CN104913459B - Refrigeration air-conditioner cold medium flux real-time control method and device - Google Patents
Refrigeration air-conditioner cold medium flux real-time control method and device Download PDFInfo
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- CN104913459B CN104913459B CN201510358203.2A CN201510358203A CN104913459B CN 104913459 B CN104913459 B CN 104913459B CN 201510358203 A CN201510358203 A CN 201510358203A CN 104913459 B CN104913459 B CN 104913459B
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- expansion valve
- step number
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Abstract
The present invention, which provides a kind of refrigeration air-conditioner cold medium flux real-time control method and device, methods described, to be included：Calculate expansion valve first opens step number；If compressor actual motion is oepration at full load, step number control unit liquid supply rate is opened according to the first of the expansion valve；If compressor actual motion is operation at part load, according to the first of the expansion valve the second unlatching step number or its correction value for opening step number calculating expansion valve, according to the liquid supply rate for stating the second unlatching step number or its correction value control unit of the expansion valve.Refrigeration air-conditioner cold medium flux real-time control method and device of the present invention, by calculating unlatching step number of the expansion valve when compressor actual load is run, electronic expansion valve opening is adjusted in real time, to reach the purpose of accuracy-control system cold medium flux, its advantage is to control more accurately, ensures reliable, the stable operation of unit.
Description
Technical field
The invention belongs to Central air-conditioning unit control technology field, the cold medium flux for relating generally to air-conditioner set controls in real time
Method and device.
Background technology
At present, full-liquid type or falling film type cold water/source pump are generally using the compressor air suction degree of superheat as electronic expansion
The feedback signal of valve carries out feed flow control, and this control method is relatively more suitable for this kind of compressor air suction mistake of dry type cold water/heat pump
The unit of temperature larger (2-5 DEG C), but for full-liquid type or this kind of compressor air suction degree of superheat very little of falling film type cold water/heat pump very
But control accuracy be present and the defects of stability be difficult to ensure that in most zero unit.
The content of the invention
It is real it is an object of the invention to provide a kind of refrigeration air-conditioner cold medium flux in view of the above the shortcomings that prior art
Period control method and device.
In order to achieve the above objects and other related objects, the present invention provides a kind of real-time controlling party of refrigeration air-conditioner cold medium flux
Method, methods described include：
Calculate expansion valve first opens step number；
If compressor actual motion is oepration at full load, opens step number control unit according to the first of the expansion valve and supply
Liquid measure；
If compressor actual motion is operation at part load, opens step number according to the first of the expansion valve and calculate expansion
The second of valve opens step number or its correction value, according to the expansion valve state the second unlatching step number or its correction value controls unit
Liquid supply rate.
According to the present invention, the first of the expansion valve opens unlatching step number when step number is compressor oepration at full load；Institute
Unlatching step number when the second unlatching step number for stating expansion valve is compressor section load operation.
According to the present invention, the first of the expansion valve opens step number, according to the unlatching step number of heating condition and cooling condition
Calculate and obtain with suction and discharge pressure difference.
Preferably, the suction draught head is calculated and obtained according to pressure at expulsion measured value and nominal pressure of inspiration(Pi), wherein, institute
State nominal pressure of inspiration(Pi) and be equal to refrigerant saturation pressure corresponding to nominal evaporating temperature.
According to the present invention, under 75% and 50% energy level, when theoretical load and actual load difference, to the expansion valve
Second unlatching step number be modified.
According to the present invention, by controlling the unlatching step number of expansion valve to control the liquid supply rate of unit；First, setting expansion valve is opened
Start several maxima and minimas；If the first unlatching step number of the expansion valve being calculated or stating for the expansion valve second are opened
Several or its correction value that starts is more than the maximum of the unlatching step number of the expansion valve, then controls actual unlatching step number of expansion valve etc.
In the maximum of the unlatching step number of the expansion valve；If the first of the expansion valve being calculated opens step number or the expansion valve
The minimum value of the second unlatching step number or its correction value less than the unlatching step number of the expansion valve is stated, then controls actually opening for expansion valve
Start minimum value of the number equal to the unlatching step number of the expansion valve.
To realize the above method, the present invention also provides a kind of refrigeration air-conditioner cold medium flux real-time control apparatus, including control
Module, pressure detecting module and temperature detecting module；Wherein,
The control module is used for treatment temperature and pressure data, and controls the startup of compressor and swollen according to result
The opening and closing of swollen valve；
The pressure detecting module, for gathering the pressure data of evaporator and condenser；
The temperature detecting module, for gathering the temperature data of evaporator and condenser.
Preferably, described device also includes human-computer interaction module, for realizing man-machine interaction.
Preferably, the pressure detecting module includes high-pressure pressure sensor and low-pressure sensor, respectively with it is described
The analog input port connection of control module, for gathering the pressure value of evaporator and the pressure value of condenser.
Preferably, the temperature detecting module includes evaporator leaving water temperature sensors and leaving condenser water temperature senses
Device, it is connected respectively with the temperature data input port of the control module, for gathering evaporator leaving water temperature and condenser
Leaving water temperature.
As described above, refrigeration air-conditioner cold medium flux real-time control method of the present invention and device, by calculating expansion valve
Unlatching step number when compressor actual load is run, is adjusted in real time to electronic expansion valve opening, to reach accurate control
The purpose of system cold medium flux, its advantage are to control more accurately, ensure reliable, the stable operation of unit.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
When Fig. 1 is the compressor oepration at full load that the embodiment of the present invention 1 provides, the flow chart of unit cold medium flux.
Fig. 2 is the structural representation for the refrigeration air-conditioner cold medium flux real-time control apparatus that the embodiment of the present invention 2 provides.
When Fig. 3 is the compressor section load operation that the embodiment of the present invention 2 provides, the flow chart of unit cold medium flux.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
Fig. 1 is referred to Fig. 3.It should be clear that the diagram provided in the present embodiment only illustrates the base of the present invention in a schematic way
This conception, then in schema only display with relevant component in the present invention rather than according to component count during actual implement, shape and
Size is drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout type
State may also be increasingly complex.
Embodiment 1
The evaporator leaving water temperature Teo collected in real time according to system, nominal evaporating temperature Te=Teo-2 is calculated, then
Suction and discharge pressure difference x=P is calculated according to pressure at expulsion measured value and nominal pressure of inspiration(Pi)d-Ps, (PdFor pressure at expulsion measured value；
PsFor nominal pressure of inspiration(Pi), its value is equal to refrigerant saturation pressure corresponding to Te).
Theoretical according to the expansion valve of heating condition and cooling condition opens step number and suction draught head, is counted by formula (1)
Unlatching step number y of the expansion valve in compressor oepration at full load is calculated,
Wherein, d1 is the suction draught head under cooling condition, and n1 is that the electric expansion valve under cooling condition opens step number, d2
For the suction draught head under heating condition, n2 is that the electric expansion valve under heating condition opens step number, and x is actual measurement suction air pressure
Difference.
If compressor actual motion is oepration at full load, the expansion valve being calculated by formula (1) in compressor at full capacity
Unlatching step number y and expansion valve during operation open the liquid supply rate of step number limit value control unit.First, set expansion valve and open step number
Maxima and minima；If y is more than the maximum of the unlatching step number of expansion valve, the actual unlatching step number etc. of expansion valve is controlled
In the maximum of the unlatching step number of expansion valve；If y is less than the minimum value of the unlatching step number of expansion valve, the reality of expansion valve is controlled
The minimum value that step number is equal to the unlatching step number of expansion valve is opened, so as to control cold medium flux in real time.
Embodiment 2
A kind of controller using new cold medium flux real time control algorithms, including man-machine interaction unit, programme-control
Device, high-pressure pressure sensor, low-pressure sensor, evaporator leaving water temperature sensors and leaving condenser water temperature sensor,
As shown in Fig. 2 wherein, man-machine interaction unit is connected with cyclelog, high-pressure pressure sensor, low-pressure sensor, steaming
Hair device leaving water temperature sensors and leaving condenser water temperature sensor are respectively connected with cyclelog circuit.
In use, evaporator leaving water temperature sensors are connected on the evaporator of air-conditioning, leaving condenser water temperature sensing
Device is connected on condenser, and high-pressure pressure sensor is connected on evaporator, and low-pressure sensor is connected on condenser.Journey
Sequence controller is controlled to the liquid supply rate of unit with the following method according to the temperature and pressure value collected.
Unlatching step number y of the expansion valve in compressor oepration at full load is calculated using the method for embodiment 1, then calculated swollen
Unlatching step number of the swollen valve in compressor section load operation.Expansion valve cold accounts for expansion valve standard-sized sheet cold percentage bx can root
Obtained according to y-bx data (expansion valve performance curve data) built-in in cyclelog；If do not have in cyclelog built-in
Y-bx data, it can also be calculated according to formula (2),
Bx=(A1y2- B1y+C1)/1000 (2),
Wherein, when y is is equal to different unlatching step numbers by A1, B1, C1, according to expansion valve performance curve in y point step numbers
Compared with cold, then cold when expansion valve standard-sized sheet, one group of corresponding bx value is calculated, then above-mentioned data are filled out
Enter in excel forms, matched curve draws A1, B1, C1, then formula (2) is built in cyclelog, according to different y
Value calculates bx.
As bx calculated value ＜ 0, bx=0 is taken；As bx calculated value ＞ 1, bx=1 is taken.As 0≤bx≤1, bx is formula
(2) income value is calculated.
Assuming that current energy level is u (1.00 >=u >=0.00), then cold percentage when sub-load expansion valve cold accounts for standard-sized sheet
Than k=bxu,
Unlatching step number yp of the electric expansion valve in compressor section load operation is calculated according to formula (3),
yp=(A2k3+B2k2+C2k+D2)/1000 (3)
Wherein A2, B2, C2, D2 are the bx values that are obtained according to expansion valve performance curve when yp is equal into different unlatching step numbers,
Bx values are substituted into k=bxu, obtain k values corresponding to yp, then obtain one group of data in aforementioned manners are inserted into excel
In form, matched curve draws A2, B2, C2, D2, and yp is that expansion valve opens step number, result of calculation round numbers；Formula (3) is built-in
In cyclelog, yp is calculated according to different k values.
Work as k<When 0.1, yp=0 is made；Work as k>When 0.97, make yp=expansion valves are maximum to open step number.When 0.1≤k≤0.97
When, yp value is the value calculated by formula (3).
When the actual load of 75% and 50% energy level is not 75% and 50%, in order that result of calculation is more accurate,
In the case of meeting following condition, reply yp is modified according to actual conditions, and modification method is as follows：
When S1_temp≤T1 DEG C of evaporating temperature measured value, (T1 is setting value, and the value is empirical value, and scope can be in 0-12
It is configured between DEG C), and (T2 is evaporator leaving water temperature with Teo-S1_temp >=T2 DEG C of difference surveying evaporating temperature
Setting value, the value are empirical value, and scope can be configured between 1-10 DEG C), the yp that formula (3) is calculated by formula (4)
Value is modified, and revised electric expansion valve opens step number yz and is：
Yz=yp* (1+S) (4)
WhereinTblFor small temperature difference amendment proportional band；M is that electric expansion valve opens step number amendment
Limit value, it is empirical value.
In order to more be accurately controlled the unlatching step number of electric expansion valve, so as to control liquid supply rate, it is necessary to set expansion valve
The limitation of step number is opened, wherein maximum is ymaxIt is y with minimum valuemin。
As long as compressor is opened, y must be ensuredmin≤ yz (or yp)≤ymax.If yz (or yp)≤ymin, then make yz (or
Yp)=yminIf yz (or yp) >=ymax, then yz (or yp)=y is mademax。
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (9)
1. a kind of refrigeration air-conditioner cold medium flux real-time control method, it is characterised in that methods described includes：
Calculate expansion valve first opens step number；
If compressor actual motion is oepration at full load, step number control unit feed flow is opened according to the first of the expansion valve
Amount；
If compressor actual motion is operation at part load, opens step number according to the first of the expansion valve and calculate expansion valve
Second opens step number or its correction value, according to the feed flow for stating the second unlatching step number or its correction value control unit of the expansion valve
Amount；
Wherein, the first of the expansion valve opens unlatching step number when step number is compressor oepration at full load；The expansion valve
Second opens unlatching step number when step number is compressor section load operation；
Unlatching step number y of the expansion valve in compressor oepration at full load is calculated by formula (1),
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Wherein, d1 is the suction draught head under cooling condition, and n1 is that the electric expansion valve under cooling condition opens step number, and d2 is system
Suction draught head under thermal condition, n2 are that the electric expansion valve under heating condition opens step number, and x is actual measurement suction draught head；
Expansion valve cold accounts for expansion valve standard-sized sheet cold percentage bx can be according to y-bx data (expansion built-in in cyclelog
Valve performance curve data) obtain；If there is no built-in y-bx data in cyclelog, can also be calculated according to formula (2),
Bx=(A1y2-B1y+C1)/1000 (2)
Wherein, A1, B1, C1 be when y is equal into different unlatching step numbers, according to cold of the expansion valve performance curve in y point step numbers,
Again compared with cold when expansion valve standard-sized sheet, one group of corresponding bx value is calculated, then above-mentioned data are inserted
In excel forms, matched curve draws A1, B1, C1, and then formula (2) is built in cyclelog, according to different y values
Calculate bx；
As bx calculated value ＜ 0, bx=0 is taken；As bx calculated value ＞ 1, bx=1 is taken；As 0≤bx≤1, bx is formula (2) meter
Calculate income value；Assuming that current energy level is u (1.00 >=u >=0.00), then the cold hundred when sub-load expansion valve cold accounts for standard-sized sheet
Divide and compare k=bxu；
Unlatching step number yp of the electric expansion valve in compressor section load operation is calculated according to formula (3),
yP=(A2k3+B2k2+C2k+D2)/1000 (3)
Wherein A2, B2, C2, D2 are the bx values that are obtained according to expansion valve performance curve, by bx when yp is equal into different unlatching step numbers
Value is substituted into k=bxu, obtains k values corresponding to yp, then obtain one group of data in aforementioned manners are inserted into excel forms
In, matched curve draws A2, B2, C2, D2, and yp is that expansion valve opens step number, result of calculation round numbers；Formula (3) is built in journey
In sequence controller, yp is calculated according to different k values.
2. refrigeration air-conditioner cold medium flux real-time control method as claimed in claim 1, it is characterised in that the first of the expansion valve
Step number is opened, is calculated and obtained according to the unlatching step number and suction and discharge pressure difference of heating condition and cooling condition.
3. refrigeration air-conditioner cold medium flux real-time control method as claimed in claim 2, it is characterised in that the suction draught head root
Calculate and obtain according to pressure at expulsion measured value and nominal pressure of inspiration(Pi), wherein, the nominal pressure of inspiration(Pi) is equal to nominal evaporating temperature
Corresponding refrigerant saturation pressure, the nominal evaporating temperature refer to the evaporating temperature under nominal condition design.
4. refrigeration air-conditioner cold medium flux real-time control method as claimed in claim 1, it is characterised in that in 75% and 50% energy level
Under, when theoretical load and actual load difference, the second unlatching step number of the expansion valve is modified.
5. refrigeration air-conditioner cold medium flux real-time control method as claimed in claim 4, it is characterised in that by controlling expansion valve
Open the liquid supply rate of step number control unit；First, the maxima and minima that expansion valve opens step number is set；If it is calculated
First unlatching step number of expansion valve or state the second unlatching step number or its correction value of the expansion valve are more than opening for the expansion valve
Start several maximums, then controls the actual unlatching step number of expansion valve equal to the maximum of the unlatching step number of the expansion valve；If
First unlatching step number of the expansion valve being calculated or the expansion valve state the second unlatching step number or its correction value be less than it is described
The minimum value of the unlatching step number of expansion valve, then the actual unlatching step number of expansion valve is controlled equal to the unlatching step number of the expansion valve
Minimum value.
A kind of 6. refrigeration air-conditioner cold medium flux real-time control apparatus, it is characterised in that including control module, pressure detecting module and
Temperature detecting module；Wherein,
The control module is used for treatment temperature and pressure data, and the opening and closing of expansion valve is controlled according to result；
The pressure detecting module, for gathering the pressure data of evaporator and condenser；
The temperature detecting module, for gathering the temperature data of evaporator and condenser；
Wherein, control module treatment temperature and the processing mode of pressure data are：
First, the evaporator leaving water temperature Teo collected in real time according to system, nominal evaporating temperature Te=Teo-2 is calculated, then
Suction and discharge pressure difference x=Pd-Ps is calculated according to pressure at expulsion measured value and nominal pressure of inspiration(Pi), (Pd is pressure at expulsion measured value；
Ps is nominal pressure of inspiration(Pi), and its value is equal to refrigerant saturation pressure corresponding to Te), according to the expansion of heating condition and cooling condition
The theoretical of valve opens step number and suction draught head, and compressor oepration at full load is calculated by the computational methods described in claim 1
When unlatching step number y and compressor section load operation when unlatching step number yp；
In order to more be accurately controlled the unlatching step number of electric expansion valve, so as to control liquid supply rate, it is necessary to set expansion valve to open
The limitation of step number, wherein maximum are ymaxIt is y with minimum valueminAs long as compressor is opened, y must be ensuredmin≤ yz (or yp)≤
ymax；If yz (or yp)≤ymin, then yz (or yp)=y is mademinIf yz (or yp) >=ymax, then yz (or yp)=y is mademax；
Wherein yz is that revised electric expansion valve opens step number, yz=yp* (1+S)；
Wherein,TblFor small temperature difference amendment proportional band；M is that electric expansion valve opens step number amendment
Limit value, it is empirical value.
7. refrigeration air-conditioner cold medium flux real-time control apparatus as claimed in claim 6, it is characterised in that described device also includes people
Machine interactive module, for realizing man-machine interaction.
8. refrigeration air-conditioner cold medium flux real-time control apparatus as claimed in claim 6, it is characterised in that the pressure detecting module
Including high-pressure pressure sensor and low-pressure sensor, it is connected, uses with the analog input port of the control module respectively
In the pressure value of collection evaporator and the pressure value of condenser.
9. refrigeration air-conditioner cold medium flux real-time control apparatus as claimed in claim 6, it is characterised in that the temperature detecting module
It is defeated with the temperature data of the control module respectively including evaporator leaving water temperature sensors and leaving condenser water temperature sensor
Inbound port connects, for gathering the leaving water temperature of evaporator leaving water temperature and condenser.
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| WO2017107111A1 (en) * | 2015-12-23 | 2017-06-29 | 詹坤田 | Method and device for controlling flow rate of flooded screw compressor on the basis of opening size |
| CN106055882B (en) * | 2016-05-24 | 2019-04-02 | 珠海格力电器股份有限公司 | Water-cooling screw rod heat pump unit calculation for condenser selection and device |
| CN106568165B (en) * | 2016-11-02 | 2019-05-17 | 广东美的暖通设备有限公司 | A kind of adjusting method of air conditioner electronic expansion valve, system and air conditioner |
| CN106595141B (en) * | 2016-12-12 | 2019-12-27 | 重庆美的通用制冷设备有限公司 | Control method and device of electronic expansion valve and refrigerating system |
| CN109579191B (en) * | 2018-12-25 | 2021-07-13 | 荏原冷热系统（中国）有限公司 | Double-compressor air conditioning system and control method and control device for refrigerant circulation amount thereof |
| CN111609590B (en) * | 2020-04-24 | 2021-06-29 | 珠海格力电器股份有限公司 | Double-temperature air conditioning system, control method and air conditioner |
| CN112050299B (en) * | 2020-09-09 | 2022-03-18 | 青岛海信日立空调系统有限公司 | Air conditioner |
| CN112303856A (en) * | 2020-11-10 | 2021-02-02 | 深圳市柏涛蓝森国际建筑设计有限公司 | Method and system for realizing air conditioner cold load calculation |
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| JP3043770B2 (en) * | 1990-01-12 | 2000-05-22 | 株式会社日立製作所 | Air conditioner |
| KR100868344B1 (en) * | 2002-08-02 | 2008-11-13 | 엘지전자 주식회사 | A driving control method of inverter air- conditioner |
| CN1553111A (en) * | 2003-05-30 | 2004-12-08 | 乐金电子(天津)电器有限公司 | Starting controlling method for frequency-variable air conditioner |
| CN200986353Y (en) * | 2006-11-08 | 2007-12-05 | 江阴精亚空调工程有限公司 | Device for controlling amount of feeding liquid of full liquid type water-cooling screw rod water chilling unit |
| CN101603751B (en) * | 2009-07-15 | 2013-07-10 | 北京科技大学 | Variable frequency energy-saving control method for refrigeration system |
| CN204787045U (en) * | 2015-06-25 | 2015-11-18 | 山东格瑞德集团有限公司 | Refrigeration air conditioner varied refrigerant volume real time control device |
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