Air conditioner control method and apparatus, multi-split air conditioner, and storage medium

Abstract

The present application provides an air conditioner control method and apparatus, a multi-split air conditioner, and a storage medium. According to the present application, when the multi-split air conditioner has a refrigeration requirement and a water heating requirement at the same time, mode determination is performed on the basis of a water tank temperature and a heating energy requirement of a heating water tank, and a total energy requirement of all air conditioner indoor units that are acquired, so as to determine a target heat recovery mode of the multi-split air conditioner, and then communication states between reversing apparatuses and throttling elements are adjusted on the basis of the target heat recovery mode.

Description

Air conditioner control method, device, multi-split air conditioner and storage medium

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202310988387.5 filed on August 7, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of air conditioners, and in particular to an air conditioner control method and device, a multi-split air conditioner, and a storage medium. Background Art

[0004] Multi-split water heaters are generally equipped with several air-conditioning indoor units and one or more hot water modules. The air-conditioning indoor units are used to regulate the temperature in each room, and the hot water modules are used to provide domestic hot water. Since the air-conditioning indoor units and the hot water modules share a heat pump system, when the temperature is high in summer and the air-conditioning indoor units are used for cooling, the hot water production of the hot water modules cannot operate at the same time.

[0005] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art.

[0006] Summary of the Invention

[0007] The main purpose of the present application is to provide an air conditioner control method, device, multi-split air conditioner and storage medium, aiming to solve the technical problem of the prior art multi-split air conditioner in which heating and hot water production are not performed simultaneously.

[0008] To achieve the above-mentioned objectives, the present application provides an air conditioner control method, which is applied to a multi-split air conditioner, the multi-split air conditioner comprising: an outdoor air conditioner, a plurality of indoor air conditioner units, and a hot water module, the outdoor air conditioner being respectively connected to each indoor air conditioner unit and the hot water module, a throttling element being provided between the outdoor air conditioner, each indoor air conditioner unit, and the hot water module, the outdoor air conditioner comprising a compressor, an outdoor heat exchanger, and at least two reversing devices, the indoor air conditioner comprising an indoor heat exchanger, the hot water module comprising a hot water tank, and each reversing device being connected to the compressor for controlling the flow direction of the refrigerant;

[0009] The method comprises the following steps:

[0010] When the air conditioner has both cooling and hot water requirements, obtaining the water tank temperature of the hot water tank, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit;

[0011] determining a target heat recovery mode for the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit;

[0012] The communication states of the reversing devices and the throttling element are adjusted based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

[0013] In one embodiment, the target heat recovery mode includes a partial heat recovery mode, and the water tank temperature includes: the water temperature of the water tank and the middle temperature of the water tank coil;

[0014] The determining of the target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit includes:

[0015] determining whether the water tank water temperature, the middle temperature of the water tank coil, the heating energy demand, and the total energy demand of each air conditioner indoor unit meet a preset heat recovery condition, the preset heat recovery condition comprising at least one of the following conditions: the water tank water temperature is greater than a preset first temperature threshold; the middle temperature of the water tank coil is greater than or equal to a preset coil temperature; a target heating energy demand ratio is greater than or equal to a preset energy demand ratio, the target heating energy demand ratio being the ratio of the total energy demand of each air conditioner indoor unit to the heating energy demand;

[0016] If so, the air conditioner is in partial heat recovery mode.

[0017] In one embodiment, the target heat recovery mode further includes a full heat recovery mode;

[0018] The step of determining the target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit further includes:

[0019] When the water temperature of the water tank is lower than a preset second temperature threshold, the middle temperature of the water tank coil is lower than a preset coil temperature, and the target heating energy demand ratio is lower than a preset energy demand ratio, the air conditioner operates in a full heat recovery mode, and the preset second temperature threshold is lower than the preset first temperature threshold;

[0020] When the water temperature of the water tank is lower than a preset first temperature threshold and greater than or equal to a preset second temperature threshold, the target heat recovery mode is determined according to the heat recovery mode last run.

[0021] When two reversing devices are provided in the air conditioner outdoor unit, the reversing devices include a first reversing device and a second reversing device, the first reversing device being connected to the compressor, the outdoor heat exchanger and the hot water tank respectively, and the second reversing device being connected to the compressor, the indoor heat exchanger and the hot water tank respectively;

[0022] Adjusting the connection state of each reversing device based on the target heat recovery mode includes:

[0023] When the target heat recovery mode is the partial heat recovery mode, the first selection end and the second selection end in the first reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device.

[0024] In one embodiment, the air conditioner control method further includes:

[0025] When the target heat recovery mode is the full heat recovery mode, the second selection end and the third selection end in the first reversing device are connected so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device.

[0026] When three reversing devices are provided in the air conditioner outdoor unit, the reversing devices include a first reversing device, a second reversing device, and a third reversing device, wherein the first reversing device is respectively connected to the compressor and the outdoor heat exchanger, the second reversing device is respectively connected to the compressor and the indoor heat exchanger, and the third reversing device is respectively connected to the compressor and the hot water tank;

[0027] Adjusting the connection state of each reversing device based on the target heat recovery mode also includes:

[0028] When the target heat recovery mode is the partial heat recovery mode, connecting the first gate terminal and the second gate terminal of the first reversing device so that the refrigerant output terminal of the compressor is connected to the refrigerant input terminal of the outdoor heat exchanger;

[0029] The first selection end and the second selection end in the third reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

[0030] In one embodiment, the air conditioner control method further includes:

[0031] When the target heat recovery mode is the full heat recovery mode, the second gate terminal and the third gate terminal of the first reversing device are connected, so that the refrigerant input terminal of the compressor and the refrigerant output terminal of the outdoor heat exchanger are connected through the first reversing device;

[0032] The first selection end and the second selection end in the third reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

[0033] In addition, to achieve the above-mentioned purpose, the present application also proposes an air conditioner control device, the air conditioner control device comprising:

[0034] an acquisition module, configured to acquire the water tank temperature of the hot water tank, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit when the air conditioner has both cooling and hot water requirements;

[0035] a determination module, configured to determine a target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit;

[0036] An adjustment module is used to adjust the communication status of each reversing device and the throttling element based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a multi-split air conditioner, which includes: a memory, a processor, and an air conditioner control program stored on the memory and runnable on the processor, and the air conditioner control program is configured to implement the steps of the air conditioner control method described above.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which an air conditioner control program is stored. When the air conditioner control program is executed by a processor, the steps of the air conditioner control method described above are implemented.

[0039] The present application determines the target heat recovery mode of the multi-split air conditioner by performing mode judgment on the water tank temperature, heating energy requirement and total energy requirement of each air-conditioning indoor unit of the obtained water heating tank when the multi-split air conditioner has both cooling and hot water requirements. Then, the connectivity state of the reversing device and the throttling element is adjusted according to the target heat recovery mode, thereby achieving the purpose of simultaneously operating cooling and hot water by a heat pump system, heating the water tank with the waste heat of air conditioning cooling, avoiding the technical problem of heating and hot water being performed differently at the same time in the prior art multi-split air conditioner, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic structural diagram of a multi-split air conditioner in a hardware operating environment according to an embodiment of the present application;

[0041] FIG2 is a flow chart of a first embodiment of the air conditioner control method of the present application;

[0042] FIG3 is a structural diagram of a multi-split air conditioner with two reversing devices in partial heat recovery mode according to an embodiment of an air conditioner control method of the present application;

[0043] FIG4 is a structural diagram of a multi-split air conditioner with two reversing devices in full heat recovery mode according to an embodiment of an air conditioner control method of the present application;

[0044] FIG5 is a schematic diagram of determining a capacity requirement interval according to an embodiment of the air conditioner control method of the present application;

[0045] FIG6 is a flow chart of a second embodiment of the air conditioner control method of the present application;

[0046] FIG7 is a flow chart of a third embodiment of the air conditioner control method of the present application;

[0047] FIG8 is a flow chart of a fourth embodiment of the air conditioner control method of the present application;

[0048] FIG9 is a structural diagram of a multi-split air conditioner with three reversing devices in partial heat recovery mode according to an embodiment of an air conditioner control method of the present application;

[0049] FIG10 is a structural diagram of a multi-split air conditioner with three reversing devices in partial heat recovery mode according to an embodiment of an air conditioner control method of the present application;

[0050] FIG11 is a structural block diagram of the first embodiment of the air conditioner control device of the present application.

[0051] Description of Figure Numbers:

[0052] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] Refer to Figure 1, which is a schematic diagram of the structure of a multi-split air conditioner in the hardware operating environment involved in the embodiment of the present application.

[0055] As shown in Figure 1, the multi-split air conditioner may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to implement connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art will understand that the structure shown in FIG1 does not constitute a limitation on the multi-split air conditioner, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0057] As shown in FIG. 1 , the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and an air conditioner control program.

[0058] In the multi-split air conditioner shown in Figure 1, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the multi-split air conditioner of the present application can be set in the multi-split air conditioner, and the multi-split air conditioner calls the air conditioner control program stored in the memory 1005 through the processor 1001, and executes the air conditioner control method provided by the embodiment of the present application.

[0059] An embodiment of the present application provides an air conditioner control method. Referring to FIG. 2 , FIG. 2 is a flow chart of a first embodiment of an air conditioner control method of the present application.

[0060] In this embodiment, the air conditioner control method includes the following steps:

[0061] Step S10: When the air conditioner has both cooling and hot water demands, the water tank temperature of the hot water tank, the heating energy demand, and the total energy demand of each air conditioner indoor unit are obtained.

[0062] In one embodiment, the execution subject may be the air conditioner device, which has functions such as data processing, data communication, and program execution. The air conditioner device may be a controller for a multi-split air conditioner. Of course, other devices with similar functions may also be used, and these implementation conditions do not limit this. For ease of explanation, this embodiment uses a controller for a multi-split air conditioner as an example.

[0063] The air conditioner in this embodiment refers to a multi-split air conditioner, which is an external unit connected to multiple internal units, and can simultaneously adjust parameters such as air temperature, humidity, cleanliness and air flow rate in multiple rooms, including but not limited to cooling, heating and fresh air circulation modes.

[0064] The multi-split air conditioner in this embodiment includes an air-conditioning outdoor unit, an air-conditioning indoor unit and a hot water module. The outdoor unit is respectively connected to each air-conditioning indoor unit and the hot water module. The air-conditioning outdoor unit includes: a compressor, an outdoor heat exchanger and at least two reversing devices. The air-conditioning indoor unit includes at least one indoor heat exchanger. A hot water tank is provided at the end of the hot water module. Each reversing device is connected to the compressor and is mainly used to control the flow direction of the refrigerant in the multi-split air conditioner. The reversing device can be a four-way valve or a three-way valve. This embodiment does not impose specific restrictions on this.

[0065] In addition, throttling elements are provided between the air conditioner outdoor unit and each air conditioner indoor unit and the hot water module. The throttling elements include electronic expansion valves and capillaries. In one embodiment, the electronic expansion valve is used as an example for description. The throttling elements between the air conditioner outdoor unit and each air conditioner indoor unit and the hot water module may include a main electronic expansion valve and branch electronic expansion valves corresponding to each air conditioner indoor unit or hot water module. This embodiment does not impose specific limitations on this.

[0066] It can be understood that in the multi-split air conditioner of this embodiment, the structural connection of the multi-split air conditioner of this application is different depending on the number of reversing devices set. In this embodiment, two reversing devices are taken as an example for explanation, wherein the reversing device includes a first reversing device and a second reversing device, and the refrigerant output end of the compressor is connected to the first reversing device and the second reversing device respectively. According to the different heat recovery modes of the multi-split air conditioner, the flow ratio of the refrigerant in the pipeline can be adjusted by the connection of the reversing device.

[0067] For the sake of convenience, the reversing device is a four-way valve as an example. The refrigerant output end of the compressor is connected to the selection end D of the first four-way valve and the second four-way valve respectively, and the refrigerant output end of the compressor is also directly connected to the hot water tank. Referring to Figure 3, in the partial heat recovery mode, the selection end D of the first four-way valve is connected to the selection end C, the selection end S is connected to the selection end E, the selection end D of the second four-way valve is connected to the selection end C, and the selection end S is connected to the selection end E, so that the high-temperature and high-pressure refrigerant can be divided into two paths, one of which is connected through the outdoor heat exchanger. The refrigerant flows through the electronic expansion valve of the main circuit and flows through the indoor heat exchanger for evaporation, completing the cooling of the air conditioner. The other circuit flows directly into the hot water tank through a pipeline and exchanges heat with the hot water tank to make hot water. The branch electronic expansion valve corresponding to the hot water module is used to reduce the pressure and merge with the refrigerant from the main circuit. The branch electronic expansion valve corresponding to the air conditioner flows through the indoor heat exchanger for evaporation, and finally returns to the compressor through the indoor heat exchanger and the second four-way valve, completing the cooling of the air conditioner and the hot water of the hot water tank simultaneously.

[0068] Referring to Figure 4, in the full heat recovery mode, the selection end D of the first four-way valve is connected to the selection end E, the selection end C is connected to the selection end S, and the selection end D of the second four-way valve is connected to the selection end C, and the selection end S is connected to the selection end E, so that the high-temperature and high-pressure refrigerant is all heat-exchanged through the refrigerant pipeline where the water tank is located. After passing through the hot water tank, the refrigerant is divided into two paths through the branch electronic expansion valve corresponding to the hot water module. One path flows through the outdoor heat exchanger through the main electronic expansion valve to evaporate, and returns to the compressor through the first four-way valve. The other path flows through the indoor heat exchanger through the electronic expansion valve of the branch where the air-conditioning indoor unit is located to evaporate, thereby achieving the cooling effect of the air-conditioning indoor unit, and then returns to the compressor through the second four-way valve, thereby simultaneously completing the cooling of the air-conditioning indoor unit and the hot water heating of the hot water tank.

[0069] In one embodiment, since the application scenario of this application is the cooling of the heat pump system in summer, at this time, in order to achieve hot water production, the existing technology generally uses electric heating of the hot water tank, but the electric heating method has high energy consumption and cannot recover the waste heat of the air conditioner.

[0070] It is understood that the water temperature of the hot water tank includes but is not limited to the water temperature in the water tank and the temperature in the middle of the water tank coil, wherein the water tank temperature can be the average of the water temperature at the top of the water tank and the water temperature at the bottom of the water tank, and the temperature in the middle of the water tank coil refers to the refrigerant saturation temperature corresponding to the compressor exhaust pressure. In one embodiment, the refrigerant saturation temperature is related to factors such as the refrigerant type and refrigerant pressure. Its main functions are temperature control, heat exchange, and improving energy efficiency. Considering that there is pressure loss when the refrigerant passes through various heat exchange devices, and there is basically no pressure loss when the refrigerant is transmitted in the pipeline, this embodiment uses the temperature in the middle of the coil of the hot water tank directly connected to the refrigerant output end of the compressor as the refrigerant saturation temperature corresponding to the exhaust pressure.

[0071] It is understandable that the heating energy of the hot water tank needs to be calculated based on the capacity demand coefficient of the hot water tank and the rated capacity of the hot water tank. The calculation formula for the heating energy of the hot water tank is as follows: Q w =H w *A w

[0072] Among them, Q w Refers to the heating energy required by the water heating tank, A w It refers to the capacity requirement coefficient of the hot water tank and is related to the water temperature and the outdoor ambient temperature. w Refers to the rated capacity of the hot water tank.

[0073] It should be understood that obtaining the heating demand of the hot water tank includes: querying the capacity demand coefficient corresponding to the water temperature of the water tank and the outdoor ambient temperature; and calculating the heating energy demand of the hot water tank based on the capacity demand coefficient and the rated capacity of the hot water tank.

[0074] When querying the capacity requirement coefficient corresponding to the water temperature of the water tank and the outdoor ambient temperature, you can refer to Table 1.

[0075] Table 1

[0076] In one embodiment, the rated capacity of the hot water tank is positively correlated with the capacity of the hot water tank. The larger the capacity of the hot water tank, the larger the rated capacity. For example, if the hot water tank is 150L, ​​the corresponding rated capacity of the hot water tank is 2.8KW; if the hot water tank is 200L, the corresponding rated capacity of the hot water tank is 3.6KW. This embodiment does not impose any specific restrictions on this.

[0077] It should be noted that the total energy demand of each air-conditioning indoor unit can be the total energy demand of the indoor units with energy demand. When obtaining the total energy demand of each air-conditioning indoor unit, it can be calculated according to the following formula: ∑Q c =Baseline value*HP*K_fan

[0078] The reference value is related to the difference between the indoor ambient temperature and the indoor ambient set temperature, HP refers to the preset correction value corresponding to the type of the air conditioner indoor unit, and K_fan refers to the wind speed correction coefficient of each air conditioner indoor unit.

[0079] In one embodiment, obtaining the total energy requirement of each air-conditioning indoor unit includes: obtaining the set temperature corresponding to each air-conditioning indoor unit and the indoor ambient temperature of the area where the air-conditioning indoor unit is located; determining the temperature difference between the indoor ambient temperature and the set temperature; querying the target capacity interval corresponding to the temperature difference; determining the corresponding reference value according to the target capacity interval; determining the corresponding wind speed correction coefficient according to the fan speed of each air-conditioning indoor unit; determining a preset correction value according to the model of each air-conditioning indoor unit, and calculating the total energy requirement of each air-conditioning indoor unit according to the reference value, the preset correction value and the wind speed correction coefficient, wherein, for querying the capacity interval corresponding to the temperature difference, refer to Figure 5, and for determining the reference value according to the capacity interval, refer to Table 2.

[0080] Table 2

[0081] In addition, in actual applications, since the fan speed of the air conditioner indoor unit may vary, when calculating the wind speed correction coefficient, in order to reduce the amount of calculation, the wind speed correction coefficient can be calculated according to the wind speed level set by the user. Generally speaking, the larger the wind speed level, the larger the correction coefficient. In the specific calculation process, you can refer to Table 3.

[0082] Table 3

[0083] Step S20: determining a target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit.

[0084] It can be understood that, in this embodiment, the heat recovery mode of the multi-split air conditioner includes a partial heat recovery mode and a full heat recovery mode, wherein the partial heat recovery mode refers to dividing the high-temperature and high-pressure refrigerant at the refrigerant outlet of the compressor into two parts, one part passes through the outdoor heat exchanger, and the other part flows through the hot water tank for heating; the full heat recovery mode refers to the high-temperature and high-pressure refrigerant at the refrigerant outlet of the compressor through the hot water tank for heat recovery and heating.

[0085] Step S30: adjusting the communication state of each reversing device and the throttling element based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

[0086] It should be understood that when the evaporation absorption of the indoor unit of the air conditioner in the multi-split air conditioner is greater than or equal to the heat on the indoor side, which is greater than the heat required by the hot water tank to heat the water, it means that the waste heat during the operation of the air conditioner can support the heating of the hot water tank. At this time, the multi-split air conditioner operates in a partial heat recovery mode, that is, the refrigerant flows from the first four-way valve through the outdoor heat exchanger and directly flows through the hot water tank for heating.

[0087] When the evaporation absorption of the indoor unit of the multi-split air conditioner is less than the indoor heat and greater than the heat required by the hot water tank to heat the water, it means that the waste heat during the operation of the air conditioner cannot support the heating of the hot water tank. At this time, if the electric auxiliary heating device is not started, the connectivity of the four-way valve can be adjusted to allow more high-temperature and high-pressure refrigerant to flow directly into the hot water tank for heating, thereby increasing the temperature of the hot water tank.

[0088] In one embodiment, there is a big difference in the refrigerant flow direction of the two heat recovery modes, especially the refrigerant flow direction of the outdoor heat exchanger of the air conditioner outdoor unit. In order to achieve accurate refrigerant flow ratio division in different heat recovery modes, in this embodiment, the opening of each throttling element can be adjusted to achieve the pressure difference diversion of the refrigerant in different modes. For example: in the partial heat recovery mode, the electronic expansion valve EXV-E on the main line will be subject to the refrigerant pressure from the outdoor heat exchanger and the refrigerant pressure from the hot water tank. At this time, it is necessary to adjust the opening of each electronic expansion valve so that the refrigerant out of the hot water tank will not flow back to the outdoor heat exchanger. At the same time, the two refrigerants can be distributed through the branch electronic expansion valves corresponding to each air conditioner indoor unit.

[0089] This embodiment determines the target heat recovery mode of the multi-split air conditioner by performing mode judgment on the water tank temperature of the hot water tank, the heating energy demand and the total energy demand of each air-conditioning unit when the multi-split air conditioner has both cooling and hot water demands. Then, the connectivity state of the reversing device and the throttling element is adjusted according to the target heat recovery mode, thereby achieving the purpose of having one heat pump system operate cooling and hot water at the same time, heating the water tank with the waste heat of air conditioning cooling, avoiding the technical problem of the existing multi-split air conditioner in which heating and hot water are not performed at the same time, and improving the user experience.

[0090] Refer to FIG6 , which is a flow chart of a second embodiment of an air conditioner control method of the present application.

[0091] Based on the above first embodiment, in one embodiment, step S20 includes:

[0092] Step S201: determining whether the water temperature of the water tank, the middle temperature of the water tank coil, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit meet preset heat recovery conditions.

[0093] It should be noted that the preset heat recovery conditions include at least one of the following conditions: the water temperature of the water tank is greater than the preset first temperature threshold; the temperature in the middle of the water tank coil is greater than or equal to the preset coil temperature; the target heating energy requirement ratio is greater than or equal to the preset energy requirement ratio, and the target heating energy requirement ratio is the ratio between the total energy requirement of each air-conditioning indoor unit and the heating energy requirement. This embodiment does not impose specific restrictions on this.

[0094] Among them, the preset first temperature threshold value range is 48~56℃, for example: 53℃, the preset coil temperature range is 57~63℃, for example: 60℃; the preset energy demand ratio range is 1~2.5, for example: 1.8, and this embodiment does not impose any specific restrictions on this.

[0095] Step S202: If the conditions are met, the air conditioner is in partial heat recovery mode.

[0096] In one embodiment, if the water temperature in the water tank is ≥53°C, or the middle temperature of the water tank coil is ≥60°C, or the ratio between the total energy demand of each air conditioner and the heating energy demand is ≥1.8, the air conditioner operates in partial heat recovery mode.

[0097] Furthermore, when the water temperature of the water tank is lower than a preset second temperature threshold, the middle temperature of the water tank coil is lower than a preset coil temperature, and the target heating energy demand ratio is lower than a preset energy demand ratio, the air conditioner operates in a full heat recovery mode, and the preset second temperature threshold is lower than the preset first temperature threshold;

[0098] When the water temperature of the water tank is lower than a preset first temperature threshold and greater than or equal to a preset second temperature threshold, the target heat recovery mode is determined according to the heat recovery mode last run.

[0099] It is understandable that the preset second temperature threshold value ranges from 38°C to 48°C, for example, 45°C.

[0100] In one embodiment, if the water temperature in the water tank is ≤45°C, the middle temperature of the water tank coil is <60°C, and the ratio of the total energy demand of each air conditioner indoor unit to the heating energy demand is <1.8, the air conditioner operates in full heat recovery mode.

[0101] If the water temperature in the water tank is between 45℃ and 53℃, the heat recovery mode of the last operation will be run. If the multi-split air conditioner is powered on for the first time and the water temperature in the water tank is between 45℃ and 53℃, hot water production and indoor cooling can be achieved simultaneously according to the full heat recovery mode.

[0102] In one embodiment, when the multi-split air conditioner is adjusted from the partial heat recovery mode to the full heat recovery mode, it is necessary to meet the following conditions: the water temperature in the water tank is less than a preset second temperature threshold, the temperature in the middle of the water tank coil is less than the preset coil temperature, and the target heating energy demand ratio is less than the preset energy demand ratio. In addition, it is also necessary to detect within a preset time that the maximum water temperature in the hot water tank is less than or equal to a preset threshold. The preset threshold is related to the water temperature K at the highest point of the running water tank detected in real time after the four-way valve A loses power. The preset time can be 5 minutes.

[0103] In one embodiment, when a multi-split air conditioner is adjusted from a partial heat recovery mode to a full heat recovery mode, it is necessary to meet the following conditions: the water temperature in the water tank is ≤45°C, the temperature in the middle of the water tank coil is <60°C, and the ratio between the total energy demand of each air conditioner indoor unit and the heating energy demand is <1.8. If the highest water temperature in the water tank is detected to be less than or equal to K-5 for 5 consecutive minutes, the air conditioner will operate in the full heat recovery mode.

[0104] In one embodiment, the heat recovery mode of the multi-split air conditioner is determined based on the water temperature of the water tank, the middle temperature of the water tank coil, the heating energy requirement, and the total energy requirement of each air-conditioning unit, so as to improve the heat recovery efficiency and enhance the synchronous cooling and hot water production effect of the multi-split air conditioner.

[0105] Refer to FIG. 7 , which is a flow chart of a third embodiment of an air conditioner control method of the present application.

[0106] Based on the above second embodiment, step S30 includes:

[0107] Step S301: When the target heat recovery mode is the partial heat recovery mode, the first selection end and the second selection end in the first reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device.

[0108] This embodiment is for the heat recovery control of a multi-split air conditioner with only two reversing devices. When two reversing devices are provided in the air conditioner outdoor unit, the reversing device includes a first reversing device and a second reversing device. The first reversing device is respectively connected to the compressor, the outdoor heat exchanger and the hot water tank, and the second reversing device is respectively connected to the compressor, the indoor heat exchanger and the hot water tank.

[0109] It can be understood that the first selection end of the first reversing device refers to the selection end D of the first four-way valve, and the second selection end refers to the selection end C of the first four-way valve. In the partial heat recovery mode, the selection end D and the selection end C of the first four-way valve are connected, so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device, so that a part of the refrigerant can flow through the first four-way valve through the outdoor heat exchanger for heat exchange.

[0110] At this time, the third selection end and the fourth selection end in the second reversing device can also be connected, so that the refrigerant input end of the compressor and the refrigerant output end of the indoor heat exchanger are connected through the second reversing device.

[0111] Among them, the third selection end and the fourth selection end in the second reversing device refer to the selection end S and the selection end E of the second four-way valve respectively, so that the refrigerant passing through the indoor heat exchanger, hot water tank, etc. can flow back to the compressor, facilitating the next refrigerant compression.

[0112] When the target heat recovery mode is the full heat recovery mode, the second selection end and the third selection end in the first reversing device are connected so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device.

[0113] The second selection end and the third selection end of the first reversing device refer to the selection end C and the selection end S of the first four-way valve respectively. In the partial heat recovery mode, the selection end C and the selection end S of the first four-way valve are connected, so that the refrigerant output by the compressor can only be heated through the hot water tank, thereby improving the heating effect of the hot water tank and avoiding the situation where the hot water capacity is poor due to insufficient heat recovery of the multi-split air conditioner.

[0114] In one embodiment, by limiting the connectivity status of the reversing devices in different heat recovery modes when there are two reversing devices in a multi-split air conditioner, heat recovery in different modes can be achieved, the efficiency of heat recovery can be improved, and the user's usage needs in different scenarios can be met.

[0115] Refer to FIG8 , which is a flow chart of a fourth embodiment of an air conditioner control method of the present application.

[0116] Based on the third embodiment above, step S30 further includes:

[0117] Step S301 : When the target heat recovery mode is the partial heat recovery mode, the first selection end and the second selection end in the first reversing device are connected to connect the refrigerant output end of the compressor with the refrigerant input end of the outdoor heat exchanger.

[0118] It should be noted that when a multi-split air conditioner with two reversing devices operates in partial heat recovery mode, since the refrigerant output end of the compressor is directly connected to the hot water tank, no matter how the connecting devices of each reversing device are switched, high-temperature and high-pressure refrigerant is output to the hot water tank, and the water temperature is continuously heated. The water temperature is too high to meet user needs. At this time, the water temperature in the water tank can only be controlled by shutting down the heat pump system of the multi-split air conditioner. Therefore, this embodiment proposes a solution of setting three reversing devices in the multi-split air conditioner.

[0119] It should be noted that this embodiment is for the heat recovery control of a multi-split air conditioner with three reversing devices. Referring to Figure 9, when three reversing devices are provided in the air conditioner outdoor unit, the reversing devices include a first reversing device, a second reversing device and a third reversing device. The first reversing device is respectively connected to the compressor and the outdoor heat exchanger, the second reversing device is respectively connected to the compressor and the indoor heat exchanger, and the third reversing device is respectively connected to the compressor and the hot water tank.

[0120] It can be understood that the first selection end and the second selection end of the first reversing device refer to the selection end D and the selection end C of the first four-way valve respectively, and the first selection end and the second selection end of the third reversing device refer to the selection end D and the selection end E respectively. In the partial heat recovery mode, the selection end D and the selection end C of the first four-way valve are connected, so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device, so that a part of the refrigerant can flow through the first four-way valve through the outdoor heat exchanger for heat exchange.

[0121] Step S302': connecting the first selection end and the second selection end of the third reversing device, so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

[0122] As described above, in the partial heat recovery mode, a part of the refrigerant can flow through the outdoor heat exchanger through the first four-way valve for heat exchange to form the first refrigerant flow direction, and the other part passes through the first selection end and the second selection end of the third reversing device, that is, through the selection end D and the selection end E of the third four-way valve to be output to the hot water tank for heat exchange. If you want to stop heating the water tank, you can also reduce the hot water production capacity by adjusting the connecting device of the third four-way valve to improve the user experience.

[0123] Referring to FIG10 , if the multi-split air conditioner operates in the full heat recovery mode, that is, when the target heat recovery mode is the full heat recovery mode, the second gate terminal and the third gate terminal of the first reversing device are connected so that the refrigerant input terminal of the compressor and the refrigerant output terminal of the outdoor heat exchanger are connected through the first reversing device;

[0124] The second selection end and the third selection end in the third reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

[0125] It can be understood that in both the full heat recovery mode and the partial heat recovery mode, high-temperature and high-pressure refrigerant is required to flow through the hot water tank. Therefore, there is no need to adjust the connectivity status of the third reversing device; when it is detected that the water temperature in the hot water tank is high, or greater than the user's set temperature, the second selection end and the third selection end of the third reversing device can be connected to avoid high-temperature and high-pressure refrigerant from entering the hot water tank to make hot water, wherein the second selection end and the third selection end of the third reversing device refer to the selection end E and the selection end S of the third four-way valve, and can also be the connecting selection end D and the selection end C, and this embodiment does not impose specific restrictions on this.

[0126] In one embodiment, by limiting the connectivity status of the reversing devices in different heat recovery modes when there are three reversing devices in a multi-split air conditioner, heat recovery in different modes is achieved, the efficiency of heat recovery is improved, and the user's usage needs in different scenarios are met. At the same time, the water temperature in the hot water tank is prevented from being too high, affecting user use.

[0127] In addition, an embodiment of the present application further provides a storage medium on which an air conditioner control program is stored. When the air conditioner control program is executed by a processor, the steps of the air conditioner control method described above are implemented.

[0128] Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0129] Refer to FIG. 11 , which is a structural block diagram of a first embodiment of an air conditioner control device of the present application.

[0130] As shown in FIG11 , the air conditioner control device proposed in the embodiment of the present application includes:

[0131] The acquisition module 10 is used to obtain the water tank temperature of the hot water tank, the heating energy requirement and the total energy requirement of each air conditioner indoor unit when the air conditioner has both cooling and hot water requirements.

[0132] The judgment module 20 is configured to determine a target heat recovery mode for the air conditioner according to the water tank temperature, the heating energy requirement, and the total energy requirement of each indoor unit of the air conditioner.

[0133] The adjustment module 30 is used to adjust the communication status of each reversing device and the throttling element based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

[0134] In one embodiment, the judgment module 20 is further used to judge whether the water temperature of the water tank, the middle temperature of the water tank coil, the heating energy demand and the total energy demand of each air-conditioning indoor unit meet the preset heat recovery conditions, and the preset heat recovery conditions include at least one of the following conditions: the water temperature of the water tank is greater than the preset first temperature threshold; the middle temperature of the water tank coil is greater than or equal to the preset coil temperature; the target heating energy demand ratio is greater than or equal to the preset energy demand ratio, and the target heating energy demand ratio is the ratio between the total energy demand of each air-conditioning indoor unit and the heating energy demand; if so, the air conditioner is in partial heat recovery mode.

[0135] In one embodiment, the judgment module 20 is further configured to: when the water temperature in the water tank is lower than a preset second temperature threshold, the temperature in the middle of the water tank coil is lower than a preset coil temperature, and the target heating energy demand ratio is lower than a preset energy demand ratio, the air conditioner operates in all heat recovery modes, and the preset second temperature threshold is lower than the preset first temperature threshold; and when the water temperature in the water tank is lower than the preset first temperature threshold and greater than or equal to the preset second temperature threshold, determine the target heat recovery mode according to the heat recovery mode last operated.

[0136] In one embodiment, the judgment module 20 is also used to connect the first selection end and the second selection end in the first reversing device when the target heat recovery mode is the partial heat recovery mode, so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device.

[0137] In one embodiment, the judgment module 20 is also used to connect the second selection end and the third selection end in the first reversing device when the target heat recovery mode is the full heat recovery mode, so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device.

[0138] In one embodiment, the judgment module 20 is further used to connect the first selection end and the second selection end in the first reversing device when the target heat recovery mode is the partial heat recovery mode, so that the refrigerant output end of the compressor is connected to the refrigerant input end of the outdoor heat exchanger; and connect the first selection end and the second selection end in the third reversing device, so that the refrigerant output end of the compressor is connected to the refrigerant input end of the hot water tank through the third reversing device.

[0139] In one embodiment, the judgment module 20 is also used to connect the second selection end and the third selection end in the first reversing device when the target heat recovery mode is the full heat recovery mode, so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device; connect the first selection end and the second selection end in the third reversing device, so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

[0140] This embodiment determines the target heat recovery mode of the multi-split air conditioner by performing mode judgment on the water tank temperature of the hot water tank, the heating energy demand and the total energy demand of each air-conditioning unit when the multi-split air conditioner has both cooling and hot water demands. Then, the connectivity state of the reversing device and the throttling element is adjusted according to the target heat recovery mode, thereby achieving the purpose of having one heat pump system operate cooling and hot water at the same time, heating the water tank with the waste heat of air conditioning cooling, avoiding the technical problem of the existing multi-split air conditioner in which heating and hot water are not performed at the same time, and improving the user experience.

[0141] Although the various steps in the flowchart in the embodiment of the present application are shown in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order and can be performed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0142] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present application. In specific applications, technicians in this field can make settings as needed, and the present application does not impose any restrictions on this.

[0143] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this application. In actual applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of this embodiment scheme, and no restrictions are imposed here.

[0144] In addition, for technical details not fully described in this embodiment, please refer to the air conditioner control method provided in any embodiment of the present application, and will not be repeated here.

[0145] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0146] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0147] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0148] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling an air conditioner, wherein: The air conditioner control method is applied to a multi-split air conditioner, the multi-split air conditioner comprises: an air conditioner outdoor unit, a plurality of air conditioner indoor units and a hot water module, the air conditioner outdoor unit is respectively connected to each air conditioner indoor unit and the hot water module, a throttling element is respectively arranged between the air conditioner outdoor unit and each air conditioner indoor unit and the hot water module, the air conditioner outdoor unit comprises a compressor, an outdoor heat exchanger and at least two reversing devices, the air conditioner indoor unit comprises: an indoor heat exchanger, the hot water module comprises: a hot water tank, each reversing device is connected to the compressor for controlling the flow direction of the refrigerant; The air conditioner control method comprises: When the air conditioner has both cooling and hot water requirements, obtaining the water tank temperature of the hot water tank, the heating energy requirement, and the total energy requirement of each air conditioner indoor unit; Determining a target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement and the total energy requirement of each air conditioner indoor unit; The communication state of each reversing device and the throttling element is adjusted based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

2. The air conditioner control method according to claim 1, wherein: The target heat recovery mode includes a partial heat recovery mode, and the water tank temperature includes: water tank water temperature and middle temperature of the water tank coil; The step of determining the target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement and the total energy requirement of each air conditioner indoor unit comprises: Determine whether the water temperature of the water tank, the middle temperature of the water tank coil, the heating energy demand and the total energy demand of each air conditioner indoor unit meet a preset heat recovery condition, wherein the preset heat recovery condition includes at least one of the following conditions: the water temperature of the water tank is greater than a preset first temperature threshold; the middle temperature of the water tank coil is greater than or equal to a preset coil temperature; a target heating energy demand ratio is greater than or equal to a preset energy demand ratio, and the target heating energy demand ratio is the ratio between the total energy demand of each air conditioner indoor unit and the heating energy demand; If so, the air conditioner is in partial heat recovery mode.

3. The air conditioner control method according to claim 1, wherein: The target heat recovery mode also includes a full heat recovery mode; The step of determining the target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement and the total energy requirement of each air conditioner indoor unit further includes: When the water temperature of the water tank is less than the preset second temperature threshold, the middle temperature of the water tank coil is less than the preset coil temperature, and the target heating energy demand ratio is less than the preset energy demand ratio, the air conditioner operates in full heat recovery mode, and the preset second temperature threshold is less than the preset first temperature threshold; When the water temperature of the water tank is lower than a preset first temperature threshold and higher than or equal to a preset second temperature threshold, a target heat recovery mode is determined according to a heat recovery mode last run.

4. The air conditioner control method according to any one of claims 1 to 3, wherein: When two reversing devices are provided in the air conditioner outdoor unit, the reversing devices include a first reversing device and a second reversing device, the first reversing device is respectively connected to the compressor, the outdoor heat exchanger and the hot water tank, and the second reversing device is respectively connected to the compressor, the indoor heat exchanger and the hot water tank; Adjusting the connection state of each reversing device based on the target heat recovery mode includes: When the target heat recovery mode is a partial heat recovery mode, the first selection end and the second selection end in the first reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the outdoor heat exchanger are connected through the first reversing device.

5. The air conditioner control method according to claim 4, wherein: The air conditioner control method further includes: When the target heat recovery mode is the full heat recovery mode, the second selection end and the third selection end in the first reversing device are connected so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device.

6. The air conditioner control method according to any one of claims 1 to 3, wherein: When three reversing devices are provided in the air conditioner outdoor unit, the reversing devices include a first reversing device, a second reversing device and a third reversing device, the first reversing device is respectively connected to the compressor and the outdoor heat exchanger, the second reversing device is respectively connected to the compressor and the indoor heat exchanger, and the third reversing device is respectively connected to the compressor and the hot water tank; Adjusting the connection state of each reversing device based on the target heat recovery mode also includes: When the target heat recovery mode is a partial heat recovery mode, connecting the first selection end and the second selection end in the first reversing device so that the refrigerant output end of the compressor is connected to the refrigerant input end of the outdoor heat exchanger; The first selection end and the second selection end in the third reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

7. The air conditioner control method according to claim 6, wherein: The air conditioner control method further includes: When the target heat recovery mode is the full heat recovery mode, the second selection end and the third selection end in the first reversing device are connected, so that the refrigerant input end of the compressor and the refrigerant output end of the outdoor heat exchanger are connected through the first reversing device; The first selection end and the second selection end in the third reversing device are connected so that the refrigerant output end of the compressor and the refrigerant input end of the hot water tank are connected through the third reversing device.

8. An air conditioner control device, wherein: The air conditioner control device comprises: An acquisition module, used for acquiring the water tank temperature of the hot water tank, the heating energy requirement and the total energy requirement of each air conditioner indoor unit when the air conditioner has both cooling and hot water requirements; A determination module, configured to determine a target heat recovery mode of the air conditioner according to the water tank temperature, the heating energy requirement and the total energy requirement of each air conditioner indoor unit; The adjustment module is used to adjust the connection state of each reversing device and the throttling element based on the target heat recovery mode to adjust the refrigerant flow ratio of the hot water tank and the indoor heat exchanger.

9. A multi-split air conditioner, wherein: The multi-split air conditioner includes: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program is configured to implement the air conditioner control method according to any one of claims 1 to 7.

10. A storage medium, wherein: The storage medium stores an air conditioner control program, and when the air conditioner control program is executed by the processor, the air conditioner control method according to any one of claims 1 to 7 is implemented.

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