CN108700359A

CN108700359A - Capacity modulation system for compressor for multi-compressor

Info

Publication number: CN108700359A
Application number: CN201780013453.XA
Authority: CN
Inventors: 雅各布·A·格罗舍克
Original assignee: Emerson Climate Technologies Inc
Current assignee: Copeland LP
Priority date: 2016-02-19
Filing date: 2017-02-17
Publication date: 2018-10-23
Anticipated expiration: 2037-02-17
Also published as: CN108700359B; EP3417218A1; US20170241690A1; EP3417218A4; WO2017143261A1

Abstract

A kind of system, including multiple compressors, evaporator, expansion device and system controller.Compressor in parallel can be coupled.System controller can be with:Determine saturation evaporator temperature, saturation condensation temperature and target capacity demand;Determine the power consumption of the power system capacity and assessment of the assessment for the configuration of each compressor operation;The power system capacity of assessment is compared with target capacity demand and fault tolerance value;Based on comparing and select Optimum Operation pattern based on the power consumption of assessment;And it orders the enabling of multiple compressors and deactivates to realize selected Optimum Operation pattern.Optimum Operation pattern can be selected after normal system logic realizes stable state and can be selected from a group, which has the power system capacity of the assessment in the fault tolerance of target capacity demand and minimum associated power dissipation.

Description

Capacity modulation system for compressor for multi-compressor

Cross reference to related applications

The U.S. utility patent application No.15/424 submitted this application claims on 2 3rd, 2017,352 priority, and And also require the equity of the 19 days 2 months U.S. Provisional Application No.62/297,680 submitted in 2016.The entire disclosure of above-mentioned application Content is incorporated herein by reference herein.

Technical field

This disclosure relates to capacity modulation system for compressor, and relate more particularly to optimize total system for multi-compressor The capacity modulation system for compressor for efficiency of uniting.

Background technology

The part provides the background information about the disclosure, but is not necessarily the prior art.

Compressor it is diversified industry and home applications in use so that refrigerant refrigerating plant, heat pump, HVAC, Or cycle in refrigeration system (commonly known as " refrigeration system "), desired heat and/or cool effect to provide.Above-mentioned In arbitrary system in system, compressor will provide consistent and efficient operation, to ensure that specific refrigeration system is suitably transported Row.

Compressor assembly may include the fixed multi-compressor for improving efficiency and capacity regulating to link together. Compressor has the ability being operable together or independently, to convey several discrete capacity level (capacity as needed step).Power system capacity can be by using multiple refrigerating circuits or by being adjusted using multiple compressors in single circuit. For example, frequent using in four compressor assemblies in set of roof, each compressor can be switched on and off with reality Now specific output.In other examples, such as refrigerator, two to eight compressors are the typical cases of each unit Number, it means that according to consistent or incomparable inconsistent combination, up to 12 capacity level can be obtained with by making compressor follow Ring is connected and cycle turns off to match load.

Fixed multi-compressor is activated and is closed with their connected order, to meet the capacity for the system Demand.Fixed multi-compressor can be also activated with the order of minimum run time to most run times.Compressor operating is straight Reach temperature (or other) threshold value.Based on the temperature position relative to threshold value, last compressor be switched on and off with Regulating system capacity.Current multi-compressor system, which is conceived to, to be met capacity requirement and can tend to unnecessarily recycle, warp Often ignore more efficient operation mode.

Invention content

This part provides the overview of the disclosure, rather than the comprehensive disclosure of its full scope or its whole feature.

Example system includes multiple compressors, evaporator, condenser and system controller.Multiple compressors can be by altogether Same discharge pipe line and common suction line parallel connection are coupled.System controller can determine the saturation evaporator temperature of evaporator Degree, the saturation condensation temperature of condenser and the target capacity demand for multiple compressors.System controller can be based on full The power system capacity of the assessment of each operative configuration for multiple compressors is determined with evaporator temperature and saturation condensation temperature With the power consumption of assessment.System controller can will be needed for the power system capacity of the assessment of each operative configuration and target capacity Summation fault tolerance value is compared.System controller can be based on comparing and based on the assessment for each operative configuration Power consumption selects the Optimum Operation pattern of multiple compressors.Optimum Operation pattern can be selected from the power system capacity of one group of assessment Operative configuration in the fault tolerance of target capacity demand, and Optimum Operation pattern has in the group minimum associated Power dissipation.System controller can order the enabling of multiple compressors and deactivate to realize selected Optimum Operation mould Formula.

Compressor assembly can also include multiple compressors, multiple compressors have at least one fixed-capacity compressor and At least one double-stage compressor.

Compressor assembly can also include at least one double-stage compressor, and at least one double-stage compressor includes having delay The compressor of intake system.

Compressor assembly can also include at least one double-stage compressor, and at least one double-stage compressor includes having speed change The compressor of motor.

Compressor assembly can also include multiple compressors, and there is multiple compressors variable volume to compare compressor.

Compressor assembly can also include at least one double-stage compressor, and at least one double-stage compressor includes with another The compressor of Capacity Adjustment Scheme or scrollwork piece-rate system.

Compressor assembly can also include the power system capacity of assessment, and the power system capacity of the assessment is based in multiple compressors The feature of each compressor calculate.

Compressor assembly can also include the operative configuration for multiple compressors, and operative configuration has in multiple compressors Each compressor position and coefficient performance curve for each compressor in multiple compressors.

Compressor assembly can also include system controller, and the system controller is based in associated operative configuration Ten coefficient performance curves of each compressor in multiple compressors determine that the power of the assessment for each operative configuration disappears Consumption.

Compressor assembly can also include system controller, and the system controller is based in associated operative configuration Ten coefficient performance curves of each compressor in multiple compressors hold come the system for determining the assessment for each operative configuration Amount.

Compressor assembly can also include system controller, which judges before selecting Optimum Operation pattern Whether multiple compressors are stable.About multiple compressors whether be stabilized judgement can be based on current sensor, altogether With suction line temperature sensor, common discharge pipe line temperature sensor, common suction line pressure sensor and The output valve of at least one of common discharge pipe line pressure sensor.

Compressor assembly can also include multiple compressors, and multiple compressors include a double-stage compressor and have different Two fixed-capacity compressors of capacity, and multiple compressors have 11 associated operative configurations.

Compressor assembly can also include multiple compressors, and multiple compressors include two fixed-capacity compressors and one Double-stage compressor, two fixed-capacity compressors and a double-stage compressor have different capacity, and multiple compression equipments There are seven associated operative configurations.

Example system includes the first circuit, second servo loop and system controller.First circuit has common by first Multiple first compressors that discharge pipe line and the first common suction line parallel connection are coupled.Second servo loop has through the second common row Put multiple second compressors of pipeline and the second common suction line parallel connection connection.System controller is based on saturation evaporator temperature Each behaviour for multiple compressors in the multiple compressors and second servo loop in the first circuit is determined with saturation condensation temperature Make the power consumption of the power system capacity and assessment of the assessment configured.System controller is based on the assessment for each operative configuration The comparison of power system capacity and target capacity demand and fault tolerance value and based on the power of the assessment for each operative configuration It consumes and the Optimum Operation pattern of multiple compressors in the multiple compressors and second servo loop in the first circuit is selected. Optimum Operation pattern is selected from operative configuration of the power system capacity in the fault tolerance of target capacity demand of one group of assessment and most Excellent operation mode has minimum associated power dissipation in this set.System Controller commands in the first loop more The enabling of multiple compressors in a compressor and second servo loop and deactivate, to realize selected Optimum Operation pattern.It should Understand, system is not limited to two circuits, and can control and optimize the compressor operation mould in the circuit of any number Formula.

Exemplary method for operating system can include determining that the saturation of the saturation evaporator temperature of evaporator, condenser Condensation temperature and target capacity demand for multiple compressors;Based on saturation evaporator temperature and saturation condensation temperature come really Surely it is used for the power consumption of the power system capacity and assessment of the assessment of each operative configuration of multiple compressors;It will be used for each operation The power system capacity of the assessment of configuration is compared with target capacity demand and fault tolerance value;Based on comparing and based on for every The power consumption of the assessment of a operative configuration selects the Optimum Operation pattern of multiple compressors, Optimum Operation pattern to be commented selected from one group Operative configuration of the power system capacity estimated in the fault tolerance of target capacity demand, and Optimum Operation pattern has in the group Minimum associated power dissipation;And it orders the enabling of multiple compressors and deactivates to realize selected Optimum Operation mould Formula.

This method further includes:Multiple compressors include fixed-capacity compressor, double-stage compressor and variable volume than pressure At least one of contracting machine, wherein if multiple compressors include double-stage compressor, which includes that there is delay to inhale Enter the compressor, the compressor with variable speed driver and at least one of the compressor with scrollwork piece-rate system of system.

This method can also include calculating the power system capacity of assessment based on the operative configuration for multiple compressors.

This method can also include:Operative configuration for multiple compressors has each compressor in multiple compressors Position and ten coefficient performance curves for each compressor in multiple compressors.

This method can also include:Based on for each compression in multiple compressors in associated operative configuration Ten coefficient performance curves of machine determine the power consumption of the assessment for each operative configuration.

This method can also include:Based on for each compression in multiple compressors in associated operative configuration Ten coefficient performance curves of machine determine the power system capacity of the assessment for each operative configuration.

This method can also include:Judge whether multiple compressors are stable before selecting Optimum Operation pattern, closes Judgement whether has been stabilized based on current sensor, common suction line temperature sensor, common in multiple compressors In discharge pipe line temperature sensor, common suction line pressure sensor and common discharge pipe line pressure sensor at least The output valve of one.

According to description provided herein, other application field will be apparent.Description in the content of present invention and specifically show The purpose that example is only intended to illustrate, and be not intended to limit the scope of the present disclosure.

Description of the drawings

Attached drawing described herein is merely to illustrate selected embodiment rather than whole possible realization methods, and And it is not intended to limit the scope of the present disclosure.

Fig. 1 is the schematic diagram according to the compressor assembly of the disclosure;

Fig. 2 is the stereogram of the multi-compressor of the compressor assembly of Fig. 1;

Fig. 3 is the chart for illustrating multiple operation modes for various compressor assemblies;

Fig. 4 is the table for illustrating the possible operation mode for incomparable inconsistent three-member type compressor assembly;

Fig. 5 is the schematic diagram of the control system of the compressor assembly for Fig. 1;

Fig. 6 is the example pressure temperature map for compressor;

Fig. 7 is flow chart the step of illustrating the compressor assembly for operation diagram 1;And

Fig. 8 be illustrate the fixation pressure of optimization than with conventional fixation pressure than the effect with vario valve than compressor assembly The curve graph that rate influences.

In several views of all attached drawings, corresponding reference numeral indicates corresponding parts.

Specific implementation mode

Example embodiment is described more fully now with reference to attached drawing.

Referring to Fig.1, a kind of capacity modulation system for compressor 10 is provided.Capacity modulation system for compressor 10 can at least It is combined including multi-joint or Heating,Ventilating and Air Conditioning (HVAC) systems for connecting compressor 14, condenser 18 and evaporator 22 or refrigeration system 12 more It uses.Although refrigeration system 12 is described and illustrated as including multi-joint compressor 14, condenser 18 and evaporator 22, refrigeration system System 12 may include additional and/or replacement component (only as an example, expansion valve).In addition, the disclosure is suitable for various types of The refrigeration system of type, these refrigeration systems include but not limited to Heating,Ventilating and Air Conditioning (HVAC) system, heat pump system, refrigeration system and cold Jelly machine system.

During the operation of refrigeration system 12, multi-joint compressor 14 make refrigerant substantially condenser 18 and evaporator 22 it Between cycle desired heat and/or cool effect to generate.Specifically, multi-joint compressor 14 receives the refrigerant of vaporous form simultaneously Compress refrigerant.The pressurized refrigerant agent of vaporous form is supplied to condenser 18 by multi-joint compressor 14.

All or part of pressurized refrigerant agent of the pressurized refrigerant agent received from multi-joint compressor 14 can be in condenser 18 It is transformed into liquid.Specifically, the heat from refrigerant is transferred to surrounding air by condenser 18, to cooling refrigerant.Work as system When refrigerant vapor is cooled to the temperature less than saturation temperature, the state of refrigerant becomes liquid from steam.Condenser 18 can wrap Condenser fan (not shown) is included, the condenser fan is by forcing air across heat exchanger disk associated with condenser 18 Pipe is communicated off the rate of refrigerant to increase heat.

Refrigerant can pass through the expansion valve (not shown) for making refrigerant expand before reaching evaporator 22.Evaporator 22 It can receive and come the vaporous cryogen of condenser 18 and the mixture of liquid refrigerant or neat liquid refrigerant.Refrigerant is inhaled Receive the heat in evaporator 22.Therefore, when being warming up to the temperature more than or equal to the saturation temperature of refrigerant, it is arranged in evaporator The state of liquid refrigerant in 22 becomes steam from liquid.Evaporator 22 may include evaporator fan (not shown), the steaming Hair device fan is transferred to refrigerant by forcing air across heat exchanger coil associated with evaporator 22 to increase heat Rate.

When liquid refrigerant absorbs heat, the surrounding air arranged close to evaporator 22 is cooled.Evaporator 22 can be set Set in space to be cooled --- such as building or refrigerating box --- it is interior, within this space, by absorb heat refrigerant generate Cooling effect for cooling down the space.Evaporator 22 can also be associated with heat pump refrigeration system, wherein evaporator 22 can be with Building is located remotely from so that cooling effect scatters and disappears in an atmosphere, and the discharge heat generated by condenser 18 is directed to The inside in space to be heated.

Referring additionally to Fig. 2, multi-joint compressor 14 may further include connection in parallel two or more compressors 26, 30,34.Each compressor in each compressor 26,30,34 of multi-joint compressor 14 includes that can be activated to control pressure The multiple solenoids 36 and contactor 38 of contracting machine.Only as an example, under applicable circumstances, solenoid 36 and contact can be enabled Device 38 so that compressor with full capacity or load or portion capacity or load running.Only as an example, being shown in Fig. 1 and Fig. 2 Three compressors 26,30,34.Although three compressors have shown and described it should be appreciated that in multi-joint compressor May include any number of compressor in 14, any number of compressor includes two compressors and more than three compressions Machine.Compressor 26,30,34 shares single suction header or common suction line 40 and single discharge manifold or common row Put pipeline 42.

Although discussing and showing the single circuit of multi-joint compressor it should be appreciated that can in individual system With there are multiloops.Each circuit in system includes being coupled with two pieces, three, four or any other quantity for its own Multi-joint compressor.Circuit in multiloop system is independent, but can pass through common evaporator and common condenser Operation.By being individually turned on each circuit or output can be adjusted with other loop combinations.Therefore, the present disclosure is not limited to The single circuit of multi-joint compressor, but can be applied to any amount of multiloop, wherein each circuit all has multi-joint pressure Contracting machine.

Multi-joint compressor 14 may include one or more multi-stage compressions that can be operated with multiple and different capacity levels Machine.It is, for example, possible to use (can have relatively low with full capacity or load (or the volumetric ratio that is vortexed entirely) and pondage or load Vortex volumetric ratio) operation double-stage compressor.Compound compressor can make capacity regulating in any way, including but unlimited It is adjusted in two-step capacity regulating or continuous volume.Two-step capacity regulating be compressor according to cooling and/or demand for heat and The case where with full capacity or load (for example, 100% capacity) or portion capacity or load (for example, 67% capacity) operation.Example Such as, two-step capacity regulating can be utilized such as United States Patent (USP) No.6, described in 821,092 by making intermediary press room to suction Enter chamber venting and realized to adjust the delay intake system of compressor capacity, which is incorporated to by reference Herein.It is adjusted by continuous volume or variable valve regulation, the capacity of compressor can be adjusted to 100% from 10% so that is defeated Go out the cooling of the variation of accurate package space to require.For example, by-passing valve and bypass passageways can be used for continuously adjusting compressor Capacity, without changing the speed of motor.For another example the speed change capacity regulating system for the speed for changing compressor motor can be utilized It unites to realize that continuous volume is adjusted.Compressor motor speed determines the rate of refrigerant stream;It therefore, can be by changing motor frequency Rate carrys out pondage.Therefore, for speed change capacity modulation, volume output increases and reduces with motor speed.For another example It can realize that continuous volume is adjusted using cyclonic separation capacity modulation.In cyclonic separation capacity modulation, pass through Swirling device is set to be axially separated within compared with minor time slice to realize volume controlled.For example, in United States Patent (USP) No.6,213,731 In describe a kind of cyclonic separation capacity modulation, which is incorporated herein by reference.In addition, any continuous appearance Amount regulating system can also be operated with two discrete capacity steps to realize two-step capacity regulating.Double-stage compressor Different operations or power mode there are three types of having due to its capacity regulating:Shutdown, full capacity or load, and adjust or reduce Capacity or load.

Multi-joint compressor 14 may include fixed-capacity compressor.Fixed-capacity compressor is that have in single standard Set the compressor of the conventional vortex design of volumetric ratio (BIVR).Fixed-capacity compressor has two different operations or power mould Formula:Shutdown and full capacity or load.

Multi-joint compressor 14 may include that variable volume compares compressor.Variable volume includes bypass passageways with logical than compressor It crosses compression fluid being introduced into via by-passing valve and eliminates overcompression loss in the determine vortex part of compressor.Variable volume compares compressor There are three types of different operations or power modes for tool:It turns off, full BIVR and capacity, and the vortex volumetric ratio reduced.Variable volume Can be passive scheme or any other scheme than compressor.Although variable volume can be passive in control aspect than compressor Scheme, but variable volume carrys out meet demand by adjusting vortex volumetric ratio than compressor and increases additional complexity. In multi-joint compressor, which compressor is understood with variable volume than designing and selectivelying switch on and turn off these compressor meetings Influence overall system efficiency (referring to Fig. 8, being discussed in further detail below).With with optimization fixation pressure ratio or routine consolidate Constant-pressure than compressor compare, variable volume can provide higher effect than compressor within the scope of larger system pressure Rate.As shown in figure 8, pressure ratio is calculated as discharge pressure divided by suction pressure.

Multi-joint compressor 14 can be consistent the compressor that multi-compressor or incomparable inconsistent Multi-compressor parallel are coupled.One The multi-compressor of cause is the parallel connection compressor of BIVR and capacity having the same;And incomparable inconsistent multi-compressor have it is different The parallel connection compressor of BIVR and/or capacity.Multi-joint compressor 14 can also include double-stage compressor, fixed-capacity compressor and can Capacity is than one or more of types in compressor.

Referring now to Fig. 3, in some embodiments, multi-joint compressor 14 can be consistent two-piece type fixed capacity pressure Contracting machine, it means that multi-joint compressor 14 may include two fixed capacities of the having the same BIVR and capacity in parallel being coupled Compressor.Since two kinds of operation modes of each fixed-capacity compressor in two fixed-capacity compressors and two are consolidated Constant volume capacity compressor BIVR having the same and the fact that capacity, thus consistent two-piece type fixed-capacity compressor removes all pressures Also there is two kinds of possible operations or power mode in total, i.e. both operations or power other than the operation mode that contracting machine is turned off Pattern is:(1) compressor is connected;And (2) two compressors are connected.

In other embodiments, multi-joint compressor 14 can be consistent three-member type fixed-capacity compressor, this meaning Three fixed-capacity compressors that multi-joint compressor 14 may include the having the same BIVR and capacity in parallel being coupled.Due to The two kinds of operation modes and three fixed-capacity compressors of each fixed-capacity compressor in three fixed-capacity compressors The fact that BIVR and capacity having the same, thus consistent three-member type fixed-capacity compressor is turned off in addition to all compressors Operation mode except also there is three kinds of possible operations or power mode in total, i.e. these three operations or power mode to be:(1) One compressor is connected;(2) two compressors are connected;And (3) three compressors are connected.

In other embodiments, multi-joint compressor 14 can be incomparable inconsistent two-piece type fixed-capacity compressor, this meaning It may include two fixed-capacity compressors with different BIVR and capacity in parallel being coupled that taste, which multi-joint compressor 14,.By Two kinds of operation modes of each fixed-capacity compressor in two fixed-capacity compressors and two fixed capacity compressions Machine have different BIVR and capacity the fact, thus incomparable inconsistent two-piece type fixed-capacity compressor in addition to all compressors all Also there is three kinds of possible operations or power mode in total, i.e. these three operations or power mode except the operation mode of shutdown For:(1) relatively low capacity compressor is connected;(2) higher capacity compressor is connected;And (3) two compressors are turned on.

In other embodiments, multi-joint compressor 14 can be incomparable inconsistent three-member type fixed-capacity compressor, this meaning It may include three fixed-capacity compressors with different BIVR and capacity in parallel being coupled that taste, which multi-joint compressor 14,.By Two kinds of operation modes of each fixed-capacity compressor in three fixed-capacity compressors and three fixed capacity compressions Machine has the fact that different BIVR and capacity, thus incomparable inconsistent three-member type fixed-capacity compressor is all closed except all compressors Also with seven kinds of possible operations or power mode in total except disconnected operation mode, i.e., this seven kinds operations or power mode are: (1) lowest capacity compressor is connected;(2) intermediate size compressor is connected;(3) peak capacity compressor is connected;(4) lowest capacity Compressor is connected with intermediate size compressor;(5) lowest capacity compressor is connected with peak capacity compressor;And (6) are medium Capacity compressor is connected with peak capacity compressor;(7) all three compressors are turned on.

In other embodiments, multi-joint compressor 14 can be consistent two-piece type double-stage compressor, it means that more It may include a double-stage compressor and a fixed-capacity compressor to join compressor 14, wherein two compressions that parallel connection is coupled Machine BIVR having the same and capacity.Due to three kinds of operation modes of double-stage compressor and two kinds of operations of fixed-capacity compressor Pattern and double-stage compressor and the fact that fixed-capacity compressor BIVR having the same and capacity, thus consistent two pieces Formula double-stage compressor also has four kinds of possible operations or power mould in total in addition to the operation mode that all compressors are turned off Formula, i.e. these four operations or power mode are:(1) fixed-capacity compressor connects (or double-stage compressor is connected with high power capacity); (2) double-stage compressor is connected with low capacity;(3) fixed-capacity compressor is connected and double-stage compressor is connected with low capacity;With And (4) fixed-capacity compressor is connected and double-stage compressor is connected with high power capacity.

In other embodiments, multi-joint compressor 14 can be consistent three-member type double-stage compressor, it means that more Connection compressor 14 may include a double-stage compressor and two fixed appearances of the having the same BIVR and capacity in parallel being coupled Capacity compressor.Due to each fixed-capacity compressor in three kinds of operation modes and fixed-capacity compressor of double-stage compressor Two kinds of operation modes and double-stage compressor and the fact that fixed-capacity compressor BIVR having the same and capacity, thus one The three-member type double-stage compressor of cause also has six kinds of possible operations in total in addition to the operation mode that all compressors are turned off Or power mode, i.e., this six kinds operations or power mode are:(1) any fixed-capacity compressor connect (or double-stage compressor with High power capacity is connected);(2) double-stage compressor is connected with low capacity;(3) fixed-capacity compressors are connected and double-stage compressor It is connected with low capacity;(4) two fixed-capacity compressors connect that (or a fixed-capacity compressor is connected and double-stage compressor It is connected with high power capacity);(5) two fixed-capacity compressors are connected and double-stage compressor is connected with low capacity;And (6) two Fixed-capacity compressor is connected and double-stage compressor is connected with high power capacity.

In other embodiments, multi-joint compressor 14 can be incomparable inconsistent two-piece type double-stage compressor, it means that Multi-joint compressor 14 may include the in parallel double-stage compressor with different BIVR and capacity being coupled and a fixation Capacity compressor.Due to three kinds of operation modes of double-stage compressor and two kinds of operation modes, Yi Jishuan of fixed-capacity compressor Grade compressor and fixed-capacity compressor have the fact that different BIVR and capacity, thus incomparable inconsistent two-piece type Two-stage Compression Machine also has five kinds of possible operations or power mode in total, this five kinds behaviour in addition to the operation mode that all compressors are turned off Make or power mode is:(1) double-stage compressor is connected with low capacity;(2) fixed-capacity compressor is connected;(3) double-stage compressor It is connected with high power capacity;(4) fixed-capacity compressor is connected and double-stage compressor is connected with low capacity;And (5) fixed capacity Compressor is connected and double-stage compressor is connected with high power capacity.

In other embodiments, multi-joint compressor 14 can be incomparable inconsistent three-member type double-stage compressor, it means that Multi-joint compressor 14 may include that the in parallel double-stage compressor with different BIVR and capacity being coupled and two consolidate Constant volume capacity compressor.Due to each fixed capacity compression in three kinds of operation modes and fixed-capacity compressor of double-stage compressor The two kinds of operation modes and double-stage compressor and fixed capacity technique compresses machine of machine have the thing of different BIVR and capacity It is real, thus incomparable inconsistent three-member type double-stage compressor also has in total 11 in addition to the operation mode that all compressors are turned off Kind possible operation or power mode, a kind of this ten operation or power mode are:(1) it is connected compared with low capacity fixing compressor;(2) Higher capacity fixing compressor is connected;(3) double-stage compressor is connected with low capacity;(4) double-stage compressor is connected with high power capacity; (5) it is connected compared with low capacity fixing compressor and higher capacity fixing compressor is connected;(6) it is connected compared with low capacity fixing compressor And double-stage compressor is connected with low capacity;(7) it is connected compared with low capacity fixing compressor and double-stage compressor is connect with high power capacity It is logical;(8) higher capacity fixing compressor is connected and double-stage compressor is connected with low capacity;(9) higher capacity fixing compressor It connects and double-stage compressor is connected with high power capacity;(10) it is connected compared with low capacity fixing compressor, higher capacity fixing compressor It connects, and double-stage compressor is connected with low capacity;And (11) are connected compared with low capacity fixing compressor, higher capacity fixes pressure Contracting machine is connected, and double-stage compressor is connected with high power capacity.

In other embodiments, multi-joint compressor 14 can include connection in parallel with different BIVR and capacity Three double-stage compressors the incomparable inconsistent double-stage compressor of three-member type.Due to each Two-stage Compression in three double-stage compressors The three kinds of operation modes and double-stage compressor of machine have the fact that different BIVR and capacity, thus three-member type Two-stage Compression Machine in addition to the operation mode that all compressors are turned off also in total with 26 kinds of possible operations or power mode, This 26 kinds operations or power mode are:(1) it is connected with high power capacity compared with low capacity double-stage compressor;(2) compared with low capacity twin-stage Compressor is connected with low capacity;(3) intermediate size double-stage compressor is connected with high power capacity;(4) intermediate size double-stage compressor with Low capacity is connected;(5) higher capacity double-stage compressor is connected with high power capacity;(6) higher capacity double-stage compressor is connect with low capacity It is logical;(7) it is connected with high power capacity with intermediate size double-stage compressor compared with low capacity double-stage compressor;(8) compared with low capacity Two-stage Compression Machine is connected with intermediate size double-stage compressor with low capacity;(9) compared with low capacity double-stage compressor with high power capacity connect and it is medium Capacity double-stage compressor is connected with low capacity;(10) compared with low capacity double-stage compressor with low capacity connection and intermediate size twin-stage Compressor is connected with high power capacity;(11) it is connected with high power capacity with higher capacity double-stage compressor compared with low capacity double-stage compressor; (12) it is connected with low capacity with higher capacity double-stage compressor compared with low capacity double-stage compressor;(13) compared with low capacity double-stage compressor It is connected with high power capacity and high power capacity double-stage compressor is connected with low capacity;(14) it is connect with low capacity compared with low capacity double-stage compressor Logical and high power capacity double-stage compressor is connected with high power capacity;(15) intermediate size double-stage compressor and higher capacity compressor are with height Capacity is connected;(16) intermediate size double-stage compressor is connected with higher capacity double-stage compressor with low capacity;(17) intermediate size Double-stage compressor is connected with high power capacity and high power capacity double-stage compressor is connected with low capacity;(18) intermediate size double-stage compressor It is connected with low capacity and high power capacity double-stage compressor is connected with high power capacity;(19) compared with low capacity double-stage compressor, intermediate size Double-stage compressor is connected with higher capacity double-stage compressor with high power capacity;(20) double compared with low capacity double-stage compressor, intermediate size Grade compressor is connected with high power capacity double-stage compressor with low capacity;(21) compared with low capacity double-stage compressor and intermediate size twin-stage pressure Contracting machine is connected with high power capacity and is connected with low capacity compared with high power capacity double-stage compressor;(22) compared with low capacity double-stage compressor and Higher capacity double-stage compressor is connected with high power capacity and intermediate size double-stage compressor is connected with low capacity;(23) intermediate size Double-stage compressor is connected with high power capacity with higher capacity double-stage compressor and is connected with low capacity compared with low capacity double-stage compressor; (24) it is connected with low capacity with intermediate size double-stage compressor compared with low capacity double-stage compressor and higher capacity double-stage compressor It is connected with high power capacity;(25) it is connected with low capacity with higher capacity double-stage compressor compared with low capacity double-stage compressor and medium appearance Amount double-stage compressor is connected with high power capacity;And (26) intermediate size double-stage compressor and higher capacity double-stage compressor are with low appearance Amount is connected and is connected with high power capacity compared with low capacity double-stage compressor.

Referring now to Fig. 4, the number and compressor of the possible operation mode based on each compressor in compressor Whether total possible operation mode is determined with identical or different BIVR and capacity.For example, shown in Fig. 4 incomparable inconsistent Three-member type double-stage compressor has a double-stage compressor in parallel being coupled (for example, capacity is the twin-stage pressure of 83,000BTU/hr Contracting machine) and with different BIVR and capacity two fixed-capacity compressors (for example, with 76,000BTU/hr capacity Fixed-capacity compressor and fixed-capacity compressor with 91,000BTU/hr capacity).By this combination of compressor, always A kind of ten possible operation modes are shared, as shown in 11 rows in Fig. 4.Each possible operation mode is indicated in Fig. 4.With reference to Symbol table (Key), double-stage compressor may be at shutdown (0), full BIVR and capacity or load (1) or relatively low or adjusting Capacity or load (- 1).Each fixed-capacity compressor in fixed-capacity compressor may be at shutdown (0) or full BIVR With capacity or load (1).Therefore, the various combination of compressor ON/OFF/shaping modes is combined to form except all compressors Ten a kind of possible operation mode in total except the operation mode being turned off.

Although be discussed above the consistent three-member type compressor of the consistent two-piece type compressor of fixed capacity, fixed capacity, The consistent two-piece type pressure of the incomparable inconsistent two-piece type compressor of fixed capacity, the incomparable inconsistent three-member type compressor of fixed capacity, twin-stage The consistent three-member type compressor of contracting machine, twin-stage, the incomparable inconsistent two-piece type compressor of twin-stage and the incomparable inconsistent three-member type pressure of twin-stage Contracting machine, but it is understood that, double-stage compressor, compound compressor, fixed-capacity compressor and vario valve compressor are appointed What combination can parallel combination and be used for multi-joint compressor 14.The total number base of the possible operation mode of multi-joint compressor 14 It is identical or different complete whether the number and compressor of the possible operation mode of each compressor in compressor have BIVR and capacity determine.

Referring to Fig.1, Fig. 2 and Fig. 5, system controller 46 can be with capacity modulation system for compressor 10 and/or multi-joint compressions Machine 14 is associated, and can order each compressor start in multi-joint compressor 14 and/or refrigeration system 12, stabilization, Shutdown, capacity increase and capacity reduces.System controller 46 can determine compressor 14 and/or system using a series of sensors The operating parameter of the measurement of cooling system 12 and non-measured both operating parameters.Although system controller 46 be shown as with it is multi-joint Compressor 14 is associated, but system controller 46 can be located at any position in refrigeration system 12 or outside refrigeration system 12. System controller 46 can be combined using non-measured operating parameter with the operating parameter of measurement to indicate multi-joint compressor 14 And/or startup, stabilization, shutdown, capacity increase and the capacity of each compressor in refrigeration system 12 reduce.

System controller 46 can receive common discharge pipe line temperature with the compressor in the multi-joint compressor of determination 14 Stablize, as described further below.System controller 46 can also be communicated with various sensors with the multi-joint compressor of determination Stablize.For example, stabilization can be by measuring the current sensor 50 of the motor current of each compressor in multi-joint compressor 14 To determine.Stabilization can also be determined by suction line temperature.Suction line temperature sensor 54 can be in suction line It is arranged into multi-joint compressor 14.Common discharge pipe line temperature can be by discharge pipe line temperature sensor 58 from leaving multi-joint pressure The discharge pipe line of contracting machine 14 directly senses, and system controller can search stablize progress discharge pipe line temperature signal and/ Or the signal derivative value to go to zero.Similarly, when the output by current sensor 50 or suction line temperature sensor 54 is true When the stabilization of fixed multi-joint compressor, system controller 46, which will be searched, stablizes the signal carried out and/or the signal derivative value to go to zero.

System controller 46 can also receive the operating condition of compressor, for example be saturated evaporator temperature (Ts) and be saturated cold Solidifying temperature (Tc).Can directly it feel from the temperature sensor 66 in the temperature sensor 62 and condenser 18 in evaporator 22 respectively Survey saturation evaporator temperature and saturation condensation temperature.It is saturated evaporator temperature and saturation condensation temperature can also be respectively by by steaming The pressure that the pressure sensor 70 at device 22 and the pressure sensor 74 at condenser 18 sense is sent out to determine.By pressure sensor The condensing pressure of 74 sensings is the pressure that refrigerant becomes liquid from vapor phase.The evaporating pressure sensed by pressure sensor 70 is Refrigerant from liquid phase-change be steam pressure.

Only as an example, saturation evaporator temperature can be directly related with saturation evaporator pressure, and it is saturated condensation temperature Degree can be directly related with saturation condensing pressure.Fig. 6 provides for various refrigerant types that pressure is related to temperature The example chart of connection.Therefore, system controller 46 can be by searching in the memory 78 being stored in system controller 46 Sensing value in table is saturated evaporator temperature and saturation condensation temperature to determine.

System controller 46 can also be that each compressor in multi-joint compressor 14 stores ten coefficients in memory 78 Performance model.Ten coefficient performance models are determined by manufacturer or setter, and ten coefficient performance models describe the behaviour of compressor Make characteristic.Ten coefficient performance models can be input in installation or inspection period or when manufacturing completion by user interface 82 In memory 78.Ten coefficient performance models are compressor model and size specifically and are announced by compressor Manufacturing business.Compression Machine capacity can pass through ARI (air-conditioning and refrigeration research institute (Air-Conditioning and Refrigeration Institute air-conditioning), now, for warm refrigeration research institute (Air-Conditioning, Heating,; Refrigeration Institute)) ten coefficient performance curve formula calculate:

X=C0+ (C1*S)+(C2*D)+(C3*S²)+(C4*S*D)+(C5*D²)+(C6*S³)+(C7*D*S²)+(C8*S* D²)+(C9*D³)

Wherein, X is capacity (BTU/HR) or power (watt or ampere), and S is saturation evaporating temperature, and D is saturation condensation temperature Degree.

Although discussing ten coefficient performance models it should be appreciated that different coefficients can be applied to characterize.Example Such as, compressor can be modeled based on 20 coefficient systems.The present disclosure is not limited to ten coefficient performance models, but can be real What incumbent compressor characterization scheme, such as ten coefficient schemes, 20 coefficient schemes or any other number of coefficients scheme.

The position of each compressor in multi-joint compressor 14 or configuration also are stored in memory 78.For example, in addition joining According to Fig. 1, Fig. 2 and Fig. 4, if multi-joint compressor 14 presses double-stage compressor, fixed-capacity compressor 1 and fixed-capacity compressor 2 Be ranked sequentially, then double-stage compressor can be assigned location A, and fixed-capacity compressor 1 can be assigned B location, and solid Constant volume capacity compressor 2 can be assigned location of C.Therefore, memory 78 stores the mark of each compressor in multi-joint compressor 14 Knowledge and position or configuration.

The input of 46 receiving sensor data of system controller calculates common discharge pipe line according to sensing data It is every in temperature, saturation evaporator temperature, saturation condensation temperature, ten coefficient performance models or curve and multi-joint compressor 14 The mark of a compressor and position.According to the data, system controller 46 order the startup of multi-joint compressor 14, stabilization, shutdown, Capacity increases and capacity reduces.

System controller 46 may include the processing electricity of the function for executing the method 100 for adjusting compressor capacity Road device 86.Referring now to Fig. 5 and Fig. 7, system controller 46 receive at step 104 to goal systems capacity (or capacity need Ask) request.For example, can be based on the Current Temperatures in air-conditioning or refrigerating space and the target temperature in air-conditioning or refrigerating space Comparison be calculated or determined goal systems capacity.Freeze with target for another example current refrigerant temperature or pressure can be based on Agent temperature or pressure are compared to that goal systems capacity is calculated or determined.In step 108, processing circuit unit 86 can be with base Carry out in capacity requirement or to the request of goal systems capacity one in the compressor 26,30,34 in the multi-joint compressor of order 14 Or more compressor startup.In step 112, once compressor operating in multi-joint compressor 14, then processing circuit fill The stable state of compressor 26,30,34 of the enabling in multi-joint compressor 14 can be waited for and determine by setting 86.

Stabilization/starting state after defined start-up course, this make compressor 26 in multi-joint compressor 14, 30, each compressor in 34 once connects one to limit inrush current (inrush current).For example, maximum capacity Single compressor can be initiated first.Remaining compressor can be activated with the order of maximum capacity to minimum capacity until mesh Until mark system capacity is satisfied.Stabilization/starting state of multi-joint compressor 14 passes through the first life from system controller 46 Signal is enabled to start, and terminate with the steady state operation of the compressor being activated in multi-joint compressor 14.Stablize State operation is by monitoring discharge pipe line temperature derivative value at any time and derivative value being waited for be connect during the period of setting Nearly low value or threshold value determine.Only for example, being less than discharge pipe line temperature at two points in derivative value (change of discharge pipe line temperature) In the time of clock in the case of three degrees Fahrenheits (°F), stablizes or plateau can be determined.Therefore, targets threshold can be three Degrees Fahrenheit (°F).It should be understood, however, that targets threshold can change with each different system or application type. Some systems are faster more stable than other systems.For example, if system uses electric expansion valve rather than the thermal expansion valve of routine (TXV), electronic expansion valve system will be faster more stable than the conventional system with TXV.Therefore, although provide three degrees Fahrenheits (° F example), but different targets thresholds may be used to determine stabilization or plateau for different system and application type Operation.

As described above, system controller 46 can be determined by monitoring common discharge pipe line temperature in multi-joint compression The stabilization of compressor 26,30,34 in machine 14.System controller 46 can be communicated with discharge pipe line temperature sensor 58 to receive Common discharge pipe line temperature.Alternatively, stabilization can be according to the output of the signal of current sensor 50 or suction line temperature The signal of sensor 54 exports to determine.System controller 46 can determine:When discharge pipe line temperature, come from current sensor 50 Signal or the signal of suction line temperature sensor 54 become stable and/or temperature or the derivative value of current signal become zero When, multi-joint compressor 14 is stable.

Processing circuit unit 86 communicates with memory 78 and can receive ten coefficient performance models and more from memory 78 Join mark and the position of each compressor 26,30,34 in compressor 14.At step 116, according to input, processing circuit dress Set 86 can based on current saturation evaporator temperature, saturation condensation temperature and in multi-joint compressor 14 when previous group is opened The applicable ten coefficients performance model of compressor determines the current of the compressor being activated in multi-joint compressor 14 The power system capacity (ESC) of assessment.Assessment system capacity can with from step 104 target capacity or capacity requirement is identical or phase Closely.Only for example, the power system capacity or target capacity of assessment can be imitated according to ten coefficient performance models and previously described compressor Rate formula determines.

Processing circuit unit 86 can be received from each sensor common discharge line temperature, saturation evaporator temperature and It is saturated condensation temperature, or common discharge pipeline temperature can be calculated according to the foregoing sensing data that other are received Degree, saturation evaporator temperature and saturation condensation temperature.At step 120, processing circuit unit 86 then can be according to various The compressor capacity of assessment that inputs to determine all applicable operation modes for multi-joint compressor 14 and associated The power dissipation of assessment.Only for example, compressor capacity can use ten systems for assessing compressor capacity and power consumption Performance model is counted to calculate.As above with reference to described in Fig. 3, each independent operation mode includes the group of the compressor enabled It closes, the compressor of enabling includes particularly to operate the arbitrary double-stage compressor of level operations.Processing circuit unit 86 uses use In ten coefficient performance models of capacity and power to calculate for each independent manipulation mode associated with multi-joint compressor 14 Assessment capacity and assessment power consumption.For example, as shown in Figure 3, non-uniform three-member type compressor has 11 phases Associated operation mode.In this case, processing circuit unit will use ten systems for incomparable inconsistent three-member type compressor Number performance models disappear come the capacity of assessment and the power of assessment for calculating for each operation mode in 11 operation modes Consumption.

At step 124, processing circuit unit 86 receives the capacity fault tolerance (ET) from memory 78.The ET can be with It is stored and is set in memory and initially by setter or manufacturer.The ET can also be changed by the user of system. Processing circuit unit 86 is subsequently used for the capability value of the assessment of each independent operation mode compared with target capacity, and Do not considered at step 128 with the assessment capability value beyond goal systems capacity plus or minus the range of fault tolerance (ET) All patterns.In other words, have the arbitrary of the assessment capability value in the fault tolerance (ET) for not falling within goal systems capacity Operation mode is not considered.

At step 132, processing circuit unit 86 to being analyzed for the performance number of remaining operation mode in consideration, And selection has the operation mode of minimum assessment power dissipation from the operation mode not being excluded in step 128.Mould The lowest power mode for meeting assessment system capacity in formula is optimization model, because lowest power mode meets target capacity Plus/minus fault tolerance (ET), while using the power of minimum.In other words, Optimum Operation pattern corresponds to multi-joint compressor 14 The power that can meet target capacity while consume minimum configuration.

At step 136, processing circuit unit 86 enables the contactor 38 and solenoid of multi-joint compressor 14 as needed 36 to realize optimization model or optimum state.As discussed above, optimum state will meet capacity need under lowest power mode It asks.In some cases, the current mode of multi-joint compressor 14 can already correspond to Optimum Operation pattern.In this feelings Under condition, processing circuit unit 86 need not enable or deactivate any compressor, or have no need to change any double-stage compressor Capacitance grade realize Optimum Operation pattern.In other cases, current mode can be different from Optimum Operation pattern. In this case, processing circuit unit 86 make as needed compressor enable or deactivate and order any double-stage compressor with Suitable capacitance grade operation, to realize Optimum Operation pattern.

At step 140, processing circuit unit 86 waits for and determines the stabilization of multi-joint compressor.For example, more leaving Join the derivative value of the discharge pipe line temperature of compressor 14 close to before stablizing, processing circuit unit waits for.Only for example, working as derivative value Within the period of setting close to low value or threshold value (only for example, derivative value be less than in two minutes three degrees Fahrenheits (° F)), the derivative value of discharge pipe line temperature reaches stable.When the derivative value of discharge pipe line temperature is close to be stablized, multi-joint compressor 14 operate under Optimal State.Optimised state or Optimal State make compressor adjust optimization to meet from refrigeration system 12 Capacity requirement and the performance of multi-joint compressor 14 is set to optimize by reducing power consumption.

At step 144, system controller 46 can with command process circuit device 86 with the demand for capacity Stop the compressor in multi-joint compressor 14 when being eliminated.For example, once having reached the mesh in cooling or refrigeration space Temperature is marked, system can eliminate cooling demand.Processing circuit unit 86 then follows the power of pre-programmed to stop routine.Processing Circuit device 86 will make the compressor in multi-joint compressor 14 once stop one.Only for example, compressor can be with peak capacity The order of compressor to lowest capacity compressor stops.In another example, compressor can be turned off with the order of position, first C is turned off, B is then turned off, is then powered off A.

Based on cooling requirement, instead of continuing step 144, which can order new size.This In the case of, processing circuit will be subsequently returned to step 104 and start again at optimal algorithm.

Example embodiment is provided so that the disclosure will be thorough and will be fully to the common skill of this field Art personnel convey range.The many details that set forth example of such as specific components, apparatus, and method etc, with offer pair The thorough explanation of embodiment of the present disclosure.It will be obvious to one of ordinary skill of the art that tool need not be used Body details can implement example embodiment with many different forms, also, detail and example embodiment are not It should be interpreted to limit the scope of the present disclosure.In some example embodiments, well known process, public affairs are not described in detail The apparatus structure known and well known technology.

Term used herein is only used for describing specific example embodiment, and is not intended to and is limited.Such as Used herein, singulative "a", "an" and "the" can also be intended to include plural form, unless context is another It clearly states.Term " comprising ", " including ", "comprising" and " having " they are inclusive, and therefore illustrate to be illustrated The presence of feature, entirety, step, operations, elements, and/or components, but it is not excluded for one or more other features, entirety, step Suddenly, operation, the presence of component, assembly unit and/or its group or additional.Method and step, process and operation described herein should not It is interpreted that the certain order to discuss or illustrate is necessarily required to execute, is unless otherwise specified the order of execution.Also answer When understanding, other step or alternative step may be used.

Although herein various component, assembly units, area may be described using term " first ", " second " and " third " etc. Domain, layer and/or section, but these component, assembly units, region, layer and/or section should not be limited by these terms.These arts Language can be only used for distinguishing a component, assembly unit, region, layer or section with another region, layer or section.Unless up and down Text clearly indicates, otherwise the term of such as " first ", " second " and other numerical terms etc is as used herein Order or sequence is not implied that.Therefore, can by first element as discussed below, the first component, first area, first layer or First section is referred to as second element, second component, second area, the second layer or the second section, without departing from example embodiment Teaching.

For ease of description, may be used in text with the term of space correlation such as "inner", "outside", " ... below ", " in ... lower section ", "lower", " in ... top ", "upper" and similar terms are to describe an elements or features as shown in figures Relationship relative to another (a little) elements or features.With the term of space correlation can be intended to include device in use or operation The different orientations in addition to discribed orientation in attached drawing.For example, if the device in attached drawing is reversed, it is described as Other elements or features " lower section " or " below " element will be oriented in " top " of other elements or features.Cause This, exemplary term " in ... lower section " may include above and below two kinds of orientations.Device can orient (rotation 90 in other ways Degree or in other orientations) and used herein do corresponding explanation with the description of space correlation.

In this application, including defined below, term controller or term module can be replaced with term circuit.Term Controller or term module may refer to following item, be a part for following item or including following item:Application-specific integrated circuit (ASIC);Number, simulation or hybrid analog-digital simulation/number discrete circuit;Number, simulation or hybrid analog-digital simulation/digital integrated electronic circuit;Combination Logic circuit;Field programmable gate array (FPGA);Execute the processor (shared, dedicated or group) of code;Storage by Manage the memory (shared, dedicated or group) for the code that device executes;Other suitable hardware componenies of the function are provided;Or Above some or all of combination, such as in system on chip.

Term code as used above may include software, firmware and/or microcode, and may refer to program, example Journey, function, class and or object.Term shared processor includes execute some or all of codes from multiple modules single Processor.Term processor includes that additional processor is combined to execute some or all generations from one or more modules The processor of code.Term shared memory includes storing the single memory of some or all codes from multiple modules.Art Language group memory includes the storage for combining some or all codes of the additional memory storage from one or more modules Device.Term memory is the subset of term computer-readable medium.Term computer-readable medium does not include being propagated by medium Transient state electricity or electromagnetic signal, and therefore, term computer-readable medium is considered tangible and non-transient.It is non- The non-limiting example of transient state visible computer readable medium includes that nonvolatile memory, volatile memory, magnetism are deposited Reservoir and optical memory.

Device and method described in this application can be one or more by being executed by one or more reservoirs A computer program is partially or even wholly realized.Computer program includes being stored at least one non-transient tangible computer Processor-executable instruction on readable medium.Computer program can also include or dependent on storage data.

The foregoing description to embodiment has been provided for the purpose of illustration and description.It is not intended to the disclosure into Row is exhaustive or limits.The each element or feature of particular implementation is typically not limited to the particular implementation, although not having Body shows or describes, however, under applicable circumstances, each element or feature is interchangeable and can be in selected embodiment It uses.Each element or feature can also be varied in many ways.Such variation is not considered deviating from the disclosure, and institute There is such modification to be intended to be included within the scope of the present disclosure.

Claims

1. a kind of system, including:

Multiple compressors, the multiple compressor are coupled by common discharge pipe line and common suction line parallel connection;

Evaporator;

Condenser;And

System controller, the system controller determine the saturation of the saturation evaporator temperature of the evaporator, the condenser Condensation temperature, the target capacity demand for the multiple compressor and based on the saturation evaporator temperature and it is described satisfy With the power consumption of the power system capacity and assessment of the assessment of each operative configuration for the multiple compressor of condensation temperature;

Wherein, the system controller will be needed for the power system capacity of the assessment of each operative configuration and the target capacity Summation fault tolerance value is compared, and the power consumption of the assessment based on the comparison and for each operative configuration To select the Optimum Operation pattern of the multiple compressor, the Optimum Operation pattern to be selected from the power system capacity assessed described in one group Operative configuration in the fault tolerance of the target capacity demand, and the Optimum Operation pattern has in this set most Low associated power dissipation;And

Wherein, the enabling of the multiple compressor of the System Controller commands and deactivate to realize selected Optimum Operation mould Formula.

2. system according to claim 1, wherein the multiple compressor have at least one fixed-capacity compressor and At least one double-stage compressor.

3. system according to claim 2, wherein at least one double-stage compressor includes having delay intake system Compressor.

4. system according to claim 2, wherein at least one double-stage compressor includes the pressure for having variable speed driver Contracting machine.

5. system according to claim 2, wherein at least one double-stage compressor includes having scrollwork piece-rate system Compressor.

6. system according to claim 1, wherein there is the multiple compressor variable volume to compare compressor.

7. system according to claim 1, wherein the power system capacity of the assessment is based in the multiple compressor The feature of each compressor calculates.

8. system according to claim 1, wherein the operative configuration for the multiple compressor includes described more The position of each compressor in a compressor and coefficient performance curve for each compressor in the multiple compressor.

9. system according to claim 1, wherein the system controller is based on the institute in associated operative configuration Ten coefficient performance curves of each compressor in multiple compressors are stated to determine the assessment for each operative configuration Power consumption.

10. system according to claim 1, wherein the system controller is based in associated operative configuration Ten coefficient performance curves of each compressor in the multiple compressor determine the assessment for each operative configuration Power system capacity.

11. system according to claim 1, wherein the system controller is before selecting the Optimum Operation pattern Judge whether the multiple compressor is stable, is passed based on electric current about whether the multiple compressor has been stabilized judgement Sensor, common suction line temperature sensor, common discharge pipe line temperature sensor, common suction line pressure sensing The output valve of at least one of device and common discharge pipe line pressure sensor.

12. system according to claim 1, wherein the multiple compressor includes a double-stage compressor and two tools There is the fixed-capacity compressor of different capabilities, and the multiple compressor has 11 associated operative configurations.

13. system according to claim 1, wherein the multiple compressor includes two fixed-capacity compressor sums One double-stage compressor, wherein described two fixed-capacity compressors and one double-stage compressor have different capabilities, and And the multiple compressor has seven associated operative configurations.

14. a kind of system, including:

First circuit, first circuit, which has, to be coupled by the first common discharge pipe line and the first common suction line parallel connection Multiple first compressors;

Second servo loop, the second servo loop, which has, to be coupled by the second common discharge pipe line and the second common suction line parallel connection Multiple second compressors;And

System controller, the system controller are determined based on saturation evaporator temperature and saturation condensation temperature for described the The system of the assessment of each operative configuration of multiple compressors in multiple compressors and the second servo loop in primary Ioops is held The power consumption of amount and assessment;

Wherein, power system capacity of the system controller based on the assessment for each operative configuration and target capacity demand Comparison with fault tolerance value and the power consumption based on the assessment for each operative configuration and in first circuit Multiple compressors and the second servo loop in the Optimum Operation patterns of multiple compressors selected, the Optimum Operation mould Formula is selected from operative configuration of the power system capacity assessed described in one group in the fault tolerance of the target capacity demand, and described Optimum Operation pattern has minimum associated power dissipation in this set;And

Wherein, multiple in multiple compressors and the second servo loop of the System Controller commands in first circuit The enabling of compressor and deactivate, to realize selected Optimum Operation pattern.

15. a kind of method for operating system, including:

Determine the saturation evaporator temperature of evaporator, the saturation condensation temperature of condenser and the target for multiple compressors Capacity requirement;

Each behaviour for the multiple compressor is determined based on the saturation evaporator temperature and the saturation condensation temperature Make the power consumption of the power system capacity and assessment of the assessment configured;

It will be carried out for the power system capacity of the assessment of each operative configuration and the target capacity demand and fault tolerance value Compare;

Select the multiple compression based on the comparison and based on the power consumption of the assessment for each operative configuration The Optimum Operation pattern of machine, the Optimum Operation pattern are selected from the power system capacity assessed described in one group in the target capacity demand Fault tolerance in operative configuration, and the Optimum Operation pattern has minimum associated power consumption in this set Value;And

It orders the enabling of the multiple compressor and deactivates to realize selected Optimum Operation pattern.

16. according to the method for claim 15, wherein the multiple compressor includes fixed-capacity compressor, twin-stage pressure Contracting machine and variable volume are than at least one of compressor, wherein if the multiple compressor includes double-stage compressor, institute Double-stage compressor is stated to include the compressor with delay intake system, the compressor with variable speed driver and with scrollwork divide At least one of compressor from system.

17. according to the method for claim 15, further include based on the operative configuration for the multiple compressor come Calculate the power system capacity of the assessment.

18. according to the method for claim 17, wherein the operative configuration for the multiple compressor includes described The position of each compressor in multiple compressors and ten coefficient performances for each compressor in the multiple compressor Curve.

19. further including according to the method for claim 15, based on for multiple compressions in associated operative configuration Ten coefficient performance curves of each compressor in machine determine the power consumption of the assessment for each operative configuration.

20. further including according to the method for claim 15, based on for multiple compressions in associated operative configuration Ten coefficient performance curves of each compressor in machine determine the power system capacity of the assessment for each operative configuration.

21. according to the method for claim 15, further include judge before selecting the Optimum Operation pattern it is the multiple Whether whether compressor is stable, be stabilized and judged based on current sensor, jointly about the multiple compressor Suction line temperature sensor, common discharge pipe line temperature sensor, common suction line pressure sensor and common The output valve of at least one of discharge pipe line pressure sensor.