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

Abstract

The present application discloses a multi-split air conditioner control method and device, a multi-split air conditioner, and a storage medium. The method comprises: when a multi-split air conditioner is started in a partial heat recovery mode, acquiring refrigeration demand information of indoor units; on the basis of the refrigeration demand information, performing initialization control of a compressor of an outdoor unit; after the initialization control is quitted, determining a target adjustment gear of the compressor on the basis of a control reference temperature value of the multi-split air conditioner; and on the basis of the target adjustment gear, controlling the compressor to use waste heat of refrigeration to supply heat to an indoor water tank.

Description

Multi-split 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. 202310986019.7 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 a control method and device for a multi-split air conditioner, a multi-split air conditioner, and a storage medium. Background Art

[0004] Currently, multi-split air conditioners are increasingly being equipped with terminals. These can be used with indoor air conditioner terminals and water tanks. This heat pump system can provide not only air conditioning services to different rooms, but also domestic hot water services. Specifically, a single outdoor unit is paired with multiple indoor air conditioners and a hydraulic module terminal. The hydraulic module terminal is connected to an external water tank. The system provides air conditioning services through the indoor air conditioners and hot water services through the water tank.

[0005] Since air conditioning and hot water share a heat pump system, when air conditioning is used for cooling in the summer, electric auxiliary heating may be used to heat the water in the water tank. This results in cooling and hot water being unable to operate at the same time, or when they operate at the same time, electric heating is required to heat the water, which is not energy-efficient.

[0006] 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.

[0007] Summary of the Invention

[0008] The main purpose of this application is to provide a multi-split air conditioner control method, device, multi-split air conditioner and storage medium, aiming to solve the technical problem that in the prior art, refrigeration and hot water production cannot be operated at the same time, or when they are operated at the same time, electric heating is required to boil water, which is not energy-saving.

[0009] To achieve the above-mentioned object, the present application provides a multi-split air conditioner control method, which is applied to a multi-split air conditioner, wherein the multi-split air conditioner includes an indoor water tank, an outdoor unit, and a plurality of indoor units, wherein the outdoor unit is connected to the indoor water tank, and each indoor unit is respectively connected to the outdoor unit;

[0010] The multi-split air conditioner control method includes:

[0011] When the multi-split air conditioner is started in a partial heat recovery mode, obtaining cooling demand information of each indoor unit;

[0012] performing initialization control of the compressor of the outdoor unit according to the cooling demand information;

[0013] After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner;

[0014] The gear is adjusted according to the target to control the compressor to utilize the waste heat of refrigeration to heat the indoor water tank.

[0015] In one embodiment, the initialization control of the compressor of the outdoor unit according to the cooling demand information includes:

[0016] Determining the outdoor unit model coefficient and the indoor energy demand information of the indoor unit with cooling demand according to the cooling demand information;

[0017] determining an operating frequency of a compressor according to the outdoor unit model coefficient and the indoor energy demand information;

[0018] Initialization control of the compressor of the outdoor unit is performed according to the operating frequency.

[0019] In one embodiment, determining the outdoor unit model coefficient and the indoor energy demand information of the indoor unit with cooling demand based on the cooling demand information includes:

[0020] Determine the outdoor unit model coefficient, as well as the temperature demand value interval information, indoor unit model basic value and wind speed correction coefficient of each indoor unit with cooling demand according to the cooling demand information;

[0021] Indoor energy demand information of the indoor unit with cooling demand is determined according to the temperature demand value interval information, the indoor unit model basic value and the wind speed correction coefficient.

[0022] In one embodiment, the multi-split air conditioner further comprises a low pressure sensor connected to the outdoor unit;

[0023] After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner includes:

[0024] Obtaining a low pressure value collected by the low pressure sensor, and determining a control reference temperature value according to the low pressure value, wherein the control reference temperature value is a saturated temperature of the refrigerant converted to a saturated gas state;

[0025] A target adjustment gear of the compressor is determined according to the control reference temperature value.

[0026] In one embodiment, determining the target adjustment gear of the compressor according to the control reference temperature value includes:

[0027] Obtaining a cooling target evaporation temperature, and determining a frequency adjustment parameter according to the converted saturation temperature and the cooling target evaporation temperature;

[0028] The target adjustment gear is determined according to the frequency adjustment parameter and the frequency adjustment comparison table.

[0029] In one embodiment, after exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner includes:

[0030] Collect the evaporator temperature of each indoor unit that has cooling capacity requirements;

[0031] Determine a control reference temperature value according to the evaporator temperature, wherein the control reference temperature value is an average value of the temperatures of each evaporator;

[0032] A target adjustment gear of the compressor is determined according to the control reference temperature value.

[0033] In one embodiment, determining the target adjustment gear of the compressor according to the control reference temperature value includes:

[0034] querying a gear adjustment comparison chart according to the control reference temperature value to determine an image area corresponding to the control reference temperature value;

[0035] A target adjustment gear of the compressor is determined according to the image area.

[0036] In addition, to achieve the above-mentioned purpose, the present application also proposes a multi-split air conditioner control device, the multi-split air conditioner control device comprising:

[0037] an information acquisition module, configured to acquire cooling demand information of each indoor unit when the multi-split air conditioner is started in a partial heat recovery mode;

[0038] an initialization module, configured to perform initialization control of the compressor of the outdoor unit according to the refrigeration demand information;

[0039] a gear determination module, configured to determine a target adjustment gear of the compressor according to a control reference temperature value of the multi-split air conditioner after exiting the initialization control;

[0040] The water tank heating module is used to adjust the gear according to the target to control the compressor to use the waste heat of refrigeration to heat the indoor water tank.

[0041] In addition, to achieve the above-mentioned purpose, the present application also proposes a multi-split air conditioner control device, which includes: a memory, a processor, and a multi-split air conditioner control program stored on the memory and running on the processor, and the multi-split air conditioner control program is configured to implement the multi-split air conditioner control method as described above.

[0042] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a multi-split air conditioner control program is stored. When the multi-split air conditioner control program is executed by a processor, the multi-split air conditioner control method as described above is implemented.

[0043] The present application obtains the cooling demand information of each indoor unit when the multi-split air conditioner is started in partial heat recovery mode; performs initialization control on the compressor of the outdoor unit based on the cooling demand information; after exiting the initialization control, determines the target adjustment gear of the compressor based on the control reference temperature value of the multi-split air conditioner; and controls the compressor based on the target adjustment gear to utilize the waste heat from refrigeration to heat the indoor water tank. In this way, when the multi-split air conditioner is started in partial heat recovery mode, initialization control is performed based on the cooling demand of each indoor unit, and then the gear of the compressor is adjusted based on the control reference temperature value, thereby utilizing the waste heat from refrigeration of the air conditioner to heat the indoor water tank for hot water production, thereby achieving simultaneous air conditioning cooling and hot water production without the use of additional electric auxiliary heating, which is more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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;

[0045] FIG2 is a flow chart of a first embodiment of a method for controlling a multi-split air conditioner according to the present invention;

[0046] FIG3 is a schematic diagram of determining the required temperature range of an indoor unit in an embodiment of a method for controlling a multi-split air conditioner of the present application;

[0047] FIG4 is a flow chart of a second embodiment of a method for controlling a multi-split air conditioner according to the present invention;

[0048] FIG5 is a schematic diagram of a system structure in an embodiment of a multi-split air conditioner control method of the present application;

[0049] FIG6 is a flow chart of a third embodiment of a method for controlling a multi-split air conditioner according to the present invention;

[0050] FIG7 is a schematic diagram of another system structure in an embodiment of the multi-split air conditioner control method of the present application;

[0051] FIG8 is a diagram showing the gear adjustment comparison in an embodiment of the multi-split air conditioner control method of the present application;

[0052] FIG9 is a structural block diagram of the first embodiment of the multi-split air conditioner control device of the present application.

[0053] Description of Figure Numbers:

[0054] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0056] 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.

[0057] 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) memory, 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.

[0058] 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.

[0059] As shown in FIG1 , the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a multi-split air conditioner control program.

[0060] 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 multi-split air conditioner control program stored in the memory 1005 through the processor 1001, and executes the multi-split air conditioner control method provided by the embodiment of the present application.

[0061] An embodiment of the present application provides a method for controlling a multi-split air conditioner. Referring to FIG. 2 , FIG. 2 is a flow chart of a first embodiment of a method for controlling a multi-split air conditioner of the present application.

[0062] In this embodiment, the multi-split air conditioner control method includes the following steps:

[0063] Step S10: When the multi-split air conditioner is started in a partial heat recovery mode, the cooling demand information of each indoor unit is obtained.

[0064] In one embodiment, the execution subject may be the multi-split air conditioner, which has functions such as data processing, data communication, and program execution. 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 multi-split air conditioner as an example.

[0065] It should be noted that in partial heat recovery mode, when the indoor heat absorbed by the chiller's indoor units exceeds the heat required to heat the water in the water tank, the excess waste heat is dissipated to the surrounding air through the outdoor heat exchanger. The chiller operates with the water tank on to generate hot water, the indoor units in evaporation mode, and the outdoor units in condensing mode. At this point, the primary demand is cooling, so the unit's capacity target controls the compressor frequency based on the cooling demand of the indoor units. This means the compressor is initialized based on cooling demand, and then the compressor frequency is controlled and adjusted based on the corresponding target. The system prioritizes cooling demand. After setting the initial frequency, the system compares cooling demand with hot water demand. If cooling demand is higher, the water tank and outdoor units for hot water generation dissipate heat, utilizing waste heat for cooling. If hot water demand is higher, waste heat is used for hot water generation. There are two ways to adjust the compressor frequency: one is to use a low-pressure sensor to control the low-pressure value, and the other is to use the cooling effect of the indoor units, namely the evaporation temperature, to adjust the compressor frequency.

[0066] It should be understood that, first, when the partial heat recovery mode is started, the cooling demand information of each indoor unit with cooling demand is obtained, including various parameters of the outdoor and indoor units of the multi-split air conditioner, and the energy demand of the cooling indoor unit.

[0067] In one embodiment, the letters are defined as follows: T1, indoor ambient temperature sensor; Ts, indoor set temperature; T2, temperature sensor in the middle of the evaporator coil; T3, temperature sensor in the middle of the condenser coil; T4, outdoor ambient temperature sensor; Tc, refrigerant saturation temperature corresponding to the exhaust pressure; Te, refrigerant saturation temperature corresponding to the return air pressure; Tw, water temperature of the water tank.

[0068] Step S20: performing initialization control of the compressor of the outdoor unit according to the cooling demand information.

[0069] In one embodiment, performing initialization control according to cooling demand information refers to calculating the frequency to which the compressor needs to be adjusted according to the cooling demand information, and then performing initialization startup operation of the compressor according to the target operating frequency.

[0070] Furthermore, to adjust the compressor's initial operating frequency based on cooling energy demand, the outdoor unit model coefficient and the indoor energy demand information of the indoor units with cooling demand are first determined based on the cooling demand information. The compressor's operating frequency is then calculated based on the outdoor unit model coefficient and the indoor energy demand information, thereby performing initial control.

[0071] It should be noted that the calculation method is: Fn = Out_HP * ∑CQ_N, where Fn is the compressor operating frequency code. Codes correspond to different frequency values, generally starting from F1 = 16Hz or 20Hz and increasing in increments of 3-5Hz, i.e., F2 = 20, F3 = 24, and so on. Out_HP is the outdoor unit model coefficient. For example, for a model with a nominal cooling capacity of 7800W, Out_HP = 3. CQ is the capacity requirement of the indoor unit with cooling demand, that is, the indoor energy demand information of the indoor unit.

[0072] Furthermore, in order to accurately calculate the indoor energy demand information of all indoor units, the temperature demand value range information of the indoor units with cooling demand, as well as the basic value of the indoor unit model and the wind speed correction coefficient are determined according to the cooling demand information.

[0073] It should be understood that the indoor energy demand information CQ = TQ * HP * K_fan, where TQ is the required temperature value of the refrigeration unit, HP is the basic value of the indoor unit model, and K_fan is the indoor wind speed correction coefficient. The specific values ​​are as follows:

[0074] 1. TQ is the temperature demand value interval for the refrigeration unit. Figure 3 shows a reference image for temperature demand value comparison query. Based on Figure 3, the temperature demand value interval information for each indoor unit can be determined. The default value is determined based on the descending curve. The benchmark values ​​for different capacity demand intervals are shown in Table 1 below:

[0075] Table 1

[0076] 2. HP is the basic value for internal unit models: 26 unit HP = 1.0; 32 / 35 unit HP = 1.2; 48 / 53 unit HP = 1.5.

[0077] 3. K_Fan: Indoor unit wind speed correction coefficient, which can be found in Table 2 below (the default setting is high wind speed when in automatic mode).

[0078] Table 2

[0079] In this way, the indoor energy demand information can be accurately calculated, and then the frequency of the compressor initialization control can be accurately obtained.

[0080] Step S30: After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner.

[0081] In one embodiment, after detecting the exit of initialization control, the control reference temperature value of the multi-split air conditioner is determined based on the collected data. The control reference temperature value corresponds to different parameter values ​​in different situations. Specifically, it can correspond to the saturation temperature converted from the refrigerant to the saturated gas state, and the average value of the evaporator temperature.

[0082] It should be noted that after the control reference temperature value is determined, the corresponding gear adjustment comparison diagram and frequency adjustment comparison table are queried according to the control reference temperature value to determine the target adjustment gear.

[0083] Step S40: adjusting the gear according to the target to control the compressor to utilize the waste heat of refrigeration to heat the indoor water tank.

[0084] It should be understood that after the target adjustment gear is determined, the compressor is controlled to operate according to the target adjustment gear, so that the power of the compressor can match the energy demand for hot water production, and then the waste heat of the air conditioner cooling is used to provide heating for the indoor water tank to produce hot water.

[0085] In one embodiment, when a multi-split air conditioner is started in partial heat recovery mode, initialization control is performed according to the cooling demand of each indoor unit, and then the gear of the compressor is adjusted according to the control reference temperature value, so that the waste heat from the air conditioner cooling is used to heat the indoor water tank to produce hot water, so that air conditioning cooling and hot water production are performed simultaneously without the use of additional electric auxiliary heating, which is more energy-efficient.

[0086] Refer to FIG4 , which is a flow chart of a second embodiment of a multi-split air conditioner control method of the present application.

[0087] Based on the first embodiment, the multi-split air conditioner of this embodiment further includes a low-pressure sensor connected to the outdoor unit. The multi-split air conditioner control method includes the following steps in step S30:

[0088] Step S301: obtaining a low pressure value collected by the low pressure sensor, and determining a control reference temperature value according to the low pressure value, wherein the control reference temperature value is a saturated temperature of the refrigerant converted into a saturated gas state.

[0089] It should be noted that, as shown in Figure 5, which is a structural diagram of the multi-split air conditioner in this embodiment, a low-pressure sensor is provided at the outdoor unit. The low-pressure value of the refrigerant is collected by the low-pressure sensor, and then converted into the converted saturated temperature of the saturated gas state of the refrigerant based on the low-pressure value as the control reference temperature value.

[0090] Step S302: determining a target adjustment gear of the compressor according to the control reference temperature value.

[0091] It should be understood that after determining the converted saturation temperature, the target evaporating temperature of the refrigeration is obtained, and the frequency adjustment parameter is calculated based on the target evaporating temperature combined with the control reference temperature value, and finally the frequency adjustment reference table is queried to determine the target adjustment gear.

[0092] To determine the target adjustment level, first re-obtain the cooling target evaporation temperature, with a recommended value of 9°C and a range of 5 to 12°C. The frequency adjustment parameter is calculated as: X = Te_TARGET - Te, where Te_TARGET is the cooling target evaporation temperature and Te is the control reference temperature.

[0093] In one embodiment, the frequency adjustment comparison table is shown in Table 3.

[0094] Table 3

[0095] The unit of the action cycle is seconds.

[0096] In one embodiment, the frequency adjustment parameter is calculated by calculating the control reference temperature value and the refrigeration target evaporating temperature in the calculation formula, and then the gear is determined to be opened or closed by querying the frequency adjustment reference table, so as to accurately determine the target adjustment gear, so that the compressor frequency is adjusted based on the low pressure value of the refrigerant more accurately.

[0097] Refer to FIG. 6 , which is a flow chart of a third embodiment of a multi-split air conditioner control method according to the present application.

[0098] Based on the first embodiment, the multi-split air conditioner control method includes the following steps in step S30:

[0099] Step S31: collecting the evaporator temperature of each indoor unit that has cooling capacity demand.

[0100] It should be noted that the structure in this embodiment is shown in FIG7 , and the compressor frequency is corrected based on the average value of the evaporator temperature T2 of each indoor unit with cooling capacity demand (excluding those in standby, mode conflict, or cooling reaching the set temperature).

[0101] It should be understood that the temperature of the evaporator of each indoor unit having cooling demand is first collected.

[0102] Step S32: determining a control reference temperature value according to the evaporator temperature, wherein the control reference temperature value is an average value of the temperatures of the evaporators.

[0103] It should be understood that after the evaporator temperatures of the indoor units with cooling demand are obtained, an average value is calculated and used as a control reference temperature value.

[0104] Step S33: determining the target adjustment gear of the compressor according to the control reference temperature value.

[0105] In one embodiment, the target adjustment gear of the compressor determined according to the control reference temperature value relies on querying the gear adjustment comparison map, so as to determine the adjustment action of the compressor gear, which can be maintained unchanged, increased by one gear, or decreased by one gear.

[0106] Furthermore, to accurately determine the target adjustment gear, first query the gear adjustment comparison chart based on the control reference temperature value. The gear adjustment comparison chart is shown in Figure 8, where T2_COOL_UP is the limit temperature of the frequency adjustment rising zone, with a recommended value of 9°C and a range of 7 to 12°C; T2_COOL_LOW is the limit temperature of the frequency adjustment falling zone, with a recommended value of 7°C and a range of 5 to 8°C; Cool_AdjTime_EE is the adjustment period, with a recommended value of 120s and a range of 60 to 300s.

[0107] It should be noted that there are three ways to confirm the target adjustment gear, which correspond to the control reference temperature value at different positions in the gear adjustment comparison chart, as follows:

[0108] 1) If in the descending zone, the current gear will be downgraded by 1 gear every Cool_AdjTime_EE until F1;

[0109] 2) If in the rising zone, at the current gear, increase by 1 gear every Cool_AdjTime_EE until the maximum value allowed is corrected.

[0110] 3) If in the hold zone, the current gear frequency will be maintained.

[0111] This embodiment calculates the target adjustment gear by the average temperature of the indoor unit's evaporator, so that the output of the compressor can be flexibly adjusted according to the energy demand of each indoor unit, thereby utilizing waste heat to produce hot water, reducing the use of electric auxiliary heating, and achieving greater energy conservation.

[0112] In addition, an embodiment of the present application further proposes a storage medium on which a multi-split air conditioner control program is stored. When the multi-split air conditioner control program is executed by a processor, the steps of the multi-split air conditioner control method described above are implemented.

[0113] 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.

[0114] 8 , which is a structural block diagram of a first embodiment of a multi-split air conditioner control device according to the present application.

[0115] As shown in FIG8 , the multi-split air conditioner control device proposed in the embodiment of the present application includes:

[0116] The information acquisition module 10 is used to acquire the cooling demand information of each indoor unit when the multi-split air conditioner is started in a partial heat recovery mode.

[0117] In one embodiment, the execution subject may be the multi-split air conditioner, which has functions such as data processing, data communication, and program execution. 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 multi-split air conditioner as an example.

[0118] It should be noted that in partial heat recovery mode, when the indoor heat absorbed by the chiller's indoor units exceeds the heat required to heat the water in the water tank, the excess waste heat is dissipated to the surrounding air through the outdoor heat exchanger. The chiller operates with the water tank on to generate hot water, the indoor units in evaporation mode, and the outdoor units in condensing mode. At this point, the primary demand is cooling, so the unit's capacity target controls the compressor frequency based on the cooling demand of the indoor units. This means the compressor is initialized based on cooling demand, and then the compressor frequency is controlled and adjusted based on the corresponding target. The system prioritizes cooling demand. After setting the initial frequency, the system compares cooling demand with hot water demand. If cooling demand is higher, the water tank and outdoor units for hot water generation dissipate heat, utilizing waste heat for cooling. If hot water demand is higher, waste heat is used for hot water generation. There are two ways to adjust the compressor frequency: one is to use a low-pressure sensor to control the low-pressure value, and the other is to use the cooling effect of the indoor units, namely the evaporation temperature, to adjust the compressor frequency.

[0119] It should be understood that, first, when the partial heat recovery mode is started, the cooling demand information of each indoor unit with cooling demand is obtained, including various parameters of the outdoor and indoor units of the multi-split air conditioner, and the energy demand of the cooling indoor unit.

[0120] In one embodiment, the letters in this embodiment are defined as follows: T1, indoor environment temperature sensor; Ts, indoor set temperature; T2, temperature sensor in the middle of the evaporator coil; T3, temperature sensor in the middle of the condenser coil; T4, outdoor environment temperature sensor; Tc, refrigerant saturation temperature corresponding to the exhaust pressure; Te, refrigerant saturation temperature corresponding to the return air pressure; Tw, water temperature of the water tank.

[0121] The initialization module 20 is configured to perform initialization control of the compressor of the outdoor unit according to the cooling demand information.

[0122] In one embodiment, performing initialization control according to cooling demand information refers to calculating the frequency to which the compressor needs to be adjusted according to the cooling demand information, and then performing initialization startup operation of the compressor according to the target operating frequency.

[0123] Furthermore, to adjust the compressor's initial operating frequency based on cooling energy demand, the outdoor unit model coefficient and the indoor energy demand information of the indoor units with cooling demand are first determined based on the cooling demand information. The compressor's operating frequency is then calculated based on the outdoor unit model coefficient and the indoor energy demand information, thereby performing initial control.

[0124] It should be noted that the calculation method is: Fn = Out_HP * ∑CQ_N, where Fn is the compressor operating frequency code. Codes correspond to different frequency values, generally starting from F1 = 16Hz or 20Hz and increasing in increments of 3-5Hz, i.e., F2 = 20, F3 = 24, and so on. Out_HP is the outdoor unit model coefficient. For example, for a model with a nominal cooling capacity of 7800W, Out_HP = 3. CQ is the capacity requirement of the indoor unit with cooling demand, that is, the indoor energy demand information of the indoor unit.

[0125] Furthermore, in order to accurately calculate the indoor energy demand information of all indoor units, the temperature demand value range information of the indoor units with cooling demand, as well as the basic value of the indoor unit model and the wind speed correction coefficient are determined according to the cooling demand information.

[0126] It should be understood that the indoor energy demand information CQ = TQ * HP * K_fan, where TQ is the required temperature value of the refrigeration unit, HP is the basic value of the indoor unit model, and K_fan is the indoor wind speed correction coefficient. The specific values ​​are as follows:

[0127] 1. TQ is the temperature demand value interval for the refrigeration unit. Figure 3 shows a reference image for temperature demand value comparison query. Based on Figure 3, the temperature demand value interval information for each indoor unit can be determined. The default value is determined based on the descending curve. The benchmark values ​​for different capacity demand intervals are shown in Table 1 below:

[0128] Table 1

[0129] 2. HP is the basic value for internal unit models: 26 unit HP = 1.0; 32 / 35 unit HP = 1.2; 48 / 53 unit HP = 1.5.

[0130] 3. K_Fan: Indoor unit wind speed correction coefficient, which can be found in Table 2 below (the default setting is high wind speed when in automatic mode).

[0131] Table 2

[0132] In this way, the indoor energy demand information can be accurately calculated, and then the frequency of the compressor initialization control can be accurately obtained.

[0133] The gear determination module 30 is used to determine the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner after exiting the initialization control.

[0134] In one embodiment, after detecting the exit of initialization control, the control reference temperature value of the multi-split air conditioner is determined based on the collected data. The control reference temperature value corresponds to different parameter values ​​under different circumstances. Specifically, it can correspond to the saturation temperature converted from the refrigerant physical properties to the saturated gas state, and the average value of the evaporator temperature.

[0135] It should be noted that after the control reference temperature value is determined, the corresponding gear adjustment comparison diagram and frequency adjustment comparison table are queried according to the control reference temperature value to determine the target adjustment gear.

[0136] The water tank heating module 40 is used to adjust the gear according to the target to control the compressor to use the waste heat of refrigeration to heat the indoor water tank.

[0137] It should be understood that after the target adjustment gear is determined, the compressor is controlled to operate according to the target adjustment gear, so that the power of the compressor can match the energy demand for hot water production, and then the waste heat of the air conditioner cooling is used to provide heating for the indoor water tank to produce hot water.

[0138] In one embodiment, when a multi-split air conditioner is started in partial heat recovery mode, initial control is performed according to the cooling demand of each indoor unit, and then the gear of the compressor is adjusted according to the control reference temperature value, so that the waste heat of the air conditioner cooling is used to heat the indoor water tank to produce hot water, so that air conditioning cooling and hot water production are performed simultaneously without using additional electric auxiliary heating, which is more energy-efficient.

[0139] 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.

[0140] 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.

[0141] In addition, for technical details not fully described in this embodiment, please refer to the multi-split air conditioner control method provided in any embodiment of the present application, and will not be repeated here.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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 a multi-split air conditioner, wherein: The multi-split air conditioner control method is applied to a multi-split air conditioner, wherein the multi-split air conditioner comprises an indoor water tank, an outdoor unit and a plurality of indoor units, wherein the outdoor unit is connected to the indoor water tank, and each indoor unit is respectively connected to the outdoor unit; The multi-split air conditioner control method comprises: When the multi-split air conditioner is started in a partial heat recovery mode, obtaining cooling demand information of each indoor unit; performing initialization control of a compressor of the outdoor unit according to the refrigeration demand information; After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner; The gear is adjusted according to the target to control the compressor to utilize the waste heat of refrigeration to heat the indoor water tank.

2. The multi-split air conditioner control method according to claim 1, wherein: The initialization control of the compressor of the outdoor unit according to the refrigeration demand information includes: Determine the outdoor unit model coefficient and the indoor energy demand information of the indoor unit with cooling demand according to the cooling demand information; determining an operating frequency of a compressor according to the outdoor unit model coefficient and the indoor energy demand information; Initialization control of the compressor of the outdoor unit is performed according to the operating frequency.

3. The multi-split air conditioner control method according to claim 2, wherein: The step of determining the outdoor unit model coefficient and the indoor energy demand information of the indoor unit with cooling demand according to the cooling demand information includes: Determine the outdoor unit model coefficient, as well as the temperature demand value interval information, indoor unit model basic value and wind speed correction coefficient of each indoor unit with cooling demand according to the cooling demand information; Indoor energy demand information of an indoor unit with cooling demand is determined according to the temperature demand value interval information, the indoor unit model basic value and the wind speed correction coefficient.

4. The multi-split air conditioner control method according to claim 1, wherein: The multi-split air conditioner further comprises a low pressure sensor, which is connected to the outdoor unit; After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner includes: Obtaining a low pressure value collected by the low pressure sensor, and determining a control reference temperature value according to the low pressure value, wherein the control reference temperature value is a converted saturation temperature of the refrigerant converted to a saturated gas state; A target adjustment gear of the compressor is determined according to the control reference temperature value.

5. The multi-split air conditioner control method according to claim 4, wherein: The step of determining the target adjustment gear of the compressor according to the control reference temperature value comprises: Acquiring a cooling target evaporating temperature, and determining a frequency adjustment parameter according to the converted saturation temperature and the cooling target evaporating temperature; The target adjustment gear is determined according to the frequency adjustment parameter and the frequency adjustment comparison table.

6. The multi-split air conditioner control method according to claim 1, wherein: After exiting the initialization control, determining the target adjustment gear of the compressor according to the control reference temperature value of the multi-split air conditioner includes: Collect the evaporator temperature of each indoor unit that has cooling capacity demand; Determine a control reference temperature value according to the evaporator temperature, wherein the control reference temperature value is an average value of the temperatures of each evaporator; A target adjustment gear position of the compressor is determined according to the control reference temperature value.

7. The method for controlling a multi-split air conditioner according to claim 6, wherein: The step of determining the target adjustment gear position of the compressor according to the control reference temperature value comprises: Querying a gear adjustment comparison chart according to the control reference temperature value, and determining an image area corresponding to the control reference temperature value; A target adjustment gear of the compressor is determined according to the image area.

8. A multi-split air conditioner control device, wherein: The multi-connected air conditioner control device comprises: An information acquisition module, used to acquire cooling demand information of each indoor unit when the multi-split air conditioner is started in a partial heat recovery mode; An initialization module, used for performing initialization control of the compressor of the outdoor unit according to the refrigeration demand information; A gear determination module, used for determining a target adjustment gear of the compressor according to a control reference temperature value of the multi-split air conditioner after exiting the initialization control; The water tank heating module is used to adjust the gear according to the target to control the compressor to use the waste heat of refrigeration to heat the indoor water tank.

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

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

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