CN113405243A - Control method of air conditioning system - Google Patents
Control method of air conditioning system Download PDFInfo
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- CN113405243A CN113405243A CN202010182558.1A CN202010182558A CN113405243A CN 113405243 A CN113405243 A CN 113405243A CN 202010182558 A CN202010182558 A CN 202010182558A CN 113405243 A CN113405243 A CN 113405243A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000003507 refrigerant Substances 0.000 claims abstract description 152
- 238000004781 supercooling Methods 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims description 168
- 238000001816 cooling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000004836 empirical method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010257 thawing 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
- F24F11/62—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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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- 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
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an air conditioning system. According to the invention, the actual supercooling value of the air conditioning system is calculated based on the acquired actual pressure value and actual temperature value of the refrigerant at the second end of the outdoor heat exchanger during refrigeration or the acquired actual pressure value and actual temperature value of the refrigerant at the first end of the indoor heat exchanger during heating, then the actual supercooling value is compared with the preset target supercooling value, and the refrigerant quantity participating in circulation in the air conditioning system is selectively controlled based on the comparison result, so that the aim of flexibly adjusting the refrigerant quantity participating in circulation in the air conditioning system can be more efficiently realized, and the operating efficiency of the air conditioning system is more reliably improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an air conditioning system.
Background
In the refrigerant circulation process of the air conditioning system, when the outdoor heat exchanger is used as a condenser and the indoor heat exchanger is used as an evaporator, the indoor air conditioning system can refrigerate the indoor air; when the indoor heat exchanger is used as a condenser and the outdoor heat exchanger is used as an evaporator, the indoor heat exchanger can be used for heating the indoor space.
The existing air conditioning system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator, an electronic expansion valve and a liquid storage tank, wherein a refrigerant outlet end of the compressor is connected to a first end of the four-way reversing valve, a cold inlet end of the compressor is connected to a third end of the four-way reversing valve through the gas-liquid separator, the first end of the outdoor heat exchanger is connected with a second end of the four-way reversing valve, the electronic expansion valve and the liquid storage tank are connected to a refrigerant pipeline between the second end of the outdoor heat exchanger and the first end of the indoor heat exchanger, and the second end of the indoor heat exchanger is connected with a fourth end of the four-way reversing valve. During cooling, the flow path of the refrigerant of the air conditioning system is as follows: compressor → four-way reversing valve → outdoor heat exchanger → electronic expansion valve → liquid storage tank → indoor heat exchanger → four-way reversing valve → gas-liquid separator → compressor; in heating, the refrigerant flow path of the air conditioning system is: compressor → four-way reversing valve → indoor heat exchanger → electronic expansion valve → liquid storage tank → outdoor heat exchanger → four-way reversing valve → gas-liquid separator → compressor.
However, the control capability of the liquid storage tank to the amount of the refrigerant participating in the circulation in the existing air conditioning system is limited, and the refrigerant can only be stored when the air conditioning system is used for cooling and heating, but the amount of the refrigerant participating in the circulation cannot be flexibly adjusted, so that the operation efficiency of the air conditioning system is limited. For example, the refrigerant volume involved in the circulation is too large, which causes problems such as too high condensing pressure, large increase in power consumption of the compressor, and too much intake liquid. If the quantity of the refrigerant participating in the circulation is too small, the problems of low operation pressure (generally, pressure on a pipeline between an evaporator and a compressor) of the air conditioning system and the like can occur, and the cooling or heating effect of the air conditioning system can be reduced.
Accordingly, there is a need in the art for a new control method of an air conditioning system to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the liquid storage tank of the existing air conditioning system cannot flexibly adjust the amount of refrigerant participating in circulation, thereby limiting the operation efficiency of the air conditioning system, the invention provides a control method of the air conditioning system, the air conditioning system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator, an electronic expansion valve and a liquid storage tank, the refrigerant outlet end of the compressor is connected with the first end of the four-way reversing valve, the refrigerant inlet end of the compressor is connected with the third end of the four-way reversing valve through the gas-liquid separator, the first end of the outdoor heat exchanger is connected with the second end of the four-way reversing valve, the electronic expansion valve is connected on a refrigerant pipeline between the second end of the outdoor heat exchanger and the first end of the indoor heat exchanger, the second end of the indoor heat exchanger is connected with the fourth end of the four-way reversing valve; the refrigerant inlet end of the liquid storage tank is connected between the electronic expansion valve and the outdoor heat exchanger through a first liquid inlet pipe; the refrigerant inlet end of the liquid storage tank is connected between the electronic expansion valve and the indoor heat exchanger through a second liquid inlet pipe; the refrigerant outlet end of the liquid storage tank is connected between the electronic expansion valve and the outdoor heat exchanger through a first liquid discharge pipe; and the refrigerant outlet end of the liquid storage tank is connected between the electronic expansion valve and the indoor heat exchanger through a second liquid discharge pipe, and the control method comprises the following steps: acquiring an actual pressure value and an actual temperature value of a refrigerant at a second end of the outdoor heat exchanger during refrigeration; or acquiring an actual pressure value and an actual temperature value of a refrigerant at the first end of the indoor heat exchanger during heating; calculating an actual subcooling value of the air conditioning system based on the actual pressure value and the actual temperature value; and comparing the actual supercooling value with a preset target supercooling value, and selectively controlling the quantity of the refrigerant participating in circulation in the air conditioning system based on the comparison result.
As a preferable technical solution of the above control method provided by the present invention, the step of "calculating the actual subcooling value of the air conditioning system based on the actual pressure value and the actual temperature value" includes: determining the saturation temperature value of the refrigerant corresponding to the actual pressure value; and calculating the difference value between the saturation temperature value and the actual temperature value, and taking the difference value as the actual supercooling value.
As a preferable aspect of the control method provided by the present invention, the method for determining the target supercooling degree value includes: the method comprises the steps of obtaining an actual outdoor environment temperature value during heating, and determining a target supercooling value based on the actual outdoor environment temperature value and a preset corresponding relation between the outdoor environment temperature value during heating and the target supercooling value. Preferably, each of the preset corresponding relations between the outdoor environment temperature value and the target supercooling value includes an outdoor environment temperature value range and a target supercooling value corresponding thereto.
As a preferable aspect of the control method provided by the present invention, the method for determining the target supercooling degree value includes: and acquiring an actual indoor environment temperature value during refrigeration, and determining the target supercooling value based on the actual indoor environment temperature value and a preset corresponding relation between the indoor environment temperature value during refrigeration and the target supercooling value. Preferably, each of the preset corresponding relations between the indoor environment temperature value and the target supercooling value includes an indoor environment temperature value range and a target supercooling value corresponding thereto.
As a preferable aspect of the control method according to the present invention, the step of selectively controlling an amount of refrigerant circulating in the air conditioning system based on the comparison result includes: if the actual supercooling value is smaller than the target supercooling value, increasing the quantity of the refrigerant participating in circulation in the air conditioning system; and/or if the actual supercooling value is greater than the target supercooling value, reducing the refrigerant quantity participating in circulation in the air conditioning system; and/or if the actual supercooling value is equal to the target supercooling value, keeping the refrigerant quantity participating in circulation in the air conditioning system unchanged.
As a preferable technical solution of the control method provided in the present invention, the method of increasing the amount of refrigerant participating in circulation in the air conditioning system includes: when heating, the first liquid discharge pipe is controlled to be communicated, and the first liquid inlet pipe, the second liquid inlet pipe and the second liquid discharge pipe are controlled to be cut off; and/or the second liquid discharge pipe is controlled to be communicated and the first liquid inlet pipe, the second liquid inlet pipe and the first liquid discharge pipe are controlled to be cut off during refrigeration.
As a preferable aspect of the control method provided in the present invention, the method of reducing the amount of refrigerant participating in circulation in the air conditioning system includes: when heating, the second liquid inlet pipe is controlled to be conducted, and the first liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe are controlled to be cut off; and/or the first liquid inlet pipe is controlled to be communicated and the second liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe are controlled to be cut off during refrigeration.
As a preferable aspect of the control method according to the present invention, the method of maintaining a constant amount of refrigerant circulating in the air conditioning system includes: and controlling the first liquid inlet pipe, the second liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe to be cut off.
According to the control method of the air conditioning system, when the quantity of the refrigerant participating in circulation is excessive, the first liquid inlet pipe or the second liquid inlet pipe is conducted to reduce the quantity of the refrigerant participating in circulation so as to reduce the condensation pressure and reduce the power consumption of the compressor. When the quantity of the refrigerant participating in the circulation is too small, the first liquid discharge pipe or the second liquid discharge pipe is conducted to increase the quantity of the refrigerant participating in the circulation so as to increase the pressure of the system, and therefore the refrigerating or heating effect of the air conditioning system is guaranteed. Therefore, the aim of flexibly adjusting the quantity of the refrigerant participating in circulation in the air conditioning system by controlling the conduction and the cut-off of the first liquid inlet pipe, the second liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe is fulfilled.
In addition, according to the air conditioning system control method, the actual supercooling value of the air conditioning system is calculated based on the acquired actual pressure value and actual temperature value of the refrigerant at the second end of the outdoor heat exchanger during refrigeration or the acquired actual pressure value and actual temperature value of the refrigerant at the first end of the indoor heat exchanger during heating, then the actual supercooling value is compared with the preset target supercooling value, and the refrigerant quantity participating in circulation in the air conditioning system is selectively controlled based on the comparison result, so that the aim of flexibly adjusting the refrigerant quantity participating in circulation in the air conditioning system can be fulfilled more efficiently, and the operating efficiency of the air conditioning system is improved more reliably.
Drawings
A control method of an air conditioning system of the present invention is described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic structural diagram of an air conditioning system according to the present embodiment;
fig. 2 is a flowchart illustrating a control method of the air conditioning system according to the present embodiment.
List of reference numerals
1-a compressor; a 2-four-way reversing valve; 3-an outdoor heat exchanger; 31-a first temperature sensor; 32-a first pressure sensor; 33-an outdoor fan; 4-indoor heat exchanger; 41-a second pressure sensor; 42-a second temperature sensor; 5-a gas-liquid separator; 6-electronic expansion valve; 7-a liquid storage tank; 81-a first liquid inlet pipe; 82-a second liquid inlet pipe; 83-a first drain pipe; 84-a second drain pipe; 91-a first on-off valve; 92-a second on-off valve; 93-a third shutoff valve; 94-a fourth shut-off valve; 95-a first one-way valve; 96-a second one-way valve; 97-third check valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present embodiment is exemplarily described with respect to the corresponding relationship between the outdoor environment temperature value and the target supercooling value, and the corresponding relationship between the indoor environment temperature value and the target supercooling value is a specific numerical value, the corresponding relationship is not constant, and for different air conditioner models, a person skilled in the art may adjust the numerical value thereof according to needs so as to adapt to specific application situations.
It should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, this embodiment provides an air conditioning system, as shown in fig. 1, the air conditioning system includes a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, an indoor heat exchanger 4, a gas-liquid separator 5, an electronic expansion valve 6, and a liquid storage tank 7, a refrigerant outlet end of the compressor 1 is connected to a first end (left end in fig. 1) of the four-way reversing valve 2, a refrigerant inlet end of the compressor 1 is connected to a third end (right end in fig. 1) of the four-way reversing valve 2 through the gas-liquid separator 5, a first end of the outdoor heat exchanger 3 is connected to a second end (upper end in fig. 1) of the four-way reversing valve 2, the electronic expansion valve 6 is connected to a refrigerant pipe between the second end of the outdoor heat exchanger 3 and the first end of the indoor heat exchanger 4, and a second end of the indoor heat exchanger 4 is connected to a fourth end (lower end in fig. 1) of the four-way reversing valve 2; the refrigerant inlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the outdoor heat exchanger 3 through a first liquid inlet pipe 81; and the refrigerant inlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the indoor heat exchanger 4 through a second liquid inlet pipe 82; the refrigerant outlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the outdoor heat exchanger 3 through a first liquid discharge pipe 83; and the refrigerant outlet end of the reservoir tank 7 is connected between the electronic expansion valve 6 and the indoor heat exchanger 4 through a second liquid discharge pipe 84.
Illustratively, the general operating principle of the air conditioning system provided by the present embodiment is as follows:
1) when the air conditioning system is refrigerating
The first end and the second end (the left end and the upper end in the figure 1) of the four-way valve are conducted, the third end and the fourth end of the four-way valve are conducted (the right end and the lower end in the figure 1), the air conditioning system is in a refrigeration state, and a circulation line of a refrigerant of the air conditioning system during refrigeration is generally as follows: compressor 1 → four-way selector valve 2 → outdoor heat exchanger 3 → electronic expansion valve 6 → indoor heat exchanger 4 → four-way selector valve 2 → gas-liquid separator 5 → compressor 1.
2) When the air conditioning system heats
The first end and the fourth end of the four-way valve are conducted (the left end and the lower end in fig. 1), and the second end and the third end of the four-way valve are conducted (the upper end and the right end in fig. 1), so that the air-conditioning system is in a heating state, and a circulation line of a refrigerant of the air-conditioning system is generally as follows: compressor 1 → four-way reversing valve 2 → indoor heat exchanger 4 → electronic expansion valve 6 → outdoor heat exchanger 3 → four-way reversing valve 2 → gas-liquid separator 5 → compressor 1.
In the air conditioning system provided by this embodiment, the refrigerant inlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the outdoor heat exchanger 3 through the first liquid inlet pipe 81; and the refrigerant inlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the indoor heat exchanger 4 through a second liquid inlet pipe 82; the refrigerant outlet end of the liquid storage tank 7 is connected between the electronic expansion valve 6 and the outdoor heat exchanger 3 through a first liquid discharge pipe 83; and the refrigerant outlet end of the reservoir tank 7 is connected between the electronic expansion valve 6 and the indoor heat exchanger 4 through a second liquid discharge pipe 84. When the amount of the refrigerant involved in the circulation is excessive, the amount of the refrigerant involved in the circulation may be reduced by conducting the first liquid inlet pipe 81 or the second liquid inlet pipe 82 to reduce the condensation pressure, and the power consumption of the compressor 1 may be reduced. When the amount of refrigerant participating in the circulation is too small, the first drain pipe 83 or the second drain pipe 84 may be conducted to increase the amount of refrigerant participating in the circulation to increase the system pressure, thereby ensuring the cooling or heating effect of the air conditioning system. Therefore, the aim of flexibly adjusting the circulating refrigerant quantity in the air conditioning system by controlling the opening and closing of the first liquid inlet pipe 81, the second liquid inlet pipe 82, the first liquid discharge pipe 83 and the second liquid discharge pipe 84 is fulfilled. Hereinafter, a detailed description will be given of a specific control method of the air conditioning system.
As a preferred embodiment of the air conditioning system provided in this embodiment, the air conditioning system further includes a first on-off valve 91, a second on-off valve 92, a third on-off valve 93, and a fourth on-off valve 94; the first on-off valve 91 is connected to the first liquid inlet pipe 81, the second on-off valve 92 is connected to the second liquid inlet pipe 82, the third on-off valve 93 is connected to the first drain pipe 83, and the fourth on-off valve 94 is connected to the second drain pipe 84.
For example, the first, second, third and fourth on-off valves 91, 92, 93 and 94 may be selected from solenoid valves or other valves as long as the opening and closing of the corresponding pipelines can be achieved.
As a preferred embodiment of the air conditioning system provided in this embodiment, the air conditioning system further includes a first check valve 95, a second check valve 96, and a third check valve 97; the first check valve 95 is configured to allow only the refrigerant to flow from the refrigerant outlet end of the compressor 1 to the four-way selector valve 2; the second check valve 96 is set to only allow the refrigerant to flow from the first liquid inlet pipe 81 and/or the second liquid inlet pipe 82 to the liquid storage tank 7; the third check valve 97 is provided to allow the refrigerant to flow only from the reservoir 7 to the first drain pipe 83 and/or the second drain pipe 84.
Illustratively, the first check valve 95 is configured to allow only the refrigerant to flow from the refrigerant outlet end of the compressor 1 to the four-way reversing valve 2, so as to prevent the refrigerant from flowing back to the compressor 1 to damage the compressor 1 when the refrigerant outlet pressure of the compressor 1 is reduced due to shutdown of the compressor 1 or other conditions.
The air conditioning system can only have one second one-way valve 96, one end of the second one-way valve 96 can be connected with the refrigerant inlet of the liquid storage tank 7, and the other end is respectively connected with the first liquid inlet pipe 81 and the second liquid inlet pipe 82 through a three-way pipe; the air conditioning system can also be provided with two second one-way valves 96, the first liquid inlet pipe 81 and the second liquid inlet pipe 82 are respectively connected with one second one-way valve 96, and the two second one-way valves 96 can be connected with the refrigerant inlet of the liquid storage tank 7 through a three-way pipe; alternatively, the air conditioning system includes two second check valves 96; one of the second check valves 96 is used to connect one refrigerant inlet of the liquid storage tank 7 with the first liquid inlet pipe 81, and the other second check valve 96 is used to connect the other refrigerant inlet of the liquid storage tank 7 with the second liquid inlet pipe 82, as shown in the air conditioning system in fig. 1.
The connection manner of the third check valve 97 and the liquid storage tank 7, the first liquid discharge pipe 83 and/or the second liquid discharge pipe 84 please refer to the description of the second check valve 96, which will not be described herein. Wherein the air conditioning system of fig. 1 includes a third check valve 97; the inlet end of the third check valve 97 is connected to the refrigerant outlet of the liquid storage tank 7, and the outlet end of the third check valve 97 is connected with the first liquid discharge pipe 83 and the second liquid discharge pipe 83 through a three-way pipe.
As a preferred embodiment of the air conditioning system provided in this embodiment, the air conditioning system further includes a first pressure sensor 32 and a first temperature sensor 31, and the first pressure sensor 32 and the first temperature sensor 31 are disposed at the second end of the outdoor heat exchanger 3.
For example, the first pressure sensor 32 and the first temperature sensor 31 may measure an actual pressure value and an actual temperature value of the refrigerant at the second end of the outdoor heat exchanger 3, and in this embodiment, the actual pressure value and the actual temperature value of the refrigerant outlet of the outdoor heat exchanger 3 during the refrigeration are mainly obtained to provide a basis for adjusting the amount of the refrigerant participating in the circulation during the refrigeration.
As a preferred embodiment of the air conditioning system provided in this embodiment, the air conditioning system further includes a second pressure sensor 41 and a second temperature sensor 42, and the second pressure sensor 41 and the second temperature sensor 42 are disposed at the first end of the indoor heat exchanger 4.
For example, the second pressure sensor 41 and the second temperature sensor 42 may measure an actual pressure value and an actual temperature value of the refrigerant at the first end of the indoor heat exchanger 4, and in this embodiment, the actual pressure value and the actual temperature value of the refrigerant outlet of the indoor heat exchanger 4 during heating are mainly obtained to provide a basis for adjusting the amount of refrigerant participating in the cycle during heating.
As a preferred implementation of the air conditioning system provided in this embodiment, the air conditioning system further includes a water circulation unit; the water circulation unit is arranged such that one side exchanges heat with the indoor heat exchanger 4 and the other side exchanges heat with indoor air. Therefore, fluctuation of heating temperature or refrigerating temperature of the air-conditioning system can be reduced, and cold air or hot air can be continuously provided indoors for a period of time during defrosting, so that the heat exchange effect of the air-conditioning system is ensured.
As a preferred implementation of the air conditioning system provided in this embodiment, the air conditioning system further includes an outdoor fan 33; the outdoor fan 33 is provided to radiate heat to the outdoor heat exchanger 3. The outdoor heat exchanger 3 can be selected as a fin type heat exchanger to increase the heat exchange area between the outdoor heat exchanger 3 and outdoor air and improve the heat exchange effect.
In addition, as shown in fig. 2, the present embodiment further provides a control method for the air conditioning system, including:
s1, acquiring an actual pressure value and an actual temperature value of the refrigerant at the second end of the outdoor heat exchanger 3 during refrigeration; or acquiring an actual pressure value and an actual temperature value of the refrigerant at the first end of the indoor heat exchanger 4 during heating;
s2, calculating an actual supercooling value of the air conditioning system based on the actual pressure value and the actual temperature value;
and S3, comparing the actual supercooling value with a preset target supercooling value, and selectively controlling the quantity of the refrigerant participating in circulation in the air conditioning system based on the comparison result.
For example, the electronic expansion valve 6 may control the refrigerant flow rate in the air conditioning system according to the superheat degree of the air conditioning system during a period of time after the air conditioning system is turned on, and the air conditioning system is in an unstable state, and at this time, if the refrigerant flow rate of the system is adjusted, the desired effect may not be achieved. Therefore, it is preferable to stabilize the system before selectively controlling the amount of refrigerant participating in the circulation of the air conditioning system based on the comparison result between the actual supercooling value and the preset target supercooling value.
The actual pressure value and the actual temperature value of the refrigerant at the second end of the outdoor heat exchanger 3 can be obtained through the first pressure sensor 32 and the first temperature sensor 31; the actual pressure value and the actual temperature value of the refrigerant at the first end of the indoor heat exchanger 4 may also be obtained by the second pressure sensor 41 and the second temperature sensor 42.
In the control method for the air conditioning system, the actual subcooling value of the air conditioning system is calculated based on the obtained actual pressure value and actual temperature value of the refrigerant at the second end of the outdoor heat exchanger 3 (i.e., the outlet end of the refrigerant when used as a condenser) during refrigeration or the obtained actual pressure value and actual temperature value of the refrigerant at the first end of the indoor heat exchanger 4 (i.e., the outlet end of the refrigerant when used as a condenser) during heating, and then the actual subcooling value is compared with the preset target subcooling value, and the refrigerant quantity participating in circulation in the air conditioning system is selectively controlled based on the comparison result, so that the purpose of flexibly adjusting the refrigerant quantity participating in circulation in the air conditioning system can be more efficiently realized, and the operating efficiency of the air conditioning system can be more reliably improved.
As a preferred embodiment of the above control method provided in the present embodiment, the step S2 of "calculating the actual subcooling value of the air conditioning system based on the actual pressure value and the actual temperature value" includes: determining a saturation temperature value of the refrigerant corresponding to the actual pressure value; the difference between the saturation temperature value and the actual temperature value is calculated and taken as the actual subcooling value.
For example, the pressure and saturation temperature of different types of refrigerants have corresponding comparison tables, and the saturation temperature corresponding to the actual pressure value of the refrigerant can be determined by looking up the table. For example, for the same saturation temperature of 31 ℃, the pressure value corresponding to the R22 refrigerant is 1.12Mpa, the pressure value corresponding to the R134A refrigerant is 0.69Mpa, and the pressure value corresponding to the R410A refrigerant is 1.849 Mpa.
As a preferred implementation of the above control method provided in this embodiment, the method for determining the target supercooling degree value in step S3 includes: and acquiring an actual outdoor environment temperature value during heating, and determining a target supercooling value based on the actual outdoor environment temperature value and a preset corresponding relation between the outdoor environment temperature value during heating and the target supercooling value. Preferably, each of the preset corresponding relations between the outdoor environment temperature value and the target supercooling value includes an outdoor environment temperature value range and a target supercooling value corresponding thereto.
As a preferred implementation of the above control method provided in this embodiment, the method for determining the target supercooling degree value in step S3 includes: and acquiring an actual indoor environment temperature value during refrigeration, and determining a target supercooling value based on the actual indoor environment temperature value and a preset corresponding relation between the indoor environment temperature value during refrigeration and the target supercooling value. Preferably, each of the preset corresponding relations between the indoor environment temperature value and the target supercooling value includes an indoor environment temperature value range and a target supercooling value corresponding thereto.
It should be noted that, when the indoor heat exchanger 4 directly exchanges heat with indoor air, the actual indoor ambient temperature value refers to the actual indoor air temperature; when the air conditioning system is a water machine air conditioner, the indoor heat exchanger 4 exchanges heat with one side of the water circulation unit firstly, and the other side of the water circulation unit exchanges heat with indoor air again, and the actual indoor environment temperature value refers to the temperature of the side, where the water circulation unit exchanges heat with the indoor heat exchanger 4.
The corresponding relationship between the outdoor ambient temperature value and the target supercooling value during heating and the corresponding relationship between the indoor ambient temperature value and the target supercooling value during cooling may be different in value according to different models of the air conditioning system, and the specific corresponding relationship may be determined by an empirical or experimental method.
In order to control the amount of refrigerant in the air conditioning system and simultaneously take stability of the air conditioning system into consideration and avoid frequent adjustment of the amount of refrigerant in the air conditioning system, an outdoor environment temperature value within a certain range or an indoor temperature value within a certain range may be made to correspond to the same target subcooling value, as shown in table 1 and table 2, where end points of two adjacent temperature ranges do not coincide, that is, when one temperature range includes the end point, the other temperature range does not include the end point.
TABLE 1 corresponding relationship between outdoor ambient temperature value and target supercooling value
| Outdoor ambient temperature value Range (. degree. C.) | Less than 10 | 10～20 | 2～30 | 30～40 | Greater than 40 |
| Target passingCooling Density value (. degree. C.) | 6 | 7 | 8 | 8 | 6 |
TABLE 2 corresponding relationship between indoor ambient temperature value and target supercooling value
| Indoor ambient temperature value Range (. degree. C.) | Less than 5 | 5～15 | 15～25 | 25～35 | Greater than 35 |
| Target supercooling degree (. degree. C.) | 3 | 4 | 5 | 5 | 4 |
As a preferred embodiment of the control method according to the present embodiment, the step S3 of "selectively controlling the amount of refrigerant circulating in the air conditioning system based on the comparison result" includes: if the actual supercooling value is smaller than the target supercooling value, increasing the quantity of the refrigerant participating in circulation in the air conditioning system; and/or if the actual supercooling value is greater than the target supercooling value, reducing the amount of refrigerant participating in circulation in the air conditioning system; and/or if the actual supercooling value is equal to the target supercooling value, keeping the amount of the refrigerant participating in the circulation of the air conditioning system unchanged. The method specifically comprises the following steps:
1) the method for increasing the refrigerant quantity participating in circulation in the air conditioning system comprises the following steps:
during cooling, the second drain pipe 84 is controlled to be on, and the first liquid inlet pipe 81, the second liquid inlet pipe 82 and the first drain pipe 83 are controlled to be off. At this time, the refrigerant flows from the outdoor heat exchanger 3 to the indoor heat exchanger 4, and since the pressure of the refrigerant is reduced after the refrigerant is throttled by the electronic expansion valve 6, the pressure on the refrigerant pipeline between the electronic expansion valve 6 and the indoor heat exchanger 4 is lower, the pressure in the liquid storage tank is lower than the external environment temperature corresponding to the saturation temperature (except for the extreme low-temperature refrigeration working condition), the refrigerant in the liquid storage tank absorbs heat from the external environment and gradually evaporates, so that the pressure in the liquid storage tank is higher than the pressure in the refrigerant pipeline between the electronic expansion valve 6 and the indoor heat exchanger 4, and the second liquid discharge pipe 84 is conducted to make the refrigerant in the liquid storage tank 7 more easily enter the refrigerant circulation of the air conditioning system.
During heating, the first drain pipe 83 is controlled to be on, and the first liquid inlet pipe 81, the second liquid inlet pipe 82 and the second drain pipe 84 are controlled to be off. At this time, the refrigerant flows from the indoor heat exchanger 4 to the outdoor heat exchanger 3, and since the pressure of the refrigerant throttled by the electronic expansion valve 6 is reduced, the pressure on the refrigerant pipeline between the electronic expansion valve 6 and the outdoor heat exchanger 3 is lower, so the pressure in the liquid storage tank is lower than the external environment temperature corresponding to the saturation temperature, the refrigerant in the liquid storage tank absorbs heat from the external environment and gradually evaporates, the pressure in the liquid storage tank is higher than the pressure in the refrigerant pipeline between the electronic expansion valve 6 and the outdoor heat exchanger 3, and the refrigerant in the liquid storage tank 7 is more easily added into the refrigerant circulation of the air conditioning system by turning on the first liquid discharge pipe 83.
2) The method for reducing the refrigerant quantity participating in circulation in the air conditioning system comprises the following steps:
during cooling, the first liquid inlet pipe 81 is controlled to be connected, and the second liquid inlet pipe 82, the first liquid outlet pipe 83 and the second liquid outlet pipe 84 are controlled to be disconnected. At this time, the refrigerant flows from the outdoor heat exchanger 3 to the indoor heat exchanger 4, the pressure on the refrigerant pipeline between the electronic expansion valve 6 and the outdoor heat exchanger 3 is higher, the pressure in the liquid storage tank is higher than the external environment temperature corresponding to the saturation temperature, the refrigerant in the liquid storage tank is gradually condensed, the pressure in the liquid storage tank is lower than the pressure in the refrigerant pipeline between the electronic expansion valve 6 and the outdoor heat exchanger 3, and the refrigerant participating in circulation in the air conditioning system is more easily added into the liquid storage tank 7 by switching on the first liquid inlet pipe 81.
During heating, the second liquid inlet pipe 82 is controlled to be connected, and the first liquid inlet pipe 81, the first liquid outlet pipe 83 and the second liquid outlet pipe 84 are controlled to be disconnected. At this time, the refrigerant flows from the indoor heat exchanger 4 to the outdoor heat exchanger 3, the pressure on the refrigerant pipeline between the electronic expansion valve 6 and the indoor heat exchanger 4 is higher, the pressure in the liquid storage tank is higher than the external environment temperature corresponding to the saturation temperature, the refrigerant in the liquid storage tank is gradually condensed, the pressure in the liquid storage tank is lower than the pressure in the refrigerant pipeline between the electronic expansion valve 6 and the indoor heat exchanger 4, and the refrigerant participating in circulation in the air conditioning system is more easily added into the liquid storage tank 7 by switching on the second liquid inlet pipe 82.
3) The method for keeping the refrigerant quantity participating in circulation in the air conditioning system unchanged comprises the following steps: the first liquid inlet pipe 81, the second liquid inlet pipe 82, the first liquid outlet pipe 83 and the second liquid outlet pipe 84 are controlled to be cut off, i.e. the refrigerant in the liquid storage tank 7 is not allowed to flow in or out.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
It should be understood by those skilled in the art that the control method of the air conditioning system provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an air conditioning system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator, an electronic expansion valve and a liquid storage tank, wherein a refrigerant outlet end of the compressor is connected to a first end of the four-way reversing valve, a refrigerant inlet end of the compressor is connected to a third end of the four-way reversing valve through the gas-liquid separator, a first end of the outdoor heat exchanger is connected with a second end of the four-way reversing valve, the electronic expansion valve is connected to a refrigerant pipeline between the second end of the outdoor heat exchanger and the first end of the indoor heat exchanger, and a second end of the indoor heat exchanger is connected to a fourth end of the four-way reversing valve; the refrigerant inlet end of the liquid storage tank is connected between the electronic expansion valve and the outdoor heat exchanger through a first liquid inlet pipe; the refrigerant inlet end of the liquid storage tank is connected between the electronic expansion valve and the indoor heat exchanger through a second liquid inlet pipe; the refrigerant outlet end of the liquid storage tank is connected between the electronic expansion valve and the outdoor heat exchanger through a first liquid discharge pipe; and the refrigerant outlet end of the liquid storage tank is connected between the electronic expansion valve and the indoor heat exchanger through a second liquid discharge pipe, and the control method is characterized by comprising the following steps:
acquiring an actual pressure value and an actual temperature value of a refrigerant at a second end of the outdoor heat exchanger during refrigeration; or acquiring an actual pressure value and an actual temperature value of a refrigerant at the first end of the indoor heat exchanger during heating;
calculating an actual subcooling value of the air conditioning system based on the actual pressure value and the actual temperature value;
and comparing the actual supercooling value with a preset target supercooling value, and selectively controlling the quantity of the refrigerant participating in circulation in the air conditioning system based on the comparison result.
2. The control method of claim 1, wherein the step of calculating an actual subcooling value of the air conditioning system based on the actual pressure value and the actual temperature value comprises:
determining the saturation temperature value of the refrigerant corresponding to the actual pressure value;
and calculating the difference value between the saturation temperature value and the actual temperature value, and taking the difference value as the actual supercooling value.
3. The control method of claim 1, wherein the target subcooling value is determined by:
the method comprises the steps of obtaining an actual outdoor environment temperature value during heating, and determining a target supercooling value based on the actual outdoor environment temperature value and a preset corresponding relation between the outdoor environment temperature value and the target supercooling value.
4. The control method according to claim 3, wherein each of the predetermined correspondence relationships between the outdoor ambient temperature value and the target supercooling value includes an outdoor ambient temperature value range and one target supercooling value corresponding thereto.
5. The control method of claim 1, wherein the target subcooling value is determined by:
the method comprises the steps of obtaining an actual indoor environment temperature value during refrigeration, and determining a target supercooling value based on the actual indoor environment temperature value and a preset corresponding relation between the indoor environment temperature value and the target supercooling value.
6. The control method according to claim 5, wherein each of the predetermined correspondence relationships between the indoor ambient temperature value and the target supercooling value includes an indoor ambient temperature value range and one target supercooling value corresponding thereto.
7. The method as claimed in claim 1, wherein the step of selectively controlling the amount of refrigerant circulating in the air conditioning system based on the comparison result comprises:
if the actual supercooling value is smaller than the target supercooling value, increasing the quantity of the refrigerant participating in circulation in the air conditioning system; and/or
If the actual supercooling value is larger than the target supercooling value, reducing the quantity of refrigerant participating in circulation in the air conditioning system; and/or
And if the actual supercooling value is equal to the target supercooling value, keeping the quantity of the refrigerant participating in circulation in the air conditioning system unchanged.
8. The control method according to claim 7, wherein the method of increasing the amount of refrigerant circulating in the air conditioning system comprises:
when heating, the first liquid discharge pipe is controlled to be communicated, and the first liquid inlet pipe, the second liquid inlet pipe and the second liquid discharge pipe are controlled to be cut off;
and/or the second liquid discharge pipe is controlled to be communicated and the first liquid inlet pipe, the second liquid inlet pipe and the first liquid discharge pipe are controlled to be cut off during refrigeration.
9. The control method according to claim 7, wherein the method of reducing the amount of refrigerant circulating in the air conditioning system comprises:
when heating, the second liquid inlet pipe is controlled to be conducted, and the first liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe are controlled to be cut off;
and/or the first liquid inlet pipe is controlled to be communicated and the second liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe are controlled to be cut off during refrigeration.
10. The control method according to claim 7, wherein the method of maintaining the amount of refrigerant participating in the circulation in the air conditioning system constant comprises: and controlling the first liquid inlet pipe, the second liquid inlet pipe, the first liquid discharge pipe and the second liquid discharge pipe to be cut off.
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| PCT/CN2020/102416 WO2021184615A1 (en) | 2020-03-16 | 2020-07-16 | Control method for air conditioning system |
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