CN102345949A - Refrigerant flow regulating system of multi-connected air-conditioning heat exchanger and regulating method thereof - Google Patents

Refrigerant flow regulating system of multi-connected air-conditioning heat exchanger and regulating method thereof Download PDF

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Publication number
CN102345949A
CN102345949A CN2011102598302A CN201110259830A CN102345949A CN 102345949 A CN102345949 A CN 102345949A CN 2011102598302 A CN2011102598302 A CN 2011102598302A CN 201110259830 A CN201110259830 A CN 201110259830A CN 102345949 A CN102345949 A CN 102345949A
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China
Prior art keywords
heat exchanger
premises station
expansion valve
calculate
station module
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Pending
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CN2011102598302A
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Chinese (zh)
Inventor
张文强
李亚军
丛辉
崔明
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN2011102598302A priority Critical patent/CN102345949A/en
Publication of CN102345949A publication Critical patent/CN102345949A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides a refrigerant flow regulating system of a multi-connected air-conditioning heat exchanger. The opening of an electronic expansion valve at the outlet of the heat exchanger is controlled, and the supercooling degree or superheating degree at the outlet of each heat exchanger is detected and controlled so as to regulate the refrigerant flow of each heat exchanger. The regulating method comprises the following steps: (1) starting the system; (2) acquiring data; (3) calculating the temperature difference; (4) determining whether the temperature difference exceeds the range; (5) calculating the variation value of the electronic expansion valve; and (6) finishing the regulation and operating normally. According to the invention, the refrigerant flow of each heat exchanger is regulated effectively, and the whole refrigerating effect of the air-conditioning system is improved.

Description

A kind of multi-connected air conditioner heat exchanger cold medium flux regulating system and control method thereof
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Technical field
The present invention relates to heat exchanger cold medium flux regulating system, be specifically related to a kind of heat exchanger cold medium flux regulating system and control method thereof that is applicable to multi-connected air conditioner.
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Background technology
At present, VRF Air Conditioning System adopts the module combinations pattern more, and the module combinations pattern has good transportation advantage and combining form flexibly, has progressively become the main force's product on the business air conditioner market.VRF Air Conditioning System is a kind of air-conditioning unit by many outdoor unit parallel connections and many indoor units parallel connections; The combining form of this many off-premises station heat exchangers parallel connection; Make each heat exchanger environment temperature not simultaneously; Condensing pressure is different; Each heat exchanger dispense flow rate is inhomogeneous, and the heat exchanger ability can not be given full play to.
When the running refrigerating pattern, because the liquid refrigerants overwhelming majority that adopts is stored in the off-premises station heat exchanger, it is different to start quantity according to off-premises station, and the coolant quantity of participating in circulation in the unit operation is also inequality.Off-premises station starts quantity for a long time, and the coolant quantity of participating in the circulation is big, and off-premises station starts quantity after a little while, and the coolant quantity of participating in circulation is just few.Therefore, the off-premises station that does not move for a long time can accumulate a large amount of liquid refrigerants in its heat exchanger, when finally causing the whole system operation, the not enough phenomenon of refrigerant circulation occurs, influences unit overall operation performance, indoor set refrigeration variation.
The many online group that are combined to form for the bimodulus piece; Because mounting condition is different; Relatively poor like indivedual off-premises stations installation position near the body of wall radiating effect; At this moment condensing pressure is higher during this off-premises station refrigerating operaton; And other outer machine condensing pressures of combination are lower with it; Each heat exchanger dispense flow rate is inhomogeneous, thereby the heat exchanger ability can not be given full play to.Perhaps; If the installation site, branch pipe place of two modules is out-of-level; Cause the shunting of two off-premises station heat exchangers inhomogeneous; The refrigerant of wherein flowing through in off-premises station is more; And make this off-premises station heat exchanger heat exchange deleterious; The other off-premises station refrigerant of flowing through is less, and this off-premises station heat exchange effect is better.
Costing an arm and a leg of flow sensor; If adopt the refrigerant circulation in the off-premises station heat exchanger in the direct measuring system of flow sensor; Cost is too high; General air-conditioning unit is difficult for adopting; Therefore; Be difficult to directly obtain the cold medium flux parameter of heat exchanger, thereby regulate the cold medium flux in the heat exchanger, reach the purpose that improves air-conditioning system integrally cooling effect.
 
Summary of the invention
Deficiency to the prior art existence; Technical problem to be solved by this invention is; A kind of multi-connected air conditioner heat exchanger cold medium flux regulating system is provided; Adopt the electronic expansion valve opening of control heat exchanger exit; Thereby the degree of supercooling or the degree of superheat that detect and control each heat exchanger exit place are regulated the cold medium flux in each heat exchanger, improve the purpose of air-conditioning system integrally cooling effect.
For solving the problems of the technologies described above; The technical scheme that the present invention taked is that a kind of multi-connected air conditioner heat exchanger cold medium flux regulating system comprises indoor units and outdoor unit; The off-premises station pack module is provided with compressor and heat exchanger, and its heat exchanger port is provided with electric expansion valve.
Above-mentioned multi-connected air conditioner heat exchanger cold medium flux regulating system, its electric expansion valve one end connects heat exchanger exit, other end connected system pipeline.
A kind of multi-connected air conditioner heat exchanger cold medium flux control method may further comprise the steps:
(1) system starts: whole unit start operation of off-premises station module or off-premises station module section compressor emergency shutdown;
(2) image data: after system starts, when the whole unit start of off-premises station module operation, gather condensing pressure, heat exchanger exit place refrigerant temperature; When off-premises station module section compressor emergency shutdown, gather environment temperature, heat exchanger exit place refrigerant temperature;
(3) calculate the temperature difference: when the whole unit start of off-premises station module operation, calculate the heat exchanger degree of supercooling; When off-premises station module section compressor emergency shutdown, calculate the heat exchanger environment degree of superheat;
(4) judge whether ultra scope of the temperature difference: the temperature difference and the preset codomain scope of unit that calculate in the step (2) are compared, go beyond the scope and then carry out next step adjustment, not ultra scope is then remained stationary;
(5) calculate the electric expansion valve changing value: judged result exceeds the preset codomain scope of unit in the step (3), carries out PID and calculates, and draws the changing value of electric expansion valve;
(6) finish adjustment, normal operation.
The present invention adopts the electronic expansion valve opening of control heat exchanger exit, thereby reaches the degree of supercooling purpose of regulating each heat exchanger cold medium flux at each heat exchanger exit place of control.Because of flow sensor expensive; General air-conditioning unit is difficult for adopting; Thereby can't directly obtain the refrigerant flow parameter of heat exchanger; Whether the cold medium flux that the present invention judges this heat exchanger through the degree of supercooling or the degree of superheat at measurement heat exchanger exit place is suitable; When calculating, degree of supercooling adopts the pressure of measuring the condenser inlet place; This pressure can be scaled the condensation temperature of cold-producing medium through cold-producing medium rerum natura table; Simultaneously; Heat collecting exchanger exit temperature; Then condensation temperature deducts the exit temperature, is the degree of supercooling at this place.If the degree of supercooling at heat exchanger exit place is very big, illustrate that then the refrigerant temperature that flows through this heat exchanger is low, refrigerant is through undue cooling, and the internal circulating load in the unit interval reduces; If the degree of supercooling at heat exchanger exit place is very little, then the refrigerant temperature height of this heat exchanger is flow through in explanation, and refrigerant is not through fully cooling, and the unit interval, interior internal circulating load increased.Therefore, through the electronic expansion valve opening in machine heat exchanger exit outside the control room, thereby can reach the purpose that the degree of supercooling of controlling each heat exchanger exit place is regulated each heat exchanger flow.
When each heat exchanger is in because of mounting condition under the varying environment temperature conditions, during internal refrigeration storage agent flux generation bias current, the heat exchanger refrigerant flow that has is big, and the flow that has is little, causes indivedual heat exchanger exchange capability of heat not give full play to.At this moment to the aperture of flow its electric expansion valve of heat exchanger control bigger than normal, its flow is reduced, and less its electronic expansion valve opening of heat exchanger of original flow increases, its flow is increased.
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Description of drawings
Fig. 1 is a system architecture sketch map of the present invention;
Fig. 2 is the control flow chart of embodiment 1;
Fig. 3 is the control flow chart of embodiment 2.
Among the last figure: 1-indoor units, the outdoor unit of 2-, 3-compressor, 4-heat exchanger, 5-cross valve, 6-electric expansion valve, 7-branch pipe.
 
The specific embodiment
Embodiment 1
As shown in Figure 1; The multi-connected air conditioner heat exchanger cold medium flux regulating system of present embodiment; Comprise indoor units 1 and outdoor unit 2; Outdoor unit 2 modules are provided with compressor 3 and heat exchanger 4; Heat exchanger 4 one ends connect cross valve 5; Heat exchanger 4 other ports are provided with electric expansion valve 6, and electric expansion valve 6 one ends connect the outlet of heat exchanger 4, the branch pipe 7 in the other end connected system pipeline.
As shown in Figure 2, the multi-connected air conditioner heat exchanger cold medium flux control method of this enforcement may further comprise the steps:
Step 101 system starts: the whole unit start of off-premises station module operation;
Step 102 image data: gather condensing pressure and the refrigerant temperature Te of heat exchanger exit place;
Step 103 is calculated the temperature difference: calculate the heat exchanger degree of supercooling, try to achieve current heat exchanger degree of supercooling through tabling look-up;
Step 104 is judged whether ultra scope of the temperature difference: the degree of supercooling and the preset codomain scope (as: 4-7 degree) of unit that calculate in the step 103 are compared; Go beyond the scope and then get into step 105 adjustment; Not ultra scope then gets into step 107 and remains stationary, and keeps current electronic expansion valve opening K (n);
Step 105 is calculated the electric expansion valve changing value: carry out PID and calculate, draw the changing value △ K (n) of electric expansion valve;
Step 106 adjustment finishes, normal operation.
Present embodiment makes Te place degree of supercooling reach unit preset value (4-7 degree) through detecting the heat exchanger exit refrigerant temperature Te of place.When certain off-premises station Te place cold value when not arriving preset value, then turn down the corresponding electronic expansion valve opening of this off-premises station heat exchanger, the circulating mass of refrigerant of this heat exchanger of flowing through is reduced, the Te temperature reduces, the increase of Te place degree of supercooling; When certain off-premises station Te place cold value when surpassing preset value, then increase the corresponding electronic expansion valve opening of this off-premises station heat exchanger, the circulating mass of refrigerant of this heat exchanger of flowing through is increased, the Te temperature raises, Te place degree of supercooling reduces.Above process is all adjusted to the degree of supercooling in each off-premises station exit in the preset value scope, thereby makes off-premises station heat exchanger cold medium flux homogenising.
Embodiment 2
The something in common of present embodiment and embodiment 1 repeats no more, and difference is:
As shown in Figure 3, the multi-connected air conditioner heat exchanger cold medium flux control method of this enforcement may further comprise the steps:
Step 201 system starts: off-premises station module section compressor emergency shutdown;
Step 202 image data: gather environment temperature Ta and the refrigerant temperature Te of heat exchanger exit place;
Step 203 is calculated the temperature difference: calculate the heat exchanger environment degree of superheat, that is: the heat exchanger environment degree of superheat=refrigerant temperature Te-of heat exchanger exit place environment temperature Ta;
Step 204 is judged whether ultra scope of the temperature difference: the degree of superheat and the preset codomain scope (as: 2-4 degree) of unit that calculate in the step 203 are compared; Go beyond the scope and then get into step 205 adjustment; Not ultra scope then gets into step 207 and remains stationary, and keeps current electronic expansion valve opening Koff (n);
Step 205 is calculated the electric expansion valve changing value: carry out PID and calculate, draw the changing value △ Koff (n) of electric expansion valve;
Step 206 adjustment finishes, normal operation.
The above only is to preferred embodiment of the present invention, is not to be that the present invention is done other forms of restriction, and any professional and technical personnel of being familiar with possibly utilize the technology contents of above-mentioned announcement to change or be modified as the equivalent embodiment of equivalent variations.But every the present invention program's content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to protection scope of the present invention according to technical spirit of the present invention.

Claims (3)

1. a multi-connected air conditioner heat exchanger cold medium flux regulating system comprises indoor units and outdoor unit, and the off-premises station pack module is provided with compressor and heat exchanger, it is characterized in that: the heat exchanger port is provided with electric expansion valve.
2. multi-connected air conditioner heat exchanger cold medium flux regulating system according to claim 1 is characterized in that: said electric expansion valve one end connects heat exchanger exit, other end connected system pipeline.
3. multi-connected air conditioner heat exchanger cold medium flux control method may further comprise the steps:
(1) system starts: whole unit start operation of off-premises station module or off-premises station module section compressor emergency shutdown;
(2) image data: after system starts, when the whole unit start of off-premises station module operation, gather condensing pressure, heat exchanger exit place refrigerant temperature; When off-premises station module section compressor emergency shutdown, gather environment temperature, heat exchanger exit place refrigerant temperature;
(3) calculate the temperature difference: when the whole unit start of off-premises station module operation, calculate the heat exchanger degree of supercooling; When off-premises station module section compressor emergency shutdown, calculate the heat exchanger environment degree of superheat;
(4) judge whether ultra scope of the temperature difference: the temperature difference and the preset codomain scope of unit that calculate in the step (2) are compared, go beyond the scope and then carry out next step adjustment, not ultra scope is then remained stationary;
(5) calculate the electric expansion valve changing value: judged result exceeds the preset codomain scope of unit in the step (3), carries out PID and calculates, and draws the changing value of electric expansion valve;
(6) finish adjustment, normal operation.
CN2011102598302A 2011-09-05 2011-09-05 Refrigerant flow regulating system of multi-connected air-conditioning heat exchanger and regulating method thereof Pending CN102345949A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103712309A (en) * 2012-10-04 2014-04-09 Tcl空调器(中山)有限公司 Air-conditioner refrigerant flow control method
CN106052216A (en) * 2016-06-29 2016-10-26 宁波奥克斯电气股份有限公司 Method for controlling electronic expansion valves during multi-connected air conditioning unit heating
CN106123227A (en) * 2016-06-28 2016-11-16 广东美的暖通设备有限公司 Multiple on-line system and control method thereof
CN106152633A (en) * 2016-06-28 2016-11-23 广东美的暖通设备有限公司 multiple on-line system and control method thereof
CN106403201A (en) * 2016-11-10 2017-02-15 广东美的暖通设备有限公司 Control method for accumulating liquid of fresh air ventilator heat exchanger of air conditioner and air conditioner
WO2017185733A1 (en) * 2016-04-25 2017-11-02 广东美的暖通设备有限公司 Air conditioning system and valve control method therefor
CN107477821A (en) * 2017-07-26 2017-12-15 美的集团武汉制冷设备有限公司 Air-conditioning system, the control device of air-conditioning system and method
CN108105912A (en) * 2017-12-11 2018-06-01 广东美的暖通设备有限公司 Multi-line system and its anti-refrigerant bias current control method, control device
CN110160231A (en) * 2019-05-29 2019-08-23 广东美的暖通设备有限公司 Valve body control method, indoor unit and computer readable storage medium
CN113587379A (en) * 2021-07-05 2021-11-02 青岛海信日立空调系统有限公司 Air conditioner control system
WO2021218272A1 (en) * 2020-04-26 2021-11-04 青岛海尔空调电子有限公司 Method for controlling opening degree of expansion valve of air conditioning system
CN113944977A (en) * 2021-10-21 2022-01-18 青岛海尔空调电子有限公司 Control method of air conditioning system
CN114440502A (en) * 2020-11-04 2022-05-06 广东美的制冷设备有限公司 Control method for initial opening degree of electronic expansion valve, multi-split air conditioner and storage medium
CN114544157A (en) * 2022-02-16 2022-05-27 青岛海信日立空调系统有限公司 Two-phase flow test bed for shunt
CN115183398A (en) * 2022-07-29 2022-10-14 青岛海尔空调电子有限公司 Air conditioner control method, device, equipment and medium

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103712309A (en) * 2012-10-04 2014-04-09 Tcl空调器(中山)有限公司 Air-conditioner refrigerant flow control method
WO2017185733A1 (en) * 2016-04-25 2017-11-02 广东美的暖通设备有限公司 Air conditioning system and valve control method therefor
CN106123227B (en) * 2016-06-28 2019-02-19 广东美的暖通设备有限公司 Multi-line system and its control method
CN106152633A (en) * 2016-06-28 2016-11-23 广东美的暖通设备有限公司 multiple on-line system and control method thereof
CN106123227A (en) * 2016-06-28 2016-11-16 广东美的暖通设备有限公司 Multiple on-line system and control method thereof
WO2018001183A1 (en) * 2016-06-28 2018-01-04 广东美的暖通设备有限公司 Multi-split system and control method thereof
CN106052216B (en) * 2016-06-29 2018-05-29 宁波奥克斯电气股份有限公司 To the control method of electric expansion valve during a kind of multi-connected machine heating
CN106052216A (en) * 2016-06-29 2016-10-26 宁波奥克斯电气股份有限公司 Method for controlling electronic expansion valves during multi-connected air conditioning unit heating
CN106403201B (en) * 2016-11-10 2019-03-15 广东美的暖通设备有限公司 The control method and air conditioner of the fresh air machine heat exchanger hydrops of air conditioner
CN106403201A (en) * 2016-11-10 2017-02-15 广东美的暖通设备有限公司 Control method for accumulating liquid of fresh air ventilator heat exchanger of air conditioner and air conditioner
CN107477821A (en) * 2017-07-26 2017-12-15 美的集团武汉制冷设备有限公司 Air-conditioning system, the control device of air-conditioning system and method
CN108105912A (en) * 2017-12-11 2018-06-01 广东美的暖通设备有限公司 Multi-line system and its anti-refrigerant bias current control method, control device
CN108105912B (en) * 2017-12-11 2019-11-29 广东美的暖通设备有限公司 Multi-line system and its anti-refrigerant bias current control method, control device
CN110160231A (en) * 2019-05-29 2019-08-23 广东美的暖通设备有限公司 Valve body control method, indoor unit and computer readable storage medium
WO2021218272A1 (en) * 2020-04-26 2021-11-04 青岛海尔空调电子有限公司 Method for controlling opening degree of expansion valve of air conditioning system
CN114440502A (en) * 2020-11-04 2022-05-06 广东美的制冷设备有限公司 Control method for initial opening degree of electronic expansion valve, multi-split air conditioner and storage medium
CN113587379A (en) * 2021-07-05 2021-11-02 青岛海信日立空调系统有限公司 Air conditioner control system
CN113944977A (en) * 2021-10-21 2022-01-18 青岛海尔空调电子有限公司 Control method of air conditioning system
CN114544157A (en) * 2022-02-16 2022-05-27 青岛海信日立空调系统有限公司 Two-phase flow test bed for shunt
CN115183398A (en) * 2022-07-29 2022-10-14 青岛海尔空调电子有限公司 Air conditioner control method, device, equipment and medium
CN115183398B (en) * 2022-07-29 2023-10-20 青岛海尔空调电子有限公司 Air conditioner control method, device, equipment and medium

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Application publication date: 20120208