CN114034118A - 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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- CN114034118A CN114034118A CN202010714500.7A CN202010714500A CN114034118A CN 114034118 A CN114034118 A CN 114034118A CN 202010714500 A CN202010714500 A CN 202010714500A CN 114034118 A CN114034118 A CN 114034118A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 44
- 230000001276 controlling effect Effects 0.000 claims description 19
- 230000003044 adaptive effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
-
- 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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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (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 an outer machine system composed of a refrigerant loop, the air conditioning system also comprises a plurality of inner machine systems in thermal contact with the outer machine system, each inner machine system comprises a tail end heat exchanger and a fan arranged close to the tail end heat exchanger, and the control method comprises the following steps: acquiring the air outlet temperature of the tail end heat exchanger and the return air temperature of the fan; and controlling the inlet temperature of the terminal heat exchanger to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature. The invention adjusts the inlet temperature of the tail end heat exchanger according to the air outlet temperature of the tail end heat exchanger and the air return temperature of the fan, thereby achieving the purpose of adjusting the air return temperature, the air outlet temperature and the indoor temperature.
Description
Technical Field
The invention relates to the technical field of household appliances, 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, most of modular air conditioning systems have independent control of an air-cooled heat pump unit and a tail end fan coil unit, and the air-cooled heat pump unit and the tail end fan coil unit do not have communication during operation. The air-cooled heat pump unit operates according to a preset instruction of a controller of the air-conditioning system and provides chilled water or hot water with constant temperature for each terminal fan-coil unit. Take the case of an air-cooled heat pump unit supplying cold to a terminal fan coil unit: and opening a water valve of the air-cooled heat pump unit, wherein chilled water of the air-cooled heat pump unit flows through the tail end fan coil, and a fan near the tail end fan coil rotates to cool indoor air. And after the indoor temperature reaches the set temperature of the tail end fan coil unit, closing a water valve of the air-cooled heat pump unit. In the process of refrigerating or heating indoor air by the air-cooled heat pump unit through the terminal fan coil unit, because the loads of different indoor environments are different, the requirements of users on the air outlet temperature of the terminal fan coil unit are different, so that the following problems exist in the refrigerating or heating process:
1. the outlet water temperature of the air-cooled heat pump unit is too high, indoor air cannot be cooled rapidly, and the dehumidification requirements of part of indoor users cannot be met;
2. the outlet water temperature of the air-cooled heat pump unit is too low, so that the coil pipe coiling unit of the tail end fan excessively dehumidifies indoor air. Correspondingly, the air outlet temperature of the tail end fan coil unit is low due to the fact that the air outlet temperature is too low, and the body feeling comfort of a user is poor. And the energy efficiency of the air-cooled heat pump unit is reduced when the air-cooled heat pump unit operates at the low water outlet temperature, and the energy-saving effect cannot be achieved.
Disclosure of Invention
The invention aims to solve the technical problem that a plurality of internal machine systems in thermal contact with an external machine system cannot independently regulate the indoor temperature according to the requirements of users 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, the air conditioning system including an external unit system composed of a refrigerant loop, the air conditioning system further including a plurality of internal unit systems in thermal contact with the external unit system, each of the internal unit systems including a terminal heat exchanger and a fan disposed near the terminal heat exchanger, the control method including: acquiring the air outlet temperature of the tail end heat exchanger and the return air temperature of the fan; and controlling the inlet temperature of the terminal heat exchanger to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
The invention adjusts the inlet temperature of the tail end heat exchanger according to the air outlet temperature of the tail end heat exchanger and the air return temperature of the fan, thereby achieving the purpose of adjusting the air return temperature, the air outlet temperature and the indoor temperature.
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 invention, the air conditioning system further comprises a water inlet valve arranged at the inlet end of the terminal heat exchanger and a bypass valve for communicating the inlet end with the return end of the terminal heat exchanger, and the control method comprises the following steps: the water inlet quantity of the tail end heat exchanger is controlled by controlling the opening degree of the water inlet valve and the opening degree of the bypass valve, so that the purpose of adjusting the inlet temperature is achieved.
According to an embodiment of the invention, the control method further comprises: and controlling the inlet temperature of the tail end heat exchanger to be adaptively adjusted according to a PID control mode until the return air temperature is within a preset return air temperature threshold range: tin (t) ═ Kp E (t) + Ki [ E (t) + E (t-1) + E (t-2) + E (t-3) ] + Kd [ E (t) -E (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
According to an embodiment of the invention, the control method further comprises: adjusting the inlet temperature of the tail end heat exchanger according to a PID control mode, and carrying out adaptive adjustment until the outlet air temperature is within a threshold range of a preset outlet air temperature: tin (t) ═ kpf (t) + Ki [ F (t) + F (t-1) + F (t-2) + F (t-3) ] + Kd [ F (t) -F (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the outlet air temperature monitored at the moment t and the preset outlet air temperature, F (t-1) is the difference value of the outlet air temperature monitored at the moment t-1 and the preset outlet air temperature, F (t-2) is the difference value of the outlet air temperature monitored at the moment t-2 and the preset outlet air temperature, and F (t-3) is the difference value of the outlet air temperature monitored at the moment t-3 and the preset outlet air temperature.
According to an embodiment of the invention, the control method further comprises: the return air temperature is controlled to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and is in a change state.
The second aspect of the present invention further provides a control device for an air conditioning system, where the air conditioning system includes an external unit system composed of a refrigerant loop, the air conditioning system further includes a plurality of internal unit systems in thermal contact with the external unit system, each internal unit system includes a terminal heat exchanger and a fan disposed near the terminal heat exchanger, the control device is configured to execute the control method for the air conditioning system according to the first aspect of the present invention, and the control device includes: the acquisition module is used for acquiring the air outlet temperature of the tail end heat exchanger and the return air temperature of the fan; and the control module is used for controlling the inlet temperature of the terminal heat exchanger to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
According to an embodiment of the present invention, the air conditioning system further includes a water inlet valve disposed at the inlet end of the end heat exchanger and a bypass valve communicating the inlet end with the return end of the end heat exchanger, and the control module is further configured to: the water inlet quantity of the tail end heat exchanger is controlled by controlling the opening degree of the water inlet valve and the opening degree of the bypass valve, so that the purpose of adjusting the inlet temperature is achieved.
According to one embodiment of the invention, the control module is further configured to: and controlling the inlet temperature of the tail end heat exchanger to be adaptively adjusted according to a PID control mode until the return air temperature is within a preset return air temperature threshold range: tin (t) ═ Kp E (t) + Ki [ E (t) + E (t-1) + E (t-2) + E (t-3) ] + Kd [ E (t) -E (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
According to one embodiment of the invention, the control module is further configured to: adjusting the inlet temperature of the tail end heat exchanger according to a PID control mode, and carrying out adaptive adjustment until the outlet air temperature is within a threshold range of a preset outlet air temperature: tin (t) ═ kpf (t) + Ki [ F (t) + F (t-1) + F (t-2) + F (t-3) ] + Kd [ F (t) -F (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the outlet air temperature monitored at the moment t and the preset outlet air temperature, F (t-1) is the difference value of the outlet air temperature monitored at the moment t-1 and the preset outlet air temperature, F (t-2) is the difference value of the outlet air temperature monitored at the moment t-2 and the preset outlet air temperature, and F (t-3) is the difference value of the outlet air temperature monitored at the moment t-3 and the preset outlet air temperature.
According to one embodiment of the invention, the control module is further configured to: the return air temperature is controlled to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and is in a change state.
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 an outer machine system and a plurality of inner machine systems in thermal contact with the outer machine system, wherein the outer machine system comprises a refrigerant loop, and the refrigerant loop is formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger; the indoor unit system comprises a water heat exchanger, a tail end heat exchanger and a fan, 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 valve and an inlet temperature sensor are arranged at the inlet end of the tail end heat exchanger, a bypass valve is arranged between the inlet end and the return end of the tail end heat exchanger, the fan is arranged at a position close to the tail end heat exchanger, and an air outlet temperature sensor and an air return temperature sensor are arranged at the fan; and the controller is electrically connected with the water inlet valve, the bypass valve, the inlet temperature sensor, the air outlet temperature sensor and the return air 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 flow chart of adjusting the inlet temperature of the end heat exchanger according to one embodiment of the present invention;
fig. 5 is a flowchart of a control method of an air conditioning system according to another embodiment of the present invention;
fig. 6 is a flowchart of a control method of an air conditioning system according to still another embodiment of the present invention;
fig. 7 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;
40. a throttling device;
50. a second heat exchanger;
60. a water heat exchanger;
70. a terminal heat exchanger; 71. a water inlet valve; 72. a bypass valve; 73. an inlet temperature sensor;
80. a fan; 81. an air outlet temperature sensor; 82. a return air temperature sensor;
700. a control device; 710. an acquisition module; 720. and a control 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 control method of the air conditioning system of the present invention is not limited to be applied to a central air conditioner, but 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 700, the controller 20 and the air conditioning system 100 of the present invention, first, the air conditioning system 100 of the fourth aspect of the present invention is described in detail, according to an embodiment of the fourth aspect of the present invention, the air conditioning system 100 includes the controller 20, an outdoor unit system and a plurality of indoor unit systems in thermal contact with the outdoor unit system, the outdoor unit system includes a refrigerant loop, the refrigerant loop is formed by sequentially connecting a compressor 10, a first heat exchanger 30, a throttling device 40 and a second heat exchanger 50, the indoor unit system includes a water heat exchanger 60, a terminal heat exchanger 70 and a fan 80, 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 fan 80 is disposed near the terminal heat exchanger 70, 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 an external unit system and a plurality of internal unit systems in thermal contact with the external unit system, 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, and the second heat exchanger 50 in the external unit system exchanges heat with the terminal heat exchanger 70 in the internal unit system through the water heat exchanger 60, so as to achieve the purpose of cooling or heating the indoor space.
Furthermore, a water inlet valve 71 and an inlet temperature sensor 73 are arranged at the inlet end of the terminal heat exchanger 70, a bypass valve 72 is arranged between the inlet end and the return end of the terminal heat exchanger 70, an outlet air temperature sensor 81 and a return air temperature sensor 82 are arranged at the blower 80, the controller 20 is electrically connected with the water inlet valve 71, the bypass valve 72, the inlet temperature sensor 73, the outlet air temperature sensor 81 and the return air temperature sensor 82, for receiving the inlet temperature of the end heat exchanger 70 monitored by the inlet temperature sensor 73, the outlet temperature of the fan 80 monitored by the outlet temperature sensor 81, and the return air temperature of the fan 80 monitored by the return air temperature sensor 82, and controls the water inlet valve 71 and the bypass valve 72 according to the inlet temperature, the outlet temperature and the return air temperature, therefore, the return air temperature of the fan 80 is adjusted to be within the threshold range of the preset return air temperature or the outlet air temperature of the fan 80 is adjusted to be within the threshold range of the preset outlet air 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 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 air outlet temperature of the tail end heat exchanger 70 and the return air temperature of the fan 80; and S320, controlling the inlet temperature of the terminal heat exchanger 70 to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
In this embodiment, the inlet temperature of the end heat exchanger 70 is adjusted according to the outlet air temperature of the end heat exchanger 70 and the return air temperature at the fan 80, so as to achieve the purpose of adjusting the return air temperature, the outlet air temperature and the indoor temperature.
Further, the phenomenon that the air conditioning system 100 is frequently turned on and turned off according to the condition of partial indoor load is reduced, meanwhile, the air conditioning system 100 can utilize partial return water of the bypass valve 72 to adjust the water temperature of the air conditioning system 100, so that the air conditioning system 100 can meet the load requirements of different rooms, the energy consumption of the air conditioning system 100 is reduced, the air conditioning system 100 can control the air outlet temperatures of different indoor units, and the requirements of different indoor users on comfortable experiences of different air outlet temperatures are met.
As shown in fig. 4 and 5, specifically, according to an embodiment of the present invention, step S320 includes: the inlet temperature is adjusted by controlling the water inlet amount of the tail end heat exchanger 70 through controlling the opening degree of the water inlet valve 71 and the opening degree of the bypass valve 72, and the inlet water temperature Tin of the tail end heat exchanger 70 is controlled through comprehensively adjusting the water inlet valve 71Vi and the bypass water valve Vo of the tail end heat exchanger 70, so that when the return air temperature T1 is outside the threshold range of the preset return air temperature Ts, the outlet air temperature Tb of the tail end heat exchanger 70 is less than or equal to T2 and less than or equal to Ta (Ta and Tb are comfortable temperatures of the tail end heat exchanger 70) through adjusting the inlet temperature of the tail end heat exchanger 70.
Further, according to an embodiment of the present invention, the control method of the air conditioning system 100 further includes: the return air temperature is controlled to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and is in a change state.
In the embodiment, when the return air temperature T1 is outside the threshold range of the preset return air temperature Ts, the inlet temperature Tin is controlled according to the variation trend of the return air temperature T1, so that the temperature T1-Ts is more than or equal to-1 ℃ and less than or equal to 1 ℃. Specifically, when the return air temperature T1 is outside the threshold range of the preset return air temperature Ts, the trend of the change of the return air temperature T1 is analyzed: 1) if T1 rises or falls, adjusting the inlet temperature Tin; 2) if T1 is not changed, the control inlet temperature Tin is not changed. At the moment, the return air temperature T1 and the outlet air temperature T2 are not changed, namely the indoor air temperature is kept constant, and the outlet air temperature T2 meets the condition that Tb is not less than T2 and not more than Ta. A heat exchange equilibrium state is achieved from the heat exchange point of view, i.e., the heat load generated per unit time in the room (including the heat radiation from the outside environment to the room) is equal to the cooling load generated by the end heat exchanger 70.
As shown in fig. 1, 2 and 6, according to an embodiment of the present invention, step S320 further includes: the inlet temperature of the end heat exchanger 70 is controlled according to the PID control mode to make adaptive adjustment until the return air temperature is within the threshold range of the preset return air temperature: tin (t) ═ Kp E (t) + Ki [ E (t) + E (t-1) + E (t-2) + E (t-3) ] + Kd [ E (t) -E (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
In the embodiment, the threshold ranges of the return air temperature T1, the outlet air temperature T2 and the preset return air temperature Ts are monitored firstly, the inlet temperature is determined according to the lowest value of the preset return air temperature Ts, then the variation trend of T1(T) is determined according to whether the return air temperature T1 is within the threshold range of the preset return air temperature, and the variation trend of T1(T) is determined according to the return air temperature T1(T) and the return air temperature T1(T-3), and finally the inlet temperature Tin is adjusted through a PID control mode, wherein the PID control mode is as follows: and defining the difference between the preset return air temperature and the current measured return air temperature as an error E (t) at the current moment (t moment), an error E (t-1) at the t-1 moment, an error E (t-1) at the t-2 moment and an error E (t-3) at the t-3 moment. The inlet temperature of the end heat exchanger 70 at the present time (time t) is Tin (t), and the inlet temperature of the end heat exchanger 70 at time t-1 is Tin (t-1). Kp is the proportional regulating coefficient of the inlet temperature Tin, Ki is the integral regulating coefficient of the inlet temperature Tin, Kd is the differential regulating coefficient of the inlet temperature Tin, and the corresponding PID regulating equation is as follows:
Tin(t)＝Kp*E(t)+Ki*[E(t)+E(t-1)+E(t-2)+E(t-3)]+Kd*[E(t)-E(t-1)]。
as shown in fig. 1, 2 and 6, according to an embodiment of the present invention, step S320 further includes: adjusting the inlet temperature of the end heat exchanger 70 according to the PID control mode to perform adaptive adjustment until the outlet air temperature is within the threshold range of the preset outlet air temperature: tin (t) ═ kpf (t) + Ki [ F (t) + F (t-1) + F (t-2) + F (t-3) ] + Kd [ F (t) -F (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the outlet air temperature monitored at the moment t and the preset outlet air temperature, F (t-1) is the difference value of the outlet air temperature monitored at the moment t-1 and the preset outlet air temperature, F (t-2) is the difference value of the outlet air temperature monitored at the moment t-2 and the preset outlet air temperature, and F (t-3) is the difference value of the outlet air temperature monitored at the moment t-3 and the preset outlet air temperature.
In the embodiment, the air return temperature T1, the air outlet temperature T2 and the threshold range of the preset air return temperature Ts are monitored firstly, the inlet temperature is determined according to the lowest value of the preset air return temperature Ts, then the inlet temperature is controlled to be unchanged according to whether the air outlet temperature T1 is within the threshold range (Tb-Ta) of the preset air return temperature, if the air outlet temperature T1 is within the threshold range (Tb-Ta) of the preset air return temperature, and if the air outlet temperature T1 is outside the threshold range (Tb-Ta) of the preset air return temperature, the inlet temperature Tin is adjusted through a PID control mode, wherein the PID control mode is as follows: and defining the difference between the preset air outlet temperature and the current actually measured air outlet temperature as an error F (t) at the current moment (t moment), wherein the error at the t-1 moment is F (t-1), the error at the t-2 moment is F (t-1), and the error at the t-3 moment is F (t-3). The inlet temperature of the end heat exchanger 70 at the present time (time t) is Tin (t), and the inlet temperature of the end heat exchanger 70 at time t-1 is Tin (t-1). Kp is the proportional regulating coefficient of the inlet temperature Tin, Ki is the integral regulating coefficient of the inlet temperature Tin, Kd is the differential regulating coefficient of the inlet temperature Tin, and the corresponding PID regulating equation is as follows:
Tin(t)＝Kp*F(t)+Ki*[F(t)+F(t-1)+F(t-2)+F(t-3)]+Kd*[F(t)-F(t-1)]。
it should be noted that, the preset return air temperature and the preset outlet air temperature that are set in this embodiment are set by the user, and the user can set different preset return air temperatures and preset outlet air temperatures according to the self condition, so as to improve the user experience.
As shown in fig. 7, the second aspect of the present invention further provides a control device 700 of an air conditioning system 100 corresponding to the first aspect of the present invention, where the control device 700 is configured to execute the control method of the air conditioning system 100 according to the first aspect of the present invention, and the control device 700 includes: an obtaining module 710, configured to obtain an outlet air temperature of the end heat exchanger 70 and a return air temperature at the fan 80; and the control module 720 is configured to control the inlet temperature of the terminal heat exchanger 70 to perform adaptive adjustment until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
According to an embodiment of the invention, the control module 720 is further configured to: the inlet water quantity of the end heat exchanger 70 is controlled by controlling the opening degree of the inlet valve 71 and the opening degree of the bypass valve 72, so that the inlet temperature is adjusted.
According to an embodiment of the invention, the control module 720 is further configured to: the inlet temperature of the end heat exchanger 70 is controlled according to the PID control mode to make adaptive adjustment until the return air temperature is within the threshold range of the preset return air temperature: tin (t) ═ Kp E (t) + Ki [ E (t) + E (t-1) + E (t-2) + E (t-3) ] + Kd [ E (t) -E (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
According to an embodiment of the invention, the control module 720 is further configured to: adjusting the inlet temperature of the terminal heat exchanger 70 according to a PID control manner to perform adaptive adjustment until the outlet air temperature is within the threshold range of the preset outlet air temperature: tin (t) ═ kpf (t) + Ki [ F (t) + F (t-1) + F (t-2) + F (t-3) ] + Kd [ F (t) -F (t-1) ], tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the air outlet temperature monitored at the moment t and the preset air outlet temperature, F (t-1) is the difference value of the air outlet temperature monitored at the moment t-1 and the preset air outlet temperature, F (t-2) is the difference value of the air outlet temperature monitored at the moment t-2 and the preset air outlet temperature, and F (t-3) is the difference value of the air outlet temperature monitored at the moment t-3 and the preset air outlet temperature.
According to an embodiment of the invention, the control module 720 is further configured to: the return air temperature is controlled to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and is in a change state.
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 700 (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. A control method of an air conditioning system is characterized in that the air conditioning system comprises an outer machine system composed of a refrigerant loop, the air conditioning system further comprises a plurality of inner machine systems in thermal contact with the outer machine system, each inner machine system comprises a tail end heat exchanger and a fan arranged close to the tail end heat exchanger, and the control method comprises the following steps:
acquiring the air outlet temperature of the tail end heat exchanger and the return air temperature of the fan;
and controlling the inlet temperature of the terminal heat exchanger to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
2. The method for controlling an air conditioning system according to claim 1, wherein the air conditioning system further comprises a water inlet valve disposed at an inlet end of the end heat exchanger and a bypass valve communicating the inlet end with a return end of the end heat exchanger, the method comprising:
the water inflow of the tail end heat exchanger is controlled by controlling the opening degree of the water inlet valve and the opening degree of the bypass valve, so that the purpose of adjusting the inlet temperature is achieved.
3. The control method of an air conditioning system according to claim 1, characterized by further comprising:
controlling the inlet temperature of the tail end heat exchanger to be adaptively adjusted according to a PID control mode until the return air temperature is within the threshold range of the preset return air temperature:
Tin(t)＝Kp*E(t)+Ki*[E(t)+E(t-1)+E(t-2)+E(t-3)]+Kd*[E(t)-E(t-1)]，
tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
4. The control method of an air conditioning system according to claim 1, characterized by further comprising:
adjusting the inlet temperature of the tail end heat exchanger according to a PID control mode to perform adaptive adjustment until the outlet air temperature is within the threshold range of the preset outlet air temperature:
Tin(t)＝Kp*F(t)+Ki*[F(t)+F(t-1)+F(t-2)+F(t-3)]+Kd*[F(t)-F(t-1)]，
tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the air outlet temperature monitored at the moment t and the preset air outlet temperature, F (t-1) is the difference value of the air outlet temperature monitored at the moment t-1 and the preset air outlet temperature, F (t-2) is the difference value of the air outlet temperature monitored at the moment t-2 and the preset air outlet temperature, and F (t-3) is the difference value of the air outlet temperature monitored at the moment t-3 and the preset air outlet temperature.
5. The control method of an air conditioning system according to claim 1, characterized by further comprising:
and controlling the return air temperature to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and the return air temperature is in a change state.
6. A control device of an air conditioning system, wherein the air conditioning system includes an outer unit system composed of a refrigerant circuit, the air conditioning system further includes a plurality of inner unit systems in thermal contact with the outer unit system, each of the inner unit systems includes a terminal heat exchanger and a fan disposed near the terminal heat exchanger, the control device is configured to perform the control method of the air conditioning system according to any one of claims 1 to 5, and the control device includes:
the acquisition module is used for acquiring the air outlet temperature of the tail end heat exchanger and the return air temperature of the fan;
and the control module is used for controlling the inlet temperature of the terminal heat exchanger to be adaptively adjusted until the return air temperature is within the threshold range of the preset return air temperature or the outlet air temperature is within the threshold range of the preset outlet air temperature according to the fact that the return air temperature is outside the threshold range of the preset return air temperature and the outlet air temperature is outside the threshold range of the preset outlet air temperature.
7. The control device of an air conditioning system according to claim 6, further comprising a water inlet valve provided at an inlet end of the end heat exchanger and a bypass valve communicating the inlet end with a return end of the end heat exchanger,
the control module is further configured to: the water inflow of the tail end heat exchanger is controlled by controlling the opening degree of the water inlet valve and the opening degree of the bypass valve, so that the purpose of adjusting the inlet temperature is achieved.
8. The control device of an air conditioning system of claim 1, wherein the control module is further configured to:
controlling the inlet temperature of the tail end heat exchanger to be adaptively adjusted according to a PID control mode until the return air temperature is within the threshold range of the preset return air temperature:
Tin(t)＝Kp*E(t)+Ki*[E(t)+E(t-1)+E(t-2)+E(t-3)]+Kd*[E(t)-E(t-1)]，
tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, E (t) is the difference value of the return air temperature monitored at the moment t and the preset return air temperature, E (t-1) is the difference value of the return air temperature monitored at the moment t-1 and the preset return air temperature, E (t-2) is the difference value of the return air temperature monitored at the moment t-2 and the preset return air temperature, and E (t-3) is the difference value of the return air temperature monitored at the moment t-3 and the preset return air temperature.
9. The control device of a laundry processing apparatus according to claim 1, wherein the control module is further configured to:
adjusting the inlet temperature of the tail end heat exchanger according to a PID control mode to perform adaptive adjustment until the outlet air temperature is within the threshold range of the preset outlet air temperature:
Tin(t)＝Kp*F(t)+Ki*[F(t)+F(t-1)+F(t-2)+F(t-3)]+Kd*[F(t)-F(t-1)]，
tin (t) is the inlet temperature monitored at the moment t, Kp is the proportional regulating coefficient of the inlet temperature, Ki is the integral regulating coefficient of the inlet temperature, Kd is the differential regulating coefficient of the inlet temperature, F (t) is the difference value of the air outlet temperature monitored at the moment t and the preset air outlet temperature, F (t-1) is the difference value of the air outlet temperature monitored at the moment t-1 and the preset air outlet temperature, F (t-2) is the difference value of the air outlet temperature monitored at the moment t-2 and the preset air outlet temperature, and F (t-3) is the difference value of the air outlet temperature monitored at the moment t-3 and the preset air outlet temperature.
10. The control device of an air conditioning system of claim 1, wherein the control module is further configured to:
and controlling the return air temperature to change in a preset change interval by adjusting the inlet temperature according to the fact that the return air temperature is within the threshold range of the preset return air temperature and the return air temperature is in a change state.
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 comprising an outer machine system and a plurality of inner machine systems in thermal contact with the outer machine system,
the outdoor unit system comprises a refrigerant loop, wherein the refrigerant loop is formed by sequentially connecting a compressor, a first heat exchanger, a throttling device and a second heat exchanger;
the indoor unit system comprises a water heat exchanger, a tail end heat exchanger and a fan, 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 valve and an inlet temperature sensor are arranged at the inlet end of the tail end heat exchanger, a bypass valve is arranged between the inlet end and the return end of the tail end heat exchanger, the fan is arranged at a position close to the tail end heat exchanger, and an air outlet temperature sensor and an air return temperature sensor are arranged at the fan;
a controller electrically connected to the inlet valve, the bypass valve, the inlet temperature sensor, the outlet temperature sensor, and the return air temperature sensor, the controller according to claim 11.
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