CN113865011A - Air source heat pump system defrosting control method and device and air source heat pump system - Google Patents
Air source heat pump system defrosting control method and device and air source heat pump system Download PDFInfo
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- 238000010257 thawing Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 62
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- 230000008901 benefit Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
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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
- F24F11/62—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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
- F24F2110/32—Velocity of the outside air
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- Defrosting Systems (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method and device for an air source heat pump system and the air source heat pump system, and belongs to the field of defrosting control. Firstly, acquiring an actual head-on wind speed and a theoretical head-on wind speed of a heat pump system in a current state, and then judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not; and finally, after the air source heat pump system starts the defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt. According to the technical scheme, after the defrosting mode of the air source heat pump system is started, the ratio of the actual head-on wind speed to the theoretical head-on wind speed is compared with a preset ratio; whether the heat pump system breaks down or not is judged according to the comparison result, whether the heat pump system sends a fault prompt or not is controlled, fault detection can be carried out on the heat pump system in the defrosting process, the problem that the defrosting process cannot be accurately controlled is solved, and the defrosting control method has the advantages of convenience in detection and accuracy in control.
Description
Technical Field
The invention relates to the field of defrosting control, in particular to a defrosting control method and device for an air source heat pump system and the air source heat pump system.
Background
The air source heat pump system can have the phenomenon of frosting when the air source heat pump system runs in the low temperature environment in winter, and aiming at the problem, the existing system mostly adopts an increased defrosting mode to process. In order to ensure the working efficiency and the service life of the unit, the starting time point of the defrosting process and the defrosting duration time need to be accurately controlled. Therefore, the system plays a crucial role for the control method of the defrost mode.
In the prior art, the judgment of the defrosting mode of the air source heat pump system is mainly to judge whether the system starts the defrosting mode or whether to quit the defrosting mode according to parameters such as the temperature of an outer coil, the difference value between the temperature of the outer coil and the indoor temperature, the temperature of the indoor coil and the working state of an outer fan, and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a defrosting control method and device for an air source heat pump system and the air source heat pump system, and aims to solve the problems that whether the heat pump system fails or not can not be detected in the defrosting process and the defrosting process cannot be accurately controlled in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect,
a defrosting control method for an air source heat pump system comprises the following steps:
acquiring actual head-on wind speed and theoretical head-on wind speed of the heat pump system in the current working state;
judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not;
and after the air source heat pump system starts a defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt.
Further, the acquiring the actual head-on wind speed of the heat pump system in the current working state comprises: and acquiring the air speed of an air outlet of the outdoor unit of the heat pump system.
Further, the acquiring the theoretical head-on wind speed of the heat pump system in the current working state includes:
acquiring the load factor of the heat pump system in the current working state;
and matching the load rate with a preset load rate in unit parameters to obtain a theoretical head-on wind speed corresponding to the preset load rate as the theoretical head-on wind speed in the current state.
Further, the controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to the judgment result comprises:
and when the ratio is not less than the second preset ratio and lasts for a third preset duration, controlling the heat pump system to exit the defrosting mode and not sending a fault prompt.
Further, the controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to the judgment result comprises:
when the ratio is smaller than a second preset ratio, acquiring a numerical value of a parameter for judging that the defrosting mode exits;
judging whether the numerical value of the parameter reaches a threshold value for exiting the defrosting mode;
if yes, acquiring defrosting operation time of the heat pump system;
and if the defrosting operation time is longer than a fourth preset time, controlling the heat pump system to exit the defrosting mode, and meanwhile, judging the air source heat pump system to have a fault and sending a fault prompt.
Further, the judging the air source heat pump system fault comprises any one of the following faults:
-fan aging in the air source heat pump system;
the heat exchanger in the air source heat pump system is blocked.
Further, the air source heat pump system starting the defrosting mode comprises the following steps:
and when the ratio is smaller than a first preset ratio, controlling the heat pump system to start a defrosting mode.
Further, still include:
when the ratio is not less than a first preset ratio and lasts for a first preset duration, acquiring a numerical value of a parameter for judging whether to start a defrosting mode;
judging whether the numerical value of the parameter reaches a threshold value for starting a defrosting mode;
and if so, controlling the heat pump system to start a defrosting mode.
Further, before controlling the heat pump system to start the defrosting mode, the method further comprises the following steps:
acquiring the running time of a compressor of the heat pump system;
and if the defrosting time is longer than a second preset time, controlling the heat pump system to start a defrosting mode.
Further, the air conditioner is provided with a fan,
the obtaining of the value of the parameter for judging whether to start the defrost mode or the value of the parameter for judging whether to exit the defrost mode includes:
acquiring at least one of the following parameters:
the temperature of the outer coil;
difference between the outside coil and the indoor temperature;
indoor coil temperature;
and the working state of the outer fan.
In a second aspect of the present invention,
an air source heat pump system defrost control apparatus comprising:
the wind speed acquisition module is used for acquiring the actual head-on wind speed and the theoretical head-on wind speed of the heat pump system in the current working state;
the ratio judgment module is used for judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not;
and the defrosting control module is used for controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to a judgment result after the air source heat pump system starts the defrosting mode and runs for a preset time.
In a third aspect,
an air-source heat pump system comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to perform the method of any one of the aspects provided in the first aspect.
Has the advantages that:
the technical scheme of the application provides a defrosting control method and device for an air source heat pump system and the air source heat pump system, firstly, the actual head-on wind speed and the theoretical head-on wind speed of the heat pump system in the current state are obtained, and then whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio is judged; and finally, after the air source heat pump system starts the defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt. According to the technical scheme, after the defrosting mode of the air source heat pump system is started, the ratio of the actual head-on wind speed to the theoretical head-on wind speed is compared with a preset ratio; whether the heat pump system breaks down or not is judged according to the comparison result, whether the heat pump system sends a fault prompt or not is controlled, fault detection can be carried out on the heat pump system in the defrosting process, the problem that the defrosting process cannot be accurately controlled is solved, and the defrosting control method has the advantages of convenience in detection and accuracy in control.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a defrosting control method for an air source heat pump system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling whether the air source heat pump system is in the defrosting mode according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for controlling whether the air source heat pump system exits the defrosting mode according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a defrosting control device of an air source heat pump system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
The noun explains: the head-on wind speed is the wind speed at the fins of the heat exchanger inside the outdoor unit of the heat pump system.
Referring to fig. 1, an embodiment of the present invention provides a defrosting control method for an air source heat pump system, including the following steps:
s11: acquiring actual head-on wind speed and theoretical head-on wind speed of a heat pump system in a current working state;
s12: judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not;
s13: and after the air source heat pump system starts the defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt.
The defrosting control method of the air source heat pump system provided by the embodiment of the invention comprises the steps of firstly obtaining the actual head-on wind speed and the theoretical head-on wind speed of the heat pump system in the current state, and then judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not; and finally, after the air source heat pump system starts the defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt. According to the technical scheme, after the defrosting mode of the air source heat pump system is started, the ratio of the actual head-on wind speed to the theoretical head-on wind speed is compared with a preset ratio; whether the heat pump system breaks down or not is judged according to the comparison result, whether the heat pump system sends a fault prompt or not is controlled, fault detection can be carried out on the heat pump system in the defrosting process, the problem that the defrosting process cannot be accurately controlled is solved, and the defrosting control method has the advantages of convenience in detection and accuracy in control.
Referring to fig. 2 and fig. 3, in order to further explain the above embodiment of the present invention, the embodiment of the present invention provides a specific implementation manner of controlling whether the heat pump system starts the defrosting mode or exits the defrosting mode according to the determination result.
As shown in fig. 2, controlling whether the heat pump system starts the defrost mode according to the determination result includes the following steps:
1. when the system normally heats and operates, according to the circulating air volume V1 and the air outlet area S in the current operation state, the theoretical head-on air speed U1 is V1/S through the calculation unit; it should be noted that the circulating air volume is the air volume of the outdoor unit (air enters from the air return surface of the outdoor unit, and flows out from the air outlet after heat exchange by the heat exchanger fins, and the air volume of the air inlet and the air outlet is equal), and the area of the air outlet is the area of the air outlet of the outdoor unit. Under different load rates of the air conditioner, the air quantity at the air outlet of the outdoor unit is the circulating air quantity (the measured air quantity is the measured air quantity, and V1 is the theoretical circulating air quantity which is the data given in the unit parameters, for example, the circulating air quantity is A1 under the rated working condition, the circulating air quantity is A2 under the condition of 50% load rate, the data is the unit parameters, the theoretical head-on air speed is calculated by utilizing the A1 or A2 by combining the area of the air outlet, and then the theoretical head-on air speed is compared with the actually measured head-on air speed.)
2. Detecting the actual head-on wind speed Ua of the outdoor unit through a sensor and the like;
3. judging whether the detected actual head-on wind speed is: the ratio set value of the wind speed is more than or equal to the calculated wind speed, namely Ua is more than or equal to X1% U1, and the ratio set value lasts for a first preset time period T1;
3.1 if yes, judging whether other defrosting conditions are met under the current state;
3.1.1, if yes, judging whether the working time of the compressor exceeds a second preset time T2;
if yes, controlling the heat pump system to start a defrosting mode;
if not, returning to the step 1 and repeating the steps;
3.2 if not, then go to step 3.1.1.
As shown in fig. 3, controlling whether the heat pump system exits the defrosting mode according to the determination result includes the following steps:
4. when the system operates in a defrosting mode, according to the circulating air volume V2 and the air outlet area S in the current operating state, the theoretical head-on air speed U2 is obtained as V2/S through a calculating unit;
5. detecting the actual head-on wind speed Ub of the outdoor unit;
6. judging whether the detected actual head-on wind speed is larger than or equal to a proportional set value of the calculated wind speed, namely Ub is larger than or equal to X2% U2 and lasts for a third preset time period T3;
7.1 if not, judging whether other defrosting ending conditions are met under the current state;
if so, judging whether the defrosting operation is longer than a fourth preset time period T4;
if so, controlling the heat pump system to exit the defrosting mode and sending a fault alarm prompt;
if not, returning to the step 4, and repeating the judging steps;
7.1.2 if not, returning to the step 4, and repeating the judging steps;
and 7.2 if so, controlling the heat pump system to exit the defrosting mode.
It should be noted that the remaining defrosting conditions or the remaining defrosting end conditions mentioned in the embodiments of the present invention are common means for determining the defrosting condition of the outdoor unit in the art, and the obtained parameters include, but are not limited to: the temperature of the outer coil, the difference value between the temperature of the outer coil and the indoor temperature, the temperature of the indoor coil or the working state of the outer fan. How to judge defrosting according to these parameters is a common technical means in the field and will not be described in detail here.
In addition, the wind speed at the position of the air outlet of the outdoor unit is detected to replace the actual head-on wind speed in the embodiment of the invention.
According to the control method provided by the embodiment of the invention, the frosting condition of the unit is judged by detecting the actual head-on wind speed of the heat exchanger of the outdoor unit of the system, the starting time point and the process time of the defrosting process are controlled, the working abnormal state of the outdoor unit component can be found in time, and the fault alarm information is prompted. By utilizing the design, the head-on wind speed of the outdoor unit can be kept in a high wind speed state, the vicious cycle acceleration process of frosting is effectively reduced, the running time of the defrosting process is shortened, the temperature fluctuation change caused by starting the defrosting mode is reduced, the system energy efficiency is improved, the service life of the unit is prolonged, and the overall economic benefit of the system is improved. The control method provided by the embodiment of the invention is additionally provided with a control method for detecting the head-on wind speed of the heat exchanger of the outdoor unit on the basis of the original defrosting judgment standard, and can be used for carrying out defrosting action and fault alarming action on the system by integrating the head-on wind speed and the judgment results of other defrosting conditions.
In one embodiment, the present invention provides a defrosting control device for an air source heat pump system, as shown in fig. 4, including:
the wind speed obtaining module 41 is configured to obtain an actual head-on wind speed and a theoretical head-on wind speed of the heat pump system in a current working state;
specifically, the wind speed obtaining module 41 obtains the wind speed at the air outlet of the outdoor unit of the heat pump system as the head-on wind speed in the current working state. The wind speed obtaining module 41 obtains the load factor of the heat pump system in the current working state; and matching the load rate with a preset load rate in the unit parameters to obtain a theoretical head-on wind speed corresponding to the preset load rate as the theoretical head-on wind speed in the current state.
A ratio judgment module 42, configured to judge whether a ratio of the actual windward speed to the theoretical windward speed is smaller than a preset ratio;
and the defrosting control module 43 is configured to control whether the heat pump system exits the defrosting mode and send a fault prompt according to the determination result after the air source heat pump system starts the defrosting mode and operates for a preset time.
It should be noted that, when determining whether to start the defrosting mode and when determining whether to exit the defrosting mode, the preset ratios adopted by the ratio determination module 42 may be the same or different, and for convenience of description, the first preset ratio is used as the preset ratio for determining to start the defrosting mode, and the second preset ratio is used as the preset ratio for determining to exit the defrosting mode.
The specific control process of the defrost control module 43 is as follows:
controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to the judgment result comprises the following steps:
when the ratio is not less than the second preset ratio and continues for the third preset duration, the defrosting control module 43 controls the heat pump system to exit the defrosting mode and does not send a fault prompt.
When the ratio is smaller than a second preset ratio, acquiring a numerical value of a parameter for judging that the defrosting mode exits;
judging whether the numerical value of the parameter reaches a threshold value for exiting the defrosting mode;
if yes, acquiring defrosting operation time of the heat pump system;
if the defrosting operation time is longer than the fourth preset time, the defrosting control module 43 controls the heat pump system to exit the defrosting mode, and meanwhile, judges the air source heat pump system to have a fault and sends a fault prompt.
It should be noted that, the determining of the failure of the air source heat pump system includes any one of the following failures: aging of a fan in the air source heat pump system; the heat exchanger in the air source heat pump system is blocked. The principle is as follows, when the ratio is smaller than a second preset ratio, it is indicated that the actual head-on wind speed is lower than the required head-on wind speed, but at this time, it is judged that the heat exchanger does not frost according to other parameters, and theoretically, the actual head-on wind speed is the same as the theoretical head-on wind speed at this time, or the ratio is not smaller than the second preset ratio. Namely, under the condition of no frosting, the head-on wind speed of the heat pump system is reduced, and the judgment is that the fan is aged, the actual wind speed cannot reach the theoretical wind speed, or the heat exchanger is blocked due to reasons other than frosting, so that the wind speed is influenced. After the fault prompt is sent out, the fan or the heat exchanger can be further detected by workers conveniently, so that specific reasons can be determined.
Judging whether to start the defrosting mode includes:
when the ratio is smaller than the first preset ratio, the defrost control module 43 controls the heat pump system to start the defrost mode.
When the ratio is not less than the first preset ratio and the first preset duration continues, acquiring a numerical value of a parameter for judging whether to start the defrosting mode; judging whether the numerical value of the parameter reaches a threshold value for starting a defrosting mode; if so, the defrost control module 43 controls the heat pump system to start the defrost mode.
In the actual control process, in order to avoid frequent start and stop of the compressor, before the heat pump system is controlled to start the defrosting mode, the method further comprises the following steps: acquiring the running time of a compressor of the heat pump system; and if the defrosting time is longer than the second preset time, controlling the heat pump system to start a defrosting mode. And controlling the heat pump system to start the defrosting mode after at least ensuring that the running time of the compressor is greater than the second preset time.
It should be noted that obtaining the value of the parameter for determining to start the defrost mode or obtaining the value of the parameter for determining to exit the defrost mode includes: acquiring at least one of the following parameters: the temperature of the outer coil; difference between the outside coil and the indoor temperature; indoor coil temperature; and the working state of the outer fan. How to determine whether to start the defrost mode or to exit the defrost mode according to the parameters is a technical means in the art, and is not described in detail herein.
According to the defrosting control device of the air source heat pump system, provided by the embodiment of the invention, the wind speed acquisition module acquires the actual head-on wind speed and the theoretical head-on wind speed of the heat pump system in the current working state; the ratio judgment module judges whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not; and after the air source heat pump system starts a defrosting mode and runs for a preset time, the defrosting control module controls whether the heat pump system exits the defrosting mode or not according to a judgment result and sends a fault prompt. The control device provided by the embodiment of the invention detects the frosting degree of the heat exchanger of the outdoor unit through various data, determines the optimal defrosting time point and defrosting time of the air source heat pump system, detects the abnormal working condition of the outdoor unit equipment components, optimizes the defrosting period of the system and improves the operation stability and energy efficiency of the system.
In one embodiment, the present invention provides an air-source heat pump system comprising:
a processor;
a memory for storing processor-executable instructions;
the processor is configured to execute the defrosting control method of the air source heat pump system provided in the above embodiment of the invention.
According to the air heat source system provided by the embodiment of the invention, the executable instruction of the processor is stored by the memory, and the processor can judge the frosting condition of the unit by detecting the actual head-on wind speed of the heat exchanger of the outdoor unit of the system, control the starting time point and the process time of the defrosting process, find the working abnormal state of the outdoor unit component in time and prompt fault alarm information. By utilizing the design, the actual head-on wind speed of the outdoor unit can be kept in a higher wind speed state, the vicious cycle acceleration process of frosting is effectively reduced, the running time of the defrosting process is shortened, the temperature fluctuation change caused by starting the defrosting mode is reduced, the system energy efficiency is improved, the service life of the unit is prolonged, and the overall economic benefit of the system is improved.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (12)
1. A defrosting control method for an air source heat pump system is characterized by comprising the following steps:
acquiring actual head-on wind speed and theoretical head-on wind speed of the heat pump system in the current working state;
judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not;
and after the air source heat pump system starts a defrosting mode and runs for a preset time, controlling whether the heat pump system exits the defrosting mode or not according to a judgment result and sending a fault prompt.
2. The method of claim 1, wherein: the acquiring of the actual head-on wind speed of the heat pump system in the current working state comprises: and acquiring the air speed of an air outlet of the outdoor unit of the heat pump system.
3. The method of claim 1, wherein: the acquiring of the theoretical head-on wind speed of the heat pump system in the current working state comprises the following steps:
acquiring the load factor of the heat pump system in the current working state;
and matching the load rate with a preset load rate in unit parameters to obtain a theoretical head-on wind speed corresponding to the preset load rate as the theoretical head-on wind speed in the current state.
4. The method of claim 1, wherein: the step of controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to the judgment result comprises the following steps:
and when the ratio is not less than the second preset ratio and lasts for a third preset duration, controlling the heat pump system to exit the defrosting mode and not sending a fault prompt.
5. The method of claim 1, wherein: the step of controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to the judgment result comprises the following steps:
when the ratio is smaller than a second preset ratio, acquiring a numerical value of a parameter for judging that the defrosting mode exits;
judging whether the numerical value of the parameter reaches a threshold value for exiting the defrosting mode;
if yes, acquiring defrosting operation time of the heat pump system;
and if the defrosting operation time is longer than a fourth preset time, controlling the heat pump system to exit the defrosting mode, and meanwhile, judging the air source heat pump system to have a fault and sending a fault prompt.
6. The method of claim 5, wherein: the judging of the air source heat pump system fault comprises any one of the following faults:
-fan aging in the air source heat pump system;
the heat exchanger in the air source heat pump system is blocked.
7. The method of claim 1, wherein: the defrosting mode of the air source heat pump system comprises the following steps:
and when the ratio is smaller than a first preset ratio, controlling the heat pump system to start a defrosting mode.
8. The method of claim 7, further comprising:
when the ratio is not less than a first preset ratio and lasts for a first preset duration, acquiring a numerical value of a parameter for judging whether to start a defrosting mode;
judging whether the numerical value of the parameter reaches a threshold value for starting a defrosting mode;
and if so, controlling the heat pump system to start a defrosting mode.
9. The method according to claim 7 or 8, characterized in that: before controlling the heat pump system to start the defrosting mode, the method further comprises the following steps:
acquiring the running time of a compressor of the heat pump system;
and if the defrosting time is longer than a second preset time, controlling the heat pump system to start a defrosting mode.
10. The method according to claim 5 or 8, characterized in that: the obtaining of the value of the parameter for judging whether to start the defrost mode or the value of the parameter for judging whether to exit the defrost mode includes:
acquiring at least one of the following parameters:
the temperature of the outer coil;
difference between the outside coil and the indoor temperature;
indoor coil temperature;
and the working state of the outer fan.
11. An air source heat pump system defrost control apparatus comprising:
the wind speed acquisition module is used for acquiring the actual head-on wind speed and the theoretical head-on wind speed of the heat pump system in the current working state;
the ratio judgment module is used for judging whether the ratio of the actual head-on wind speed to the theoretical head-on wind speed is smaller than a preset ratio or not;
and the defrosting control module is used for controlling whether the heat pump system exits the defrosting mode and sending a fault prompt according to a judgment result after the air source heat pump system starts the defrosting mode and runs for a preset time.
12. An air-source heat pump system, comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to perform the method of any one of claims 1-10.
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