CN100561064C - Multi-connected air conditioning system heat the degree of supercooling control method - Google Patents
Multi-connected air conditioning system heat the degree of supercooling control method Download PDFInfo
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- CN100561064C CN100561064C CNB200410039048XA CN200410039048A CN100561064C CN 100561064 C CN100561064 C CN 100561064C CN B200410039048X A CNB200410039048X A CN B200410039048XA CN 200410039048 A CN200410039048 A CN 200410039048A CN 100561064 C CN100561064 C CN 100561064C
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Abstract
The invention provides the control method that a kind of multi-connected air conditioning system heats degree of supercooling, during the air-conditioning system heating operation, indoor set receive that controller transmits heat signal after, each indoor set electric expansion valve enters the benchmark aperture, off-premises station is judged the total capacity A of operation indoor set automatically, determine the initial launch state, and send the information such as parameter, total capacity A and environment temperature of self-operating to each indoor set; The information that each indoor set transmits according to off-premises station is determined the target temperature T20 of self, and the electric expansion valve of each indoor set begins to adjust automatically the aperture of electric expansion valve from the benchmark aperture according to the target temperature T20 that self determines.The target temperature T20 that self sets has guaranteed the cold-producing medium distributed uniform and the effective degree of supercooling of each indoor set, accurate electronic Expansion Valve Control has guaranteed the accuracy that degree of supercooling is regulated, thereby outside unit capacity effectively mates in making, compressor efficiently turns round, and then makes whole system stable operation and energy-efficient.
Description
Technical field
The present invention relates to the control technology field of multi-connected air conditioner, more particularly, the present invention relates in the heating operation multi-connected air conditioning system heat the degree of supercooling regulation technology.
Background technology
At present, for improve energy efficiency, reduce cost be extensive use of with one drag many, drag the multi-connected air conditioning system that mostly is main more, in these existing multi-connected air conditioning systems, when heating operation, generally the electric expansion valve of indoor set is made as fixedly aperture, and carry out the control of refrigerant flow by the electric expansion valve of off-premises station, heat the purpose of (refrigeration) to reach.Yet, the fixedly control of aperture of this indoor set electric expansion valve, can not guarantee the effective cold excessively of cold-producing medium, more can not guarantee the cold-producing medium distributed uniform, thereby make the heating effect of each indoor set inhomogeneous, the temperature drift at place, suction port of compressor, the ability of compressor can not be not fully exerted, cause compressor efficiency to reduce, system's fluctuation of service, the problem that increase power consumption, wastes energy.
In order to address the above problem, in patent documentation CN1275700, JPH08-145482A etc., all adopted the method for regulating degree of supercooling by electric expansion valve in the conditioning chamber, thereby under the situation that the service ability of indoor set and off-premises station is complementary, adjusting by accurate indoor electric expansion valve, guarantee the effective cold excessively of cold-producing medium, reached the purpose of system stable operation.
Yet; existing by conditioning chamber in electric expansion valve regulate in the method for degree of supercooling; because only the indoor set to temperature detector on (unlatching) carries out the adjusting of electric expansion valve; and the electric expansion valve that makes the indoor set of temperature detector off (closing) keeps former aperture; so; under the situation that machine moves in little; because of the ability of indoor set working capacity much smaller than off-premises station; make compressor outlet side pressure at expulsion too high; even cause system out of service because of high voltage protective; thereby can't make system stable operation, reduce the efficient of system's operation.
Summary of the invention
Shortcoming for the control method that heats degree of supercooling that overcomes above-mentioned air-conditioning system, the invention provides the control method that a kind of multi-connected air conditioning system heats degree of supercooling, thereby pass through the aperture of the electric expansion valve of each indoor set of adjusting, even make when machine moves in little, the ability of indoor set and the ability of off-premises station are complementary, the cold-producing medium of each indoor set of flowing through all has certain degree of supercooling, thereby guarantees system stable operation, improves the efficient of compressor.
The invention provides the control method that a kind of multi-connected air conditioning system heats degree of supercooling, it is characterized in that: when heating operation, indoor set receive that controller transmits heat signal after, each indoor set electric expansion valve enters the benchmark aperture; Off-premises station is obtained total capacity A according to the capability code of each indoor set, determines the initial launch state of off-premises station; Regulate the aperture of electric expansion valve of the indoor set of this temperature detector on according to the target temperature value T20 of the indoor set liquid pipe side of temperature detector on (unlatching); More described total capacity A and virtual running critical value B, when judging A 〉=B, make the electric expansion valve of the indoor set of temperature detector off (closing) keep the benchmark aperture constant, when judging A＜B, make the indoor set of temperature detector off enter virtual operation mode, regulate the aperture of electric expansion valve of the indoor set of this temperature detector off according to the target temperature value T20 of the indoor set liquid pipe side of this temperature detector off.
Here, described virtual running critical value B is 8.0HP.
And the benchmark aperture of the indoor set of described temperature detector on is 350 pulses, and the benchmark aperture of the indoor set of described temperature detector off is 65 pulses.
Among the present invention, the target temperature T20 value of described each indoor set is following definite according to the pressure at expulsion Pd value that records in the compressor outlet side, that is:
During Pd 〉=2.0MPa, target temperature value T20 is 51 ℃;
2.0MPa during＞Pd 〉=1.9MPa, target temperature T20 value is 48 ℃:
1.9MPa during＞Pd 〉=1.8MPa, target temperature T20 value is 46 ℃:
1.8MPa during＞Pd 〉=1.7MPa, target temperature T20 value is 44 ℃;
1.7MPa during＞Pd 〉=1.6MPa, target temperature T20 value is 40 ℃;
1.6MPa during＞Pd 〉=1.5MPa, target temperature T20 value is 38 ℃;
1.5MPa during＞Pd 〉=1.4MPa, target temperature T20 value is 35 ℃;
1.4MPa during＞Pd 〉=1.3MPa, target temperature T20 value is 32 ℃;
1.3MPa during＞Pd 〉=1.2MPa, target temperature T20 value is 30 ℃:
1.2MPa during＞Pd 〉=1.1MPa, target temperature T20 value is 30 ℃;
1.1MPa during＞Pd, target temperature T20 value is 30 ℃.
In the present invention, detect the actual temperature T2 of each indoor set liquid pipe side in real time, and according to the difference DELTA T of described observed temperature T2 and target temperature T20, the aperture of following each indoor electric expansion valve of adjusting, that is:
During Δ T＜-8 ℃, electronic expansion valve opening on current aperture, add 10 pulses/time;
During-8 ℃≤Δ T＜-6 ℃, electronic expansion valve opening on current aperture, add 8 pulses/time;
During-6 ℃≤Δ T＜-5 ℃, electronic expansion valve opening on current aperture, add 6 pulses/time;
During-5 ℃≤Δ T＜-3 ℃, electronic expansion valve opening on current aperture, add 5 pulses/time;
During-3 ℃≤Δ T＜-2 ℃, electronic expansion valve opening on current aperture, add 3 pulses/time;
During-2 ℃≤Δ T＜-1 ℃, electronic expansion valve opening on current aperture, add 2 pulses/time;
During-1 ℃≤Δ T＜0 ℃, electronic expansion valve opening on current aperture, add 1 pulse/time;
In the time of Δ T=0 ℃, the aperture of electric expansion valve remains unchanged;
During 0 ℃≤Δ T＜1 ℃, electronic expansion valve opening on current aperture, subtract 1 pulse/time;
During 1 ℃≤Δ T＜2 ℃, electronic expansion valve opening on current aperture, subtract 2 pulses/time;
During 2 ℃≤Δ T＜3 ℃, electronic expansion valve opening on current aperture, subtract 3 pulses/time:
During 3 ℃≤Δ T＜5 ℃, electronic expansion valve opening on current aperture, subtract 5 pulses/time;
During 5 ℃≤Δ T＜6 ℃, electronic expansion valve opening on current aperture, subtract 6 pulses/time;
During 6 ℃≤Δ T＜8 ℃, electronic expansion valve opening on current aperture, subtract 8 pulses/time;
During Δ T 〉=8 ℃, electronic expansion valve opening on current aperture, subtract 10 pulses/time.
Description of drawings
Fig. 1 drags the circular chart of three air-conditioning systems when heating operation.
Fig. 2 is the adjusting flow chart that heats degree of supercooling of the embodiment of the invention.
The specific embodiment
In order to help to understand the present invention, below, with reference to accompanying drawing 1,2, embodiments of the invention are described, but protection scope of the present invention is not limited to this embodiment.
Fig. 1 drags the circular chart of three air-conditioning systems when heating operation, only shows here with degree of supercooling of the present invention and regulates relevant part.Off-premises station 1, indoor set 2a, 2b, 2c and indoor electric expansion valve 3a, the 3b, the 3c ring-type that are installed in indoor set liquid pipe side link to each other.On the tracheae of the close compressor of outdoor compressor outlet side, pressure sensor 5 is installed, is used to detect pressure at expulsion.Between the heat exchanger of each indoor set 2a, 2b, 2c and indoor electric expansion valve 3a separately, 3b, 3c, liquid pipe temperature sensor 4a, 4b, 4c are installed, are used to detect the refrigerant temperature of indoor set outlet side.The flow direction of cold-producing medium when solid arrow is illustrated in heating operation among the figure.Fig. 2 is the adjusting flow process skeleton diagram that heats degree of supercooling of the embodiment of the invention.
Multi-connected air conditioning system is when heating operation, the electric expansion valve 3a of the indoor set 2a of temperature detector on enters 350 pulses of benchmark aperture, electric expansion valve 3b, the 3c of indoor set 2b, the 2c of temperature detector off enters benchmark aperture 65 pulses (the benchmark aperture of the indoor set of different abilities may be different), and each indoor set is to off-premises station transmitting capacity code simultaneously.The capability code that off-premises station sends according to indoor set is obtained capability code summation A (below abbreviate total capacity A as), determine the initial operation state of self, to send each indoor set 2a, 2b, 2c to by current high-pressure Pd, total capacity A and the initial launch state that pressure sensor 5 detects; Indoor set 2a, 2b, 2c began the adjusting of degree of supercooling in 5 minutes later at compressor start.
The indoor set 2a of temperature detector on is according to the value of the high-pressure Pd automatic setting target temperature T20a of off-premises station, that is:
During Pd 〉=2.0MPa, target temperature value T20 is 51 ℃;
2.0MPa during＞Pd 〉=1.9MPa, target temperature T20 value is 48 ℃:
1.9MPa during＞Pd 〉=1.8MPa, target temperature T20 value is 46 ℃:
1.8MPa during＞Pd 〉=1.7MPa, target temperature T20 value is 44 ℃;
1.7MPa during＞Pd 〉=1.6MPa, target temperature T20 value is 40 ℃;
1.6MPa during＞Pd 〉=1.5MPa, target temperature T20 value is 38 ℃;
1.5MPa during＞Pd 〉=1.4MPa, target temperature T20 value is 35 ℃;
1.4MPa during＞Pd 〉=1.3MPa, target temperature T20 value is 32 ℃;
1.3MPa during＞Pd 〉=1.2MPa, target temperature T20 value is 30 ℃:
1.2MPa during＞Pd 〉=1.1MPa, target temperature T20 value is 30 ℃;
1.1MPa during＞Pd, target temperature T20 value is 30 ℃.
Then, detect the liquid pipe outlet temperature T2a of current reality, ask T2a-T20a=Δ T, and the electric expansion valve 3a of the indoor set 2a of temperature detector on is transferred valve, that is: from 350 pulses of benchmark aperture by liquid pipe temperature sensor 4a
During Δ T＜-8 ℃, electronic expansion valve opening on current aperture, add 10 pulses/time;
During-8 ℃≤Δ T＜-6 ℃, electronic expansion valve opening on current aperture, add 8 pulses/time;
During-6 ℃≤Δ T＜-5 ℃, electronic expansion valve opening on current aperture, add 6 pulses/time;
During-5 ℃≤Δ T＜-3 ℃, electronic expansion valve opening on current aperture, add 5 pulses/time;
During-3 ℃≤Δ T＜-2 ℃, electronic expansion valve opening on current aperture, add 3 pulses/time;
During-2 ℃≤Δ T＜-1 ℃, electronic expansion valve opening on current aperture, add 2 pulses/time;
During-1 ℃≤Δ T＜0 ℃, electronic expansion valve opening on current aperture, add 1 pulse/time;
In the time of Δ T=0 ℃, the aperture of electric expansion valve remains unchanged;
During 0 ℃≤Δ T＜1 ℃, electronic expansion valve opening on current aperture, subtract 1 pulse/time;
During 1 ℃≤Δ T＜2 ℃, electronic expansion valve opening on current aperture, subtract 2 pulses/time;
During 2 ℃≤Δ T＜3 ℃, electronic expansion valve opening on current aperture, subtract 3 pulses/time:
During 3 ℃≤Δ T＜5 ℃, electronic expansion valve opening on current aperture, subtract 5 pulses/time;
During 5 ℃≤Δ T＜6 ℃, electronic expansion valve opening on current aperture, subtract 6 pulses/time;
During 6 ℃≤Δ T＜8 ℃, electronic expansion valve opening on current aperture, subtract 8 pulses/time;
During Δ T 〉=8 ℃, electronic expansion valve opening on current aperture, subtract 10 pulses/time.
Below, be example with indoor set 2b, the adjustment process of electric expansion valve of the indoor set of temperature detector off is described.After the indoor set 2b of temperature detector off receives operational factor from off-premises station, at first relatively total capacity A and virtual running critical value B (for example 8.0HP), when judging A 〉=B, former aperture 65 pulses of the indoor set maintenance electric expansion valve of temperature detector off are constant; When judging A＜B, the indoor set 2b of temperature detector off enters virtual operation mode, and the same with the indoor set 2a of temperature detector on, determines that its liquid pipe surveys target temperature T20b, and surveys target temperature T20b according to this liquid pipe electric expansion valve 3b is transferred valve.
Here, the aperture scope of the electric expansion valve 3a of the indoor set 2a of temperature detector on is 50～480 pulses, and the aperture scope of electric expansion valve 3b, the 3c of indoor set 2b, the 2c of temperature detector off is 50～200 pulses.In addition, in the present embodiment, every 20s regulates the once aperture of each indoor electric expansion valve, the corresponding mechanical adjustment action that the aperture that 1., 2. is meant the indoor expansion valve that is right after control section among Fig. 2 is regulated.
According to the present invention, in heating operation, indoor electric expansion valve makes the cold-producing medium distributed uniform by the adjusting of degree of supercooling, and the cold-producing medium that flows through each indoor set is complementary with the ability of each indoor set, has guaranteed the heating effect of each indoor set.Especially, when machine moves in little, enter virtual running by the indoor set that makes temperature detector off, the indoor set of simulation temperature detector on carries out the adjusting of electric expansion valve, make condensation area strengthen, guarantee that the indoor and outdoor machine ability is complementary, thereby the outlet pressure that has prevented the compressor outlet side is too high, avoid stopping of system's operation, effectively guaranteed the stable operation of system.
And, in the present invention, provided the target temperature T20 value of each pressure limit by the thermodynamic behaviour of cold-producing medium, thereby having guaranteed all has certain degree of supercooling from the cold-producing medium that every indoor set flows out, the cold-producing medium total condensation is got off, thereby make that the ability of off-premises station is brought into play to greatest extent.
Claims (5)
1. a multi-connected air conditioning system heats the control method of degree of supercooling, it is characterized in that:
When heating operation, indoor set receive that controller transmits heat signal after, each indoor set electric expansion valve enters the benchmark aperture; Off-premises station is obtained total capacity A according to the capability code of each indoor set, determines the initial launch state of off-premises station;
Regulate the aperture of electric expansion valve of the indoor set of this temperature detector on according to the target temperature T20 of the indoor set liquid pipe side of temperature detector on;
More described total capacity A and virtual running critical value B, when judging A 〉=B, make the electric expansion valve of the indoor set of temperature detector off keep the benchmark aperture constant, when judging A＜B, make the indoor set of temperature detector off enter virtual operation mode, regulate the aperture of electric expansion valve of the indoor set of this temperature detector off according to the target temperature T20 of the indoor set liquid pipe side of temperature detector off.
2. multi-connected air conditioning system as claimed in claim 1 heats the control method of degree of supercooling, it is characterized in that: described virtual running critical value B is 8.0HP.
3. multi-connected air conditioning system as claimed in claim 1 heats the control method of degree of supercooling, it is characterized in that: the benchmark aperture of the indoor set of described temperature detector on is 350 pulses, and the benchmark aperture of the indoor set of described temperature detector off is 65 pulses.
4. multi-connected air conditioning system as claimed in claim 1 heats the control method of degree of supercooling, it is characterized in that: according to the described target temperature T20 value of definite described each indoor set of the pressure at expulsion Pd value that detects in the compressor outlet side, that is:
During Pd 〉=2.0MPa, target temperature value T20 is 51 ℃;
2.0MPa during＞Pd 〉=1.9MPa, target temperature T20 value is 48 ℃:
1.9MPa during＞Pd 〉=1.8MPa, target temperature T20 value is 46 ℃:
1.8MPa during＞Pd 〉=1.7MPa, target temperature T20 value is 44 ℃;
1.7MPa during＞Pd 〉=1.6MPa, target temperature T20 value is 40 ℃;
1.6MPa during＞Pd 〉=1.5MPa, target temperature T20 value is 38 ℃;
1.5MPa during＞Pd 〉=1.4MPa, target temperature T20 value is 35 ℃;
1.4MPa during＞Pd 〉=1.3MPa, target temperature T20 value is 32 ℃;
1.3MPa during＞Pd 〉=1.2MPa, target temperature T20 value is 30 ℃:
1.2MPa during＞Pd 〉=1.1MPa, target temperature T20 value is 30 ℃;
1.1MPa during＞Pd, target temperature T20 value is 30 ℃.
5. multi-connected air conditioning system as claimed in claim 1 heats the control method of degree of supercooling, it is characterized in that: subtract the aperture that the difference DELTA T of target temperature T20 regulates described each indoor electric expansion valve according to the observed temperature T2 of liquid pipe side, that is:
During Δ T＜-8 ℃, electronic expansion valve opening on current aperture, add 10 pulses/time;
During-8 ℃≤Δ T＜-6 ℃, electronic expansion valve opening on current aperture, add 8 pulses/time;
During-6 ℃≤Δ T＜-5 ℃, electronic expansion valve opening on current aperture, add 6 pulses/time;
During-5 ℃≤Δ T＜-3 ℃, electronic expansion valve opening on current aperture, add 5 pulses/time;
During-3 ℃≤Δ T＜-2 ℃, electronic expansion valve opening on current aperture, add 3 pulses/time;
During-2 ℃≤Δ T＜-1 ℃, electronic expansion valve opening on current aperture, add 2 pulses/time;
During-1 ℃≤Δ T＜0 ℃, electronic expansion valve opening on current aperture, add 1 pulse/time;
In the time of Δ T=0 ℃, the aperture of electric expansion valve remains unchanged;
During 0 ℃≤Δ T＜1 ℃, electronic expansion valve opening on current aperture, subtract 1 pulse/time;
During 1 ℃≤Δ T＜2 ℃, electronic expansion valve opening on current aperture, subtract 2 pulses/time;
During 2 ℃≤Δ T＜3 ℃, electronic expansion valve opening on current aperture, subtract 3 pulses/time:
During 3 ℃≤Δ T＜5 ℃, electronic expansion valve opening on current aperture, subtract 5 pulses/time;
During 5 ℃≤Δ T＜6 ℃, electronic expansion valve opening on current aperture, subtract 6 pulses/time;
During 6 ℃≤Δ T＜8 ℃, electronic expansion valve opening on current aperture, subtract 8 pulses/time;
During Δ T 〉=8 ℃, electronic expansion valve opening on current aperture, subtract 10 pulses/time.
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| CNB200410039048XA CN100561064C (en) | 2004-01-20 | 2004-01-20 | Multi-connected air conditioning system heat the degree of supercooling control method |
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| CNB200410039048XA CN100561064C (en) | 2004-01-20 | 2004-01-20 | Multi-connected air conditioning system heat the degree of supercooling control method |
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| CN100561064C true CN100561064C (en) | 2009-11-18 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101176635B1 (en) * | 2007-06-22 | 2012-08-24 | 삼성전자주식회사 | Multi air conditioner capable of heating and cooling simultaneously and control method thereof |
| JP5404487B2 (en) * | 2010-03-23 | 2014-01-29 | 三菱電機株式会社 | Multi-room air conditioner |
| CN102242996B (en) * | 2011-07-05 | 2013-06-12 | 海尔集团公司 | Method for controlling opening of electronic expansion valve in central air-conditioning unit |
| JP5674572B2 (en) * | 2011-07-06 | 2015-02-25 | 三菱電機株式会社 | Air conditioner |
| CN103206750A (en) * | 2013-04-12 | 2013-07-17 | 浙江大学 | Multi-split air conditioning system and status switching control method therefor |
| CN103644621A (en) * | 2013-11-15 | 2014-03-19 | 浙江大学 | Central arithmetic type multi-split air conditioner system and state switching control method thereof |
| CN105276749B (en) * | 2014-06-24 | 2018-01-30 | 青岛海信日立空调系统有限公司 | A kind of control method and device of multi-online air-conditioning system |
| CN105571075B (en) * | 2016-01-20 | 2019-08-20 | 青岛海尔空调电子有限公司 | A kind of control method of water-cooled multi-connected machine return-air increasing enthalpy |
| CN105910357B (en) * | 2016-04-25 | 2018-11-20 | 广东美的暖通设备有限公司 | Air-conditioning system and its valve body control method |
| CN108613336A (en) * | 2018-05-15 | 2018-10-02 | 青岛海尔空调电子有限公司 | It is a kind of for controlling the method and apparatus of air conditioner, air conditioner, computer readable storage medium |
| CN115046289A (en) * | 2022-05-16 | 2022-09-13 | 广东美的制冷设备有限公司 | Control method and control device of multi-split air conditioning system and multi-split air conditioning system |
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