CN111964300B - Control method and device of air source heat pump equipment, equipment and readable storage medium - Google Patents
Control method and device of air source heat pump equipment, equipment and readable storage medium Download PDFInfo
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- CN111964300B CN111964300B CN202010826040.7A CN202010826040A CN111964300B CN 111964300 B CN111964300 B CN 111964300B CN 202010826040 A CN202010826040 A CN 202010826040A CN 111964300 B CN111964300 B CN 111964300B
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Power Engineering (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method, a control device, equipment and a readable storage medium of an air source heat pump device, wherein the control method comprises the following steps: acquiring an ambient temperature and a first temperature of an evaporator inlet of an air source heat pump device; and controlling the air source heat pump equipment to adjust the operation parameters based on the condition that the ambient temperature is greater than the first threshold value and the first temperature meets the pre-defrosting condition. By applying the embodiment of the invention, the air source heat pump equipment can pre-defrost the evaporator through the heat of the external environment under the condition of no shutdown by setting the pre-defrosting mode, thereby effectively avoiding the temperature reduction of air at a user side or the temperature reduction of a water tank at the user side caused by the reversing of the four-way valve when the evaporator is frosted less, reducing the heating capacity and energy efficiency attenuation of the heat pump, reducing the pressure impact on the system caused by the reversing of the four-way valve, further improving the running reliability of the system, prolonging the service life of the equipment and improving the use experience of users.
Description
Technical Field
The invention relates to the technical field of air source heat pump equipment, in particular to a control method of the air source heat pump equipment, a control device of the air source heat pump equipment, the air source heat pump equipment and a computer readable storage medium.
Background
In the related art, when the air source heat pump equipment is used for heating, defrosting is generally executed according to the heating operation time, and the defrosting mode is actually to switch the conduction direction of a four-way valve, which is equivalent to controlling the air source heat pump equipment to enter a refrigeration mode, so that frequent defrosting can seriously affect the heating effect of the air source heat pump equipment, affect user experience, have large pressure impact on a system, and greatly reduce the reliability of the system and the service life of the equipment.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes a control method of an air-source heat pump apparatus.
A second aspect of the invention proposes a control device of an air-source heat pump apparatus.
A third aspect of the invention provides an air-source heat pump apparatus.
A fourth aspect of the present invention is directed to a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides a control method for an air-source heat pump apparatus, including: acquiring an ambient temperature and a first temperature of an evaporator inlet of an air source heat pump device; and controlling the air source heat pump equipment to adjust the operation parameters based on the condition that the ambient temperature is greater than the first threshold value and the first temperature meets the pre-defrosting condition.
In the technical scheme, the embodiment of the invention provides a 'pre-defrosting mode', and specifically, whether the current evaporator is frosted or not is judged by acquiring the ambient temperature and the inlet temperature of the evaporator, and whether the inlet temperature of the evaporator meets the pre-defrosting condition or not is judged by combining the outdoor ambient temperature. When the pre-defrosting condition is met, the evaporator can be defrosted through the natural environment by controlling the air source heat pump equipment to adjust the operation parameters, such as adjusting the operation frequency of a compressor, adjusting the rotating speed of a fan and adjusting the opening of throttling components such as an electronic expansion valve, so that the problem of poor heating effect caused by reversing of a four-way valve in the traditional defrosting mode is avoided.
Specifically, when the air-source heat pump apparatus operates in the heating mode, moisture in the air may adhere to the surface of the evaporator and form frost due to the low temperature of the evaporator, which may reduce the heat exchange efficiency of the evaporator. Therefore, the air source heat pump device can be controlled to enter a 'pre-defrosting mode', specifically, the running parameters are adjusted to remove the frost attached to the surface of the evaporator.
The first threshold value is a preset environment temperature threshold value, if the outdoor environment temperature is larger than the first threshold value, the outdoor environment temperature is judged to be higher than the frosting temperature, at the moment, the frosting attached to the surface of the evaporator can be effectively removed by enabling the evaporator to perform heat exchange with the outdoor environment, therefore, if the inlet temperature of the evaporator meets the pre-defrosting regulation at the same time, the air source heat pump equipment can be controlled to adjust the operation parameters to defrost so as to remove the frosting attached to the surface of the evaporator, the heat exchange efficiency of the evaporator is improved so as to ensure the heating capacity of the air source heat pump equipment, and meanwhile, the reversing of the four-way valve is avoided.
By applying the embodiment of the invention, the air source heat pump equipment can be subjected to pre-defrosting through the external environment by setting the pre-defrosting mode, so that the temperature reduction of air at a user side or the temperature reduction of a water tank at the user side caused by the reversing of the four-way valve when the evaporator is not frosted is effectively avoided, the heating capacity and the energy efficiency attenuation of the heat pump are smaller, the pressure impact on the system caused by the reversing of the four-way valve can be reduced, the running reliability of the system is improved, the service life of the equipment is prolonged, and the use experience of a user is improved.
In addition, the control method of the air source heat pump equipment in the above technical solution provided by the present invention may further have the following additional technical features:
in the above technical solution, the pre-defrosting condition specifically includes: within a first preset time, the first temperature is always smaller than a second threshold and a preset third threshold; wherein the second threshold is determined according to a difference between the ambient temperature and a preset constant.
In the technical scheme, if the inlet temperature of the evaporator, specifically the first temperature, is always smaller than the second threshold and the third threshold within a first preset time period, it is determined that the current first temperature meets the pre-defrosting condition. Specifically, the second threshold may be calculated according to the acquired ambient temperature, and the second threshold is specifically a difference between the ambient temperature and a preset constant. The third threshold is a preset value.
The first temperature meets the pre-defrosting condition, namely the first temperature is lower than the second threshold and the third threshold at the same time, which indicates that the possibility of frosting of the current evaporator is high, so that the air source heat pump equipment is controlled to adjust the operation parameters to enable the air source heat pump equipment to enter the pre-defrosting mode.
If the first temperature is higher than any one of the second threshold value and the third threshold value, the evaporator of the air source heat pump device is considered to be less likely to frost at the moment, and the air source heat pump device is controlled to normally operate in the heating mode at the moment so as to ensure the heating effect.
In any of the above technical solutions, the air source heat pump device includes a compressor, a fan, and an expansion valve, and the step of controlling the air source heat pump device to adjust the operation parameters specifically includes: and controlling the operating frequency of the compressor to be reduced to a target operating frequency, controlling the rotating speed of the fan to be increased to a target rotating speed, and controlling the opening degree of the expansion valve to be increased to a target opening degree.
In the technical scheme, when the ambient temperature is greater than a first threshold value and the first temperature meets a pre-defrosting condition, the air source heat pump equipment is controlled to adjust the operation parameters to enter a pre-defrosting mode. Specifically, in the pre-defrosting mode, the operation frequency of a compressor of the air source heat pump device is controlled to be reduced, specifically, the operation frequency is reduced to a target operation frequency, meanwhile, the rotation speed of a fan of the air source heat pump device is controlled to be increased to a target rotation speed, and the opening degree of an expansion valve of the air source heat pump device is controlled to be adjusted to a target opening degree.
Specifically, when the running frequency of the compressor is reduced, the rotating speed of the fan is increased, and the opening degree of the electronic expansion valve is increased, the evaporation pressure of the evaporator is correspondingly increased, the temperature of the evaporator is increased, meanwhile, due to the fact that the rotating speed of the fan is increased, the evaporator is subjected to heat exchange with an external environment more quickly, frost attached to the surface of the evaporator can be effectively melted, and defrosting is achieved on the premise that the four-way valve is not controlled for reversing.
In any of the above technical solutions, the air source heat pump device further includes a four-way valve, and after the step of controlling the air source heat pump device to adjust the operation parameters, the control method further includes: controlling the air source heat pump equipment to continuously operate for a second preset time length according to the current operation parameters, and then obtaining a second temperature of the inlet of the evaporator; determining a temperature change value according to the difference value of the second temperature and the first temperature; controlling the four-way valve to change direction based on the condition that the temperature change value is less than or equal to the change threshold value; and controlling the air source heat pump equipment to continuously operate for a third preset time length according to the current operation parameters based on the condition that the temperature change value is greater than the change threshold value.
According to the technical scheme, after the air source heat pump equipment enters the pre-defrosting mode, the air source heat pump equipment is controlled to continuously operate for a second preset time according to working parameters corresponding to the pre-defrosting mode, the inlet temperature of the evaporator, namely the second temperature, is collected again, and the change value of the inlet temperature of the evaporator in the second preset time can be obtained through calculation according to the interpolation value of the second temperature and the first temperature. If the temperature change value is smaller than or equal to the change threshold value, namely the temperature of the inlet of the evaporator does not change obviously, the pre-defrosting mode is determined not to achieve the expected defrosting effect, the frosting condition of the evaporator is not relieved, and at the moment, the four-way valve is controlled to change direction, so that the air source heat pump equipment enters the four-way valve reversing defrosting mode, and the defrosting effect is ensured.
If the temperature change value is larger than the change threshold value, namely the temperature of the inlet of the evaporator is greatly changed, the defrosting effect is good, the air source heat pump equipment is continuously controlled to continuously keep the operation parameters of the pre-defrosting mode within a third preset time period for defrosting operation, and defrosting is continuously performed on the premise of not greatly influencing the heating operation.
In any of the above technical solutions, after the step of controlling the air source heat pump device to continue to operate for the third preset time period with the current operating parameter, the control method further includes: obtaining a third temperature at the evaporator inlet; controlling the four-way valve to reverse based on the condition that the third temperature is less than or equal to the fourth threshold value; and controlling the air source heat pump equipment to recover to the initial operation parameters based on the condition that the third temperature is continuously greater than the fourth threshold value within the fourth preset time period.
In the technical scheme, after the operation of the pre-defrosting mode is finished, the inlet temperature of the evaporator, namely the third temperature, is collected again. If the third temperature is less than or equal to the fourth threshold value, the evaporator is still in a frosting state, the evaporator is considered to be frosted seriously, the defrosting capacity in the pre-defrosting mode is not enough to completely remove the frosting on the evaporator, at the moment, the four-way valve is controlled to change direction, and the air source heat pump equipment is controlled to enter the four-way valve reversing defrosting mode to ensure the defrosting effect.
And if the third temperature is greater than the fourth threshold value and lasts for at least a fourth preset time, indicating that the frosting of the evaporator is removed and no secondary frosting occurs, and controlling the air source heat pump equipment to recover to the operation of the initial operation parameters before defrosting.
In any of the above technical solutions, the range of the first threshold is: 0 ℃ to 7 ℃.
In this embodiment, the first threshold is in the range of 0 ℃ to 7 ℃. Specifically, when the ambient temperature is greater than 0 ℃, the evaporator can be defrosted by heat exchange with the natural environment in theory. It will be appreciated that the first threshold may be specifically adjusted depending on the operating environment in which the air-source heat pump apparatus is installed, such as different altitude, different climate, different humidity or different air pressure.
A second aspect of the present invention provides a control apparatus for an air-source heat pump device, including: a memory having a computer program stored thereon; the processor is configured to implement the steps of the control method of the air source heat pump apparatus provided in any one of the above technical solutions when executing the computer program, and therefore, the control apparatus of the air source heat pump apparatus further includes all the beneficial effects of the control method of the air source heat pump apparatus provided in any one of the above technical solutions, which are not described herein again.
The third aspect of the present invention provides an air source heat pump device, including the control device of the air source heat pump device provided in any one of the above technical solutions, so that the air source heat pump device further includes all the beneficial effects of the control device of the air source heat pump device provided in any one of the above technical solutions, which are not described herein again.
In the above technical solution, the air-source heat pump apparatus further includes: a compressor; the evaporator is provided with a first temperature sensor at an inlet; the condenser is communicated with the evaporator, the condenser and the compressor to form a refrigerant loop; the four-way valve is arranged on the refrigerant loop and is configured to adjust the refrigerant flow direction of the refrigerant loop; an expansion valve provided in a flow path between the evaporator and the condenser; the fan is arranged towards the evaporator; a second temperature sensor configured to acquire an ambient temperature.
In the technical scheme, the air source heat pump equipment comprises a compressor, an evaporator and a condenser, wherein the compressor, the evaporator and the condenser are sequentially communicated and form a refrigerant loop. The four-way valve is arranged on the refrigerant loop and used for adjusting the flow direction of the refrigerant so as to switch the refrigeration mode and the heating mode. An expansion valve is arranged on a refrigerant loop between the evaporator and the condenser and used for controlling the flow of the refrigerant. The fan sets up towards the evaporimeter for accelerate the heat exchange efficiency between evaporimeter and the air.
Meanwhile, a gas-liquid separator is arranged in front of the air inlet of the compressor and used for separating gaseous refrigerants and liquid refrigerants. The inlet of the evaporator is provided with a first temperature sensor, and the first temperature sensor is used for acquiring a first temperature, a second temperature and a third temperature of the inlet of the evaporator. The air source heat pump device further comprises a second temperature sensor for acquiring the ambient temperature.
A fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when being executed by a processor, implements the steps of the control method for an air source heat pump apparatus provided in any one of the above technical solutions, and therefore, the computer-readable storage medium further includes all the advantages of the control method for an air source heat pump apparatus provided in any one of the above technical solutions, and details thereof are not repeated herein.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows one of the flow charts of a control method of an air source heat pump installation according to an embodiment of the invention;
fig. 2 shows a second flow chart of a control method of an air source heat pump apparatus according to an embodiment of the invention;
fig. 3 shows a third flowchart of a control method of an air source heat pump apparatus according to an embodiment of the invention;
fig. 4 shows a fourth flowchart of a control method of an air source heat pump apparatus according to an embodiment of the invention;
fig. 5 shows a block diagram of a control device of an air source heat pump apparatus according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of an air source heat pump apparatus according to an embodiment of the invention;
fig. 7 shows a fifth flowchart of a control method of an air source heat pump apparatus according to an embodiment of the present invention.
Wherein, the corresponding relationship between the reference numbers and the names of the components in fig. 6 is:
600 air source heat pump equipment, 602 compressor, 604 evaporator, 606 first temperature sensor, 608 condenser, 610 four-way valve, 612 expansion valve, 614 fan, 616 second temperature sensor and 618 gas-liquid separator.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of an air source heat pump apparatus, a control device of an air source heat pump apparatus, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 7.
Example one
Fig. 1 shows one of the flowcharts of the control method of the air source heat pump device according to the embodiment of the present invention, and in the embodiment of the present invention, the control method of the air source heat pump device specifically includes the following steps:
step S102, acquiring an ambient temperature and a first temperature of an evaporator inlet of air source heat pump equipment;
and step S104, when the ambient temperature is greater than a first threshold value and the first temperature meets a pre-defrosting condition, controlling the air source heat pump equipment to adjust the operation parameters.
In step S104, the range of the first threshold is: 0 ℃ to 7 ℃.
In the embodiment of the invention, a 'pre-defrosting mode' is provided, specifically, whether the current evaporator is frosted or not is judged by acquiring the ambient temperature and the inlet temperature of the evaporator, and whether the inlet temperature of the evaporator meets the pre-defrosting condition or not is judged by combining the outdoor ambient temperature. When the pre-defrosting condition is met, the evaporator can be defrosted through the natural environment by controlling the air source heat pump equipment to adjust the operation parameters, such as adjusting the operation frequency of a compressor, adjusting the rotating speed of a fan and adjusting the opening of throttling components such as an electronic expansion valve, so that the problem of poor heating effect caused by reversing of a four-way valve in the traditional defrosting mode is avoided.
Specifically, when the air-source heat pump apparatus operates in the heating mode, moisture in the air may adhere to the surface of the evaporator and form frost due to the low temperature of the evaporator, which may reduce the heat exchange efficiency of the evaporator. Therefore, the air source heat pump device can be controlled to enter a 'pre-defrosting mode', specifically, the running parameters are adjusted to remove the frost attached to the surface of the evaporator.
The first threshold value is a preset environment temperature threshold value, if the outdoor environment temperature is larger than the first threshold value, the outdoor environment temperature is judged to be higher than the frosting temperature, at the moment, the frosting attached to the surface of the evaporator can be effectively removed by enabling the evaporator to perform heat exchange with the outdoor environment, therefore, if the inlet temperature of the evaporator meets the pre-defrosting regulation at the same time, the air source heat pump equipment can be controlled to adjust the operation parameters to defrost so as to remove the frosting attached to the surface of the evaporator, the heat exchange efficiency of the evaporator is improved so as to ensure the heating capacity of the air source heat pump equipment, and meanwhile, the reversing of the four-way valve is avoided.
The first threshold value ranges from 0 ℃ to 7 ℃. Specifically, when the ambient temperature is greater than 0 ℃, the evaporator can be defrosted by heat exchange with the natural environment in theory. It will be appreciated that the first threshold may be specifically adjusted depending on the operating environment in which the air-source heat pump apparatus is installed, such as different altitude, different climate, different humidity or different air pressure.
In some embodiments, the first threshold is 2 ℃.
In other embodiments, the first threshold is 3 ℃.
The air source heat pump device includes an air conditioner of an air source heat pump or a water heater of the air source heat pump, and the specific form of the air source heat pump device is not limited in the embodiment of the invention.
By applying the embodiment of the invention, the air source heat pump equipment can be subjected to pre-defrosting through the external environment by setting the pre-defrosting mode, so that the temperature reduction of air at a user side or the temperature reduction of a water tank at the user side caused by the reversing of the four-way valve when the evaporator is not frosted is effectively avoided, the heating capacity and the energy efficiency attenuation of the heat pump are smaller, the pressure impact on the system caused by the reversing of the four-way valve can be reduced, the running reliability of the system is improved, the service life of the equipment is prolonged, and the use experience of a user is improved.
Example two
Fig. 2 shows a second flowchart of a control method of an air source heat pump device according to an embodiment of the present invention, in which an air source heat pump device includes a compressor, a fan, and an expansion valve, and the control method of the air source heat pump device specifically includes the following steps:
step S202, acquiring an ambient temperature and a first temperature of an evaporator inlet of air source heat pump equipment;
step S204, determining that the ambient temperature is greater than a first threshold value;
step S206, determining that the first temperature is always smaller than a second threshold and a third threshold within a first preset time period;
in step S206, the second threshold is equal to the difference between the ambient temperature and the preset constant, and the third threshold is a preset value.
And S208, controlling the operating frequency of the compressor to be reduced to a target operating frequency, controlling the rotating speed of the fan to be increased to a target rotating speed, and controlling the opening degree of the expansion valve to be increased to a target opening degree.
In the embodiment of the invention, if the evaporator inlet temperature, specifically the first temperature, is always smaller than the second threshold and the third threshold within the first preset time period, it is determined that the current first temperature meets the pre-defrosting condition. Specifically, the second threshold may be calculated according to the acquired ambient temperature, and the second threshold is specifically a difference between the ambient temperature and a preset constant. The third threshold is a preset value.
The first temperature meets the pre-defrosting condition, namely the first temperature is continuously lower than the second threshold and the third threshold within the first preset time, which indicates that the current evaporator is high in frosting possibility, so that the air source heat pump equipment is controlled to adjust the operation parameters to enable the air source heat pump equipment to enter the pre-defrosting mode.
If the first temperature is higher than any one of the second threshold value and the third threshold value, the evaporator of the air source heat pump device is considered to be less likely to frost at the moment, and the air source heat pump device is controlled to normally operate in the heating mode at the moment so as to ensure the heating effect.
Specifically, when the ambient temperature is greater than a first threshold value and the first temperature meets a pre-defrosting condition, the air source heat pump device is controlled to adjust the operation parameters to enter a pre-defrosting mode. In the pre-defrosting mode, the operation frequency of a compressor of the air source heat pump equipment is controlled to be reduced, specifically, the operation frequency is reduced to a target operation frequency, meanwhile, the rotating speed of a fan of the air source heat pump equipment is controlled to be increased to a target rotating speed, and the opening degree of an expansion valve of the air source heat pump equipment is controlled to be adjusted to a target opening degree.
Specifically, when the running frequency of the compressor is reduced, the rotating speed of the fan is increased, and the opening degree of the electronic expansion valve is increased, the evaporation pressure of the evaporator is correspondingly increased, the temperature of the evaporator is increased, meanwhile, due to the fact that the rotating speed of the fan is increased, the evaporator is subjected to heat exchange with an external environment more quickly, frost attached to the surface of the evaporator can be effectively melted, and defrosting is achieved on the premise that the four-way valve is not controlled for reversing.
The preset constant and the third threshold are preset values, specific values of the preset constant and the third threshold are related to hardware parameters of the air source heat pump equipment and a working environment where the air source heat pump equipment is located, and the preset constant and the third threshold can be set according to specific models of the air source heat pump equipment, specific sales regions and sales units of the air source heat pump equipment.
The first preset time is a preset value, specifically a judgment threshold value for judging whether the evaporator is frosted, and the first preset time can be set according to hardware parameters of the evaporator.
EXAMPLE III
Fig. 3 shows a third flowchart of a control method of an air source heat pump device according to an embodiment of the present invention, in the embodiment of the present invention, the air source heat pump device includes a four-way valve, and after the air source heat pump device enters the pre-defrost mode, the control method of the air source heat pump device further includes the following steps:
step S302, after the air source heat pump equipment is controlled to continuously operate for a second preset time length according to the current operation parameters, a second temperature of the inlet of the evaporator is obtained;
step S304, determining a temperature change value according to the difference value between the second temperature and the first temperature;
step S306, controlling the four-way valve to change the direction when the temperature change value is less than or equal to the change threshold value;
and step S308, when the temperature change value is larger than the change threshold value, controlling the air source heat pump equipment to continuously operate for a third preset time length according to the current operation parameters.
In the embodiment of the invention, after the air source heat pump equipment enters the pre-defrosting mode, the air source heat pump equipment is controlled to continuously operate for a second preset time according to the working parameters corresponding to the pre-defrosting mode, the inlet temperature of the evaporator, namely the second temperature, is collected again, and the change value of the inlet temperature of the evaporator in the second preset time can be obtained through calculation according to the interpolation value of the second temperature and the first temperature. If the temperature change value is smaller than or equal to the change threshold value, namely the temperature of the inlet of the evaporator does not change obviously, the pre-defrosting mode is determined not to achieve the expected defrosting effect, the frosting condition of the evaporator is not relieved, and at the moment, the four-way valve is controlled to change direction, so that the air source heat pump equipment enters the four-way valve reversing defrosting mode, and the defrosting effect is ensured.
If the temperature change value is larger than the change threshold value, namely the temperature of the inlet of the evaporator is greatly changed, the defrosting effect is good, the air source heat pump equipment is continuously controlled to continuously keep the operation parameters of the pre-defrosting mode within a third preset time period for defrosting operation, and defrosting is continuously performed on the premise of not greatly influencing the heating operation.
Example four
Fig. 4 shows a fourth flowchart of the control method of the air source heat pump device according to the embodiment of the present invention, after the step of controlling the air source heat pump device to continue to operate for the third preset time period with the current operating parameters, the control method of the air source heat pump device further includes the following steps:
step S402, acquiring a third temperature of an evaporator inlet;
step S404, when the third temperature is less than or equal to a fourth threshold value, controlling the four-way valve to change direction;
and step S406, when the third temperature is continuously greater than the fourth threshold value within a fourth preset time period, controlling the air source heat pump equipment to recover to the initial operation parameters.
In the embodiment of the present invention, after the pre-defrost mode operation is completed, the inlet temperature of the evaporator, i.e., the third temperature, is collected again. If the third temperature is less than or equal to the fourth threshold value, the evaporator is still in a frosting state, the evaporator is considered to be frosted seriously, the defrosting capacity in the pre-defrosting mode is not enough to completely remove the frosting on the evaporator, at the moment, the four-way valve is controlled to change direction, and the air source heat pump equipment is controlled to enter the four-way valve reversing defrosting mode to ensure the defrosting effect.
And if the third temperature is greater than the fourth threshold value and lasts for at least a fourth preset time, indicating that the frosting of the evaporator is removed and no secondary frosting occurs, and controlling the air source heat pump equipment to recover to the operation of the initial operation parameters before defrosting.
EXAMPLE five
Fig. 5 shows a block diagram of a control device of an air source heat pump apparatus according to an embodiment of the present invention, in the embodiment of the present invention, there is provided a control device 500 of an air source heat pump apparatus, including: a memory 502 having a computer program stored thereon; the processor 504 is configured to implement the steps of the control method of the air source heat pump device provided in any one of the above embodiments when executing a computer program, and therefore, the control device 500 of the air source heat pump device further includes all the beneficial effects of the control method of the air source heat pump device provided in any one of the above embodiments.
In particular, the control device of the air-source heat pump installation can carry out the following method steps:
acquiring an ambient temperature and a first temperature of an evaporator inlet of air source heat pump equipment;
step two, determining that the ambient temperature is greater than a first threshold value;
determining that the first temperature is always smaller than a second threshold and a third threshold within a first preset time period;
controlling the running frequency of the compressor to be reduced to a target running frequency, controlling the rotating speed of the fan to be increased to a target rotating speed, and controlling the opening degree of the expansion valve to be increased to a target opening degree;
step five, acquiring a second temperature of the inlet of the evaporator;
step six, determining a temperature change value according to the difference value between the second temperature and the first temperature;
step seven, when the temperature change value is less than or equal to the change threshold value, controlling the four-way valve to change direction;
step eight, when the temperature change value is larger than the change threshold value, controlling the air source heat pump equipment to continuously operate for a third preset time length according to the current operation parameters;
step nine, acquiring a third temperature of an inlet of the evaporator;
step ten, when the third temperature is less than or equal to a fourth threshold value, controlling the four-way valve to change direction;
step eleven, when the third temperature is continuously greater than the fourth threshold value within the fourth preset time period, controlling the air source heat pump equipment to recover to the initial operation parameters.
In the embodiment of the invention, a 'pre-defrosting mode' is provided, specifically, whether the current evaporator is frosted or not is judged by acquiring the ambient temperature and the inlet temperature of the evaporator, and whether the inlet temperature of the evaporator meets the pre-defrosting condition or not is judged by combining the outdoor ambient temperature. When the pre-defrosting condition is met, the evaporator can be defrosted through the natural environment by controlling the air source heat pump equipment to adjust the operation parameters, such as adjusting the operation frequency of a compressor, adjusting the rotating speed of a fan and adjusting the opening of throttling components such as an electronic expansion valve, so that the problem of poor heating effect caused by reversing of a four-way valve in the traditional defrosting mode is avoided.
Specifically, when the air-source heat pump apparatus operates in the heating mode, moisture in the air may adhere to the surface of the evaporator and form frost due to the low temperature of the evaporator, which may reduce the heat exchange efficiency of the evaporator. Therefore, the air source heat pump device can be controlled to enter a 'pre-defrosting mode', specifically, the running parameters are adjusted to remove the frost attached to the surface of the evaporator.
The first threshold value is a preset environment temperature threshold value, if the outdoor environment temperature is larger than the first threshold value, the outdoor environment temperature is judged to be higher than the frosting temperature, at the moment, the frosting attached to the surface of the evaporator can be effectively removed by enabling the evaporator to perform heat exchange with the outdoor environment, therefore, if the inlet temperature of the evaporator meets the pre-defrosting regulation at the same time, the air source heat pump equipment can be controlled to adjust the operation parameters to defrost so as to remove the frosting attached to the surface of the evaporator, the heat exchange efficiency of the evaporator is improved so as to ensure the heating capacity of the air source heat pump equipment, and meanwhile, the reversing of the four-way valve is avoided.
The first temperature meets the pre-defrosting condition, namely the first temperature is continuously lower than the second threshold and the third threshold within the first preset time, which indicates that the current evaporator is high in frosting possibility, so that the air source heat pump equipment is controlled to adjust the operation parameters to enable the air source heat pump equipment to enter the pre-defrosting mode.
If the first temperature is higher than any one of the second threshold value and the third threshold value, the evaporator of the air source heat pump device is considered to be less likely to frost at the moment, and the air source heat pump device is controlled to normally operate in the heating mode at the moment so as to ensure the heating effect.
After the air source heat pump equipment enters the pre-defrosting mode, the air source heat pump equipment is controlled to continuously operate for a second preset time according to working parameters corresponding to the pre-defrosting mode, the inlet temperature of the evaporator, namely the second temperature, is collected again, and the change value of the inlet temperature of the evaporator in the second preset time can be obtained through calculation according to the interpolation value of the second temperature and the first temperature. If the temperature change value is smaller than or equal to the change threshold value, namely the temperature of the inlet of the evaporator does not change obviously, the pre-defrosting mode is determined not to achieve the expected defrosting effect, the frosting condition of the evaporator is not relieved, and at the moment, the four-way valve is controlled to change direction, so that the air source heat pump equipment enters the four-way valve reversing defrosting mode, and the defrosting effect is ensured.
If the temperature change value is larger than the change threshold value, namely the temperature of the inlet of the evaporator is greatly changed, the defrosting effect is good, the air source heat pump equipment is continuously controlled to continuously keep the operation parameters of the pre-defrosting mode within a third preset time period for defrosting operation, and defrosting is continuously performed on the premise of not greatly influencing the heating operation.
By applying the embodiment of the invention, the air source heat pump equipment can pre-defrost the evaporator through the heat of the external environment under the condition of no shutdown by setting the pre-defrosting mode, thereby effectively avoiding the temperature reduction of air at a user side or the temperature reduction of a water tank at the user side caused by the reversing of the four-way valve when the evaporator is frosted less, reducing the heating capacity and energy efficiency attenuation of the heat pump, reducing the pressure impact on the system caused by the reversing of the four-way valve, further improving the running reliability of the system, prolonging the service life of the equipment and improving the use experience of users.
EXAMPLE six
Fig. 6 shows a schematic structural diagram of an air-source heat pump apparatus according to an embodiment of the present invention, in which an air-source heat pump apparatus 600 includes a control device 500 of the air-source heat pump apparatus provided in any one of the above embodiments; a compressor 602; an evaporator 604, wherein a first temperature sensor 606 is arranged at the inlet of the evaporator 604; the condenser 608, the evaporator 604, the condenser 608 and the compressor 602 are communicated to form a refrigerant loop; a four-way valve 610 disposed on the refrigerant circuit and configured to adjust a refrigerant flow direction of the refrigerant circuit; an expansion valve 612 provided in a flow path between the evaporator 604 and the condenser 608; fan 614, fan 614 disposed toward evaporator 604; a second temperature sensor 616 configured to acquire an ambient temperature.
In the embodiment of the present invention, the air source heat pump device 600 includes an air conditioner of an air source heat pump or a water heater of an air source heat pump, and the specific form of the air source heat pump device is not limited in the embodiment of the present invention. The air source heat pump device 600 includes a compressor 602, an evaporator 604, and a condenser 608, and the compressor 602, the evaporator 604, and the condenser 608 are sequentially communicated and form a refrigerant circuit. The four-way valve 610 is disposed on the refrigerant circuit for adjusting the flow direction of the refrigerant to switch the cooling mode and the heating mode. An expansion valve 612 is disposed in a refrigerant circuit between the evaporator 604 and the condenser 608, and the expansion valve 612 is configured to control a refrigerant flow rate. The fan 614 is disposed toward the evaporator 604 for accelerating the heat exchange efficiency between the evaporator 604 and the air.
Meanwhile, a gas-liquid separator 618 is disposed in front of the air inlet of the compressor for separating the gaseous refrigerant and the liquid refrigerant. A first temperature sensor 606 is disposed at an inlet of the evaporator 604, and the first temperature sensor 606 is used for acquiring a first temperature, a second temperature and a third temperature of the inlet of the evaporator 604. The air source heat pump device 600 further comprises a second temperature sensor 616, the second temperature sensor 616 being used to obtain the ambient temperature.
EXAMPLE seven
In the embodiment of the present invention, a complete implementation of the embodiment of the present invention is described by taking a schematic structural diagram of an air source heat pump apparatus according to the embodiment of the present invention shown in fig. 6 as an example.
Specifically, the air source heat pump device is provided with a finned tube heat exchanger inlet tray temperature sensor (namely, the first temperature sensor 606) and an ambient temperature sensor (namely, the second temperature sensor 616), and as shown in fig. 6, after the device is powered on, the detected temperature is fed back to the control device 500 of the air source heat pump device in real time.
When the ambient temperature T4 is detected to be higher than 2 ℃, after the compressor is started to operate for a certain time TIMs0, if the evaporator inlet temperature T3 is detected to be lower than 0 ℃, T3 is detected to be lower than T4- Δ Ts, and the time TIMs1 continues, the pre-defrosting mode operation is started, specifically, the compressor operation frequency Fx is reduced to the preset frequency Fs, the fan rotation speed Nx is increased to the preset rotation speed Ns, and meanwhile, the electronic expansion valve opening PLSx is increased to the preset opening PLSs.
Wherein T4 is the ambient temperature, T3 is the evaporator inlet temperature, and Δ Ts, TIMs0, TIMs1, Fs, Ns, and PLSs are preset values.
After entering the pre-defrost mode, the system remains in this state for the run time TIMs2, and the following decisions are made:
1) if delta T3 is not more than delta T3s in the running time TIMS2, controlling the four-way valve to change direction and entering a four-way valve defrosting mode;
2) if delta T3 is larger than delta T3s in the operation time TIMS2, the operation in the state is continuously kept until T3 is larger than T3s and the time TIMs3 are detected, the pre-defrosting mode is exited, the operation frequency Fx of the compressor is recovered to the target frequency, the rotation speed Nx of the fan is recovered to the normal control, the opening PLSx of the electronic expansion valve is firstly switched to the initial opening and then is recovered to the normal control;
3) and if the time T3 is not more than T3s after the defrosting mode is started and the running time TIMs4 continues, the four-way valve reversing defrosting mode is started.
Wherein, the delta T3 is the variation of the evaporator inlet temperature T3 in the running time TIMs2, and the TIMs2, the delta T3s, the T3s, the TIMs3 and the TIMs4 are all preset values.
Fig. 7 shows a fifth flowchart of a control method of an air source heat pump device according to an embodiment of the present invention, which specifically includes the following steps:
step S702, electrifying the air source heat pump equipment;
step S704, detecting the plate feeding temperature T3 and the environment temperature T4 of the finned tube heat exchanger in real time;
step S706, determining that the running time of the compressor reaches TIMs 0;
step S708, judging that T4 is more than 2 ℃; if yes, go to step S710, otherwise go to step S709;
step S709, defrosting judgment is carried out according to a four-way valve reversing mode;
step S710, judging that T3 is less than 0 and T3 is less than T4-delta Ts in the TIMs 1; if yes, the process proceeds to step S712, otherwise, the process proceeds to step S724.
Step S712, enter a pre-defrost mode;
in step S712, the compressor operation frequency Fx is decreased to the preset frequency Fs, the fan rotation speed Nx is increased to the preset rotation speed Ns, and the electronic expansion valve opening PLSx is increased to the preset opening PLSs.
Step S714, judging that delta T3 is more than delta T3S in the TIMs 2; if yes, go to step S716, otherwise go to step S720;
step S716, keeping the pre-defrosting mode to operate;
step S718, judging that T3 is more than T3S in the TIMs 3; if yes, go to step S722, otherwise go to step S719;
step S719, after determining that the TIMs4 are operated in the pre-defrosting mode, the T3 is not more than T3S;
s720, reversing and defrosting the four-way valve;
step S722, exiting the pre-defrost mode;
and step S724, normally operating the air source heat pump equipment.
Example eight
In an embodiment of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the control method for an air source heat pump device provided in any one of the above embodiments, and therefore, the computer-readable storage medium further includes all the beneficial effects of the control method for an air source heat pump device provided in any one of the above embodiments, and details are not described here.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," 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 present invention. In the present invention, 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.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A control method of an air-source heat pump apparatus, characterized by comprising:
acquiring an ambient temperature and a first temperature of an evaporator inlet of the air-source heat pump device;
controlling the air source heat pump equipment to adjust operation parameters on the basis that the environment temperature is greater than a first threshold value and the first temperature meets a pre-defrosting condition;
the air source heat pump device further comprises a four-way valve, and after the step of controlling the air source heat pump device to adjust the operation parameters, the control method further comprises the following steps:
controlling the air source heat pump equipment to continuously operate for a second preset time length according to the current operation parameters, and then obtaining a second temperature of the evaporator inlet;
determining a temperature change value according to the difference value of the second temperature and the first temperature;
controlling the four-way valve to change direction based on the condition that the temperature change value is less than or equal to a change threshold value;
and controlling the air source heat pump equipment to continuously operate for a third preset time period according to the current operation parameters on the basis of the condition that the temperature change value is greater than the change threshold value.
2. The control method of an air-source heat pump apparatus according to claim 1, wherein the pre-defrost condition specifically includes:
within a first preset time, the first temperature is always smaller than a second threshold and a preset third threshold;
and determining the second threshold value according to the difference between the environment temperature and a preset constant.
3. The method according to claim 1, wherein the air source heat pump device comprises a compressor, a fan and an expansion valve, and the step of controlling the air source heat pump device to adjust the operating parameters specifically comprises:
and controlling the operating frequency of the compressor to be reduced to a target operating frequency, controlling the rotating speed of the fan to be increased to a target rotating speed, and controlling the opening degree of the expansion valve to be increased to a target opening degree.
4. The control method of an air-source heat pump unit as claimed in claim 1, wherein after the step of controlling the air-source heat pump unit to continue operating at the current operating parameter for a third preset period of time, the control method further comprises:
obtaining a third temperature at the evaporator inlet;
controlling the four-way valve to reverse based on the condition that the third temperature is less than or equal to a fourth threshold value;
and controlling the air source heat pump equipment to recover to the initial operation parameters based on the condition that the third temperature is continuously greater than the fourth threshold value within a fourth preset time period.
5. The control method of an air-source heat pump apparatus according to any one of claims 1 to 3, wherein the first threshold value ranges from: 0 ℃ to 7 ℃.
6. A control apparatus of an air-source heat pump apparatus, comprising:
a memory having a computer program stored thereon;
a processor configured to implement the control method of an air source heat pump apparatus as claimed in any one of claims 1 to 5 when executing the computer program.
7. An air-source heat pump apparatus, comprising:
the control device of the air-source heat pump apparatus as claimed in claim 6.
8. The air-source heat pump apparatus of claim 7, further comprising:
a compressor;
the evaporator is provided with a first temperature sensor at an inlet;
the evaporator, the condenser and the compressor are communicated to form a refrigerant loop;
the four-way valve is arranged on the refrigerant loop and is configured to adjust the refrigerant flow direction of the refrigerant loop;
an expansion valve provided in a flow path between the evaporator and the condenser;
a fan disposed toward the evaporator;
a second temperature sensor configured to acquire an ambient temperature.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of controlling an air-source heat pump apparatus according to any one of claims 1 to 5.
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| CN113847741B (en) * | 2021-08-30 | 2023-07-18 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
| CN114234486B (en) * | 2021-12-20 | 2023-03-31 | 广东芬尼克兹节能设备有限公司 | Heat pump defrosting control method and device, computer equipment and storage medium |
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| CN1142595A (en) * | 1994-11-29 | 1997-02-12 | 三洋电机株式会社 | Air conditioner |
| CN110617603A (en) * | 2019-09-27 | 2019-12-27 | 广东美的暖通设备有限公司 | Air conditioner, control method of air conditioner, and computer-readable storage medium |
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| JP5144728B2 (en) * | 2010-09-09 | 2013-02-13 | パナソニック株式会社 | Air conditioner |
| CN103175353B (en) * | 2011-12-23 | 2015-08-19 | 同方人工环境有限公司 | A kind of defrosting control method being applicable to air source hot pump water heater |
| RU2672995C1 (en) * | 2014-11-24 | 2018-11-21 | Кэрриер Корпорейшн | System and method of autonomous and uninterrupted defrosting |
| CN108072214A (en) * | 2017-10-30 | 2018-05-25 | 青岛海尔空调器有限总公司 | Air-conditioning device and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1142595A (en) * | 1994-11-29 | 1997-02-12 | 三洋电机株式会社 | Air conditioner |
| CN110617603A (en) * | 2019-09-27 | 2019-12-27 | 广东美的暖通设备有限公司 | Air conditioner, control method of air conditioner, and computer-readable storage medium |
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