CN104748293A - Method for controlling air conditioning super-cooling degree through pressure sensor - Google Patents
Method for controlling air conditioning super-cooling degree through pressure sensor Download PDFInfo
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- CN104748293A CN104748293A CN201310746240.1A CN201310746240A CN104748293A CN 104748293 A CN104748293 A CN 104748293A CN 201310746240 A CN201310746240 A CN 201310746240A CN 104748293 A CN104748293 A CN 104748293A
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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
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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
- F24F2110/00—Control inputs relating to air properties
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a method for controlling the air conditioning super-cooling degree through a pressure sensor and belongs to the field of air conditioning control. The air conditioning comprises an outdoor unit and n indoor units connected with the outdoor unit, wherein n+1 absolute pressure sensors are arranged on the outdoor unit and n indoor units. The method for controlling the air conditioning super-cooling degree includes the following steps: S0, calculating the maximum drop Delta Hmax according to the detection values of the n+1 absolute pressure sensor; S1, conducting correction on the condensing temperature adjustment formula of the outdoor unit outlet and/or the refrigerant of the indoor unit outlets according to the maximum drop Delta Hmax; and S2, controlling the outdoor unit outlet and/or the super-cooling degree SC of the refrigerant of the indoor unit outlets according to the corrected condensing temperature adjustment formula. The method for controlling the air conditioning super-cooling degree through the pressure sensor can effectively avoid the flash phenomenon caused by the abnormal super-cooling degree and improve the operating effect of the refrigerating/heating of the air conditioning units.
Description
Technical field
The present invention relates to air-conditioning degree of supercooling control field, particularly relate to a kind of air-conditioning degree of supercooling control method utilizing pressure sensor.
Background technology
Air-conditioning is subject to the restriction of floor design and installation site in actual installation process, certain height fall is had between usual off-premises station and indoor set, as multiple stage indoor set shares the situation of an off-premises station, because multiple stage indoor set is in different floor or a room usually, will certainly cause between one or more indoor set and off-premises station and there is certain height fall.This height fall can cause having the pressure loss in the course of conveying of refrigerant, this pressure loss can make subcooler produce error according in original calculation of pressure degree of supercooling process, namely degree of supercooling cannot correctly control, thus affects the effect of the refrigerating/heating of air-conditioner set.
Such as: when setting height(from bottom) lower than indoor set of the setting height(from bottom) of off-premises station, the condensing pressure of outdoor pusher side can higher than the condensing pressure of indoor pusher side, namely there is pressure reduction, the liquid refrigerants flowed out from subcooler flows to the process of indoor set, be stressed the effect of losing, and the degree of supercooling of refrigerant can reduce gradually, and the reduction of degree of supercooling can make the refrigerant in liquid pipe pipeline occur flash phenomenon, thus it is uneven to cause the refrigerant flowing to each indoor set to distribute, and affects the refrigeration of air-conditioner set.When setting height(from bottom) higher than indoor set of the setting height(from bottom) of off-premises station, the condensing pressure of outdoor pusher side can lower than the condensing pressure of indoor pusher side, therefore also there is pressure reduction, the refrigerant in liquid pipe pipeline can be made equally to occur flash phenomenon, and the liquid pipe pressure that sometimes even there will be indoor set exceedes the situation of design pressure.
Summary of the invention
In order to overcome the defect of prior art, technical problem to be solved of the present invention is to propose a kind of air-conditioning degree of supercooling control method utilizing pressure sensor, effectively can avoid the abnormal flash phenomenon caused because of degree of supercooling, improve the operational effect of the refrigerating/heating of air-conditioner set.
For reaching this object, the present invention by the following technical solutions:
A kind of air-conditioning degree of supercooling control method utilizing pressure sensor provided by the invention, n the indoor set that described air-conditioning comprises off-premises station and is connected with described off-premises station, described off-premises station and n described indoor set are equipped with n+1 absolute pressure transducer.
Described air-conditioning degree of supercooling control method comprises the steps:
S0: calculate the maximum drop Δ H between described off-premises station and described indoor set according to the detected value of n+1 absolute pressure transducer
max.
S1: according to described maximum drop Δ H
maxformula is regulated to revise to the condensation temperature of described off-premises station outlet and/or described indoor set exit refrigerant.
S2: regulate formula to control the degree of supercooling SC of the outlet of described off-premises station and/or described indoor set exit refrigerant according to revised condensation temperature.
Further technical scheme of the present invention: described condensation temperature regulates the modification method of formula as follows:
S10: according to described maximum drop Δ H
maxcalculate the pressure loss Δ PH that refrigerant flows in pipeline between described off-premises station and described indoor set.
S11: the result of calculation of described pressure loss Δ PH is brought into described condensation temperature and regulates in formula, obtains described revised condensation temperature and regulates formula.
When described air conditioner refrigerating, the condensation temperature adjustment formula of revised described off-premises station exit refrigerant is:
SC
1＝T(Pd±ΔPH)-T
c11
When described air-conditioning heating, the condensation temperature adjustment formula of revised described indoor set exit refrigerant is:
When described off-premises station is positioned at below described indoor set, formula 1 gets negative sign, and formula 2 gets positive sign; When described off-premises station is positioned at the top of described indoor set, formula 1 gets positive sign, and formula 2 gets negative sign.
Further technical scheme of the present invention: described maximum drop Δ H
maxcomputational methods as follows:
S00: height fall Δ H between off-premises station and n described indoor set according to the atmospheric pressure detection value of a described n+1 absolute pressure transducer or the mathematic interpolation of detected value
n.
S01: compare n described height fall Δ H
nsize, obtain the maximum drop Δ H between described off-premises station and described indoor set
max, the computing formula of described maximum drop is:
ΔH
max＝max{|ΔH
n|}。
Further technical scheme of the present invention: step S2 implements as follows:
S21: goal-selling degree of supercooling X and target degree of supercooling Y.
S22: when described air conditioner refrigerating, regulates formula 1 to regulate the aperture of the second electric expansion valve to control the degree of supercooling SC of described off-premises station exit refrigerant according to revised condensation temperature
1level off to target degree of supercooling X.
When described air-conditioning heating, according to revised condensation temperature regulate formula 2 regulate the aperture of the 3rd electric expansion valve control described off-premises station exit refrigerant degree of supercooling SC
2level off to target degree of supercooling Y.
Further technical scheme of the present invention: a described n+1 absolute pressure transducer lays respectively at the position of centre of gravity of described off-premises station and n described indoor set.
Beneficial effect of the present invention is:
Air-conditioning degree of supercooling control method provided by the invention by installing the height fall that absolute pressure transducer calculates indoor set and off-premises station on off-premises station and indoor set, formula is regulated to revise according to the condensation temperature of height fall to indoor set outlet and/or off-premises station exit refrigerant again, achieve according to height fall the accurate control of the degree of supercooling of air-conditioning, effectively prevent the abnormal of degree of supercooling and the flash phenomenon caused, ensure the loading sharing between off-premises station and each indoor set, thus promote the overall operation efficiency of air-conditioner set.
Accompanying drawing explanation
Fig. 1 is the structure chart of the air-conditioner set that the specific embodiment of the invention provides;
Fig. 2 is the flow chart utilizing the air-conditioning degree of supercooling control method of pressure sensor that the specific embodiment of the invention provides;
Fig. 3 is the scheme of installation of the indoor set that provides of the specific embodiment of the invention and off-premises station, and off-premises station is positioned at above indoor set;
Fig. 4 is the scheme of installation of the indoor set that provides of the specific embodiment of the invention and off-premises station, and off-premises station is positioned at below indoor set.
In figure:
1, compressor; 2, oil eliminator; 3, cross valve; 4, outdoor heat converter; 5, the first electric expansion valve; 6, subcooler; 7, gas-liquid separator; 8, tracheae stop valve; 9, liquid pipe stop valve; 10, the second electric expansion valve; 11, the first temperature sensor; 12, the first pressure sensor; 13, the second pressure sensor; 14, indoor heat converter; 15, the 3rd electric expansion valve; 16, the second temperature sensor; 21, off-premises station; 20, indoor set; 22, absolute pressure transducer.
Detailed description of the invention
Technical scheme of the present invention is further illustrated by detailed description of the invention below in conjunction with accompanying drawing.
As shown in Figure 1, the air-conditioner set provided in the present embodiment, comprise off-premises station 21 and n off-premises station 21, n >=1, and n is positive integer.
The inside of off-premises station 21 is provided with compressor 1, oil eliminator 2, cross valve 3, outdoor heat converter 4, first electric expansion valve 5, subcooler 6, gas-liquid separator 7, tracheae stop valve 8 and liquid pipe stop valve 9 etc.The high-pressure side of compressor 1 is connected with oil eliminator 2, and oil eliminator 2 holds with the d of cross valve 3 and gas-liquid separator 7 is connected.The c end of cross valve 3, outdoor heat converter 4, first electric expansion valve 5, subcooler 6 and liquid pipe stop valve 9 connect successively.Gas-liquid separator 7 is also held with the s of cross valve 3, compressor 1 and subcooler 6 are connected.The e end of cross valve 3 is connected with tracheae stop valve 8.
The side of subcooler 6 is provided with the second electric expansion valve 10, one end of second electric expansion valve 10 is connected with the refrigerant pipeline between the first electric expansion valve 5, subcooler 6, the other end of the second electric expansion valve 10 is connected with the inside of subcooler 6, and the second electric expansion valve 10 is for the degree of supercooling of adjusted cooler 6.The pipeline that subcooler 6 is connected with liquid pipe stop valve 9 is provided with the first temperature sensor 11, and for detecting the temperature of the liquid pipe refrigerant of off-premises station 21 side, its detected value is T
c1.The refrigerant pipeline that oil eliminator 2 is connected with compressor 1 is provided with the high-pressure of pressure high temperature hot gas of the first pressure sensor 12, first pressure sensor 12 for detecting compressor 1 and exporting, and its detected value is Pd.The pipeline that gas-liquid separator 7 is connected with compressor 1 is provided with the second pressure sensor 13.
Indoor set 20 inside is provided with indoor heat converter 14 and the 3rd electric expansion valve 15, the pipeline that indoor heat converter 14 is connected with the 3rd electric expansion valve 15 is provided with the second temperature sensor 16, for detecting the temperature of the liquid pipe refrigerant of indoor set 20 side, its detected value is T
c2.
The specific works process of air-conditioner set is as follows:
During air conditioner refrigerating running, the d end of cross valve 3 is held with c and is conducted, and s end is held with e and is conducted.The high temperature and high pressure gas produced by compressor 1 enters subcooler 6 after flowing through oil eliminator 2, cross valve 3, indoor heat converter 14 and the first electric expansion valve 5 successively, simultaneously, a part of refrigerant after heat exchanger 4 heat exchange outdoor carries out heat exchange by flowing in subcooler 6 after the second electric expansion valve 10 throttling, thus the degree of supercooling of adjusted cooler 6.Indoor set 20 side is flowed into after high-pressure liquid refrigerant after subcooler 6 is excessively cold flows through liquid pipe stop valve 9, after the 3rd electric expansion valve 15 throttling of indoor set 20 inside, flow to indoor heat exchanger evaporation endothermic, be transformed into low-temp low-pressure gaseous coolant, after the refrigerant of last low-temp low-pressure flows through cross valve 3 again, be back in compressor 1.
During air-conditioning heating running, the d end of cross valve 3 is held with e and is conducted, and s end is held with c and is conducted.The high temperature and high pressure gas produced by compressor 1 flow through successively oil eliminator 2, cross valve 3 laggard enter indoor set 20, refrigerant after indoor heat exchanger heat exchange is by flowing into off-premises station 21 after the 3rd electric expansion valve 15 throttling, subcooler 6 is entered after the second electric expansion valve 10 throttling of outdoor heat exchanger, low-temp low-pressure gaseous coolant is become after the refrigerant of cooler outflow flows through outdoor heat exchanger, after last low-temp low-pressure gaseous coolant flows through cross valve 3 again, turn back in compressor 1.
In the process that above-mentioned air conditioner refrigerating running and air-conditioning heating operate, the control method of subcooler 6 is the air-conditioning degree of supercooling control method utilizing pressure sensor hereinafter provided.
The air-conditioning degree of supercooling control device of what this enforcement provided utilize pressure sensor, it comprises above-mentioned air-conditioner set and absolute pressure transducer 22, n the indoor set 20 that described air-conditioner set comprises off-premises station 21 and is connected with described off-premises station 21, n+1 absolute pressure transducer 22 lays respectively on 1 off-premises station 21 and n indoor set 20, be preferably placed at position of centre of gravity or the center of 1 off-premises station 21 and n indoor set 20, also can be that absolute pressure transducer 22 on indoor set 20 is fixed on the position with the 3rd electric expansion valve 15 equal altitudes, the upper absolute pressure transducer 22 of off-premises station 21 is fixed on the position with subcooler 6 equal altitudes.N+1 absolute pressure transducer 22 is all connected with the controller of air-conditioner set, the atmospheric pressure value of collection is fed back in the controller of air-conditioner set.
The air-conditioning degree of supercooling control method of what the present embodiment provided utilize pressure sensor, comprises the steps:
S0: the controller of air-conditioner set is according to the maximum drop Δ H between the detected value calculating off-premises station 21 of n+1 absolute pressure transducer 22 and n indoor set 20
max.
Maximum drop Δ H
maxconcrete computational methods are as follows:
S00: controller is according to the atmospheric pressure detection value of n+1 absolute pressure transducer 22 or height fall Δ H between the mathematic interpolation off-premises station 21 of detected value and n indoor set 20
n.Height fall Δ H
nbasis be, the atmospheric pressure that the object of differing heights bears is inconsistent, if therefore off-premises station 21 and indoor set 20 not at sustained height, the detected value of its barometric absolute pressure is then inconsistent.In Practical Calculation process, there are two kinds of mode computed altitude drop Δ H
n, mode one first calculates the height between off-premises station 21 corresponding to each atmospheric pressure detection value and n indoor set 20, then ask difference in height, and second mode is that first calculating pressure is poor, then pressure differential is converted into difference in height.
S01: controller compares n height fall Δ H
nsize, obtain the maximum drop Δ H between off-premises station 21 and indoor set 20
max, the computing formula of maximum drop is:
ΔH
max＝max{|ΔH
n|}
It should be noted that the maximum drop Δ H in the present embodiment
maxrefer to absolute drop, that is, by this calculating, first to find out with off-premises station 21 apart from indoor set 20 farthest, on this basis the degree of supercooling of air-conditioning is revised.
S1: according to described maximum drop Δ H
maxformula is regulated to revise to the condensation temperature of off-premises station exit refrigerant and/or indoor set exit refrigerant.
Off-premises station 21 outlet is the outlet of subcooler 6.When air conditioner refrigerating, revised by the refrigerant temperature of the exit refrigerant to subcooler 6, when making refrigerant flow to indoor set 20, there is rational degree of supercooling.When air-conditioning heating, by revising the condensation temperature of indoor set exit refrigerant, when making equally to flow to off-premises station 21, there is rational degree of supercooling.
Condensation temperature adjustment formula before correction is:
SC＝T(Pd)-T
c。
Wherein, Pd is the detected value of the first pressure sensor 12, and T (Pd) is the refrigerant condensing temperature value corresponding with detected pressures Pd, that is, each detected pressures Pd all has a refrigerant condensing temperature value corresponding with it, and controller can be determined by the mode such as to table look-up.
When air conditioner refrigerating, SC=SC
1.SC
1for off-premises station 21 exit refrigerant, the i.e. degree of supercooling of subcooler 6 exit refrigerant.T
c=T
c1, T
c1it is the detected value of the first temperature sensor 11.
When air-conditioning heating, SC=SC
2.SC
2for the degree of supercooling of indoor set 20 exit refrigerant.T
c=T
c2, T
c2it is the detected value of the second temperature sensor 16.
Condensation temperature regulates the concrete modification method of formula as follows:
S10: controller is according to maximum drop Δ H
maxcalculate the pressure loss Δ PH that refrigerant flows in pipeline between off-premises station 21 and indoor set 20, account form has two kinds, and mode one is by pre-setting maximum drop Δ H
maxdetermine with the table of comparisons of pressure loss Δ PH, controller obtains maximum drop Δ H by the mode of tabling look-up
maxcorresponding pressure loss Δ PH.Mode two is that controller is directly by maximum drop Δ H
maxcalculate with the relational expression of pressure loss Δ PH, pressure loss Δ PH is positive number.
S11: the result of calculation of pressure loss Δ PH is brought into condensation temperature and regulates in formula by controller, obtains revised condensation temperature and regulates formula;
When air conditioner refrigerating, revised condensation temperature adjustment formula is:
SC
1＝T(Pd±ΔPH)-T
c1（1）
Wherein, Pd is the detected value of the first pressure sensor 12, and T (Pd ± Δ PH) is the refrigerant condensing temperature value corresponding with revised detected pressures Pd ± Δ PH, and SC is the degree of supercooling of subcooler 6 exit refrigerant, T
c1it is the detected value of the first temperature sensor 11.
As shown in Figure 3, when off-premises station 21 is positioned at below indoor set 20, the condensing pressure of off-premises station 21 side can higher than the condensing pressure of indoor set 20 side, the detected value Pd of the first pressure sensor 12 needs to deduct pressure loss Δ PH, to eliminate between the condensing pressure of off-premises station 21 side and the condensing pressure of indoor set 20 side pressure reduction to the impact of degree of supercooling, therefore formula (1) gets negative sign.
As shown in Figure 4, with should off-premises station 21 be positioned at the top of indoor set 20 time, the condensing pressure of off-premises station 21 side can lower than the condensing pressure of indoor set 20 side, therefore formula (1) gets positive sign.In addition, when pressure loss Δ PH signed multiplication operation, the sign in above-mentioned formula can be omitted, direct signed multiplication operation.
When air-conditioning heating, because the flow direction of its refrigerant is just in time contrary with during air conditioner refrigerating, should with the second temperature sensor 16 for detecting starting point, revised condensation temperature adjustment formula is:
Wherein, Pd is the detected value of the first pressure sensor 12, and T (Pd ± Δ PH) is the refrigerant condensing temperature value corresponding with revised detected pressures Pd ± Δ PH, SC
2for the degree of supercooling of indoor set 21 exit refrigerant, T
c2it is the detected value of the second temperature sensor 16.
Accept or reject in like manner with the symbol of formula (1), when off-premises station 21 is positioned at below indoor set 20, formula (2) gets positive sign, and when off-premises station 21 is positioned at the top of indoor set 20, formula (2) gets negative sign.
S2: regulate formula to control off-premises station 20 according to revised condensation temperature and export and/or the degree of supercooling SC of indoor set 21 exit refrigerant.
Concrete control method is as follows:
S21: goal-selling degree of supercooling X and target degree of supercooling Y in the memory of controller inside;
S22: when air conditioner refrigerating, controller regulates formula (1) to regulate the aperture of the second electric expansion valve 10 to control the degree of supercooling SC of subcooler 6 exit refrigerant according to revised condensation temperature
1level off to target degree of supercooling X.
That is, the degree of supercooling SC by regulating the aperture of the second electric expansion valve 10 to make subcooler 6 exit refrigerant
1level off to target degree of supercooling X.By T (Pd ± Δ PH) and T
c1difference, contrast with target degree of supercooling X, draw the aperture whether increasing or reduce the second electric expansion valve 10.If difference is too small, can increase T (Pd ± Δ PH), difference is excessive, can reduce T (Pd ± Δ PH), finally makes T (Pd ± Δ PH) and T
c1difference substantially close to target degree of supercooling X.
In like manner, when air-conditioning heating, controller regulates formula (2) to regulate the aperture of the 3rd electric expansion valve 15 to control the degree of supercooling SC of indoor set 21 opening part refrigerant according to revised condensation temperature
2level off to target degree of supercooling Y.
Known from above-mentioned record, the present invention to export indoor set 21 according to the height fall between off-premises station 21 and indoor set 20 and the condensation temperature of off-premises station 20 exit refrigerant regulates formula to revise, achieve according to height fall the accurate control of degree of supercooling, effectively prevent the abnormal of degree of supercooling and the flash phenomenon caused, ensure the loading sharing between off-premises station 21 and each indoor set 20, thus promote the overall operation efficiency of air-conditioner set.
The present invention is described by preferred embodiment, and those skilled in the art know, without departing from the spirit and scope of the present invention, can carry out various change or equivalence replacement to these characteristic sum embodiments.The present invention is not by the restriction of specific embodiment disclosed herein, and other embodiments fallen in the claim of the application all belong to the scope of protection of the invention.
Claims (5)
1. utilize an air-conditioning degree of supercooling control method for pressure sensor, n the indoor set that described air-conditioning comprises off-premises station and is connected with described off-premises station, it is characterized in that:
Described off-premises station and n described indoor set are equipped with n+1 absolute pressure transducer;
Described air-conditioning degree of supercooling control method comprises the steps:
S0: calculate the maximum drop Δ H between described off-premises station and described indoor set according to the detected value of n+1 absolute pressure transducer
max;
S1: according to described maximum drop Δ H
maxformula is regulated to revise to the condensation temperature of described off-premises station outlet and/or described indoor set exit refrigerant;
S2: regulate formula to control the degree of supercooling SC of the outlet of described off-premises station and/or described indoor set exit refrigerant according to revised condensation temperature.
2. the air-conditioning degree of supercooling control method utilizing pressure sensor according to claim 1, is characterized in that:
Described condensation temperature regulates the modification method of formula as follows:
S10: according to described maximum drop Δ H
maxcalculate the pressure loss Δ PH that refrigerant flows in pipeline between described off-premises station and described indoor set;
S11: the result of calculation of described pressure loss Δ PH is brought into described condensation temperature and regulates in formula, obtains described revised condensation temperature and regulates formula;
When described air conditioner refrigerating, the condensation temperature adjustment formula of revised described off-premises station exit refrigerant is:
SC
1＝T(Pd±ΔPH)-T
c11
When described air-conditioning heating, the condensation temperature adjustment formula of revised described indoor set exit refrigerant is:
When described off-premises station is positioned at below described indoor set, formula 1 gets negative sign, and formula 2 gets positive sign; When described off-premises station is positioned at the top of described indoor set, formula 1 gets positive sign, and formula 2 gets negative sign.
3. the air-conditioning degree of supercooling control method utilizing pressure sensor according to claim 1, is characterized in that:
Described maximum drop Δ H
maxcomputational methods as follows:
S00: height fall Δ H between off-premises station and n described indoor set according to the atmospheric pressure detection value of a described n+1 absolute pressure transducer or the mathematic interpolation of detected value
n;
S01: compare n described height fall Δ H
nsize, obtain the maximum drop Δ H between described off-premises station and described indoor set
max, the computing formula of described maximum drop is:
ΔH
max＝max{|ΔH
n|}。
4. the air-conditioning degree of supercooling control method utilizing pressure sensor according to claim 2, is characterized in that:
Step S2 implements as follows:
S21: goal-selling degree of supercooling X and target degree of supercooling Y;
S22: when described air conditioner refrigerating, regulates formula 1 to regulate the aperture of the second electric expansion valve to control the degree of supercooling SC of described off-premises station exit refrigerant according to revised condensation temperature
1level off to target degree of supercooling X;
When described air-conditioning heating, according to revised condensation temperature regulate formula 2 regulate the aperture of the 3rd electric expansion valve control described off-premises station exit refrigerant degree of supercooling SC
2level off to target degree of supercooling Y.
5. the air-conditioning degree of supercooling control method utilizing pressure sensor according to claim 1, is characterized in that:
A described n+1 absolute pressure transducer lays respectively at the position of centre of gravity of described off-premises station and n described indoor set.
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| CN110686373A (en) * | 2019-08-27 | 2020-01-14 | 珠海格力电器股份有限公司 | Control method of outdoor unit fan and air conditioner |
| CN110762738A (en) * | 2019-11-08 | 2020-02-07 | 宁波奥克斯电气股份有限公司 | Multi-split protocol conversion control method, device and system and air conditioning system |
| EP3764012A4 (en) * | 2018-04-09 | 2021-05-05 | Gree Electric Appliances, Inc. of Zhuhai | High pressure drop control method for unit, apparatus, and air-conditioning device |
| CN112771315A (en) * | 2018-09-28 | 2021-05-07 | 三菱电机株式会社 | Air conditioner |
| CN114198807A (en) * | 2021-11-19 | 2022-03-18 | 青岛海尔空调电子有限公司 | Self-adaptive control method and device for multi-connected air conditioning unit, air conditioning unit and medium |
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