CN114087747A - Control method and control device of air conditioning system, controller and air conditioning system - Google Patents
Control method and control device of air conditioning system, controller and air conditioning system Download PDFInfo
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- CN114087747A CN114087747A CN202010749362.6A CN202010749362A CN114087747A CN 114087747 A CN114087747 A CN 114087747A CN 202010749362 A CN202010749362 A CN 202010749362A CN 114087747 A CN114087747 A CN 114087747A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 210
- 239000003507 refrigerant Substances 0.000 claims abstract description 71
- 238000001704 evaporation Methods 0.000 claims description 11
- 238000010257 thawing Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- 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
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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
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method, a control device, a controller and an air conditioning system of 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, the throttling device comprises an electronic expansion valve and a control valve which are connected in parallel on the refrigerant loop, the air conditioning system also comprises a water heat exchange system for exchanging heat with the second heat exchanger, and the control method comprises the following steps: controlling the control valve to be opened according to the condition that the water inlet temperature of the water heat exchange system is lower than a first preset water inlet temperature when a refrigerant in a second heat exchanger of the air conditioning system evaporates and absorbs heat; and controlling the control valve to close according to the outlet pressure value of the second heat exchanger reaching the preset outlet pressure threshold value. The control method of the air conditioning system controls the control valve to open according to the condition that the water inlet temperature of the water heat exchange system is lower than the first preset water inlet temperature when the refrigerant in the second heat exchanger evaporates and absorbs heat, so that the circulation of the refrigerant is improved, and the risk that the second heat exchanger is frozen due to being in a low-temperature environment is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method, a control device, a controller and an air conditioning system of the air conditioning system.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
At present, water machine air conditioning systems exchanging heat through water machines are more and more widely applied, and users also put forward higher and higher requirements on the operation range of the water machine air conditioning systems, wherein the starting of a refrigeration mode of the water machine air conditioning systems at a low water inlet temperature is an important use scene. When the refrigeration mode is started at a low water inlet temperature, the inlet temperature of the evaporator which exchanges heat with the water machine is below 0 ℃ for a period of time, and the risk of freezing the evaporator exists. Therefore, the method adopted by most water machine air conditioning systems is as follows: after the water machine air-conditioning system starts a refrigeration mode, a heating mode is operated for 1-2 minutes in advance, so that the temperature of a water tank in the water machine air-conditioning system is increased, and the water inlet temperature when the refrigeration mode is started is further increased. However, the heating mode which is operated for 1-2 minutes in advance can cause a terminal fan coil unit which is connected with the water tank and is positioned indoors to blow out hot air, and the use experience of indoor users is seriously influenced.
In addition, the water machine air-conditioning system operates and refrigerates under high ambient temperature and high water outlet temperature, the opening degree of an electronic expansion valve of the water machine air-conditioning system is opened to the maximum, the exhaust pressure of the water machine air-conditioning system is still high, and even the phenomenon of exhaust pressure protection can be led out. In order to enable the water machine air conditioning system to normally operate, the existing solution is to set the adjustment range of the throttling device to be larger, but this will cause the adjustment precision of the throttling device to be reduced under most working conditions, thereby causing the cooling capacity, the heating capacity and the energy efficiency of the water machine air conditioning system to be reduced.
Furthermore, when water machine air conditioning system starts the mode of heating in low temperature environment, a large amount of unevaporated refrigerants have been stayed in the first heat exchanger, when water machine air conditioning system got into the defrosting mode, the cross valve was commuted the refrigerant, and first heat exchanger converts the evaporimeter into, and the refrigerant in the first heat exchanger is difficult to migrate to the entry of second heat exchanger rapidly, leads to the entry of second heat exchanger to last the low temperature low pressure condition of a period of time, and there is the risk of being frozen out in this in-process second heat exchanger.
Disclosure of Invention
The invention aims to solve the technical problem that the operation reliability of the air-conditioning system is reduced due to the fact that the flow of a refrigerant in the air-conditioning system cannot be reasonably controlled at least to a certain extent.
In order to achieve the above object, a first aspect of the present invention provides a 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, the throttling device includes an electronic expansion valve and a control valve connected in parallel to the refrigerant loop, the air conditioning system further includes a water heat exchange system exchanging heat with the second heat exchanger, and the control method includes: controlling the control valve to be opened according to the condition that the water inlet temperature of the water heat exchange system is lower than a first preset water inlet temperature when a refrigerant in a second heat exchanger of the air conditioning system evaporates and absorbs heat; and controlling the control valve to close according to the outlet pressure value of the second heat exchanger reaching the preset outlet pressure threshold value.
The control method of the air conditioning system controls the control valve to open according to the condition that the water inlet temperature of the water heat exchange system is lower than the first preset water inlet temperature when the refrigerant in the second heat exchanger evaporates and absorbs heat, so that the circulation of the refrigerant in the refrigerant loop is improved, and the risk that the second heat exchanger is frozen due to the fact that the second heat exchanger is in a low-temperature environment is reduced. Specifically, the opening degree of the electronic expansion valve is adjusted to be the maximum while the control valve is opened, the refrigerant flowing out of the first heat exchanger can flow to the second heat exchanger through the electronic expansion valve and the control valve simultaneously, and the temperature of the second heat exchanger can be increased by the refrigerant flowing out of the first heat exchanger, so that the risk that the second heat exchanger is frozen is reduced. When the outlet pressure value of the second heat exchanger reaches the preset outlet pressure threshold value, the refrigerant quantity flowing through the second heat exchanger is enough to maintain the second heat exchanger not to be frozen, and at the moment, the control valve can be closed to reduce the influence of opening the control valve for a long time on the refrigerating or heating effect of the air conditioning system.
In addition, the control method 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, when the refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat, and the water inlet temperature of the water heat exchange system is lower than a first preset water inlet temperature, controlling the control valve to open includes: determining the forced opening duration of the control valve according to the environment temperature of the air conditioning system and the water inlet temperature of the water heat exchange system; and updating the forced opening time length according to the time length required by the outlet pressure value of the second heat exchanger to reach the preset pressure value, wherein the preset pressure value is smaller than the preset outlet pressure threshold value.
According to an embodiment of the invention, the control method further comprises: controlling the control valve to be opened according to the condition that the inlet water temperature of the water heat exchange system is greater than or equal to a second preset inlet water temperature and the environment temperature of the air conditioning system is greater than or equal to a preset environment temperature when a refrigerant in a second heat exchanger of the air conditioning system evaporates and absorbs heat; and controlling the control valve to be closed according to the condition that the water inlet temperature of the water heat exchange system is less than the second preset water inlet temperature and the environment temperature of the air conditioning system is less than the preset environment temperature.
According to an embodiment of the invention, the control method further comprises: acquiring the outlet temperature of a first heat exchanger when a refrigerant in a second heat exchanger of the air-conditioning system evaporates and absorbs heat; and controlling the control valve to be opened according to the condition that the outlet temperature is higher than the first preset outlet temperature, or the outlet temperature is higher than the second preset outlet temperature and lower than the first preset outlet temperature, and the temperature increasing rate of the outlet temperature is higher than the preset temperature increasing rate, wherein the first preset outlet temperature is higher than the second preset outlet temperature.
According to an embodiment of the invention, the control method further comprises: controlling the control valve to be opened according to the change of the air conditioning system from the evaporation and heat absorption state of the refrigerant in the second heat exchanger to the defrosting mode of the first heat exchanger; and controlling the control valve to be closed according to the fact that the water temperature difference value of the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than a preset water temperature difference value, or the increasing rate of the water temperature difference value is larger than a preset increasing rate.
The second aspect of the present invention further provides a 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 throttling device includes an electronic expansion valve and a control valve connected in parallel on the refrigerant loop, 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 control method for the air conditioning system of the first aspect of the present invention, and the control device includes: and the control module is used for controlling the control valve to be opened when the water temperature of the water heat exchange system is lower than a first preset water inlet temperature according to the evaporation and heat absorption of the refrigerant in the second heat exchanger of the air conditioning system, and controlling the control valve to be closed when the outlet pressure value of the second heat exchanger reaches a preset outlet pressure threshold value.
According to an embodiment of the present invention, the control apparatus further includes: the determining module is used for determining the forced opening duration of the control valve according to the ambient temperature of the air conditioning system and the water inlet temperature of the water heat exchange system; and the updating module is used for updating the forced opening time length according to the time length required by the outlet pressure value of the second heat exchanger to reach the preset pressure value, and the preset pressure value is smaller than the preset outlet pressure threshold value.
According to an embodiment of the present invention, the control module is further configured to control the control valve to open according to that when the refrigerant evaporates and absorbs heat in the second heat exchanger of the air conditioning system, the inlet water temperature of the water heat exchange system is greater than or equal to a second preset inlet water temperature and the environment temperature of the air conditioning system is greater than or equal to a preset environment temperature; the control module is also used for controlling the control valve to be closed according to the condition that the water inlet temperature of the water heat exchange system is less than the second preset water inlet temperature and the environment temperature of the air conditioning system is less than the preset environment temperature.
According to an embodiment of the present invention, the control apparatus further includes: the acquisition module is used for acquiring the outlet temperature of the first heat exchanger when a refrigerant in a second heat exchanger of the air conditioning system evaporates and absorbs heat; the control module is also used for controlling the control valve to open according to the condition that the outlet temperature is greater than the first preset outlet temperature, or the outlet temperature is greater than the second preset outlet temperature and less than the first preset outlet temperature, and the temperature increasing rate of the outlet temperature is greater than the preset temperature increasing rate, wherein the first preset outlet temperature is greater than the second preset outlet temperature.
According to an embodiment of the present invention, the control apparatus further includes: the control module is further configured to: controlling the control valve to be opened according to the change of the air conditioning system from the evaporation and heat absorption state of the refrigerant in the second heat exchanger to the defrosting mode of the first heat exchanger; and controlling the control valve to be closed according to the fact that the water temperature difference value of the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than a preset water temperature difference value, or the increasing rate of the water temperature difference value is larger than a preset increasing rate.
The third aspect of the present invention also provides a controller including a computer-readable storage medium and the control device of the air conditioning system according to the second aspect of the present invention, the computer-readable storage medium having stored therein instructions that, when executed by the control device of the air conditioning system, implement the control method of the air conditioning system according to the first aspect of the present invention.
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; the water heat exchange system comprises a water heat exchanger and a tail end heat exchanger, the water heat exchanger exchanges heat 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 exchange system, a water inlet temperature sensor is arranged at a water inlet of the water heat exchanger, and a water outlet temperature sensor is arranged at a water outlet of the water heat exchanger; the controller is electrically connected with the electronic expansion valve, the control valve, the environment temperature sensor, the pressure sensor, the outlet temperature sensor, the inlet water temperature sensor and the outlet water temperature sensor, 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 flowchart of a control method of an air conditioning system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the outlet pressure value and the open/close state of the control valve of the second heat exchanger according to one embodiment of the present invention;
FIG. 5 is a table of the water inlet temperature of the water heat exchanger, the ambient temperature of the air conditioning system, and the time period of the forced opening of the control valve in accordance with one embodiment of the present invention;
fig. 6 is a flowchart of a control method of an air conditioning system according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a control method of a control valve according to an embodiment of the present invention;
fig. 8 is a block diagram illustrating a control apparatus 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; 31. an outlet temperature sensor;
41. an electronic expansion valve; 42. a control valve;
50. a second heat exchanger; 51. a pressure sensor;
60. a water heat exchanger; 61. an inlet water temperature sensor; 62. an effluent temperature sensor;
70. a water tank;
800. a control device; 810. a control module; 820. a determination module; 830. an update module; 840. and an acquisition 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, in the embodiment of the present invention, the control method of the air conditioning system is described by using the central air conditioner, but the control method of the air conditioning system of the present invention is not limited to be applied to the central air conditioner, and is also applicable to other types of multi-split air-conditioning systems, and such adjustment belongs to the protection scope of the 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 control method, the control device 800, 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 a refrigerant loop and a water heat exchange system, the refrigerant loop is formed by sequentially connecting a compressor 10, a first heat exchanger 30, a throttling device and a second heat exchanger 50, the throttling device includes an electronic expansion valve 41 and a control valve 42 which are connected in parallel on the refrigerant loop, a water heat exchanger 60 and a terminal heat exchanger (not shown in the figure) of the water heat exchange system, the water heat exchanger 60 exchanges heat with the second heat exchanger 50 and is connected with the terminal heat exchanger, the second heat exchanger 50 exchanges heat with the terminal heat exchanger through the water heat exchange system, the controller 20 is electrically connected with the electronic expansion valve 41 and the control valve 42, the control valve 42 may be a solenoid valve and the controller 20 is a 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 a refrigerant loop and a water heat exchange system, the water heat exchange system includes a water heat exchanger 60 exchanging heat with the second heat exchanger 50, and a water tank 70 and a terminal heat exchanger connected to the water heat exchanger 60, the terminal heat exchanger is disposed indoors, both the second heat exchanger 50 and the water heat exchanger 60 are disposed outdoors, the second heat exchanger 50 exchanges heat with the terminal heat exchanger through the water heat exchanger 60, so as to achieve the purpose of cooling or heating indoors, 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.
Further, the first heat exchanger 30 is a fin-type heat exchanger, the second heat exchanger 50 is a shell-and-tube heat exchanger, the outlet of the second heat exchanger 50 is provided with a pressure sensor 51, the outlet of the first heat exchanger 30 is provided with an outlet temperature sensor 31, the water inlet of the water heat exchange system is provided with a water inlet temperature sensor 61, the water outlet of the water heat exchange system is provided with a water outlet temperature sensor 62, the refrigerant loop is provided with an ambient temperature sensor, the controller 20 is electrically connected with the electronic expansion valve 41, the control valve 42, the ambient temperature sensor, the pressure sensor 51, the outlet temperature sensor 31, the water inlet temperature sensor 61 and the water outlet temperature sensor 62, the controller 20 is used for receiving the ambient temperature monitored by the ambient temperature sensor, the outlet pressure value of the second heat exchanger 50 monitored by the pressure temperature sensor, the outlet temperature of the first heat exchanger 30 monitored by the outlet temperature sensor 31, the outlet temperature of the first heat exchanger 30, the ambient temperature sensor 51, and the outlet temperature sensor are monitored by the pressure temperature sensor 42, and the outlet temperature sensor, The controller 20 controls the on/off of the control valve 42 according to the ambient temperature, the outlet temperature, the inlet temperature and the outlet temperature, and determines the forced on duration of the control valve 42 according to the ambient temperature and the inlet temperature. 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 when the control device 200 executes the instructions, the control method for oil return of the air conditioning system 100 can be implemented.
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.
The first embodiment is as follows: 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, controlling the control valve 42 to be opened according to the condition that the temperature of the inlet water of the water heat exchange system is lower than a first preset inlet water temperature when the refrigerant in the second heat exchanger 50 of the air conditioning system 100 evaporates and absorbs heat; and S320, controlling the control valve 42 to close according to the condition that the outlet pressure value of the second heat exchanger 50 is within the preset outlet pressure threshold value.
In this embodiment, the control method of the air conditioning system 100 controls the control valve 42 to open according to the condition that the refrigerant in the second heat exchanger 50 absorbs heat during evaporation and the inlet water temperature of the water heat exchange system is lower than the first preset inlet water temperature, so as to increase the circulation amount of the refrigerant in the refrigerant circuit and reduce the risk of freezing the second heat exchanger 50 in the low temperature environment. Specifically, the opening degree of the electronic expansion valve 41 is adjusted to the maximum while the control valve 42 is opened, so that the refrigerant flowing out of the first heat exchanger 30 can flow to the second heat exchanger 50 through the electronic expansion valve 41 and the control valve 42 at the same time, and the temperature of the second heat exchanger 50 can be increased by the refrigerant flowing out of the first heat exchanger 30, thereby reducing the risk of freezing the second heat exchanger 50.
With continuing reference to fig. 1, 2, and 3, step S310 includes, in accordance with one embodiment of the present invention: determining the forced opening time of the control valve 42 according to the ambient temperature of the air conditioning system 100 and the inlet water temperature of the water heat exchange system; and updating the forced opening time length according to the time length required by the outlet pressure value of the second heat exchanger 50 to reach the preset pressure value, wherein the preset pressure value is smaller than the preset outlet pressure threshold value.
In this embodiment, when the outlet pressure value of the second heat exchanger 50 reaches the preset outlet pressure threshold, it indicates that the amount of the refrigerant flowing through the second heat exchanger 50 is sufficient to maintain the second heat exchanger 50 from being frozen, and at this time, the control valve 42 may be closed to reduce the influence of opening the control valve 42 for a long time on the cooling or heating energy of the air conditioning system 100. In order to make the control valve 42 have a sufficient opening duration, the present embodiment proposes a preset pressure value smaller than the preset outlet pressure threshold, that is, before the outlet pressure value of the second heat exchanger 50 does not reach the preset pressure value, the control valve 42 is forced to open, and after the outlet pressure value of the second heat exchanger 50 reaches the preset pressure value, the switch of the control valve 42 is adjusted so as to make the outlet pressure value of the second heat exchanger 50 reach the preset outlet pressure threshold.
Specifically, fig. 4 is a schematic diagram of an outlet pressure value Pe of the second heat exchanger 50 and an opening/closing state of the control valve 42 according to an embodiment of the present invention, and fig. 5 is a table diagram of an inlet water temperature of the water heat exchanger 60, an ambient temperature of the air conditioning system 100, and a forced opening time period of the control valve 42 according to an embodiment of the present invention. As shown in fig. 6, after the solenoid valve is opened, the forced opening time length of the solenoid valve (see fig. 5) is selected according to the ambient temperature Ta and the water inlet temperature Tw, and after the forced opening time length reaches the preset forced opening time length, the time length t when the outlet pressure value Pe of the second evaporator reaches the preset pressure value is recorded, and the forced opening time length in fig. 5 is corrected by the time length t. Then, the opening and closing of the electromagnetic valve are controlled according to fig. 4, and the outlet pressure value Pe of the second heat exchanger 50 is divided into different sections, and the control states of the electromagnetic valve corresponding to the outlet pressure values Pe of the different sections are different. If the outlet pressure value Pe of the second heat exchanger 50 monitored by the air conditioning system 100 is less than the preset pressure value Pe1, that is, the phenomenon that the inlet of the second heat exchanger 50 is still in the low-pressure state still exists, the solenoid valve is kept normally open, and if the outlet pressure value is detected to reach the preset pressure value and Pe3< Pe4, the solenoid valve is controlled to be continuously opened for 30s and then closed.
Example two: with continuing reference to fig. 1, 2, and 3, according to one embodiment of the invention, the control method further includes: when the refrigerant in the second heat exchanger 50 of the air conditioning system 100 evaporates and absorbs heat, the inlet water temperature of the water heat exchange system is greater than or equal to a second preset inlet water temperature, and the environment temperature of the air conditioning system 100 is greater than or equal to a preset environment temperature, the control valve 42 is controlled to be opened; and controlling the control valve 42 to close according to the inlet water temperature of the water heat exchange system being less than the second preset inlet water temperature and the environment temperature of the air conditioning system 100 being less than the preset environment temperature.
In this embodiment, when the air conditioning system 100 cools the second heat exchanger 50 at a high ambient temperature and a high water inlet temperature, the air conditioning system 100 opens the solenoid valve on the basis of adjusting the opening of the electronic expansion valve 41 to the maximum value, so as to reduce the return air pressure in the air conditioning system 100, and by accurately controlling the on-off of the solenoid valve, the purpose of reducing the return air pressure is achieved on the basis of minimizing the loss of the cooling capacity of the air conditioning system 100, for example, the ambient temperature Ta is greater than or equal to 45 ℃ and the water inlet temperature Tw is greater than or equal to 14 ℃, the solenoid valve is opened, and the solenoid valve is closed when Ta is less than 44 ℃ or the water inlet temperature Tw is less than 14 ℃.
Example three: with continuing reference to fig. 1, 2 and 3, obtaining the actual return air superheat of the air conditioning system 100 according to one embodiment of the invention includes: acquiring the outlet temperature of the first heat exchanger 30 according to the evaporation and heat absorption of the refrigerant in the second heat exchanger 50 of the air conditioning system 100; and controlling the control valve 42 to be opened according to the condition that the outlet temperature is greater than the first preset outlet temperature, or the outlet temperature is greater than the second preset outlet temperature and less than the first preset outlet temperature, and the temperature increasing rate of the outlet temperature is greater than the preset temperature increasing rate, wherein the first preset outlet temperature is greater than the second preset outlet temperature.
In this embodiment, when the air conditioning system 100 cools the second heat exchanger 50 at a high ambient temperature and a high water intake temperature, the air conditioning system 100 opens the solenoid valve on the basis of adjusting the opening degree of the electronic expansion valve 41 to the maximum value, thereby reducing the return air pressure in the air conditioning system 100, and precisely controls the on/off of the solenoid valve, so as to achieve the purpose of reducing the return air pressure on the basis of minimizing the loss of the cooling capacity of the air conditioning system 100, when the outlet temperature T3 of the first heat exchanger 30 is greater than 60 ℃, 1T 3 temperature value is recorded every 60s, the T3 temperature value at the n +2 time is greater than or equal to the T3 value at the n time and exceeds 2 ℃, the T3 temperature value at the n +3 time is greater than or equal to the T3 value at the n +1 time and exceeds 2 ℃, the rising rate of the T3 satisfies the above conditions, and the solenoid valve is opened. Or as shown in fig. 7, when the outlet temperature T3 of the first heat exchanger 30 is greater than T1, the solenoid valve is directly controlled to be opened, and when the outlet temperature T3 of the first heat exchanger 30 is less than T0, the solenoid valve is controlled to be closed.
Example four: according to an embodiment of the invention, the control method further comprises: according to the change of the air conditioning system 100 from the evaporation and heat absorption state of the refrigerant in the second heat exchanger 50 to the defrosting mode of the first heat exchanger 30, the control valve 42 is controlled to be opened; and controlling the control valve 42 to close according to the fact that the water temperature difference value between the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than the preset water temperature difference value or the increasing rate of the water temperature difference value is larger than the preset increasing rate.
In this embodiment, when the air conditioning system 100 is changed from the evaporation and heat absorption state of the refrigerant in the second heat exchanger 50 to the defrosting mode for the first heat exchanger 30, the electromagnetic valve is opened to enable the refrigerant to be rapidly transferred from the first heat exchanger 30 to the second heat exchanger 50, so as to reduce the risk that the second heat exchanger 50 is frozen in a low-temperature environment. Specifically, the difference Δ T between the inlet water temperature and the outlet water temperature of the water heat exchange system is defined as Two-Tw, Two is the outlet water temperature, and Tw is the inlet water temperature, when Δ T is less than 0, it indicates that the air conditioning system 100 is refrigerating the second heat exchanger 50 and the water heat exchange system, heating and defrosting the first heat exchanger 30, and when Δ T is less than 0 and reaches the minimum value, it indicates that the air conditioning system 100 completes heating and defrosting the first heat exchanger 30. When the air conditioning system 100 enters a heating and defrosting mode for the first heat exchanger 30, the solenoid valve is opened, the delta T reduction rate is calculated, 1 delta T value is recorded every 10s, the delta T value at the n +2 th moment is less than or equal to the delta T value at the n +1 th moment and exceeds 2 ℃, and the delta T value at the n +3 th moment is less than or equal to the delta T value at the n +1 th moment and exceeds 2 ℃. In this state, the Δ T decreasing rate indicates that the refrigerant in the refrigerant circuit has completed the transition from the first heat exchanger 30 to the inlet of the second heat exchanger 50, and the solenoid valve is closed.
As shown in fig. 8, the second aspect of the present invention further provides a control device 800 of an air conditioning system 100 corresponding to the first aspect of the present invention, the control device 800 being configured to execute the control method of the air conditioning system 100 according to the first aspect of the present invention, the control device 800 comprising: the control module 810 is configured to control the control valve 42 to open according to that an inlet water temperature of the water heat exchange system is lower than a first preset inlet water temperature when the refrigerant in the second heat exchanger 50 of the air conditioning system 100 evaporates and absorbs heat, and control the control valve 42 to close according to that an outlet pressure value of the second heat exchanger 50 reaches a preset outlet pressure threshold value.
According to an embodiment of the present invention, the control device 800 further comprises: a determining module 820, configured to determine a forced opening duration of the control valve 42 according to an ambient temperature of the air conditioning system 100 and an inlet water temperature of the water heat exchange system; the updating module 830 is configured to update the forced opening time length according to a time length required by the outlet pressure value of the second heat exchanger 50 reaching a preset pressure value, where the preset pressure value is smaller than a preset outlet pressure threshold.
According to an embodiment of the present invention, the control module 810 is further configured to control the control valve 42 to open according to that when the refrigerant evaporates and absorbs heat in the second heat exchanger 50 of the air conditioning system 100, the inlet water temperature of the water heat exchange system is greater than or equal to the second preset inlet water temperature and the environment temperature of the air conditioning system 100 is greater than or equal to the preset environment temperature; the control module 810 is further configured to control the control valve 42 to close according to that the inlet water temperature of the water heat exchange system is less than the second preset inlet water temperature and the ambient temperature of the air conditioning system 100 is less than the preset ambient temperature.
According to an embodiment of the present invention, the control device 800 further comprises: an obtaining module 840, configured to obtain an outlet temperature of the first heat exchanger 30 according to evaporation and heat absorption of a cooling medium in the second heat exchanger 50 of the air conditioning system 100; the control module 810 is further configured to control the control valve 42 to open according to whether the outlet temperature is greater than a first preset outlet temperature, or the outlet temperature is greater than a second preset outlet temperature and less than the first preset outlet temperature and the temperature increase rate of the outlet temperature is greater than the preset temperature increase rate, where the first preset outlet temperature is greater than the second preset outlet temperature.
According to an embodiment of the present invention, the control device 800 further comprises: the control module 810 is further configured to: according to the change of the air conditioning system 100 from the evaporation and heat absorption state of the refrigerant in the second heat exchanger 50 to the defrosting mode of the first heat exchanger 30, the control valve 42 is controlled to be opened; and controlling the control valve 42 to close according to the fact that the water temperature difference value between the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than the preset water temperature difference value or the increasing rate of the water temperature difference value is larger than the preset increasing rate.
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, which is stored in a computer-readable storage medium 210 and includes several instructions to enable a control device 800 (such as a processor) or a single chip (such as a single chip, a chip, or the like) to perform all or part of the steps in the method according to the various 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 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 throttling device comprises an electronic expansion valve and a control valve which are connected on the refrigerant loop in parallel, 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:
controlling the control valve to be opened according to the condition that when a refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat and the water inlet temperature of the water heat exchange system is lower than a first preset water inlet temperature;
and controlling the control valve to close according to the outlet pressure value of the second heat exchanger reaching the preset outlet pressure threshold value.
2. The method as claimed in claim 1, wherein the controlling the control valve to open according to the condition that the temperature of the inlet water of the water heat exchange system is lower than a first preset inlet water temperature when the refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat comprises:
determining the forced opening duration of the control valve according to the ambient temperature of the air conditioning system and the water inlet temperature of the water heat exchange system;
updating the forced opening time length according to the time length required by the outlet pressure value of the second heat exchanger to reach a preset pressure value,
the preset pressure value is smaller than the preset outlet pressure threshold value.
3. The control method of an air conditioning system according to claim 1, characterized by further comprising:
controlling the control valve to be opened according to the condition that the water inlet temperature of the water heat exchange system is greater than or equal to a second preset water inlet temperature and the environment temperature of the air conditioning system is greater than or equal to a preset environment temperature when a refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat;
and controlling the control valve to be closed according to the condition that the water inlet temperature of the water heat exchange system is less than the second preset water inlet temperature and the environment temperature of the air conditioning system is less than the preset environment temperature.
4. The control method of an air conditioning system according to claim 1, characterized by further comprising:
acquiring the outlet temperature of the first heat exchanger when a refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat;
controlling the control valve to open according to the condition that the outlet temperature is higher than a first preset outlet temperature, or the outlet temperature is higher than a second preset outlet temperature and lower than the first preset outlet temperature and the temperature increasing rate of the outlet temperature is higher than a preset temperature increasing rate,
the first preset outlet temperature is greater than the second preset outlet temperature.
5. The control method of an air conditioning system according to claim 1, characterized by further comprising:
controlling the control valve to be opened according to the change of the air conditioning system from the state of evaporating and absorbing heat of the refrigerant in the second heat exchanger to the defrosting mode of the first heat exchanger;
and controlling the control valve to be closed according to the condition that the water temperature difference value between the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than a preset water temperature difference value, or the increasing rate of the water temperature difference value is larger than a preset increasing rate.
6. A control device of an air conditioning system, wherein 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 throttling device includes an electronic expansion valve and a control valve connected in parallel on the refrigerant loop, 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 control method of the air conditioning system according to any one of claims 1 to 5, and the control device includes:
the control module is used for controlling the control valve to open according to the condition that the water inlet temperature of the water heat exchange system is lower than a first preset water inlet temperature when the refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat,
and the control valve is controlled to be closed according to the condition that the outlet pressure value of the second heat exchanger reaches the preset outlet pressure threshold value.
7. The control device of an air conditioning system according to claim 6, characterized by further comprising:
the determining module is used for determining the forced opening duration of the control valve according to the ambient temperature of the air conditioning system and the water inlet temperature of the water heat exchange system;
an updating module for updating the forced opening time length according to the time length required by the outlet pressure value of the second heat exchanger to reach a preset pressure value,
the preset pressure value is smaller than the preset outlet pressure threshold value.
8. The control device of an air conditioning system according to claim 6,
the control module is also used for controlling the control valve to be opened according to the condition that the water inlet temperature of the water heat exchange system is greater than or equal to a second preset water inlet temperature and the environment temperature of the air conditioning system is greater than or equal to a preset environment temperature when a refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat;
the control module is also used for controlling the control valve to be closed according to the fact that the water inlet temperature of the water heat exchange system is smaller than the second preset water inlet temperature and the environment temperature of the air conditioning system is smaller than the preset environment temperature.
9. The control device of an air conditioning system according to claim 1, characterized by further comprising:
the acquisition module is used for acquiring the outlet temperature of the first heat exchanger when a refrigerant in the second heat exchanger of the air conditioning system evaporates and absorbs heat;
the control module is also used for controlling the control valve to open according to the condition that the outlet temperature is higher than a first preset outlet temperature, or the outlet temperature is higher than a second preset outlet temperature and lower than the first preset outlet temperature and the temperature increasing rate of the outlet temperature is higher than a preset temperature increasing rate,
the first preset outlet temperature is greater than the second preset outlet temperature.
10. The control device of an air conditioning system of claim 1, wherein the control module is further configured to:
controlling the control valve to be opened according to the change of the air conditioning system from the state of evaporating and absorbing heat of the refrigerant in the second heat exchanger to the defrosting mode of the first heat exchanger;
and controlling the control valve to be closed according to the condition that the water temperature difference value between the inlet water temperature and the outlet water temperature of the water heat exchange system is smaller than a preset water temperature difference value, or the increasing rate of the water temperature difference value is larger than a preset increasing rate.
11. A controller characterized by comprising a computer-readable storage medium and a control device of an air conditioning system according to any one of claims 6 to 10, the computer-readable storage medium having stored therein instructions that, when executed by the control device, implement the control method of the air conditioning system according to any one of claims 1 to 5.
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, wherein the throttling device comprises an electronic expansion valve and a control valve which are connected in parallel on the refrigerant loop, an ambient temperature sensor is arranged on the refrigerant loop, a pressure sensor is arranged at an outlet of the second heat exchanger, and an outlet temperature sensor is arranged at an outlet of the first heat exchanger;
the water heat exchange system comprises a water heat exchanger and a tail end heat exchanger, the water heat exchanger exchanges heat 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 exchange system, a water inlet temperature sensor is arranged at a water inlet of the water heat exchanger, and a water outlet temperature sensor is arranged at a water outlet of the water heat exchanger;
the controller is electrically connected to the electronic expansion valve, the control valve, the ambient temperature sensor, the pressure sensor, the outlet temperature sensor, the inlet water temperature sensor and the outlet water temperature sensor, and the controller is the controller according to claim 11.
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