CN106152376B - High drop multi-online air-conditioning system and its control method - Google Patents
High drop multi-online air-conditioning system and its control method Download PDFInfo
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Abstract
A kind of control method of high drop multi-online air-conditioning system, it include: pressure at expulsion, the actual temperature and pressure of outdoor unit electronic expansion valve outlet of compressor of outdoor unit described in real-time monitoring, and saturation temperature corresponding with the pressure is matched, calculate the temperature difference of the actual temperature Yu the saturation temperature；Compare the pressure at expulsion and the control pressure of the compressor of outdoor unit, if the pressure at expulsion of the compressor of outdoor unit is greater than the control pressure, the aperture of the outdoor unit electric expansion valve is adjusted according to the temperature difference.A kind of high drop multi-online air-conditioning system provided by the invention and its control method, pass through the secondary comparison of pressure and temperature, adjust the aperture of electric expansion valve, when being able to solve between outdoor unit and indoor unit with unconventional high drop, electric expansion valve is because pressure is more than maximum the problem of bearing pressure and causing danger, to realize unconventional high drop connection between air-conditioning system indoor and outdoor machine.
Description
Technical field
The invention belongs to air-conditioning equipment field more particularly to a kind of high drop multi-online air-conditioning system and its control methods.
Background technique
Multi-connected machine (or outdoor unit drags the air-conditioning system of more indoor units, only refers to multi-connected machine in subsequent content) is carrying out
When unconventional high drop connects, due to the self weight (fluid column) of liquid cooling matchmaker, cause that the liquid pipe pressure anomaly of side machine is installed in lower section
Rise.Under Part load, when unit operating pressure is higher, which will cause swollen in lower section installation side machine electronics
Pressure before swollen valve is more than the design pressure of coolant system and causes danger.
The general method for solving this problem is one decompressor of increase in the liquid pipe of outdoor unit, by decompression
The control of device drops to the pressure before being located below machine electronics expansion valve within the scope of safe pressure, to make unit in safety
Operation.
Summary of the invention
The present invention provides a kind of pressure of the electric expansion valve of machine that can guarantee to be mounted on lower section in safe pressure model
High drop multi-online air-conditioning system and its control method in enclosing.
A kind of control method of high drop multi-online air-conditioning system, comprising:
Set the control pressure of air-conditioning system；
Pressure at expulsion, the actual temperature and pressure of outdoor unit electronic expansion valve outlet of compressor of outdoor unit described in real-time monitoring
Power, and saturation temperature corresponding with the pressure is matched, calculate the temperature difference of the actual temperature Yu the saturation temperature；
The pressure at expulsion and the control pressure for comparing the compressor of outdoor unit, if the exhaust of the compressor of outdoor unit
Pressure is greater than the control pressure, and the aperture of the outdoor unit electric expansion valve is adjusted according to the temperature difference.
If further include: the pressure at expulsion of the compressor of outdoor unit is less than the control pressure, and the outdoor unit electronics is swollen
Swollen valve opening increases, and repeats above-mentioned comparison procedure；If the pressure at expulsion of the compressor of outdoor unit is equal to the control pressure,
The outdoor unit electronic expansion valve opening is kept.
The outdoor unit control pressure setting process is as follows:
When outdoor unit is higher than indoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum drop；
According to the electric expansion valve of indoor unit it is maximum bear pressure, refrigerant is close in above-mentioned maximum drop and air-conditioning system
The control pressure is calculated in degree；
Or when indoor unit is higher than outdoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum and fall
Difference；
According to the electric expansion valve of outdoor unit it is maximum bear pressure, refrigerant is close in above-mentioned maximum drop and air-conditioning system
The control pressure is calculated in degree.
Further include the control temperature determined according to the pressure-enthalpy chart of the refrigerant when refrigerant is in the mass dryness fraction of system requirements, makes institute
The temperature difference is stated to be compared with the control temperature.
The temperature difference is compared with the control temperature and specifically includes:
When the temperature difference is greater than the control temperature, increase the aperture of the outdoor unit electric expansion valve, until described
The temperature difference is equal to the control temperature；
When the temperature difference is equal to the control temperature, the aperture of the outdoor unit electric expansion valve is kept；
When the temperature difference is less than the control temperature, reduce the aperture of the outdoor unit electric expansion valve, until described
The temperature difference is equal to the control temperature.
The control pressure is calculated according to following equation:
Formula are as follows: PK=Px-Py-ρLgHmax；
Wherein: PkTo control pressure；
PxMaximum for electronic expansion valve of indoor unit bears pressure；
PyFor control parameter error compensation；
ρLFor refrigerant density；
G is the acceleration of gravity of system operating area；
HmaxFor maximum drop.
When outdoor unit is multiple, the control pressure is unified to set, and each outdoor unit electric expansion valve is according to this
The pressure of compressor of outdoor unit outlet and the observed temperature and saturation of the control pressure and the outdoor unit electronic expansion valve outlet
The temperature difference of temperature carries out individual aperture control.
It further include a kind of high drop multi-online air-conditioning system using above-mentioned control method, including at least one outdoor unit
With at least one indoor unit, outdoor unit electric expansion valve is provided at the general export of all outdoor units, it is described outdoor electromechanical
Sub- expansion valve outlet is provided with the temperature sensor for measuring refrigerant temperature and the pressure sensor for measuring refrigerant pressure.
The outdoor unit electric expansion valve is multiple, and all outdoor unit electric expansion valves are arranged in parallel, the temperature
Degree sensor and the pressure sensor are set at the general export of all outdoor unit electric expansion valves.
A kind of high drop multi-online air-conditioning system provided by the invention and its control method, pass through the secondary ratio of pressure and temperature
Compared with, the aperture of the outer machine electric expansion valve of regulation room, when being able to solve between outdoor unit and indoor unit with unconventional high drop,
Electric expansion valve because pressure is more than maximum the problem of bearing pressure and causing danger, thus realize air-conditioning system indoor and outdoor machine it
Between unconventional high drop connection.
Figure of description
Fig. 1 is the flow chart of the embodiment of high drop multi-online air-conditioning system provided by the invention and its control method；
Fig. 2 is the flow chart of the embodiment of high drop multi-online air-conditioning system provided by the invention and its control method；
Fig. 3 is the pressure-enthalpy chart of the refrigerant R410A of high drop multi-online air-conditioning system provided by the invention and its control method；
Fig. 4 is the structural representation of the air-conditioning system of high drop multi-online air-conditioning system provided by the invention and its control method
Figure；
Fig. 5 is the partially schematic of the air-conditioning system of high drop multi-online air-conditioning system provided by the invention and its control method
Figure.
Specific embodiment
Below by specific embodiment and in conjunction with attached drawing, the present invention will be described in detail.
A kind of control method of high drop multi-online air-conditioning system as depicted in figs. 1 and 2, comprising:
The control pressure of air-conditioning system is set, the pressure for guaranteeing that the electric expansion valve for being mounted on lower section is born is less than it most
It is big to bear pressure；Reducing the pressure that the electric expansion valve is born, there are two types of methods, and one is the rows for reducing compressor of outdoor unit
Atmospheric pressure is the mass dryness fraction of the refrigerant second is that refrigerant is made to become gas-liquid two-phase before the electric expansion valve.
Pressure at expulsion, the actual temperature and pressure of outdoor unit electronic expansion valve outlet of compressor of outdoor unit described in real-time monitoring
Power, and saturation temperature corresponding with the pressure is matched, the temperature difference of the actual temperature Yu the saturation temperature is calculated, is passed through
The temperature difference guarantees the mass dryness fraction；
The pressure at expulsion and the control pressure for comparing the compressor of outdoor unit, if the exhaust of the compressor of outdoor unit
Pressure is greater than the control pressure, and the aperture of the outdoor unit electric expansion valve is adjusted according to the temperature difference.
If further include: the pressure at expulsion of the compressor of outdoor unit is less than the control pressure, and the outdoor unit electronics is swollen
Swollen valve opening increases, and repeats above-mentioned comparison procedure, that is, is gradually increased the aperture of the outdoor unit electric expansion valve, guarantees installation
The pressure that electric expansion valve in lower section is born is less than its maximum and bears pressure；If the pressure at expulsion of the compressor of outdoor unit
Equal to the control pressure, the outdoor unit electronic expansion valve opening is kept.
The outdoor unit control pressure setting process is as follows:
When outdoor unit is higher than indoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum drop；
According to the electric expansion valve of indoor unit it is maximum bear pressure, refrigerant is close in above-mentioned maximum drop and air-conditioning system
The control pressure is calculated in degree；
Or when indoor unit is higher than outdoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum and fall
Difference；
According to the electric expansion valve of outdoor unit it is maximum bear pressure, refrigerant is close in above-mentioned maximum drop and air-conditioning system
The control pressure is calculated in degree.
Further include the control temperature determined according to the pressure-enthalpy chart of the refrigerant when refrigerant is in the mass dryness fraction of system requirements, makes institute
The temperature difference is stated to be compared with the control temperature.
When adjusting the electric expansion valve:
When the temperature difference is greater than the control temperature, increases the aperture of the outdoor unit electric expansion valve, pass through electronics
The throttling action of expansion valve increases the gaseous parts of the refrigerant, and then reduces the operating pressure of the air-conditioning system；
When the temperature difference is equal to the control temperature, the aperture of the outdoor unit electric expansion valve is kept；
When the temperature difference is less than the control temperature, reduce the aperture of the outdoor unit electric expansion valve, described in increase
The gaseous parts of refrigerant, and then reduce the operating pressure of the air-conditioning system.
The control pressure is calculated according to following equation:
Formula are as follows: PK=Px-Py-ρLgHmax；
Wherein: PkTo control pressure；
PxMaximum for electronic expansion valve of indoor unit bears pressure；
PyFor control parameter error compensation；
ρLFor refrigerant density；
G is the acceleration of gravity of system operating area；
HmaxFor maximum drop.
When outdoor unit is multiple, the control pressure is unified to set, and each outdoor unit electric expansion valve is according to this
The pressure of compressor of outdoor unit outlet and the observed temperature and saturation of the control pressure and the outdoor unit electronic expansion valve outlet
The temperature difference of temperature carries out individual aperture control.
A kind of high drop multi-online air-conditioning system using above-mentioned control method as shown in Figure 3 and Figure 5, including at least
One outdoor unit 1 and at least one indoor unit 4 are provided with outdoor unit electric expansion valve at the general export of all outdoor units 1
3, the outdoor unit electric expansion valve 3, which exports, is provided with temperature sensor for measuring refrigerant temperature and for measuring refrigerant pressure
The pressure sensor of power.
The outdoor unit electric expansion valve 3 is multiple, and all outdoor unit electric expansion valves 3 are arranged in parallel, described
Temperature sensor and the pressure sensor are set at the general export of all outdoor unit electric expansion valves 3.
Embodiment
When the air-conditioning system of the application uses R410A refrigerant, outdoor unit is in upper installation, and indoor units are in lower installation, tool
Steps are as follows for body:
When measuring actual installation, drop is 100m between outdoor unit and indoor unit；
According to the prior art, the density for obtaining R410A refrigerant is ρ=932kg/m3, use the system highest of R410A refrigerant
Design pressure is Px=4.15MPa, system control parameters error compensation Py=0.05MPa；
Setting the refrigerant mass dryness fraction that the air-conditioning system needs is 0.1, and reading mass dryness fraction according to the pressure-enthalpy chart of R410A refrigerant is 0
When corresponding temperature be 34 °, read corresponding temperature when mass dryness fraction is 0.1 be 24 ° to get to described controlled at Tk=34 °-
24 °=10 °；
Obtain gravity acceleration g=9.8m/s of operating area2
The control pressure is calculated according to following equation:
Formula are as follows: PK=Px-Py-ρLgHmax；
Wherein: PkTo control pressure；
PxMaximum for electronic expansion valve of indoor unit bears pressure；
PyFor control parameter error compensation；
ρLFor refrigerant density；
G is the acceleration of gravity of system operating area；
HmaxFor maximum drop.
PK=Px-Py-ρLgHmax=4.15MPa-932kg/m3*9.8m/s2* 100m-0.05MPa=3.187MPa
It is 3.187MPa that the control pressure, which is then calculated,；
The pressure at expulsion P of compressor of outdoor unit 2 described in real-time measurementd, 3 outlet temperature of outdoor unit electric expansion valve and
Pressure, and the saturation temperature according to corresponding to air-conditioning saturation temperature and the pressure table of comparisons reading pressure (as follows), and calculate
The temperature difference T of the outlet temperature and the saturation temperature out0；
Air-conditioning saturation temperature and the pressure table of comparisons
Compare PdAnd Pk:
If Pd> Pk, compare T0And Tk:
If T0> TkWhen, increase the aperture of the outdoor unit electric expansion valve 3, until T0=Tk, pass through electric expansion valve
Throttling action increases the gaseous parts of the refrigerant, and then reduces the operating pressure of the air-conditioning system, guarantees the indoor unit
The pressure that electric expansion valve is born is less than maximum receiving pressure；
If T0=Tk, the aperture of the outdoor unit electric expansion valve 3 is kept, i.e. current state can guarantee the air-conditioning system
System can work normally；
If T0=Tk, reduce the aperture of the outdoor unit electric expansion valve 3, until T0=Tk, increase the liquid of the refrigerant
Part, and then reduce the operating pressure of the air-conditioning system, guarantee that the pressure that the electronic expansion valve of indoor unit is born is less than most
It is big to bear pressure；
If Pd=Pk, keep the aperture of the outdoor unit electric expansion valve 3；
If Pd< Pk, it is gradually increased the aperture of the outdoor unit electric expansion valve 3, and compare T in real time0And Tk, repeat more than
Step, until T0=Tk。
A kind of high drop multi-online air-conditioning system provided by the invention and its control method, pass through the secondary ratio of pressure and temperature
Compared with, adjust the aperture of electric expansion valve, be able to solve between outdoor unit and indoor unit have unconventional high drop when, electronics is swollen
Swollen valve is because pressure is more than maximum the problem of bearing pressure and causing danger, to realize extraordinary between air-conditioning system indoor and outdoor machine
Advise high drop connection.
Only the preferred embodiments of the present invention have been described above, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of control method of high drop multi-online air-conditioning system, it is characterised in that: include:
Set the control pressure of air-conditioning system；
Pressure at expulsion, the actual temperature and outdoor unit electronics of outdoor unit electronic expansion valve outlet of real-time monitoring compressor of outdoor unit
The pressure of expansion valve outlet, and saturation temperature corresponding with the pressure of the outdoor unit electronic expansion valve outlet is matched, it calculates
The temperature difference of the actual temperature and the saturation temperature；
The pressure at expulsion and the control pressure for comparing the compressor of outdoor unit, if the pressure at expulsion of the compressor of outdoor unit
Greater than the control pressure, the aperture of the outdoor unit electric expansion valve is adjusted according to the temperature difference；
It further include the control temperature determined according to the pressure-enthalpy chart of refrigerant when refrigerant is in the mass dryness fraction of system requirements, the temperature difference and control
Temperature processed is compared；
Wherein, the temperature difference is compared with the control temperature and specifically includes:
When the temperature difference is greater than the control temperature, increase the aperture of the outdoor unit electric expansion valve, until the temperature difference
Equal to the control temperature；
When the temperature difference is equal to the control temperature, the aperture of the outdoor unit electric expansion valve is kept；
When the temperature difference is less than the control temperature, reduce the aperture of the outdoor unit electric expansion valve, until the temperature difference
Equal to the control temperature；
Wherein, the pressure-enthalpy chart controlled at according to refrigerant determines temperature and root when refrigerant is in the mass dryness fraction of system requirements
It is calculated according to the temperature difference that the pressure-enthalpy chart of refrigerant determines that refrigerant is in when mass dryness fraction is 0.
2. control method according to claim 1, it is characterised in that: further include: if the exhaust of the compressor of outdoor unit
Pressure is less than the control pressure, and the outdoor unit electronic expansion valve opening increases, and repeats above-mentioned comparison procedure；If the room
The pressure at expulsion of outer machine compressor is equal to the control pressure, and the outdoor unit electronic expansion valve opening is kept.
3. control method according to claim 1, it is characterised in that: the outdoor unit control pressure setting process is as follows:
When outdoor unit is higher than indoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum drop；
It is calculated according to the density of refrigerant in the maximum receiving pressure of electronic expansion valve of indoor unit, above-mentioned maximum drop and air-conditioning system
Obtain the control pressure；
Or when indoor unit is higher than outdoor unit, the drop of all outdoor units Yu all indoor units is measured, and select maximum drop；
It is calculated according to the density of refrigerant in the maximum receiving pressure of outdoor unit electric expansion valve, above-mentioned maximum drop and air-conditioning system
Obtain the control pressure.
4. control method according to claim 1, it is characterised in that: calculate the control pressure according to following equation:
Formula are as follows: PK=Px-Py-ρLgHmax；
Wherein: PkTo control pressure；
PxMaximum for electronic expansion valve of indoor unit bears pressure；
PyFor control parameter error compensation；
ρLFor refrigerant density；
G is the acceleration of gravity of system operating area；
HmaxFor maximum drop.
5. control method according to claim 1, it is characterised in that: when outdoor unit is multiple, the control pressure system
One setting, pressure and the control pressure that each outdoor unit electric expansion valve is exported according to the compressor of outdoor unit and
The observed temperature of the outdoor unit electronic expansion valve outlet and the temperature difference of saturation temperature carry out individual aperture control.
6. a kind of high drop multi-online air-conditioning system using control method described in any one of any one of claims 1 to 44, including extremely
Lack an outdoor unit and at least one indoor unit, be provided with outdoor unit electric expansion valve at the general export of all outdoor units,
It is characterized by: the electronic expansion valve outlet is provided with temperature sensor for measuring refrigerant temperature and for measuring refrigerant
The pressure sensor of pressure.
7. high drop multi-online air-conditioning system according to claim 6, it is characterised in that: further include that multiple parallel connections respectively are set
The electric expansion valve in the exit of each outdoor unit is set, the temperature sensor and the pressure sensor are set to institute
At the general export for having multiple electric expansion valves.
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| CN106152376B true CN106152376B (en) | 2019-10-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313358A (en) * | 2010-07-01 | 2012-01-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method for exhaust pressure of carbon-dioxide heat-pump water heater |
| CN102635926A (en) * | 2012-04-26 | 2012-08-15 | 青岛海尔空调电子有限公司 | Air conditioning system and pressure adjusting method for same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8322155B2 (en) * | 2006-08-15 | 2012-12-04 | American Power Conversion Corporation | Method and apparatus for cooling |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313358A (en) * | 2010-07-01 | 2012-01-11 | 珠海格力节能环保制冷技术研究中心有限公司 | Control method for exhaust pressure of carbon-dioxide heat-pump water heater |
| CN102635926A (en) * | 2012-04-26 | 2012-08-15 | 青岛海尔空调电子有限公司 | Air conditioning system and pressure adjusting method for same |
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