CN104566773B - Capacity control method and system of multi-connected air conditioner - Google Patents
Capacity control method and system of multi-connected air conditioner Download PDFInfo
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- CN104566773B CN104566773B CN201310516032.2A CN201310516032A CN104566773B CN 104566773 B CN104566773 B CN 104566773B CN 201310516032 A CN201310516032 A CN 201310516032A CN 104566773 B CN104566773 B CN 104566773B
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- 230000009183 running Effects 0.000 claims description 9
- 238000004378 air conditioning Methods 0.000 claims description 8
- 238000005457 optimization Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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Abstract
The invention provides a capacity control method and a capacity control system of a multi-connected air conditioner, which comprise the following steps: when the unit is stopped, detecting whether a load demand exists, and if the load demand exists, starting to operate the first compressor; continuously detecting whether the load is increased or not, and detecting to obtain an operation target frequency value; if the load is increased and the operation target frequency is greater than the preset second frequency value, the second compressor is started to operate, and the first compressor and the second compressor operate simultaneously; and under the current working condition, the energy efficiency ratio value of the first compressor and the second compressor of the multi-connected air conditioner in the simultaneous operation is higher than the energy efficiency ratio value of the first compressor only in the operation. Therefore, the instruction for controlling the start and stop of the compressor is obtained by comparing the frequency values and judging the energy efficiency ratio value. The invention can improve the energy efficiency ratio of the multi-connected air conditioner to the maximum extent, and can ensure that the compressor operates in the frequency interval with the optimal energy efficiency ratio to the maximum extent, so that the multi-connected air conditioner meets the requirement of the highest efficiency, and the effects of energy conservation and emission reduction are achieved.
Description
Technical field
The present invention relates to the control technology field of combined air conditioners, more particularly to a kind of capacity control method of combined air conditioners
And control system, it is particularly suited for a kind of combined air conditioners capacity control techniques of Multi-compressor parallel.
Background technology
With the popularization of converter technique, multi-variable air conditioning unit has obtained swift and violent development.Compared with common air-conditioning, multi-joint sky
Adjust unit have the advantages that refrigeration, heat it is rapid powerful, energy-efficient, comfortable reliable, add its free combination arrange, it is excellent
Part-load efficiency and flexible application method, make multi-variable air conditioning unit that extensive use has been commercially available.
Compressor is the part of most critical in multi-variable air conditioning unit.Characteristic according to compressor has to compressor operating
Effect control, there is direct relation to energy saving of system.
For the combined air conditioners of Multi-compressor parallel, compressor set is connected in the form of parallel connection, its volume controlled side
Method need to meet following requirement：1st, when only part indoor units work, disclosure satisfy that the overall power consumption of system reaches most
It is small；2nd, the compressor set being connected in parallel can be suitably used in large capacity conditioner unit, and the indoor set quantity of its connection is generally more, and
The load of indoor set is not fixed, and may be constantly in being continually changing, therefore requires that the capacity of compressor set can be according to load
Change and consecutive variations, for example can be adjustable in the range of 10%~130%；Therefore the volume controlled of compressor is negative with system
Lotus matching is just particularly important.3rd, should to meet the maximum cold requirement of system (i.e. whole for the whole range of capacity of compressor
The situation that indoor units are operated at full capacity), efficiency highest demand is met again, it is accomplished by between both using efficient pressure
Contracting machine capacity control techniques could be realized.
Accordingly, it would be desirable to be improved to the capacity control method and control system of combined air conditioners.
The content of the invention
The technical problems to be solved by the invention are the capacity control method and control system for providing a kind of combined air conditioners,
May insure that compressor farthest runs on the frequency separation of optimal Energy Efficiency Ratio so that combined air conditioners meet efficiency highest
It is required that.
The present invention is achieved through the following technical solutions：
The capacity control method of combined air conditioners, for controlling to include many of outdoor unit and the interconnection of at least one indoor set
Connection air-conditioning, the outdoor unit includes the compressor of more than two, and the compressor of more than two is connected by the way of parallel connection；Its
In, the capacity control method of the combined air conditioners comprises the following steps：
1) during compressor emergency shutdown, workload demand has been detected whether, if there is workload demand, the operation of the first compressor starts；
2) whether detection load increases, and detection obtains operational objective frequency values；If load increases and operational objective frequency
During more than default second frequency value, then the second compressor also startup optimization, now the first compressor and the same luck of the second compressor
OK；Now the Rule of judgment of control start/stop of compressor need to meet simultaneously：Under current operating mode, the compressor of combined air conditioners first and second
The Energy Efficiency Ratio numerical value that compressor runs simultaneously is higher than the Energy Efficiency Ratio numerical value for only running the first compressor.
Wherein in one embodiment, the capacity control method of the combined air conditioners also includes：
3) whether detection load reduces, and detection obtains operational objective frequency values；If load reduces and operational objective frequency
Value is less than when presetting first frequency value, then the first compressor operating, the second compressor shutdown.
Further, preset first frequency value and be less than default second frequency value.
Further, step 2) in, when the first compressor and the second compressor operating, during three compressor shutdowns, continue
Whether detection load increases, and detection obtains operational objective frequency values；If load continues to increase and operational objective frequency is more than pre-
If the 4th frequency values, then the first compressor, the second compressor, the 3rd compressor all run；Now control start/stop of compressor
Rule of judgment need to meet simultaneously：Under current operating mode, the compressor of combined air conditioners first, the second compressor, the 3rd compressor are all transported
Capable Energy Efficiency Ratio numerical value is higher than the first compressor, the second compressor operating, the Energy Efficiency Ratio numerical value of the 3rd compressor shutdown.
Further, step 2) in, whether detection load reduces, and detection obtains operational objective frequency values；If load subtracts
Small and target frequency is less than when presetting three frequency values, then the first compressor, the second compressor operating, the 3rd compressor shutdown.
Further, the 3rd frequency values are preset and is less than default 4th frequency values.
Further, preset second frequency value and be less than default 3rd frequency values.
The capacity control system of combined air conditioners, for controlling to include many of outdoor unit and the interconnection of at least one indoor set
Connection air-conditioning, the outdoor unit includes the compressor of more than two, and the compressor of more than two is connected by the way of parallel connection；Its
In, the capacity control system of the combined air conditioners is included：
Frequency detecting unit, the compressor actual motion frequency values of combined air conditioners are obtained for detecting；
Cutting load testing unit, combined air conditioners actual negative charge values are obtained for detecting；
Target frequency value arithmetic element, the target frequency value for obtaining compressor operating；
Energy Efficiency Ratio numerical value is detected and comparing unit, for by the detection to combined air conditioners operational factor, and by comparing,
The Energy Efficiency Ratio numerical value under different operational modes under current operating mode is obtained, and by comparing, obtains Energy Efficiency Ratio numerical value preferably capacity
Control mode；
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency values；
Frequency comparing unit, for target frequency value and predeterminated frequency value to be compared；
Compressor control unit, for controlling start/stop of compressor to act；
The target frequency value arithmetic element obtains the actual fortune of compressor of combined air conditioners according to frequency detecting unit detection
Line frequency value and the detection of cutting load testing unit obtain combined air conditioners actual negative charge values, and computing obtains the target frequency of compressor operating
Value；It is right that frequency comparing unit carries out target frequency value and the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell
Than obtaining frequency values comparing result；Energy Efficiency Ratio numerical value is detected and comparing unit is obtained under current operating mode under different operational modes
Energy Efficiency Ratio numerical value, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode；According to frequency values comparing result and energy
Effect controls each compressor start-stop than numerical value preferably volume controlled mode result.
Further, the predeterminated frequency value memory cell includes default first frequency unit and default second frequency list
Unit；The default first frequency unit is used to store default first frequency numerical value, and the default second frequency unit is used to store
Default second frequency numerical value.
Further, the predeterminated frequency value memory cell includes default 3rd frequency cells and default 4th frequency list
Unit；Default 3rd frequency cells are used to store default 3rd frequency values, and default 4th frequency cells are used to store
Default 4th frequency values.
Beneficial effects of the present invention are as follows：
The capacity control method and control system of combined air conditioners of the invention, comprise the following steps：During compressor emergency shutdown, detection
Whether workload demand is had, if there is workload demand, the operation of the first compressor starts；Continue whether detection load increases, and detect
To operational objective frequency values；If load increases and operational objective frequency is more than default second frequency value, the second compressor
Startup optimization, now the first compressor and the second compressor run simultaneously；And at present under operating mode, the compressor of combined air conditioners first and
The Energy Efficiency Ratio numerical value that second compressor runs simultaneously is higher than the Energy Efficiency Ratio numerical value for only running the first compressor.Therefore, by right
The contrast of frequency values and the judgement of Energy Efficiency Ratio numerical value, obtain controlling the instruction of start/stop of compressor.The present invention can be farthest
Improve the Energy Efficiency Ratio of combined air conditioners, it can be ensured that compressor farthest runs on the frequency separation of optimal Energy Efficiency Ratio so that
Combined air conditioners meet efficiency highest demand, play the effect of energy-saving and emission-reduction.
Brief description of the drawings
Fig. 1 is the relation curve schematic diagram of compressor frequency and Energy Efficiency Ratio；
Fig. 2 is that the curve of compressor frequency and Energy Efficiency Ratio relation after capacity control method using combined air conditioners of the present invention shows
It is intended to；
Fig. 3 is the schematic flow sheet of the capacity control method of combined air conditioners of the present invention.
Specific embodiment
The present invention is in order to solve problem of the prior art, it is proposed that a kind of capacity control method of combined air conditioners, for controlling
System includes the combined air conditioners that outdoor unit and at least one indoor set are connected with each other, and the outdoor unit includes the compression of more than two
Machine, the compressor of more than two is connected by the way of parallel connection；Wherein, the capacity control method of the combined air conditioners includes as follows
Step：
1) during compressor emergency shutdown, workload demand has been detected whether, if there is workload demand, the operation of the first compressor starts；
2) whether detection load increases, and detection obtains operational objective frequency values；If load increases and operational objective frequency
During more than default second frequency value, then the second compressor also startup optimization, now the first compressor and the same luck of the second compressor
OK；Now the Rule of judgment of control start/stop of compressor need to meet simultaneously：Under current operating mode, the compressor of combined air conditioners first and second
The Energy Efficiency Ratio numerical value that compressor runs simultaneously is higher than the Energy Efficiency Ratio numerical value for only running the first compressor.
Wherein in one embodiment, the capacity control method of the combined air conditioners also includes：
3) whether detection load reduces, and detection obtains operational objective frequency values；If load reduces and operational objective frequency
Value is less than when presetting first frequency value, then the first compressor operating, the second compressor shutdown.
Further, preset first frequency value and be less than default second frequency value.
Further, step 2) in, when the first compressor and the second compressor operating, during three compressor shutdowns, continue
Whether detection load increases, and detection obtains operational objective frequency values；If load continues to increase and operational objective frequency is more than pre-
If the 4th frequency values, then the first compressor, the second compressor, the 3rd compressor all run；Now control start/stop of compressor
Rule of judgment need to meet simultaneously：Under current operating mode, the compressor of combined air conditioners first, the second compressor, the 3rd compressor are all transported
Capable Energy Efficiency Ratio numerical value is higher than the first compressor, the second compressor operating, the Energy Efficiency Ratio numerical value of the 3rd compressor shutdown.
Further, step 2) in, whether detection load reduces, and detection obtains operational objective frequency values；If load subtracts
Small and target frequency is less than when presetting three frequency values, then the first compressor, the second compressor operating, the 3rd compressor shutdown.
Further, the 3rd frequency values are preset and is less than default 4th frequency values.
Further, preset second frequency value and be less than default 3rd frequency values.
The present invention is in order to solve problem of the prior art, it is also proposed that a kind of capacity control system of combined air conditioners, is used for
Control includes the combined air conditioners that outdoor unit and at least one indoor set are connected with each other, and the outdoor unit includes the pressure of more than two
Contracting machine, the compressor of more than two is connected by the way of parallel connection；Wherein, the capacity control system of the combined air conditioners includes
Have：
Frequency detecting unit, the compressor actual motion frequency values of combined air conditioners are obtained for detecting；
Cutting load testing unit, combined air conditioners actual negative charge values are obtained for detecting；
Target frequency value arithmetic element, the target frequency value for obtaining compressor operating；
Energy Efficiency Ratio numerical value is detected and comparing unit, for by the detection to combined air conditioners operational factor, and by comparing,
The Energy Efficiency Ratio numerical value under different operational modes under current operating mode is obtained, and by comparing, obtains Energy Efficiency Ratio numerical value preferably capacity
Control mode；
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency values；
Frequency comparing unit, for target frequency value and predeterminated frequency value to be compared；
Compressor control unit, for controlling start/stop of compressor to act；
The target frequency value arithmetic element obtains the actual fortune of compressor of combined air conditioners according to frequency detecting unit detection
Line frequency value and the detection of cutting load testing unit obtain combined air conditioners actual negative charge values, and computing obtains the target frequency of compressor operating
Value；It is right that frequency comparing unit carries out target frequency value and the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell
Than obtaining frequency values comparing result；Energy Efficiency Ratio numerical value is detected and comparing unit is obtained under current operating mode under different operational modes
Energy Efficiency Ratio numerical value, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode；According to frequency values comparing result and energy
Effect controls each compressor start-stop than numerical value preferably volume controlled mode result.
Further, the predeterminated frequency value memory cell includes default first frequency unit and default second frequency list
Unit；The default first frequency unit is used to store default first frequency numerical value, and the default second frequency unit is used to store
Default second frequency numerical value.
Further, the predeterminated frequency value memory cell includes default 3rd frequency cells and default 4th frequency list
Unit；Default 3rd frequency cells are used to store default 3rd frequency values, and default 4th frequency cells are used to store
Default 4th frequency values.
Embodiment：
Because compressor parallel unit is mainly used in large capacity conditioner unit, its connection indoor set quantity generally compared with
It is many, and the load of indoor set is not fixed, and in may being continually changing always, therefore requires that the capacity of compressor is needed according to load
Change and consecutive variations.
There is its corresponding highest energy efficiency than traffic coverage per money compressor, in Multi-compressor parallel unit, with load
Increase, running frequency needed for compressor needs increase, as shown in Figure 1.From compressor efficiency ratio characteristic, with compressor frequency
Increase, its Energy Efficiency Ratio is first to increase the relation for reducing afterwards, under shed parabolic relation.
The technical method that the present embodiment is used for：
As shown in figure 3, during compressor emergency shutdown, if there is workload demand, the first compressor operating, if load increases and operational objective
When frequency is more than default second frequency value, then the second compressor also startup optimization, is now the first compressor and the second compressor
Operation, the 3rd compressor shutdown, Energy Efficiency Ratio is higher than the energy of the first compressor operating, the second compressor and the 3rd compressor shutdown
Effect ratio；If now load reduces and operational objective frequency is less than when presetting first frequency value, the first compressor operating, the second pressure
Contracting machine and the 3rd compressor shutdown, preset first frequency value and are less than default second frequency value, can thus prevent because negative
Lotus changes and causes the phenomenon of the second high frequent start and stop；
When the first compressor and the second compressor operating, during three compressor shutdowns, if load continues to increase and operation mesh
Mark frequency is more than default 4th frequency values, then the first compressor, the second compressor and the 3rd compressor all run, now the first pressure
The Energy Efficiency Ratio of contracting machine, the second compressor and the 3rd compressor operating is higher than the first compressor, the second compressor operating, the 3rd pressure
The Energy Efficiency Ratio that contracting machine is shut down, if load reduces and target frequency is less than when presetting three frequency values, the first compressor, the second pressure
Contracting machine runs, the 3rd compressor shutdown, presets the 3rd frequency values and is less than default 4th frequency values, can so prevent because negative
Lotus changes and causes the phenomenon of the 3rd high frequent start and stop；
In order to ensure that compressor occurs without the situation of frequent starting in load alternation process, also need to ensure the first default frequency
Rate is less than the second predeterminated frequency, and the second predeterminated frequency is less than the 3rd predeterminated frequency, and the 3rd predeterminated frequency is less than the 4th predeterminated frequency.
In order to ensure the optimal Energy Efficiency Ratio of unit operation, the setting of predeterminated frequency is most important, it is necessary to assure when unit exists
When being run less than the first predeterminated frequency, the Energy Efficiency Ratio of single compressor operation is higher than the Energy Efficiency Ratio that double-compressor runs simultaneously, it is necessary to
Ensure when unit more than the second predeterminated frequency when running, the Energy Efficiency Ratio that double-compressor runs simultaneously is higher than single compressor operation
Energy Efficiency Ratio, it is necessary to assure when unit less than the 3rd predeterminated frequency when running, the Energy Efficiency Ratio that double-compressor runs simultaneously is higher than three
The Energy Efficiency Ratio that compressor runs simultaneously, it is necessary to assure when unit more than the 4th predeterminated frequency when running, the same luck of three compressors
Capable Energy Efficiency Ratio is higher than the Energy Efficiency Ratio that double-compressor runs simultaneously.
Fig. 2 is the graph of relation of compressor frequency and Energy Efficiency Ratio, after technical scheme, it is ensured that machine
Group run on highest energy efficiency than frequency separation.
The method is equally applicable in modularization unit.
By taking two certain frequency conversion two-spool compressor parallel connections as an example, Energy Efficiency Ratio and the compressor frequency under shed of compressor
Parabolic relation, compressor Energy Efficiency Ratio highest frequency separation is between 40-70Hz.Therefore, when indoor set load is relatively low, only needing
Start 1 compressor, when the target frequency of indoor set burden requirement single compressor operation is higher than default second frequency value 70Hz
When, then can switch to open two compressor parallel runnings, the Energy Efficiency Ratio of now two compressor intermediate frequencies operation can be higher than separate unit pressure
The Energy Efficiency Ratio of contracting machine high frequency operation.When indoor set load reduction, in order to prevent from causing because of the fluctuation of load the frequency of compressor
Numerous start-stop, then when needing to be reduced to the default first frequency value 25Hz of two operations, just close a compressor, only opens a pressure
Contracting machine runs.Concrete numerical value herein is provided to the citing of explanation, and different compressor frequencies is interval different.
Embodiment described above only expresses embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
Enclose.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. the capacity control method of combined air conditioners, for controlling to include the multi-joint of outdoor unit and at least one indoor set interconnection
Air-conditioning, the outdoor unit includes the compressor of more than two, and the compressor of more than two is connected by the way of parallel connection；It is special
Levy and be, the capacity control method of the combined air conditioners comprises the following steps：
1) during compressor emergency shutdown, workload demand has been detected whether, if there is workload demand, the operation of the first compressor starts；
2) whether detection load increases, and detection obtains operational objective frequency values；If load increases and operational objective frequency is more than
During default second frequency value, then the second compressor also startup optimization, now the first compressor and the second compressor run simultaneously；This
When control start/stop of compressor Rule of judgment need to meet simultaneously：Under current operating mode, the compressor of combined air conditioners first and second compresses
The Energy Efficiency Ratio numerical value that machine runs simultaneously is higher than the Energy Efficiency Ratio numerical value for only running the first compressor；
3) whether detection load reduces, and detection obtains operational objective frequency values；If load reduces and operational objective frequency values are small
When default first frequency value, then the first compressor operating, the second compressor shutdown；
The default first frequency value is less than default second frequency value.
2. the capacity control method of combined air conditioners according to claim 1, it is characterised in that step 2) in, when the first pressure
Contracting machine and the second compressor operating, during three compressor shutdowns, continue whether detection load increases, and detection obtains operational objective
Frequency values；If load continues to increase and operational objective frequency is more than default 4th frequency values, the first compressor, the second compression
Machine, the 3rd compressor all run；Now the Rule of judgment of control start/stop of compressor need to meet simultaneously：It is multi-joint under current operating mode
The Energy Efficiency Ratio numerical value that the compressor of air-conditioning first, the second compressor and the 3rd compressor all run is higher than the first compressor, second
The Energy Efficiency Ratio numerical value of compressor operating and the 3rd compressor shutdown.
3. the capacity control method of combined air conditioners according to claim 2, it is characterised in that step 2) in, detection load
Whether reduce, and detection obtains operational objective frequency values；If load reduces and target frequency is less than default three frequency values,
First compressor, the second compressor operating, the 3rd compressor shutdown.
4. the capacity control method of combined air conditioners according to claim 3, it is characterised in that default 3rd frequency values
Less than default 4th frequency values.
5. the capacity control method of combined air conditioners according to claim 4, it is characterised in that the default second frequency value
Less than default 3rd frequency values.
6. using combined air conditioners as any one of claim 1 to 5 capacity control method combined air conditioners appearance
Amount control system, for controlling to include the combined air conditioners that outdoor unit and at least one indoor set are connected with each other, the outdoor unit bag
The compressor of more than two is included, the compressor of more than two is connected by the way of parallel connection；Characterized in that, the multi-joint sky
The capacity control system of tune is included：
Frequency detecting unit, the compressor actual motion frequency values of combined air conditioners are obtained for detecting；
Cutting load testing unit, combined air conditioners actual negative charge values are obtained for detecting；
Target frequency value arithmetic element, the target frequency value for obtaining compressor operating；
Energy Efficiency Ratio numerical value is detected and comparing unit, for by the detection to combined air conditioners operational factor, and by comparing, is obtained
Energy Efficiency Ratio numerical value under current operating mode under different operational modes, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled
Mode；
Predeterminated frequency value memory cell, for storing multiple predeterminated frequency values；
Frequency comparing unit, for target frequency value and predeterminated frequency value to be compared；
Compressor control unit, for controlling start/stop of compressor to act；
The target frequency value arithmetic element detects the compressor actual motion for obtaining combined air conditioners according to frequency detecting unit frequently
Rate value and the detection of cutting load testing unit obtain combined air conditioners actual negative charge values, and computing obtains the target frequency value of compressor operating；
Frequency comparing unit is contrasted target frequency value to the corresponding predeterminated frequency value stored in predeterminated frequency value memory cell, is obtained
To frequency values comparing result；The Energy Efficiency Ratio that Energy Efficiency Ratio numerical value is detected and comparing unit obtains under current operating mode under different operational modes
Numerical value, and by comparing, obtain Energy Efficiency Ratio numerical value preferably volume controlled mode；According to frequency values comparing result and Energy Efficiency Ratio number
Value preferably volume controlled mode result, controls each compressor start-stop.
7. the capacity control system of combined air conditioners according to claim 6, it is characterised in that the predeterminated frequency value storage
Unit includes default first frequency unit and default second frequency unit；The default first frequency unit is used to store default
First frequency numerical value, the default second frequency unit is used to store default second frequency numerical value.
8. the capacity control system of combined air conditioners according to claim 7, it is characterised in that the predeterminated frequency value storage
Unit includes default 3rd frequency cells and default 4th frequency cells；Default 3rd frequency cells are used to store default
3rd frequency values, default 4th frequency cells are used to store default 4th frequency values.
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