CN108826582B - Low-temperature heating refrigerant flow matching control method and air conditioner - Google Patents
Low-temperature heating refrigerant flow matching control method and air conditioner Download PDFInfo
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- CN108826582B CN108826582B CN201810404406.4A CN201810404406A CN108826582B CN 108826582 B CN108826582 B CN 108826582B CN 201810404406 A CN201810404406 A CN 201810404406A CN 108826582 B CN108826582 B CN 108826582B
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- expansion valve
- frosting
- electronic expansion
- opening degree
- air conditioner
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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
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a low-temperature heating refrigerant flow matching control method and an air conditioner, and the method comprises the following steps: s1: the air conditioner enters a heating mode, whether defrosting control is performed or not is judged, and if yes, S2: the air conditioner carries out defrosting operation, after defrosting is finished, the electronic expansion valve recovers the initial opening degree, frosting timing is started, and after the frosting timing reaches frosting time, S3: starting valve adjustment timing; s4: when the valve adjusting timing reaches the adjusting time of the expansion valve, the electronic expansion valve closes one step, whether the opening degree of the electronic expansion valve is reduced to the lower limit opening degree is judged, and if not, S5: judging whether to enter defrosting control, if so, S6: the electronic expansion valve keeps the opening degree unchanged; s7: when the condition for entering the defrosting control is reached, step S2 is executed, otherwise step S6 is executed. The invention enables the refrigerant flow rate to be dynamically matched with the heat exchange capacity of the evaporator in the frosting process, improves the low-temperature heating capacity, prolongs the frosting period, reduces the energy consumption, reduces the noise pollution and improves the use comfort.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a low-temperature heating refrigerant flow matching control method and an air conditioner.
Background
The flow control of the low-temperature heating electronic expansion valve of the conventional variable-frequency heat pump air conditioner is too coarse, one is that the expansion valve is set to be a fixed opening degree in the whole frosting process, the flow of a refrigerant passing through the fixed opening degree can meet the matching requirement of a heat exchanger at the initial stage of frosting, the refrigerant can be completely evaporated, but the heat exchange capacity of the evaporator is gradually reduced along with the increase of a frost layer in the low-temperature heating frosting process, the fixed refrigerant flow cannot be completely evaporated, the refrigerant and the heat exchange capacity are not matched with each other more and more, the capacity is quickly attenuated, and the using effect of; one is to adjust the electronic expansion valve once according to the change condition of the evaporation temperature in the low-temperature frosting process, but the adjustment amplitude is often too large, so that the instantaneous sudden change of the evaporation pressure and the evaporation temperature can be caused, the ice crystals can grow rapidly, the stability of the frosting process of the system can be damaged, the frosting period can be shortened, the frequent defrosting of the air conditioner can be caused, and uncomfortable feeling can be brought.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the low-temperature heating refrigerant flow matching control method and the air conditioner, which can dynamically match the refrigerant flow with the heat exchange capacity of the evaporator in the frosting process, improve the low-temperature heating capacity, prolong the frosting period, reduce the energy consumption and the cost, reduce the defrosting noise pollution and improve the use comfort.
The low-temperature heating refrigerant flow matching control method comprises the following steps:
s1: when the air conditioner enters a heating mode, judging whether the condition for entering defrosting control is met, if so, executing a step S2, and if not, operating according to the original stable heating mode;
s2: the air conditioner carries out defrosting operation; after defrosting is finished, the electronic expansion valve is restored to the initial opening degree, and frosting timing is started according to preset frosting time; when the frosting time reaches the preset frosting time, executing the step S3;
s3: starting valve adjustment timing according to preset expansion valve adjustment time;
s4: when the valve adjusting timing reaches the preset expansion valve adjusting time, the electronic expansion valve is closed by one step, whether the opening degree of the electronic expansion valve is reduced to the preset lower limit opening degree or not is judged, if yes, the step S6 is executed, and if not, the step S5 is executed;
s5: judging whether to enter defrosting control, if so, executing step S2, and if not, executing step S3;
s6: the electronic expansion valve keeps the opening degree unchanged;
s7: when the condition for entering the defrosting control is reached, step S2 is executed, otherwise step S6 is executed.
Further, the frosting time is 2-8 minutes.
Furthermore, the adjusting time of the expansion valve is 15-60 seconds.
Furthermore, the lower limit opening degree of the electronic expansion valve is 1/2-4/5 of the initial opening degree.
An air conditioner, which adopts any one of the above-mentioned low-temperature heating refrigerant flow matching control methods, includes an electronic expansion valve, and further includes:
a control unit: the electronic expansion valve is used for judging and adjusting the opening degree of the electronic expansion valve;
a clock module: carrying out frosting timing and valve adjusting timing;
a sensor: for detecting an environmental parameter relating to entering defrost control;
the control unit is electrically connected with the electronic expansion valve, the clock module and the sensor respectively.
Compared with the prior art, the invention has the following beneficial effects:
1. the refrigerant flow in the frosting process is dynamically matched according to the change of the heat exchange capacity of the evaporator, so that the problem of air conditioner performance deterioration caused by the fact that the refrigerant and the heat exchange capacity are not matched in the fixed-opening expansion valve in the prior art is solved, the low-temperature heating capacity of the air conditioner is remarkably improved, and the using effect is improved;
2. the refrigerant flow is controlled gradually and stably in the low-temperature heating frosting process, the problems that the frosting process is unstable and the frosting period is shortened due to rough control of the flow of the electronic expansion valve in the prior art are solved, the defrosting times are reduced while the frosting period is prolonged, the energy consumption and the cost are effectively reduced, the noise pollution of defrosting is reduced, and the comfort is improved.
Drawings
FIG. 1 is a schematic block diagram of the process of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with reference to the specific drawings.
As shown in fig. 1, the method for controlling the flow rate of a low-temperature heating refrigerant in a matching manner includes the following steps:
s1: when the air conditioner enters a heating mode, judging whether the condition for entering defrosting control is met, if so, executing a step S2, and if not, operating according to the original stable heating mode;
s2: the air conditioner carries out defrosting operation; after defrosting is finished, the electronic expansion valve is restored to the initial opening degree, and frosting timing is started according to preset frosting time; when the frosting time reaches the preset frosting time, executing the step S3;
s3: starting valve adjustment timing according to preset expansion valve adjustment time;
s4: when the valve adjusting timing reaches the preset expansion valve adjusting time, the electronic expansion valve closes the valve by one step (namely, opening is reduced by one), at the moment, whether the opening degree of the electronic expansion valve is reduced to the preset lower-limit opening degree is judged, if yes, the step S6 is executed, and if not, the step S5 is executed;
s5: judging whether to enter defrosting control, if so, executing step S2, and if not, executing step S3;
s6: the electronic expansion valve keeps the opening degree unchanged;
s7: when the condition for entering the defrosting control is reached, step S2 is executed, otherwise step S6 is executed.
When the air conditioner is heated at low temperature, because the evaporating temperature of a refrigerant of the outdoor heat exchanger is lower than 0 ℃, a frost layer can be gradually formed on the surface of the heat exchanger, and the frost layer is thicker when the time is longer, the ventilation and heat exchange of the system and the reliability of the air conditioner can be seriously influenced, so that the air conditioner can enter defrosting control when reaching a certain degree. Whether the defrosting control can be carried out or not is judged, and environmental parameters such as outdoor atmospheric temperature, evaporating temperature and the like can be detected and compared, and the defrosting control is not described herein because the defrosting control belongs to the prior art. The original stable heating is the state that the outdoor heat exchanger is not frosted, and the system is stable in the state, so that the system cannot enter an unstable heating state due to frosting. The initial opening is the opening of the electronic expansion valve which meets the heat exchange load at the initial stage of the frosting of the system. The frosting time is estimated time of the initial frosting stage, and the matching requirement of the heat exchanger can be met by adopting the refrigerant flow passing through the initial opening degree at the initial frosting stage. The expansion valve adjustment time is the time interval between each step of closing the electronic expansion valve, and after the initial frosting period, along with the increase of a frost layer, the heat exchange capacity of the evaporator is gradually reduced, the initially fixed refrigerant flow cannot be completely evaporated, so that the refrigerant and the heat exchange capacity are not matched with each other, the capacity is rapidly attenuated, and the use effect of the air conditioner is deteriorated; the adjustment time of the expansion valve is set to gradually reduce the flow of the refrigerant to match the heat exchange capacity of the evaporator, so that the performance of the air conditioner is prevented from being deteriorated. The lower limit opening degree is set by the system to avoid the influence on the performance and the reliability of the air conditioner caused by the fact that the electronic expansion valve is closed to a closed state along with the frosting time, so that the electronic expansion valve reaching the lower limit opening degree is not adjusted downwards.
The method has the advantages that the refrigerant flow at the initial frosting stage is matched with the heat exchange capacity of the evaporator by setting the frosting time and the initial opening degree, the gradually reduced refrigerant flow is dynamically matched with the heat exchange capacity of the evaporator which is gradually reduced due to the increase of a frost layer after the initial frosting stage by setting the expansion valve adjusting time and the one-step operation of closing the valve of the electronic expansion valve each time, on one hand, the problem of air conditioner performance deterioration caused by the mismatching of the refrigerant and the heat exchange capacity of the expansion valve with the fixed opening degree in the prior art is solved, the low-temperature heating capacity of the air conditioner is obviously improved, and the use effect is improved; on the other hand, the problems that the frosting process is unstable and the frosting period is shortened due to rough control of the flow of the electronic expansion valve in the prior art are solved, the frosting period is prolonged, the defrosting times are reduced, the energy consumption and the cost are effectively reduced, the noise pollution of defrosting is reduced, and the comfort is improved.
As a further optimization, the frosting time can be 2-8 minutes. In particular, the frosting time is preferably 4 minutes.
As a further optimization, the adjusting time of the expansion valve can be 15-60 seconds. In particular, the expansion valve adjustment time is preferably 30 seconds.
As a further optimization, the lower limit opening degree of the electronic expansion valve can be 1/2-4/5 of the initial opening degree. And if the initial opening is 200, the selectable range of the lower-limit opening is 100-160. Specifically, the lower limit opening degree is preferably 3/4, and is 150 in the case where the initial opening degree is 200.
The frosting time, the expansion valve adjusting time, the lower limit opening degree of the electronic expansion valve and the initial opening degree can be adaptively adjusted according to the specific frosting environment and the air conditioner performance.
An air conditioner adopts any one of the above-mentioned low-temperature heating refrigerant flow matching control methods, including an electronic expansion valve, and also includes:
a control unit: the electronic expansion valve is used for judging and adjusting the opening degree of the electronic expansion valve;
a clock module: carrying out frosting timing and valve adjusting timing;
a sensor: for detecting in real time environmental parameters relating to entering defrost control;
the control unit is electrically connected with the electronic expansion valve, the clock module and the sensor respectively.
The control unit can adopt MCU, FPGA, PLC and the like. The environmental parameters regarding the entering defrost control may include outdoor atmospheric temperature, outdoor evaporating temperature, and the like.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, and all technical solutions belonging to the principle of the present invention belong to the protection scope of the present invention. Modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (4)
1. The low-temperature heating refrigerant flow matching control method is characterized by comprising the following steps of:
s1: when the air conditioner enters a heating mode, judging whether the condition for entering defrosting control is met, if so, executing a step S2, and if not, operating according to the original stable heating mode;
s2: the air conditioner carries out defrosting operation; after defrosting is finished, the electronic expansion valve is restored to the initial opening degree, and frosting timing is started according to preset frosting time; when the frosting time reaches the preset frosting time, executing the step S3;
s3: starting valve adjustment timing according to preset expansion valve adjustment time;
s4: when the valve adjusting timing reaches the preset expansion valve adjusting time, the electronic expansion valve is closed by one step, whether the opening degree of the electronic expansion valve is reduced to the preset lower limit opening degree or not is judged, if yes, the step S6 is executed, and if not, the step S5 is executed;
s5: judging whether to enter defrosting control, if so, executing step S2, and if not, executing step S3;
s6: the electronic expansion valve keeps the opening degree unchanged;
s7: when the condition for entering the defrosting control is reached, step S2 is executed, otherwise step S6 is executed;
the adjusting time of the expansion valve is 15-60 seconds;
the initial opening is the opening of the electronic expansion valve which meets the heat exchange load at the initial stage of the frosting of the system.
2. The method of claim 1, wherein the method comprises:
the frosting time is 2-8 minutes.
3. The method of claim 1, wherein the method comprises:
the lower limit opening degree of the electronic expansion valve is 1/2-4/5 of the initial opening degree.
4. An air conditioner, characterized in that: the method for controlling the flow rate of a low-temperature heating refrigerant according to any one of claims 1 to 3, comprising an electronic expansion valve, and further comprising:
a control unit: the electronic expansion valve is used for judging and adjusting the opening degree of the electronic expansion valve;
a clock module: carrying out frosting timing and valve adjusting timing;
a sensor: for detecting an environmental parameter relating to entering defrost control;
the control unit is electrically connected with the electronic expansion valve, the clock module and the sensor respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810404406.4A CN108826582B (en) | 2018-04-28 | 2018-04-28 | Low-temperature heating refrigerant flow matching control method and air conditioner |
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| CN201810404406.4A CN108826582B (en) | 2018-04-28 | 2018-04-28 | Low-temperature heating refrigerant flow matching control method and air conditioner |
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| CN108826582B true CN108826582B (en) | 2020-11-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109827361A (en) * | 2018-12-29 | 2019-05-31 | 西安交通大学 | The reverse cycle defrosting method, apparatus of air-conditioning system and air-conditioning system |
| DE102022122901A1 (en) | 2022-09-09 | 2024-03-14 | Vaillant Gmbh | Method for operating a refrigeration circuit, computer program, control and control device and air conditioning device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993024795A1 (en) * | 1992-05-29 | 1993-12-09 | Daikin Industries, Ltd. | System for controlling operation of refrigerating device |
| CN101726072A (en) * | 2008-10-24 | 2010-06-09 | 海尔集团公司 | Control mode of low-temperature heating of variable frequency air conditioner |
| CN103388944A (en) * | 2013-08-02 | 2013-11-13 | 广东美的制冷设备有限公司 | Air-conditioning system and control method thereof |
| CN106016628A (en) * | 2016-06-30 | 2016-10-12 | 珠海格力电器股份有限公司 | Defrosting control method and device for air conditioner |
| CN107606830A (en) * | 2017-09-05 | 2018-01-19 | 浙江正理生能科技有限公司 | A kind of electric expansion valve adjusting method |
-
2018
- 2018-04-28 CN CN201810404406.4A patent/CN108826582B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993024795A1 (en) * | 1992-05-29 | 1993-12-09 | Daikin Industries, Ltd. | System for controlling operation of refrigerating device |
| CN101726072A (en) * | 2008-10-24 | 2010-06-09 | 海尔集团公司 | Control mode of low-temperature heating of variable frequency air conditioner |
| CN103388944A (en) * | 2013-08-02 | 2013-11-13 | 广东美的制冷设备有限公司 | Air-conditioning system and control method thereof |
| CN106016628A (en) * | 2016-06-30 | 2016-10-12 | 珠海格力电器股份有限公司 | Defrosting control method and device for air conditioner |
| CN107606830A (en) * | 2017-09-05 | 2018-01-19 | 浙江正理生能科技有限公司 | A kind of electric expansion valve adjusting method |
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