Heat recovery air conditioning unit, control method and device thereof, and storage medium

Abstract

This invention discloses a heat recovery air conditioning unit and its control method, device, and storage medium, belonging to the field of air conditioning technology. When the heat recovery air conditioning unit meets the overall electrical control overheating protection conditions, this invention detects the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit; and adjusts the operating frequency of the compressor of the heat recovery air conditioning unit based on these parameters. In this way, when the heat recovery air conditioning unit meets the electrical control overheating protection conditions, the compressor operating frequency is adjusted while simultaneously considering the outlet water temperature of the water tank and the ambient temperature of the indoor unit, resulting in more accurate electrical control overheating and more efficient and reliable unit operation.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a heat recovery air conditioning unit and its control method, device and storage medium. Background Technology

[0002] With the increasing popularity of air conditioners, the number of household air conditioners is also gradually increasing. When an air conditioner is cooling, the heat generated by the condenser needs to be released. However, hot water for bathing needs to be supplied by a boiler or water heater. This results in both heat release and energy consumption, leading to energy waste and failing to meet energy conservation requirements. In recent years, heat recovery air conditioning units have developed rapidly to address this energy waste problem. However, units with multiple pipes supporting multiple indoor units and water tanks are still relatively rare. Conventional electrical control and protection schemes generally use ordinary air conditioning heating control with ambient temperature frequency limiting.

[0003] For the electrical control overheating protection in heating + hot water production modes, existing technologies directly adopt the ambient temperature control method used in air conditioning heating, without considering the heat exchange efficiency of the medium water when a water tank is installed, or the user's demand for higher outlet water temperatures. Directly adopting the ambient temperature control method used in air conditioning heating affects the refrigerant condensation temperature, causing the compressor to stop prematurely before the water temperature is high enough, thus requiring the electric heater to intervene earlier and increasing power consumption. Furthermore, due to the different heat exchange efficiencies of water and air, the ambient temperature can be appropriately increased in hot water production mode alone.

[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 heat recovery air conditioning unit and its control method, device and storage medium, which aims to solve the technical problem that the existing electronic control heating protection method does not take into account the heat exchange effect of the medium water when equipped with a water tank and the user's demand for high outlet water temperature.

[0006] To achieve the above objectives, the present invention provides a control method for a heat recovery air conditioning unit. The heat recovery air conditioning unit includes multiple indoor units, a water tank, and an outdoor unit. The water tank is connected to the outdoor unit, and each indoor unit is connected to the outdoor unit.

[0007] The control method for the heat recovery air conditioning unit includes:

[0008] When the heat recovery air conditioning unit meets the conditions for whole-unit electronic control heating protection, the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank and the ambient temperature of the indoor unit are detected.

[0009] The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature.

[0010] Optionally, before detecting the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit when the heat recovery air conditioning unit meets the overall electronic control heating protection conditions, the method further includes:

[0011] When the water tank is turned on and there is energy demand, at least one indoor unit is turned on and there is energy demand, and the heat recovery air conditioning unit is operating in a mixed heating mode or a separate hot water mode, the heat recovery air conditioning unit is determined to meet the whole unit's electrical control heating protection conditions.

[0012] Optionally, adjusting the operating frequency of the compressor of the heat recovery air conditioning unit based on the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature includes:

[0013] When the ambient temperature is lower than a preset temperature threshold, the temperature range of the outdoor ambient temperature sensor is determined.

[0014] The operating frequency limit is determined based on the temperature range of the temperature sensor.

[0015] The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

[0016] Optionally, adjusting the operating frequency of the compressor of the heat recovery air conditioning unit based on the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature includes:

[0017] When the ambient temperature is lower than a preset temperature threshold, the water tank outlet temperature range in which the outlet water temperature is located is determined.

[0018] The operating frequency limit is determined based on the water outlet temperature range of the water tank.

[0019] The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

[0020] Optionally, adjusting the operating frequency of the compressor of the heat recovery air conditioning unit based on the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature includes:

[0021] When the ambient temperature is lower than a preset temperature threshold, the temperature range of the outdoor ambient temperature sensor and the water tank outlet temperature are determined.

[0022] The operating frequency limit is determined based on the temperature range of the temperature sensor and the water outlet temperature range of the water tank.

[0023] The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

[0024] Optionally, after adjusting the operating frequency of the compressor of the heat recovery air conditioning unit based on the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature, the method further includes:

[0025] When the heat recovery air conditioning unit meets the overheat protection stop condition, the adjustment of the compressor operating frequency of the heat recovery air conditioning unit is stopped, and the electronic overheat protection control is exited.

[0026] Optionally, before stopping the adjustment of the compressor operating frequency of the heat recovery air conditioning unit and exiting the electronically controlled heating protection control when the heat recovery air conditioning unit meets the heating protection stop condition, the method further includes:

[0027] Upon receiving a remote shutdown command, the heat recovery air conditioning unit is determined to meet the conditions for stopping the overheating protection.

[0028] When the water tank is found to be without power, the heat recovery air conditioning unit is determined to meet the heating protection shutdown condition;

[0029] When it is detected that there is no energy demand in each indoor unit, it is determined that the heat recovery air conditioning unit meets the heating protection shutdown condition;

[0030] When the heat recovery air conditioning unit is detected to have entered defrosting mode or oil return mode, it is determined that the heat recovery air conditioning unit meets the conditions for stopping the overheating protection.

[0031] Furthermore, to achieve the above objectives, the present invention also proposes a heat recovery air conditioning unit control device, the heat recovery air conditioning unit control device comprising:

[0032] The data detection module is used to detect the outdoor ambient temperature sensor of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit when the heat recovery air conditioning unit meets the whole unit electronic control heating protection conditions.

[0033] The operation adjustment module is used to adjust the operating frequency of the compressor of the heat recovery air conditioning unit according to the outdoor ambient temperature sensor temperature, the outlet water temperature and the ambient temperature.

[0034] Furthermore, to achieve the above objectives, the present invention also proposes a heat recovery air conditioning unit, which includes: a memory, a processor, and a heat recovery air conditioning unit control program stored in the memory and running on the processor, wherein the heat recovery air conditioning unit control program is configured to implement the heat recovery air conditioning unit control method as described above.

[0035] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a heat recovery air conditioning unit control program, which, when executed by a processor, implements the heat recovery air conditioning unit control method as described above.

[0036] This invention, when the heat recovery air conditioning unit meets the overall electrical control overheating protection conditions, detects the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit; and adjusts the operating frequency of the compressor of the heat recovery air conditioning unit based on the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature. In this way, while the heat recovery air conditioning unit meets the overall electrical control overheating protection conditions, the compressor operating frequency is adjusted by simultaneously considering the outlet water temperature of the water tank and the ambient temperature of the indoor unit, resulting in more accurate electrical control over heat generation and more efficient and reliable unit operation. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the heat recovery air conditioning unit in the hardware operating environment involved in the embodiments of the present invention;

[0038] Figure 2 This is a flowchart illustrating the first embodiment of the heat recovery air conditioning unit control method of the present invention;

[0039] Figure 3 This is a schematic diagram of the system structure in one embodiment of the heat recovery air conditioning unit control method of the present invention;

[0040] Figure 4 This is a frequency value comparison diagram in one embodiment of the heat recovery air conditioning unit control method of the present invention;

[0041] Figure 5 This is a schematic diagram of the water tank adjustment method in one embodiment of the heat recovery air conditioning unit control method of the present invention;

[0042] Figure 6 This is a schematic diagram of the combined adjustment method in one embodiment of the heat recovery air conditioning unit control method of the present invention.

[0043] Figure 7 This is a flowchart illustrating the second embodiment of the heat recovery air conditioning unit control method of the present invention;

[0044] Figure 8 This is a schematic diagram of the ambient temperature adjustment method in one embodiment of the heat recovery air conditioning unit control method of the present invention;

[0045] Figure 9 This is a flowchart illustrating the third embodiment of the heat recovery air conditioning unit control method of the present invention;

[0046] Figure 10This is a structural block diagram of the first embodiment of the heat recovery air conditioning unit control device of the present invention.

[0047] Explanation of icon numbers:

[0048]

[0049] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] 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.

[0051] Reference Figure 1 , Figure 1 This is a schematic diagram of the heat recovery air conditioning unit structure in the hardware operating environment of the embodiment of the present invention.

[0052] like Figure 1 As shown, the heat recovery air conditioning unit 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 or 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.

[0053] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the heat recovery air conditioning unit and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0054] 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 heat recovery air conditioning unit control program.

[0055] exist Figure 1In the heat recovery air conditioning unit 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 heat recovery air conditioning unit of the present invention can be set in the heat recovery air conditioning unit, and the heat recovery air conditioning unit calls the heat recovery air conditioning unit control program stored in the memory 1005 through the processor 1001 and executes the heat recovery air conditioning unit control method provided in the embodiment of the present invention.

[0056] This invention provides a control method for a heat recovery air conditioning unit, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of a heat recovery air conditioning unit control method according to the present invention.

[0057] In this embodiment, the heat recovery air conditioning unit control method includes the following steps:

[0058] Step S10: When the heat recovery air conditioning unit meets the whole unit's electronic control heating protection conditions, detect the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit.

[0059] In this embodiment, the executing entity can be the heat recovery air conditioning unit, 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 heat recovery air conditioning unit as an example.

[0060] It should be noted that the whole machine's electronic control overheating protection condition refers to the pre-set condition for determining whether to adjust the compressor's operating frequency to prevent excessive overheating of the whole machine's electronic control system.

[0061] In specific implementation, the letters in this embodiment are defined as follows: T1, ambient temperature; T1_j, the preset limit value of indoor ambient temperature T1 when running the j-th high frequency; T4, outdoor ambient temperature sensor; T4_i, the i-th level outdoor ambient temperature, set T4_max=T4_1; T4_max, the maximum T4 that the compressor can operate at, if the temperature exceeds this, the compressor will stop directly; T4_min, the minimum outdoor ambient temperature that the unit can operate at; TW_in, water tank inlet temperature; TW_out, water tank outlet temperature; TW_out_j, the water tank outlet temperature required to run the j-th high frequency when T4 is below 0℃.

[0062] It should be understood that, as Figure 3The diagram shown illustrates the system structure of this embodiment. In this heat recovery air conditioning unit, the electronic control system employs a refrigerant pipe heat dissipation structure. The evaporation temperature, condensation temperature, and T4 temperature directly affect the heat dissipation effect of the electronic control IPM module. This invention aims to achieve efficient and reliable control and protection against overheating of the electronic control IPM module through the linkage control of T4 and TW_out. The outdoor unit's outdoor ambient temperature sensor is used to detect the outdoor ambient temperature, and then the water tank outlet temperature is collected, combined with the corresponding ambient temperature of the indoor unit.

[0063] Furthermore, to accurately define the conditions for the whole unit's electrical control overheating protection, before step S10, it is necessary to confirm that: 1. The heating + hot water production mode is activated, or the hot water production mode is activated; the water tank has energy demand; the indoor unit of the air conditioner has energy demand; the unit is running normally and controlled according to the normal control method. At this time, it is determined that the conditions for the whole unit's electrical control overheating protection are met.

[0064] It should be noted that after startup, initialization is required. First, initialization tests are performed: outdoor ambient temperature T4, water tank outlet pipe temperature TW_out, and indoor unit ambient temperature T1 are measured.

[0065] It should be understood that the water tank electrical control heating protection can only be activated when the following conditions are met simultaneously: a) the water tank is turned on and running, and the water tank has power requirements; b) the indoor unit is turned on and running, and the indoor unit has power requirements.

[0066] In this way, the conditions for accurately limiting the overheating protection of the whole machine's electronic control system are achieved.

[0067] Step S20: Adjust the operating frequency of the compressor of the heat recovery air conditioning unit according to the outdoor ambient temperature sensor temperature, the outlet water temperature and the ambient temperature.

[0068] In practice, the operating frequency of the compressor can be determined by the temperature range of the outdoor ambient temperature sensor, the water tank outlet temperature range, or by combining the temperature range of the temperature sensor and the water tank outlet temperature range.

[0069] Furthermore, for domestic water use, when the outdoor ambient temperature is high, the inlet water temperature is also high, and the required hot water energy for the water tank is relatively small, which can be met within the normal frequency range. However, when the ambient temperature is near 0℃, or even below -15℃, it is necessary to consider operating at extreme frequencies. At this point, the frequency is high, the current is large, and the electrical control system generates more heat, requiring consideration of the pressure difference and pressure ratio between the evaporation and condensation pressures. To adjust the compressor based on the outlet water temperature of the water tank, the outlet water temperature range of the water tank must first be determined.

[0070] It should be understood that the control method after determining the outlet water temperature range is as follows: when T4 is less than 0℃, the maximum operable compressor frequency is determined based on the value of TW_out. If the measured values ​​of TW_out_21~TW_out_25 are less than the set value TW_out_j, then the compressor can operate as follows. Figure 4 The corresponding frequency value for the specified interval; otherwise, it can only operate at the maximum frequency of the interval where T4=0℃. The recommended setting for TW_out_j is between 40~60℃, preferably 50~55℃. For example... Figure 5 The flowchart shown is for this method.

[0071] In this way, the operating frequency of the compressor can be adjusted by the outlet water temperature of the water tank.

[0072] Furthermore, by simultaneously linking T4, T1, and TW_out, the heating and hot water needs can be met more precisely, while ensuring the reliability of the electronically controlled heating system. For example... Figure 6 The flowchart shown is for this method.

[0073] It should be noted that when T4 is less than 0℃: 1. Determine the range of the measured value of TW_out to determine the maximum operable compressor frequency. If the measured values ​​of TW_out_21 to TW_out_25 are less than the set value TW_out_j, then the compressor can operate. Figure 4 The corresponding frequency value must be within the specified range; otherwise, it can only operate at the maximum frequency within the range of T4=0℃. The recommended setting value TW_out_j is between 40~60℃, preferably 50~55℃. 2. Determine the range of the measured value of T1 to determine the maximum operable compressor frequency. If the measured values ​​of T1_21~T1_25 are less than the set value T1_j, then operation is possible. Figure 4 The corresponding frequency range is F21~F25; otherwise, it can only operate at the maximum frequency of the range T4=0℃. The recommended setting value T1_j is between 18~26℃, preferably 20~22℃. When at least one of the above conditions is met, the corresponding operating frequency is executed.

[0074] In this embodiment, while the heat recovery air conditioning unit meets the overall electrical control heating protection conditions, the operating frequency of the compressor is adjusted by considering both the outlet water temperature of the water tank and the ambient temperature of the indoor unit. This results in more accurate control of electrical heating reliability and more efficient and reliable unit operation.

[0075] refer to Figure 7 , Figure 7 This is a flowchart illustrating a second embodiment of a heat recovery air conditioning unit control method according to the present invention.

[0076] Based on the first embodiment described above, the heat recovery air conditioning unit control method of this embodiment includes the following in step S20:

[0077] Step S201: When the ambient temperature is lower than the preset temperature threshold, determine the temperature range of the outdoor ambient temperature sensor.

[0078] It should be noted that the preset temperature threshold refers to the temperature threshold set in advance to determine whether the ambient temperature meets the conditions.

[0079] It should be understood that, firstly, the measured temperature of T4 is detected to determine the temperature range within which T4 exists. Then, frequency limiting control logic is implemented based on the temperature of T4, such as... Figure 4 The left vertical axis represents the T4 temperature during frequency increase. The recommended value for T4_max is between 40 and 46℃, preferably 44℃. T4 is divided into N intervals, from the lowest temperature T4_min to the highest temperature T4_max within the applicable operating range of the heat recovery unit. The intervals can be evenly divided, i.e., the difference between each interval T4_i+1 and T4_i is (T4_max - T4_min) / N. The recommended value for N is 10 to 20, preferably 15. Furthermore, the step size for each temperature interval can be inconsistent, ranging from 2 to 8℃. For temperature intervals closer to T4_max, a smaller step size is recommended, preferably 3 to 6℃. The right vertical axis represents the T4 temperature during frequency decrease. The recommended value is Δt = 1 to 3℃ lower than the corresponding frequency increase temperature, preferably 2℃. Next, the measured value of the indoor unit's ambient temperature T1 is detected to determine the temperature range of T1. When T4 is less than 0℃, the water tank and indoor unit require a large capacity, and the compressor needs to run at a high frequency. However, at this time, there are problems such as large pressure difference and pressure ratio, large current, and large IPM heat generation. This solution uses the ambient temperature T1 of the indoor unit to control the maximum operating frequency.

[0080] Step S202: Determine the operating frequency limit based on the temperature range of the temperature sensor.

[0081] In practical implementation, the selection process for the operating frequency limit is as follows: Figure 8 As shown, when T4 is less than 0℃, the maximum operating compressor frequency is determined based on the value of T1. If the measured values ​​of T1_21 to T1_25 are less than the set value T1_j, then the compressor can operate. Figure 4 The corresponding frequency value is F21~F25; otherwise, it can only operate at the maximum frequency of the interval T4=0℃. The recommended setting value T1_j is between 18~26℃, and preferably, 20~22℃.

[0082] Step S203: Adjust the operating frequency of the compressor of the heat recovery air conditioning unit according to the operating frequency limit.

[0083] It should be noted that after the operating frequency limit is determined, the frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

[0084] This embodiment achieves reliable operation of the heat recovery heating + hot water production mode through the linkage control of T4 temperature and T1 temperature.

[0085] refer to Figure 9 , Figure 9 This is a flowchart illustrating the third embodiment of a heat recovery air conditioning unit control method of the present invention.

[0086] Based on the first embodiment described above, the heat recovery air conditioning unit control method of this embodiment further includes, after step S20:

[0087] Step S21: When the heat recovery air conditioning unit meets the overheating protection stop condition, stop adjusting the operating frequency of the compressor of the heat recovery air conditioning unit and exit the electronic overheating protection control.

[0088] It should be noted that the overheat protection shutdown condition consists of multiple conditions. When the heat recovery air conditioning unit meets at least one of these conditions, the adjustment of the compressor operating frequency of the heat recovery air conditioning unit will be stopped.

[0089] Furthermore, in order to accurately define the conditions for stopping the overheating protection, the following four situations are considered to meet the conditions for stopping the overheating protection: 1. When a remote control shutdown command is received; 2. When the water tank is not in use; 3. When all indoor units are not in use; 4. When entering the defrosting and oil return control mode.

[0090] This embodiment accurately defines the exit conditions for the overheat protection mode, enabling the overheat protection mode to be exited in a timely manner to prevent it from affecting the normal operation of the air conditioner.

[0091] Furthermore, this embodiment of the invention also proposes a storage medium storing a heat recovery air conditioning unit control program, which, when executed by a processor, implements the steps of the heat recovery air conditioning unit control method described above.

[0092] 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.

[0093] Reference Figure 10 , Figure 10 This is a structural block diagram of the first embodiment of the heat recovery air conditioning unit control device of the present invention.

[0094] like Figure 10 As shown, the heat recovery air conditioning unit control device proposed in this embodiment of the invention includes:

[0095] The data detection module 10 is used to detect the outdoor ambient temperature sensor of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit when the heat recovery air conditioning unit meets the whole unit's electronic control heating protection conditions.

[0096] In this embodiment, the executing entity can be the heat recovery air conditioning unit, 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 heat recovery air conditioning unit as an example.

[0097] It should be noted that the whole machine's electronic control overheating protection condition refers to the pre-set condition for determining the adjustment of the compressor's operating frequency.

[0098] In specific implementation, the letters in this embodiment are defined as follows: T1, ambient temperature; T1_j, the preset limit value of indoor ambient temperature T1 when running the j-th high frequency; T4, outdoor ambient temperature sensor; T4_i, the i-th level outdoor ambient temperature, set T4_max=T4_1; T4_max, the maximum T4 that the compressor can operate at, if the temperature exceeds this, the compressor will stop directly; T4_min, the minimum outdoor ambient temperature that the unit can operate at; TW_in, water tank inlet temperature; TW_out, water tank outlet temperature; TW_out_j, the water tank outlet temperature required to run the j-th high frequency when T4 is below 0℃.

[0099] It should be understood that, as Figure 3 The diagram shown illustrates the system structure of this embodiment. In this heat recovery air conditioning unit, the electronic control system employs a refrigerant pipe heat dissipation structure. The evaporation temperature, condensation temperature, and T4 temperature directly affect the heat dissipation effect of the electronic control IPM module. This invention aims to achieve efficient and reliable control and protection against overheating of the electronic control IPM module through the linkage control of T4 and TW_out. The outdoor unit's outdoor ambient temperature sensor is used to detect the outdoor ambient temperature, and then the water tank outlet temperature is collected, combined with the corresponding ambient temperature of the indoor unit.

[0100] Furthermore, to accurately define the conditions for the whole unit's electrical control overheating protection, before step S10, it is necessary to confirm that: 1. The heating + hot water production mode is activated, or the hot water production mode is activated; the water tank has energy demand; the indoor unit of the air conditioner has energy demand; the unit is running normally and controlled according to the normal control method. At this time, it is determined that the conditions for the whole unit's electrical control overheating protection are met.

[0101] It should be noted that after startup, initialization is required. First, initialization tests are performed: outdoor ambient temperature T4, water tank outlet pipe temperature TW_out, and indoor unit ambient temperature T1 are measured.

[0102] It should be understood that the water tank electrical control heating protection can only be activated when the following conditions are met simultaneously: a) the water tank is turned on and running, and the water tank has power requirements; b) the indoor unit is turned on and running, and the indoor unit has power requirements.

[0103] In this way, the conditions for accurately limiting the overheating protection of the whole machine's electronic control system are achieved.

[0104] The operation adjustment module 20 is used to adjust the operating frequency of the compressor of the heat recovery air conditioning unit according to the outdoor ambient temperature sensor temperature, the outlet water temperature and the ambient temperature.

[0105] In practice, the operating frequency of the compressor can be determined by the temperature range of the outdoor ambient temperature sensor, the water tank outlet temperature range, or by combining the temperature range of the temperature sensor and the water tank outlet temperature range.

[0106] Furthermore, for domestic water use, when the outdoor ambient temperature is high, the inlet water temperature is also high, and the required hot water energy for the water tank is relatively small, which can be met within the normal frequency range. However, when the ambient temperature is near 0℃, or even below -15℃, it is necessary to consider operating at extreme frequencies. At this point, the frequency is high, the current is large, and the electrical control system generates more heat, requiring consideration of the pressure difference and pressure ratio between the evaporation and condensation pressures. To adjust the compressor based on the outlet water temperature of the water tank, the outlet water temperature range of the water tank must first be determined.

[0107] It should be understood that the control method after determining the outlet water temperature range is as follows: when T4 is less than 0℃, the maximum operable compressor frequency is determined based on the value of TW_out. If the measured values ​​of TW_out_21~TW_out_25 are less than the set value TW_out_j, then the compressor can operate as follows. Figure 4 The corresponding frequency value for the specified interval; otherwise, it can only operate at the maximum frequency of the interval where T4=0℃. The recommended setting for TW_out_j is between 40~60℃, preferably 50~55℃. For example... Figure 5 The flowchart shown is for this method.

[0108] In this way, the operating frequency of the compressor can be adjusted by the outlet water temperature of the water tank.

[0109] Furthermore, by simultaneously linking T4, T1, and TW_out, the heating and hot water needs can be met more precisely, while ensuring the reliability of the electronically controlled heating system. For example... Figure 6 The flowchart shown is for this method.

[0110] It should be noted that when T4 is less than 0℃: 1. Determine the range of the measured value of TW_out to determine the maximum operable compressor frequency. If the measured values ​​of TW_out_21 to TW_out_25 are less than the set value TW_out_j, the compressor can operate at the frequency value of the corresponding range shown in the figure below. Otherwise, it can only operate at the maximum frequency of the range where T4=0℃. The set value TW_out_j is recommended to be between 40~60℃, preferably 50~55℃. 2. Determine the range of the measured value of T1 to determine the maximum operable compressor frequency. If the measured values ​​of T1_21 to T1_25 are less than the set value T1_j, the compressor can operate at the frequency value F21~F25 of the corresponding range shown in the figure below. Otherwise, it can only operate at the maximum frequency of the range where T4=0℃. The set value T1_j is recommended to be between 18~26℃, preferably 20~22℃. When at least one of the above conditions is met, the corresponding operating frequency is executed.

[0111] In this embodiment, while the heat recovery air conditioning unit meets the overall electrical control heating protection conditions, the operating frequency of the compressor is adjusted by considering both the outlet water temperature of the water tank and the ambient temperature of the indoor unit. This results in more accurate control of electrical heating reliability and more efficient and reliable unit operation.

[0112] 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.

[0113] 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.

[0114] In addition, for technical details not described in detail in this embodiment, please refer to the heat recovery air conditioning unit control method provided in any embodiment of the present invention, which will not be repeated here.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 heat recovery air conditioning unit, characterized in that, The heat recovery air conditioning unit control method is applied to the heat recovery air conditioning unit, which includes multiple indoor units, a water tank and an outdoor unit. The water tank is connected to the outdoor unit, and each indoor unit is connected to the outdoor unit. The control method for the heat recovery air conditioning unit includes: When the heat recovery air conditioning unit meets the conditions for whole-unit electronic control heating protection, the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank and the ambient temperature of the indoor unit are detected. The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the outdoor ambient temperature sensor temperature, the outlet water temperature and the ambient temperature. Before detecting the outdoor ambient temperature sensor temperature of the outdoor unit, the outlet water temperature of the water tank, and the ambient temperature of the indoor unit when the heat recovery air conditioning unit meets the whole-unit electronic control heating protection conditions, the method further includes: When the water tank is turned on and there is energy demand, at least one indoor unit is turned on and there is energy demand, and the heat recovery air conditioning unit is operating in a mixed heating mode, the heat recovery air conditioning unit is determined to meet the whole unit electronic control heating protection conditions. Adjusting the operating frequency of the compressor of the heat recovery air conditioning unit based on at least one of the outdoor ambient temperature sensor temperature, the outlet water temperature, and the ambient temperature includes: When the outdoor ambient temperature sensor temperature is lower than a preset temperature threshold, the ambient temperature range of the temperature sensor and the water outlet temperature range of the water tank are determined. The operating frequency limit is determined based on the temperature range of the temperature sensor and the water outlet temperature range of the water tank. The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

2. The control method for a heat recovery air conditioning unit as described in claim 1, characterized in that, After detecting the outdoor ambient temperature sensor temperature and the ambient temperature when the heat recovery air conditioning unit meets the overall electronic control heating protection conditions, the process further includes: When the temperature of the outdoor ambient temperature sensor is lower than a preset temperature threshold, the temperature range of the temperature sensor in which the ambient temperature falls is determined. The operating frequency limit is determined based on the temperature range of the temperature sensor. The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

3. The control method for a heat recovery air conditioning unit as described in claim 1, characterized in that, After detecting the outdoor ambient temperature sensor temperature and the outlet water temperature when the heat recovery air conditioning unit meets the overall electronic control heating protection conditions, the process further includes: When the temperature of the outdoor ambient temperature sensor is lower than a preset temperature threshold, the water outlet temperature range of the water tank is determined. The operating frequency limit is determined based on the water outlet temperature range of the water tank. The operating frequency of the compressor of the heat recovery air conditioning unit is adjusted according to the operating frequency limit.

4. The control method for a heat recovery air conditioning unit as described in any one of claims 1 to 3, characterized in that, After adjusting the operating frequency of the compressor of the heat recovery air conditioning unit, the method further includes: When the heat recovery air conditioning unit meets the overheat protection stop condition, the adjustment of the compressor operating frequency of the heat recovery air conditioning unit is stopped, and the electronic overheat protection control is exited.

5. The heat recovery air conditioning unit control method as described in claim 4, characterized in that, Before stopping the adjustment of the compressor operating frequency of the heat recovery air conditioning unit and exiting the electronically controlled heating protection control when the heat recovery air conditioning unit meets the heating protection stop condition, the method further includes: Upon receiving a remote shutdown command, the heat recovery air conditioning unit is determined to meet the conditions for stopping the overheating protection. When the water tank is found to be without power, the heat recovery air conditioning unit is determined to meet the heating protection shutdown condition; When it is detected that there is no energy demand in each indoor unit, it is determined that the heat recovery air conditioning unit meets the heating protection shutdown condition; When the heat recovery air conditioning unit is detected to have entered defrosting mode or oil return mode, it is determined that the heat recovery air conditioning unit meets the conditions for stopping the overheating protection.

6. A control device for a heat recovery air conditioning unit, characterized in that, The heat recovery air conditioning unit control device executes the heat recovery air conditioning unit control method according to any one of claims 1 to 5, and the heat recovery air conditioning unit control device includes: The data detection module is used to detect the corresponding temperature values ​​when the heat recovery air conditioning unit meets the whole unit's electronic control heating protection conditions; The operation adjustment module is used to adjust the operating frequency of the compressor of the heat recovery air conditioning unit.

7. A heat recovery air conditioning unit, characterized in that, The heat recovery air conditioning unit includes: a memory, a processor, and a heat recovery air conditioning unit control program stored in the memory and running on the processor, the heat recovery air conditioning unit control program being configured to implement the heat recovery air conditioning unit control method as described in any one of claims 1 to 5.

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

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