CN102278804A - Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit - Google Patents

Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit Download PDF

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Publication number
CN102278804A
CN102278804A CN2011102550604A CN201110255060A CN102278804A CN 102278804 A CN102278804 A CN 102278804A CN 2011102550604 A CN2011102550604 A CN 2011102550604A CN 201110255060 A CN201110255060 A CN 201110255060A CN 102278804 A CN102278804 A CN 102278804A
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refrigerant
heat exchanger
indoor
indoor set
aperture
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CN2011102550604A
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CN102278804B (en
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郑坚江
侯丽峰
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Abstract

The invention discloses a control method for preventing bias flow of refrigerants during heating of a multi-connected air conditioning unit. The method comprises the following steps of: a, starting the multi-connected air conditioning unit; b, measuring a middle temperature T0 of an indoor heat exchanger (2), wherein an indoor machine of which the T0 is the highest has the most refrigerants, and the indoor machine of which the T0 is the lowest has the fewest refrigerants; c, measuring an outlet temperature T1min of the indoor heat exchanger (2) of the indoor machine which has the fewest refrigerants, measuring an outlet temperature T1max of the indoor heat exchanger (2) of the indoor machine which has the most refrigerants, and calculating a difference value delta T between the T1min and the T1max; d, judging whether the delta T is more than or equal to 5, if so, increasing the aperture of an indoor machine electronic expansion valve (4) of the indoor machine which has the fewest refrigerants, and decreasing the aperture of the indoor machine electronic expansion valve (4) of the indoor machine which has the most refrigerants; and e, repeating the steps b to d at certain intervals until the multi-connected air conditioning unit is shut down. By the method, heating effect of each indoor machine is better, and waste is avoided.

Description

When heating, VRF Air Conditioning System prevents the control method of refrigerant bias current
Technical field
The present invention relates to VRF Air Conditioning System, specifically is the control method that a kind of VRF Air Conditioning System prevents the refrigerant bias current when heating.
Background technology
The VRF Air Conditioning System of prior art comprises one or more off-premises stations, a plurality of indoor set parallel with one another and two refrigerant circulation house stewards that connect each indoor set and each off-premises station.If off-premises station is one, this off-premises station is communicated with a plurality of indoor sets after the parallel connection by two refrigerants circulation house stewards; If off-premises station is a plurality of, then a plurality of off-premises station parallel connections, the off-premises station after the parallel connection is communicated with indoor set after the parallel connection by two refrigerants circulation house stewards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being evaporimeter during heating mode), throttling arrangement, reservoir and gas-liquid separator.Compressor outlet is communicated with an end of oil eliminator, the other end of oil eliminator is communicated with first valve port of four-way change-over valve, the 3rd valve port of four-way change-over valve is communicated with a refrigerant pipe among two refrigerants circulation house stewards, another root refrigerant pipe among two refrigerants circulation house steward is communicated with an end of reservoir, one end of the other end throttling arrangement of reservoir is communicated with, the other end of throttling arrangement is communicated with an end of outdoor heat exchanger, the other end of outdoor heat exchanger is communicated with second valve port of four-way change-over valve, the 4th valve port of four-way change-over valve is connected with an end of gas-liquid separator, and the other end of gas-liquid separator is communicated with the suction port of compressor.During heating mode, first valve port of four-way change-over valve is communicated with the 3rd valve port, and second valve port is communicated with the 4th valve port, and promptly refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, this route circulation of compressor.
Organic electronic expansion valve and indoor heat exchanger (being condenser during heating mode) in each indoor set comprises, one end of indoor heat exchanger is communicated with an end of interior organic electronic expansion valve, one among the other end of interior organic electronic expansion valve and the two refrigerants circulation house stewards is communicated with, and another root refrigerant pipe that the other end of indoor heat exchanger and two refrigerants circulate among the house stewards is communicated with.The inlet of indoor heat exchanger, middle part and outlet are respectively equipped with three temperature sensors.Three above-mentioned temperature sensors and interior organic electronic expansion valve all are electrically connected with the air-conditioning master controller.
Multi-connected air conditioner comprises a plurality of indoor sets, mostly be 64 indoor sets most, and each indoor set is different with the distance of off-premises station, so air-conditioning long-time running, more with off-premises station apart from the refrigerant of near indoor set, less with the indoor-unit cooling-medium of off-premises station distance, refrigerant bias current phenomenon promptly appears.In case refrigerant bias current, the more off-premises station of refrigerant are piled up refrigerant and too much caused waste, and the heating effect of the less indoor set of refrigerant is very poor, and can't guarantee that this defective of heating effect of each indoor set can have a strong impact on the promotion and application of multi-connected air conditioner.
Summary of the invention
The technical problem to be solved in the present invention is, the control method of refrigerant bias current is provided when providing a kind of heating effect that had not only guaranteed each indoor set all better but also can wasting VRF Air Conditioning System not heat.
Technical solution of the present invention is, the control method of refrigerant bias current is provided when providing a kind of VRF Air Conditioning System to heat, and its concrete steps are as follows:
A, with the compressor of off-premises station start operation a period of time;
The temperature T at the indoor heat exchanger middle part of each indoor set of temperature sensor measurement at b, the middle part of the indoor heat exchanger by each indoor set 0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger middle part 0The highest indoor set is the maximum indoor set of refrigerant, the temperature T at indoor heat exchanger middle part 0Minimum indoor set is the minimum indoor set of refrigerant;
The temperature T of the outlet of the indoor heat exchanger of this indoor set of temperature sensor measurement of the outlet of c, the indoor heat exchanger by the minimum indoor set of refrigerant 1min, the temperature T of the outlet of the indoor heat exchanger of this indoor set of temperature sensor measurement of the outlet of the indoor heat exchanger by the maximum indoor set of refrigerant 1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T 1maxDeduct T 1minDifference △ T;
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
This controlling party ratio juris is: the ratio maximum of the refrigerant of the condensation in the indoor heat exchanger of the indoor set that refrigerant is minimum, cooling extent are also maximum, so the middle part temperature T of the indoor heat exchanger of this indoor set 0Minimum; In like manner, the ratio minimum of the refrigerant of condensation in the indoor heat exchanger of the indoor set that refrigerant is maximum, cooling extent is also minimum, so the middle part temperature T of the indoor heat exchanger of this indoor set 0The highest; So with T 0The aperture of the interior organic electronic expansion valve of minimum indoor set increases, with T 0The interior organic electronic expansion valve opening of the highest indoor set reduces, and just can regulate the bias current phenomenon of each indoor set.
Adopt above method, VRF Air Conditioning System of the present invention prevents the refrigerant bias current when heating control method compared with prior art has the following advantages:
After this air-conditioning unit operation a period of time, just can increase the cold medium flux of the minimum indoor set of refrigerant at regular intervals, reduce the cold medium flux of the maximum indoor set of refrigerant, be about to the cold medium flux balance of two the most serious indoor sets of bias current, like this, after repeatedly regulating, can effectively alleviate and improve the bias current phenomenon, make coolant quantity equilibrium in each indoor set, avoid the more indoor set of refrigerant to cause waste, the more important thing is the drawback of avoiding the less indoor set heating effect difference of refrigerant, make that the heating effect of each indoor set is all good, promote the promotion and application of VRF Air Conditioning System.
As improvement, described a period of time of step a is meant 10 ~ 30 minutes, be that compressor operating begins to regulate the bias current phenomenon after 10 ~ 30 minutes, because this VRF Air Conditioning System after operation a period of time, just begins to occur the bias current phenomenon, by evidence, it is more accurate that 10 ~ 30 minutes these time periods began to regulate, and too early regulates, and bias current can not occur, need not regulate, the heating effect difference that causes of the words bias current of Tiao Jieing has caused harmful effect too late.
As improving again, described a period of time of step a is meant 15 minutes, be that compressor operating begins to regulate the bias current phenomenon after 15 minutes, prove by repetition test, this time point was the most accurate in 15 minutes, too early regulated, and bias current can not occur, need not regulate, the heating effect difference that causes of the words bias current of Tiao Jieing has caused harmful effect too late.
As also improving, the described aperture of steps d reduces to be meant, any one is several with original aperture multiply by between 0.9 ~ 0.95; The described aperture of steps d increases and is meant, any one is several with original aperture multiply by between 1.05 ~ 1.1; By evidence, originally any one number of multiply by in 0.9 ~ 0.95 this scope of aperture is turned the maximum indoor set of refrigerant down, and effect is more satisfactory; Equally, originally any one number of multiply by in 1.05 ~ 1.1 these scopes of aperture increases the less indoor set of refrigerant, and effect is more satisfactory.
As further improvement, the described aperture of steps d reduces to be meant, multiply by 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by 1.05 with original aperture; Prove that by repetition test originally 0.95 of aperture turn the maximum indoor set of refrigerant down, effect is the most desirable; Equally, originally 1.05 of aperture increase the less indoor set of refrigerant, and effect is the most desirable.
As further improvement, described a period of time of step e is meant 10 ~ 30 seconds, promptly each regulate be spaced apart 10 ~ 30 seconds any one time in the scope, better to the regulating effect of bias current, this draws through overtesting, if regulate too frequently, there is no need; If regulate number of times very little, the dynamics that bias current is regulated is not enough.
As also further improving, described a period of time of step e is meant 15 seconds, and promptly every interval was regulated once in 15 seconds, and best to the regulating effect of bias current, this draws through repetition test, if adjusting is too frequent, there is no need; If regulate number of times very little, the dynamics that bias current is regulated is not enough.
Description of drawings
Fig. 1 is the systematic schematic diagram that VRF Air Conditioning System of the present invention prevents the control method of refrigerant bias current when heating.
Shown in the figure 1, compressor, 2, indoor heat exchanger, 3, temperature sensor, 4, interior organic electronic expansion valve.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, VRF Air Conditioning System of the present invention prevents the control method of refrigerant bias current when heating, and its concrete steps are as follows:
A, with compressor 1 start operation a period of time of off-premises station, specifically be meant compressor start operation a period of time of any one off-premises station of this VRF Air Conditioning System.
Described a period of time of step a is meant 10 ~ 30 minutes, preferred 15 minutes.
The temperature sensor 3 at b, indoor heat exchanger 2 middle parts by each indoor set is measured the temperature T at indoor heat exchanger 2 middle parts of each indoor set 0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger 2 middle parts 0The highest indoor set is the maximum indoor set of refrigerant, the temperature T at indoor heat exchanger 2 middle parts 0Minimum indoor set is the minimum indoor set of refrigerant.
The particular location at indoor heat exchanger 2 middle parts in this step is meant, the mid-length point of the coil pipe in the indoor heat exchanger 2, and the temperature sensor in this step is located in this position, and the temperature value of this position of measuring is T 0
The temperature sensor 3 of the outlet of c, the indoor heat exchanger 2 by the minimum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger 2 of these indoor sets 1min, the temperature sensor 3 of the outlet of the indoor heat exchanger 2 by the maximum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger 2 of these indoor sets 1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T 1maxDeduct T 1minDifference △ T.
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve 4 of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve 4 of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate.
The described aperture of steps d reduces to be meant, multiply by any one number between 0.9 ~ 0.95 with original aperture, preferably multiply by 0.95; The described aperture increase of steps d is meant, with original aperture multiply by between 1.05 ~ 1.1 any one the number, preferably multiply by 1.05, during as heating mode, the aperture of the interior organic electronic expansion valve 4 of each indoor set generally all was 350 steps, so, the aperture of the interior organic electronic expansion valve 4 of the indoor set of the less needs increase of refrigerant aperture is 350 steps to multiply by 1.05, roughly be 368 the step, and the more needs of refrigerant reduce the aperture of the indoor electric expansion valve 4 of aperture be 120 the step multiply by 0.95, roughly be 332 the step.
E, every certain interval of time, repeating step b ~ d, until shutdown, 10 ~ 30 seconds any one interior time of this scope of the certain interval of time preferred interval in this step, preferred 15 seconds.

Claims (7)

1. prevent the control method of refrigerant bias current when a VRF Air Conditioning System heats, it is characterized in that: its concrete steps are as follows:
A, with the compressor (1) of off-premises station start operation a period of time;
The temperature sensor (3) at b, the middle part of the indoor heat exchanger (2) by each indoor set is measured the temperature T at indoor heat exchanger (2) middle part of each indoor set 0, temperature-measuring results is sent to the air-conditioning master controller, the temperature T at indoor heat exchanger (2) middle part 0The highest indoor set is the maximum indoor set of refrigerant, the temperature T at indoor heat exchanger (2) middle part 0Minimum indoor set is the minimum indoor set of refrigerant;
The temperature sensor (3) of the outlet of c, the indoor heat exchanger (2) by the minimum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger (2) of this indoor set 1min, the temperature sensor (3) of the outlet of the indoor heat exchanger (2) by the maximum indoor set of refrigerant is measured the temperature T of outlet of the indoor heat exchanger (2) of this indoor set 1max, above-mentioned two temperature values are passed to the air-conditioning master controller, and calculate T 1maxDeduct T 1minDifference △ T;
D, whether judge △ T more than or equal to 5, if the aperture of the interior organic electronic expansion valve (4) of then that refrigerant is minimum indoor set increases, the aperture of the interior organic electronic expansion valve (4) of simultaneously that refrigerant is maximum indoor sets reduces; If not, then do not regulate;
E, every certain interval of time, repeating step b ~ d is until shutdown.
2. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when heating, it is characterized in that: described a period of time of step a is meant 10 ~ 30 minutes.
3. VRF Air Conditioning System according to claim 2 prevents the control method of refrigerant bias current when heating, it is characterized in that: described a period of time of step a is meant 15 minutes.
4. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when heating, it is characterized in that: the described aperture of steps d reduces to be meant, multiply by any one number between 0.9 ~ 0.95 with original aperture; The described aperture of steps d increases and is meant, any one is several with original aperture multiply by between 1.05 ~ 1.1.
5. VRF Air Conditioning System according to claim 4 prevents the control method of refrigerant bias current when heating, it is characterized in that: the described aperture of steps d reduces to be meant, multiply by 0.95 with original aperture; The described aperture increase of steps d is meant, multiply by 1.05 with original aperture.
6. VRF Air Conditioning System according to claim 1 prevents the control method of refrigerant bias current when heating, it is characterized in that: described a period of time of step e is meant 10 ~ 30 seconds.
7. VRF Air Conditioning System according to claim 6 prevents the control method of refrigerant bias current when heating, it is characterized in that: described a period of time of step e is meant 15 seconds.
CN 201110255060 2011-08-31 2011-08-31 Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit Active CN102278804B (en)

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Cited By (11)

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CN102914026A (en) * 2012-09-20 2013-02-06 宁波奥克斯电气有限公司 Control method for preventing refrigerant of outdoor unit of multi-linkage air conditioning unit from deflecting during heating
CN104006445A (en) * 2013-02-26 2014-08-27 珠海格力电器股份有限公司 Multi-linkage air conditioner and control method thereof
CN104105927A (en) * 2012-02-09 2014-10-15 日立空调·家用电器株式会社 Air conditioner
CN105865096A (en) * 2016-04-29 2016-08-17 宁波奥克斯电气股份有限公司 Method and unit for improving heating effect of multi-connected machine set
CN108006909A (en) * 2017-11-21 2018-05-08 广东美的暖通设备有限公司 Control method for electronic expansion valve under multi-line system and its heating mode
CN108019892A (en) * 2017-11-23 2018-05-11 青岛海尔空调电子有限公司 The control method of multi-connected air conditioning system
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
CN110186145A (en) * 2019-06-14 2019-08-30 宁波奥克斯电气股份有限公司 A kind of modified control method of the high drop of multi-connected machine, device and air conditioner
CN110594991A (en) * 2019-08-30 2019-12-20 青岛海尔空调器有限总公司 Heating bias flow control method and system for multi-split air conditioner and multi-split air conditioner system
CN112368518A (en) * 2018-07-18 2021-02-12 三菱电机株式会社 Air conditioner and air conditioning method
WO2021212966A1 (en) * 2020-04-22 2021-10-28 青岛海尔空调电子有限公司 Multi-split air conditioning system, and refrigerant flow control method therefor

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104105927A (en) * 2012-02-09 2014-10-15 日立空调·家用电器株式会社 Air conditioner
CN104105927B (en) * 2012-02-09 2016-10-12 江森自控日立空调技术(香港)有限公司 Air conditioner
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CN102914026A (en) * 2012-09-20 2013-02-06 宁波奥克斯电气有限公司 Control method for preventing refrigerant of outdoor unit of multi-linkage air conditioning unit from deflecting during heating
CN102914026B (en) * 2012-09-20 2015-06-17 宁波奥克斯电气有限公司 Control method for preventing refrigerant of outdoor unit of multi-linkage air conditioning unit from deflecting during heating
CN104006445A (en) * 2013-02-26 2014-08-27 珠海格力电器股份有限公司 Multi-linkage air conditioner and control method thereof
CN104006445B (en) * 2013-02-26 2017-04-12 珠海格力电器股份有限公司 Multi-linkage air conditioner and control method thereof
CN105865096A (en) * 2016-04-29 2016-08-17 宁波奥克斯电气股份有限公司 Method and unit for improving heating effect of multi-connected machine set
CN108006909A (en) * 2017-11-21 2018-05-08 广东美的暖通设备有限公司 Control method for electronic expansion valve under multi-line system and its heating mode
CN108006909B (en) * 2017-11-21 2020-05-08 广东美的暖通设备有限公司 Multi-split air conditioning system and control method of electronic expansion valve in heating mode of multi-split air conditioning system
CN108019892A (en) * 2017-11-23 2018-05-11 青岛海尔空调电子有限公司 The control method of multi-connected air conditioning system
CN108019892B (en) * 2017-11-23 2020-11-20 青岛海尔空调电子有限公司 Control method of multi-connected air conditioning system
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
CN112368518A (en) * 2018-07-18 2021-02-12 三菱电机株式会社 Air conditioner and air conditioning method
CN112368518B (en) * 2018-07-18 2022-03-01 三菱电机株式会社 Air conditioner and air conditioning method
CN110186145A (en) * 2019-06-14 2019-08-30 宁波奥克斯电气股份有限公司 A kind of modified control method of the high drop of multi-connected machine, device and air conditioner
CN110594991A (en) * 2019-08-30 2019-12-20 青岛海尔空调器有限总公司 Heating bias flow control method and system for multi-split air conditioner and multi-split air conditioner system
WO2021212966A1 (en) * 2020-04-22 2021-10-28 青岛海尔空调电子有限公司 Multi-split air conditioning system, and refrigerant flow control method therefor

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