CN209326132U - Air-conditioning system - Google Patents
Air-conditioning system Download PDFInfo
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- CN209326132U CN209326132U CN201920030737.6U CN201920030737U CN209326132U CN 209326132 U CN209326132 U CN 209326132U CN 201920030737 U CN201920030737 U CN 201920030737U CN 209326132 U CN209326132 U CN 209326132U
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Abstract
The utility model relates to a kind of air-conditioning systems, including compressor set, outdoor heat exchanger, throttling set and indoor heat exchanger.The compressor set, the outdoor heat exchanger, the throttling set and the indoor heat exchanger form circulation loop.The compressor set includes at least two compressor branches parallel with one another, is provided at least one compressor on compressor branch road described in each, wherein the total displacement of the compressor of any two compressor branch road is different.It is connected according to the compressor branch of the different compressor displacement of the selection of different sizes of required refrigeration or heating load, the compressor branch of opening associated compressors discharge capacity is under Smaller load, middle load and big workload demand with environment indoors, to meet the refrigeration of indoor environment different load or the actual demand of heating, reach the target temperature and refrigeration or heating capacity demand of user.
Description
Technical field
The utility model relates to air-conditioning technical fields, more particularly to a kind of air-conditioning system.
Background technique
As the improvement of people's living standards, air conditioner is more more and more universal, people's life and work place is almost had become
Necessity.Commercial air conditioning system generallys use the solution of multiple compressor parallels since its capacity is larger.The prior art is all
It is, Toshiba in parallel using multiple scroll compressors using the compressor of multiple same forms, such as common great Jin multi-connected machine
Multi-connected machine is in parallel using multiple rotor-type compressors.However, using multiple same form compressor parallels and concatenated air-conditioning system
Efficiency of uniting is lower.
Utility model content
The utility model problem lower for existing air-conditioning system efficiency, provides a kind of air-conditioning system of high energy efficiency.
A kind of air-conditioning system, including compressor set, outdoor heat exchanger, throttling set and indoor heat exchanger:
The compressor set, the outdoor heat exchanger, the throttling set and the indoor heat exchanger form circulation loop；
The compressor set includes at least two compressor branches parallel with one another, on compressor branch road described in each
It is provided at least one compressor, wherein the total displacement of the compressor of any two compressor branch road is different.
The compressor branch includes the first compressor branch and the second pressure parallel with one another in one of the embodiments,
Contracting machine branch, the first compressor branch road are provided with the first compressor, and the second compressor branch road is provided with second
Compressor, the discharge capacity of first compressor are greater than the discharge capacity of second compressor.
First compressor is scroll compressor in one of the embodiments, and second compressor is rotor
Formula compressor.
The first control for controlling its on-off is provided on the first compressor branch road in one of the embodiments,
Valve processed, the second compressor branch road are provided with the second control valve for controlling its on-off.
First control valve and second control valve are solenoid valve in one of the embodiments,.
It in one of the embodiments, further include four-way valve, the first port of the four-way valve and the compressor set
Exhaust outlet connection, the second port of the four-way valve are connected to the outdoor heat exchanger, the third port of the four-way valve and institute
The air inlet connection of compressor set is stated, the 4th port of the four-way valve is connected to the indoor heat exchanger, wherein
The first port of the four-way valve is connected to the second port of the four-way valve, the third port of the four-way valve with
4th port of the four-way valve is connected to；
Alternatively,
The first port of the four-way valve is connected to the 4th port of the four-way valve, the second port of the four-way valve with
The third port of the four-way valve is connected to.
In one of the embodiments, further include gas-liquid separator, the gas-liquid separator be set to the four-way valve with
Between the air inlet of the compressor set.
The throttling set is heating power expansion valve or electric expansion valve in one of the embodiments,.
The scroll compressor is constant speed compressor, digital compressor or speed change compression in one of the embodiments,
Machine.
The rotor-type compressor is stator formula rotor-type compressor or sliding rotary formula in one of the embodiments,
Compressor.
Technical solution in above-described embodiment at least generates following technical effect.
Above-mentioned air-conditioning system, including compressor set, outdoor heat exchanger, throttling set and indoor heat exchanger.The compression
Unit, the outdoor heat exchanger, the throttling set and the indoor heat exchanger form circulation loop.The compressor set includes
At least two compressor branches parallel with one another are provided at least one compressor on compressor branch road described in each,
Wherein the total displacement of the compressor of any two compressor branch road is different.According to required refrigeration or the size of heating load
The compressor branches that difference chooses different compressor displacement are connected, and be in Smaller load, middle load with environment indoors and are greatly born
The compressor branch of associated compressors discharge capacity is opened under lotus demand, to meet the refrigeration of indoor environment different load or the reality of heating
Border demand reaches the target temperature and refrigeration or heating capacity demand of user.Power consumption is efficiently reduced, the energy is saved, is improved
The efficiency of air-conditioning system.Such as when air-conditioning system is in underrun, the compressor branch for opening small displacement is run, and is closed
The compressor branch of huge discharge, so that air-conditioning system meets the heating or refrigeration demand of indoor environment, Ke Yishi with lower power consumption
Unit output under existing underload is smaller, and room temperature fluctuation is smaller, and comfort is higher, efficiently reduces power consumption, saves
The energy improves the efficiency of air-conditioning system；And when air-conditioning system is in heavy-duty service, while opening the compressor branch of huge discharge
The compressor branch of road and small displacement operation, to meet the refrigeration of indoor environment high load capacity or the actual demand of heating.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide a further understanding of the present invention, the utility model
Illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the air-conditioning system of an embodiment of the present invention；
System principle when Fig. 2 is the air-conditioning system of an embodiment of the present invention in refrigeration mode and underrun
Schematic diagram；
System principle when Fig. 3 is the air-conditioning system of an embodiment of the present invention in refrigeration mode and heavy-duty service
Schematic diagram；
Fig. 4 is in system principle when heating mode and underrun for the air-conditioning system of an embodiment of the present invention
Schematic diagram；
Fig. 5 is in system principle when heating mode and heavy-duty service for the air-conditioning system of an embodiment of the present invention
Schematic diagram.
Description of symbols:
100- compressor set
110- the first compressor branch
The first compressor of 111-
120- the second compressor branch
The second compressor of 121-
200- outdoor heat exchanger
300- throttling set
400- indoor heat exchanger
500- four-way valve
510- first port
520- second port
530- third port
The 4th port 540-
600- gas-liquid separator
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It is only exemplary to the description of specific embodiment below, it should
Understand, specific implementation described herein is only used to explain the utility model, and is definitely not to the utility model and its application
Or the limitation of usage.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element is referred to as " directly existing " another element "upper",
There is no intermediary elements.On the contrary, intermediary element is not present when element is connect referred to as " direct " with another element.This paper institute
The term "vertical", "horizontal", "left" and "right" used and similar statement are for illustrative purposes only.
In the description of the present invention, it should be understood that term " length ", " width ", " thickness ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "top", "bottom", "inner", "outside" is based on the figure
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model
Limitation.
More detailed elaboration is done to the technical solution of the utility model below in conjunction with attached drawing 1 to Fig. 5.
Referring to Fig. 1, an embodiment of the present invention provides a kind of air-conditioning system, including compressor set 100, outdoor heat exchange
Device 200, throttling set 300 and indoor heat exchanger 400.The compressor set 100, the outdoor heat exchanger 200, the throttling
Device 300 and the indoor heat exchanger 400 form circulation loop.The compressor set 100 includes parallel with one another at least two
Compressor branch is provided at least one compressor on compressor branch road described in each, wherein any two pressures
The total displacement of the compressor of contracting machine branch road is different, i.e., the compressor of any one branch road in all compressor branches in parallel
Total displacement and the total displacement of other branch road compressors are all different.According to it is required refrigeration or heating load it is of different sizes
The compressor branch connection for choosing different compressor displacements, is needed with being in Smaller load, middle load and big load in air-conditioning system
The lower compressor branch for opening associated compressors discharge capacity is sought, to meet the refrigeration of indoor environment different load or the practical need of heating
It asks, reaches the target temperature and refrigerating capacity or heating capacity demand of user.Power consumption is efficiently reduced, the energy is saved, is improved
The efficiency of air-conditioning system.
Optionally, the throttling set 300 is heating power expansion valve or electric expansion valve.Electric expansion valve and heating power expansion valve
It can be carried out expenditure and pressure, electric expansion valve is adjusted in real time according to the degree of superheat of the evaporation detected or the degree of supercooling of condensation
The flow of refrigerant, such control are more flexible also more efficient.
Continuing with referring to Fig. 1, the compressor branch includes the first compression parallel with one another in one of the embodiments,
Machine branch 110 and the second compressor branch 120.The first compressor 111 is provided on the first compressor branch 110, it is described
The second compressor 121 is provided on second compressor branch 120, the discharge capacity of first compressor 111 is greater than second pressure
The discharge capacity of contracting machine 121.
Optionally, first compressor 111 is the centrifugal pressure of the big scroll compressor of discharge capacity either huge discharge
Contracting machine.The scroll compressor can be constant speed compressor, digital compressor or variable speed compressor.Second compressor
121 rotor-type compressors small for discharge capacity, the rotor-type compressor can be stator formula rotor-type compressor, be also possible to slide
Chip rotor-type compressor.As shown in figures 2 or 4, when the load of air-conditioning system is smaller, the second compressor branch 120
Connection and the first compressor branch 110 closing.It can efficiently use that rotor-type compressor discharge capacity is small, minimum exports small excellent
Gesture.Rotor compressor discharge capacity is smaller, and if same operation 10Hz, the circulating mass of refrigerant of the compressor of small displacement is less.In this way
If, the refrigerating capacity of air conditioner output is just lower, and the power of consumption is also smaller, for 26 DEG C of room temperature, user setting temperature
A kind of 25 DEG C of this situations, the thermic load (refrigeration demand) in room is smaller, and air conditioner can be expired with small refrigerating capacity output
On the one hand sufficient demand avoids the too big caused frequent start-stop room temperature fluctuation of air conditioner output, another aspect air conditioner
It is also smaller to export more small-power, runs more energy saving.As shown in Fig. 3 or Fig. 5, when the load of air-conditioning system is larger, described
One compressor branch 110 is connected to the second compressor branch 120.It is vortexed by small displacement rotor compressor and huge discharge
The scheme that compressor combines, the unit output that may be implemented under underload is smaller, and room temperature fluctuation is smaller, and comfort is higher.
The introducing of huge discharge screw compressor can effectively reduce the quantity using multiple small displacement rotor compressors, number of compressors
Reduction, improve system reliability of operation.In the air-conditioning system of double-compressor parallel, the operation quantity of compressor and operation
Frequency be to be adjusted according to user's refrigerating capacity or the demand of heating capacity, from it is small output be increased to export greatly it is common control be:
Then the compressor operating for first opening the 1st small displacement is then turned on the compression of the 2nd huge discharge from low frequency to high frequency
Machine work, this time two compressors work at the same time, while being increased to maximum frequency from low frequency.Therefore, in the system of double-pressing machine,
Using size compressor design, it is more advantageous to the output that underload declines low air conditioner.
For controlling its on-off is provided on the first compressor branch 110 in one of the embodiments,
One control valve is provided with the second control valve for controlling its on-off on the second compressor branch 120.This is that this is practical
The control device and control method of the on-off of two branches for controlling compressor set 100 of novel air-conditioning system, certainly
On-off branch can also be realized by the way of start and stop compressor, but compressor long term frequent start and stop will affect compressor
Service life.
Optionally, first control valve and second control valve are solenoid valve.This is the air-conditioning of the utility model
The preferred structure and type form of the control valve in two controlling brancher channels in system can be realized accurate accurate, convenient fast
Prompt control.
Fig. 2 to Fig. 5 is please referred to, the air-conditioning system further includes four-way valve 500.The first port 510 of the four-way valve 500
It is connected to the exhaust outlet of the compressor set 100, the second port 520 of the four-way valve 500 and the outdoor heat exchanger 200 connect
Logical, the third port 530 of the four-way valve 500 is connected to the air inlet of the compressor set 100, and the of the four-way valve 500
Four ports 540 are connected to the indoor heat exchanger 400.
As shown in Figures 2 and 3, when the air-conditioning system lower operation in refrigeration mode, the first of the four-way valve 500
Port 510 is connected to the second port 520 of the four-way valve 500, the third port 530 of the four-way valve 500 and the four-way
4th port 540 of valve 500 is connected to.The high-temperature high-pressure refrigerant gas that compressor set 100 is discharged passes through four-way valve 500 and outdoor
Heat exchanger 200 connects, and refrigerant is condensed into normal temperature high voltage by the gas release heat of high temperature and pressure in outdoor heat exchanger 200
Refrigerant liquid is the refrigerant liquid of low-temp low-pressure by 300 decrease temperature and pressure of throttling set, inhales by indoor heat exchanger 400
Receive after heat be by the liquid evaporation of low-temp low-pressure low-temp low-pressure refrigerant gas, later by four-way valve 500 and gas-liquid point
It is connected from device 600, after gas-liquid separator 600 is by gas-liquid separation, enters the air entry of compressor set, into following next time
Ring.When underload, according to the refrigeration demand of indoor unit in system or thermic load situation, determine needs the refrigeration cycle
The outdoor unit output wanted, determines and opens compressor 111 or compressor 121, and when high load capacity, two compressors put into fortune simultaneously
Row.Judge that the method for payload has very much, conventional scheme is environment temperature, the environment temperature of indoor according to outside
The temperature of degree and user setting, to be judged, under cooling condition, outdoor temperature is higher, room temperature is higher, user
It is lower that temperature is set, then illustrates that load is bigger, conversely, load is smaller.The size of load can reflect the size of user demand.
As shown in Figure 4 and Figure 5, when the air-conditioning system, which is under heating mode, to be run, the first of the four-way valve 500
Port 510 is connected to the 4th port 540 of the four-way valve 500, the second port 520 of the four-way valve 500 and the four-way
The third port 530 of valve 500 is connected to.The high-temperature high-pressure refrigerant gas that compressor set 100 is discharged passes through four-way valve 500 and interior
Heat exchanger 400 connects, and refrigerant is condensed into normal temperature high voltage by the gas release heat of high temperature and pressure in heat exchanger 400 indoors
Refrigerant liquid is the refrigerant liquid of low-temp low-pressure by 300 decrease temperature and pressure of throttling set, inhales by outdoor heat exchanger 200
Receive after heat be by the liquid evaporation of low-temp low-pressure low-temp low-pressure refrigerant gas, later by four-way valve 500 and gas-liquid point
It is connected from device 600, after gas-liquid separator 600 is by gas-liquid separation, enters the air entry of compressor set, into following next time
Ring.
Fig. 2 to Fig. 5 is please referred to, the air-conditioning system further includes gas-liquid separator 600, and the gas-liquid separator 600 is arranged
Between the four-way valve 500 and the air inlet of the compressor set 100.Gas-liquid separator 600 is to realize refrigerant gas
The separation of body and liquid avoids more with liquid refrigerant in compressor air suction and damages compressor.Usually in design large capacity
Air conditioner all can use gas-liquid separator, since the charging amount of bigger air conditioner refrigerant is more, and in underrun
When, the circularly cooling dosage needed is seldom, return liquid a possibility that it is larger, increase gas-liquid separator 600 system can be improved
Reliability.
Fig. 1 to Fig. 5 is please referred to, an embodiment of the utility model provides a kind of control method of air-conditioning system, the control
Method processed uses the air-conditioning system as shown in any one of above-mentioned technical proposal, which comprises according to air-conditioning system reality
Compressor branch corresponding with the load is opened in the payload on border, selection.
The compressor branch that small displacement is opened when workload demand is small, that is, open the second compressor branch 120.When negative
When lotus demand is big open huge discharge compressor branch, that is, open the first compressor branch 110 or simultaneously open described in
First compressor branch 110 and the second compressor branch 120.By using air-conditioning system above-mentioned and use above-mentioned control
Means processed can select the compressor of small displacement to open in Smaller load, close the compressor branch of huge discharge, make to have leisure
Adjusting system meets the heating or refrigeration demand of indoor environment with lower power consumption, efficiently reduces power consumption, saves the energy.It can be with
Realize that the unit output under underload is smaller, room temperature fluctuation is smaller, and comfort is higher.To meet indoor environment different load
Refrigeration or heating actual demand, have the function that the target temperature and refrigeration or heating capacity of user.Above-mentioned air-conditioning system is also
The compressor that small displacement can be started in Smaller load is run with higher frequency, can not only meet user's refrigeration or heating
The demand of amount but also reduce power consumption, moreover it is possible to which the oil return intensity for improving compressor meets the oil return requirement of compressor, to subtract
The abrasion of small compressor, the service life for extending compressor, improve the operational reliability of air-conditioning system.The controlling party of above-mentioned air-conditioning system
Method still can also normally start operation, energy when single compressor breaks down, controlling an in addition at least compressor
Enough air-conditioning use demands met in emergency circumstances.
In one of the embodiments, when the compressor branch includes 110 He of the first compressor branch parallel with one another
When the second compressor branch 120, when the air-conditioning system actual load is small, the second compressor branch 120 is opened, institute is worked as
State air-conditioning system actual load it is big when, the first compressor branch 110 and the second compressor branch 120 are opened.
In one of the embodiments, when the air-conditioning system has the four-way valve 500, as shown in Figure 4 and Figure 5,
When needing air-conditioning system to heat, the first port 510 for controlling the four-way valve 500 is connected to the 4th port 540,
And the second port 520 is connected with the third port 530.As shown in Figure 3 and Figure 4, when needing air-conditioning system to freeze,
The first port 510 for controlling the four-way valve 500 is connected to the second port 520, the third port 530 and described
4th port 540 is connected.By it is above-mentioned with four-way valve 500 when control means and step, enable to pass through four-way valve
500 switching control makes air-conditioning system reach the purpose and effect of heating or refrigeration, to meet user or actual conditions
Needs.
Above-mentioned air-conditioning system, including compressor set, outdoor heat exchanger, throttling set and indoor heat exchanger.The compression
Unit, the outdoor heat exchanger, the throttling set and the indoor heat exchanger form circulation loop.The compressor set includes
At least two compressor branches parallel with one another are provided at least one compressor on compressor branch road described in each,
Wherein the total displacement of the compressor of any two compressor branch road is different.According to required refrigeration or the size of heating load
The compressor branches that difference chooses different compressor displacement are connected, and be in Smaller load, middle load with environment indoors and are greatly born
The compressor branch of associated compressors discharge capacity is opened under lotus demand, to meet the refrigeration of indoor environment different load or the reality of heating
Border demand reaches the target temperature and refrigeration or heating capacity demand of user.Such as when air-conditioning system is in underrun, open
The compressor branch of small displacement is run, and closes the compressor branch of huge discharge, so that air-conditioning system meets interior with lower power consumption
The heating or refrigeration demand of environment, the unit output that may be implemented under underload is smaller, and room temperature fluctuation is smaller, and comfort is more
Height efficiently reduces power consumption, saves the energy, improves the efficiency of air-conditioning system；And when air-conditioning system is in heavy-duty service
When, while the compressor branch operation of the compressor branch and small displacement of huge discharge is opened, to meet indoor environment high load capacity
The actual demand of refrigeration or heating.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of air-conditioning system, which is characterized in that including compressor set (100), outdoor heat exchanger (200), throttling set (300)
And indoor heat exchanger (400):
The compressor set (100), the outdoor heat exchanger (200), the throttling set (300) and the indoor heat exchanger
(400) circulation loop is formed；
The compressor set (100) includes at least two compressor branches parallel with one another, compressor branch described in each
On be provided at least one compressor, wherein the total displacement of the compressor of any two compressor branch road is different.
2. air-conditioning system according to claim 1, which is characterized in that the compressor branch includes parallel with one another first
Compressor branch (110) and the second compressor branch (120) are provided with the first compression on the first compressor branch (110)
Machine (111) is provided with the second compressor (121) on the second compressor branch (120), first compressor (111)
Discharge capacity is greater than the discharge capacity of second compressor (121).
3. air-conditioning system according to claim 2, which is characterized in that first compressor (111) is scroll compressor
Machine, second compressor (121) are rotor-type compressor.
4. air-conditioning system according to claim 2, which is characterized in that be arranged on the first compressor branch (110)
There is the first control valve for controlling its on-off, is provided on the second compressor branch (120) for controlling its on-off
The second control valve.
5. air-conditioning system according to claim 4, which is characterized in that first control valve and second control valve are equal
For solenoid valve.
6. air-conditioning system as claimed in any of claims 1 to 5, which is characterized in that it further include four-way valve (500),
The first port (510) of the four-way valve (500) is connected to the exhaust outlet of the compressor set (100), the four-way valve (500)
Second port (520) be connected to the outdoor heat exchanger (200), the third port (530) of the four-way valve (500) with it is described
The air inlet of compressor set (100) is connected to, the 4th port (540) and the indoor heat exchanger (400) of the four-way valve (500)
Connection, wherein
The first port (510) of the four-way valve (500) is connected to the second port (520) of the four-way valve (500), and described four
The third port (530) of port valve (500) is connected to the 4th port (540) of the four-way valve (500)；
Alternatively,
The first port (510) of the four-way valve (500) is connected to the 4th port (540) of the four-way valve (500), and described four
The second port (520) of port valve (500) is connected to the third port (530) of the four-way valve (500).
7. air-conditioning system according to claim 6, which is characterized in that further include gas-liquid separator (600), the gas-liquid point
It is set between the four-way valve (500) and the air inlet of the compressor set (100) from device (600).
8. air-conditioning system according to claim 1, which is characterized in that the throttling set (300) be heating power expansion valve or
Electric expansion valve.
9. air-conditioning system according to claim 3, which is characterized in that the scroll compressor is constant speed compressor, number
Code compressor or variable speed compressor.
10. air-conditioning system according to claim 3, which is characterized in that the rotor-type compressor is stator formula rotator type
Compressor or sliding rotary formula compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920030737.6U CN209326132U (en) | 2019-01-07 | 2019-01-07 | Air-conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920030737.6U CN209326132U (en) | 2019-01-07 | 2019-01-07 | Air-conditioning system |
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| Publication Number | Publication Date |
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| CN209326132U true CN209326132U (en) | 2019-08-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631387A (en) * | 2019-01-07 | 2019-04-16 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method |
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2019
- 2019-01-07 CN CN201920030737.6U patent/CN209326132U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631387A (en) * | 2019-01-07 | 2019-04-16 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method |
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