EP2482012B1 - Vorheizsteuerung für Kompressormotoren - Google Patents

Vorheizsteuerung für Kompressormotoren Download PDF

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Publication number
EP2482012B1
EP2482012B1 EP11195836.9A EP11195836A EP2482012B1 EP 2482012 B1 EP2482012 B1 EP 2482012B1 EP 11195836 A EP11195836 A EP 11195836A EP 2482012 B1 EP2482012 B1 EP 2482012B1
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EP
European Patent Office
Prior art keywords
compressor
motor
idle
compressors
temperature
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Active
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EP11195836.9A
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English (en)
French (fr)
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EP2482012A3 (de
EP2482012A2 (de
Inventor
Joseph A. Giunta
Robert M. Deroy
Richard Rusich
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Hamilton Sundstrand Corp
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Hamilton Sundstrand Corp
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Publication of EP2482012A3 publication Critical patent/EP2482012A3/de
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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
    • F25B49/025—Motor 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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures
    • 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
    • F25B2600/23—Time delays
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21156—Temperatures of a compressor or the drive means therefor of the motor

Definitions

  • the present invention relates to vapor cycle systems having a compressor, and more particularly to vapor cycle systems and methods of operating the same to reduce flooded compressor startup conditions and/or lubrication accumulation in the idle compressors of multi-compressor systems.
  • Vapor cycle systems are known for providing cooling in a variety of contexts.
  • a refrigerant is compressed and expanded in a cyclical manner to transfer thermal energy and help cool a given airspace or fluid.
  • Some VCSs have a dual compressor configuration, with two compressors operable within the same overall refrigerant circuit.
  • US 2007/056300 A1 discloses a vapor cycle system with a first and second compressor in parallel and the associated control thereof.
  • a method of controlling a vapor cycle system having first and second compressors according to claim 1 is disclosed.
  • the present invention provides a vapor cycle system according to claim 9.
  • the present invention relates to multi-compressor vapor cycle system (VCS) and associated control logic.
  • VCS multi-compressor vapor cycle system
  • the present inventors have discovered a problem with dual compressor VCSs when one compressor is idle, that is not operating to compress refrigerant, whereby liquid state refrigerant and/or lubricant can migrate to the idle compressor.
  • Migrating fluid can undesirably starve the active compressor of lubricant and negatively impact system performance, resulting in reduced cooling effectiveness as well as potential failure of the operating compressor.
  • the idle compressor flooded with liquid refrigerant and/or lubricant can experience difficulties at startup when requested to operate (called a "flooded start"), which can lead to reliability issues.
  • the compressors are connected in parallel, which allows fluid to pass between the compressors and into the idle compressor.
  • Each compressor can be selectively activated based on desired cooling capacity, such that both compressors or only one of them are operating simultaneously to compress refrigerant.
  • the control logic provides heating to an idle compressor to reduce or eliminate migration of refrigerant and/or lubricant in a liquid state into the idle compressor.
  • the idle compressor has an electric motor that can be used to generate heat that reduces migration of liquids and tends to drive out or evaporate any liquids that may be present.
  • a preheat mode of the idle compressor generates heat with windings of the idle compressor motor to a given motor temperature range (e.g., 48.9°C (120°F) to 54.4°C (130°F)), controlled by sensing the motor temperature with a suitable sensor, such as a thermistor.
  • a suitable sensor such as a thermistor.
  • the system can further optionally provide a failsafe timer mechanism to prevent overheating in the event of a failure of the temperature sensor.
  • the preheating mode of the idle compressor is cycled on (i.e., operated) for a given time period (e.g., 14 minutes), and can then by cycled off for a given delay period (e.g., 30 minutes) before the preheating time period is reactivated, thereby providing the optional failsafe time functionality.
  • a given time period e.g. 14 minutes
  • a given delay period e.g. 30 minutes
  • an active (non-idle) compressor is not starved of refrigerant during operation due to migration of fluid to the idle compressor.
  • the preheat mode helps reduce a risk of a flooded start when the idle compressor is activated to begin compressing refrigerant.
  • a preheating mode is provided that is controlled based on sensed motor temperature, such as using sensed resistance through a thermistor, and can be implemented in single or multi-compressor VCSs.
  • FIG. 1 is a block diagram schematically illustrating one embodiment of a dual compressor VCS 10 that includes a vapor cycle circuit 12, a compressor 14, a compressor 16, and a control module 18.
  • Each compressor 14 and 16 includes an electric motor 14-1 and 16-1, respectively, and can be of any suitable type (e.g., scroll, reciprocating, etc.).
  • the electric motors 14-1 and 16-1 can include suitable windings, etc., and can have a conventional configuration.
  • the compressors 14 and 16 can each be connected to a common suction port manifold 20 and a common discharge port manifold 26, with each manifold 20 and 26 connected in fluid communication with the vapor cycle circuit 12. In the illustrated embodiment, the compressors 14 and 16 are connected to the vapor cycle circuit 12 in parallel. Common discharge and suction manifolds can be omitted in alternative embodiments, with separate discharge and suction ports for each compressor 14 and 16.
  • a temperature sensor 28 and 30 is provided for each compressor 14 and 16, respectively, to sense a motor temperature of the compressor 14 or 16.
  • the sensors 28 and 30 are thermistors that allow temperature sensing by changing resistance as a function of temperature.
  • a motor controller 32 and 34 is provided from each compressor 14 and 16, respectively. The motor controllers 32 and 34 each accept power, send operational commands to the motors 14-1 and 16-1 of the compressors 14 and 16, and receive temperature signals from the sensors 28 and 30. Signals sent between the motor controllers 32 and 34 and the compressors 14 and 16 can all be analog.
  • the sensors 28 and 30 and the motor controllers 32 and 34 can be part of a common assembly with the compressors 14 and 16, respectively, in some embodiments.
  • the control module 18 is operatively connected to each motor controller 32 and 34, and communication between the motor controllers 32 and 34 and the control module 18 can be in the form of digital signals.
  • the control module 18 includes a data transfer interface 36 and control logic 38, which can be implemented through suitable circuitry and/or software (e.g., suitable processor(s), computer-readable memory, etc.).
  • the data transfer interface 36 facilitates communication between all of the motor controllers 32 and 34 and the control logic 38 of the control module 18.
  • the control logic 38 provides high level decision making for the VCS 10, while the motor controllers 32 and 34 handle lower-level tasks such and providing operational commands to the motors 14-1 and 16-1 of the compressors 14 and 16.
  • a refrigerant 40 (e.g., R134A refrigerant) and a lubricant 42 are present within the VCS 10.
  • portions of the refrigerant 40 and the lubricant 42 in liquid phases are present in the compressor 16.
  • Vapor phase portions of the refrigerant 40 and the lubricant 42 are also present in the vapor cycle circuit 12 and the compressors 14 and 16.
  • the VCS 10 can activate one or both of the compressors 14 and 16 to move and compress fluid (e.g., the refrigerant 40). Cooling can be provided by the VCS 10 in a conventional manner.
  • the basic operation of VCSs to provide cooling is well-known, and will be understood by those of ordinary skill in the art. Further discussion here is unnecessary.
  • both compressors 14 and 16 can be operated simultaneously to provide relatively high levels of cooling, or only one of the compressors 14 or 16 can be operated while the other compressor 14 or 16 remains idle (i.e., not moving or compressing fluid) to provide a lower level of cooling. Operation of only a single one of the compressors 14 and 16 can alternate between the two, to provide relatively even usage of each compressor 14 and 16 over time.
  • FIG. 2 is a flow chart illustrating one embodiment of a method of controlling the VCS 10.
  • the VCS 10 is operated in a mode with only one compressor 14 or 16 active to move or compress fluid (step 100).
  • the VCS 10 can also operate both compressors 14 and 16 active simultaneously, and, further, in single compressor operation the particular compressor 14 or 16 that is active can alternate.
  • a motor temperature of the motor 14-1 or 16-1 of the idle compressor 14 or 16 is sensed using the corresponding sensor 28 or 30 (step 102).
  • the temperature of fluid in the idle compressor 14 or 16 need not be sensed directly, only the temperature of motor windings of the motor 14-1 or 16-1 of the idle compressor 14 or 16.
  • Temperature of the motor windings can be sensed by delivering a current and measuring resistance through a thermistor, or using other methods as desired.
  • the sensed temperature is communicated to the control logic 38 of the control module 18.
  • the control logic 38 analyzes the sensed data and determines if the motor temperature of the idle compressor 14 or 16 is above a lower threshold (also called a lower temperature threshold) (step 104).
  • a lower threshold also called a lower temperature threshold
  • the lower threshold is approximately 48.9°C (120°F), though other temperatures can be selected for the lower threshold in alternative embodiments.
  • the lower threshold can be selected to be sufficiently high to ensure that the refrigerant 40 is vaporized.
  • a preheating mode can be activated (step 108).
  • the preheating mode can generate thermal energy by delivering power from the motor controller 32 or 34 to windings of the motor 14-1 or 16-1 of the idle compressor 14 or 16, thereby using the idle motor windings as a heater, without activating the motor 14-1 or 16-1 of the idle compressor 14 or 16 to generate a motive force to move or compress fluid.
  • Thermal energy created by motor windings can vaporize liquid, such as the refrigerant 40 and/or the lubricant 42, that may be present in the idle compressor 14 or 16, and can help drive out refrigerant 40 or other liquid from the idle compressor 14 or 16 to help prevent migration of fluid from the active compressor 14 or 16 through the vapor cycle circuit 12 that may starve the active compressor 14 or 16 of such fluid used for operation.
  • liquid such as the refrigerant 40 and/or the lubricant 42
  • the motor temperature of the idle compressor 14 or 16 it is desirable to maintain the motor temperature of the idle compressor 14 or 16 within a given range between the lower threshold and an upper threshold (also called an upper temperature threshold).
  • an upper threshold also called an upper temperature threshold.
  • the upper threshold can be approximately 54.4°C (130°F), or other temperatures in alternative embodiments. If the motor temperature is above the upper threshold, then the preheating mode of the idle compressor 14 or 16 can be turned off (step 112), and then it is okay to start the motor of the idle compressor 14 or 16 at step 106.
  • sensed motor temperature controls the preheat mode by default, and turns on or off preheating of the idle compressor 14 or 16 as a function of sensed motor temperature. If the motor temperature of the idle compressor 14 or 16 is below the upper threshold, it is determined whether the motor temperature is above the lower threshold and there is a command to turn the idle compressor 14 or 16 on (i.e., activate the idle compressor 14 or 16) (step 114). If the motor temperature is above the lower threshold and the idle compressor 14 or 16 is commanded on, then the preheat mode is turned off at step 112 and it is okay to start the motor 14-1 or 16-1 of the idle compressor 14 or 16 at step 106.
  • the preheat mode is maintained on for a preheat time period (step 116).
  • the preheat time period can be 14 minutes, or another time period in alternative embodiments.
  • the preheat mode is turned off (step 118) and thermal energy is no longer generated by the motor of the idle compressor 14 or 16.
  • the preheat time period thus provides a failsafe to limit the maximum duration of the preheating and the amount of time that heat is generated with the motor of the idle compressor 14 or 16, which helps prevent a risk of overheating in the event of a failure of the sensor 28 or 30.
  • a delay period is triggered (step 122).
  • the delay period can be 30 minutes, or other periods in alternative embodiments.
  • the preheat mode of the idle compressor 14 or 16 is maintained in an off condition. The delay period helps prevent overheating and provides further failsafe protection.
  • the preheat mode of the idle compressor 14 or 16 can be reactivated at step 116.
  • the idle compressor 14 or 16 can be started (i.e., activated) to move or compress fluid.
  • a determination can be made as to whether single compressor mode is desired (step 124). At this point, the single compressor mode using the same active compressor 14 or 16 can be maintained or the active and idle compressors 14 and 16 can alternate roles. If single compressor mode is desired, then the method can proceed to step 100 and begin again. If single compressor mode is not desired and all compressors 14 and 16 are activated, then the method is finished because preheating is not needed when all compressors 14 and 16 are active.
  • FIG. 3 is a flow chart illustrating an alternative embodiment of a method of controlling a VCS to provide a "cold start" routine.
  • a time fail-safe procedure as provided in the embodiment illustrated in FIG. 2 , is omitted. It should be appreciated that the method illustrated in FIG. 3 can readily be applied to single-compressor VCSs, or to multi-compressor systems such as VCS 10 shown in FIG. 1 .
  • a motor temperature of the motor 14-1 or 16-1 of an idle compressor 14 or 16 is sensed using a corresponding sensor 28 or 30 (step 202).
  • the temperature of fluid in the idle compressor 14 or 16 need not be sensed directly, only the temperature of the motor windings of the motor 14-1 or 16-1 of the idle compressor 14 or 16. Temperature of the motor windings can be sensed by delivering a current and measuring resistance through a thermistor, or using other methods as desired.
  • the sensed temperature is communicated to the control logic 38 of the control module 18.
  • the control logic 38 analyzes the sensed data and determines if the motor temperature of the idle compressor 14 or 16 is above a lower threshold (also called a lower temperature threshold) (step 204).
  • the lower threshold is approximately 29.4°C (85°F), though other temperatures can be selected for the lower threshold in alternative embodiments.
  • the lower threshold can be selected to be sufficiently high to ensure that the refrigerant 40 is vaporized. If the motor temperature is above the lower threshold, then it is okay to start (i.e., activate) the idle compressor motor 14-1 or 16-1 if desired (step 206). If the sensed motor temperature is below the lower threshold, then a preheating mode can be activated (step 208).
  • the preheating mode can generate thermal energy by delivering power from the motor controller 32 or 34 to windings of the motor 14-1 or 16-1 of the idle compressor 14 or 16, thereby using the idle motor windings as a heater, without activating the motor 14-1 or 16-1 of the idle compressor 14 or 16 to generate a motive force to move or compress fluid.
  • Thermal energy created by motor windings can vaporize liquid, such as the refrigerant 40 and/or the lubricant 42, that may be present in the idle compressor 14 or 16, and can help drive out refrigerant 40 or other liquid from the idle compressor 14 or 16.
  • the motor temperature of the idle compressor 14 or 16 it is desirable to maintain the motor temperature of the idle compressor 14 or 16 within a given range between the lower threshold and an upper threshold (also called an upper temperature threshold).
  • an upper threshold also called an upper temperature threshold.
  • the upper threshold can be approximately 32.2°C (90°F), or other temperatures in alternative embodiments. If the motor temperature is above the upper threshold, then the preheating mode of the idle compressor 14 or 16 can be turned off (step 212), and then it is okay to start the motor 14-1 or 16-1 of the idle compressor 14 or 16 at step 206.
  • sensed motor temperature controls the preheat mode by default, and turns on or off preheating of the idle compressor 14 or 16 as a function of sensed motor temperature. If the motor temperature of the idle compressor 14 or 16 is below the upper threshold, then it is determined if there has been a motor temperature sensor failure (step 215). This can be accomplished through built-in-testing processes, or any other suitable method. If the sensor is operating normally, preheating can continue at step 208. If the sensor has failed, preheating is turned on for a time period (e.g., 18 minutes) (step 216), then preheating is turned off (step 218). At this point it is determined if the idle compressor 14 or 16 is commanded on (step 220).
  • a time period e.g. 18 minutes
  • step 206 If the idle compressor 14 or 16 is commanded on, then it is okay to start the motor 14-1 or 16-1 at step 206. If there is no on command, then a delay period (e.g., 30 minutes) is begun (step 222). During the delay period, it is determined if there is an on command (step 224). If there is an on command any time during the delay period, then it is okay to start the motor 14-1 or 16-1 at step 206. If there is no on command after the expiration of the delay period, then a preheating period can be cycled on for a new time period (e.g., 14 minutes) (step 226), which returns to step 218 to continue the method.
  • a delay period e.g. 30 minutes
  • the idle compressor 14 or 16 can be started (i.e., activated) to move or compress fluid.
  • the method illustrated in FIG. 3 can be limited only to use in relatively cold environments or climates. For instance, use of the method shown in FIG. 3 can be used only when a sensed ambient temperature is below a suitable temperature threshold.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Air Conditioning Control Device (AREA)

Claims (13)

  1. Verfahren zum Steuern eines Dampfzyklussystems (10), das einen ersten und zweiten Kompressor (14, 16) aufweist, wobei jeder des ersten und zweiten Kompressors einen Elektromotor aufweist, wobei das Verfahren Folgendes umfasst:
    Betreiben des ersten Kompressors (14), damit er Kühlmittel komprimiert, während sich der zweite Kompressor (16) im Leerlauf befindet;
    Betreiben des zweiten Kompressors (16) durch Folgendes:
    Erfassen einer Motortemperatur des zweiten Kompressors, wenn sich der zweite Kompressor im Leerlauf befindet;
    Bestimmen, ob die Motortemperatur unterhalb einer unteren Temperaturschwelle liegt;
    Aktivieren eines Vorheizmodus, wenn die Motortemperatur unterhalb der unteren Temperaturschwelle liegt, indem dem Elektromotor Strom zugeführt wird, um Wärme zu erzeugen, während der zweite Kompressor im Leerlauf bleibt; und
    Abschalten des Vorheizmodus, wenn die erfasste Motortemperatur oberhalb einer oberen Temperaturschwelle liegt; und
    Begrenzen der maximalen Dauer des Vorheizmodus auf einen Vorheizzeitraum, sodass der Vorheizmodus abgeschaltet wird, nachdem er für den Vorheizzeitraum aktiviert war.
  2. Verfahren nach Anspruch 1 und ferner umfassend:
    Aktivieren des zweiten Kompressors, wenn die Motortemperatur oberhalb der unteren Temperaturschwelle liegt und nachdem der Vorheizmodus abgeschaltet wurde.
  3. Verfahren nach Anspruch 1 oder 2, wobei die untere Temperaturschwelle etwa 29,4 °C (85 °F) entspricht, und wobei die obere Temperaturschwelle etwa 32,2 °C (90 °F) entspricht.
  4. Verfahren nach Anspruch 1, 2 oder 3, wobei die Motortemperatur durch das Erfassen eines Widerstands mit einem Thermistor (28, 30) erfasst wird.
  5. Verfahren nach Anspruch 1, wobei der Vorheizzeitraum etwa 14 Minuten entspricht.
  6. Verfahren nach einem der vorhergehenden Ansprüche und ferner umfassend:
    Halten des zweiten Kompressorvorheizmodus in einem abgeschalteten Zustand für einen Verzögerungszeitraum; und
    Reaktivieren des Vorheizmodus für den zweiten Kompressor für den Vorheizzeitraum im Anschluss an den Verzögerungszeitraum.
  7. Verfahren nach Anspruch 6, wobei der Verzögerungszeitraum etwa 30 Minuten entspricht.
  8. Verfahren nach einem der vorhergehenden Ansprüche und ferner umfassend:
    Starten des zweiten Kompressors zum Komprimieren von Kühlmittel, nachdem der Vorheizmodus abgeschaltet wurde.
  9. Dampfzyklussystem (10), umfassend:
    einen ersten Kompressor (14), der einen Elektromotor (14-1), einen Motortemperatursensor (28) und eine Motorsteuerung (32) aufweist;
    einen zweiten Kompressor (16), der einen Elektromotor (16-1), einen Motortemperatursensor (30) und eine Motorsteuerung (34) aufweist;
    einen Kühlmittelkreislauf, wobei der erste Kompressor und der zweite Kompressor in Fluidkommunikation mit dem Kühlmittelkreislauf parallelgeschaltet sind; und
    ein Steuermodul (18), das mit der Motorsteuerung von jedem des ersten und zweiten Kompressors wirkverbunden ist, wobei das Steuermodul konfiguriert ist, um den Motorsteuerungen von jedem des ersten und zweiten Kompressors zu befehlen, lediglich einen des ersten und zweiten Kompressors zu betreiben, um Kühlmittel zu komprimieren und den anderen, im Leerlauf befindlichen des ersten und zweiten Kompressors in einem Vorheizmodus zu betreiben, wobei der Vorheizmodus aktiviert wird, um mit dem Motor des im Leerlauf befindlichen des ersten und zweiten Kompressors Wärme zu einem Vorheiztemperaturbereich zu erzeugen, und wobei das Steuermodul ferner konfiguriert ist, um eine Dauer des Vorheizmodus auf einen Vorheizzeitraum zu begrenzen.
  10. Dampfzyklussystem nach Anspruch 9, wobei der Vorheiztemperaturbereich etwa 48,9 °C (120 °F) bis etwa 54,4 °C (130 °F) entspricht.
  11. Dampfzyklussystem nach Anspruch 9 oder 10, wobei die Motortemperatursensoren von jedem des ersten und zweiten Kompressors einem Thermistor entsprechen.
  12. Dampfzyklussystem nach Anspruch 9, 10 oder 11, wobei das Steuermodul ferner konfiguriert ist, um den Vorheizmodus des im Leerlauf befindlichen des ersten und zweiten Kompressors für einen Verzögerungszeitraum in einem abgeschalteten Zustand zu halten und dann den Vorheizmodus für den im Leerlauf befindlichen des ersten und zweiten Kompressors für den Vorheizzeitraum im Anschluss an den Verzögerungszeitraum zu reaktivieren.
  13. Dampfzyklussystem nach Anspruch 12, wobei der Vorheizzeitraum etwa 14 Minuten entspricht, und wobei der Verzögerungszeitraum etwa 30 Minuten entspricht.
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US13/014,173 US20120186283A1 (en) 2011-01-26 2011-01-26 Compressor motor preheat control

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EP2482012A3 EP2482012A3 (de) 2014-07-02
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CN113623793B (zh) * 2021-08-23 2022-09-16 宁波奥克斯电气股份有限公司 一种压缩机预热控制方法、空调、计算机可读存储介质
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US20120186283A1 (en) 2012-07-26
EP2482012A3 (de) 2014-07-02
EP2482012A2 (de) 2012-08-01

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