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

Abstract

The application discloses a kind of multi-connected air conditioner control method, device, multi-connected air conditioner and storage medium, belong to air conditioner technical field.The application is by in the multi-connected air conditioner with partial heat recovery mode start, obtains the refrigeration demand information of each indoor unit;According to the refrigeration demand information, the initialization control of the compressor of the outdoor unit is carried out;After exiting initialization control, according to the control reference temperature value of the multi-connected air conditioner, the target adjustment gear of the compressor is determined;According to the target adjustment gear, the compressor is controlled to utilize the waste heat of refrigeration to heat the indoor water tank.By this way, the waste heat of air conditioner refrigeration is used to heat indoor water tank to heat water, so that air conditioning refrigeration and hot water are carried out at the same time, and electric auxiliary heating is not additionally used, more energy-saving.

Description

Technical Field

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

[0002] Currently, multi-split air conditioners are increasingly being paired with terminal units. User scenarios include using indoor air conditioning units and a water tank. This heat pump system can provide not only air conditioning services to different rooms but also domestic hot water services. Specifically, one outdoor unit is paired with multiple indoor air conditioning units and a hydraulic module terminal. The hydraulic module terminal is connected to an outdoor water tank. The system provides air conditioning services through the indoor air conditioning units and hot water services through the water tank.

[0003] Since the air conditioner and hot water share the same heat pump system, when using the air conditioner for cooling in the summer, the water tank may use electric auxiliary heating to heat the water. This means that cooling and hot water production cannot be carried out at the same time, or when they are carried out at the same time, electric heating is required to heat the water, which is not energy-efficient.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a control method, device, multi-split air conditioner, and storage medium for a multi-split air conditioner, aiming to solve the technical problem that existing technologies cannot operate cooling and hot water production simultaneously, or require electric heating to heat water when operating simultaneously, resulting in energy waste.

[0006] To achieve the above objectives, the present invention provides a control method for a multi-split air conditioner. The control method is applied to a multi-split air conditioner, which includes an indoor water tank, an outdoor unit, and multiple indoor units. The outdoor unit is connected to the indoor water tank, and each indoor unit is connected to the outdoor unit. The multi-split air conditioner control method includes: When the multi-split air conditioner is started in partial heat recovery mode, the cooling demand information of each indoor unit is obtained; The compressor of the outdoor unit is initialized based on the cooling demand information. After exiting the initialization control, the target adjustment level of the compressor is determined based on the control reference temperature value of the multi-split air conditioner; According to the target, the compressor is adjusted to use the waste heat from refrigeration to heat the indoor water tank.

[0007] Optionally, the initialization control of the outdoor unit's compressor based on the cooling demand information includes: Based on the cooling demand information, determine the outdoor unit model coefficient and the indoor energy demand information of the indoor units with cooling demand; The operating frequency of the compressor is determined based on the outdoor unit model coefficient and the internal energy demand information; The compressor of the outdoor unit is initialized and controlled according to the operating frequency.

[0008] Optionally, determining the outdoor unit model coefficient and the indoor energy demand information of the indoor units with cooling demand based on the cooling demand information includes: Based on the cooling demand information, determine the outdoor unit model coefficient, as well as the temperature demand range information, indoor unit model base value, and wind speed correction coefficient for each indoor unit with cooling demand. Based on the temperature demand range information, the basic value of the indoor unit model, and the wind speed correction coefficient, the indoor energy demand information of the indoor unit with cooling demand is determined.

[0009] Optionally, the multi-split air conditioner further includes a low-pressure sensor, which is connected to the outdoor unit; After exiting the initialization control, determining the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner includes: The low-pressure value collected by the low-pressure sensor is obtained, and a control reference temperature value is determined based on the low-pressure value. The control reference temperature value is the converted saturation temperature of the refrigerant when converted to saturated gas. The target adjustment level of the compressor is determined based on the control reference temperature value.

[0010] Optionally, determining the target adjustment level of the compressor based on the control reference temperature value includes: Obtain the target evaporation temperature for cooling, and determine the frequency adjustment parameters based on the converted saturation temperature and the target evaporation temperature for cooling; The target adjustment level is determined based on the frequency adjustment parameters and the frequency adjustment reference table.

[0011] Optionally, determining the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner after exiting the initialization control includes: Collect the evaporator temperature of each indoor unit that has a cooling capacity requirement; A control reference temperature value is determined based on the evaporator temperature, wherein the control reference temperature value is the average value of the temperatures of each evaporator. The target adjustment level of the compressor is determined based on the control reference temperature value.

[0012] Optionally, determining the target adjustment level of the compressor based on the control reference temperature value includes: Based on the control reference temperature value, query the gear adjustment reference chart to determine the image area corresponding to the control reference temperature value; The target adjustment level of the compressor is determined based on the image region.

[0013] Furthermore, to achieve the above objectives, the present invention also proposes a multi-split air conditioner control device, the multi-split air conditioner control device comprising: The information acquisition module is used to acquire the cooling demand information of each indoor unit when the multi-split air conditioner is started in partial heat recovery mode. An initialization module is used to perform initialization control of the compressor of the outdoor unit based on the cooling demand information; The gear selection module is used to determine the target adjustment gear of the compressor based on the 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 from refrigeration to heat the indoor water tank.

[0014] Furthermore, to achieve the above objectives, the present invention also proposes a multi-split air conditioner control device, which includes: a memory, a processor, and a multi-split air conditioner control program stored in the memory and running on the processor. The multi-split air conditioner control program is configured to implement the multi-split air conditioner control method described above.

[0015] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a multi-split air conditioner control program, which, when executed by a processor, implements the multi-split air conditioner control method as described above.

[0016] This invention acquires the cooling demand information of each indoor unit when the multi-split air conditioner starts in partial heat recovery mode; performs initialization control of the outdoor unit's compressor based on the cooling demand information; after exiting the initialization control, determines the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner; and controls the compressor to use waste heat from cooling to heat the indoor water tank based on the target adjustment level. In this way, when the multi-split air conditioner starts in partial heat recovery mode, it achieves initialization control based on the cooling demand of each indoor unit, and then adjusts the compressor level based on the control reference temperature value, thereby utilizing the waste heat from the air conditioner's cooling to heat the indoor water tank for hot water production. This allows for simultaneous air conditioning cooling and hot water production without the need for additional electric auxiliary heating, resulting in greater energy savings. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of a multi-split air conditioner in the hardware operating environment involved in the embodiments of the present invention; Figure 2 This is a flowchart illustrating the first embodiment of the multi-split air conditioner control method of the present invention; Figure 3 This is a schematic diagram illustrating the determination of the indoor unit temperature demand range in one embodiment of the multi-split air conditioner control method of the present invention. Figure 4 This is a flowchart illustrating the second embodiment of the multi-split air conditioner control method of the present invention; Figure 5 This is a schematic diagram of a system structure in one embodiment of the multi-split air conditioner control method of the present invention; Figure 6 This is a flowchart illustrating the third embodiment of the multi-split air conditioner control method of the present invention; Figure 7 This is a schematic diagram of another system structure in one embodiment of the multi-split air conditioner control method of the present invention; Figure 8 This is a comparison diagram of gear adjustment in one embodiment of the multi-split air conditioner control method of the present invention; Figure 9 This is a structural block diagram of the first embodiment of the multi-split air conditioner control device of the present invention.

[0018] Explanation of icon numbers: The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of a multi-split air conditioner in the hardware operating environment involved in the embodiments of the present invention.

[0021] like Figure 1As shown, 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 enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or 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 drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0022] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on multi-split air conditioners and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0023] like Figure 1 As shown, the memory 1005, which serves 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.

[0024] exist Figure 1 In the multi-split air conditioner shown, 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 invention can be set in the multi-split air conditioner. 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 in the embodiment of the present invention.

[0025] This invention provides a control method for a multi-split air conditioner, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of a multi-split air conditioner control method according to the present invention.

[0026] In this embodiment, the multi-split air conditioner control method includes the following steps: Step S10: When the multi-split air conditioner is started in partial heat recovery mode, obtain the cooling demand information of each indoor unit.

[0027] In this embodiment, the executing entity can 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 can also be used, and this embodiment does not impose any limitations on this. For ease of explanation, this embodiment uses a multi-split air conditioner as an example.

[0028] It should be noted that in partial heat recovery mode, when the heat absorbed by the indoor unit through evaporation exceeds the heat required by the water tank to heat water, the excess waste heat is dissipated into the outer air through the outdoor heat exchanger. The unit operates as follows: the water tank is turned on to produce hot water, the indoor unit is in evaporation mode, and the outdoor unit is in condensation mode. At this time, the primary demand of the unit is cooling. Therefore, the unit's capacity target controls the compressor frequency according to the indoor unit's cooling demand. That is, the compressor is initialized based on the cooling demand, and then the compressor frequency is controlled and adjusted according to the corresponding target. The system prioritizes cooling demand. After setting the initial frequency, it compares the cooling demand with the hot water demand. If the cooling demand is greater, the water tank and outdoor unit dissipate heat to produce hot water, utilizing waste heat for cooling. If the hot water demand is greater, waste heat is used to produce hot water. There are two ways to adjust the compressor frequency: one is that the unit has a low-pressure sensor, and the compressor frequency is adjusted by controlling the low-pressure value; the other is that the unit does not have a low-pressure sensor, and the compressor frequency is adjusted based on the indoor unit's cooling effect, i.e., the evaporation temperature.

[0029] It should be understood that, firstly, when the partial heat recovery mode is activated, the cooling demand information of each indoor unit with cooling needs is obtained, including various parameters of the outdoor and indoor units of the multi-split air conditioner, as well as the energy requirements of the indoor units that are cooling.

[0030] In this specific implementation, 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 exhaust pressure; Te, refrigerant saturation temperature corresponding to return gas pressure; Tw, water temperature in the water tank.

[0031] Step S20: Perform initialization control of the outdoor unit's compressor based on the cooling demand information.

[0032] In practice, initial control based on cooling demand information means calculating the frequency to which the compressor needs to be adjusted based on the cooling demand information, and then starting the compressor to run according to the target operating frequency.

[0033] Furthermore, in order to adjust the compressor's initial operating frequency according to 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. Then, the compressor's operating frequency is calculated based on the outdoor unit model coefficient and the indoor energy demand information, thereby performing initial control.

[0034] It should be noted that the calculation method is: Fn = Out_HP * ∑CQ_N, where Fn is the compressor operating frequency code, which corresponds to different frequency values, generally starting from F1 = 16Hz or 20Hz, and increasing upwards in increments of 3~5Hz, i.e., F2 = 20, F3 = 24, etc. Out_HP is the outdoor unit model coefficient, such as 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.

[0035] Furthermore, in order to accurately calculate the indoor energy demand information of all indoor units, the temperature demand range of indoor units with cooling demand is determined based on the cooling demand information, as well as the basic values ​​of the indoor unit models and the fan speed correction coefficient.

[0036] It should be understood that the indoor energy demand information CQ = TQ * HP * K_fan, where TQ is the required temperature of the indoor unit, HP is the base value of the indoor unit model, and K_fan is the indoor fan speed correction coefficient, with specific values ​​as follows: 1. TQ is the range of required temperatures for the indoor cooling unit, such as... Figure 3 The image shown is a reference image for looking up temperature requirement values. Figure 3 Determine the temperature requirement range for each indoor unit. The values ​​are assumed to be determined based on a decreasing curve. The baseline values ​​for different capacity requirement ranges are shown in Table 1 below: Table 1 2. HP is the base value for indoor unit models: 26-unit HP=1.0; 32 / 35-unit HP=1.2; 48 / 53-unit HP=1.5. 3. K_Fan: Indoor unit fan speed correction coefficient, which can be found in Table 2 below (the default setting is high fan speed when using automatic fan).

[0037] Table 2 In this way, indoor energy demand information can be accurately calculated, and thus the frequency of compressor initialization control can be accurately obtained.

[0038] Step S30: After exiting the initialization control, determine the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner.

[0039] In practice, after detecting the exit from 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 conditions. Specifically, it can correspond to the saturation temperature converted from refrigerant to saturated gas and the average value of evaporator temperature.

[0040] It should be noted that after determining the control reference temperature value, the corresponding gear adjustment reference chart and frequency adjustment reference table are consulted based on the control reference temperature value to determine the target adjustment gear.

[0041] Step S40: Adjust the gear according to the target to control the compressor to use the waste heat from refrigeration to heat the indoor water tank.

[0042] It should be understood that after determining the target adjustment level, the compressor is controlled to operate according to the target adjustment level, so that the compressor power can match the energy demand for hot water production, and then the waste heat from the air conditioner's cooling is used to heat the indoor water tank.

[0043] This embodiment enables initial control based on the cooling needs of each indoor unit when the multi-split air conditioner starts in partial heat recovery mode. Then, the compressor speed is adjusted according to the control reference temperature value, thereby using the waste heat from the air conditioner to heat the indoor water tank to produce hot water. This allows for simultaneous air conditioning cooling and hot water production without the need for additional electric auxiliary heating, resulting in greater energy savings.

[0044] refer to Figure 4 , Figure 4 This is a flowchart illustrating a second embodiment of a multi-split air conditioner control method according to the present invention.

[0045] Based on the first embodiment described above, this embodiment of the multi-split air conditioner further includes a low-pressure sensor, which is connected to the outdoor unit. The multi-split air conditioner control method includes the following in step S30: Step S301: Obtain the low pressure value collected by the low pressure sensor, and determine the control reference temperature value based on the low pressure value. The control reference temperature value is the converted saturation temperature of the refrigerant when converted to saturated gas.

[0046] It should be noted that, as Figure 5 The diagram shown is a schematic of the structure of the multi-split air conditioner in this embodiment. A low-pressure sensor is installed at the outdoor unit. The low-pressure sensor collects the low-pressure value of the refrigerant and then converts the low-pressure value into the converted saturation temperature of the refrigerant in saturated gas state, which is used as the control reference temperature value.

[0047] Step S302: Determine the target adjustment level of the compressor based on the control reference temperature value.

[0048] It should be understood that after determining the conversion saturation temperature, the target evaporation temperature for cooling is then obtained. Based on the target evaporation temperature and the control reference temperature value, the frequency adjustment parameters are calculated, and finally, the target adjustment level is determined by consulting the frequency adjustment reference table.

[0049] Furthermore, to determine the target adjustment level, the target evaporation temperature for cooling is first obtained again, with a recommended value of 9℃ and a range of 5~12℃. The frequency adjustment parameter is calculated as follows: X = Te_TARGET - Te, where Te_TARGET is the target evaporation temperature for cooling, and Te is the control reference temperature value.

[0050] In practice, the frequency adjustment reference table is shown in Table 3.

[0051] Table 3 The unit of the action cycle is seconds.

[0052] This embodiment calculates the frequency adjustment parameters by using the control reference temperature value and the target evaporation temperature in the calculation formula. Then, it determines whether to increase or decrease the gear by consulting the frequency adjustment lookup table, thereby accurately determining the target adjustment gear. This makes the compressor frequency adjustment based on the low pressure value of the refrigerant more accurate.

[0053] refer to Figure 6 , Figure 6 This is a flowchart illustrating a third embodiment of a multi-split air conditioner control method according to the present invention.

[0054] Based on the first embodiment described above, the multi-split air conditioner control method includes the following in step S30: Step S31: Collect the evaporator temperature of each indoor unit with cooling capacity requirements.

[0055] It should be noted that the structure in this embodiment is as follows: Figure 7 As shown, the compressor frequency is corrected based on the average value of the evaporator temperature T2 of each indoor unit that has a cooling capacity requirement (excluding those in standby, mode conflict, or cooling to the set temperature).

[0056] It should be understood that the temperature of the evaporator of each indoor unit with cooling demand should be collected first.

[0057] Step S32: Determine a control reference temperature value based on the evaporator temperature, wherein the control reference temperature value is the average value of the temperatures of each evaporator.

[0058] It should be understood that after obtaining the evaporator temperature of each indoor unit with cooling demand, the average value is then calculated and used as the control reference temperature value.

[0059] Step S33: Determine the target adjustment level of the compressor based on the control reference temperature value.

[0060] In practice, the target adjustment level of the compressor is determined based on the control reference temperature value. By consulting the adjustment chart, the adjustment action of the compressor can be determined, which can be to keep it unchanged, or to increase or decrease the level by one gear.

[0061] Furthermore, in order to accurately determine the target adjustment gear, first consult the gear adjustment reference chart based on the control reference temperature value. The gear adjustment reference chart is as follows: Figure 8 Where T2_COOL_UP is the limit temperature of the frequency adjustment rising zone, with a recommended value of 9℃ and a range of 7~12℃; T2_COOL_LOW is the limit temperature of the frequency adjustment falling zone, with a recommended value of 7℃ and a range of 5~8℃; Cool_AdjTime_EE is the adjustment period, with a recommended value of 120s and a range of 60~300s.

[0062] It should be noted that there are three ways to confirm the target adjustment level, each corresponding to a different position of the control reference temperature value on the adjustment chart, as detailed below: 1) If the gear is in the descending zone, the current gear will decrease by 1 gear for every Cool_AdjTime_EE until F1 is reached; 2) If it is in the rising zone, it will rise by 1 level for every Cool_AdjTime_EE in the current level until the maximum value of the correction is allowed.

[0063] 3) If in the holding zone, the current gear frequency will be maintained.

[0064] This embodiment calculates the target adjustment level based on the average temperature of the evaporator of the indoor unit, allowing the compressor output to be flexibly adjusted according to the energy needs of each indoor unit. This enables the use of waste heat to produce hot water, reducing the use of electric auxiliary heating and making it more energy-efficient.

[0065] Furthermore, this embodiment of the invention also proposes a storage medium storing a multi-split air conditioner control program, which, when executed by a processor, implements the steps of the multi-split air conditioner control method described above.

[0066] Since this storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0067] Reference Figure 8 , Figure 8 This is a structural block diagram of the first embodiment of the multi-split air conditioner control device of the present invention.

[0068] like Figure 8 As shown, the multi-split air conditioner control device proposed in this embodiment of the invention includes: 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 partial heat recovery mode.

[0069] In this embodiment, the executing entity can 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 can also be used, and this embodiment does not impose any limitations on this. For ease of explanation, this embodiment uses a multi-split air conditioner as an example.

[0070] It should be noted that in partial heat recovery mode, when the heat absorbed by the indoor unit through evaporation exceeds the heat required by the water tank to heat water, the excess waste heat is dissipated into the outer air through the outdoor heat exchanger. The unit operates as follows: the water tank is turned on to produce hot water, the indoor unit is in evaporation mode, and the outdoor unit is in condensation mode. At this time, the primary demand of the unit is cooling. Therefore, the unit's capacity target controls the compressor frequency according to the indoor unit's cooling demand. That is, the compressor is initialized based on the cooling demand, and then the compressor frequency is controlled and adjusted according to the corresponding target. The system prioritizes cooling demand. After setting the initial frequency, it compares the cooling demand with the hot water demand. If the cooling demand is greater, the water tank and outdoor unit dissipate heat to produce hot water, utilizing waste heat for cooling. If the hot water demand is greater, waste heat is used to produce hot water. There are two ways to adjust the compressor frequency: one is that the unit has a low-pressure sensor, and the compressor frequency is adjusted by controlling the low-pressure value; the other is that the unit does not have a low-pressure sensor, and the compressor frequency is adjusted based on the indoor unit's cooling effect, i.e., the evaporation temperature.

[0071] It should be understood that, firstly, when the partial heat recovery mode is activated, the cooling demand information of each indoor unit with cooling needs is obtained, including various parameters of the outdoor and indoor units of the multi-split air conditioner, as well as the energy requirements of the indoor units that are cooling.

[0072] In this specific implementation, 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 exhaust pressure; Te, refrigerant saturation temperature corresponding to return gas pressure; Tw, water temperature in the water tank.

[0073] The initialization module 20 is used to perform initialization control of the compressor of the outdoor unit according to the cooling demand information.

[0074] In practice, initial control based on cooling demand information means calculating the frequency to which the compressor needs to be adjusted based on the cooling demand information, and then starting the compressor to run according to the target operating frequency.

[0075] Furthermore, in order to adjust the compressor's initial operating frequency according to 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. Then, the compressor's operating frequency is calculated based on the outdoor unit model coefficient and the indoor energy demand information, thereby performing initial control.

[0076] It should be noted that the calculation method is: Fn = Out_HP * ∑CQ_N, where Fn is the compressor operating frequency code, which corresponds to different frequency values, generally starting from F1 = 16Hz or 20Hz, and increasing upwards in increments of 3~5Hz, i.e., F2 = 20, F3 = 24, etc. Out_HP is the outdoor unit model coefficient, such as 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.

[0077] Furthermore, in order to accurately calculate the indoor energy demand information of all indoor units, the temperature demand range of indoor units with cooling demand is determined based on the cooling demand information, as well as the basic values ​​of the indoor unit models and the fan speed correction coefficient.

[0078] It should be understood that the indoor energy demand information CQ = TQ * HP * K_fan, where TQ is the required temperature of the indoor unit, HP is the base value of the indoor unit model, and K_fan is the indoor fan speed correction coefficient, with specific values ​​as follows: 1. TQ is the range of required temperatures for the indoor cooling unit, such as... Figure 3 The image shown is a reference image for looking up temperature requirement values. Figure 3 Determine the temperature requirement range for each indoor unit. The values ​​are assumed to be determined based on a decreasing curve. The baseline values ​​for different capacity requirement ranges are shown in Table 1 below: Table 1 2. HP is the base value for indoor unit models: 26-unit HP=1.0; 32 / 35-unit HP=1.2; 48 / 53-unit HP=1.5. 3. K_Fan: Indoor unit fan speed correction coefficient, which can be found in Table 2 below (the default setting is high fan speed when using automatic fan).

[0079] Table 2 In this way, indoor energy demand information can be accurately calculated, and thus the frequency of compressor initialization control can be accurately obtained.

[0080] The gear determination module 30 is used to determine the target adjustment gear of the compressor based on the control reference temperature value of the multi-split air conditioner after exiting the initialization control.

[0081] In practice, after detecting the exit from 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 conditions. Specifically, it can correspond to the saturation temperature calculated by converting the refrigerant properties to saturated gaseous state, and the average value of the evaporator temperature.

[0082] It should be noted that after determining the control reference temperature value, the corresponding gear adjustment reference chart and frequency adjustment reference table are consulted based on the control reference temperature value to determine the target adjustment gear.

[0083] 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 from refrigeration to heat the indoor water tank.

[0084] It should be understood that after determining the target adjustment level, the compressor is controlled to operate according to the target adjustment level, so that the compressor power can match the energy demand for hot water production, and then the waste heat from the air conditioner's cooling is used to heat the indoor water tank.

[0085] This embodiment enables initial control based on the cooling demand of each indoor unit when the multi-split air conditioner starts in partial heat recovery mode. Then, the compressor speed is adjusted according to the control reference temperature value, thereby utilizing the waste heat from the air conditioner's cooling to heat the indoor water tank for hot water production. This allows for simultaneous air conditioning cooling and hot water production without the need for additional electric auxiliary heating, resulting in greater energy savings. It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0086] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0087] In addition, for technical details not described in detail in this embodiment, please refer to the multi-split air conditioner control method provided in any embodiment of the present invention, which will not be repeated here.

[0088] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0089] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0090] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0091] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a multi-split air conditioner, characterized in that, The multi-split air conditioner control method is applied to a multi-split air conditioner, which includes an indoor water tank, an outdoor unit, and multiple indoor units. The outdoor unit is connected to the indoor water tank, and each indoor unit is connected to the outdoor unit. The multi-split air conditioner control method includes: When the multi-split air conditioner is started in partial heat recovery mode, the cooling demand information of each indoor unit is obtained; Based on the cooling demand information, determine the outdoor unit model coefficient, as well as the temperature demand range information, indoor unit model base value, and wind speed correction coefficient for each indoor unit with cooling demand. Based on the temperature demand range information, the basic value of the indoor unit model, and the wind speed correction coefficient, determine the indoor energy demand information of the indoor unit with cooling demand; The operating frequency of the compressor is determined based on the outdoor unit model coefficient and the internal energy demand information; The compressor of the outdoor unit is initialized and controlled according to the operating frequency. After exiting the initialization control, the target adjustment level of the compressor is determined according to the control reference temperature value of the multi-split air conditioner. The control reference temperature value is the converted saturation temperature of the refrigerant saturated gas state based on the low pressure value of the refrigerant or the average value of the temperature of each evaporator. According to the target, the compressor is adjusted to use the waste heat from refrigeration to heat the indoor water tank.

2. The multi-split air conditioner control method as described in claim 1, characterized in that, The multi-split air conditioner also includes a low-pressure sensor, which is connected to the outdoor unit. After exiting the initialization control, determining the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner includes: The low-pressure value collected by the low-pressure sensor is obtained, and a control reference temperature value is determined based on the low-pressure value. The control reference temperature value is the converted saturation temperature of the refrigerant when converted to saturated gas. The target adjustment level of the compressor is determined based on the control reference temperature value.

3. The multi-split air conditioner control method as described in claim 2, characterized in that, Determining the target adjustment level of the compressor based on the control reference temperature value includes: Obtain the target evaporation temperature for cooling, and determine the frequency adjustment parameters based on the converted saturation temperature and the target evaporation temperature for cooling; The target adjustment level is determined based on the frequency adjustment parameters and the frequency adjustment reference table.

4. The multi-split air conditioner control method as described in claim 1, characterized in that, After exiting the initialization control, determining the target adjustment level of the compressor based on the control reference temperature value of the multi-split air conditioner includes: Collect the evaporator temperature of each indoor unit that has a cooling capacity requirement; A control reference temperature value is determined based on the evaporator temperature, wherein the control reference temperature value is the average value of the temperatures of each evaporator. The target adjustment level of the compressor is determined based on the control reference temperature value. The process of determining the target adjustment level includes: When the control reference temperature value is higher than the rising zone limit temperature of the frequency adjustment, the target adjustment level is determined to be one level higher for each adjustment cycle. When the control reference temperature value is lower than the temperature limit of the frequency adjustment drop zone, the target adjustment level is determined to be one level lower than the current level after each adjustment cycle. When the control reference temperature value is between the temperature limit of the falling zone and the temperature limit of the rising zone, the target adjustment level is determined to maintain the current level.

5. The multi-split air conditioner control method as described in claim 4, characterized in that, Determining the target adjustment level of the compressor based on the control reference temperature value includes: Based on the control reference temperature value, query the gear adjustment reference chart to determine the image area corresponding to the control reference temperature value; The target adjustment level of the compressor is determined based on the image region.

6. A control device for a multi-split air conditioner, characterized in that, The multi-split air conditioner control device includes: The information acquisition module is used to acquire the cooling demand information of each indoor unit when the multi-split air conditioner is started in partial heat recovery mode. The initialization module is used to determine the outdoor unit model coefficient, the temperature requirement range, the basic indoor unit model value, and the fan speed correction coefficient for each indoor unit with cooling demand based on the cooling demand information; determine the indoor energy demand information for the indoor units with cooling demand based on the temperature requirement range, the basic indoor unit model value, and the fan speed correction coefficient; determine the compressor operating frequency based on the outdoor unit model coefficient and the indoor energy demand information; and perform initialization control of the outdoor unit compressor based on the operating frequency. The gear setting determination module is used to determine the target adjustment gear of the compressor based on the control reference temperature value of the multi-split air conditioner after exiting the initialization control. The control reference temperature value is the converted saturation temperature of the refrigerant saturated gas state based on the low pressure value of the refrigerant or the average value of the temperatures of each evaporator. The water tank heating module is used to adjust the gear according to the target to control the compressor to use the waste heat from refrigeration to heat the indoor water tank.

7. A multi-split air conditioner, characterized in that, 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, the multi-split air conditioner control program being configured to implement the multi-split air conditioner control method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium stores a multi-split air conditioner control program, which, when executed by a processor, implements the multi-split air conditioner control method as described in any one of claims 1 to 5.

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