Control method and device of multi-connected system, multi-connected system and storage medium

Abstract

The application provides a control method and device of a multi-connected system, the multi-connected system and a storage medium, the control method comprises the following steps: obtaining a current operation mode of the multi-connected system after the multi-connected system is powered on and started; obtaining an actual demand capacity of an indoor unit and an actual demand capacity of hot water heating; controlling the opening and closing states of a four-way valve, an outdoor unit throttling device, a first switching device, a second switching device, N indoor unit throttling devices and a hot water throttling device according to the current operation mode, the actual demand capacity of the indoor unit and the actual demand capacity of hot water heating; wherein the opening and closing states of the four-way valve comprise power-on and power-off; the opening and closing states of the first switching device and the second switching device comprise opening and closing; and the opening and closing states of the outdoor unit throttling device, the indoor unit throttling device and the hot water throttling device comprise a throttling mode, a full opening mode and a full closing mode. The application solves the technical problem that the multi-connected system cannot adjust the capacity output in the refrigeration+hot water heating mode and meets the customer demand.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a control method for a multi-split air conditioning system, a control device for a multi-split air conditioning system, a multi-split air conditioning system, and a readable storage medium. Background Technology

[0002] Multi-split air conditioners, as a type of air conditioning system, consist of indoor and outdoor units. Compared to fixed-split units, they can meet the air conditioning requirements of larger spaces, such as office buildings and large shopping malls, by stacking the capacity of the outdoor units. Therefore, the research and improvement of multi-split air conditioner technology has received close attention from society. Currently, researchers in multi-split air conditioners have conducted a lot of optimization work, mainly focusing on the selection of refrigerants, optimization of multi-split unit structure, and optimization of operation control strategies.

[0003] Currently, many multi-split systems with hot water production functions have emerged. The water in the water heater can be heated by the waste heat released by the multi-split system. During the day, the multi-split system heats and stores the water, and then uses the hot water at night. This can reduce the impact of environmental changes on the unit, improve energy efficiency, and reduce energy supply pressure and people's living expenses.

[0004] However, in actual use, there is a problem: in the cooling + hot water mode, the outdoor heat exchanger of the multi-split system is always a condenser and cannot adjust the capacity output to meet customer needs. Summary of the Invention

[0005] This invention solves the technical problem that in multi-split air conditioning systems, the outdoor heat exchanger always functions as a condenser in cooling + hot water mode, making it impossible to adjust the capacity output and meet customer needs.

[0006] To address the aforementioned problems, this invention provides a control method for a multi-split air conditioning system. The multi-split system includes an air conditioning system and a hot water system. The air conditioning system includes a refrigerant circulation pipeline, a compressor, a four-way valve, an outdoor heat exchanger, an outdoor unit throttling device, an indoor unit, a first switching device, and a second switching device. The compressor, four-way valve, outdoor heat exchanger, outdoor unit throttling device, indoor unit, and first switching device are all connected to the refrigerant circulation pipeline. One end of the second switching device is connected to the refrigerant circulation pipeline and is located between the indoor unit and the first switching device; the other end is connected to the four-way valve. The indoor unit includes N indoor heat exchangers and N indoor unit throttling devices, where N is a positive integer. The hot water system has a first end and a second end; the first end is connected between the compressor and the four-way valve, and the second end is connected to the indoor unit. Between the first switching device and the hot water system, the hot water system includes a hot water throttling device and a hot water heat exchanger; the control method includes: after the multi-split system is powered on and started, obtaining the current operating mode of the multi-split system; obtaining the actual demand capacity of the indoor unit and the actual demand capacity of hot water production; and controlling the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switching device, the second switching device, N indoor unit throttling devices, and the hot water throttling device according to the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of hot water production; wherein, the opening and closing states of the four-way valve include: energized and de-energized; the opening and closing states of the first switching device and the second switching device include: open and closed; and the opening and closing states of the outdoor unit throttling device, the indoor unit throttling device, and the hot water throttling device include: throttling mode, fully open mode, and fully closed mode.

[0007] Compared with existing technologies, the technical effects achieved by this solution are as follows: By setting up a valve group, namely a four-way valve, a first switching device, and a second switching device, the high and low pressure switching of the outdoor heat exchanger in the multi-split system in the cooling + hot water mode can be realized. The actual demand capacity of the indoor unit and the actual demand capacity of the hot water production can reflect the cooling load demand of the indoor unit and the domestic hot water load demand. The outdoor heat exchanger is adjusted to condense or evaporate, thereby making up for the problem of insufficient evaporation or condensation when the cooling + hot water load changes, thus improving the user experience.

[0008] In one embodiment of the present invention, the current operating mode includes: a cooling + hot water mode and a heating + hot water mode; based on the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity for hot water, the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switch device, the second switch device, N indoor unit throttling devices, and the hot water throttling device are controlled, including: when the current operating mode is cooling + hot water mode, based on the actual demand capacity of the indoor unit and the actual demand capacity for hot water, controlling the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switch device, the second switch device, N indoor unit throttling devices, and the hot water throttling device; and / or when the current operating mode is heating + hot water mode, controlling the four-way valve to be energized, the outdoor unit throttling device to be in throttling mode, the indoor unit throttling device and the hot water throttling device to be in fully open mode, the first switch device to be closed, and the second switch device to be open.

[0009] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the current operating mode of the multi-split system is heating + hot water production, the heat from the multi-split system will be released through the indoor heat exchanger and the hot water heat exchanger. At this time, the four-way valve is energized, the outdoor unit's throttling device is in throttling mode, and the indoor unit's throttling device and the hot water throttling device are in fully open mode. The first switch is closed, and the second switch is open. At this time, the outdoor heat exchanger acts as an evaporator. The high-temperature and high-pressure refrigerant discharged from the compressor's exhaust port reaches the four-way valve and is divided into two paths at the four-way valve: the first path flows through the second switch and then through the indoor unit's throttling device and the indoor heat exchanger; the second path flows through the hot water heat exchanger and the hot water throttling device. The refrigerant after passing through the first and second paths respectively then flows through the modular radiator, the outdoor unit's throttling device, and the outdoor heat exchanger, finally returning to the compressor's suction port to achieve heating by the indoor heat exchanger.

[0010] In one embodiment of the present invention, when the current operating mode is cooling + hot water production mode, the opening and closing states of the four-way valve, outdoor unit throttling device, first switching device, second switching device, N indoor unit throttling devices, and hot water throttling device are controlled according to the actual demand capacity of the indoor unit and the actual demand capacity of hot water production. This includes: when the current operating mode is cooling + hot water production mode, obtaining the actual demand difference based on the actual demand capacity of the indoor unit and the actual demand capacity of hot water production, where the actual demand difference = actual demand capacity of the indoor unit - actual demand capacity of hot water production; and controlling the opening and closing states of the four-way valve, outdoor unit throttling device, first switching device, second switching device, N indoor unit throttling devices, and hot water throttling device according to the actual demand difference, a first capacity preset value, and a second capacity preset value. The opening and closing states of the switching device, the second switching device, the N indoor unit throttling devices, and the hot water throttling device; when the actual demand difference is less than or equal to the first capacity preset value, the four-way valve is energized, the outdoor unit throttling device and the indoor unit throttling device are in throttling mode, the hot water throttling device is in fully open mode, the first switching device is turned on, and the second switching device is turned off; and / or when the actual demand difference is greater than or equal to the second capacity preset value, the four-way valve is de-energized, the outdoor unit throttling device and the hot water throttling device are in fully open mode, the indoor unit throttling device is in throttling mode, the first switching device is turned on, and the second switching device is turned off; wherein, the first capacity preset value is less than the second capacity preset value.

[0011] Compared with existing technologies, the technical effects achieved by this solution are as follows: the actual required capacity of the indoor unit can represent the actual refrigerant capacity required by the air conditioning system, and the actual required capacity for hot water production can represent the actual refrigerant capacity required by the hot water production system. When the current operating mode of the multi-split system is cooling + hot water production, the cooling and hot water capacity requirements of the air conditioning system can be obtained by comparing the values ​​between the actual required capacity of the indoor unit and the actual required capacity for hot water production. The difference between the actual required capacity of the indoor unit and the actual required capacity for hot water production is used to determine the cooling and hot water capacity requirements of the air conditioning system. The opening and closing states of the four-way valve, outdoor unit throttling device, first switch device, second switch device, N indoor unit throttling devices, and hot water throttling device are controlled based on this difference, thereby realizing the switching of the evaporation / condensation function of the outdoor heat exchanger, coping with load changes in the cooling + hot water production mode, and improving the user experience. A first and second capacity preset value are introduced, with the first capacity preset value being less than the second capacity preset value. This further distinguishes the cooling + hot water production mode into cooling + hot water production-evaporator mode, cooling + hot water production-condenser mode, and cooling + hot water production-energy-saving mode.

[0012] In one embodiment of the present invention, the air conditioning system further includes a modular radiator, which is connected to an external circulating water system via a cooling water flow path. The modular radiator is connected to a refrigerant circulation pipeline and is located between the outdoor unit throttling device and the indoor unit. Based on the actual demand difference, a first capacity preset value, and a second capacity preset value, the system controls the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switch device, the second switch device, N indoor unit throttling devices, and the hot water throttling device. The system further includes: when the actual demand difference is greater than or equal to the first capacity preset value and less than or equal to the second capacity preset value, controlling the four-way valve to de-energize, the outdoor unit throttling device to be in a fully closed mode, the hot water throttling device to be in a fully open mode, the indoor unit throttling device to be in a throttling mode, the first switch device to be turned on, and the second switch device to be turned off; activating the cooling water flow path to connect the external circulating water system and the modular radiator.

[0013] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the difference between actual demand and actual demand is greater than or equal to the first preset capacity value and less than or equal to the second preset capacity value, the cooling capacity demand and the hot water capacity demand are close. At this time, based on the operation of the cooling + hot water - condensing mode, the outdoor unit throttling device is closed, so that the outdoor heat exchanger is in the closed state (i.e., no refrigerant passes through the outdoor heat exchanger, and the outdoor heat exchanger fan is stopped). At this time, the multi-split system operates in the cooling + hot water - energy-saving mode, using all the unit's cooling waste heat for hot water production, realizing waste heat recovery; and the cooling water flow path of the modular radiator is activated, connecting the external circulating water system and the modular radiator so that the modular radiator can cool the electronic control device in the multi-split system.

[0014] In one embodiment of the present invention, obtaining the actual required capacity of the indoor unit and the actual required capacity for hot water production includes: obtaining the outer ring temperature, the inner ring temperature, the first ambient temperature, the inner ring set temperature, and the rated capacity of the indoor unit; calculating the actual required capacity of the indoor unit according to the outer ring temperature, the inner ring temperature, the first ambient temperature, the inner ring set temperature, and the rated capacity of the indoor unit as Formula 1; Formula 1: ΣQcj=[Σ((T1-Toi)*α+(T2-Tii)*β)*Qci]; where ΣQcj is the actual required capacity of the indoor unit, T1 is the first ambient temperature, Toi is the outer ring temperature, T2 is the inner ring set temperature, Tii is the inner ring temperature, Qci is the rated capacity of the indoor unit; α is the first correction coefficient, and β is the second correction coefficient.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: The cooling / heating capacity of the indoor heat exchanger changes with variations in the outer and inner ring temperatures. Therefore, the actual required capacity of the indoor unit is related to both the outer and inner ring temperatures. The actual required capacity of the indoor unit is calculated as follows: ΣQcj=[Σ((T1-Toi)*α+(T2-Tii)*β)*Qci], where ΣQcj is the actual required capacity of the indoor unit, T1 is the first ambient temperature, Toi is the outer ring temperature, T2 is the inner ring set temperature, Tii is the inner ring temperature, and Qci is the rated capacity of the indoor unit; α is the first correction coefficient, and β is the second correction coefficient. The first ambient temperature is the standard ambient temperature, as detailed in GB / T 18837 Rated Cooling Ambient Temperature.

[0016] In one embodiment of the present invention, the hot water system further includes a water tank, which is connected to a hot water heat exchanger via heat exchange pipes; obtaining the actual required capacity of the indoor unit and the actual required capacity of hot water production also includes: obtaining the water tank temperature, the water tank set temperature, and the rated hot water production capacity; calculating the actual required capacity of hot water production according to the water tank temperature, the water tank set temperature, and the rated hot water production capacity as Formula 2; Formula 2: ΣQwj=[Σ(Tw0-Twi)*γ*Qwi]; where ΣQwj is the actual required capacity of hot water production, Twi is the water tank temperature, Tw0 is the water tank set temperature, Qwi is the rated hot water production capacity; and γ is a third correction coefficient.

[0017] Compared with existing technologies, the technical effects achieved by this solution are as follows: The hot water production capacity of the hot water system changes with variations in the water tank temperature and its set temperature. Therefore, the actual hot water production capacity is related to the water tank temperature and its set temperature. The actual hot water production capacity is calculated as: ΣQwj=[Σ(Tw0-Twi)*γ*Qwi], where ΣQwj is the actual hot water production capacity, Twi is the water tank temperature, Tw0 is the water tank set temperature, Qwi is the rated hot water production capacity, and γ is the third correction coefficient. The water tank temperature can also be replaced with other set values ​​such as the underfloor heating outlet temperature or return water temperature.

[0018] On the other hand, embodiments of the present invention also provide a control device for a multi-split air conditioning system, the multi-split air conditioning system including: an air conditioning system and a hot water system; the air conditioning system includes a refrigerant circulation pipeline, a compressor, a four-way valve, an outdoor heat exchanger, an outdoor unit throttling device, an indoor unit, a first switching device and a second switching device, wherein the compressor, the four-way valve, the outdoor heat exchanger, the outdoor unit throttling device, the indoor unit and the first switching device are all connected to the refrigerant circulation pipeline; one end of the second switching device is connected to the refrigerant circulation pipeline and is located between the indoor unit and the first switching device, and the other end is connected to the four-way valve; the indoor unit includes N indoor heat exchangers and N indoor unit throttling devices, where N is a positive integer; the hot water system has a first end and a second end, the first end being connected to the compressor and the four-way valve. Between the valves, the second end is connected between the indoor unit and the first switching device. The hot water system includes a hot water throttling device and a hot water heat exchanger. The control device uses the control method of a multi-split system as described in any embodiment of the present invention. The control device includes: a first acquisition module, which is used to acquire the current operating mode of the multi-split system after it is powered on and started; a second acquisition module, which is used to acquire the actual demand capacity of the indoor unit and the actual demand capacity of hot water production; and a control module, which is used to control the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switching device, the second switching device, the N indoor unit throttling devices, and the hot water throttling device according to the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of hot water production.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: The control device of the multi-split air conditioning system in this embodiment is used to implement the control method of the multi-split air conditioning system as in any embodiment of the present invention, and therefore it has all the beneficial effects of the control method of the multi-split air conditioning system as in any embodiment of the present invention, which will not be repeated here.

[0020] In another aspect, embodiments of the present invention also provide a multi-unit system, the multi-unit system including: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein when the program or instructions are executed by the processor, the steps of the control method of the multi-unit system as described in any of the above embodiments are implemented.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the multi-split air conditioning system in this embodiment operates the control method of the multi-split air conditioning system in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the multi-split air conditioning system in any embodiment of the present invention, which will not be repeated here.

[0022] In another aspect, embodiments of the present invention also provide a readable storage medium storing a program or instructions, which, when executed by a processor, implement the steps of the control method for a multi-unit system as described in any of the above embodiments.

[0023] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The readable storage medium in this embodiment is used to store the control method of the multi-unit system as in any embodiment of the present invention, and therefore it has all the beneficial effects of the control method of the multi-unit system as in any embodiment of the present invention, which will not be repeated here.

[0024] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0025] (1) By setting up a valve group, namely a four-way valve, a first switch device and a second switch device, the high and low pressure switching of the outdoor heat exchanger in the cooling + hot water mode of the multi-split system can be realized. The actual demand capacity of the indoor unit and the actual demand capacity of the hot water can reflect the cooling load demand of the indoor unit and the domestic hot water load demand. The outdoor heat exchanger is adjusted to condense or evaporate, thereby making up for the problem of insufficient evaporation or condensation when the cooling + hot water load changes, and improving the user experience.

[0026] (2) When the difference between actual demand and actual demand is greater than or equal to the first capacity preset value and less than or equal to the second capacity preset value, the cooling calculation capacity demand and the hot water production capacity demand are close. At this time, on the basis of the cooling + hot water production - condensing mode operation, the outdoor unit throttling device is closed, so that the outdoor heat exchanger is in the closed state (i.e. no refrigerant passes through the outdoor heat exchanger and the fan of the outdoor heat exchanger stops). At this time, the operation mode of the multi-split system is cooling + hot water production - energy saving mode, and all the unit's cooling waste heat is used for hot water production to realize waste heat recovery. Attached Figure Description

[0027] Figure 1 A flowchart of a control method for a multi-unit air conditioning system provided in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the multi-unit air conditioning system in Embodiment 1 of the present invention;

[0029] Figure 3 for Figure 2 Refrigerant flow diagram when the operating mode of the multi-split air conditioning system is cooling + hot water production - evaporator mode;

[0030] Figure 4 for Figure 2 Refrigerant flow diagram when the operating mode of the multi-split air conditioning system is cooling + hot water production - condenser mode;

[0031] Figure 5 for Figure 2 Schematic diagram of the connection structure of the middle module heat sink;

[0032] Figure 6 for Figure 2 Refrigerant flow diagram when the multi-split air conditioning system is operating in heating + hot water mode;

[0033] Figure 7 This is a schematic block diagram of the structure of a control device for a multi-unit air conditioning system provided in Embodiment 2 of the present invention;

[0034] Figure 8 This is a block diagram of a multi-unit air conditioning system provided in Embodiment 3 of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of a readable storage medium provided in Embodiment 4 of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Refrigerant circulation piping; 110. Compressor; 120. Four-way valve; 130. Outdoor heat exchanger; 140. Outdoor unit throttling device; 1510. Indoor heat exchanger; 1520. Indoor unit throttling device; 161. First switching device; 162. Second switching device; 171. Hot water heat exchanger; 172. Hot water throttling device; 173. Water tank; 174. Heat exchange piping; 175. First water pump; 180. Modular radiator; 1 81. Cooling water flow path; 182. Second water pump; 191. Oil separator; 192. Check valve; 193. Gas-liquid separator; 200. Control device for multi-split system; 201. First acquisition module; 202. Second acquisition module; 203. Control module; 300. Multi-split system; 310. Memory; 311. Computer program; 320. Processor; 400. Readable storage medium; 410. Computer-executable instructions. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] See Figure 1 This invention provides a control method for a multi-unit air conditioning system, combined with Figures 2-6The multi-split system includes an air conditioning system and a hot water system. The air conditioning system includes a refrigerant circulation line 100, a compressor 110, a four-way valve 120, an outdoor heat exchanger 130, an outdoor unit throttling device 140, an indoor unit, a first switching device 161, and a second switching device 162. The compressor 110, four-way valve 120, outdoor heat exchanger 130, outdoor unit throttling device 140, indoor unit, and first switching device 161 are all connected to the refrigerant circulation line 100. One end of the second switching device 162... The system is connected to the refrigerant circulation pipe 100 and located between the indoor unit and the first switching device 161, with the other end connected to a four-way valve 120; the indoor unit includes N indoor heat exchangers 1510 and N indoor unit throttling devices 1520, where N is a positive integer; the hot water system has a first end and a second end, the first end being connected between the compressor 110 and the four-way valve 120, and the second end being connected between the indoor unit and the first switching device 161; the hot water system includes a hot water throttling device 172 and a hot water heat exchanger 171; the control method includes:

[0041] Step S100: After the multi-split system is powered on and started, obtain the current operating mode of the multi-split system;

[0042] Step S200: Obtain the actual required capacity of the indoor unit and the actual required capacity for hot water production;

[0043] Step S300: Based on the current operating mode, the actual demand capacity of the indoor unit and the actual demand capacity of hot water, control the opening and closing status of the four-way valve 120, the outdoor unit throttling device 140, the first switch device 161, the second switch device 162, the N indoor unit throttling devices 1520 and the hot water throttling device 172.

[0044] The four-way valve 120 has the following opening and closing states: energized and de-energized; the first switch device 161 and the second switch device 162 have the following opening and closing states: open and closed; the outdoor unit throttling device 140, the indoor unit throttling device 1520 and the hot water throttling device 172 have the following opening and closing states: throttling mode, fully open mode and fully closed mode.

[0045] In a specific embodiment, the multi-split air conditioning system according to the present application uses the opening and closing states of the four-way valve 120, the first switching device 161, and the second switching device 162 to switch the evaporation / condensation function of the outdoor heat exchanger 130, responding to load changes in the cooling + hot water mode, adjusting capacity output in a timely manner, and improving the user experience. The multi-split system includes an air conditioning system and a hot water system; the compressor 110 drives the refrigerant to circulate in the refrigerant circulation pipeline 100, and the compressor 110 is connected to the four-way valve 120, the outdoor heat exchanger 130, the outdoor unit throttling device 140, the indoor unit, and the first switching device 161. Since the multi-split system also has a hot water system, which is connected between the compressor 110 and the four-way valve 120, the high-temperature and high-pressure refrigerant discharged from the compressor 110 can also flow to the hot water system. Therefore, the multi-split system can not only exchange heat through the outdoor heat exchanger 130, but also exchange heat with water through the hot water system. The two heat exchange methods increase the heat exchange capacity of the multi-split system, which can reduce the energy consumption of the multi-split outdoor unit caused by the external environment and load, and ensure the user's air conditioning needs while using waste heat to heat the water.

[0046] By setting up a valve group, namely a four-way valve 120, a first switching device 161, and a second switching device 162, the high and low pressure switching of the outdoor heat exchanger 130 in the multi-split system in the cooling + hot water mode can be realized. The actual demand capacity of the indoor unit and the actual demand capacity of the hot water production can reflect the cooling load demand of the indoor unit and the domestic hot water load demand. The outdoor heat exchanger 130 is adjusted to condense or evaporate, thereby making up for the problem of insufficient evaporation or condensation when the cooling + hot water load changes, and improving the user experience.

[0047] The indoor heat exchanger 1510 and the indoor unit throttling device 1520 are in one-to-one correspondence. By controlling the opening and closing state of the indoor unit throttling device 1520, the flow rate and velocity of the refrigerant flowing through the corresponding indoor heat exchanger 1510 are controlled.

[0048] Preferably, the air conditioning system further includes an oil separator 191, a one-way valve 192, and a gas-liquid separator 193. The oil separator 191 is connected to the compressor 110 and the four-way valve 120 through the refrigerant circulation pipeline 100; the one-way valve 192 is connected to the oil separator 191 and the four-way valve 120 through the refrigerant circulation pipeline 100; and the gas-liquid separator 193 is connected to the four-way valve 120 and the compressor 110 through the refrigerant circulation pipeline 100.

[0049] Furthermore, the current operating modes include: cooling + hot water mode, heating + hot water mode; step S300 includes:

[0050] Step S310: When the current operating mode is cooling + hot water production mode, based on the actual demand capacity of the indoor unit and the actual demand capacity of hot water production, control the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switching device 161, the second switching device 162, the N indoor unit throttling devices 1520, and the hot water throttling device 172; and / or

[0051] Step S320: When the current operating mode is heating + hot water mode, the four-way valve 120 is energized, the outdoor unit throttling device 140 is in throttling mode, the indoor unit throttling device 1520 and the hot water throttling device 172 are in fully open mode, the first switch device 161 is closed, and the second switch device 162 is open.

[0052] Specifically, the current operating mode of the multi-split system is either cooling + hot water mode or heating + hot water mode. Cooling + hot water mode means that both the air conditioning system's cooling function and the hot water system's hot water function are activated; heating + hot water mode means that both the air conditioning system's heating function and the hot water system's hot water function are activated.

[0053] In step S300, based on the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity for hot water, the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switching device 161, the second switching device 162, the N indoor unit throttling devices 1520, and the hot water throttling device 172 are controlled, including any of the following control scenarios for the current operating mode:

[0054] The first control scenario is for the current operating mode: When the current operating mode of the multi-split system is cooling + hot water production mode, the outdoor heat exchanger 130 is adjusted to either condense or evaporate according to the actual demand capacity of the indoor unit and the actual demand capacity of the hot water production. Specifically, the type of heat exchanger of the outdoor heat exchanger 130 is controlled by controlling the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switch device 161, the second switch device 162, the N indoor unit throttling devices 1520, and the hot water throttling device 172, which means controlling whether the outdoor heat exchanger 130 releases or absorbs heat.

[0055] The second control scenario is based on the current operating mode: When the multi-split system's current operating mode is heating + hot water production, the heat from the multi-split system will be released through the indoor heat exchanger 1510 and the hot water heat exchanger 171. At this time, the four-way valve 120 is energized, the outdoor unit throttling device 140 is in throttling mode, and the indoor unit throttling device 1520 and the hot water throttling device 172 are in fully open mode. The first switch 161 is closed, and the second switch 162 is open. At this time, the outdoor heat exchanger 130 acts as an evaporator. The specific refrigerant flow diagram is as follows: Figure 6As shown: The high-temperature, high-pressure refrigerant discharged from the compressor 110 reaches the four-way valve 120, where it is divided into two paths: the first path flows through the second switching device 162, then through the indoor unit throttling device 1520 and the indoor heat exchanger 1510; the second path flows through the hot water heat exchanger 171 and the hot water throttling device 172. The refrigerant after passing through the first and second paths then flows through the modular radiator 180, the outdoor unit throttling device 140, and the outdoor heat exchanger 130, finally returning to the compressor 110's suction port to achieve heating in the indoor heat exchanger 1510. Preferably, the indoor unit throttling device 1520 and the hot water throttling device 172 are theoretically in a fully open mode, but in practice, the opening degree can be controlled according to specific circumstances (e.g., in the case of subcooling adjustment and / or protection adjustment).

[0056] Furthermore, step S310 includes:

[0057] Step S311: When the current operating mode is cooling + hot water mode, obtain the actual demand difference based on the actual demand capacity of the indoor unit and the actual demand capacity of hot water. Actual demand difference = actual demand capacity of indoor unit - actual demand capacity of hot water.

[0058] Step S312: Based on the actual demand difference, the first capacity preset value, and the second capacity preset value, control the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switch device 161, the second switch device 162, the N indoor unit throttling devices 1520, and the hot water throttling device 172.

[0059] When the difference between actual demand and pre-set capacity is less than or equal to the first capacity preset value, the four-way valve 120 is energized, the outdoor unit throttling device 140 and the indoor unit throttling device 1520 are in throttling mode, the hot water throttling device 172 is in fully open mode, the first switch 161 is turned on, and the second switch 162 is turned off; and / or

[0060] When the difference between actual demand and actual demand is greater than or equal to the second capacity preset value, the four-way valve 120 is de-energized, the outdoor unit throttling device 140 and the hot water throttling device 172 are in full-open mode, the indoor unit throttling device 1520 is in throttling mode, the first switch device 161 is turned on, and the second switch device 162 is turned off.

[0061] Among them, the preset value of the first capability is less than the preset value of the second capability.

[0062] Specifically, the actual required capacity of the indoor unit represents the actual refrigerant capacity needed by the air conditioning system, and the actual required capacity for hot water production represents the actual refrigerant capacity needed by the hot water production system. When the multi-split system is currently operating in cooling + hot water production mode, by comparing the values ​​of the actual required capacity of the indoor unit and the actual required capacity for hot water production, the cooling and hot water production capacity requirements of the air conditioning system can be obtained.

[0063] The cooling and hot water production capacity requirements of the air conditioning system are determined by the difference between the actual required capacity of the indoor unit and the actual required capacity for hot water production. Specifically, the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switching device 161, the second switching device 162, N indoor unit throttling devices 1520, and the hot water throttling device 172 are controlled by ∆ΣQj. This allows for the switching of the outdoor heat exchanger 130 between evaporation and condensation functions, adapting to load changes in the cooling + hot water production mode and improving the user experience. Here, ∆ΣQj represents the actual demand difference, ∆ΣQj=ΣQcj-ΣQwj, which is the difference between the actual required capacity of the indoor unit and the actual required capacity for hot water production.

[0064] Introducing a first capacity preset value Q1 and a second capacity preset value Q2, where Q1 < Q2, the cooling + hot water mode is further divided into cooling + hot water - evaporator mode, cooling + hot water - condenser mode, and cooling + hot water - energy-saving mode. When ∆ΣQj≤Q1, that is, when the difference in actual demand is less than or equal to the first capacity preset value, the calculated cooling capacity demand is less than the hot water capacity demand, resulting in insufficient evaporation. Therefore, the four-way valve 120 is energized, the outdoor unit throttling device 140 and the indoor unit throttling device 1520 are in throttling mode, the hot water throttling device 172 is in fully open mode, the first switch device 161 is turned on, and the second switch device 162 is turned off, switching the outdoor heat exchanger 130 to an evaporator (at this time, the multi-split system operates in cooling + hot water - evaporator mode); the specific refrigerant flow diagram is as follows. Figure 3 As shown: The high-temperature, high-pressure refrigerant discharged from the compressor 110 exhaust port passes sequentially through the four-way valve 120, the hot water heat exchanger 171, and the hot water throttling device 172. After passing through the hot water throttling device 172, it splits into two paths: the first path passes through the modular radiator 180, the outdoor unit throttling device 140, and the outdoor heat exchanger 130; the second path passes through the indoor unit throttling device 1520, the indoor heat exchanger 1510, and the first switch device 161. The refrigerant after passing through the first and second paths respectively finally returns to the compressor 110 suction port. Preferably, the hot water throttling device 172 is theoretically in a fully open mode, but in practice, the opening degree can be controlled according to specific circumstances (e.g., in the case of subcooling adjustment and / or protection adjustment).

[0065] When ∆ΣQj≥Q2, meaning the difference between actual and pre-set demand is greater than or equal to the second capacity preset value, the calculated cooling capacity demand exceeds the hot water capacity demand, resulting in insufficient condensation. Therefore, the four-way valve 120 is de-energized, the outdoor unit throttling device 140 and the hot water throttling device 172 are fully open, the indoor unit throttling device 1520 is in throttling mode, the first switch 161 is opened, and the second switch 162 is closed, switching the outdoor heat exchanger 130 to a condenser (at this time, the multi-split system operates in cooling + hot water - condenser mode); the specific refrigerant flow diagram is as follows: Figure 4 As shown: The high-temperature, high-pressure refrigerant discharged from the compressor 110 reaches the four-way valve 120, where it is divided into two paths: the first path passes through the outdoor heat exchanger 130, the outdoor unit throttling device 140, and the modular radiator 180; the second path passes through the hot water heat exchanger 171 and the hot water throttling device 172. The refrigerant from both paths then flows through the indoor unit throttling device 1520, the indoor heat exchanger 1510, and the first switching device 161, finally returning to the compressor 110's suction port to achieve heating in the indoor heat exchanger 1510. Preferably, the outdoor unit throttling device 140 and the hot water throttling device 172 are theoretically in a fully open mode, but in practice, the opening degree can be controlled according to specific circumstances (e.g., in the case of subcooling adjustment and / or protection adjustment).

[0066] Preferably, the preferred value of the first capability preset value is 1, and the preferred value of the second capability preset value is 2.

[0067] Furthermore, the air conditioning system also includes a modular radiator 180, which is connected to the external circulating water system through a cooling water flow path 181. The modular radiator 180 is connected to the refrigerant circulation pipeline 100 and is located between the outdoor unit throttling device 140 and the indoor unit.

[0068] Based on the actual demand difference, the first capacity preset value, and the second capacity preset value, the system controls the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switching device 161, the second switching device 162, N indoor unit throttling devices 1520, and the hot water throttling device 172, and also includes:

[0069] When the difference between actual demand and actual demand is greater than or equal to the first preset capacity value and less than or equal to the second preset capacity value, the four-way valve 120 is de-energized, the outdoor unit throttling device 140 is in the fully closed mode, the hot water throttling device 172 is in the fully open mode, the indoor unit throttling device 1520 is in the throttling mode, the first switch device 161 is turned on, and the second switch device 162 is turned off.

[0070] Start the cooling water flow path 181 to connect the external circulating water system and the module radiator 180.

[0071] Specifically, when Q1≤∆ΣQj≤Q2, that is, when the difference in actual demand is greater than or equal to the first preset capacity value and less than or equal to the second preset capacity value, the cooling capacity demand and the hot water capacity demand are close. At this time, based on the cooling + hot water - condensing mode operation, the outdoor unit throttling device 140 is closed, keeping the outdoor heat exchanger 130 in a closed state (i.e., no refrigerant flows through the outdoor heat exchanger 130, and the fan of the outdoor heat exchanger 130 stops). At this time, the multi-split system operates in a cooling + hot water - energy-saving mode, using all the unit's cooling waste heat for hot water production, achieving waste heat recovery. Figure 5 As shown, the cooling water flow path 181 of the module radiator 180 is activated, connecting the external circulating water system and the module radiator 180 so that the module radiator 180 can cool the electronic control devices in the multi-split system. The makeup water (i.e., the external circulating water system) can come from the water tank circulating water or from the hydraulic module circulating water.

[0072] Furthermore, obtaining the actual required capacity of the indoor unit and the actual required capacity for hot water production includes:

[0073] Obtain the outer ring temperature, inner ring temperature, first ambient temperature, inner ring set temperature, and indoor unit rated capacity;

[0074] Based on the outer ring temperature, inner ring temperature, first ambient temperature, inner ring set temperature and indoor unit rated capacity, the actual required capacity of the indoor unit is calculated as formula 1.

[0075] Formula 1: ΣQcj=[Σ((T1-Toi)*α+(T2-Tii)*β)*Qci];

[0076] Where ΣQcj is the actual required capacity of the indoor unit, T1 is the first ambient temperature, Toi is the outer ring temperature, T2 is the inner ring set temperature, Tii is the inner ring temperature, Qci is the rated capacity of the indoor unit; α is the first correction coefficient, and β is the second correction coefficient.

[0077] Specifically, the cooling / heating capacity of the indoor heat exchanger 1510 changes with the changes in the outer and inner ring temperatures. Therefore, the actual required capacity of the indoor unit is related to both the outer and inner ring temperatures. The actual required capacity of the indoor unit is calculated as follows: ΣQcj=[Σ((T1-Toi)*α+(T2-Tii)*β)*Qci], where ΣQcj is the actual required capacity of the indoor unit, T1 is the first ambient temperature, Toi is the outer ring temperature, T2 is the inner ring set temperature, Tii is the inner ring temperature, Qci is the rated capacity of the indoor unit, α is the first correction coefficient, and β is the second correction coefficient. The first ambient temperature is the standard ambient temperature; refer to GB / T 18837 Rated Cooling Ambient Temperature for details.

[0078] Furthermore, the hot water system also includes a water tank 173, which is connected to the hot water heat exchanger 171 via a heat exchange pipe 174.

[0079] Obtaining the actual required capacity of the indoor unit and the actual required capacity for hot water production also includes:

[0080] Obtain the water tank temperature, the set water tank temperature, and the rated hot water production capacity;

[0081] Based on the water tank temperature, the water tank set temperature, and the rated hot water production capacity, the actual hot water production capacity is calculated using Formula 2.

[0082] Formula 2: ΣQwj=[Σ(Tw0-Twi)*γ*Qwi];

[0083] Where ΣQwj is the actual hot water demand capacity, Twi is the water tank temperature, Tw0 is the water tank set temperature, Qwi is the rated hot water production capacity, and γ is the third correction coefficient.

[0084] Specifically, the hot water production capacity of the hot water system will change as the water tank temperature and the set water tank temperature change. Therefore, the actual hot water production capacity is related to the water tank temperature and the set water tank temperature. The actual hot water production capacity is calculated as: ΣQwj=[Σ(Tw0-Twi)*γ*Qwi], where ΣQwj is the actual hot water production capacity, Twi is the water tank temperature, Tw0 is the set water tank temperature, Qwi is the rated hot water production capacity, and γ is the third correction coefficient. The water tank temperature can also be replaced with other set values ​​such as the underfloor heating outlet temperature or return water temperature.

[0085] Preferably, α, β, and γ are correction coefficients, ranging from [0, 1], which are adjusted according to the configuration of the outdoor unit, with high-configuration units tending towards 0 and low-configuration units tending towards 1.

[0086]

Example 2

[0087] See Figure 7This embodiment also provides a control device 200 for a multi-split system. The multi-split system includes an air conditioning system and a hot water system. The air conditioning system includes a refrigerant circulation pipeline 100, a compressor 110, a four-way valve 120, an outdoor heat exchanger 130, an outdoor unit throttling device 140, an indoor unit, a first switching device 161, and a second switching device 162. The compressor 110, four-way valve 120, outdoor heat exchanger 130, outdoor unit throttling device 140, indoor unit, and first switching device 161 are all connected to the refrigerant circulation pipeline 100. One end of the second switching device 162 is connected to the refrigerant circulation pipeline 100 and is located between the indoor unit and the first switching device 161; the other end is connected to the four-way valve 120. The indoor unit includes N indoor heat exchangers 1510 and N indoor unit throttling devices 1520, where N is a positive integer. The hot water system has a first terminal and a second terminal. One end is connected between the compressor 110 and the four-way valve 120, and the second end is connected between the indoor unit and the first switch device 161. The hot water system includes a hot water throttling device 172 and a hot water heat exchanger 171. The control device 200 of the multi-split system includes: a first acquisition module 201, which is used to acquire the current operating mode of the multi-split system after it is powered on and started; a second acquisition module 202, which is used to acquire the actual demand capacity of the indoor unit and the actual demand capacity of hot water production; and a control module 203, which is used to control the opening and closing states of the four-way valve 120, the outdoor unit throttling device 140, the first switch device 161, the second switch device 162, the N indoor unit throttling devices 1520, and the hot water throttling device 172 according to the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of hot water production.

[0088] In one specific embodiment, the first acquisition module 201, the second acquisition module 202, and the control module 203 of the control device 200 of the multi-split air conditioning system cooperate to implement the control method of the multi-split air conditioning system as described in the first embodiment above, which will not be repeated here.

[0089]

Example 3

[0090] See Figure 8 This embodiment provides a schematic diagram of the structure of a multi-unit system 300. The multi-unit system 300 includes, for example, a processor 320 and a memory 310 electrically connected to the processor 320. The memory 310 stores a computer program 311. The processor 320 loads the computer program 311 to implement the control method of the multi-unit system as described in the first embodiment.

[0091]

Example 4

[0092] See Figure 9This embodiment also provides a readable storage medium 400, which stores computer-executable instructions 410. When the computer-executable instructions 410 are read and run by the processor, the multi-unit system 300 where the readable storage medium 400 is located is controlled to implement the control method of the multi-unit system as described in the first embodiment.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0094] If the functionality is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a multi-unit air conditioning system, characterized in that, The multi-split system includes an air conditioning system and a hot water system; the air conditioning system includes a refrigerant circulation pipeline (100), a compressor (110), a four-way valve (120), an outdoor heat exchanger (130), an outdoor unit throttling device (140), an indoor unit, a first switching device (161), and a second switching device (162), wherein the compressor (110), the four-way valve (120), the outdoor heat exchanger (130), the outdoor unit throttling device (140), the indoor unit, and the first switching device (161) are all connected to the refrigerant circulation pipeline (100); one end of the second switching device (162) is connected to the refrigerant circulation pipeline (100) and is located between the indoor unit and the first switching device (161), and the other end is connected to the four-way valve (120); the indoor unit includes N units. The system includes an indoor heat exchanger (1510) and N indoor unit throttling devices (1520), where N is a positive integer. The hot water system has a first end and a second end. The first end is connected between the compressor (110) and the four-way valve (120), and the second end is connected between the indoor unit and the first switching device (161). The hot water system includes a hot water throttling device (172) and a hot water heat exchanger (171). The air conditioning system also includes a gas-liquid separator (193), which is connected to the four-way valve (120) and the compressor (110) through a refrigerant circulation pipeline (100). One end of the first switching device (161) is located on the refrigerant circulation pipeline (100) between the four-way valve (120) and the gas-liquid separator (193), and the other end is connected to the indoor unit. The control method includes: After the multi-split air conditioning system is powered on and started, the current operating mode of the multi-split air conditioning system is obtained; Obtain the actual required capacity of the indoor unit and the actual required capacity for hot water production; Based on the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of hot water production, control the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switch device (161), the second switch device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172). The opening and closing states of the four-way valve (120) include: energized and de-energized; the opening and closing states of the first switch device (161) and the second switch device (162) include: open and closed; the opening and closing states of the outdoor unit throttling device (140), the indoor unit throttling device (1520) and the hot water throttling device (172) include: throttling mode, fully open mode and fully closed mode.

2. The control method according to claim 1, characterized in that, The current operating modes include: cooling + hot water production mode and heating + hot water production mode; The method of controlling the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switching device (161), the second switching device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172) according to the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of hot water production includes: When the current operating mode is cooling + hot water production mode, the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switching device (161), the second switching device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172) are controlled according to the actual demand capacity of the indoor unit and the actual demand capacity of the hot water production; and / or When the current operating mode is heating + hot water mode, the four-way valve (120) is energized, the outdoor unit throttling device (140) is in the throttling mode, the indoor unit throttling device (1520) and the hot water throttling device (172) are in the fully open mode, the first switch device (161) is closed, and the second switch device (162) is open.

3. The control method according to claim 2, characterized in that, When the current operating mode is cooling + hot water production mode, the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switching device (161), the second switching device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172) are controlled according to the actual demand capacity of the indoor unit and the actual demand capacity of the hot water, including: When the current operating mode is cooling + hot water production mode, the actual demand difference is obtained based on the actual demand capacity of the indoor unit and the actual demand capacity of the hot water production. The actual demand difference = actual demand capacity of the indoor unit - actual demand capacity of the hot water production. Based on the actual demand difference, the first capacity preset value, and the second capacity preset value, control the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switch device (161), the second switch device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172); When the difference between the actual demand and the actual demand is less than or equal to the first preset capacity value, the four-way valve (120) is energized, the outdoor unit throttling device (140) and the indoor unit throttling device (1520) are in the throttling mode, the hot water throttling device (172) is in the fully open mode, the first switch (161) is turned on, and the second switch (162) is turned off; and / or When the difference between the actual demand and the second capacity preset value is greater than or equal to the actual demand, the four-way valve (120) is de-energized, the outdoor unit throttling device (140) and the hot water throttling device (172) are in the fully open mode, the indoor unit throttling device (1520) is in the throttling mode, the first switch (161) is turned on, and the second switch (162) is turned off. Wherein, the first capability preset value is less than the second capability preset value.

4. The control method according to claim 3, characterized in that, The air conditioning system also includes a modular radiator (180), which is connected to an external circulating water system through a cooling water flow path (181). The modular radiator (180) is connected to the refrigerant circulation pipeline (100) and is located between the outdoor unit throttling device (140) and the indoor unit. The method of controlling the opening and closing states of the four-way valve (120), the outdoor unit throttling device (140), the first switching device (161), the second switching device (162), N indoor unit throttling devices (1520), and the hot water throttling device (172) based on the actual demand difference, the first capacity preset value, and the second capacity preset value, further includes: When the difference between the actual demand and the first capacity preset value is greater than or equal to the second capacity preset value, the four-way valve (120) is de-energized, the outdoor unit throttling device (140) is in the fully closed mode, the hot water throttling device (172) is in the fully open mode, the indoor unit throttling device (1520) is in the throttling mode, the first switch device (161) is turned on, and the second switch device (162) is turned off. Start the cooling water flow path (181) to connect the external circulating water system and the module radiator (180).

5. The control method according to claim 1, characterized in that, The process of obtaining the actual required capacity of the indoor unit and the actual required capacity for hot water production includes: Obtain the outer ring temperature, inner ring temperature, first ambient temperature, inner ring set temperature, and indoor unit rated capacity; Based on the outer ring temperature, the inner ring temperature, the first ambient temperature, the inner ring set temperature, and the rated capacity of the indoor unit, the actual required capacity of the indoor unit is calculated as Formula 1. ΣQcj=[Σ((T1-Toi) α+(T2-Ti) β) Qci] Wherein, ΣQcj is the actual required capacity of the indoor unit, T1 is the first ambient temperature, Toi is the outer ring temperature, T2 is the inner ring set temperature, Tii is the inner ring temperature, Qci is the rated capacity of the indoor unit; α is the first correction coefficient, and β is the second correction coefficient.

6. The control method according to claim 1, characterized in that, The hot water system also includes a water tank (173), which is connected to the hot water heat exchanger (171) via a heat exchange pipe (174); The process of obtaining the actual required capacity of the indoor unit and the actual required capacity for hot water production also includes: Obtain the water tank temperature, the set water tank temperature, and the rated hot water production capacity; Based on the water tank temperature, the water tank set temperature, and the rated hot water production capacity, the actual hot water production capacity is calculated as formula 2. Formula 2: ΣQwj = [Σ(Tw0 - Twi) γ Qwi]; Wherein, ΣQwj is the actual required capacity for hot water production, Twi is the water tank temperature, Tw0 is the set temperature of the water tank, Qwi is the rated capacity for hot water production, and γ is the third correction coefficient.

7. A control device for a multi-unit air conditioning system, characterized in that, The multi-split system includes an air conditioning system and a hot water system; the air conditioning system includes a refrigerant circulation pipeline (100), a compressor (110), a four-way valve (120), an outdoor heat exchanger (130), an outdoor unit throttling device (140), an indoor unit, a first switching device (161), and a second switching device (162), wherein the compressor (110), the four-way valve (120), the outdoor heat exchanger (130), the outdoor unit throttling device (140), the indoor unit, and the first switching device (161) are all connected to the refrigerant circulation pipeline (100); the second switching device (162) One end of the device is connected to the refrigerant circulation pipe (100) and located between the indoor unit and the first switch device (161), and the other end is connected to the four-way valve (120); the indoor unit includes N indoor heat exchangers (1510) and N indoor unit throttling devices (1520), where N is a positive integer; the hot water system has a first end and a second end, the first end is connected between the compressor (110) and the four-way valve (120), and the second end is connected between the indoor unit and the first switch device (161); the hot water system includes a hot water throttling device (172) and a hot water heat exchanger (171); The control device applies the control method for a multi-unit air conditioning system as described in any one of claims 1 to 6, and the control device comprises: The first acquisition module is used to acquire the current operating mode of the multi-split air conditioning system after the multi-split air conditioning system is powered on and started. The second acquisition module is used to acquire the actual required capacity of the indoor unit and the actual required capacity for hot water production. The control module is used to control the opening and closing states of the four-way valve, the outdoor unit throttling device, the first switch device, the second switch device, N indoor unit throttling devices, and the hot water throttling device according to the current operating mode, the actual demand capacity of the indoor unit, and the actual demand capacity of the hot water production.

8. A multi-split air conditioning system, characterized in that, The multi-unit system includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the control method for the multi-unit system as described in any one of claims 1 to 6.

9. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method for a multi-unit system as described in any one of claims 1 to 6.

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