CN103375937A - Multi-connected air conditioning system and control method thereof - Google Patents

Multi-connected air conditioning system and control method thereof Download PDF

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Publication number
CN103375937A
CN103375937A CN2012101071452A CN201210107145A CN103375937A CN 103375937 A CN103375937 A CN 103375937A CN 2012101071452 A CN2012101071452 A CN 2012101071452A CN 201210107145 A CN201210107145 A CN 201210107145A CN 103375937 A CN103375937 A CN 103375937A
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heat exchanger
outdoor heat
pressure
work
control
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CN103375937B (en
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黄春
李绍斌
宋培刚
曹勇
胡朝发
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Zhuhai Gree Electrical and Mechanical Engineering Co Ltd
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Gree Electric Appliances Inc of Zhuhai
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Abstract

The invention discloses a multi-connected air conditioning system and a control method thereof. The multi-connected air conditioning system comprises a compressor (7), an indoor heat exchanger (9), a four-way valve (8), a first outdoor heat exchanger (1), a second outdoor heat exchanger (2), a pressure detecting device (6) and a main control board (5). The pressure detecting device (6) is used for detecting system pressure of the multi-connected air conditioning system. The main control board (5) is connected with the pressure detecting device (6) and used for controlling the first outdoor heat exchanger (1) and/or the second outdoor heat exchanger (2) to operate according to the system pressure. By the multi-connected air conditioning system, single or two outdoor heat exchangers can be controlled to operate according to the system pressure, appropriate system heat exchange amount can be kept to allow the system to keep appropriate pressure, control capability of system pressure difference is increased, and stability of system operation is increased.

Description

Multi-gang air conditioner and control method thereof
Technical field
The present invention relates to field of air conditioning, in particular to a kind of multi-gang air conditioner and control method thereof.
Background technology
In the water source multi-gang air conditioner, cold-producing medium in outdoor unit heat exchanger mainly by carrying out exchange heat with water, to reach condensation or the effect of evaporation.The quality of the affects system heat exchange of outdoor unit heat exchanger.
The multi-gang air conditioner unit is in the process of actual motion, the heat exchange demand of outdoor condenser is to change with the difference of opening the indoor set number, when refrigerant flow changes, if keep constant size exchange capability of heat might be so that the insufficient or undue condensation of condensation of refrigerant, so that the force value of system can not remain in the suitable scope, when higher or low pressure is on the low side when the high pressure of system, then may so that the height pressure reduction of system increase, the increased power that causes unit increases user's power consumption indirectly; When on the low side or low pressure is higher when system high pressure, then be easy to reduce the height pressure reduction of system so that the flow velocity of cold-producing medium in system slow down, underfed, cause that the unit refrigerating capacity is not enough, oil return is difficult and cross valve can not normal commutation etc. problem.
Problem for system pressure difference control weak effect in the multi-joint system in the correlation technique not yet proposes effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of multi-gang air conditioner and control method thereof, to solve the problem of system pressure difference control weak effect in the multi-joint system.
To achieve these goals, according to an aspect of the present invention, provide a kind of multi-gang air conditioner.
Multi-gang air conditioner according to the present invention comprises: compressor; Indoor heat exchanger; Cross valve, first end is connected with the first end of compressor, and the second end of cross valve is connected with the second end of compressor, and the 3rd end of cross valve is connected with the first end of indoor heat exchanger; The first outdoor heat exchanger, first end is connected with the 4th end of cross valve, and the second end is connected with the second end of indoor heat exchanger; The second outdoor heat exchanger, in parallel with the first outdoor heat exchanger; Pressure-detecting device is for detection of the system pressure of multi-gang air conditioner; And the control mainboard, be connected with pressure-detecting device, be used for controlling the first outdoor heat exchanger and/or the second outdoor heat exchanger work according to system pressure.
Further, this system also comprises: the first valve, be positioned on the pipeline of the first outdoor heat exchanger, and be connected with the control mainboard; And second valve, be positioned on the pipeline of the second outdoor heat exchanger, be connected with the control mainboard, wherein, the control mainboard is used for controlling the first valve and the second valve according to system pressure, so that the first outdoor heat exchanger and/or the second outdoor heat exchanger work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger.
Further, pressure-detecting device is for detection of the pressure of close cross valve one end of the first outdoor heat exchanger and the second outdoor heat exchanger.
To achieve these goals, according to a further aspect in the invention, provide a kind of control method of multi-gang air conditioner.
Control method according to multi-gang air conditioner of the present invention comprises: the system pressure P that detects multi-gang air conditioner; And according to the magnitude relationship of system pressure P and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work, wherein, this multi-gang air conditioner is any one multi-gang air conditioner provided by the invention.
Further, when multi-gang air conditioner freezed, the predetermined system limiting pressure comprised predetermined system high pressure limit pressure P The system high pressure upper limitWith predetermined system high pressure threshold pression P The system high pressure lower limit, wherein, according to the magnitude relationship of system pressure and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work comprises: as P>P On the system high pressure LimitThe time, control the first outdoor heat exchanger and the second outdoor heat exchanger is worked simultaneously; And as P<P The system high pressure lower limitThe time, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work, or control the second outdoor heat exchanger work and the first outdoor heat exchanger quits work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger, P The system high pressure lower limitComprise P Be 1 under the system high pressureAnd P System high pressure lower limit 2, and P System high pressure lower limit 1>P System high pressure lower limit 2, wherein, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work, or control the second outdoor heat exchanger work and the first outdoor heat exchanger and quit work and comprise: work as P System high pressure lower limit 2≤ P<P System high pressure lower limit 1The time, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work; And as P<P System high pressure lower limit 2The time, control that the first outdoor heat exchanger quits work and the second outdoor heat exchanger work.
Further, when multi-gang air conditioner heated, the predetermined system limiting pressure comprised predetermined system low pressure upper limit pressure P The system low-voltage upper limitWith predetermined system low pressure threshold pression P The system low-voltage lower limit, wherein, according to the magnitude relationship of system pressure and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work comprises: as P<P Under the system low-voltage LimitThe time, control the first outdoor heat exchanger and the second outdoor heat exchanger is worked simultaneously; And as P>P The system low-voltage upper limitThe time, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work, or control the second outdoor heat exchanger work and the first outdoor heat exchanger quits work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger, P The system low-voltage upper limitComprise P The system low-voltage upper limit 1And P The system low-voltage upper limit 2, and P The system low-voltage upper limit 1<P The system low-voltage upper limit 2, wherein, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work, or control the second outdoor heat exchanger work and the first outdoor heat exchanger and quit work and comprise: work as P The system low-voltage upper limit 2〉=P>P The system low-voltage upper limit 1The time, control the first outdoor heat exchanger work and the second outdoor heat exchanger and quit work; And as P>P The system low-voltage upper limit 2The time, control that the first outdoor heat exchanger quits work and the second outdoor heat exchanger work.
Further, the system pressure that detects multi-gang air conditioner comprises: take Preset Time as the interval, detect the system pressure of multi-gang air conditioner.
By the present invention, adopt the multi-gang air conditioner that comprises following part: compressor; Indoor heat exchanger; Cross valve; Two outdoor heat exchangers parallel with one another; Pressure-detecting device for detection of the system pressure of multi-gang air conditioner; And the control mainboard that is connected with pressure-detecting device, this control mainboard can be according to single or two outdoor heat exchanger work of size control of system pressure, thereby can the suitable heat exchange amount of keeping system, so that system keeps suitable pressure, solved the problem of system pressure difference control weak effect in the multi-joint system, and then reached raising system pressure difference control ability, increase the effect of system run all right.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the multi-gang air conditioner of the embodiment of the invention;
Fig. 2 is the flow chart according to the multi-gang air conditioner control method of first embodiment of the invention;
Fig. 3 is the flow chart according to the multi-gang air conditioner control method of second embodiment of the invention; And
Fig. 4 is the flow chart according to the multi-gang air conditioner control method of third embodiment of the invention.
The specific embodiment
Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is the schematic diagram according to the multi-gang air conditioner of the embodiment of the invention, as shown in Figure 1, this multi-gang air conditioner comprises: the first outdoor heat exchanger 1, the second outdoor heat exchanger 2, the first valve 3, the second valve 4, control mainboard 5, pressure-detecting device 6, compressor 7, cross valve 8, indoor heat exchanger 9, temperature sensor 10, choke valve 11 and gas-liquid separator 12.
Wherein, the first outdoor heat exchanger 1 is in parallel with the second outdoor heat exchanger 2, and the A end is water inlet, and the B end is delivery port, an end is connected to an end of indoor heat exchanger 9 through cross valve 8 after in parallel, and the other end after the parallel connection is connected through the other end of choke valve 11 with indoor heat exchanger 9; Other two ends of cross valve 8 are connected with the exhaust end of compressor 7 and the suction end of gas-liquid separator 12 respectively, and gas-liquid separator 12 places between compressor 7 and the cross valve 8; The first valve 3 is positioned on the pipeline of the first outdoor heat exchanger 1, and the second valve 4 is positioned on the pipeline of the second outdoor heat exchanger 2; Control mainboard 5 is connected respectively with choke valve 11 with the first valve 3, the second valve 4, pressure-detecting device 6, temperature sensor 10.
Pressure-detecting device 6 is for detection of the system pressure of multi-gang air conditioner, the system pressure that control mainboard 5 bases detect is controlled the first valve 3 and the second valve 4, the exhaust end of compressor 7 is system high pressure, compressor 7 suction ends are system low-voltage, when higher or low pressure is on the low side at system high pressure, control the first valve 3 and the second valve 4 is all opened, so that the first outdoor heat exchanger 1 and the second outdoor heat exchanger 2 are worked simultaneously, reduce height pressure reduction, and then reduce the power of the assembling unit, save electric energy; When on the low side or low pressure is higher at system high pressure; controlling the first valve 3 opens; the second valve 4 is closed, so that the first outdoor heat exchanger 1 works independently, perhaps controls the second valve 4 and opens; the first valve 3 is closed; so that the second outdoor heat exchanger 2 works independently, with the height pressure reduction of elevation system, so that cold-producing medium flow velocity in system speeds; guarantee sufficient refrigerating capacity, thereby make cross valve 8 normal commutation.
In this embodiment, open or close control room external heat exchanger work by by-pass valve control, also can adopt other control mode control heat exchanger start and stop.
The multi-gang air conditioner that adopts this embodiment to provide, at outdoor two heat exchangers that parallel connection is set, and by pressure-detecting device real-time detecting system pressure, the control mainboard also is the size of multi-gang air conditioner inner refrigerant flow according to system pressure, and two outdoor heat exchangers are carried out suitable selection, controlling two heat exchangers works simultaneously or works independently, in order to the suitable heat exchange amount of keeping system, so that system can keep suitable pressure, increase the stability of air-conditioning system operation.
For further control system pressure in suitable scope, preferably, the heat exchange amount of the first outdoor heat exchanger 1 is greater than the heat exchange amount of the second outdoor heat exchanger 2, higher when larger in system high pressure large or low pressure on the low side, control 1 work of the first outdoor heat exchanger, higher hour in system high pressure less or low pressure on the low side, control 2 work of the second outdoor heat exchanger.
For accurate control system pressure, preferably, pressure-detecting device 6 is arranged near two heat exchangers, for detection of the inlet pressure of the first outdoor heat exchanger 1 and the second outdoor heat exchanger 2.
Fig. 2 is the flow chart according to the multi-gang air conditioner control method of first embodiment of the invention, as shown in Figure 2, this multi-gang air conditioner is any one multi-gang air conditioner in this specific embodiment, wherein, the outdoor heat exchanger of this multi-gang air conditioner comprises two heat exchangers in parallel, and this control method comprises following step S102 and step S104.
Step S102: the system pressure P that detects multi-gang air conditioner.
Step S104: according to the magnitude relationship of system pressure P and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work.
Adopt the control method of the multi-gang air conditioner that this embodiment provides, real-time detecting system pressure, according to the system pressure that detects, it also is the size of multi-gang air conditioner inner refrigerant flow, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work, in order to the suitable heat exchange amount of keeping system, so that system keeps suitable pressure, increase the stability of air-conditioning system operation.
Fig. 3 is the flow chart according to the multi-gang air conditioner control method of second embodiment of the invention, in this multi-gang air conditioner, off-premises station has two heat exchangers that the heat exchange amount is different, simultaneously be provided with magnetic valve at two heat exchange manifolds, near two heat exchangers, be provided with pressure sensor, and in the control mainboard, be preset with P System high pressure lower limit 1, P System high pressure Lower limit 2, P The system high pressure upper limit, and P System high pressure lower limit 2<P System high pressure lower limit 1<P The system high pressure upper limit
As shown in Figure 3, when the unit refrigerating operaton, the detected pressure of pressure sensor is the high-voltage value of system, after refrigeration start, the high-voltage value P1 of the every 40s detection system of control mainboard, and with default P System high pressure lower limit 1, P Under the system high pressure Limit 2, P The system high pressure upper limitCompare:
As the pressure value P 1>P that detects The system high pressure upper limitThe time, then two magnetic valves are all opened, and allow two heat exchangers all participate in heat exchange, promote the heat exchange amount, reduce system high pressure to desired value;
Work as P The system high pressure upper limit〉=P1 〉=P System high pressure lower limit 1The time, then magnetic valve is kept current state;
Work as P System high pressure lower limit 2≤ P1<P System high pressure lower limit 1The time, then open the larger magnetic valve of heat exchanger, close the less magnetic valve of heat exchanger, larger heat exchanger participates in heat exchange, reduces the heat exchange amount, and the elevator system high pressure is to desired value;
As P1<P System high pressure lower limit 2The time, then close the larger magnetic valve of heat exchanger, open the less magnetic valve of heat exchanger, less heat exchanger participates in heat exchange.
Wherein, after changing the state of magnetic valve, continue the force value of the import of sensing chamber's external heat exchanger, and keep the magnetic valve state or again change the magnetic valve state according to the force value that detects, thus, the final so that high-voltage value of system remains in the suitable scope.
Fig. 4 is the flow chart according to the multi-gang air conditioner control method of third embodiment of the invention, in this multi-gang air conditioner, off-premises station has two heat exchangers that the heat exchange amount is different, near two heat exchangers, be provided with pressure sensor, simultaneously be provided with magnetic valve at two heat exchange manifolds, and in the control mainboard, be preset with P The system low-voltage lower limit, P The system low-voltage upper limit 1, P The system low-voltage upper limit 2, and P The system low-voltage lower limit<P The system low-voltage upper limit 1<P The system low-voltage upper limit 2
As shown in Figure 4, when the unit heating operation, the detected pressure of pressure sensor is the low voltage value of system, after heating start, the low voltage value P2 of control mainboard every 40s detection system, and with default P The system low-voltage lower limit, P The system low-voltage upper limit 1, P The system low-voltage upper limit 2Compare:
As the pressure value P 2<P that detects The system low-voltage lower limitThe time, then two magnetic valves are all opened, and allow two heat exchangers participate in heat exchange, promote the heat exchange amount, so that the low pressure of system is increased to desired value;
Work as P The system low-voltage upper limit 1〉=P2 〉=P The system low-voltage lower limitThe time, then magnetic valve is kept current state;
Work as P The system low-voltage upper limit 2〉=P2>P The system low-voltage upper limit 1The time, illustrate that condenser inner refrigerant and water heat exchange are sufficient, then close the less magnetic valve of heat exchanger;
As P2>P The system low-voltage upper limit 2The time, then close the larger magnetic valve of heat exchanger, only allow less heat exchanger participate in heat exchange, reduce the heat exchange amount, reduce low pressure to desired value.
Wherein, after changing the state of magnetic valve, continue the force value of the import of sensing chamber's external heat exchanger, and keep the magnetic valve state or again change the magnetic valve state according to the force value that detects, thus, the final so that low voltage value of system remains in the suitable scope.
From above description, can find out, the present invention has realized following technique effect: at outdoor two heat exchangers that parallel connection is set, the control mainboard carries out suitable selection according to system pressure to two outdoor heat exchangers, controlling two heat exchangers works simultaneously or works independently, thereby the heat exchange amount that keeping system is suitable so that system can keep suitable pressure, increases the stability of air-conditioning system operation.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. multi-gang air conditioner comprises:
Compressor (7);
Indoor heat exchanger (9);
Cross valve (8), first end is connected with the first end of described compressor (7), the second end of described cross valve (8) is connected with the second end of described compressor (7), and the 3rd end of described cross valve (8) is connected with the first end of described indoor heat exchanger (9);
It is characterized in that, also comprise:
The first outdoor heat exchanger (1), first end is connected with the 4th end of described cross valve (8), and the second end is connected with the second end of described indoor heat exchanger (9);
The second outdoor heat exchanger (2), in parallel with described the first outdoor heat exchanger (1);
Pressure-detecting device (6) is for detection of the system pressure of described multi-gang air conditioner; And
Control mainboard (5) is connected with described pressure-detecting device (6), is used for controlling described the first outdoor heat exchanger (1) and/or described the second outdoor heat exchanger (2) work according to described system pressure.
2. multi-gang air conditioner according to claim 1 is characterized in that, also comprises:
The first valve (3) is positioned on the pipeline of described the first outdoor heat exchanger (1), is connected with described control mainboard (5); And
The second valve (4) is positioned on the pipeline of described the second outdoor heat exchanger (2), is connected with described control mainboard (5),
Wherein, described control mainboard (5) is used for controlling described the first valve (3) and described the second valve (4) according to described system pressure, so that described the first outdoor heat exchanger (1) and/or described the second outdoor heat exchanger (2) work.
3. multi-gang air conditioner according to claim 1 and 2 is characterized in that, the heat exchange amount of described the first outdoor heat exchanger (1) is greater than the heat exchange amount of described the second outdoor heat exchanger (2).
4. multi-gang air conditioner according to claim 1 and 2, it is characterized in that described pressure-detecting device (6) is for detection of the pressure of close described cross valve (8) one ends of described the first outdoor heat exchanger (1) and described the second outdoor heat exchanger (2).
5. the control method of a multi-gang air conditioner is characterized in that, described multi-gang air conditioner is multi-gang air conditioner claimed in claim 1, and described control method comprises:
Detect the system pressure P of described multi-gang air conditioner; And
According to the magnitude relationship of described system pressure P and predetermined system limiting pressure, control the work of described the first outdoor heat exchanger (1) and/or described the second outdoor heat exchanger (2).
6. control method according to claim 5 is characterized in that, when described multi-gang air conditioner refrigeration, described predetermined system limiting pressure comprises predetermined system high pressure limit pressure P The system high pressure upper limitWith predetermined system high pressure threshold pression P The system high pressure lower limit, wherein, according to the magnitude relationship of described system pressure and predetermined system limiting pressure, described the first outdoor heat exchanger (1) and/or described the second outdoor heat exchanger (2) work of controlling comprises:
As P>P The system high pressure upper limitThe time, control described the first outdoor heat exchanger (1) and described the second outdoor heat exchanger (2) is worked simultaneously; And
As P<P The system high pressure lower limitThe time, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work, or control described the second outdoor heat exchanger (2) work and described the first outdoor heat exchanger (1) quits work.
7. control method according to claim 6 is characterized in that, the heat exchange amount of described the first outdoor heat exchanger (1) is greater than the heat exchange amount of described the second outdoor heat exchanger (2), described P The system high pressure lower limitComprise P System high pressure lower limit 1And P System High pressure lower limit 2, and P System high pressure lower limit 1>P System high pressure lower limit 2, wherein, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work, or control described the second outdoor heat exchanger (2) work and described the first outdoor heat exchanger (1) and quit work and comprise:
Work as P System high pressure lower limit 2≤ P<P High system depresses limit 1The time, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work; And
As P<P System high pressure lower limit 2The time, control that described the first outdoor heat exchanger (1) quits work and described the second outdoor heat exchanger (2) work.
8. control method according to claim 5 is characterized in that, when described multi-gang air conditioner heated, described predetermined system limiting pressure comprised predetermined system low pressure upper limit pressure P The system low-voltage upper limitWith predetermined system low pressure threshold pression P The system low-voltage lower limit, wherein, according to the magnitude relationship of described system pressure and predetermined system limiting pressure, control described the first outdoor heat exchanger and/or described the second outdoor heat exchanger work comprises:
As P<P The system low-voltage lower limitThe time, control described the first outdoor heat exchanger (1) and described the second outdoor heat exchanger (2) is worked simultaneously; And
As P>P The system low-voltage upper limitThe time, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work, or control described the second outdoor heat exchanger (2) work and described the first outdoor heat exchanger (1) quits work.
9. control method according to claim 8 is characterized in that, the heat exchange amount of described the first outdoor heat exchanger (1) is greater than the heat exchange amount of described the second outdoor heat exchanger (2), described P The system low-voltage upper limitComprise P The system low-voltage upper limit 1And P System The low pressure upper limit 2, and P The system low-voltage upper limit 1<P The system low-voltage upper limit 2, wherein, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work, or control described the second outdoor heat exchanger (2) work and described the first outdoor heat exchanger (1) and quit work and comprise:
Work as P The system low-voltage upper limit 2〉=P>P The system low-voltage upper limit 1The time, control described the first outdoor heat exchanger (1) work and described the second outdoor heat exchanger (2) and quit work; And
As P>P The system low-voltage upper limit 2The time, control that described the first outdoor heat exchanger (1) quits work and described the second outdoor heat exchanger (2) work.
10. each described control method in 9 according to claim 5 is characterized in that the system pressure that detects described multi-gang air conditioner comprises:
Take Preset Time as the interval, detect the system pressure of described multi-gang air conditioner.
CN201210107145.2A 2012-04-12 2012-04-12 Multi-gang air conditioner and control method thereof Active CN103375937B (en)

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CN104748424A (en) * 2015-03-31 2015-07-01 广东美的暖通设备有限公司 Outdoor unit assembly of multiple on-line system and multiple on-line system with same
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CN104748425A (en) * 2015-03-31 2015-07-01 广东美的暖通设备有限公司 Outdoor unit assembly of multiple on-line system and multiple on-line system
CN104748425B (en) * 2015-03-31 2017-03-08 广东美的暖通设备有限公司 The off-premises station assembly of multiple on-line system and multiple on-line system
CN104748424B (en) * 2015-03-31 2017-06-06 广东美的暖通设备有限公司 The outdoor unit component and the multiple on-line system with it of multiple on-line system
CN111426106A (en) * 2020-05-11 2020-07-17 珠海格力电器股份有限公司 Cold water air conditioner, cooling water unit thereof and cooling water control method

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