2600/021—Inverters therefor
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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
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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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
- F25B2600/026—Compressor control by controlling unloaders
- F25B2600/0261—Compressor control by controlling unloaders external to the compressor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- This invention relates to a variable speed motor for driving a compressor that is incorporated into a refrigerant system with tandem compressors.
- Refrigerant systems are utilized in many air conditioning and heat pump applications for cooling and/or heating the air entering an environment.
- the cooling or heating load on the environment may vary with ambient conditions, and as the temperature and/or humidity levels demanded by an occupant of the building change.
- Tandem compressors are essentially at least two compressors operating in parallel, where the compressors are interconnected with each other via common suction and/or discharge manifolds. For instance, a control for the two-compressor system may actuate both of the compressors or either one of the two compressors.
- the two compressors may have different sizes to provide distinct stages of capacity during part-load operation. Rather than having a single level of capacity, a refrigerant system provided with tandem compressors would have several discrete levels of capacity.
- controls can be programmed to optionally actuate the tandem compressors.
- the capacity control provided by the tandem compressors is increased or decreased in large discrete steps. It would be desirable to provide the ability to improve system control capability to continuously vary capacity between these discrete steps to precisely match external load demands at a wide spectrum of environmental conditions.
- Variable speed drives are known for driving compressors at a variable speed in a refrigerant system. By driving the compressor at a higher or lower speed, the amount of refrigerant that is compressed per unit of time changes, and thus the system capacity can be adjusted.
- Variable speed drives have not been utilized in refrigerant systems incorporating tandem compressors, where a selected number of the tandem compressors is driven by a variable speed drive, for the purpose of varying the system capacity to control temperature and humidity levels within the conditioned space.
- a variable speed drive is provided into at least one compressor in a refrigerant system having tandem compressors.
- capacity adjustment between the discrete steps provided by tandem compressor operation can be achieved.
- a control identifies a desired cooling capacity, and then achieves this desired capacity by first actuating the tandem compressors to accurately approximate the necessary capacity in the most efficient and reliable manner. Then, the speed of the at least one compressor provided with variable speed is changed incrementally. The capacity is then monitored. When a desired level is finally achieved, the at least one compressor is operated at that new speed. If the capacity still needs to be adjusted, then the speed is again adjusted incrementally, and the resulting condition is again monitored.
- one of the tandem compressors may be provided with the variable speed drive while the other is not.
- plural compressors are provided with a variable speed drives.
- Embodiments are disclosed which incorporate economizer cycles and unloader cycles into the schematic along with the variable speed drive.
- FIG. 1 shows a first embodiment refrigerant system.
- FIG. 1A shows other possible circuit schematics.
- FIG. 1B shows other possible circuit schematics.
- FIG. 1C shows other possible circuit schematics.
- FIG. 2 shows a second embodiment refrigerant system.
- FIG. 3 shows the capacity control provided by the prior art.
- FIG. 4 shows the capacity control provided by the present invention.
- FIG. 5 is a flowchart of a control algorithm according to the present invention.
- a refrigerant system 20 is illustrated in FIG. 1 .
- a compressor 22 is provided with a variable speed drive 24 .
- a second compressor 26 is not provided with a variable speed drive, and operates in tandem with the compressor 22 .
- a shut-off valve 28 may allow the compressor 26 to be isolated from the discharge manifold, should a control for the system determine that only the compressor 22 is necessary for achieving a given capacity.
- the compressors 22 and 26 deliver refrigerant to a common discharge line 30 leading to a condenser 32 . While the system 20 is illustrated as an air conditioning system, it should be understood that the present invention would also apply to heat pumps and chillers.
- the two compressors 22 and 26 may preferably be provided with distinct capacities such that varying total levels of capacity can be achieved by operating one or the other, or both of the compressors 22 and 26 . In this case, it is at the system designer's discretion to select whether a larger or smaller compressor is provided with a variable speed drive. The decision will depend on many factors including (but not limited to) application requirements, cost, system operation efficiency, etc.
- An expansion device 34 is positioned downstream of the condenser 32 , and an evaporator 36 is located downstream of the expansion device 34 .
- a common suction line 38 leads to distinct suction lines 39 for returning refrigerant to the compressors 22 and 26 .
- an economizer circuit can be incorporated into the FIG. 1 schematic.
- An economizer heat exchanger 40 receives a tapped refrigerant from a line 42 having passed through an economizer expansion device 44 .
- an economizer expansion device 44 As is known, by passing the tapped refrigerant through the expansion device 44 , its pressure and temperature are lowered.
- this tapped refrigerant subcools a refrigerant in a main liquid line 45 , which also passes through the economizer heat exchanger 40 .
- the economizer function is known in the prior art, and allows increased capacity and/or efficiency of the refrigerant system 20 .
- the tapped refrigerant is returned through a line 46 to an intermediate compression point 48 in at least one of the compressors, here illustrated as compressor 22 . While refrigerant in the tap line 42 is shown flowing through the economizer heat exchanger 40 in the same direction as refrigerant in the main liquid line 45 , it should be understood that in a preferred embodiment, the two flows would actually be in counter-flow arrangement.
- a bypass line 50 is also incorporated, and allows a portion of refrigerant from the intermediate compression point 48 in the compressor 22 to be returned to the suction line 39 .
- a valve 52 is opened while the expansion device 44 is preferably (but not necessarily) closed. In this way, refrigerant that has been partially compressed by the compressor 22 will be returned to the suction line 39 , thus providing the unloading function.
- the economized compressor 22 may have more than one injection port 48 and more than one associated economizer heat exchanger 40 .
- the economizer heat exchanger arrangement can be substituted by a flash tank.
- multi-stage compression system may be employed instead of a single economized compressor. In such multi-stage compressor system, one or several of the stages may be provided with a variable speed drive.
- electric motors 200 are associated with fans for blowing the air over the condenser 32 and evaporator 36 .
- One or other of these electric motors 200 may be provided with a variable speed drive 202 .
- a worker of ordinary skill in the art would recognize when the variable speed control of the fan, or other components such as a secondary loop pump, motors associated with the refrigerant system might be desirable.
- FIG. 1A shows another circuit schematic 100 wherein one of the two compressors, e.g. compressor 22 , is replaced by two compressor stages 104 and 106 . While both of the compressor stages 104 and 106 are shown connected to the variable speed drive 102 , only one stage or the other could be connected instead. As shown, the return line 108 from the economizer heat exchanger extends simply between the two stages, rather than into compression chambers in either of the stages.
- FIG. 1B shows another embodiment 110 wherein there are three compressor stages 112 , 114 and 116 .
- the variable speed drive 118 controls both stages 114 and 116 .
- Each of the stages is shown associated with an unloader valve 120 .
- Two separate economizer heat exchangers 122 selectively deliver refrigerant through lines 124 back to points between the compressor stages. It is well known to a person ordinarily skilled in the art that a number of compression stages (as well as a number and particular position of compression stages operating at variable speeds), a number of unloader valves and a number of economizer heat exchangers are at a designer freedom and depend on a particular application.
- FIG. 1C shows another embodiment 130 wherein a first stage of the compressor is provided by a pair of tandem compressors 134 and 136 feeding a second compressor stage 138 . As shown, an intermediate pressure refrigerant return line 140 extends between the stages.
- a variable speed drive 132 is associated with the compressor 134 only.
- many other schematics would come within the scope of this invention, including (but not limited to) a varying number of tandem and variable speed compressors.
- FIG. 2 shows a distinct embodiment 60 , wherein the two tandem compressors are replaced by a bank of four compressors.
- compressors 64 are each provided with a variable speed drive 62 .
- Shut-off valves 66 are placed on the discharge lines for three compressors 64 , 68 and 70 to isolate those compressors when they are stopped by the system control.
- a common discharge manifold 72 leads to a condenser 74 , an expansion device 76 , and an evaporator 78 .
- a control for this refrigerant system 60 is configured to operate the two compressors 64 at variable speeds, and the two compressors 68 and 70 at fixed speed to achieve desired capacity.
- a control for either refrigerant system 20 and 60 is able to identify a desired cooling capacity, and operate the tandem compressors and/or the economizer and unloader functions as necessary.
- FIG. 3 a prior art system that incorporated the FIG. 1 schematic without the variable speed drive could provide at least three stages A, B, and A+B of capacity control.
- the schematic shown in FIG. 1 would have even more stages, in that the operation of the unloader valve and economizer function would provide additional capacity steps.
- the simplified schematic of FIG. 3 will suffice.
- the FIG. 2 embodiment would have many other levels of capacity control available as well.
- FIGS. 3 and 4 are an oversimplification of the FIG. 1 embodiment and the capacity levels it can provide.
- a control for this system would operate one of the compressors (e.g., compressor 26 ) that may be smaller than the compressor 22 to provide the level A.
- the other compressor 22 can be operated to provide the level B, with the compressor 26 stopped.
- the level A+B can be achieved.
- a ramp R above the step A, B, or A+B can be achieved.
- the opposite can occur to move a ramp downwardly from these values.
- a decision of switching between the compressor speed adjustment and moving to a different mode of operation is usually based on the amount of required cooling, efficiency and reliability considerations. For instance, it may be unsafe to operate the compressor below certain speed due to inadequate lubrication provided to compressor elements. On the other hand, running compressor at a relatively high speed may be inefficient in comparison to switching to an economizer mode of operation.
- FIG. 5 shows how the ramps would typically be achieved with a standard variable speed motor control as is known in the prior art.
- Ramps R as shown in FIG. 4 are an oversimplification.
- the control typically moves in incremental steps, and then monitors the operation of the refrigerant cycle after that incremental change.
- there would be a plurality of step changes along each ramp R rather than the infinite number of changes as is illustrated in FIG. 4 .
- FIG. 4 does provide a good illustration of the power of the present invention to provide varying capacity.
- variable speed tandem compressors can be utilized in conjunction with other system components such as fans or pumps also operated at variable speeds.
Abstract
A refrigerant system is provided with tandem compressors. As is known, tandem compressors operate in parallel to provide a refrigerant system designer with the ability to achieve a stepped capacity control of the refrigerant system. At least one of the tandem compressors is provided with a variable speed drive. Further, at least one of the tandem compressors may be provided with the economizer and/or unloader functions. System configurations with multiple compression stages and multiple injection ports are disclosed. In this manner, the stepless capacity control can be achieved.
Description
- This invention relates to a variable speed motor for driving a compressor that is incorporated into a refrigerant system with tandem compressors.
- Refrigerant systems are utilized in many air conditioning and heat pump applications for cooling and/or heating the air entering an environment. The cooling or heating load on the environment may vary with ambient conditions, and as the temperature and/or humidity levels demanded by an occupant of the building change.
- In some refrigerant systems, a single compressor is utilized to compress the refrigerant and move the refrigerant through the cycle connecting indoor and outdoor heat exchangers in a closed loop. However, under many circumstances, it would be desirable to have the ability to vary the capacity, or amount of cooling or heating provided by the refrigerant system. Thus, known refrigerant systems may be provided with tandem compressors. Tandem compressors are essentially at least two compressors operating in parallel, where the compressors are interconnected with each other via common suction and/or discharge manifolds. For instance, a control for the two-compressor system may actuate both of the compressors or either one of the two compressors. The two compressors may have different sizes to provide distinct stages of capacity during part-load operation. Rather than having a single level of capacity, a refrigerant system provided with tandem compressors would have several discrete levels of capacity.
- In the prior art, controls can be programmed to optionally actuate the tandem compressors. However, the capacity control provided by the tandem compressors is increased or decreased in large discrete steps. It would be desirable to provide the ability to improve system control capability to continuously vary capacity between these discrete steps to precisely match external load demands at a wide spectrum of environmental conditions.
- Variable speed drives are known for driving compressors at a variable speed in a refrigerant system. By driving the compressor at a higher or lower speed, the amount of refrigerant that is compressed per unit of time changes, and thus the system capacity can be adjusted.
- Variable speed drives have not been utilized in refrigerant systems incorporating tandem compressors, where a selected number of the tandem compressors is driven by a variable speed drive, for the purpose of varying the system capacity to control temperature and humidity levels within the conditioned space.
- In the disclosed embodiment of this invention, a variable speed drive is provided into at least one compressor in a refrigerant system having tandem compressors. By selectively controlling this one compressor, capacity adjustment between the discrete steps provided by tandem compressor operation can be achieved.
- A control identifies a desired cooling capacity, and then achieves this desired capacity by first actuating the tandem compressors to accurately approximate the necessary capacity in the most efficient and reliable manner. Then, the speed of the at least one compressor provided with variable speed is changed incrementally. The capacity is then monitored. When a desired level is finally achieved, the at least one compressor is operated at that new speed. If the capacity still needs to be adjusted, then the speed is again adjusted incrementally, and the resulting condition is again monitored.
- In disclosed embodiments, one of the tandem compressors may be provided with the variable speed drive while the other is not. In other embodiments, plural compressors are provided with a variable speed drives.
- Embodiments are disclosed which incorporate economizer cycles and unloader cycles into the schematic along with the variable speed drive.
- These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
-
FIG. 1 shows a first embodiment refrigerant system. -
FIG. 1A shows other possible circuit schematics. -
FIG. 1B shows other possible circuit schematics. -
FIG. 1C shows other possible circuit schematics. -
FIG. 2 shows a second embodiment refrigerant system. -
FIG. 3 shows the capacity control provided by the prior art. -
FIG. 4 shows the capacity control provided by the present invention. -
FIG. 5 is a flowchart of a control algorithm according to the present invention. - A
refrigerant system 20 is illustrated inFIG. 1 . Acompressor 22 is provided with avariable speed drive 24. Asecond compressor 26 is not provided with a variable speed drive, and operates in tandem with thecompressor 22. As shown, a shut-offvalve 28 may allow thecompressor 26 to be isolated from the discharge manifold, should a control for the system determine that only thecompressor 22 is necessary for achieving a given capacity. As is known, thecompressors common discharge line 30 leading to acondenser 32. While thesystem 20 is illustrated as an air conditioning system, it should be understood that the present invention would also apply to heat pumps and chillers. - As is known, the two
compressors compressors expansion device 34 is positioned downstream of thecondenser 32, and anevaporator 36 is located downstream of theexpansion device 34. Acommon suction line 38 leads todistinct suction lines 39 for returning refrigerant to thecompressors - As also shown, an economizer circuit can be incorporated into the
FIG. 1 schematic. Aneconomizer heat exchanger 40 receives a tapped refrigerant from aline 42 having passed through aneconomizer expansion device 44. As is known, by passing the tapped refrigerant through theexpansion device 44, its pressure and temperature are lowered. Thus, in theeconomizer heat exchanger 40, this tapped refrigerant subcools a refrigerant in a mainliquid line 45, which also passes through theeconomizer heat exchanger 40. The economizer function is known in the prior art, and allows increased capacity and/or efficiency of therefrigerant system 20. - As shown, the tapped refrigerant is returned through a
line 46 to anintermediate compression point 48 in at least one of the compressors, here illustrated ascompressor 22. While refrigerant in thetap line 42 is shown flowing through theeconomizer heat exchanger 40 in the same direction as refrigerant in the mainliquid line 45, it should be understood that in a preferred embodiment, the two flows would actually be in counter-flow arrangement. - A
bypass line 50 is also incorporated, and allows a portion of refrigerant from theintermediate compression point 48 in thecompressor 22 to be returned to thesuction line 39. When it is desired to have unloaded operation, avalve 52 is opened while theexpansion device 44 is preferably (but not necessarily) closed. In this way, refrigerant that has been partially compressed by thecompressor 22 will be returned to thesuction line 39, thus providing the unloading function. - It has to be understood that the
economized compressor 22 may have more than oneinjection port 48 and more than one associatedeconomizer heat exchanger 40. Also, as known, the economizer heat exchanger arrangement can be substituted by a flash tank. Further, multi-stage compression system may be employed instead of a single economized compressor. In such multi-stage compressor system, one or several of the stages may be provided with a variable speed drive. - As shown,
electric motors 200 are associated with fans for blowing the air over thecondenser 32 andevaporator 36. One or other of theseelectric motors 200 may be provided with avariable speed drive 202. A worker of ordinary skill in the art would recognize when the variable speed control of the fan, or other components such as a secondary loop pump, motors associated with the refrigerant system might be desirable. -
FIG. 1A shows another circuit schematic 100 wherein one of the two compressors,e.g. compressor 22, is replaced by twocompressor stages variable speed drive 102, only one stage or the other could be connected instead. As shown, thereturn line 108 from the economizer heat exchanger extends simply between the two stages, rather than into compression chambers in either of the stages. -
FIG. 1B shows anotherembodiment 110 wherein there are threecompressor stages variable speed drive 118 controls bothstages 114 and 116. Each of the stages is shown associated with anunloader valve 120. Two separate economizer heat exchangers 122 selectively deliver refrigerant throughlines 124 back to points between the compressor stages. It is well known to a person ordinarily skilled in the art that a number of compression stages (as well as a number and particular position of compression stages operating at variable speeds), a number of unloader valves and a number of economizer heat exchangers are at a designer freedom and depend on a particular application. -
FIG. 1C shows anotherembodiment 130 wherein a first stage of the compressor is provided by a pair oftandem compressors second compressor stage 138. As shown, an intermediate pressurerefrigerant return line 140 extends between the stages. Avariable speed drive 132 is associated with thecompressor 134 only. Of course, many other schematics would come within the scope of this invention, including (but not limited to) a varying number of tandem and variable speed compressors. -
FIG. 2 shows adistinct embodiment 60, wherein the two tandem compressors are replaced by a bank of four compressors. As shown,compressors 64 are each provided with avariable speed drive 62. Shut-offvalves 66 are placed on the discharge lines for threecompressors common discharge manifold 72 leads to acondenser 74, anexpansion device 76, and anevaporator 78. A control for thisrefrigerant system 60 is configured to operate the twocompressors 64 at variable speeds, and the twocompressors - A control for either
refrigerant system FIG. 3 , a prior art system that incorporated theFIG. 1 schematic without the variable speed drive could provide at least three stages A, B, and A+B of capacity control. In fact, the schematic shown inFIG. 1 would have even more stages, in that the operation of the unloader valve and economizer function would provide additional capacity steps. However, for purposes of understanding the remainder of this invention, the simplified schematic ofFIG. 3 will suffice. As can be seen, there are several values between values A, B, and A+B that cannot be provided by this prior art system. This is, of course, an oversimplification of the system, yet this does provide a good basis for understanding the present invention. TheFIG. 2 embodiment would have many other levels of capacity control available as well. -
FIGS. 3 and 4 are an oversimplification of theFIG. 1 embodiment and the capacity levels it can provide. As mentioned, by operating the unloader valve and economizer function, additional capacity steps can be achieved. However, a control for this system would operate one of the compressors (e.g., compressor 26) that may be smaller than thecompressor 22 to provide the level A. Theother compressor 22 can be operated to provide the level B, with thecompressor 26 stopped. By operating bothcompressors compressor 22, a ramp R above the step A, B, or A+B can be achieved. On the other hand, by slowing the speed, the opposite can occur to move a ramp downwardly from these values. A decision of switching between the compressor speed adjustment and moving to a different mode of operation is usually based on the amount of required cooling, efficiency and reliability considerations. For instance, it may be unsafe to operate the compressor below certain speed due to inadequate lubrication provided to compressor elements. On the other hand, running compressor at a relatively high speed may be inefficient in comparison to switching to an economizer mode of operation. -
FIG. 5 shows how the ramps would typically be achieved with a standard variable speed motor control as is known in the prior art. Ramps R as shown inFIG. 4 are an oversimplification. In fact, the control typically moves in incremental steps, and then monitors the operation of the refrigerant cycle after that incremental change. Thus, there would be a plurality of step changes along each ramp R, rather than the infinite number of changes as is illustrated inFIG. 4 . However,FIG. 4 does provide a good illustration of the power of the present invention to provide varying capacity. - It has to be noted that variable speed tandem compressors can be utilized in conjunction with other system components such as fans or pumps also operated at variable speeds.
- Although preferred embodiments of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
Claims (20)
1. A refrigerant system comprising:
at least two tandem compressors operating in parallel, with at least one compressor having a variable speed drive for varying a speed of said at least one compressor;
a condenser downstream of said compressor and an evaporator downstream of said condenser; and
a control for selectively varying said speed of said at least one compressor.
2. The refrigerant system as set forth in claim 1 , wherein an economizer heat exchanger is positioned intermediate to said condenser and said evaporator, said economizer heat exchanger selectively receiving a tapped refrigerant to subcool a main refrigerant flow passing through said economizer heat exchanger, and said tapped refrigerant being returned to least one of said compressors and said control being operable to vary the speed of at least said one compressor to provide variation in capacity control between a level with said economizer heat exchanger operational, and a level without said economizer heat exchanger operational.
3. The refrigerant system as set forth in claim 2 , wherein there are a plurality of intermediate ports where said tapped refrigerant is returned to said at least one of said compressors.
4. The refrigerant system as set forth in claim 1 , wherein at least one of said two tandem compressors is provided by a multi-stage compressor.
5. The refrigerant system as set forth in claim 1 , wherein said control changing said speed of said at least one compressor in incremental steps.
6. The refrigerant system as set forth in claim 1 , wherein at least one of said at least two compressors is provided with an unloader function.
7. The refrigerant system as set forth in claim 1 , wherein at least one of said at least two compressors is not provided with a variable speed drive.
8. The refrigerant system as set forth in claim 1 , wherein there are more than two of said at least two compressors, and at least two of said compressors are provided with a variable speed drive.
9. The refrigerant system as set forth in claim 1 , wherein a fan or pump associated with a component other than the compressor is also provided with the variable speed drive.
10. The refrigerant system as set forth in claim 1 , wherein said at least two compressors have different capacities.
11. A method of controlling a refrigerant system comprising the steps of:
(1) providing at least two tandem compressors operating in parallel, with at least one compressor having a variable speed drive for varying a speed of said at least one compressor, providing a condenser downstream of said compressor and an evaporator downstream of said condenser, and a control for selectively varying said speed of said at least one compressor to achieve varying levels of capacity control; and
(2) determining a desired capacity, and operating one or the other, or both of said at least two compressors, and varying a speed of said at least one compressor to achieve said determined desired capacity.
12. The method as set forth in claim 11 , wherein an economizer function is provided with the refrigerant system, and selectively actuating said economizer function to provide additional capacity or increase operation efficiency if necessary to achieve the desired capacity of step 2.
13. The method as set forth in claim 12 , wherein refrigerant from corresponding economizer heat exchangers is returned to a plurality of ports associated with said at least two tandem compressors.
14. The method as set forth in claim 11 , wherein at least one of said at least two compressors is provided by a multi-stage compressor.
15. The method as set forth in claim 11 , wherein said control changes said speed of said at least one compressor in incremental steps.
16. The method as set forth in claim 11 , wherein an unloader function is provided to unload at least one of said at least two compressors o achieve the desired capacity of step 2.
17. The method as set forth in claim 11 , wherein at least one of said at least two compressors is not provided with a variable speed drive.
18. The method as set forth in claim 11 , wherein there are more than two of said at least two compressors, and at least two of said compressors being provided with a variable speed drive, and said control varying the speed of said at least two variable speed driven compressors.
19. The method as set forth in claim 11 , wherein said at least two compressors are provided with different capacities.
20. The method as set forth in claim 11 , wherein at least one fan or pump associated with another component in said refrigerant system is provided with a variable speed drive.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/101,347 US20060225445A1 (en) | 2005-04-07 | 2005-04-07 | Refrigerant system with variable speed compressor in tandem compressor application |
CNA2006800111652A CN101156029A (en) | 2005-04-07 | 2006-02-14 | Refrigerant system with variable speed compressor in tandem compressor application |
PCT/US2006/005157 WO2006110209A2 (en) | 2005-04-07 | 2006-02-14 | Refrigerant system with variable speed compressor in tandem compressor application |
CA002598706A CA2598706A1 (en) | 2005-04-07 | 2006-02-14 | Refrigerant system with variable speed compressor in tandem compressor application |
EP06720737A EP1866576A4 (en) | 2005-04-07 | 2006-02-14 | Refrigerant system with variable speed compressor in tandem compressor application |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/101,347 US20060225445A1 (en) | 2005-04-07 | 2005-04-07 | Refrigerant system with variable speed compressor in tandem compressor application |
Publications (1)
Publication Number | Publication Date |
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US20060225445A1 true US20060225445A1 (en) | 2006-10-12 |
Family
ID=37081837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/101,347 Abandoned US20060225445A1 (en) | 2005-04-07 | 2005-04-07 | Refrigerant system with variable speed compressor in tandem compressor application |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060225445A1 (en) |
EP (1) | EP1866576A4 (en) |
CN (1) | CN101156029A (en) |
CA (1) | CA2598706A1 (en) |
WO (1) | WO2006110209A2 (en) |
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US20100199715A1 (en) * | 2007-09-24 | 2010-08-12 | Alexander Lifson | Refrigerant system with bypass line and dedicated economized flow compression chamber |
JP2010210205A (en) * | 2009-03-12 | 2010-09-24 | Daikin Ind Ltd | Refrigerating device and method for operating the same |
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US20110072837A1 (en) * | 2009-09-30 | 2011-03-31 | Thermo Fisher Scientific (Asheville) Llc | Refrigeration system mounted within a deck |
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US20220397119A1 (en) * | 2021-06-14 | 2022-12-15 | Air Products And Chemicals, Inc. | Method and apparatus for compressing a gas feed with a variable flow rate |
US11592215B2 (en) | 2018-08-29 | 2023-02-28 | Waterfurnace International, Inc. | Integrated demand water heating using a capacity modulated heat pump with desuperheater |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2246244A (en) * | 1940-06-19 | 1941-06-17 | York Ice Machinery Corp | Refrigeration |
US3250931A (en) * | 1962-12-31 | 1966-05-10 | James A Hardman | Piston-ported volume displacement means accommodating multiple, work effecting components |
US4895005A (en) * | 1988-12-29 | 1990-01-23 | York International Corporation | Motor terminal box mounted solid state starter |
US4947655A (en) * | 1984-01-11 | 1990-08-14 | Copeland Corporation | Refrigeration system |
US5265434A (en) * | 1979-07-31 | 1993-11-30 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US5927088A (en) * | 1996-02-27 | 1999-07-27 | Shaw; David N. | Boosted air source heat pump |
US6434960B1 (en) * | 2001-07-02 | 2002-08-20 | Carrier Corporation | Variable speed drive chiller system |
US6516622B1 (en) * | 2000-06-13 | 2003-02-11 | Belair Technologies, Llc | Method and apparatus for variable frequency controlled compressor and fan |
US20030084674A1 (en) * | 2001-10-22 | 2003-05-08 | Masahiro Kawaguchi | Variable displacement type compressor, air conditioner with the variable displacement type compressor, and method for controlling displacement in the variable displacement type compressor |
US6659726B2 (en) * | 2001-12-31 | 2003-12-09 | Carrier Corporation | Variable speed control of multiple motors |
US6705097B2 (en) * | 2002-07-03 | 2004-03-16 | Lg Electronics Inc. | Compressor-controlling device and method for air conditioner comprising a plurality of compressors |
US6772607B2 (en) * | 2000-02-14 | 2004-08-10 | Hitachi, Ltd. | Refrigerating device |
US6883341B1 (en) * | 2003-11-10 | 2005-04-26 | Carrier Corporation | Compressor with unloader valve between economizer line and evaporator inlet |
US6928828B1 (en) * | 2004-01-22 | 2005-08-16 | Carrier Corporation | Tandem compressors with economized operation |
US20050188708A1 (en) * | 2004-02-27 | 2005-09-01 | York International Corporation | System and method for variable speed operation of a screw compressor |
US6973797B2 (en) * | 2004-05-10 | 2005-12-13 | York International Corporation | Capacity control for economizer refrigeration systems |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4951475A (en) * | 1979-07-31 | 1990-08-28 | Altech Controls Corp. | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US4748820A (en) * | 1984-01-11 | 1988-06-07 | Copeland Corporation | Refrigeration system |
US4787211A (en) * | 1984-07-30 | 1988-11-29 | Copeland Corporation | Refrigeration system |
DE19620105A1 (en) * | 1996-04-23 | 1997-10-30 | Bruno Pfurtscheller | Operation of refrigerating plant |
JP3680619B2 (en) * | 1999-03-10 | 2005-08-10 | 株式会社日立製作所 | Refrigeration equipment |
DE10118444A1 (en) * | 2001-04-12 | 2002-10-17 | Linde Ag | Compressor set and method for regulating a compressor set |
JP4214021B2 (en) * | 2003-08-20 | 2009-01-28 | ヤンマー株式会社 | Engine heat pump |
-
2005
- 2005-04-07 US US11/101,347 patent/US20060225445A1/en not_active Abandoned
-
2006
- 2006-02-14 WO PCT/US2006/005157 patent/WO2006110209A2/en active Application Filing
- 2006-02-14 CA CA002598706A patent/CA2598706A1/en not_active Abandoned
- 2006-02-14 CN CNA2006800111652A patent/CN101156029A/en active Pending
- 2006-02-14 EP EP06720737A patent/EP1866576A4/en not_active Withdrawn
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2246244A (en) * | 1940-06-19 | 1941-06-17 | York Ice Machinery Corp | Refrigeration |
US3250931A (en) * | 1962-12-31 | 1966-05-10 | James A Hardman | Piston-ported volume displacement means accommodating multiple, work effecting components |
US5265434A (en) * | 1979-07-31 | 1993-11-30 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US4947655A (en) * | 1984-01-11 | 1990-08-14 | Copeland Corporation | Refrigeration system |
US4895005A (en) * | 1988-12-29 | 1990-01-23 | York International Corporation | Motor terminal box mounted solid state starter |
US5927088A (en) * | 1996-02-27 | 1999-07-27 | Shaw; David N. | Boosted air source heat pump |
US6772607B2 (en) * | 2000-02-14 | 2004-08-10 | Hitachi, Ltd. | Refrigerating device |
US6516622B1 (en) * | 2000-06-13 | 2003-02-11 | Belair Technologies, Llc | Method and apparatus for variable frequency controlled compressor and fan |
US6434960B1 (en) * | 2001-07-02 | 2002-08-20 | Carrier Corporation | Variable speed drive chiller system |
USRE39597E1 (en) * | 2001-07-02 | 2007-05-01 | Carrier Corporation | Variable speed drive chiller system |
US20030084674A1 (en) * | 2001-10-22 | 2003-05-08 | Masahiro Kawaguchi | Variable displacement type compressor, air conditioner with the variable displacement type compressor, and method for controlling displacement in the variable displacement type compressor |
US6659726B2 (en) * | 2001-12-31 | 2003-12-09 | Carrier Corporation | Variable speed control of multiple motors |
US6705097B2 (en) * | 2002-07-03 | 2004-03-16 | Lg Electronics Inc. | Compressor-controlling device and method for air conditioner comprising a plurality of compressors |
US6883341B1 (en) * | 2003-11-10 | 2005-04-26 | Carrier Corporation | Compressor with unloader valve between economizer line and evaporator inlet |
US6928828B1 (en) * | 2004-01-22 | 2005-08-16 | Carrier Corporation | Tandem compressors with economized operation |
US20050188708A1 (en) * | 2004-02-27 | 2005-09-01 | York International Corporation | System and method for variable speed operation of a screw compressor |
US6973797B2 (en) * | 2004-05-10 | 2005-12-13 | York International Corporation | Capacity control for economizer refrigeration systems |
Cited By (106)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070056300A1 (en) * | 2004-04-12 | 2007-03-15 | Johnson Controls Technology Company | System and method for capacity control in a multiple compressor chiller system |
US7793509B2 (en) * | 2004-04-12 | 2010-09-14 | Johnson Controls Technology Company | System and method for capacity control in a multiple compressor chiller system |
US7628027B2 (en) * | 2005-07-19 | 2009-12-08 | Hussmann Corporation | Refrigeration system with mechanical subcooling |
US20070017240A1 (en) * | 2005-07-19 | 2007-01-25 | Hussmann Corporation | Refrigeration system with mechanical subcooling |
US20070187086A1 (en) * | 2006-02-14 | 2007-08-16 | Anatoly Nikolayevich Ivanov | Device for cutting slot-shaped seats in wells by hydro-sandblasting method |
US9746218B2 (en) | 2006-10-26 | 2017-08-29 | Johnson Controls Technology Company | Economized refrigeration system |
US20080098754A1 (en) * | 2006-10-26 | 2008-05-01 | Johnson Controls Technology Company | Economized refrigeration system |
WO2008063256A1 (en) * | 2006-10-26 | 2008-05-29 | Johnson Controls Technology Company | Economized refrigeration system |
WO2008079129A1 (en) * | 2006-12-26 | 2008-07-03 | Carrier Corporation | Refrigerant system with economizer, intercooler and multi-stage compressor |
US20100058781A1 (en) * | 2006-12-26 | 2010-03-11 | Alexander Lifson | Refrigerant system with economizer, intercooler and multi-stage compressor |
EP2097686A4 (en) * | 2006-12-26 | 2010-03-10 | Carrier Corp | Co2 refrigerant system with tandem compressors, expander and economizer |
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US20100071391A1 (en) * | 2006-12-26 | 2010-03-25 | Carrier Corporation | Co2 refrigerant system with tandem compressors, expander and economizer |
WO2008079128A1 (en) | 2006-12-26 | 2008-07-03 | Carrier Corporation | Co2 refrigerant system with tandem compressors, expander and economizer |
US20100005820A1 (en) * | 2007-01-24 | 2010-01-14 | Technotrans Ag | Cooling Device for Printing Machines |
US20100005831A1 (en) * | 2007-02-02 | 2010-01-14 | Carrier Corporation | Enhanced refrigerant system |
WO2008094157A1 (en) * | 2007-02-02 | 2008-08-07 | Carrier Corporation | Enhanced refrigerant system |
US20100043475A1 (en) * | 2007-04-23 | 2010-02-25 | Taras Michael F | Co2 refrigerant system with booster circuit |
CN101688695A (en) * | 2007-04-23 | 2010-03-31 | 开利公司 | Co2 refrigerant system with booster circuit |
EP2149018A1 (en) * | 2007-04-24 | 2010-02-03 | Carrier Corporation | Refrigerant vapor compression system with dual economizer circuits |
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US8561425B2 (en) | 2007-04-24 | 2013-10-22 | Carrier Corporation | Refrigerant vapor compression system with dual economizer circuits |
US20100199715A1 (en) * | 2007-09-24 | 2010-08-12 | Alexander Lifson | Refrigerant system with bypass line and dedicated economized flow compression chamber |
WO2009048463A1 (en) * | 2007-10-10 | 2009-04-16 | Carrier Corporation | Multi-stage refrigerant system with different compressor types |
WO2009048464A1 (en) * | 2007-10-10 | 2009-04-16 | Carrier Corporation | Tandem compressors of different types |
US20110094259A1 (en) * | 2007-10-10 | 2011-04-28 | Alexander Lifson | Multi-stage refrigerant system with different compressor types |
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US20090217679A1 (en) * | 2008-02-28 | 2009-09-03 | Optidyn Inc. | Refrigeration cooling system control |
US20090241595A1 (en) * | 2008-03-27 | 2009-10-01 | Praxair Technology, Inc. | Distillation method and apparatus |
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US20120017620A1 (en) * | 2009-01-20 | 2012-01-26 | Panasonic Corporation | Refrigeration cycle apparatus |
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US20120055184A1 (en) * | 2009-03-31 | 2012-03-08 | Mitsubishi Heavy Industries, Ltd. | Centrifugal-chiller and method for controlling the same |
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US9945597B2 (en) | 2010-07-09 | 2018-04-17 | Gea Refrigeration Germany Gmbh | Refrigeration system for cooling a container |
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WO2012003906A3 (en) * | 2010-07-09 | 2012-03-08 | Gea Refrigeration Germany Gmbh | Refrigeration system for cooling a container |
US9038404B2 (en) * | 2011-04-19 | 2015-05-26 | Liebert Corporation | High efficiency cooling system |
US20130098085A1 (en) * | 2011-04-19 | 2013-04-25 | Liebert Corporation | High efficiency cooling system |
US8881541B2 (en) * | 2011-04-19 | 2014-11-11 | Liebert Corporation | Cooling system with tandem compressors and electronic expansion valve control |
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FR2977656A1 (en) * | 2011-07-06 | 2013-01-11 | Electricite De France | THERMAL EXCHANGE SYSTEM AND METHOD FOR CONTROLLING THERMAL POWER DEVELOPED BY SUCH THERMAL EXCHANGE SYSTEM |
WO2013004972A1 (en) * | 2011-07-06 | 2013-01-10 | Electricite De France | Heat exchange system and method for regulating a heat power developed by such a heat exchange system |
US20140151015A1 (en) * | 2011-07-26 | 2014-06-05 | Carrier Corporation | Termperature Control Logic For Refrigeration System |
US8925346B2 (en) | 2012-02-07 | 2015-01-06 | Thermo Fisher Scientific (Asheville) Llc | High performance freezer having cylindrical cabinet |
DE102013200473A1 (en) * | 2013-01-15 | 2014-07-17 | Krones Ag | Method and device for cooling a fermentation and / or storage tank |
US9599118B2 (en) | 2013-04-04 | 2017-03-21 | Trane International Inc. | System and method for controlling a system that includes fixed speed and variable speed compressors |
US11092151B2 (en) | 2013-04-04 | 2021-08-17 | Trane International Inc. | System and method for controlling a system that includes fixed speed and variable speed compressors |
JP2015098973A (en) * | 2013-11-19 | 2015-05-28 | 株式会社Nttファシリティーズ | Refrigerator |
US9759468B2 (en) * | 2014-03-21 | 2017-09-12 | Lennox Industries Inc. | System for controlling operation of an HVAC system having tandem compressors |
US20150267952A1 (en) * | 2014-03-21 | 2015-09-24 | Lennox Industries Inc. | System for controlling operation of an hvac system having tandem compressors |
US10753661B2 (en) | 2014-09-26 | 2020-08-25 | Waterfurnace International, Inc. | Air conditioning system with vapor injection compressor |
US11480372B2 (en) | 2014-09-26 | 2022-10-25 | Waterfurnace International Inc. | Air conditioning system with vapor injection compressor |
US11927377B2 (en) | 2014-09-26 | 2024-03-12 | Waterfurnace International, Inc. | Air conditioning system with vapor injection compressor |
US10119738B2 (en) | 2014-09-26 | 2018-11-06 | Waterfurnace International Inc. | Air conditioning system with vapor injection compressor |
US10422563B2 (en) * | 2015-05-11 | 2019-09-24 | Lg Electronics Inc. | Refrigerator and control method thereof |
US11448430B2 (en) | 2016-07-08 | 2022-09-20 | Climate Master, Inc. | Heat pump and water heater |
US10871314B2 (en) | 2016-07-08 | 2020-12-22 | Climate Master, Inc. | Heat pump and water heater |
US10866002B2 (en) | 2016-11-09 | 2020-12-15 | Climate Master, Inc. | Hybrid heat pump with improved dehumidification |
US11435095B2 (en) | 2016-11-09 | 2022-09-06 | Climate Master, Inc. | Hybrid heat pump with improved dehumidification |
US20180160570A1 (en) * | 2016-12-02 | 2018-06-07 | Dell Products L.P. | Dynamic cooling system |
US10856449B2 (en) * | 2016-12-02 | 2020-12-01 | Dell Products L.P. | Dynamic cooling system |
US10566881B2 (en) | 2017-01-27 | 2020-02-18 | Franklin Electric Co., Inc. | Motor drive system including removable bypass circuit and/or cooling features |
US11018610B2 (en) | 2017-01-27 | 2021-05-25 | Franklin Electric Co., Inc. | Motor drive system and method |
US11349419B2 (en) | 2017-01-27 | 2022-05-31 | Franklin Electric Co., Inc. | Motor drive system including removable bypass circuit and/or cooling features |
US10731901B2 (en) | 2017-03-21 | 2020-08-04 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
US11274862B2 (en) | 2017-03-21 | 2022-03-15 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in multi-compressor systems |
US10495365B2 (en) | 2017-03-21 | 2019-12-03 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
US11415347B2 (en) | 2017-03-21 | 2022-08-16 | Lennox Industries Inc. | Method and apparatus for balanced fluid distribution in tandem-compressor systems |
US10655897B2 (en) | 2017-03-21 | 2020-05-19 | Lennox Industries Inc. | Method and apparatus for common pressure and oil equalization in multi-compressor systems |
US10465937B2 (en) | 2017-08-08 | 2019-11-05 | Lennox Industries Inc. | Hybrid tandem compressor system and method of use |
US10935274B2 (en) | 2017-08-08 | 2021-03-02 | Lennox Industries Inc. | Hybrid tandem compressor system and method of use |
EP3441698A1 (en) * | 2017-08-08 | 2019-02-13 | Lennox Industries Inc. | Hybrid tandem compressor system and control method |
US10935260B2 (en) | 2017-12-12 | 2021-03-02 | Climate Master, Inc. | Heat pump with dehumidification |
US11906226B2 (en) * | 2018-04-16 | 2024-02-20 | Carrier Corporation | Dual compressor heat pump |
US20210033315A1 (en) * | 2018-04-16 | 2021-02-04 | Carrier Corporation | Dual Compressor Heat Pump |
US11397034B2 (en) | 2018-06-27 | 2022-07-26 | Carrier Corporation | Unloading system for variable speed compressor |
US11592215B2 (en) | 2018-08-29 | 2023-02-28 | Waterfurnace International, Inc. | Integrated demand water heating using a capacity modulated heat pump with desuperheater |
US11953239B2 (en) | 2018-08-29 | 2024-04-09 | Waterfurnace International, Inc. | Integrated demand water heating using a capacity modulated heat pump with desuperheater |
US11506430B2 (en) | 2019-07-15 | 2022-11-22 | Climate Master, Inc. | Air conditioning system with capacity control and controlled hot water generation |
CN110356283A (en) * | 2019-07-31 | 2019-10-22 | 重庆长安汽车股份有限公司 | A kind of heat management system of Vehicular dynamic battery |
US11585581B2 (en) | 2020-08-07 | 2023-02-21 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
US11131491B1 (en) | 2020-08-07 | 2021-09-28 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
US20220397119A1 (en) * | 2021-06-14 | 2022-12-15 | Air Products And Chemicals, Inc. | Method and apparatus for compressing a gas feed with a variable flow rate |
US20230288093A1 (en) * | 2022-03-11 | 2023-09-14 | Johnson Controls Tyco IP Holdings LLP | Energy efficient heat pump systems and methods |
US11906188B2 (en) * | 2022-03-11 | 2024-02-20 | Johnson Controls Tyco IP Holdings LLP | Energy efficient heat pump systems and methods |
Also Published As
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CN101156029A (en) | 2008-04-02 |
EP1866576A4 (en) | 2010-07-21 |
EP1866576A2 (en) | 2007-12-19 |
WO2006110209A2 (en) | 2006-10-19 |
CA2598706A1 (en) | 2006-10-19 |
WO2006110209A3 (en) | 2007-09-20 |
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