CN110006136A - A kind of heat pump air conditioner unit and energy-saving control method - Google Patents
A kind of heat pump air conditioner unit and energy-saving control method Download PDFInfo
- Publication number
- CN110006136A CN110006136A CN201811287509.3A CN201811287509A CN110006136A CN 110006136 A CN110006136 A CN 110006136A CN 201811287509 A CN201811287509 A CN 201811287509A CN 110006136 A CN110006136 A CN 110006136A
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- China
- Prior art keywords
- heat pump
- central controller
- indoor fan
- fan coil
- unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F24F11/46—Improving electric energy efficiency or saving
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
-
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a kind of energy-saving heat pump air-conditioner set and energy-saving control methods, it include more outdoor heat pump units, heat pump branch pipe(tube) motor-driven valve, insulated water tank, unit water frequency variable circulating pump, user's water frequency variable circulating pump, heat pump central controller, multiple groups indoor fan coil pipe and multiple groups indoor fan coil pipe controller including heat pump air conditioner unit, heat pump central controller and indoor fan coil pipe controller have WiFi wireless communication function；Heat pump central controller can be realized using WiFi communication technology and the indoor fan coil pipe controller communication, constitutes the heating control system of a set of closed loop, realizes the on-demand regulation to heating system heat source.
Description
Technical field
The present invention relates to a kind of heat pump air conditioners, and in particular to a kind of heat pump air conditioner unit and energy-saving control method.
Background technique
With the rapid development of national economy, air conditioner plays huge effect in people's modern life, but
Huge problems of energy consumption is also brought while building comfortable living and working environment for people.From various countries, survey data can
To find out, in developed country, building energy consumption accounts for about the 30%~40% of total energy consumption, and China's building energy consumption accounts for the 12% of world's total energy consumption
Left and right.Air-conditioning energy consumption accounts for very big specific gravity in building energy consumption, and general air-conditioning energy consumption accounts for the 50% of whole building energy consumption
More than.Energy saving to greatest extent it can become an important topic again under the premise of meeting people's maximal comfort.
Summary of the invention
The present invention relates to a kind of energy-saving heat pump air-conditioner set and control methods, and wherein heat pump air conditioner unit includes the room Duo Tai
Outer heat pump unit, heat pump branch pipe(tube) motor-driven valve, insulated water tank, the unit water frequency variable circulating pump, user to match with heat pump quantity
Water frequency variable circulating pump, heat pump central controller, multiple groups indoor fan coil pipe and multiple groups indoor fan coil pipe controller.
Heat pump air conditioner unit includes cooling/heating recycle loop water flow flowing mode: insulated water tank → outdoor heat pump unit
→ heat pump branch pipe(tube) motor-driven valve → unit water frequency variable circulating pump → insulated water tank forms cooling/heating circulation loop；Wherein recirculated water
It is recycled by the frequency variable circulating pump, unit water frequency variable circulating pump receives the control signal of heat pump central controller, and according to signal
Change running frequency, frequency more low power consumption is fewer to reach energy-saving effect.
Heat pump air conditioner unit includes user's recycle loop water flow flowing mode: insulated water tank → user's water frequency conversion circulation
Pump → indoor fan coil pipe → insulated water tank forms user's circulation loop；Wherein recirculated water is by user's water frequency variable circulating pump
It is recycled, user's water frequency variable circulating pump receives the control signal of heat pump central controller, and indoor fan is controlled by indoor fan coil pipe
Device control, and running frequency is changed according to signal, frequency more low power consumption is fewer to reach energy-saving effect.
Heat pump air conditioner unit, it is characterised in that have heat-exchanger rig for refrigerant inside heat pump unit inside outdoor heat pump unit
With the heat exchange of user's circulation loop.Cooling/heating circulation loop and user's circulation loop share the same insulated water tank and circulation
Water.Liquid level sensor is provided in insulated water tank, liquid level information is fed back to heat pump central controller by heat pump collection control by liquid level sensor
Device starts water supply solenoid valve unlatching in water level deficiency and carries out circulation water level supplement.
Air-conditioner set is pumped, wherein heat pump central controller and indoor fan coil pipe controller can be used for wireless communication function
It is communicated between equipment, it can also be used to which wireless network communication includes WIFI communication, bluetooth communication.
Heat pump central controller and indoor fan coil pipe controller have WiFi wireless communication function, the heat pump central controller control
The outdoor heat pump unit, the heat pump branch pipe(tube) motor-driven valve, the unit water frequency variable circulating pump, user's water frequency conversion circulation
Pump and the indoor fan coil pipe controller implement function such as:
The heat pump central controller detects the set temperature and the insulated water tank temperature of the multiple groups indoor fan coil pipe controller
Difference controls the outdoor heat pump unit start and stop quantity according to described two temperature gaps.
Heat pump central controller detects control user's water frequency conversion circulation when the indoor fan coil pipe controller operation quantity increases
The frequency upgrading of pump.
Heat pump central controller detects the frequency that unit water frequency variable circulating pump is controlled when the outdoor heat pump unit operation quantity increases
Rate is promoted.
All outdoor heat pump units of heat pump central controller detection, the control pair when some or several outdoor heat pump units are closed
The heat pump branch pipe(tube) motor-driven valve answered is closed.
The heat pump branch pipe(tube) motor-driven valve to match with heat pump quantity is used in series with outdoor heat pump unit, when heat pump central controller
Control room outer heat pump unit simultaneously closes off corresponding heat pump branch pipe(tube) motor-driven valve and stops water circulation to terminate this all the way when shutting down
The heat exchange of outdoor heat pump unit reduces thermal loss and saves electric energy.
Heat pump central controller can pass through the temperature of the collected locality in internet, weather, the wind-force parameter regulation control machine
The running frequency of group water frequency variable circulating pump running frequency and user's water frequency variable circulating pump.
Heat pump air conditioner unit, wherein the heat pump central controller can be realized and the indoor fan disk using WiFi communication technology
Tube controller communication, constitutes the heating control system of a set of closed loop, realizes the on-demand regulation to heating system heat source.To reach
The technical effect of dynamic energy-saving is arrived.
Heat pump air conditioner unit, wherein heat pump central controller can be accessed type controller each in system by WiFi communication technology
Outdoor temperature, indoor temperature, the indoor fan coil pipe operating condition, the outdoor heat pump unit are run feelings by Internet
Condition data are uploaded to remote server, can the adjusting situation of real time inspection room temperature and the operating condition of each equipment, realize
Long-range monitoring to system, effectively increases monitoring and maintenance efficiency.
Heat pump central controller, wherein passing through 12Pin by core control mainboard, serial communication mainboard, DI interface board, DO interface board
Parallel busses connect and compose, and the 12Pin parallel busses take line, 1 enabled control line by 8 data lines, the multiplexing of 3 root functionalities
It constitutes.
Heat pump central controller, the wherein host equipment of 12Pin parallel busses, other are slave devices.
Heat pump central controller, wherein the parallel port communication of serial communication mainboard and DI interface board and DO interface board enables triggering level
On the contrary, 3 root functionality multiplexing lines are respectively clock cable, read-write mark when serial communication mainboard Parallel Interface Communication is enabled and triggers
Will signal wire, slave answer signal line, when DI interface board and DO interface board parallel port communication are enabled when triggering, 3 root functionalities are multiplexed
Line is address code line.
The electric energy in water cycle process is saved by above-mentioned Energy Saving Control, according to the usage amount distribution according to need energy.Wherein
Flow including two variable frequency pumps is adjusted, unit run quantity number, the high low adjustment of insulated water tank temperature realizes dynamic
, orderly adjusting uses temperature and operation of heat pump electric energy, and combines local weather conditions, the comprehensive adjustments such as environment temperature, number
Long-range control and monitoring are realized with internet communication in real time according to control and feedback, reaches energy-efficient purpose.
Detailed description of the invention
Fig. 1 is a kind of energy-saving heat pump air conditioner control mode schematic diagram.
Fig. 2 is that a kind of energy-saving heat pump air-conditioner set water recycles schematic diagram.
Specific embodiment
Embodiment:
Heat pump air conditioner unit, wherein insulated water tank → user's water frequency variable circulating pump → indoor fan coil pipe → insulated water tank；Wherein
Recirculated water is recycled by user's water frequency variable circulating pump, and user's water frequency variable circulating pump is controlled tuning range by heat pump central controller and is
5Hz to 50Hz range, user's water frequency variable circulating pump receive the control signal of heat pump central controller, and indoor fan is by indoor fan coil pipe
Controller controls adjustable wind speed to adjust room temperature and air quantity.
Cooling/heating circulation loop is insulated water tank → outdoor heat pump unit → heat pump branch pipe(tube) motor-driven valve → unit water frequency conversion
Circulating pump → insulated water tank, wherein recirculated water is recycled by the frequency variable circulating pump is controlled tuning range by heat pump central controller and is
5Hz to 50Hz range, unit water frequency variable circulating pump receive the control Signal Regulation running frequency of heat pump central controller.
Cooling/heating circulation loop and user's circulation loop share the same insulated water tank and recirculated water, and insulated water tank has
Static pressure liquid level sensor simultaneously there is supplement recirculated water when water supply solenoid valve water level deficiency keep constant water level.
Indoor fan coil pipe is copper pipe fan type indoor radiating air-conditioning, and when user's water is recycled to fan coil, blower starts
Gas carries out heat exchange by heat exchange coil to adjust room temperature.
The cooling in summer course of work: fan coil controller set temperature, the receiving of heat pump central controller come from user indoors
The WiFi communication signal of indoor fan coil pipe controller, control system enter refrigeration work mode, outside central controller controls room
Heat pump unit makes the coolant-temperature gage in insulated water tank be reduced to 10 DEG C by heat exchange, this temperature can by heat pump central controller according to
The temperature difference of number of users and environment temperature and set temperature automatically adjusts, and the water of low temperature passes through user's water frequency variable circulating pump in water tank
It is circulated between insulated water tank and indoor fan coil pipe, the water of the low temperature flowed in the coil pipe of fan coil indoors makes it
The air cooling-down of surrounding, is blown into interior for the air of low temperature by blower.
The heat supply in winter course of work: fan coil controller set temperature, the receiving of heat pump central controller come from user indoors
The WiFi communication signal of indoor fan coil pipe controller, control system enter refrigeration work mode, outside central controller controls room
Heat pump unit makes the coolant-temperature gage in insulated water tank be promoted to 55 DEG C by heat exchange, this temperature can by heat pump central controller according to
The temperature difference of number of users and environment temperature and set temperature automatically adjusts, and the water of high temperature passes through user's water frequency variable circulating pump in water tank
It is circulated between insulated water tank and indoor fan coil pipe, the water of the high temperature flowed in the coil pipe of fan coil indoors makes it
The atmosphere temperature rising of surrounding, is blown into interior for the air of high temperature by blower.
Heat pump air conditioner unit has inside outdoor heat pump unit heat-exchanger rig for refrigerant inside heat pump unit and cooling/heating
The heat exchange of circulation loop, heat-exchanger rig are coil-type heat exchanger.
Wherein heat pump air conditioner unit, wherein heat pump central controller and indoor fan coil pipe controller have wireless communication function.
Heat pump central controller detects the set temperature and the insulated water tank temperature of the multiple groups indoor fan coil pipe controller, according to described
Two temperature difference control the outdoor heat pump unit start and stop quantity, and unit water frequency variable circulating pump running frequency and user's water frequency conversion follow
The running frequency of ring pump.
The heat pump branch pipe(tube) motor-driven valve to match with heat pump quantity is used in series with the outdoor heat pump unit, when heat pump collection
Control device detect user's water-flow circuit flow tail off the return water temperature temperature difference become smaller to control user's recirculated water frequency conversion reduce frequency
Rate, and the outer heat pump unit of close portion locellus, corresponding heat pump branch pipe(tube) motor-driven valve is closed at the same time, reduces recirculated water by not
The outdoor heat pump machine heat exchange coil of operation reaches power saving purpose to reduce thermal loss.
Heat pump central controller can pass through the temperature of the collected locality in internet, weather, the wind-force parameter regulation control machine
The running frequency of group water frequency variable circulating pump running frequency and user's water frequency variable circulating pump, such as the outdoor temperature difference and indoor user are set
Temperature spread is greater than 5 DEG C and is then all turned on outdoor heat pump quantity and two circulating pumps of capacity operation.
Heat pump central controller can be realized using WiFi communication technology and the indoor fan coil pipe controller communication, constitutes a set of
The heating control system of closed loop realizes the on-demand regulation to heating system heat source, when indoor environment temperature is far below setting temperature
The degree temperature difference is greater than 10 DEG C or indoor user increases, and heat pump central controller controls user's water frequency variable circulating pump and frequency is turned up, and simultaneously
Starting all outdoor heat pump unit operations, to quickly make room temperature reach user's set temperature, when the temperature difference reduces or uses
Heat pump central controller control user's water frequency variable circulating pump turns down frequency when amount amount is reduced, and simultaneously closes off part outdoor heat pump unit
Operation reaches dynamic control operation power, uses double action to reach to save electric energy and meet user.
Type controller each in system can be accessed Internet by the WiFi network communication technology by heat pump central controller, will be outdoor
The data such as temperature, room temperature, indoor fan operating condition, operation of heat pump situation, solar thermal collector efficiency are uploaded to remotely
Server, can the adjusting situation of real time inspection room temperature and the operating condition of each equipment, may also connect to by user mobile phone
Remote data base realizes remote viewing device operating condition.
Heat pump central controller is formed using module erection method, including block main control core mainboard, one piece of RS485 serial communication
Mainboard, two piece of 8 road DI interface board, two piece of 8 road DO interface board.
Main control core mainboard has 1 road RS485 communication, 1 road RS232 communication, 1 road USB communication, 1 group of 12Pin eight simultaneously
Row bus communication and WiFi wireless communication function.The main control core mainboard can pass through eight parallel-by-bit bus communication of 12Pin
Interface carries out hardware capability extension.
Eight parallel-by-bit bus communication interface of 12Pin includes 8Pin data/address bus, 1Pin enabled control signal wire, 3Pin function
Multiplex bus.When enabled control signal wire is high level, the main control core mainboard and the RS485 serial communication mainboard
Communication, 3Pin multiplexing functions bus is clock cable, read-write marking signal line, slave operation completion signal wire at this time.When making
When to can control signal wire be low level, the main control core mainboard and the 8 road DI interface board and the 8 road DO interface board are logical
Letter, 3Pin multiplexing functions bus is 3-8 address code bus at this time.By technology it is found that the RS485 serial communication mainboard with
The communication of the 8 road DI interface board and the 8 road DO interface board, which enables level, only to be needed on the contrary.
RS485 serial communication mainboard has 4 road RS485 interfaces, 1 group of eight parallel-by-bit bus communication interface of 12Pin.It is described
RS485 serial communication mainboard can pass through the eight parallel-by-bit bus communication interface conduct of 12Pin by the main control core mainboard
Hardware capability extension uses.The RS485 serial communication mainboard also can be used as independent serial communication trunking and use.By skill
Art is it is found that the RS485 interface can be replaced by RS232 interface.
8 road DO interface boards have 1 group of eight parallel-by-bit bus communication interface of 12Pin, 8 toggle switch address choices, 8 tunnels after
Electric appliance output interface.When the main control core mainboard and the 8 road DO interface board communications, 3Pin multiplexing functions bus institute is right
The 3-8 address code answered is consistent with 8 toggle switch, and the 8Pin data in the eight parallel-by-bit bus communication interface of 12Pin are total
The level state of line can be forwarded to the driving actuating of relay switching of relay output driver, by technology it is found that relay exports
It can be replaced transistor output.
Claims (4)
1. the present invention relates to a kind of energy-saving heat pump air-conditioner set and energy-saving control method, including heat pump air conditioner unit includes more
Outdoor heat pump unit, heat pump branch pipe(tube) motor-driven valve, insulated water tank, unit water frequency variable circulating pump, user's water frequency variable circulating pump, heat pump
Central controller, multiple groups indoor fan coil pipe and multiple groups indoor fan coil pipe controller, it is characterised in that:
The insulated water tank, outdoor heat pump unit, heat pump branch pipe(tube) motor-driven valve, unit water frequency variable circulating pump composition cooling/heating follow
Loop back path, wherein recirculated water is recycled by the frequency variable circulating pump, and unit water frequency variable circulating pump receives the control of heat pump central controller
Signal Regulation running frequency processed；
The insulated water tank, user's water frequency variable circulating pump, indoor fan coil pipe form user's circulation loop；Wherein recirculated water is by institute
It states user's water frequency variable circulating pump to recycle, user's water frequency variable circulating pump receives the control signal of heat pump central controller, indoor fan
Running frequency is controlled to adjust by indoor fan coil pipe controller；
There is heat of the heat-exchanger rig for refrigerant inside heat pump unit and cooling/heating circulation loop to hand over inside the outdoor heat pump unit
It changes, the cooling/heating circulation loop and user's circulation loop share the same insulated water tank and recirculated water, the insulated water tank band
There is liquid level sensor and has the function of to supplement recirculated water；The heat pump branch pipe(tube) motor-driven valve to match with heat pump quantity with it is described
Outdoor heat pump unit is connected in series；
The heat pump central controller and indoor fan coil pipe controller have WiFi wireless communication function, the heat pump central controller control
The outdoor heat pump unit, the heat pump branch pipe(tube) motor-driven valve, the unit water frequency variable circulating pump, user's water frequency conversion circulation
Pump and the indoor fan coil pipe controller implement function such as:
The heat pump central controller detects the set temperature and the insulated water tank temperature of the multiple groups indoor fan coil pipe controller
Difference controls the outdoor heat pump unit start and stop quantity according to described two temperature gaps；
The heat pump central controller detects control user's water frequency conversion circulation when the indoor fan coil pipe controller operation quantity increases
The frequency upgrading of pump；
The heat pump central controller detects the frequency that unit water frequency variable circulating pump is controlled when the outdoor heat pump unit operation quantity increases
Rate is promoted；
All outdoor heat pump units of heat pump central controller detection, the control pair when some or several outdoor heat pump units are closed
The heat pump branch pipe(tube) motor-driven valve answered is closed.
2. the heat pump central controller can be realized and the indoor fan coil pipe controller communication, composition one using WiFi communication technology
The heating control system for covering closed loop, realizes the on-demand regulation to heating system heat source.
3. type controller each in system can be accessed Internet by WiFi communication technology by the heat pump central controller, by outdoor temp
The data such as degree, room temperature, indoor fan operating condition, operation of heat pump situation, solar thermal collector efficiency are uploaded to long-range clothes
Business device, remote user can the adjusting situation of real time inspection room temperature and the operating condition of each equipment.
4. a kind of heat pump central controller, it is characterised in that including block main control core mainboard, one piece of RS485 serial communication mainboard, two
8 road DI interface board of block, two piece of 8 road DO interface board；The heat pump central controller is used for processing routine, operation power when described program is run
Benefit require 1,2,3 described in heat pump air conditioner control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811287509.3A CN110006136A (en) | 2018-10-31 | 2018-10-31 | A kind of heat pump air conditioner unit and energy-saving control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811287509.3A CN110006136A (en) | 2018-10-31 | 2018-10-31 | A kind of heat pump air conditioner unit and energy-saving control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110006136A true CN110006136A (en) | 2019-07-12 |
Family
ID=67164975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811287509.3A Withdrawn CN110006136A (en) | 2018-10-31 | 2018-10-31 | A kind of heat pump air conditioner unit and energy-saving control method |
Country Status (1)
| Country | Link |
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| CN (1) | CN110006136A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2301649Y (en) * | 1997-06-20 | 1998-12-23 | 周进志 | Domestic central air conditioner |
| CN1563828A (en) * | 2004-04-05 | 2005-01-12 | 王春刚 | variable capacity, variable flow(VRWV) air conditioning system |
| CN201476203U (en) * | 2009-08-25 | 2010-05-19 | 上海朗诗建筑科技有限公司 | Indoor-type radiation central air-conditioning system with constant temperature of supplied water |
| JP2010230184A (en) * | 2009-03-26 | 2010-10-14 | Orion Mach Co Ltd | Temperature and humidity control device |
| CN102692052A (en) * | 2011-03-21 | 2012-09-26 | 广州科力新能源有限公司 | Cold and hot water type precise air conditioning system |
| CN103868205A (en) * | 2012-12-13 | 2014-06-18 | 美的集团股份有限公司 | Air conditioner and control method thereof |
| CN205066054U (en) * | 2015-09-07 | 2016-03-02 | 深圳万城节能股份有限公司 | Controlling means and control system of central air conditioning water system |
-
2018
- 2018-10-31 CN CN201811287509.3A patent/CN110006136A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2301649Y (en) * | 1997-06-20 | 1998-12-23 | 周进志 | Domestic central air conditioner |
| CN1563828A (en) * | 2004-04-05 | 2005-01-12 | 王春刚 | variable capacity, variable flow(VRWV) air conditioning system |
| JP2010230184A (en) * | 2009-03-26 | 2010-10-14 | Orion Mach Co Ltd | Temperature and humidity control device |
| CN201476203U (en) * | 2009-08-25 | 2010-05-19 | 上海朗诗建筑科技有限公司 | Indoor-type radiation central air-conditioning system with constant temperature of supplied water |
| CN102692052A (en) * | 2011-03-21 | 2012-09-26 | 广州科力新能源有限公司 | Cold and hot water type precise air conditioning system |
| CN103868205A (en) * | 2012-12-13 | 2014-06-18 | 美的集团股份有限公司 | Air conditioner and control method thereof |
| CN205066054U (en) * | 2015-09-07 | 2016-03-02 | 深圳万城节能股份有限公司 | Controlling means and control system of central air conditioning water system |
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Application publication date: 20190712 |