Control method of heat recovery system, controller, heat recovery system and medium

Abstract

The embodiment of the invention provides a control method of a heat recovery system, a controller, the heat recovery system and a medium, and the control method comprises the following steps: under the condition that an indoor unit has a refrigeration demand, if a water tank has an active heat recovery function, obtaining an indoor unit state of the indoor unit and a water tank state of the water tank; and then a target operation mode is determined according to the state of the indoor unit and the state of the water tank, the heat recovery system is controlled to execute the target operation mode, and the target operation mode comprises one of the following modes: a partial heat recovery mode, a total heat recovery mode and a refrigeration mode. When the air conditioner has the refrigeration requirement, the hot water temperature can be automatically recognized, whether the air conditioner can operate according to heat recovery or not is judged, indoor heat is stored in the water tank, energy storage and energy saving of the water tank are achieved, meanwhile, excessive heat is prevented from being discharged into the atmosphere, and therefore the heat island effect is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a control method, a controller, a heat recovery system and a medium for a heat recovery system. Background Art

[0002] In the related technology, the existing heat recovery system is an air conditioner that can meet multiple cooling and heating needs at the same time. The basic principle of refrigeration of conventional air conditioners is the process of heat transfer. When cooling, the heat on the indoor side is transferred to the outdoor air, and when heating, the heat of the outdoor air is transferred to the indoor side. When the air conditioner is cooling, the heat recovery air conditioner transfers the heat to the water in the water tank instead of discharging the heat into the air. The large-scale application of heat recovery air conditioners can effectively reduce the urban heat island effect, while increasing the temperature of the water, which can be used for other purposes after the water temperature is raised.

[0003] However, the existing heat recovery system will only perform heat recovery when the water tank and refrigeration energy demand exist at the same time, which limits the scope of application of heat recovery and reduces the advantages of heat recovery. Moreover, when energy demand mismatch occurs, the advantages of heat recovery are wasted, and there is not much difference from ordinary air conditioners. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, a controller, a heat recovery system and a medium for a heat recovery system, aiming to expand the application scope of heat recovery and enhance the advantages of heat recovery.

[0005] In a first aspect, an embodiment of the present application provides a control method for a heat recovery system, wherein the heat recovery system includes an outdoor unit, an indoor unit, and a water tank, wherein the outdoor unit, the indoor unit, and the water tank are connected via a refrigerant pipeline; the method includes:

[0006] In the case where the indoor unit has a cooling demand, when it is determined that the water tank has an active heat recovery function, obtaining the indoor unit state of the indoor unit and the water tank state of the water tank;

[0007] A target operating mode is determined according to the state of the indoor unit and the state of the water tank, and the heat recovery system is controlled to execute the target operating mode, wherein the target operating mode includes one of the following: partial heat recovery mode, full heat recovery mode, and cooling mode.

[0008] According to some embodiments of the present application, determining the target operation mode according to the state of the indoor unit and the state of the water tank includes:

[0009] When the state of the indoor unit and the state of the water tank meet the first entry condition, the target operation mode is determined to be the partial heat recovery mode; wherein the first entry condition includes at least one of the following:

[0010] The cooling energy requirement of the indoor unit is greater than the preset energy requirement, and the water tank temperature of the water tank is less than the preset maximum operable water temperature;

[0011] The operation mode of at least one of the indoor units is the dehumidification mode, the water tank temperature of the water tank is lower than the preset maximum operable water temperature, and the water temperature at the lower part of the water tank is higher than the first preset temperature.

[0012] According to some embodiments of the present application, the method further includes:

[0013] In the case where the heat recovery system executes the partial heat recovery mode, when a first exit condition is met, the heat recovery system is controlled to exit the partial heat recovery mode; wherein the first exit condition includes at least one of the following:

[0014] The water tank temperature is greater than or equal to the water tank set temperature;

[0015] The water tank temperature is greater than or equal to the maximum operable water temperature;

[0016] The cooling energy of the indoor unit needs to be zero;

[0017] The water supply valve of the water tank is in an on state, and the temperature of the water tank remains lower than the second preset temperature for a first preset time period.

[0018] According to some embodiments of the present application, determining the target operation mode according to the state of the indoor unit and the state of the water tank further includes:

[0019] When the state of the indoor unit and the state of the water tank meet the second entry condition, the target operation mode is determined to be the full heat recovery mode; wherein the second entry condition includes at least one of the following:

[0020] The cooling energy requirement of the indoor unit is less than or equal to the preset energy requirement, and the water tank temperature of the water tank is less than the preset maximum operable water temperature;

[0021] The water replenishment valve of the water tank is in an on state, and the water tank temperature is lower than a second preset temperature, and the water tank temperature of the water tank is lower than a preset maximum operable water temperature.

[0022] According to some embodiments of the present application, the method further includes:

[0023] In the case where the heat recovery system executes the full heat recovery mode, when a second exit condition is met, the heat recovery system is controlled to exit the full heat recovery mode; wherein the second exit condition includes at least one of the following:

[0024] The water tank temperature is greater than or equal to the water tank set temperature;

[0025] The water tank temperature is greater than or equal to the maximum operable water temperature;

[0026] The cooling energy of the indoor unit needs to be zero;

[0027] During the second preset time period, the operation mode of at least one of the indoor units is the dehumidification mode, and the water temperature at the lower part of the water tank is maintained greater than the first preset temperature.

[0028] According to some embodiments of the present application, after determining the target operation mode according to the state of the indoor unit and the state of the water tank, the method further includes:

[0029] Get the water tank set temperature;

[0030] The water tank set temperature is adjusted to adjust the water tank set temperature to a maximum set temperature.

[0031] According to some embodiments of the present application, determining the target operation mode according to the state of the indoor unit and the state of the water tank further includes:

[0032] When the indoor machine state and the water tank state meet the third entry condition, the target operation mode is determined to be the cooling mode; wherein the third entry condition includes at least one of the following:

[0033] The water tank temperature of the water tank is greater than or equal to the preset maximum operable water temperature;

[0034] The outdoor unit has energy demand, and the heat recovery system is not currently executing the partial heat recovery mode or the full heat recovery mode.

[0035] According to some embodiments of the present application, the method further includes:

[0036] In the case where the heat recovery system executes the cooling mode, when a third exit condition is met, the heat recovery system is controlled to exit the cooling mode; wherein the third exit condition includes at least one of the following:

[0037] The cooling energy of the indoor unit needs to be zero;

[0038] The heat recovery system satisfies the first entry condition or the second entry condition.

[0039] According to some embodiments of the present application, the water tank temperature is determined by the following steps:

[0040] Obtaining the water temperature at the upper part of the water tank and the water temperature at the lower part of the water tank;

[0041] The average water temperature of the upper part of the water tank and the lower part of the water tank is calculated, and the average water temperature is used as the water tank temperature.

[0042] According to some embodiments of the present application, the preset energy may be determined by the following steps:

[0043] Determining a water temperature interval in which the water tank temperature lies according to the water tank temperature;

[0044] The preset energy requirement is determined according to the water temperature range, wherein there is a negative correlation between the size of the preset energy requirement and the height of the water temperature range.

[0045] According to some embodiments of the present application, including:

[0046] In the partial heat recovery mode, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing coils, and the indoor unit coil of the indoor unit is used as an evaporating coil;

[0047] In the full heat recovery mode, the water tank coil of the water tank is used as a condensing coil, and the indoor coil of the indoor unit and the outdoor coil of the outdoor unit are both used as evaporating coils;

[0048] In the cooling mode, the outdoor unit coil of the outdoor unit serves as a condensing coil, the indoor unit coil of the indoor unit serves as an evaporating coil, and the refrigerant stops flowing through the water tank coil of the water tank.

[0049] In a second aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the heat recovery system of the first aspect mentioned above when running the computer program.

[0050] In a third aspect, an embodiment of the present application provides a heat recovery system, comprising the controller of the second aspect described above.

[0051] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the heat recovery system as described in the first aspect above.

[0052] In a fifth aspect, an embodiment of the present application provides a computer program product, comprising a computer program or computer instructions, characterized in that the computer program or the computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium, and the processor executes the computer program or the computer instructions, so that the computer device executes the control method of the heat recovery system as described in the first aspect above.

[0053] According to the technical solution of the embodiment of the present application, at least the following beneficial effects are achieved: when the indoor unit has a cooling demand, if the water tank has an active heat recovery function, the embodiment of the present application will obtain the indoor unit state of the indoor unit and the water tank state of the water tank, and then determine the target operation mode according to the indoor unit state and the water tank state, and control the heat recovery system to execute the target operation mode, wherein the target operation mode includes one of the following: partial heat recovery mode, full heat recovery mode, and cooling mode. When the air conditioner has a cooling demand, the embodiment of the present application will automatically identify the hot water temperature and determine whether it can be operated according to heat recovery, so that the indoor heat is stored in the water tank, realizing the energy storage of the water tank, saving energy while preventing excessive heat from being discharged into the atmosphere, thereby reducing the heat island effect.

[0054] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0056] Figure 1 It is a schematic diagram of the refrigerant flow direction of a heat recovery system in a cooling mode provided by an embodiment of the present application;

[0057] Figure 2 It is a schematic diagram of the refrigerant flow direction of a heat recovery system in a partial heat recovery mode provided by an embodiment of the present application;

[0058] Figure 3 It is a schematic diagram of the refrigerant flow direction of a heat recovery system in full heat recovery mode provided by an embodiment of the present application;

[0059] Figure 4 is a flow chart of a control method for a heat recovery system provided by an embodiment of the present application;

[0060] Figure 5 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0061] Figure 6 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0062] Figure 7 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0063] Figure 8is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0064] Fig. 9 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0065] Fig.10 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0066] Fig.11 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0067] Fig.12 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0068] Fig.13 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0069] Fig.14 is an overall flow chart of a control method for a heat recovery system provided by an embodiment of the present application;

[0070] Fig.15 It is a schematic diagram of a controller for executing a control method for a heat recovery system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0071] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0072] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0074] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0075] In some cases, the existing heat recovery system is an air conditioner that can meet multiple cooling and heating needs at the same time. The basic principle of refrigeration of conventional air conditioners is the process of heat transfer. When cooling, the heat of the indoor side is transferred to the outdoor air, and when heating, the heat of the outdoor air is transferred to the indoor side. When the air conditioner is cooling, the heat recovery air conditioner transfers the heat to the water in the water tank instead of discharging the heat into the air. The large-scale application of heat recovery air conditioners can effectively reduce the urban heat island effect, while increasing the temperature of the water, which can be used for other purposes after the water temperature is raised.

[0076] However, the existing heat recovery system will only perform heat recovery when the water tank and refrigeration energy demand exist at the same time, which limits the scope of application of heat recovery and reduces the advantages of heat recovery. Moreover, when energy demand mismatch occurs, the advantages of heat recovery are wasted, and there is not much difference from ordinary air conditioners.

[0077] Based on the above situation, the embodiments of the present application propose a control method, a controller, a heat recovery system and a medium for a heat recovery system, aiming to expand the scope of application of heat recovery and enhance the advantages of heat recovery.

[0078] The various embodiments of the heat recovery system of the present application are further described below in conjunction with the accompanying drawings.

[0079] like Figures 1 to 3 As shown, Figures 1 to 3 They are schematic diagrams of refrigerant flow in a heat recovery system provided in an embodiment of the present application in a cooling mode, a partial heat recovery mode, and a full heat recovery mode.

[0080] In one embodiment, the heat recovery system includes an indoor device and an outdoor device, wherein the indoor device includes an indoor unit 100 and a water tank 300, and the outdoor device includes an outdoor unit, and the outdoor unit, the indoor unit 100 and the water tank 300 are connected through a refrigerant pipeline; wherein the outdoor unit is provided with an outdoor heat exchanger 200, a compressor 400 and a valve assembly, and the compressor 400 is connected to the outdoor heat exchanger 200, the indoor unit 100 and the water tank 300 through the valve assembly.

[0081] In one embodiment, the valve assembly includes a plurality of four-way valves 500. In addition, the outdoor unit is also provided with a throttling assembly; specifically, the compressor 400 can be throttled by a four-way valve 500 (such as Figure 1The four-way valve 500 in the middle position shown in FIG. 1 is connected to the water tank 300, and the water tank 300 is connected to one end of the indoor unit 100 through a throttling assembly, and the other end of the indoor unit 100 is connected to another four-way valve 500 (as shown in FIG. Figure 1 In addition, the compressor 400 is connected to the left side of the compressor 400 through another four-way valve 500 (as shown in FIG. Figure 1 The four-way valve 500 at the right position shown in FIG. 1 is connected to the outdoor heat exchanger 200, and the outdoor heat exchanger 200 is connected to one end of the indoor unit 100 through a throttling assembly, and the other end of the indoor unit 100 is connected to the four-way valve 500 (as shown in FIG. Figure 1 The four-way valve 500 is connected in the left position as shown.

[0082] In one embodiment, if Figure 1 As shown, the throttling assembly includes a main electronic expansion valve 600 and multiple sub-electronic expansion valves 700. The water tank 300 is connected to the outdoor heat exchanger 200 through the main electronic expansion valve 600, and the water tank 300 is also connected to each indoor unit 100 through the sub-electronic expansion valve 700.

[0083] In one embodiment, the heat recovery system may include a plurality of indoor units 100, and the refrigerant input port of each indoor unit 100 is provided with a sub-electronic expansion valve 700, which can control the refrigerant flow input to the corresponding indoor unit 100; the refrigerant output port of the water tank 300 can also be connected to each sub-electronic expansion valve 700 and the main electronic expansion valve 600 through the first electronic expansion valve 800, and by controlling the first electronic expansion valve 800, the refrigerant flow input to each sub-electronic expansion valve 700 can be controlled.

[0084] like Figure 1 As shown, when the cooling mode is executed and heat recovery is not required, the refrigerant is compressed by the compressor 400 and then enters the outdoor heat exchanger 200 through the four-way valve 500 at the right position for heat exchange and condensation. At this time, the main electronic expansion valve 600 and the sub-electronic expansion valve 700 are in the open state. Therefore, the condensed refrigerant passes through the main electronic expansion valve 600 and the sub-electronic expansion valve 700 and enters each indoor unit 100 for evaporation treatment. Finally, the refrigerant after evaporation treatment re-enters the compressor 400 through the four-way valve 500 at the left position, forming a cycle.

[0085] like Figure 2As shown, in the case of executing the partial heat recovery mode, after the refrigerant is compressed by the compressor 400, it is divided into two parts of refrigerant. One part of the refrigerant will enter the outdoor heat exchanger 200 through the four-way valve 500 at the right position for heat exchange and condensation, and at this time the main electronic expansion valve 600 and the sub-electronic expansion valve 700 are in an open state, so the condensed refrigerant passes through the main electronic expansion valve 600 and the sub-electronic expansion valve 700 to enter each indoor unit 100 for evaporation treatment; while the other part of the refrigerant enters the water tank 300 through the four-way valve 500 at the middle position for heat exchange and condensation, and then the water in the water tank 300 can be heated and stored, and at this time the first electronic expansion valve 800 and the sub-electronic expansion valve 700 are in an open state, so the condensed refrigerant passes through the first electronic expansion valve 800 and the sub-electronic expansion valve 700 to enter each indoor unit 100 for evaporation treatment; finally, for all the refrigerants that have been evaporated by the indoor unit 100, they will re-enter the compressor 400 through the four-way valve 500 at the left position to form a cycle.

[0086] like Figure 3 As shown, in the case of executing the full heat recovery mode, after the refrigerant is compressed by the compressor 400, it enters the water tank 300 through the four-way valve 500 in the middle position for heat exchange and condensation, and then the water in the water tank 300 can be heated, and at this time, the first electronic expansion valve 800, the main electronic expansion valve 600 and the sub-electronic expansion valve 700 are in the open state, so the condensed refrigerant will be divided into two parts, one part of the refrigerant enters each indoor unit 100 through the sub-electronic expansion valve 700 for evaporation, and finally, the refrigerant after evaporation will re-enter the compressor 400 through the four-way valve 500 in the left position, forming a cycle. At the same time, the other part of the refrigerant enters the outdoor heat exchanger 200 through the main electronic expansion valve 600 for evaporation, and finally, the refrigerant after evaporation will re-enter the compressor 400 through the four-way valve 500 in the right position, forming a cycle.

[0087] Based on the hardware structure of the heat recovery system of each of the above-mentioned embodiments, various embodiments of the control method of the heat recovery system of the present application are respectively proposed below.

[0088] like Figure 4 As shown, Figure 4 It is a flow chart of a control method of a heat recovery system provided by an embodiment of the present application; the control method of the heat recovery system may include but is not limited to step S410 and step S420.

[0089] Step S410: when the indoor unit has a cooling demand and it is determined that the water tank has an active heat recovery function, the indoor unit state of the indoor unit and the water tank state of the water tank are obtained;

[0090] Step S420, determine the target operation mode according to the state of the indoor unit and the state of the water tank, and control the heat recovery system to execute the target operation mode, wherein the target operation mode includes one of the following: partial heat recovery mode, full heat recovery mode, and cooling mode.

[0091] In one embodiment, when the indoor unit has a cooling demand, if the water tank has an active heat recovery function, the embodiment of the present application will obtain the indoor unit state of the indoor unit and the water tank state of the water tank, and then determine the target operation mode according to the indoor unit state and the water tank state, and control the heat recovery system to execute a partial heat recovery mode, a full heat recovery mode or a cooling mode. When the air conditioner has a cooling demand, the embodiment of the present application will automatically identify the hot water temperature and determine whether it can be operated according to heat recovery, so that the indoor heat is stored in the water tank, the water tank is stored, energy is saved, and excessive heat is prevented from being discharged into the atmosphere, thereby reducing the heat island effect.

[0092] It is understandable that if a cooling start command sent by the user is received, and the temperature set by the user is lower than the current indoor ambient temperature, it can be considered that the indoor unit has a cooling demand.

[0093] It should be noted that the outdoor unit will identify whether the water tank has an active heat recovery flag. If the water tank has an active heat recovery flag, it is determined that the water tank has an active heat recovery function; if the water tank does not have an active heat recovery flag, it is determined that the water tank does not have an active heat recovery function.

[0094] In one embodiment, in the partial heat recovery mode, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing coils, and the indoor unit coil of the indoor unit is used as an evaporating coil.

[0095] In one embodiment, in the full heat recovery mode, the water tank coil of the water tank serves as a condensing coil, and the indoor unit coil of the indoor unit and the outdoor unit coil of the outdoor unit both serve as evaporating coils.

[0096] In one embodiment, in cooling mode, the outdoor unit coil of the outdoor unit serves as a condensing coil, the indoor unit coil of the indoor unit serves as an evaporating coil, and the refrigerant stops flowing through the water tank coil of the water tank.

[0097] It should be noted that the determination of the target operation mode according to the state of the indoor unit and the state of the water tank in the above step S420 may include but is not limited to: Figures 5 to 7 There are three implementation scenarios, as follows:

[0098] like Figure 5 As shown, Figure 5 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; regarding the entry logic of the partial heat recovery mode, it may include but is not limited to step S510 and step S520.

[0099] Step S510: When the indoor unit state and the water tank state meet the first entry condition;

[0100] Step S520, determine that the target operating mode is a partial heat recovery mode; wherein the first entry condition includes at least one of the following: the cooling energy demand of the indoor unit is greater than the preset energy demand, and the water tank temperature of the water tank is less than the preset maximum operating water temperature; or, there is at least one indoor unit whose operating mode is a dehumidification mode, and the water tank temperature of the water tank is less than the preset maximum operating water temperature, and the water temperature at the bottom of the water tank is greater than the first preset temperature.

[0101] In one embodiment, if the cooling energy demand of the indoor unit is greater than the preset energy demand, and the water tank temperature of the water tank is lower than the preset maximum operable water temperature, it indicates that the indoor environment still needs a large amount of cooling, the evaporation effect of the indoor unit will be very strong, and the refrigerant will take away a large amount of heat from the room, but the refrigerant cannot be cooled to the target temperature by the water tank alone. For this, the outdoor unit is required to perform auxiliary cooling. For this, the heat recovery system will enter a partial heat recovery mode, that is, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing coils, and the indoor unit coil of the indoor unit is used as an evaporating coil.

[0102] In one embodiment, if there is at least one indoor unit whose operating mode is dehumidification mode, and the water tank temperature of the water tank is lower than the preset maximum operating water temperature, and the water temperature at the bottom of the water tank is higher than the first preset temperature, the evaporation effect of the indoor unit will be very strong in the dehumidification mode, and the refrigerant will take away a large amount of heat from the room. At the same time, due to the high water temperature at the bottom of the water tank, the refrigerant cannot be cooled to the target temperature by the water tank alone. For this, the outdoor unit is required to perform auxiliary cooling. For this, the heat recovery system will enter a partial heat recovery mode, that is, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing coils, and the indoor unit coil of the indoor unit is used as an evaporating coil.

[0103] It can be understood that the above-mentioned preset energy requirement and the first preset temperature can be pre-set, and the embodiment of the present application does not specifically limit the specific values ​​of the preset energy requirement and the first preset temperature.

[0104] In addition, it can be understood that the above-mentioned maximum operable water temperature can be obtained from the factory parameters of the water tank, and the maximum operable water temperature can be determined according to the type of water tank, and the embodiments of the present application do not make specific limitations on it.

[0105] like Figure 6 As shown, Figure 6 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; regarding the entry logic of the full heat recovery mode, it may include but is not limited to step S610 and step S620.

[0106] Step S610: When the indoor unit state and the water tank state meet the second entry condition;

[0107] Step S620, determine that the target operating mode is the full heat recovery mode; wherein the second entry condition includes at least one of the following: the cooling energy requirement of the indoor unit is less than or equal to the preset energy requirement, and the water tank temperature of the water tank is less than the preset maximum operating water temperature; or, the water tank fill valve is in the on state, and the water tank temperature is less than the second preset temperature, and the water tank temperature of the water tank is less than the preset maximum operating water temperature.

[0108] In one embodiment, if the cooling energy demand of the indoor unit is less than or equal to the preset energy demand, and the water tank temperature of the water tank is less than the preset maximum operating water temperature, it indicates that the indoor unit still needs cooling, but the indoor environment no longer requires a large amount of cooling, the evaporation effect of the indoor unit will be weakened, and the refrigerant will not take away much heat from the room. Therefore, the refrigerant can be cooled to the target temperature by the water tank alone, and the outdoor unit is not required to perform auxiliary cooling. In this case, the heat recovery system will enter the full heat recovery mode, that is, the water tank coil of the water tank is used as the condensing coil, and the indoor unit coil of the indoor unit and the outdoor unit coil of the outdoor unit are both used as evaporating coils.

[0109] In one embodiment, if the water supply valve of the water tank is in the on state, and the water tank temperature is lower than the second preset temperature, and the water tank temperature of the water tank is lower than the preset maximum operating water temperature, it indicates that the cooling capacity of the water tank is large or the demand for hot water is large, and the refrigerant needs to flow through the outdoor heat exchanger for evaporation. In this regard, the heat recovery system will enter the full heat recovery mode, that is, the water tank coil of the water tank is used as the condensing coil, and the indoor unit coil of the indoor unit and the outdoor unit coil of the outdoor unit are both used as evaporating coils.

[0110] It can be understood that the above-mentioned second preset temperature can be pre-set, and the embodiment of the present application does not specifically limit the specific value of the second preset temperature.

[0111] like Figure 7 As shown, Figure 7 It is a flow chart of a control method of a heat recovery system provided by another embodiment of the present application; regarding the entry logic of the cooling mode, it may include but is not limited to step S710 and step S720.

[0112] Step S710: When the indoor unit state and the water tank state meet the third entry condition;

[0113] Step S720, determine that the target operating mode is the cooling mode; wherein the third entry condition includes at least one of the following: the water tank temperature of the water tank is greater than or equal to the preset maximum operating water temperature; or, there is energy demand for the outdoor unit, and the heat recovery system is not currently executing the partial heat recovery mode or the full heat recovery mode.

[0114] In one embodiment, if the water tank temperature of the water tank is greater than or equal to the preset maximum operating water temperature, it indicates that the water tank can no longer be heated. In this regard, the heat recovery system will enter the cooling mode, that is, the outdoor unit coil of the outdoor unit serves as a condensing coil, the indoor unit coil of the indoor unit serves as an evaporating coil, and the refrigerant stops flowing through the water tank coil of the water tank.

[0115] In one embodiment, if there is energy demand in the outdoor unit and the heat recovery system is not currently executing the partial heat recovery mode or the full heat recovery mode, the heat recovery system will enter the cooling mode, that is, the outdoor unit coil of the outdoor unit serves as the condensing coil, the indoor unit coil of the indoor unit serves as the evaporating coil, and the refrigerant stops flowing through the water tank coil of the water tank.

[0116] Based on Figure 5 The entry logic of the partial heat recovery mode is shown in FIG. 1 . After entering the partial heat recovery mode, its exit logic can be seen in FIG. Figure 8 As shown, including but not limited to step S810 and step S820.

[0117] Step S810: When the heat recovery system executes the partial heat recovery mode, determining that a first exit condition is satisfied;

[0118] Step S820, control the heat recovery system to exit the partial heat recovery mode; wherein, the first exit condition includes at least one of the following: the water tank temperature is greater than or equal to the water tank set temperature; the water tank temperature is greater than or equal to the maximum operating water temperature; the cooling energy of the indoor unit needs to be zero; the water tank water supply valve is in the on state, and the water tank temperature remains lower than the second preset temperature for a first preset time period.

[0119] In one embodiment, when executing the partial heat recovery mode, if the water tank temperature reaches the water tank set temperature, it indicates that the water tank has no demand for hot water, and the water tank coil is no longer used for condensation processing. At this time, the heat recovery system will exit the partial heat recovery mode.

[0120] In one embodiment, when executing the partial heat recovery mode, if the water tank temperature is greater than or equal to the maximum operable water temperature, it indicates that the water tank can no longer store energy and the water tank coil can no longer be used for condensation processing. At this time, the heat recovery system will exit the partial heat recovery mode.

[0121] In one embodiment, when executing the partial heat recovery mode, if the cooling energy of the indoor unit is required to be zero, it indicates that the indoor environment is already low enough, and the indoor unit will not perform evaporation processing at this time. Therefore, the water tank coil will not perform condensation processing at this time. In this regard, the heat recovery system will exit the partial heat recovery mode.

[0122] In one embodiment, when executing the partial heat recovery mode, if the water supply valve of the water tank is in the on state and the water tank temperature remains lower than the second preset temperature for a first preset time, it indicates that the cooling capacity of the water tank is large or the demand for hot water is large, and the refrigerant needs to flow through the outdoor heat exchanger for evaporation. In this regard, the heat recovery system will exit the partial heat recovery mode and enter the full heat recovery mode.

[0123] It can be understood that the above-mentioned water tank set temperature can be preset by the user, and the embodiment of the present application does not specifically limit the specific value of the water tank set temperature.

[0124] In addition, it can be understood that the above-mentioned first preset time length can be preset by the user, and the embodiment of the present application does not specifically limit the specific value of the first preset time length.

[0125] Based on Figure 6 The entry logic of the full heat recovery mode is shown in the figure. After entering the full heat recovery mode, its exit logic can be seen in the figure. Fig. 9 As shown, including but not limited to step S910 and step S920.

[0126] Step S910: When the heat recovery system executes the full heat recovery mode, determining that a second exit condition is satisfied;

[0127] Step S920, control the heat recovery system to exit the full heat recovery mode; wherein, the second exit condition includes at least one of the following: the water tank temperature is greater than or equal to the water tank set temperature; the water tank temperature is greater than or equal to the maximum operating water temperature; the cooling energy of the indoor unit needs to be zero; within the second preset time period, there is at least one indoor unit whose operating mode is the dehumidification mode, and the water temperature at the bottom of the water tank remains greater than the first preset temperature.

[0128] In one embodiment, when executing the full heat recovery mode, if the water tank temperature is greater than or equal to the water tank set temperature, if the water tank temperature reaches the water tank set temperature, it indicates that the water tank has no demand for hot water, and the water tank coil is no longer used for condensation processing. At this time, the heat recovery system will exit the full heat recovery mode.

[0129] In one embodiment, when executing the full heat recovery mode, if the water tank temperature is greater than or equal to the maximum operable water temperature, it indicates that the water tank can no longer store energy and the water tank coil can no longer be used for condensation processing. At this time, the heat recovery system will exit the full heat recovery mode.

[0130] In one embodiment, when executing the full heat recovery mode, if the cooling energy of the indoor unit needs to be zero, it means that the indoor environment is already low enough, and the indoor unit will not perform evaporation processing at this time. Therefore, the water tank coil will not perform condensation processing at this time. In this regard, the heat recovery system will exit the full heat recovery mode.

[0131] In one embodiment, when executing the full heat recovery mode, if within the second preset time period, the operating mode of at least one indoor unit is the dehumidification mode, and the water temperature at the bottom of the water tank is maintained greater than the first preset temperature, the evaporation effect of the indoor unit will be very strong in the dehumidification mode, and the refrigerant will take away a large amount of heat from the room. At the same time, due to the high water temperature at the bottom of the water tank, the refrigerant cannot be cooled to the target temperature by the water tank alone. For this, the outdoor unit is required to perform auxiliary cooling. For this, the heat recovery system will exit the full heat recovery mode and enter the partial heat recovery mode.

[0132] In addition, it can be understood that the above-mentioned second preset time length can be preset by the user, and the embodiment of the present application does not specifically limit the specific value of the second preset time length.

[0133] Based on Figure 7 The entry logic of the cooling mode is shown in the figure. After entering the cooling mode, its exit logic can be seen in the figure. Fig.10 As shown, including but not limited to step S1010 and step S1020.

[0134] Step S1010: When the heat recovery system executes the cooling mode, determining that a third exit condition is satisfied;

[0135] Step S1020, controlling the heat recovery system to exit the cooling mode; wherein the third exit condition includes at least one of the following: the cooling energy of the indoor unit needs to be zero; the heat recovery system meets the first entry condition or the second entry condition.

[0136] In one embodiment, when the cooling mode is executed, if the cooling energy required by the indoor unit is zero, it indicates that the indoor environment is already low enough, and the heat recovery system will exit the cooling mode.

[0137] In one embodiment, when the cooling mode is executed, if the heat recovery system meets the first entry condition or the second entry condition, the heat recovery system will exit the cooling mode and switch to the partial heat recovery mode or the full heat recovery mode.

[0138] In addition, if Fig.11 As shown, Fig.11 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; after entering the partial heat recovery mode or the full heat recovery mode, the control method will also adjust the set temperature of the water tank, specifically including but not limited to step S1110 and step S1120.

[0139] Step S1110, obtaining the set temperature of the water tank;

[0140] Step S1120: adjust the water tank set temperature to adjust the water tank set temperature to the maximum set temperature.

[0141] In one embodiment, after entering the partial heat recovery mode or the full heat recovery mode, the embodiment of the present application will adjust the set temperature of the water tank to increase the set temperature of the water tank and adjust the set temperature of the water tank to the maximum set temperature, so that the hot water storage capacity of the water tank can be higher.

[0142] In addition, if Fig.12 As shown, Fig.12 It is a flow chart of a control method for a heat recovery system provided in another embodiment of the present application; regarding the process of obtaining the water tank temperature, it may include but is not limited to step S1210 and step S1220.

[0143] Step S1210, obtaining the water temperature at the upper part of the water tank and the water temperature at the lower part of the water tank;

[0144] Step S1220, calculate the average water temperature of the upper part of the water tank and the lower part of the water tank, and use the average water temperature as the water tank temperature.

[0145] In one embodiment, the water tank temperature may be an average of the water temperature at the upper part of the water tank and the water temperature at the lower part of the water tank.

[0146] In addition, if Fig.13 As shown, Fig.13 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; regarding the process of obtaining the preset energy demand, it may include but is not limited to step S1310 and step S1320.

[0147] Step S1310, determining the water temperature range of the water tank temperature according to the water tank temperature;

[0148] Step S1320: determining a preset energy demand according to the water temperature range, wherein the preset energy demand is negatively correlated with the water temperature range.

[0149] In one embodiment, the preset energy requirement is a value related to the water temperature. When the water temperature is higher, the preset energy requirement is lower, and when the water temperature is lower, the preset energy requirement is higher.

[0150] Based on the control methods of the heat recovery system of the above-mentioned various embodiments, overall embodiments of the control methods of the heat recovery system of the present application are respectively proposed below.

[0151] like Fig.14 As shown, Fig.14 This is an overall flow chart of a control method for a heat recovery system provided by an embodiment of the present application. When the air conditioner is cooling, it automatically identifies the hot water temperature and determines whether it can be operated according to heat recovery, and stores the indoor heat in the water tank to achieve energy storage in the water tank. The specific control scheme is as follows.

[0152] This function can be used to judge and control the following in the outdoor unit:

[0153] 1. Set the engineering mode of the water tank wire controller. This function is turned on or off. The factory default is that active heat recovery is turned on. After the outdoor unit recognizes the flag, it runs the relevant program.

[0154] 2. Control content:

[0155] The outdoor unit identifies whether the water tank has an active heat recovery flag, thereby determining whether the water tank has an active heat recovery function.

[0156] When the system detects that there is a cooling energy demand, the outdoor unit determines whether the following entry conditions are met:

[0157] 2.1. Active partial heat recovery judges the following conditions: (When the water temperature is too high, the water tank cannot cool the refrigerant to the target temperature and requires auxiliary cooling from an external unit).

[0158] Entry conditions:

[0159] 1. The water tank temperature Ttank is lower than the maximum operating water temperature Tlimt, and the cooling energy needs to be greater than Qc.

[0160] 2. When the water tank temperature Ttank is lower than the maximum operating water temperature Tlimt, the water temperature at the bottom of the water tank is higher than Ta, and the operating mode of any indoor unit is dehumidification mode.

[0161] Execute action:

[0162] The water tank set temperature is adjusted to the maximum set temperature (after the exit conditions are met, it is adjusted to the original set temperature), and the air conditioner is controlled according to partial heat recovery.

[0163] Exit Conditions

[0164] 1. The water tank reaches the temperature, or the water temperature reaches Tlimt;

[0165] 2. No refrigeration requirement;

[0166] 3. When the water supply valve is in the on state and the water temperature is lower than Tb temperature, it will enter the full heat recovery mode for t1 time.

[0167] 2.2. Active full heat recovery determines the following conditions: (the cooling capacity of the water tank is large or the demand for hot water is large, and the refrigerant needs to flow through the outdoor heat exchanger for evaporation).

[0168] Entry conditions:

[0169] 1. The water tank temperature Ttank is less than the maximum operating water temperature Tlimt, and the cooling energy must be less than or equal to Qc.

[0170] 2. The water tank temperature Ttank is lower than the maximum operating water temperature Tlimt, the water supply valve is in the on state, and the water temperature is lower than the Tb temperature.

[0171] Execute action:

[0172] The water tank set temperature is adjusted to the maximum set temperature (after the exit conditions are met, it is adjusted to the original set temperature), and the air conditioner is controlled by full heat recovery.

[0173] Exit Conditions

[0174] 1. The water tank reaches the temperature, or the water temperature reaches Tlimt;

[0175] 2. No refrigeration requirement;

[0176] 3. When the water temperature at the bottom of the water tank is higher than Ta, and any indoor unit is in dehumidification mode, it will enter partial heat recovery mode for t2 seconds.

[0177] 2.3, Cooling mode:

[0178] Entry conditions:

[0179] 1. Water tank temperature Ttank ≥ maximum operating water temperature Tlimt;

[0180] 2. The outdoor unit has energy demand but has not entered any heat recovery mode.

[0181] Execution action: The water tank does not participate in the circulation and normal refrigeration operation is performed.

[0182] Exit conditions:

[0183] 1. No refrigeration energy required;

[0184] 2. Enter full heat or partial heat recovery mode.

[0185] The parameters of the above three modes are described as follows:

[0186] Ttank is the water tank temperature, which is the average value of the upper water temperature sensor and the lower water temperature sensor of the water tank, and is detected and calculated in real time.

[0187] Tlimt is a parameter value, which is set in the program and can range from 55 to 70°C.

[0188] Ta is a parameter value, and the value range can be 30-50℃.

[0189] Tb is a parameter value, and the value range may be 25-50°C.

[0190] t1 is a parameter value, which can range from 30 seconds to 10 minutes.

[0191] t2 is a parameter value, which can range from 30 seconds to 10 minutes.

[0192] Qc is a value related to water temperature. When the water temperature is high, Qc is low. When the water temperature is low, Qc is high, as shown in Table 1 below:

[0193] Water temperature range Less than a a~b b~c Greater than c Qc value Qc-1 Qc-2 Qc-2 0

[0194] Table 1

[0195] Among them, Qc-1>Qc-2>Qc-3 is satisfied.

[0196] a, b, c Qc-1, Qc-2, Qc-3 are all parameter values ​​and can be set according to the situation of the external unit.

[0197] Based on the control method of the heat recovery system in the above-mentioned embodiments, the embodiments of the present application have the following technical effects:

[0198] 1. When there is a demand for cooling, adjust the water tank demand and operate the outdoor unit in a heat recovery mode to the maximum extent, which saves energy while preventing excessive heat from being discharged into the atmosphere and causing a heat island effect.

[0199] 2. When dehumidification is required, if the water temperature is too high, proceed in partial heat recovery mode to prevent poor dehumidification effect.

[0200] 3. When there is a demand for water, adopt the full heat recovery mode to ensure the water boiling rate and keep the water tank temperature constant.

[0201] Based on the control methods of the heat recovery system of the above-mentioned various embodiments, various embodiments of the controller, heat recovery system, computer-readable storage medium and computer program product of the present application are respectively proposed below.

[0202] like Fig.15 As shown, Fig.15 900 is a schematic diagram of a controller for executing a control method for a heat recovery system provided by an embodiment of the present application. The controller 900 implemented in the present application includes: a processor 910, a memory 920, and a computer program stored in the memory 920 and executable on the processor 910, wherein: Fig.15 In the figure, a processor 910 and a memory 920 are taken as an example.

[0203] The processor 910 and the memory 920 may be connected via a bus or other means. Fig.15 The example of connecting through bus is taken in the following.

[0204] The memory 920, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 920 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 920 may optionally include a memory 920 remotely arranged relative to the processor 910, and these remote memories 920 may be connected to the controller 900 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0205] Those skilled in the art will understand that Fig.15 The device structure shown in the figure does not constitute a limitation on the controller 900, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0206] exist Fig.15 In the controller 900 shown, the processor 910 can be used to call the control program stored in the memory 920, so as to implement the control method of the heat recovery system described above. Specifically, the non-transient software program and instructions required to implement the control method of the heat recovery system of the above embodiment are stored in the memory 920, and when executed by the processor 910, the control method of the heat recovery system of the above embodiment is executed.

[0207] It is worth noting that since the controller 900 of the embodiment of the present application can execute the control method of the heat recovery system of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the controller 900 of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the heat recovery system of any of the above-mentioned embodiments.

[0208] In addition, an embodiment of the present application further provides a heat recovery system, which includes the controller of the above embodiment.

[0209] It is worth noting that since the heat recovery system of the embodiment of the present application includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment is capable of executing the control method of the heat recovery system of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the heat recovery system of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the heat recovery system of any of the above-mentioned embodiments.

[0210] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the control method of the heat recovery system described above. Figures 4 to 14 The method steps in .

[0211] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the heat recovery system of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the heat recovery system of any of the above-mentioned embodiments.

[0212] In addition, an embodiment of the present application further provides a computer program product, including a computer program or a computer instruction, the computer program or the computer instruction is stored in a computer-readable storage medium, the processor of the computer device reads the computer program or the computer instruction from the computer-readable storage medium, and the processor executes the computer program or the computer instruction, so that the computer device executes the control method of the heat recovery system described above. Figures 4 to 14 The method steps in .

[0213] It is worth noting that since the computer program product of the embodiment of the present application can execute the control method of the heat recovery system of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer program product of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the heat recovery system of any of the above-mentioned embodiments.

[0214] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0215] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0216] In several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of apparatuses or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0217] It should also be understood that the various implementation methods provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0218] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a heat recovery system, characterized in that: The heat recovery system comprises an outdoor unit, an indoor unit and a water tank, wherein the outdoor unit, the indoor unit and the water tank are connected via a refrigerant pipeline; the method comprises: In the case where the indoor unit has a cooling demand, when it is determined that the water tank has an active heat recovery function, obtaining the indoor unit state of the indoor unit and the water tank state of the water tank; A target operating mode is determined according to the state of the indoor unit and the state of the water tank, and the heat recovery system is controlled to execute the target operating mode, wherein the target operating mode includes one of the following: partial heat recovery mode, full heat recovery mode, and cooling mode.

2. The method according to claim 1, characterized in that The determining the target operation mode according to the state of the indoor unit and the state of the water tank includes: When the state of the indoor unit and the state of the water tank meet the first entry condition, the target operation mode is determined to be the partial heat recovery mode; wherein the first entry condition includes at least one of the following: The cooling energy requirement of the indoor unit is greater than the preset energy requirement, and the water tank temperature of the water tank is less than the preset maximum operable water temperature; The operation mode of at least one of the indoor units is the dehumidification mode, the water tank temperature of the water tank is lower than the preset maximum operable water temperature, and the water temperature at the lower part of the water tank is higher than the first preset temperature.

3. The method according to claim 2, characterized in that The method further comprises: In the case where the heat recovery system executes the partial heat recovery mode, when a first exit condition is met, the heat recovery system is controlled to exit the partial heat recovery mode; wherein the first exit condition includes at least one of the following: The water tank temperature is greater than or equal to the water tank set temperature; The water tank temperature is greater than or equal to the maximum operable water temperature; The cooling energy of the indoor unit needs to be zero; The water supply valve of the water tank is in an on state, and the temperature of the water tank remains lower than the second preset temperature for a first preset time period.

4. The method according to claim 2, characterized in that: The determining of the target operation mode according to the state of the indoor unit and the state of the water tank further includes: When the state of the indoor unit and the state of the water tank meet the second entry condition, the target operation mode is determined to be the full heat recovery mode; wherein the second entry condition includes at least one of the following: The cooling energy requirement of the indoor unit is less than or equal to the preset energy requirement, and the water tank temperature of the water tank is less than the preset maximum operable water temperature; The water replenishment valve of the water tank is in an on state, and the water tank temperature is lower than a second preset temperature, and the water tank temperature of the water tank is lower than a preset maximum operable water temperature.

5. The method according to claim 4, characterized in that The method further comprises: In the case where the heat recovery system executes the full heat recovery mode, when a second exit condition is met, the heat recovery system is controlled to exit the full heat recovery mode; wherein the second exit condition includes at least one of the following: The water tank temperature is greater than or equal to the water tank set temperature; The water tank temperature is greater than or equal to the maximum operable water temperature; The cooling energy of the indoor unit needs to be zero; During the second preset time period, the operation mode of at least one of the indoor units is the dehumidification mode, and the water temperature at the lower part of the water tank is maintained greater than the first preset temperature.

6. The method according to claim 2 or 4, characterized in that: After determining the target operation mode according to the state of the indoor unit and the state of the water tank, the method further includes: Get the water tank set temperature; The water tank set temperature is adjusted to be the maximum set temperature.

7. The method according to claim 4, characterized in that The determining of the target operation mode according to the state of the indoor unit and the state of the water tank further includes: When the indoor unit state and the water tank state meet the third entry condition, the target operation mode is determined to be the cooling mode; wherein the third entry condition includes at least one of the following: The water tank temperature of the water tank is greater than or equal to the preset maximum operable water temperature; The outdoor unit has energy demand, and the heat recovery system is not currently executing the partial heat recovery mode or the full heat recovery mode.

8. The method according to claim 7, characterized in that The method further comprises: In the case where the heat recovery system executes the cooling mode, when a third exit condition is met, the heat recovery system is controlled to exit the cooling mode; wherein the third exit condition includes at least one of the following: The cooling energy of the indoor unit needs to be zero; The heat recovery system satisfies the first entry condition or the second entry condition.

9. The method according to claim 2, characterized in that: The water tank temperature is determined by the following steps: Obtaining the water temperature at the upper part of the water tank and the water temperature at the lower part of the water tank; The average water temperature of the upper water tank and the lower water tank is calculated, and the average water temperature is used as the water tank temperature.

10. The method according to claim 2, characterized in that The preset energy can be determined by the following steps: Determine the water temperature interval of the water tank temperature according to the water tank temperature; The preset energy requirement is determined according to the water temperature range, wherein there is a negative correlation between the preset energy requirement and the water temperature range.

11. The method according to claim 1, characterized in that: include: In the partial heat recovery mode, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing coils, and the indoor unit coil of the indoor unit is used as an evaporating coil; In the full heat recovery mode, the water tank coil of the water tank serves as a condensing coil, and the indoor coil of the indoor unit and the outdoor coil of the outdoor unit both serve as evaporating coils; In the cooling mode, the outdoor unit coil of the outdoor unit serves as a condensing coil, the indoor unit coil of the indoor unit serves as an evaporating coil, and the refrigerant stops flowing through the water tank coil of the water tank.

12. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for a heat recovery system according to any one of claims 1 to 11 when executing the computer program.

13. A heat recovery system, characterized in that: Comprising a controller as claimed in claim 12.

14. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method of the heat recovery system according to any one of claims 1 to 11.

15. A computer program product comprising a computer program or computer instructions, characterized in that The computer program or the computer instructions are stored in a computer-readable storage medium, and a processor of a computer device reads the computer program or the computer instructions from the computer-readable storage medium. The processor executes the computer program or the computer instructions, so that the computer device executes the control method of the heat recovery system as described in any one of claims 1 to 11.

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