CN109737557B - Anti-frosting control method and system for outdoor unit of air conditioner - Google Patents
Anti-frosting control method and system for outdoor unit of air conditioner Download PDFInfo
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- CN109737557B CN109737557B CN201811573351.6A CN201811573351A CN109737557B CN 109737557 B CN109737557 B CN 109737557B CN 201811573351 A CN201811573351 A CN 201811573351A CN 109737557 B CN109737557 B CN 109737557B
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Abstract
The invention discloses an anti-frosting control method and system for an air conditioner outdoor unit, wherein when the temperature of an indoor coil pipe is more than or equal to a first set temperature value, an external fan is controlled to stop; when the shutdown time of the outer fan reaches a first set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, controlling the outer fan to start; otherwise, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, the outer fan is controlled to start; otherwise, controlling the outer fan to operate at a second set high wind speed, and controlling the outer fan to start when the outer fan operates at the second set high wind speed for a third set time; therefore, the frosting of the outdoor heat exchanger caused by the shutdown of the outer fan is effectively avoided, and the phenomenon that the heating capacity is reduced and even the compressor is hit by liquid is avoided.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an anti-frosting control method and system for an air conditioner outdoor unit.
Background
When the air conditioner heats and runs under a high load, the temperature of the inner coil pipe can rise, when the temperature is higher than a certain set value, the outer fan can be unloaded and shut down, the pressure of the whole system can be reduced, the temperature of the inner coil pipe can be reduced, and when the temperature is reduced to a certain temperature value, the outdoor fan can be started to run. However, when the outer fan is unloaded, the temperature of the inner coil pipe is always reduced to a set value, and the outer fan cannot be recovered, so that the outdoor heat exchanger is frosted, the heating capacity is reduced, and even the compressor is hit by liquid.
Disclosure of Invention
The invention provides an anti-frosting control method for an air conditioner outdoor unit, which can avoid frosting of an outdoor heat exchanger.
In order to solve the technical problems, the invention adopts the following technical scheme:
an anti-frosting control method for an outdoor unit of an air conditioner comprises the following steps:
(1) air-conditioning heating operation;
(2) acquiring the temperature of an indoor coil, and controlling an outer fan to stop when the temperature of the indoor coil is larger than or equal to a first set temperature value; when the shutdown time of the external fan reaches a first set time, judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value; wherein the second set temperature value is less than the first set temperature value;
if yes, controlling the external fan to start, resetting the shutdown time, and returning to the step (1);
if not, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value;
if yes, controlling the external fan to start, resetting the shutdown time, and returning to the step (1);
if not, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time; and (5) controlling the outer fan to start when the outer fan runs at the second set high wind speed for a third set time, and returning to the step (1).
Further, the control method further includes: when the outer fan runs at a second set high wind speed, monitoring the temperature of the outdoor coil pipe in real time; and (3) when the outer fan runs at a second set high wind speed for a third set time or the temperature of the outdoor coil pipe is more than or equal to a third set temperature value, controlling the outer fan to start and returning to the step (1).
Still further, before controlling the outer fan to operate at the second set high wind speed, the method further comprises the following steps: adding 1 to the cycle number; judging whether the cycle times reach the set times or not; if so, controlling the air conditioner to stop, and resetting the cycle times; if not, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time.
Further, the first set time is 15 minutes to 25 minutes, the second set time is 2 minutes to 4 minutes, and the third set time is 20 seconds to 30 seconds.
Still further, the first set temperature value is 55-57 ℃, and the second set temperature value is 51-53 ℃.
Further, the third set temperature value is 3 ℃ to 5 ℃.
Further, the set number of times is 4 to 6.
An anti-frosting control system for an outdoor unit of an air conditioner, the system comprising: the heating operation module is used for controlling the heating operation of the air conditioner; the indoor coil temperature acquisition module is used for acquiring the temperature of the indoor coil; the outer fan control module is used for controlling the outer fan to stop when the temperature of the indoor coil pipe is larger than or equal to a first set temperature value; the outdoor fan control system is also used for controlling the outdoor fan to start and resetting the shutdown time when the shutdown time of the outdoor fan reaches a first set time and the temperature of the indoor coil pipe is less than or equal to a second set temperature value; the air conditioner is also used for controlling the starting of the outer fan and resetting the shutdown time when the inner fan runs at the first set high wind speed for a second set time and if the temperature of the indoor coil pipe is less than or equal to a second set temperature value; if the temperature of the indoor coil pipe is larger than a second set temperature value, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time; when the outer fan runs at the second set high wind speed for a third set time, controlling the outer fan to start; the first judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value when the shutdown time of the outer fan reaches a first set time; the inner fan control module is used for controlling the inner fan to operate at a first set high wind speed when the shutdown time of the outer fan reaches a first set time and the temperature of the indoor coil pipe is greater than a second set temperature value; and the second judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value or not when the inner fan runs at the first set high wind speed for a second set time.
Further, the system further comprises: the outdoor coil temperature acquisition module is used for monitoring the outdoor coil temperature in real time when the external fan runs at a second set high wind speed; and the outer fan control module is also used for controlling the outer fan to start when the outer fan runs at a second set high wind speed for a third set time or the temperature of the outdoor coil pipe is more than or equal to a third set temperature value.
Still further, the system further comprises: the cycle count module is used for calculating the cycle plus 1; the cycle number judging module is used for judging whether the cycle number reaches the set number; and the stop control module is used for controlling the air conditioner to stop when the cycle number reaches the set number, and resetting the cycle number.
Compared with the prior art, the invention has the advantages and positive effects that: according to the anti-frosting control method and system for the outdoor unit of the air conditioner, when the temperature of the indoor coil pipe is larger than or equal to a first set temperature value, the external fan is controlled to stop; when the shutdown time of the outer fan reaches a first set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, controlling the outer fan to start; otherwise, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, the outer fan is controlled to start; otherwise, controlling the outer fan to operate at a second set high wind speed, and controlling the outer fan to start when the outer fan operates at the second set high wind speed for a third set time; therefore, the frosting of the outdoor heat exchanger caused by the shutdown of the outer fan is effectively avoided, and the phenomenon that the heating capacity is reduced and even the compressor is hit by liquid is avoided.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a flowchart illustrating an embodiment of an anti-frosting control method for an outdoor unit of an air conditioner according to the present invention;
fig. 2 is a flowchart illustrating another embodiment of an anti-frosting method for an outdoor unit of an air conditioner according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The embodiment provides an anti-frosting control method and system for an air conditioner outdoor unit, which are used for solving the problems that when an air conditioner is in heating operation, an external fan cannot be restarted after being stopped, so that frosting occurs to an outdoor heat exchanger, the heating capacity is reduced and the like. Next, the method for controlling the anti-frosting of the outdoor unit of the air conditioner according to the present embodiment will be described in detail.
The method for controlling the outdoor unit of the air conditioner to prevent frosting of the outdoor unit of the air conditioner mainly includes the following steps, which are shown in fig. 1.
Step S1: and (5) heating operation of an air conditioner.
When the air conditioner normally heats, the inner fan operates at a normal heating wind speed, and the outer fan operates at a normal heating wind speed.
Step S2: and acquiring the temperature of the indoor coil, and controlling the external fan to stop when the system pressure of the air conditioner is higher than or equal to a first set temperature value T1, so that the system pressure of the air conditioner is reduced. When the outer fan is stopped, the stop time is timed.
Normally, when the external fan is stopped, the system pressure of the air conditioner is reduced, and the temperature of the indoor coil is also reduced.
In the present embodiment, the first set temperature value T1 is 55 to 57 ℃. The value range is selected, so that the situation that the normal heating operation of the air conditioner is influenced due to frequent shutdown of an outer fan caused by too low value is avoided, and the situation that the safe operation of the air conditioner is influenced due to too high pressure of an air conditioning system caused by too high value is also avoided. As a preferable design of this embodiment, the first set temperature value T1 is 56 ℃.
Step S3: and when the shutdown time of the outer fan reaches a first set time, acquiring the temperature of the indoor coil at the moment.
In the present embodiment, the first set time is 15 minutes to 25 minutes. The value range is selected, so that the condition that the temperature of the indoor coil pipe does not have enough time and sufficiently drops to influence subsequent judgment due to too short shutdown time is avoided, and the condition that the outdoor heat exchanger frosts due to too long shutdown time is also avoided. As a preferable configuration of this embodiment, the first set time is 20 minutes.
Step S4: and judging whether the temperature of the indoor coil at the moment is less than or equal to a second set temperature value T2. Wherein, the second set temperature value T2 is less than the first set temperature value T1.
If yes, it indicates that the system pressure of the air conditioner is reduced to the normal range, and the indoor coil temperature meets the requirement during normal heating, then step S5 is executed: the outer fan is controlled to start, the downtime is cleared, and the process returns to S1.
If not, it indicates that the indoor coil temperature does not meet the normal heating requirement, then step S6 is executed: and controlling the inner fan to operate at a first set high wind speed.
When the inner fan runs at high wind speed, the temperature of the indoor coil pipe also drops. The wind speed gear of interior fan includes low wind gear, well windshield, high wind gear, and the first high wind speed that sets for is located high wind gear.
In the present embodiment, second set temperature value T2 is 51 to 53 ℃. The value range is selected, so that the situation that the normal heating starting of the air conditioner is influenced due to the fact that the outer fan cannot be started normally due to too low value is avoided, and the situation that the safe operation of the air conditioner is influenced due to too high value is also avoided. As a preferable design of this embodiment, the second set temperature value T2 is 52 ℃.
S7: and when the inner fan runs at the first set high wind speed for a second set time, acquiring the temperature of the indoor coil at the moment.
In the present embodiment, the second set time is 2 minutes to 4 minutes. The value range is selected, so that the condition that the temperature of the indoor coil pipe does not have enough time to sufficiently reduce and influence subsequent judgment due to too short time is avoided, and the condition that the execution of subsequent steps is influenced due to too long time and the frosting of the outdoor heat exchanger is caused is also avoided. As a preferable configuration of this embodiment, the second set time is 3 minutes.
Step S8: and judging whether the temperature of the indoor coil at the moment is less than or equal to a second set temperature value T2.
If yes, the indoor coil temperature reaches the requirement in normal heating, then step S9 is executed: and controlling the external fan to start, clearing the shutdown time and returning to S1.
If not, it indicates that the indoor coil temperature does not meet the normal heating requirement, then step S10 is executed: and controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time. Because the external fan does not recover to start for a long time, the outdoor heat exchanger may frost, so that the external fan is forced to operate at a high wind speed, and the frosting phenomenon of the outdoor heat exchanger is avoided.
The wind speed gears of the outer fan comprise a low wind gear, a middle wind gear and a high wind gear, and the second set high wind speed is located at the high wind gear.
S11: and judging whether the operation of the outer fan at the second set high wind speed reaches a third set time.
If yes, it is stated that the operation of the external fan at the second set high wind speed reaches the third set time, that is, the time for operating the external fan to defrost the outdoor heat exchanger is enough, and the effect of avoiding frosting of the outdoor heat exchanger is achieved, then step S12 is executed: and controlling the outer fan to start and returning to the S1.
In the present embodiment, the third set time is 20 seconds to 30 seconds. The value range is selected, so that the phenomenon that the defrosting time is too short and the defrosting effect is influenced due to too short time is avoided, and the phenomenon that the defrosting time is too short and the normal heating operation of the air conditioner is influenced due to too long time is also avoided. As a preferable design of this embodiment, the third setting time is 25 seconds.
According to the control method for preventing the outdoor unit of the air conditioner from frosting, when the temperature of the indoor coil pipe is larger than or equal to the first set temperature value, the outdoor fan is controlled to stop; when the shutdown time of the outer fan reaches a first set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, controlling the outer fan to start; otherwise, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, the outer fan is controlled to start; otherwise, controlling the outer fan to operate at a second set high wind speed, and controlling the outer fan to start when the outer fan operates at the second set high wind speed for a third set time; therefore, the frosting of the outdoor heat exchanger caused by the halt of the outer fan is effectively avoided, and the phenomenon that the heating capacity is reduced and even the compressor is hit by liquid is avoided; moreover, the control method of the embodiment is simple to control and convenient to implement.
In this embodiment, in order to avoid frosting of the outdoor heat exchanger and enable the air conditioner to operate normally as soon as possible, S11 specifically includes:
(1) and when the outer fan runs at a second set high wind speed, monitoring the temperature of the outdoor coil in real time.
(2) And judging whether the operation of the outer fan at the second set high wind speed reaches a third set time or whether the temperature of the outdoor coil pipe is more than or equal to a third set temperature value T3.
When the outer fan runs at the second set high wind speed for the third set time, the effect of avoiding frosting of the outdoor heat exchanger is achieved; when the temperature of the outdoor coil pipe is larger than or equal to the third set temperature value T3, the temperature of the outdoor coil pipe is higher, and the frosting phenomenon of the outdoor heat exchanger cannot occur.
If yes, namely when the external fan runs at the second set high wind speed for the third set time or the temperature of the outdoor coil pipe is greater than or equal to the third set temperature value T3, the outdoor heat exchanger does not frost, and the step S12 is executed: and controlling the external fan to start, returning to S1, and continuing heating operation of the air conditioner.
In the present embodiment, third set temperature value T3 is 3 to 5 ℃. The value range is selected, so that the frosting of the outdoor heat exchanger and the influence on the heating capacity caused by too low value are avoided, and the influence on the normal heating operation of the air conditioner caused by too high value is also avoided. As a preferable design of this embodiment, the third set temperature value T3 is 4 ℃.
In order to avoid the air conditioner from being trapped in the dead loop, when the indoor coil temperature is determined to be not less than the second set temperature value T2 in step S8, the following steps are further included before step S10 is executed, as shown in fig. 2.
S10-1: the number of cycles is increased by 1.
S10-2: and judging whether the circulation times reach the set times.
If yes, it indicates that the number of cycles reaches the set number, the air conditioner has already entered this step multiple times, and the air conditioner may malfunction, then S10-3 is executed: and controlling the air conditioner to stop, resetting the cycle times, and giving an alarm to prompt that a fault occurs so as to be convenient for timely maintenance.
If not, it is described that the number of cycles has not reached the set number of cycles, then S10 is executed: and controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time.
In the present embodiment, the set number of times is 4 to 6. The value range is selected, so that the condition that the air conditioner is frequently stopped and normal heating operation of the air conditioner is influenced due to too few circulation times is avoided, and the condition that the safety of the air conditioner is influenced due to too many circulation times is also avoided. As a preferable configuration of this embodiment, the set number is 5.
The control method for preventing frosting of the outdoor unit of the air conditioner mainly solves the problem that the frosting phenomenon of the outdoor heat exchanger occurs due to the fact that the temperature of the inner coil cannot be timely recovered to the second set temperature value T2 after the outer fan is shut down when the air conditioner runs in a high-load heating mode, and avoids the phenomena that the heating capacity is reduced and the liquid hits a compressor.
Based on the design of the above anti-frosting control method for the outdoor unit of the air conditioner, the present embodiment further provides an anti-frosting control system for the outdoor unit of the air conditioner, which includes:
and the heating operation module is used for controlling the heating operation of the air conditioner.
And the indoor coil temperature acquisition module is used for acquiring the indoor coil temperature.
And the outer fan control module is used for controlling the outer fan to stop when the temperature of the indoor coil pipe is larger than or equal to a first set temperature value.
And the outer fan control module is also used for controlling the outer fan to start and resetting the shutdown time when the shutdown time of the outer fan reaches a first set time and the temperature of the indoor coil pipe is less than or equal to a second set temperature value.
The outer fan control module is also used for controlling the outer fan to start and resetting the shutdown time if the temperature of the indoor coil pipe is less than or equal to a second set temperature value when the inner fan runs at a first set high wind speed for a second set time; if the temperature of the indoor coil pipe is larger than a second set temperature value, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time; and when the outer fan runs at the second set high wind speed for a third set time, controlling the outer fan to start.
And the first judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value when the shutdown time of the outer fan reaches a first set time.
And the inner fan control module is used for controlling the inner fan to operate at a first set high wind speed when the shutdown time of the outer fan reaches a first set time and the temperature of the indoor coil pipe is greater than a second set temperature value.
And the second judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value or not when the inner fan runs at the first set high wind speed for a second set time.
The system further comprises an outdoor coil temperature acquisition module and an outer fan control module.
And the outdoor coil temperature acquisition module is used for monitoring the outdoor coil temperature in real time when the outer fan runs at a second set high wind speed.
And the outer fan control module is also used for controlling the outer fan to start when the outer fan runs at a second set high wind speed for a third set time or the temperature of the outdoor coil pipe is more than or equal to a third set temperature value.
The system also comprises a cycle number counting module, a cycle number judging module and a shutdown control module.
And the cycle count module is used for calculating the cycle count plus 1.
And the cycle number judging module is used for judging whether the cycle number reaches the set number.
And the stop control module is used for controlling the air conditioner to stop when the cycle number reaches the set number, and resetting the cycle number.
The working process of the anti-frosting control system of the outdoor unit of the air conditioner has been described in detail in the above-mentioned anti-frosting control method, and is not described herein again.
The anti-frosting control system for the outdoor unit of the air conditioner controls the external fan to stop when the temperature of the indoor coil pipe is larger than or equal to a first set temperature value; when the shutdown time of the outer fan reaches a first set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, controlling the outer fan to start; otherwise, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, if the temperature of the indoor coil pipe is less than or equal to a second set temperature value, the outer fan is controlled to start; otherwise, controlling the outer fan to operate at a second set high wind speed, and controlling the outer fan to start when the outer fan operates at the second set high wind speed for a third set time; therefore, the frosting of the outdoor heat exchanger caused by the shutdown of the outer fan is effectively avoided, and the phenomenon that the heating capacity is reduced and even the compressor is hit by liquid is avoided.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. An anti-frosting control method for an air conditioner outdoor unit is characterized by comprising the following steps: the control method comprises the following steps:
(1) air-conditioning heating operation;
(2) acquiring the temperature of an indoor coil, and controlling an outer fan to stop when the temperature of the indoor coil is larger than or equal to a first set temperature value; when the shutdown time of the external fan reaches a first set time, judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value; wherein the second set temperature value is less than the first set temperature value;
if yes, controlling the external fan to start, resetting the shutdown time, and returning to the step (1);
if not, controlling the inner fan to operate at a first set high wind speed; when the inner fan runs at a first set high wind speed for a second set time, judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value;
if yes, controlling the external fan to start, resetting the shutdown time, and returning to the step (1);
if not, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time; and (5) controlling the outer fan to start when the outer fan runs at the second set high wind speed for a third set time, and returning to the step (1).
2. The control method according to claim 1, characterized in that: the control method further comprises the following steps:
when the outer fan runs at a second set high wind speed, monitoring the temperature of the outdoor coil pipe in real time;
and (3) when the outer fan runs at a second set high wind speed for a third set time or the temperature of the outdoor coil pipe is more than or equal to a third set temperature value, controlling the outer fan to start and returning to the step (1).
3. The control method according to claim 1 or 2, characterized in that: before controlling the outer fan to operate at the second set high wind speed, the method further comprises the following steps:
adding 1 to the cycle number;
judging whether the cycle times reach the set times or not;
if so, controlling the air conditioner to stop, and resetting the cycle times;
if not, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time.
4. The control method according to claim 1, characterized in that: the first set time is 15 minutes to 25 minutes, the second set time is 2 minutes to 4 minutes, and the third set time is 20 seconds to 30 seconds.
5. The control method according to claim 1, characterized in that: the first set temperature value is 55-57 deg.C, and the second set temperature value is 51-53 deg.C.
6. The control method according to claim 2, characterized in that: the third set temperature value is 3-5 ℃.
7. The control method according to claim 3, characterized in that: the set number of times is 4-6.
8. The utility model provides an air condensing units frost prevention control system which characterized in that: the system comprises:
the heating operation module is used for controlling the heating operation of the air conditioner;
the indoor coil temperature acquisition module is used for acquiring the temperature of the indoor coil;
the outer fan control module is used for controlling the outer fan to stop when the temperature of the indoor coil pipe is larger than or equal to a first set temperature value;
the outdoor fan control system is also used for controlling the outdoor fan to start and resetting the shutdown time when the shutdown time of the outdoor fan reaches a first set time and the temperature of the indoor coil pipe is less than or equal to a second set temperature value;
the air conditioner is also used for controlling the starting of the outer fan and resetting the shutdown time when the inner fan runs at the first set high wind speed for a second set time and if the temperature of the indoor coil pipe is less than or equal to a second set temperature value; if the temperature of the indoor coil pipe is larger than a second set temperature value, controlling the outer fan to operate at a second set high wind speed, and resetting the shutdown time; when the outer fan runs at the second set high wind speed for a third set time, controlling the outer fan to start;
the first judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value when the shutdown time of the outer fan reaches a first set time;
the inner fan control module is used for controlling the inner fan to operate at a first set high wind speed when the shutdown time of the outer fan reaches a first set time and the temperature of the indoor coil pipe is greater than a second set temperature value;
and the second judgment module is used for judging whether the temperature of the indoor coil pipe at the moment is less than or equal to a second set temperature value or not when the inner fan runs at the first set high wind speed for a second set time.
9. The control system of claim 8, wherein: the system further comprises:
the outdoor coil temperature acquisition module is used for monitoring the outdoor coil temperature in real time when the external fan runs at a second set high wind speed;
and the outer fan control module is also used for controlling the outer fan to start when the outer fan runs at a second set high wind speed for a third set time or the temperature of the outdoor coil pipe is more than or equal to a third set temperature value.
10. The control system of claim 8, wherein: the system further comprises:
the cycle count module is used for calculating the cycle plus 1;
the cycle number judging module is used for judging whether the cycle number reaches the set number;
and the stop control module is used for controlling the air conditioner to stop when the cycle number reaches the set number, and resetting the cycle number.
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| CN113217956B (en) * | 2020-01-21 | 2022-07-26 | 宁波方太厨具有限公司 | Anti-icing method for indoor and outdoor machines of centralized smoke exhaust system of building |
| CN114151927B (en) * | 2021-11-26 | 2023-02-10 | 宁波奥克斯电气股份有限公司 | Anti-frosting control method and device and air conditioner |
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| CN107192012A (en) * | 2017-05-03 | 2017-09-22 | 青岛海尔空调电子有限公司 | Splitting heat pump air conditioner and the method for delaying its frosting |
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