CN114061024A - Control method and control device for defrosting of air conditioning system, controller and air conditioning system - Google Patents
Control method and control device for defrosting of air conditioning system, controller and air conditioning system Download PDFInfo
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- CN114061024A CN114061024A CN202010748740.9A CN202010748740A CN114061024A CN 114061024 A CN114061024 A CN 114061024A CN 202010748740 A CN202010748740 A CN 202010748740A CN 114061024 A CN114061024 A CN 114061024A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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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
- F24F2110/10—Temperature
Abstract
The invention provides a defrosting control method and device for an air conditioning system, a controller and the air conditioning system, wherein the air conditioning system comprises a refrigerant loop formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, and also comprises a water heat exchange system for exchanging heat with the second heat exchanger, and the control method comprises the following steps: acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of a second heat exchanger of the air conditioning system; calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system; and controlling a first heat exchanger of the air conditioning system to enter a defrosting mode according to the fact that the current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside the threshold range of the preset ratio. According to the invention, the defrosting operation of the first heat exchanger is controlled according to the current ratio of the current heat exchange energy between the second heat exchanger and the water heat exchange system and the current running frequency of the compressor, so that the early or late defrosting operation of the air conditioning system is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device for an air conditioning system, a controller and the air conditioning system.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
With the increasing standard of living, people's expectations for air conditioners are no longer limited to the regulation of indoor temperature, but also concern the comfort of the regulation process. The defrosting program of the air conditioner in the heating mode has a great influence on the comfort of the air conditioner, and if the defrosting program is improperly controlled, frequent defrosting or no defrosting of an air conditioning system can be caused, so that the use experience of a user is influenced. With the advance of changing national coal into electricity, the accurate control of the defrosting program in the heating mode is more important.
At present, the defrosting of the air conditioning system is mainly controlled according to the temperature of an outdoor heat exchanger, and the control mode can better control the frosting and defrosting of the air conditioning system by setting proper defrosting inlet temperature and defrosting outlet temperature. The defrosting mode needs to be distinguished according to different environment humidity conditions, defrosting entering methods under different environment humidity conditions are different, the different environment humidity conditions correspond to a larger control interval, and defrosting entering conditions of the control interval are not necessarily suitable for all conditions of the control interval, so that defrosting of the air conditioning system is not intelligent enough.
Disclosure of Invention
The invention aims to solve the technical problem that the existing air conditioning system is unreasonable in defrosting operation.
In order to achieve the above object, a first aspect of the present invention provides a defrosting control method for an air conditioning system, where the air conditioning system includes a refrigerant loop formed by sequentially connecting a compressor, a first heat exchanger, a throttling device, and a second heat exchanger, and the air conditioning system further includes a water heat exchange system for exchanging heat with the second heat exchanger, and the control method includes: acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of a second heat exchanger of the air conditioning system; calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system; and controlling a first heat exchanger of the air conditioning system to enter a defrosting mode according to the fact that the current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside the threshold range of the preset ratio.
According to the invention, whether the defrosting operation is carried out on the first heat exchanger is determined according to the ratio of the current heat exchange energy between the second heat exchanger and the water heat exchange system and the current running frequency of the compressor, so that the phenomenon that the defrosting operation is carried out on the first heat exchanger in advance or late in the air conditioning system is reduced.
In addition, the method for controlling defrosting of the air conditioning system according to the present invention may further have the following additional technical features:
according to an embodiment of the present invention, controlling the first heat exchanger of the air conditioning system to enter the defrosting mode according to that a current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside a threshold range of a preset ratio comprises: and controlling the first heat exchanger to enter a defrosting mode according to the condition that the current ratio is smaller than the product of the preset ratio and the preset coefficient, wherein the preset coefficient is smaller than 1.
According to one embodiment of the present invention, a control method includes: and determining that the current ratio replaces the preset ratio according to the fact that the current ratio is larger than the preset ratio.
According to one embodiment of the invention, the water heat exchange system comprises a water pump, and calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system comprises: and determining the current heat exchange energy by the product of the current temperature difference of the inlet and outlet water and the set water flow of the water heat exchange system according to the condition that the water pump is a constant-speed water pump.
According to one embodiment of the invention, the water heat exchange system comprises a water pump, and calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system comprises: and determining the current heat exchange energy by the product of the current temperature difference of the inlet and outlet water and the current water flow of the water heat exchange system according to the fact that the water pump is a variable-frequency water pump.
The second aspect of the present invention further provides a defrosting control device for an air conditioning system, the air conditioning system includes a refrigerant loop formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, the air conditioning system further includes a water heat exchange system for exchanging heat with the second heat exchanger, the control device is configured to execute the defrosting control method for the air conditioning system of the first aspect of the present invention, and the control device includes: the acquisition module is used for acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of a second heat exchanger of the air conditioning system; the calculation module is used for calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system; and the control module is used for controlling a first heat exchanger of the air conditioning system to enter a defrosting mode according to the fact that the current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside the threshold range of the preset ratio.
According to an embodiment of the invention, the control module is further configured to control the first heat exchanger to enter a defrosting mode according to the current ratio being smaller than a product of a preset ratio and a preset coefficient,
the predetermined coefficient is less than 1.
According to an embodiment of the present invention, the control apparatus further includes a determining module, configured to determine that the current ratio replaces the preset ratio according to the current ratio being greater than the preset ratio.
According to an embodiment of the invention, the determining module is further configured to determine the current heat exchange energy by a product of the current temperature difference between the inlet and outlet water and the set water flow of the water heat exchange system, according to the fact that the water pump is a constant-speed water pump.
According to an embodiment of the invention, the determining module is further configured to determine the current heat exchange energy by a product of the current temperature difference between the water inlet and the water outlet and the current water flow of the water heat exchange system, according to the fact that the water pump is a variable frequency water pump.
The third aspect of the present invention also provides a controller, which comprises a computer readable storage medium and the control device for defrosting the air conditioning system according to the second aspect of the present invention, wherein the computer readable storage medium stores instructions, and when the control device for defrosting the air conditioning system executes the instructions, the control method for defrosting the air conditioning system according to the first aspect of the present invention is implemented.
The fourth aspect of the invention also provides an air conditioning system, which comprises a refrigerant loop, a water heat exchange system and a controller, wherein the refrigerant loop is formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, and an environment temperature sensor is also arranged at the refrigerant loop; the water heat exchange system comprises a water heat exchanger, a tail end heat exchanger and a water pump, wherein the water heat exchanger is in thermal contact with a second heat exchanger and is connected with the tail end heat exchanger, the second heat exchanger exchanges heat with the tail end heat exchanger through the water heat exchanger, a water inlet temperature sensor and a flowmeter are arranged at a water inlet of the water heat exchanger, a water outlet temperature sensor is arranged at a water outlet of the water heat exchanger, and the water pump is arranged in a pipeline of the water heat exchange system; and the controller is electrically connected with the compressor, the inlet water temperature sensor, the outlet water temperature sensor, the environment temperature sensor and the flowmeter, and the controller is the controller according to the third aspect of the invention.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a controller according to an embodiment of the present invention;
FIG. 3 is a flow chart of a defrosting control method for an air conditioning system according to an embodiment of the present invention;
FIG. 4 is a flow chart of a defrosting control method for an air conditioning system according to another embodiment of the present invention;
fig. 5 is a block diagram of a defrosting control device of an air conditioning system according to an embodiment of the present invention.
Wherein the reference numbers are as follows:
100. an air conditioning system; 101. a four-way valve; 102. a refrigerant pipe;
10. a compressor;
20. a controller; 210. a computer-readable storage medium; 220. a control device;
30. a first heat exchanger;
40. a throttling device;
50. a second heat exchanger;
60. a water heat exchanger; 61. an inlet water temperature sensor; 62. an effluent temperature sensor;
70. a terminal heat exchanger;
500. a control device; 510. an acquisition module; 520. a calculation module; 530. a control module; 540. and determining a module.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the defrosting control method of the air conditioning system of the present invention is not only limited to be applied to a central air conditioner, but also applicable to other types of multi-split air conditioning systems, and such adjustment belongs to the protection scope of the defrosting control method of the air conditioning system of the present invention.
As shown in fig. 1 and fig. 2, in order to clearly describe the defrosting control method, the control device 500, the controller 20 and the air conditioning system 100 of the present invention, firstly, the air conditioning system 100 provided by the fourth aspect of the present invention is explained in detail, according to the embodiment of the fourth aspect of the present invention, the air conditioning system 100 includes an outdoor unit, an indoor unit and the controller 20, the outdoor unit includes a refrigerant loop and a water heat exchanger 60, the refrigerant loop is formed by sequentially connecting a compressor 10, a first heat exchanger 50, a throttling device and a second heat exchanger 50, the water heat exchanger 60 is in thermal contact with the second heat exchanger 50, the indoor unit includes a terminal heat exchanger 70, the water heat exchanger 60 is in thermal contact with the second heat exchanger 50 and is connected with the terminal heat exchanger 70, the second heat exchanger 50 exchanges heat with the terminal heat exchanger 70 through the water heat exchanger 60, the water heat exchanger 60 and the terminal heat exchanger 70 constitute a water heat exchange system, a water pump is further arranged in the pipeline of the water heat exchange system, the controller 20 is electrically connected with the compressor 10, and the controller 20 is the controller 20 according to the third aspect of the invention.
In this embodiment, the air conditioning system 100 may be a multi-split system such as a central air conditioner, the multi-split system includes an outdoor unit and one or more indoor units connected in parallel to the water heat exchanger 60 of the outdoor unit, the outdoor unit and the indoor units exchange heat through the second heat exchanger 50 and the water heat exchanger 60 to achieve the purpose of cooling or heating the indoor, and the air conditioning system 100 further includes a four-way valve 101 disposed at an outlet of the compressor 10 and a refrigerant pipe 102 communicating with each component in the air conditioning system 100.
Furthermore, an environment temperature sensor is also arranged at the refrigerant loop, a water inlet temperature sensor 61 and a flowmeter are arranged at a water inlet of the water heat exchanger 60, a water outlet temperature sensor 62 is arranged at a water outlet of the water heat exchanger 60, the controller 20 is electrically connected with the compressor 10, the water inlet temperature sensor 61, the water outlet temperature sensor 62, the environment temperature sensor and the flowmeter, the controller 20 is used for receiving the environment temperature monitored by the environment temperature sensor, the water inlet temperature monitored by the water inlet temperature sensor 61 and the water outlet temperature monitored by the water outlet temperature sensor 62, and calculating the current water inlet and outlet temperature difference of the water heat exchange system according to the water inlet temperature and the water outlet temperature, then the current heat exchange energy of the water heat exchanger 60 is calculated according to the current temperature difference of the inlet and outlet water and the water flow of the water heat exchange system detected by the flowmeter, and determines whether the air conditioning system 100 enters the defrosting mode according to the current ratio of the current heat exchange energy to the current operating frequency of the compressor 10. Specifically, the controller 20 of the present embodiment includes a computer-readable storage medium 210 and a control device 220, where the computer-readable storage medium 210 stores instructions, and the control device 220 executes the instructions to implement the control method of the air conditioning system 100.
The instructions stored in the computer-readable storage medium 210 are described in detail below by a control method of the air conditioning system 100 according to the first aspect of the present invention.
As shown in fig. 1, 2 and 3, according to an embodiment of a first aspect of the present invention, the first aspect of the present invention provides a control method of an air conditioning system 100, the control method including: s310, acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of the second heat exchanger 50 of the air conditioning system 100;
s320, calculating the current heat exchange energy of the water heat exchanger 60 according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system; and S330, controlling the first heat exchanger 50 of the air conditioning system 100 to enter a defrosting mode according to the fact that the ratio of the current heat exchange energy to the current operating frequency of the compressor 10 is out of the threshold range of the preset ratio.
In the embodiment, whether the defrosting operation is performed on the first heat exchanger 50 is determined according to the current ratio of the current heat exchange energy between the second heat exchanger 50 and the water heat exchange system to the current operating frequency of the compressor 10, so that the phenomenon that the defrosting operation is performed on the first heat exchanger 50 in advance or late in the air conditioning system 100 is reduced. Specifically, from the root cause of defrosting, because frosting of the outdoor first heat exchanger 50 affects the heating effect of the air conditioning system 100 on the second heat exchanger 50, and the first heat exchanger 50 needs to be defrosted to recover the heating effect of the second heat exchanger 50, therefore, the defrosting degree of the first heat exchanger 50 can be determined by the attenuation degree of the heating capacity of the air conditioning system 100 on the second heat exchanger 50, and the heating capacity of the air conditioning system 100 directly affects the heat exchange energy of the second heat exchanger 50 and the water heat exchange system, and therefore, whether the air conditioning system 100 enters the defrosting procedure can be controlled according to the attenuation degree of the heat exchange energy of the second heat exchanger 50 and the water heat exchange system.
Further, the control method of this embodiment is to control the air conditioning system 100 to perform a defrosting operation according to a current ratio of the current heat exchange energy of the water heat exchange system to the current operating frequency of the compressor 10, and the current operating frequency of the compressor 10 is added to mainly eliminate an influence of the current operating frequency of the compressor 10 on the current heat exchange energy, that is, the current ratio of the current heat exchange energy to the current operating frequency is equivalent to one equivalent of the heat exchange energy at the unit operating frequency, and when the ratio of the current heat exchange energy to the current operating frequency is attenuated to be outside a threshold range of a preset ratio, the air conditioning system 100 is controlled to perform a defrosting procedure. Since the heat exchange energy reflects the heating capacity of the second heat exchanger 50, the control method of this embodiment is equivalent to controlling the defrosting operation of the air conditioning system 100 according to the attenuation degree of the heating effect of the air conditioning system 100, and if the current ratio of the current heat exchange energy to the current operating frequency is not attenuated or is attenuated by a small amount, it indicates that the heating effect of the air conditioning system 100 is not attenuated or is attenuated by a small amount, at this time, the second heat exchanger 50 of the air conditioning system 100 is continuously in a heat release state, and the defrosting procedure is not executed. On the other hand, if the air conditioning system 100 is severely frosted, the heating effect of the air conditioning system 100 is inevitably attenuated, and the ratio of the current heat exchange energy to the current operating frequency is also inevitably attenuated, so that the control method of the embodiment can accurately control the time when the air conditioning system 100 enters the defrosting program by setting the threshold range of the preset ratio. As can be seen from the above, the control method for defrosting the air conditioning system 100 according to the embodiment is determined according to the heat exchange effect or the heating effect of the air conditioning system 100, and is closer to the actual use condition of the air conditioning system 100, so that the control method according to the embodiment can more accurately and intelligently control the air conditioning system 100 to perform the defrosting operation.
With continuing reference to fig. 1, 2, and 3, step S330 includes, in accordance with one embodiment of the present invention: and controlling the first heat exchanger 50 to enter a defrosting mode according to the fact that the current ratio is smaller than the product of the preset ratio and the preset coefficient, determining the preset ratio according to the maximum value of the current ratio, wherein the preset coefficient is smaller than 1, the preset ratio and the preset coefficient are determined according to the ambient temperature of the air conditioning system detected by the ambient temperature sensor and the water inlet temperature of the water heat exchanger 60, and specific numerical values are not elaborated in detail herein.
Specifically, the operation mode of the air conditioning system 100 is detected after the compressor 10 of the air conditioning system 100 is started, and if the second heat exchanger 50 is in a non-heat release state, the defrosting determination is not performed on the first heat exchanger 50. If the second heat exchanger 50 is in a heat release state, the method for controlling the air conditioning system 100 according to the embodiment of the present invention is performed by first calculating the temperature difference Δ T between the inlet and outlet water of the water heat exchange system as Twout-Twin and the operating frequency F of the compressor 10 (if the compressor is a fixed speed compressor, the frequency of the compressor does not need to be detected), if the water heat exchange system uses an inverter water pump, the current water flow Q of the water heat exchange system needs to be detected, writing the maximum value of the current ratio into the parameter Deta _ Tmax ═ T/F (if the air conditioning system 100 using the inverter water pump needs to multiply the current water flow Q, Cax ═ Q _ Deta _ Tmax/F), that is, if the current ratio (Twout-Twin)/F or (Q × (Twout-Twin)/F calculated at a certain time is greater than the Deta _ Tmax or Cax, writing the current ratio (Twout-Twin)/F or (Q ×)/F or (Twout)/F calculated at the certain time into the Deta _ Tmax or Cax, covering the original Deta _ Tmax or Cax. The air conditioning system 100 controls the second heat exchanger 50 to keep the detection of the temperature difference Δ T of the water inlet and outlet of the water heat exchange system in the heat release state, and if the current ratio (twot)/F or (Q × (twot)/F) calculated at a certain time is smaller than Deta _ T × Deta _ Tmax or Deta _ T _ Cax, the air conditioning system 100 controls the four-way valve 101 to reverse, and the air conditioning system 100 enters the defrosting mode for the first heat exchanger 50. Where the Deta _ T is a preset coefficient less than 1 set by the air conditioning system 100.
According to an embodiment of the present invention, step S320 includes: determining the current heat exchange energy by the product of the current temperature difference of the inlet and outlet water and the set water flow of the water heat exchange system according to the condition that the water pump is a constant-speed water pump; and determining the current heat exchange energy by the product of the current temperature difference of the inlet and outlet water and the current water flow of the water heat exchange system according to the fact that the water pump is a variable-frequency water pump.
In this embodiment, the current heat exchange energy C ═ Cp × Q × Δ T ═ Cp × Q × Twout-Twin |, where Cp is the specific heat capacity of water, the change of Cp in the operable water temperature range of the water heat exchange system is small and can be considered as a constant value, Q is the water flow rate of the water heat exchange system, Twout and Twin are the outlet water temperature and the inlet water temperature of the water heat exchange system, respectively, for the air conditioning system 100 using the variable frequency water pump, the current water flow rate of the water heat exchange system can be detected, and for the air conditioning system 100 using the fixed speed water pump, the water flow rate of the water heat exchange system can be considered as a set water flow rate, and therefore, the current heat exchange energy of the water heat exchange system can be characterized by the following parameters:
the air conditioning system 100 using the constant speed water pump may be characterized as | Twout-Twin |; the air conditioning system 100 using the variable frequency water pump may be characterized as Q | Twout-Twin |.
Therefore, the attenuation of the heating capacity of the air conditioning system 100 can be represented by the attenuation of the above parameters, so that the air conditioning system 100 is controlled to accurately enter the defrosting mode.
In order to fully and specifically describe the control method of the air conditioning system 100 according to the first aspect of the present invention, the following steps are described in fig. 4, and the air conditioning system 100 shown in fig. 1 is referred to:
as shown in fig. 4, the water heat exchange system uses an inverter water pump, and the control method of the air conditioning system 100 includes the following steps:
the operation mode of the second heat exchanger 50 is determined after the air conditioning system 100 is started, if the second heat exchanger 50 is not in a heat release state, the condition that the first heat exchanger 30 enters the defrosting mode is not determined, otherwise, the inflow water temperature and the outflow water temperature of the water heat exchange system and the current operation frequency of the compressor 10 are detected, and the current ratio Cax is calculated.
Assuming that the maximum value Cmax of the current ratio calculated after the second heat exchanger 50 of a certain air conditioning system 100 operates for a certain period of time under the heating condition is 0.065, when the air conditioning system 100 continues to operate until a certain time, Twout is 38.5, Twin is 35.2, Q is 1, and F is 60, Q (Twout-Twin)/F (38.5-35.4)/60 is 0.0516, the attenuation coefficient added under the operating condition is that Deta _ T is 0.8, 0.0516<0.065 × 0.8 is 0.52, and the air conditioning system 100 controls the first heat exchanger 50 to enter the defrosting mode.
As shown in fig. 5, the second aspect of the present invention further provides a control device 500 of the air conditioning system 100 corresponding to the first aspect of the present invention, the control device 500 is used for executing the control method of defrosting of the air conditioning system 100 of the first aspect of the present invention, and the control device 500 includes: an obtaining module 510, configured to obtain a current water inlet and outlet temperature difference of the water heat exchange system according to that the second heat exchanger 50 of the air conditioning system 100 is in a heat release state; a calculating module 520, configured to calculate a current heat exchange energy of the water heat exchanger 60 according to the current water inlet/outlet temperature difference and the water flow of the water heat exchange system; the control module 530 is configured to control the first heat exchanger 30 of the air conditioning system to enter a defrosting mode according to that a current ratio of the current heat exchange energy to the current operating frequency of the compressor 10 is outside a threshold range of a preset ratio.
According to an embodiment of the present invention, the control module 530 is further configured to control the first heat exchanger 30 to enter the defrosting mode according to that the current ratio is smaller than a product of a preset ratio and a preset coefficient, where the preset coefficient is smaller than 1.
According to an embodiment of the present invention, the control apparatus 500 further includes a determining module 540, configured to determine that the current ratio replaces the preset ratio according to the fact that the current ratio is greater than the preset ratio.
According to an embodiment of the present invention, the determining module 540 is further configured to determine the current heat exchange energy according to the current temperature difference between the inlet and the outlet water and the set water flow of the water heat exchange system, where the water pump is a constant-speed water pump.
According to an embodiment of the present invention, the determining module 540 is further configured to determine the current heat exchange energy according to the current temperature difference between the water inlet and the water outlet and the current water flow of the water heat exchange system, where the water pump is a variable frequency water pump.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will appreciate that all or part of the steps in the method according to the above embodiments may be implemented by a program stored in a computer-readable storage medium 210210, the program including instructions for causing a computer (which may be a single chip, a chip, or the like) or a control device 500 (such as a processor) to perform all or part of the steps in the method according to the embodiments of the present application. And the aforementioned computer-readable storage medium 210 includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. The defrosting control method of the air conditioning system is characterized in that the air conditioning system comprises a refrigerant loop formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, the air conditioning system further comprises a water heat exchange system for exchanging heat with the second heat exchanger, and the control method comprises the following steps:
acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of the second heat exchanger of the air conditioning system;
calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system;
and controlling the first heat exchanger of the air conditioning system to enter a defrosting mode according to the fact that the current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside the threshold range of the preset ratio.
2. The method for controlling defrosting of an air conditioning system according to claim 1, wherein the controlling the first heat exchanger of the air conditioning system to enter the defrosting mode according to the current ratio of the current heat exchange energy to the current operating frequency of the compressor being outside a threshold range of a preset ratio comprises:
controlling the first heat exchanger to enter a defrosting mode according to the condition that the current ratio is smaller than the product of the preset ratio and the preset coefficient,
the preset coefficient is less than 1.
3. The control method for defrosting an air conditioning system according to claim 1, comprising:
and determining that the current ratio replaces the preset ratio according to the condition that the current ratio is greater than the preset ratio.
4. The method for controlling defrosting of an air conditioning system according to claim 1, wherein the water heat exchange system comprises a water pump, and the calculating of the current temperature difference between the water inlet and the water outlet and the current heat exchange energy of the water heat exchanger according to the water flow of the water heat exchange system comprises:
and determining the current heat exchange energy by the product of the current water inlet and outlet temperature difference and the set water flow of the water heat exchange system according to the condition that the water pump is a constant-speed water pump.
5. The method for controlling defrosting of an air conditioning system according to claim 1, wherein the water heat exchange system comprises a water pump, and the calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system comprises:
and determining the current heat exchange energy by the product of the current temperature difference of the water inlet and the water outlet and the current water flow of the water heat exchange system according to the fact that the water pump is a variable-frequency water pump.
6. A defrosting control device of an air conditioning system is characterized in that the air conditioning system comprises a refrigerant loop formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, the air conditioning system further comprises a water heat exchange system for exchanging heat with the second heat exchanger, the control device is used for executing the defrosting control method of the air conditioning system according to any one of claims 1 to 5, and the control device comprises:
the acquisition module is used for acquiring the current water inlet and outlet temperature difference of the water heat exchange system according to the heat release state of the second heat exchanger of the air conditioning system;
the calculation module is used for calculating the current heat exchange energy of the water heat exchanger according to the current water inlet and outlet temperature difference and the water flow of the water heat exchange system;
and the control module is used for controlling the first heat exchanger of the air conditioning system to enter a defrosting mode according to the fact that the current ratio of the current heat exchange energy to the current operating frequency of the compressor is outside the threshold range of a preset ratio.
7. The control apparatus for defrosting an air conditioning system according to claim 6,
the control module is also used for controlling the first heat exchanger to enter a defrosting mode according to the condition that the current ratio is smaller than the product of the preset ratio and the preset coefficient,
the preset coefficient is less than 1.
8. The control apparatus for defrosting an air conditioning system according to claim 6,
the control device further comprises a determining module, configured to determine that the current ratio replaces the preset ratio according to that the current ratio is greater than the preset ratio.
9. The control apparatus for defrosting an air conditioning system according to claim 6,
the determining module is also used for determining the current heat exchange energy according to the product of the current temperature difference of the inlet and outlet water and the set water flow of the water heat exchange system when the water pump is a constant-speed water pump.
10. The control apparatus for defrosting an air conditioning system according to claim 6,
the determining module is also used for determining the current heat exchange energy according to the product of the current temperature difference of the inlet and outlet water and the current water flow of the water heat exchange system when the water pump is a variable frequency water pump.
11. A controller, characterized in that the controller comprises a computer readable storage medium and the control device for defrosting the air conditioning system according to any one of claims 6 to 10, wherein the computer readable storage medium stores instructions, and when the control device executes the instructions, the control method for defrosting the air conditioning system according to any one of claims 1 to 5 is realized.
12. An air conditioning system is characterized in that the air conditioning system comprises a refrigerant loop, a water heat exchange system and a controller,
the refrigerant loop is formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger, and an ambient temperature sensor is further arranged at the refrigerant loop;
the water heat exchange system comprises a water heat exchanger, a tail end heat exchanger and a water pump, wherein the water heat exchanger is in thermal contact with the second heat exchanger and is connected with the tail end heat exchanger, the second heat exchanger exchanges heat with the tail end heat exchanger through the water heat exchanger, a water inlet temperature sensor and a flowmeter are arranged at a water inlet of the water heat exchanger, a water outlet temperature sensor is arranged at a water outlet of the water heat exchanger, and the water pump is arranged in a pipeline of the water heat exchange system;
a controller electrically connected to the compressor, the inlet water temperature sensor, the outlet water temperature sensor, the ambient temperature sensor, and the flow meter, the controller according to claim 11.
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