CN110542175A - air conditioner defrosting method - Google Patents
air conditioner defrosting method Download PDFInfo
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- CN110542175A CN110542175A CN201910842159.0A CN201910842159A CN110542175A CN 110542175 A CN110542175 A CN 110542175A CN 201910842159 A CN201910842159 A CN 201910842159A CN 110542175 A CN110542175 A CN 110542175A
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- 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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner defrosting method, relates to the field of air conditioners, and aims to optimize the air conditioner defrosting method. The air conditioner defrosting method comprises the following steps: a refrigerant circulating system of the air conditioner is in a heating cycle; judging whether each second heat exchanger meets the defrosting starting condition, wherein the defrosting starting condition comprises the following steps: the exhaust temperature TP of the compressor is greater than the set defrosting starting exhaust temperature TPS; if the second heat exchangers meet defrosting conditions, switching the second heat exchangers to a defrosting mode according to a set sequence; the defrosting mode is to disconnect the heating circulation branch where the second heat exchanger to be defrosted is located, and to enable the outlet of the compressor to be communicated with the bypass branch of the second heat exchanger to be defrosted. According to the technical scheme, the bypass branch is adopted for defrosting, and the defrosting entering condition of the second heat exchanger is set, so that defrosting is carried out under the timely condition, the temperature of a refrigerant for defrosting is guaranteed, the defrosting effect is improved, and the defrosting time is shortened.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner defrosting method.
Background
For a low-temperature heating air-cooling screw type unit, fins of an outdoor heat exchanger are evaporators during heating, and the fins can frost due to low air temperature. If defrosting is not performed in time, the frost layer adheres to the surface of the fin, and heat exchange is affected. The conventional defrosting mode is to adopt a four-way reversing valve, and to realize defrosting of the outdoor heat exchanger by switching the four-way valve and by refrigerant reverse circulation.
The inventor finds that at least the following problems exist in the prior art: the existing defrosting mode needs to switch a four-way valve, and the four-way valve can generate mechanical strain after long-term action; in addition, the refrigerant is reversely circulated to defrost, so that the comfortable experience of a user is influenced.
Disclosure of Invention
The invention provides an air conditioner defrosting method which is used for optimizing the air conditioner defrosting method.
The embodiment of the invention provides an air conditioner defrosting method, which comprises the following steps:
The refrigerant circulating system of the air conditioner is in a heating cycle; the refrigerant circulating system comprises a compressor, a first heat exchanger and at least two second heat exchangers;
Judging whether each second heat exchanger meets a defrosting starting condition, wherein the defrosting starting condition comprises the following steps: the exhaust temperature TP of the compressor is greater than the set defrosting starting exhaust temperature TPS;
if the second heat exchangers meet defrosting conditions, switching the second heat exchangers to a defrosting mode according to a set sequence; the defrosting mode is to disconnect the heating circulation branch where the second heat exchanger to be defrosted is located, and to enable the outlet of the compressor to be communicated with the bypass branch of the second heat exchanger to be defrosted.
In some embodiments, the defrost initiation vent set temperature TPS is between 1 ℃ and 100 ℃.
In some embodiments, the defrost initiating condition further comprises:
And judging whether the detected ambient temperature TH of the refrigerant in the second heat exchanger is less than or equal to the set refrigerant temperature TS for starting defrosting.
In some embodiments, the defrosting start setting refrigerant temperature TS is-15 ℃ to 10 ℃.
in some embodiments, the defrost initiating condition further comprises:
and judging whether the detected running time TY of the compressor is greater than the set running time TYS of the compressor.
In some embodiments, the compressor is operated for a set time period TYS of 1 minute to 10 minutes.
in some embodiments, the defrost initiating condition further comprises:
And judging whether the detected outlet water temperature TR of the air conditioner is greater than the set outlet water temperature TCS for starting defrosting.
In some embodiments, the defrosting start setting water outlet temperature TCS is 0-100 ℃.
In some embodiments, the defrost initiating condition further comprises:
And judging whether the operation time TFY of the fan corresponding to each second heat exchanger is greater than the set operation time TF of the fan.
In some embodiments, the fan operation set time period TF is between 1 minute and 30 minutes.
In some embodiments, the defrost initiating condition further comprises:
and judging whether THE time for starting defrosting is more than THE set defrosting ending time THE or not.
in some embodiments, THE set defrosting end time period, THE, is between 1 minute and 10 minutes.
In some embodiments, the air conditioner defrosting method further comprises the following steps:
Judging whether the second heat exchanger which is defrosting meets the condition of stopping defrosting or not;
And if the condition of stopping defrosting is met, the second heat exchanger is exited from the defrosting mode.
in some embodiments, the defrosting-stopping condition comprises one of: the compressor exhaust temperature TP is less than or equal to the defrosting-ending exhaust set temperature TPE; and whether the ambient temperature TH of the refrigerant in the second heat exchanger undergoing defrosting is greater than the set refrigerant temperature TE for finishing defrosting.
in some embodiments, the defrost vent end setting temperature TPE is 0-50 ℃.
In some embodiments, the defrosting-ending set refrigerant temperature TE is 0 ℃ to 50 ℃.
In some embodiments, the air conditioner includes a heat pump unit, and the defrosting stop condition includes one of: judging whether the detected outlet water temperature TR of the air conditioner is greater than a defrosting finishing set outlet water temperature TCE or not, wherein the air conditioner comprises a heat pump unit; and whether the defrosting time of the second heat exchanger is greater than the set defrosting time TDE or not.
In some embodiments, the defrosting ending set water outlet temperature TCE is 5-15 ℃.
In some embodiments, the set defrosting time period TDE is 1 minute to 15 minutes.
in some embodiments, if there are second heat exchangers satisfying the defrosting condition, switching each of the second heat exchangers to the defrosting mode in a set order includes:
If two or more second heat exchangers meet defrosting conditions, determining a defrosting sequence of each second heat exchanger according to the operation time of a fan corresponding to each second heat exchanger;
and sequentially switching the second heat exchangers to a defrosting mode according to a defrosting sequence.
In some embodiments, if two or more second heat exchangers meet a defrosting condition, determining a defrosting sequence of each second heat exchanger according to an operating time of a fan corresponding to each second heat exchanger includes:
If the operation time lengths of the fans corresponding to the second heat exchangers are not equal, determining the defrosting sequence of each second heat exchanger according to the operation time length of the fan corresponding to the second heat exchanger;
And if the running time lengths of the fans corresponding to two or more than two second heat exchangers are equal, randomly determining the defrosting sequence of the second heat exchangers with the same running time length of each fan.
According to the technical scheme, the bypass branch is adopted for defrosting, defrosting entering conditions of the second heat exchangers needing defrosting are set, when defrosting is needed, part of high-temperature and high-pressure refrigerant is directly led out from the outlet of the compressor and conveyed to the second heat exchangers needing defrosting, defrosting treatment is conducted on the second heat exchangers, defrosting can be conducted under the timely conditions, the temperature of the refrigerant needing defrosting is guaranteed, the defrosting effect of the second heat exchangers is improved, and defrosting duration is shortened. And, through setting for suitable defrosting entering condition for the air conditioner can not change refrigerant circulation circuit because of will changing the white operation, also need not switch the cross valve, also can not influence the normal operating and the work of other second heat exchangers that do not need to change the frost, has improved the intelligent degree of equipment greatly, has also improved comfort and the reliability that the air conditioner used.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
Fig. 1 is a schematic diagram of a refrigerant circulation system of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an air conditioner defrosting method according to an embodiment of the present invention;
FIG. 3 is a schematic view illustrating a control flow of starting defrosting in an improved air conditioner defrosting method according to an embodiment of the present invention;
Fig. 4 is a schematic view illustrating a defrosting ending control flow of an air conditioner defrosting method according to an embodiment of the present invention.
Detailed Description
The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 4.
Before the air conditioner defrosting method provided by the embodiment of the invention is introduced, a refrigerant circulating system is introduced, and the air conditioner defrosting method provided by the embodiment of the invention is explained in detail based on the system. It should be noted that these are only examples and are not limiting.
referring to fig. 1, an embodiment of the present invention provides a refrigerant circulation system, which includes a compressor 1, a first heat exchanger 2, two second heat exchangers 3, an oil separator 4, a gas-liquid separator 5, a plurality of valves, a drying filter 6, and a throttling element 7.
The heating cycle process of the refrigerant cycle system is as follows: compressor 1 → oil separator 4 → first 2 heat exchanger → dry filter 6 → throttling element 7 → air-cooled fin heat exchanger → vapor-liquid separator 5 → compressor 1.
the refrigerant cycle operation in the defrosting process is as follows: compressor 1 discharge port → electromagnetic valve 9 (electromagnetic valve 9a and electromagnetic valve 9b are alternatively opened) → second heat exchanger 3 (first second heat exchanger 3a and second heat exchanger 3b are alternatively opened) → vapor-liquid separator 5 → compressor 1 suction port.
Referring to fig. 1, the outlet of the compressor 1 is connected to the inlet of an oil separator 4, and the outlet of the oil separator 4 communicates with the inlet of the first heat exchanger 2. The outlet of the first heat exchanger 2 is communicated with the inlets of the two second heat exchangers 3 respectively. The outlets of the two second heat exchangers 3 communicate with the inlet of the gas-liquid separator 5. The outlet of the gas-liquid separator 5 communicates with the inlet of the compressor 1. The connection relation forms a refrigerant heating circulation loop. Normally, both second heat exchangers 3 are in the heating cycle. When the second heat exchanger 3 needs defrosting, defrosting is performed one by one. Namely, one second heat exchanger 3 is switched to the defrosting mode, and after defrosting is completed, defrosting of the next second heat exchanger 3 is performed.
With continued reference to fig. 1, the oil return of the oil separator 4 communicates with the inlet of the compressor 1. Which is to convey the lubricating oil in the oil separator 4 to the compressor 1.
In order to realize the defrosting of the bypass branch, one realization mode is as follows: a bypass branch is directly arranged at the outlet of the second heat exchanger 3 and the compressor 1. As shown in fig. 1, a first bypass branch L1 is provided between the first second heat exchanger 3a and the outlet of the compressor 1; the first bypass branch L1 is provided with a first solenoid valve 9a, and the conduction and the cut-off of the first bypass branch L1 are controlled by the first solenoid valve 9 a. A second bypass branch L2 is provided between the second heat exchanger 3b and the outlet of the compressor 1; the second bypass branch L2 is provided with a second solenoid valve 9b, and the conduction and the cut-off of the second bypass branch L2 are controlled by the second solenoid valve 9 b.
Referring to fig. 1, a first throttle valve 7a is disposed between the first heat exchanger 2 and the first second heat exchanger 3a, and the flow rate of the refrigerant entering the first second heat exchanger 3a is controlled by the first throttle valve 7 a. A second throttle valve 7b is arranged between the first heat exchanger 2 and the second heat exchanger 3b, and the flow of the refrigerant entering the second heat exchanger 3b is controlled by the second throttle valve 7 b.
Referring to fig. 1, a shut-off valve 10, a filter 11, a sight glass 12, an oil return solenoid valve 13, a capillary tube 14 are provided on a branch between an oil outlet of the oil separator 4 and an inlet of the compressor 1 to control the amount of oil and the pressure of oil returned from the oil separator 4 to the compressor 1.
Two second heat exchangers 3 all adopt air-cooled fin heat exchangers, and every second heat exchanger 3 all corresponds and is provided with a fan 8. Specifically, the first second heat exchanger 3a is provided with a first fan 8a, and the second heat exchanger 3b is provided with a second fan 8 b.
Referring to fig. 1, in some embodiments, the second heat exchanger 3 in the heating cycle may be directly switched to the defrost mode by providing a corresponding control assembly. Specifically, a first throttling element 7a is arranged on a branch between the outlet of the first heat exchanger 2 and the first second heat exchanger 3 a; a second throttling element 7b is arranged on a branch between the outlet of the first heat exchanger 2 and the second heat exchanger 3 b.
Which second heat exchanger 3 needs defrosting, the throttling element on the branch between the second heat exchanger 3 and the outlet of the first heat exchanger 2 is closed to cut off the branch in which the second heat exchanger 3 is located.
If the first second heat exchanger 3 needs defrosting, the first throttling element 7a on the branch between the first second heat exchanger 3a and the outlet of the first heat exchanger 2 is disconnected, and the opening degree of the second throttling element 7b is kept unchanged. In this case, the branch in which the first throttling element 7a is located is disconnected, and the branch in which the second throttling element 7b is located is kept connected. The first solenoid valve 9a is then opened, so that the first bypass branch L1 in which the first solenoid valve 9a is located is conductive. The second solenoid valve 9b is kept in the off state, so that the second bypass branch L2 where the second solenoid valve 9b is located is turned off.
If the second heat exchanger 3b needs defrosting, the second throttling element 7b on the branch between the second heat exchanger 3b and the outlet of the first heat exchanger 2 is disconnected, and the opening degree of the first throttling element 7a is kept unchanged. In this case, the branch in which the second throttling element 7b is located is disconnected, and the branch in which the first throttling element 7a is located is kept connected. Then, the second solenoid valve 9b is opened, so that the second bypass branch of the second solenoid valve 9b is conducted. The first solenoid valve 9a is kept in the open state, so that the first bypass branch in which the first solenoid valve 9a is located is open.
in order to reduce or even avoid the liquid-carrying problem of the compressor 1, the refrigerant quantity contained in the gas-liquid separator 5 is 70% of the refrigerant perfusion quantity of the gas-liquid separator 5.
it should be noted that if there are more than two second heat exchangers 3, a throttling element 7 and a solenoid valve 9 may be provided for each second heat exchanger 3. In order not to affect the heating capacity of the refrigerant cycle system, optionally, only one second heat exchanger 3 is defrosted at a time. With the arrangement, the amount of the defrosting refrigerant led out from the compressor 1 is small, and the influence on the normal heating operation of a user due to defrosting is avoided as much as possible.
as mentioned above, in some embodiments herein, two second heat exchangers 3, i.e. a second heat exchanger 3a and a second heat exchanger 3b, are exemplified.
assuming that the second heat exchanger 3a is defrosting at this time, the second heat exchanger 3b is in a heating cycle state (the second heat exchanger 3b is used as an evaporator at this time):
The refrigerant flow path of the branch where the second heat exchanger 3a is located is as follows: a small part of high-temperature gas bypasses from the discharge port of the compressor 1 and enters the second heat exchanger 3a, heat is released to melt frost layers, and the frost layers form medium-temperature high-pressure refrigerant liquid which flows out and enters the gas-liquid separator 5.
The refrigerant flow path of the branch where the second heat exchanger 3b is located is as follows: most of high-temperature high-pressure gas from the exhaust outlet of the compressor 1 enters the first heat exchanger 2, heat is released to heat water, formed medium-temperature high-pressure refrigerant liquid is throttled by the throttling element 7 and then enters the second heat exchanger 3b to be evaporated and exchanged heat, formed low-pressure superheated refrigerant gas enters the compressor 1 through the gas-liquid separator 5.
In this case, the refrigerant of the vapor-liquid separator 5 comes from two sources, i.e., the medium-temperature and high-pressure refrigerant liquid from the second heat exchanger 3a, and the amount of the refrigerant is small. Due to the start buffering action of the vapor-liquid separator 5, all of the refrigerant does not immediately enter the compressor 1. The second is the refrigerant gas from the second heat exchanger 3b which is overheated at low temperature, the cold quantity of the part of the refrigerant is large, and the gas-liquid separator 5 can further absorb the heat of the refrigerant liquid from the second heat exchanger 3a to evaporate the heat to form gas.
When the unit is detected to be defrosted, the first electromagnetic valve 9a and the second electromagnetic valve 9b are selected to be opened, high-temperature and high-pressure refrigerant gas enters the corresponding fin heat exchanger from the exhaust port of the compressor 1, and a frost layer in the fin absorbs heat of the high-temperature and medium-pressure refrigerant and is decomposed into water.
different fins may have different frost layer thicknesses, so that defrosting progresses differently, so that each second heat exchanger 3 is controlled independently, and the air conditioner also keeps heating while part of the second heat exchangers 3 are defrosted, namely, defrosting of one or part of the second heat exchangers 3 does not influence the normal working state of other second heat exchangers 3.
The air conditioner defrosting method is described in detail below.
the embodiment of the invention provides an air conditioner defrosting method, which comprises the following steps:
step S100, the refrigerant circulation system of the air conditioner is in a heating cycle. The refrigerant circulating system comprises a compressor 1, a first heat exchanger 2 and at least two second heat exchangers 3.
The detailed description of the heating cycle system is given above and will not be repeated here.
And step S200, judging whether each second heat exchanger 3 meets the defrosting starting condition. The starting defrosting conditions include: the discharge temperature TP of the compressor 1 is greater than the defrosting start discharge set temperature TPs. If the exhaust temperature TP of the compressor 1 is greater than the defrosting starting exhaust set temperature TPS, the second heat exchanger 3 can be defrosted; if the discharge temperature TP of the compressor 1 is less than or equal to the defrosting start discharge set temperature TPs, the second heat exchanger 3 is not prepared for defrosting.
the hot gas bypass defrosting refers to that the high-temperature and high-pressure refrigerant discharged by the compressor 1 is introduced into the second heat exchanger 3 to be defrosted, and the frost layer attached to the outer surface of the second heat exchanger 3 to be defrosted is removed by utilizing the heat released by condensation of the high-temperature and high-pressure refrigerant. Therefore, the exhaust temperature TP of the compressor 1 directly affects the defrosting effect, and the higher the exhaust temperature TP of the compressor 1 is, the better the defrosting effect is. The lower the discharge temperature TP of the compressor 1, the weaker the defrosting effect.
in the above step S200, in order to reduce the fluctuation of the discharge temperature TP of the compressor 1, thereby affecting the accuracy of the detection, the discharge temperature TP of the compressor 1 may be collected within a certain time period, for example, the discharge temperature TP of the compressor 1 is collected continuously within 30 seconds, and if all the collected temperature samples are greater than the defrosting-starting discharge set temperature TPs, the discharge temperature TP of the compressor 1 is considered to be greater than the defrosting-starting discharge set temperature TPs.
In the step S200, the exhaust temperature TP of the compressor 1 is used as a condition for triggering defrosting, so that the defrosting effect is effectively improved, and the defrosting time is shortened.
in some embodiments, the defrost initiation vent set temperature TPS is between 1 deg.C and 100 deg.C.
Specific examples thereof are 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ and 100 ℃.
It is understood that the defrosting effect is better if the respective conditions for starting the defrosting described herein can be simultaneously satisfied. If only some of the frost conditions can be met, the defrosting process can also be entered. Compared with a mode of directly carrying out bypass branch defrosting without setting defrosting entrance conditions, the defrosting method has the advantages of better defrosting effect and shorter defrosting time.
in some embodiments, initiating a defrost condition further comprises: and judging whether the detected ambient temperature TH of the refrigerant in the second heat exchanger 3 is less than or equal to the set refrigerant temperature TS for starting defrosting.
Specifically, the temperature sensing bulb is used for detecting the refrigerant in the second heat exchanger 3, and when the temperature of the refrigerant is lower than a set value, the temperature of the second heat exchanger 3 is relatively low, in this case, the probability of frost layer occurrence of the second heat exchanger 3 is relatively high. Therefore, in some embodiments, the ambient temperature TH of the refrigerant in the second heat exchanger 3 is also used as a condition for determining whether defrosting is performed.
It should be noted that, herein, all the defrosting starting conditions are preferably satisfied at the same time; if all the defrosting conditions cannot be met at the same time, part of the defrosting conditions can also be met. For example, for the first second heat exchanger 3 to be defrosted, there is no last defrosting interval time, so that for the first second heat exchanger 3 to be defrosted in the current operation of the system, it is not necessary to judge the interval time from the last defrosting.
in some embodiments, the refrigerant temperature TS is set to-15 deg.C to 10 deg.C, specifically-15 deg.C, -10 deg.C, -5 deg.C, -4 deg.C, 0 deg.C, 3 deg.C, 5 deg.C, 7 deg.C, and 10 deg.C.
In some embodiments, initiating a defrost condition further comprises: and judging whether the detected running time TY of the compressor 1 is greater than the set running time TYS of the compressor 1.
the air conditioner is, for example, an air source heating unit, which requires hot water to be supplied to the user side. When the detected running time TY of the compressor 1 is greater than the set running time TYS of the compressor 1, defrosting operation is carried out, so that hot water is generated in the running time TY of the unit, and even if defrosting operation is carried out subsequently, hot water is output from a user side.
In some embodiments, the compressor 1 is operated for a set time period TYS of 1 minute to 10 minutes, specifically, 1 minute, 2 minutes, 3 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, 10 minutes.
In some embodiments, initiating a defrost condition further comprises:
And judging whether the detected outlet water temperature TR of the air conditioner is greater than the set outlet water temperature TCS for starting defrosting.
in view of the above, if the air conditioner is an air source heating unit, the air source heating unit needs to deliver hot water to the user side. Whether defrosting treatment is carried out or not is judged according to the outlet water temperature TR of the air conditioner, so that the temperature of hot water obtained by a user side can meet requirements, and the normal use requirement of the user side on the hot water is not influenced by defrosting.
In some embodiments, the start of defrosting is set to a temperature TCS of 0 ℃ to 100 ℃, specifically 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ and 100 ℃.
In some embodiments, initiating a defrost condition further comprises: and judging whether the operation time TFY of the fan corresponding to each second heat exchanger 3 is longer than the set operation time TF of the fan.
The second heat exchanger 3 adopts an air-cooled fin heat exchanger. One fan 8 is associated with each second heat exchanger 3. If the running time of the fan 8 is long, the working time of the second heat exchanger 3 is long, and the frosting phenomenon is easy to occur.
In addition, when other defrosting starting conditions are met, the defrosting sequence of each second heat exchanger 3 can be determined according to the operating time of the fan corresponding to each second heat exchanger 3. The second heat exchanger 3 with long running time of the fan defrosts firstly. And defrosting is carried out after the second heat exchanger 3 with short running time of the fan.
In some embodiments, the fan operation setting time period TF is 1 minute to 30 minutes, such as 1 minute, 5 minutes, 8 minutes, 10 minutes, 15 minutes, 18 minutes, 25 minutes, 28 minutes, 30 minutes.
In some embodiments, initiating a defrost condition further comprises: and judging whether THE time for starting defrosting is more than THE set defrosting ending time THE or not.
in the defrosting operation, from the second start of defrosting, the interval time between the current defrosting and the last defrosting can be judged. The interval time TM meets the requirement, so that the condition that the defrosting effect is influenced due to the fact that the exhaust temperature of the compressor 1 is too low when defrosting is carried out next time because defrosting is too frequent can be reduced and even avoided; and the influence of too frequent defrosting on the heating performance of the whole air-conditioning circulating system is reduced, and the influence on the normal heating and water heating of the air conditioner due to defrosting operation is avoided.
In some embodiments, THE defrosting end time period he is set to be 1 minute to 10 minutes, specifically, 1 minute, 2 minutes, 3 minutes, 5 minutes, 7 minutes, 10 minutes.
And step S300, if the second heat exchangers 3 meet the defrosting condition, switching the second heat exchangers 3 meeting the defrosting condition to a defrosting mode according to a set sequence. The defrosting mode is to disconnect the heating circulation branch where the second heat exchanger 3 to be defrosted is located, and to conduct the branch where the outlet of the compressor 1 is directly communicated with the second heat exchanger 3 to be defrosted.
Setting the order such as a random order; or the refrigerant environment temperatures TH in the second heat exchangers 3 are arranged from low to high, the second heat exchanger 3 with the low refrigerant environment temperature TH defrosts firstly, and the second heat exchanger 3 with the high refrigerant environment temperature TH defrosts secondly. Or, the defrosting sequence is determined according to the product brands of the second heat exchangers 3.
The above conditions and steps mainly describe how to start the air conditioner for defrosting operation. After defrosting for a period of time, defrosting needs to be stopped. The embodiment of the invention also sets some conditions for finishing defrosting. The condition for ending defrosting hereinafter, which satisfies any one of the conditions, may indicate that there is no frost layer on the second heat exchanger 3, and the defrosting operation may be exited.
In some embodiments, the air conditioner defrosting method further comprises the following steps:
And step S400, judging whether the second heat exchanger 3 which is defrosted meets the condition of stopping defrosting.
And step S500, if the condition of stopping defrosting is met, the second heat exchanger 3 is quitted from the defrosting mode.
the conditions for stopping defrosting in step S400 are described in detail below.
in some embodiments, the conditions to stop defrosting comprise one of: the exhaust temperature TP of the compressor 1 is less than or equal to the defrosting-finished exhaust set temperature TPE; whether the ambient temperature TH of the refrigerant in the second heat exchanger 3 being defrosted is greater than the defrosting-finished set refrigerant temperature TE.
The exhaust temperature is reduced to the set refrigerant temperature TE for finishing defrosting, the characteristic of the air-breathing liquid-carrying screw compressor 1 can be represented, the air-breathing liquid-carrying screw compressor can bear a small amount of liquid in a short time, and the target value is controlled to be higher than the dangerous exhaust temperature, so that the liquid-carrying phenomenon of the compressor 1 can be reduced or even avoided.
In some embodiments, the defrosting-ending off-gas setting temperature TPE is 0 ℃ to 50 ℃, specifically, 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃.
In some embodiments, the coolant temperature TE for ending defrosting is set to 0 ℃ to 50 ℃, specifically, 0 ℃, 8 ℃, 18 ℃, 28 ℃, 38 ℃ and 50 ℃.
For the air conditioner with the function of heating water, the water outlet temperature can also be adopted to judge whether defrosting is finished. In some embodiments, the conditions for stopping defrosting include: and judging whether the detected outlet water temperature TR of the air conditioner is greater than the set outlet water temperature TCE for finishing defrosting. The defrosting is quitted when the temperature of hot water is reduced to influence the comfort level of a user in the process of controlling bypass defrosting, and the comfort level of the user is ensured.
In some embodiments, the water temperature TCE is set to 5-15 deg.C, specifically 5 deg.C, 8 deg.C, 10 deg.C, 15 deg.C.
In other embodiments, the conditions to stop defrosting include: whether the defrosting time period of the second heat exchanger 3 is greater than the set defrosting time period TDE.
In some embodiments, the defrosting time period TDE is set to 1 minute to 15 minutes, specifically, 1 minute, 2 minutes, 5 minutes, 8 minutes, 10 minutes, 15 minutes.
As the defrosting proceeds, the discharge temperature and suction superheat of the compressor 1 are decreased, and the possibility of liquid return of the compressor 1 may occur, which directly threatens the reliability of the compressor 1. When the defrosting time meets the requirement, the defrosting effect is basically ensured. By setting the defrosting time TDE, the occurrence of the condition can be well reduced, the possibility of liquid return of the compressor 1 is reduced, and the operation reliability of the compressor 1 is improved.
in some embodiments, if there are second heat exchangers 3 satisfying the defrosting condition, switching each of the second heat exchangers 3 to the defrosting mode in the set order includes: if two or more second heat exchangers 3 meet the defrosting condition, determining the defrosting sequence of each second heat exchanger 3 according to the operation time of the fan corresponding to each second heat exchanger 3; and sequentially switching the second heat exchangers 3 to a defrosting mode according to a defrosting sequence.
And if two or more than two second heat exchangers 3 meeting the defrosting requirement have equal fan running time, randomly determining the defrosting sequence of the second heat exchangers 3 with equal fan running time. The random manner is, for example, randomly selected according to the number of each second heat exchanger 3 or sorted according to the model of the second heat exchanger 3.
In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (21)
1. The air conditioner defrosting method is characterized by comprising the following steps:
The refrigerant circulating system of the air conditioner is in a heating cycle; the refrigerant circulating system comprises a compressor, a first heat exchanger and at least two second heat exchangers;
Judging whether each second heat exchanger meets a defrosting starting condition, wherein the defrosting starting condition comprises the following steps: the exhaust temperature TP of the compressor is greater than the set defrosting starting exhaust temperature TPS;
If the second heat exchangers meet the defrosting condition, switching the second heat exchangers meeting the defrosting condition to a defrosting mode according to a set sequence; the defrosting mode is to disconnect the heating circulation branch where the second heat exchanger to be defrosted is located, and to enable the outlet of the compressor to be communicated with the bypass branch of the second heat exchanger to be defrosted.
2. The air conditioner defrosting method according to claim 1, wherein the defrosting start exhaust gas set temperature TPS is 1 ℃ to 100 ℃.
3. The air conditioner defrosting method according to claim 1, wherein the defrosting start condition further comprises:
And judging whether the detected ambient temperature TH of the refrigerant in the second heat exchanger is less than or equal to the set refrigerant temperature TS for starting defrosting.
4. The air conditioner defrosting method according to claim 3, wherein the defrosting start setting refrigerant temperature TS is-15 ℃ to 10 ℃.
5. The air conditioner defrosting method according to claim 1, wherein the defrosting start condition further comprises:
And judging whether the detected running time TY of the compressor is greater than the set running time TYS of the compressor.
6. The air conditioner defrosting method according to claim 5, wherein the set time TYS for the operation of the compressor is 1-10 minutes.
7. The air conditioner defrosting method according to claim 1, wherein the defrosting start condition further comprises:
And judging whether the detected outlet water temperature TR of the air conditioner is greater than the set outlet water temperature TCS for starting defrosting.
8. The air conditioner defrosting method according to claim 7, wherein the defrosting start set outlet water temperature TCS is 0-100 ℃.
9. the air conditioner defrosting method according to claim 1, wherein the defrosting start condition further comprises:
And judging whether the operation time TFY of the fan corresponding to each second heat exchanger is greater than the set operation time TF of the fan.
10. The air conditioner defrosting method according to claim 9, wherein the set fan operation time period TF is 1 to 30 minutes.
11. The air conditioner defrosting method according to claim 1, wherein the defrosting start condition further comprises:
And judging whether THE time for starting defrosting is more than THE set defrosting ending time THE or not.
12. THE air conditioner defrosting method according to claim 11, wherein THE set defrosting end time period he is 1 to 10 minutes.
13. the air conditioner defrosting method according to claim 1, further comprising the steps of:
Judging whether the second heat exchanger which is defrosting meets the condition of stopping defrosting or not;
And if the condition of stopping defrosting is met, the second heat exchanger is exited from the defrosting mode.
14. The air conditioner defrosting method according to claim 13, wherein the defrosting stop condition comprises one of: the compressor exhaust temperature TP is less than or equal to the defrosting-ending exhaust set temperature TPE; and whether the ambient temperature TH of the refrigerant in the second heat exchanger undergoing defrosting is greater than the set refrigerant temperature TE for finishing defrosting.
15. The air conditioner defrosting method according to claim 14, wherein the defrosting-ending exhaust gas set temperature TPE is 0-50 ℃.
16. An air conditioner defrosting method according to claim 14, wherein the defrosting-ending set refrigerant temperature TE is 0 ℃ to 50 ℃.
17. the air conditioner defrosting method according to claim 13, wherein the defrosting stop condition comprises one of: judging whether the detected outlet water temperature TR of the air conditioner is greater than a defrosting finishing set outlet water temperature TCE or not, wherein the air conditioner comprises a heat pump unit; and whether the defrosting time of the second heat exchanger is greater than the set defrosting time TDE or not.
18. The air conditioner defrosting method according to claim 17, wherein the defrosting-finished set outlet water temperature TCE is 5 ℃ to 15 ℃.
19. The air conditioner defrosting method according to claim 17, wherein the set defrosting time period TDE is 1 to 15 minutes.
20. The air conditioner defrosting method according to claim 1, wherein if the second heat exchangers meet defrosting conditions, the switching of the second heat exchangers to the defrosting mode in a set sequence comprises:
if two or more second heat exchangers meet defrosting conditions, determining a defrosting sequence of each second heat exchanger according to the operation time of a fan corresponding to each second heat exchanger;
And sequentially switching the second heat exchangers to a defrosting mode according to a defrosting sequence.
21. The air conditioner defrosting method according to claim 20, wherein if two or more second heat exchangers meet the defrosting condition, determining the defrosting sequence of each second heat exchanger according to the operation time of the fan corresponding to each second heat exchanger comprises:
If the operation time lengths of the fans corresponding to the second heat exchangers are not equal, determining the defrosting sequence of each second heat exchanger according to the operation time length of the fan corresponding to the second heat exchanger;
and if the running time lengths of the fans corresponding to two or more than two second heat exchangers are equal, randomly determining the defrosting sequence of the second heat exchangers with the same running time length of each fan.
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