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. The heat recovery system comprises a water tank, an outdoor unit, an indoor unit and a control valve, and the control valve comprises a first valve used for adjusting the flow of a refrigerant flowing through a water tank coil and a second valve used for adjusting the flow of a refrigerant flowing through an outdoor unit coil; under the condition that the heat recovery system executes the partial heat recovery mode, a target priority mode is obtained, and the target priority mode comprises a refrigeration priority mode or a water heating priority mode; and the opening degree of a control valve is adjusted according to the target priority mode so as to distribute the refrigerant flow flowing through the water tank coil pipe and the outdoor unit coil pipe. The heat recovery system can rapidly adjust the opening degree of the control valve through refrigeration priority and heating priority control, it is guaranteed that refrigerants of the water tank coil and the outdoor unit coil are reasonably distributed, the heat exchange efficiency is improved, the system operation energy efficiency is improved, and the actual requirements of users are met.

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 art, heat recovery air conditioners have multiple operating modes, including a partial heat recovery mode; specifically, in the partial heat recovery mode, there are two condensing parts, namely, the water tank coil of the water tank and the outdoor unit coil are both used as condensing parts, and the indoor coil of the indoor unit is used as an evaporation part. However, the existing partial heat recovery solution does not effectively select the cooling effect or the heating effect priority control according to the user's usage habits, and the heat exchange efficiency is poor. Summary of the invention

[0003] 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, controller, heat recovery system and medium for a heat recovery system, aiming to improve the heat exchange efficiency and the energy efficiency of the system operation to meet the actual needs of users.

[0004] 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 a water tank, an outdoor unit, an indoor unit, and a control valve, wherein a water tank coil of the water tank, an outdoor unit coil of the outdoor unit, and an indoor unit coil of the indoor unit are connected via a refrigerant pipeline, and the control valve includes a first valve and / or a second valve, wherein the first valve is used to adjust the refrigerant flow through the water tank coil, and the second valve is used to adjust the refrigerant flow through the outdoor unit coil; the method includes:

[0005] When the heat recovery system executes a partial heat recovery mode, acquiring a target priority mode, wherein the target priority mode includes a cooling priority mode or a hot water priority mode;

[0006] The opening of the control valve is adjusted according to the target priority mode to distribute the refrigerant flow rates flowing through the water tank coil and the outdoor unit coil respectively.

[0007] According to some embodiments of the present application, adjusting the opening of the control valve according to the target priority mode includes:

[0008] When the target priority mode is the cooling priority mode, obtaining a first refrigerant outlet temperature of the water tank coil and a second refrigerant outlet temperature of the outdoor unit coil;

[0009] The opening of the control valve is adjusted according to the first refrigerant outlet temperature and the second refrigerant outlet temperature.

[0010] According to some embodiments of the present application, when the control valve includes a first valve, adjusting the opening of the control valve according to the first refrigerant outlet temperature and the second refrigerant outlet temperature includes:

[0011] determining an average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature;

[0012] A first temperature difference between the first refrigerant outlet temperature and the refrigerant outlet average temperature is calculated, and the opening of the first valve is adjusted according to the first temperature difference, wherein the opening of the first valve is negatively correlated with the first temperature difference.

[0013] According to some embodiments of the present application, when the control valve includes a second valve, adjusting the opening of the control valve according to the first refrigerant outlet temperature and the second refrigerant outlet temperature includes:

[0014] determining an average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature;

[0015] A second temperature difference between the second refrigerant outlet temperature and the refrigerant outlet average temperature is calculated, and the opening of the second valve is adjusted according to the second temperature difference, wherein the opening of the second valve is negatively correlated with the second temperature difference.

[0016] According to some embodiments of the present application, when the control valve includes a first valve, adjusting the opening of the control valve according to the target priority mode includes:

[0017] When the target priority mode is the hot water priority mode, the opening degree of the first valve is set to a preset maximum allowable opening degree.

[0018] According to some embodiments of the present application, when the control valve includes a second valve, adjusting the opening of the control valve according to the target priority mode includes:

[0019] When the target priority mode is a hot water priority mode, obtaining a condensing pressure of the outdoor unit, and determining a corresponding saturation temperature according to the condensing pressure;

[0020] The opening of the second valve is adjusted according to the saturation temperature and a preset target condensation temperature.

[0021] According to some embodiments of the present application, adjusting the opening of the second valve according to the saturation temperature and a preset target condensing temperature includes:

[0022] calculating a third temperature difference between the saturation temperature and the target condensation temperature;

[0023] The opening of the second valve is adjusted according to the third temperature difference, wherein there is a positive correlation between the opening of the second valve and the third temperature difference.

[0024] According to some embodiments of the present application, before acquiring the target priority mode, the method further includes:

[0025] Initializing the openings of the first valve and the second valve to set the opening of the first valve to a first starting opening, and to set the opening of the second valve to a second starting opening;

[0026] When the first valve is at a first start-up opening degree and the second valve is at a second start-up opening degree, the heat recovery system is controlled to execute a partial heat recovery mode and maintain the mode for at least a preset time period.

[0027] According to some embodiments of the present application, 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.

[0028] 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.

[0029] In a third aspect, an embodiment of the present application provides a heat recovery system, comprising the controller of the second aspect described above.

[0030] 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.

[0031] 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.

[0032] According to the technical solution of the embodiment of the present application, at least the following beneficial effects are achieved: the heat recovery system includes a first valve for adjusting the refrigerant flow through the water tank coil, and a second valve for adjusting the refrigerant flow through the outdoor unit coil; when the heat recovery system executes a partial heat recovery mode, the target priority mode is first obtained, and it is determined whether the target priority mode is a cooling priority mode or a hot water priority mode. Then, the heat recovery system adjusts the opening of the first valve and / or the second valve according to the target priority mode to distribute the refrigerant flow through the water tank coil and the outdoor unit coil, respectively. The embodiment of the present application can quickly adjust the opening of the control valve through cooling priority and heating priority control to ensure reasonable refrigerant distribution of the water tank coil and the outdoor unit coil, while improving heat exchange efficiency and improving system operation energy efficiency to meet actual user needs.

[0033] 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

[0034] 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.

[0035] Figure 1 is a structural schematic diagram of a heat recovery system provided by an embodiment of the present application;

[0036] Figure 2 is a flow diagram of a heat recovery system in a partial heat recovery mode provided by an embodiment of the present application;

[0037] Figure 3 is a flow chart of a control method for a heat recovery system provided by an embodiment of the present application;

[0038] Figure 4 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0039] Figure 5 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0040] Figure 6 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0041] Figure 7 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0042] Figure 8 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0043] Fig. 9 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0044] Fig.10 is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application;

[0045] Fig.11 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

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In some cases, heat recovery air conditioners have multiple operating modes, including a partial heat recovery mode; specifically, in the partial heat recovery mode, there are two condensing parts, namely, the water tank coil of the water tank and the outdoor unit coil of the outdoor unit are both used as condensing parts, and the indoor coil of the indoor unit is used as an evaporation part. However, the existing partial heat recovery solution does not effectively select whether to prioritize cooling effect or heating effect according to the user's usage habits, and the heat exchange efficiency is poor.

[0051] Based on the above situation, the embodiments of the present application propose a control method, controller, heat recovery system and medium for a heat recovery system, aiming to improve the heat exchange efficiency and enhance the energy efficiency of system operation to meet the actual needs of users.

[0052] The various embodiments of the heat recovery system of the present application are further described below in conjunction with the accompanying drawings.

[0053] like Figure 1 to Figure 2 As shown, Figure 1 is a schematic diagram of the structure of a heat recovery system provided by an embodiment of the present application, Figure 2 It is a flow diagram of a heat recovery system in a partial heat recovery mode provided by an embodiment of the present application.

[0054] In one embodiment, the heat recovery system includes an indoor device and an outdoor device, wherein the indoor device includes Figure 1 The indoor unit 100 and the water tank 300 shown in FIG. 1 , the outdoor equipment includes Figure 1 In the outdoor unit shown in the figure, the outdoor unit's outdoor coil, the indoor unit coil of the indoor unit 100 and the water tank coil of 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.

[0055] 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 1 The 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.

[0056] In one embodiment, if Figure 1 As shown, the throttling component includes multiple control valves, wherein the control valves include a first valve 800, a second valve 600 and a third valve 700. Specifically, the first valve 800 is used to adjust the refrigerant flow through the water tank coil, the second valve 600 is used to adjust the refrigerant flow through the outdoor unit coil, and the third valve 700 is used to adjust the refrigerant flow through the indoor unit coil.

[0057] It can be understood that the first valve 800 , the second valve 600 and the third valve 700 may be electronic expansion valves.

[0058] 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 third valve 700, and the third valve 700 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 third valve 700 and the second valve 600 through the first valve 800, and by controlling the first valve 800, the refrigerant flow input to each third valve 700 can be controlled.

[0059] like Figure 2 As shown, in 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 second valve 600 and the third valve 700 are in the open state, so the condensed refrigerant passes through the second valve 600 and the third valve 700 to enter each indoor unit 100 for evaporation treatment; and 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 valve 800 and the third valve 700 are in the open state, so the condensed refrigerant passes through the first valve 800 and the third 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.

[0060] 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.

[0061] like Figure 3 As shown, Figure 3 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 S310 and step S320.

[0062] Step S310: when the heat recovery system executes the partial heat recovery mode, obtaining a target priority mode, wherein the target priority mode includes a cooling priority mode or a hot water priority mode;

[0063] Step S320: adjusting the opening of the control valve according to the target priority mode to distribute the refrigerant flow rates flowing through the water tank coil and the outdoor unit coil respectively.

[0064] In one embodiment, when the heat recovery system executes a partial heat recovery mode, the target priority mode is first obtained, and it is determined whether the target priority mode is a cooling priority mode or a hot water priority mode. Then, the heat recovery system adjusts the opening of the first valve and / or the second valve according to the target priority mode to distribute the refrigerant flow through the water tank coil and the outdoor unit coil, respectively. The embodiment of the present application can quickly adjust the opening of the control valve through cooling priority and heating priority control to ensure reasonable refrigerant distribution between the water tank coil and the outdoor unit coil, while improving heat exchange efficiency and improving system operation energy efficiency to meet actual user needs.

[0065] In one embodiment, the cooling priority mode refers to a mode in which the indoor unit is preferentially used to quickly cool the room; and the hot water priority mode refers to a mode in which the water tank is preferentially heated.

[0066] It can be understood that 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.

[0067] In addition, if Figure 4 As shown, Figure 4 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; regarding adjusting the opening of the control valve according to the target priority mode in the above step S320, it may include but is not limited to step S410 and step S420.

[0068] Step S410: when the target priority mode is the cooling priority mode, obtaining a first refrigerant outlet temperature of the water tank coil and a second refrigerant outlet temperature of the outdoor unit coil;

[0069] Step S420, adjusting the opening of the control valve according to the first refrigerant outlet temperature and the second refrigerant outlet temperature.

[0070] In one embodiment, when the heat recovery system is operating in a partial heat recovery mode, if cooling is currently prioritized, a first refrigerant outlet temperature on the refrigerant outlet side of the water tank coil can be detected by a temperature sensor, and a second refrigerant outlet temperature on the refrigerant outlet side of the outdoor unit coil can be detected by a temperature sensor. Then, the first refrigerant outlet temperature and the second refrigerant outlet temperature are analyzed and compared to adjust the opening of the control valve.

[0071] In addition, it should be noted that the valve opening adjustment in the above step S420 may include but is not limited to: Figure 5 or Figure 6 The two implementations shown are as follows:

[0072] like Figure 5 As shown, Figure 5It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; when the control valve includes a first valve, the above-mentioned step S420 may include but is not limited to step S510 and step S520.

[0073] Step S510, determining the average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature;

[0074] Step S520, calculating a first temperature difference between the first refrigerant outlet temperature and the refrigerant outlet average temperature, and adjusting the opening of the first valve according to the first temperature difference, wherein the opening of the first valve is negatively correlated with the first temperature difference.

[0075] In one embodiment, if the current mode is cooling priority, the adjustment logic of the first valve is as follows: first, the refrigerant outlet average temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature is calculated, and then the first temperature difference between the first refrigerant outlet temperature and the refrigerant outlet average temperature is calculated. If the first temperature difference is within a reasonable preset temperature range, the opening of the first valve is kept unchanged; if the first temperature difference is higher than the reasonable preset temperature range, the opening of the first valve is reduced, and the larger the first temperature difference, the larger the reduction; if the first temperature difference is lower than the reasonable preset temperature range, the opening of the first valve is increased, and the smaller the first temperature difference, the larger the increase.

[0076] 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; when the control valve includes a second valve, the above-mentioned step S420 may include but is not limited to step S610 and step S620.

[0077] Step S610, determining the average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature;

[0078] Step S620, calculating a second temperature difference between the second refrigerant outlet temperature and the refrigerant outlet average temperature, and adjusting the opening of the second valve according to the second temperature difference, wherein the opening of the second valve is negatively correlated with the second temperature difference.

[0079] In one embodiment, if the current mode is cooling priority, the adjustment logic of the second valve is as follows: first, the refrigerant outlet average temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature is calculated, and then the second temperature difference between the second refrigerant outlet temperature and the refrigerant outlet average temperature is calculated. If the second temperature difference is within a reasonable preset temperature range, the opening of the second valve is kept unchanged; if the second temperature difference is higher than the reasonable preset temperature range, the opening of the second valve is reduced, and the larger the second temperature difference, the larger the reduction; if the second temperature difference is lower than the reasonable preset temperature range, the opening of the second valve is increased, and the smaller the second temperature difference, the larger the increase.

[0080] In addition, it should be noted that, regarding the above step S320, adjusting the opening of the control valve according to the target priority mode, in the hot water priority mode, it may include but is not limited to: Figure 7 or Figure 8 The two implementations shown are as follows:

[0081] like Figure 7 As shown, Figure 7 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; when the control valve includes a first valve, the above-mentioned step S320 may include but is not limited to step S710 and step S720.

[0082] Step S710, determining that the target priority mode is a hot water priority mode;

[0083] Step S720: setting the opening of the first valve to a preset maximum allowable opening.

[0084] In one embodiment, if the current mode is hot water production priority, in order to make the heat exchange efficiency of the water tank coil higher, the refrigerant flow rate flowing through the water tank coil can be increased accordingly, that is, the opening of the first valve can be set to a preset maximum allowable opening.

[0085] like Figure 8 As shown, Figure 8 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; when the control valve includes a second valve, the above-mentioned step S320 may include but is not limited to step S810 and step S820.

[0086] Step S810: when the target priority mode is the hot water priority mode, obtain the condensing pressure of the outdoor unit, and determine the corresponding saturation temperature according to the condensing pressure;

[0087] Step S820: adjusting the opening of the second valve according to the saturation temperature and the preset target condensation temperature.

[0088] In one embodiment, if the current mode is hot water making priority mode, the adjustment logic of the second valve is as follows: first, the condensing pressure of the outdoor unit is detected by a pressure sensor, and then the corresponding saturation temperature is calculated according to the condensing pressure, and then the saturation temperature is compared with the preset target condensing temperature, and finally the opening of the second valve is adjusted according to the comparison result.

[0089] It can be understood that the above-mentioned preset target condensation temperature can be pre-set, and the embodiments of the present application do not specifically limit this.

[0090] In addition, if Fig. 9 As shown, Fig. 9 It is a flow chart of a control method for a heat recovery system provided by another embodiment of the present application; regarding the above-mentioned step S820, it may include but is not limited to step S910 and step S920.

[0091] Step S910, calculating a third temperature difference between the saturation temperature and the target condensation temperature;

[0092] Step S920: adjusting the opening of the second valve according to the third temperature difference, wherein there is a positive correlation between the opening of the second valve and the third temperature difference.

[0093] In one embodiment, if the current mode is hot water making priority mode, the adjustment logic of the second valve is as follows: first, the third temperature difference between the saturation temperature and the target condensing temperature is calculated. If the third temperature difference is within a reasonable preset temperature range, the opening of the second valve is kept unchanged; if the third temperature difference is higher than the reasonable preset temperature range, the opening of the second valve is increased, and the larger the third temperature difference is, the larger the increase is; if the third temperature difference is lower than the reasonable preset temperature range, the opening of the second valve is reduced, and the smaller the third temperature difference is, the larger the reduction is.

[0094] In addition, if Fig.10 As shown, Fig.10 It is a flowchart of a control method for a heat recovery system provided by another embodiment of the present application; before acquiring the target priority mode, the method also includes but is not limited to step S1010 and step S1020.

[0095] Step S1010, initializing the openings of the first valve and the second valve, so as to set the opening of the first valve to a first starting opening, and to set the opening of the second valve to a second starting opening;

[0096] Step S1020: When the first valve is at the first start-up opening degree and the second valve is at the second start-up opening degree, control the heat recovery system to execute a partial heat recovery mode and maintain it for at least a preset time.

[0097] In one embodiment, at the initial stage of starting the partial heat recovery mode, the embodiment of the present application will open the first valve and the second valve to a certain starting opening degree respectively, and maintain it for a preset time, so that the heat recovery system enters a stable state.

[0098] It can be understood that the above-mentioned preset time length can be pre-set, and the embodiment of the present application does not specifically limit the value of the preset time length.

[0099] 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.

[0100] In one embodiment, the technical solution of the embodiment of the present application is mainly to realize the priority processing of the cooling effect and the hot water effect of the electronic expansion valve in a partial heat recovery mode. Among them, the partial heat recovery principle can be as follows Figure 2 As shown. After being compressed by the compressor, the refrigerant is divided into two paths, one is condensed by the outdoor unit condenser, and the other is condensed by the water tank heat exchange. The condensed refrigerants are mixed and sent to the evaporator through the throttling valve of the internal unit. After evaporation, they return to the compressor to form a cycle. In some heat recovery systems, the water tank and the condenser are both used as condensing components. The water tank heats and cools the high-temperature refrigerant at the same time, realizing heat recovery, improving energy utilization, and thus improving system energy efficiency.

[0101] Specifically, the control method of the embodiment of the present application is as follows:

[0102] In the partial heat recovery mode, since there are two condensing components, namely the outdoor unit coil and the water tank coil, it is necessary to reasonably control the opening of the electronic expansion valve corresponding to the water tank and the outdoor unit main valve to ensure appropriate refrigerant flow distribution and make the system more energy-efficient, thereby achieving priority processing of user cooling effect and hot water effect. The control logic is as follows:

[0103] 1. Control logic of the water tank valve (corresponding to the first valve mentioned above):

[0104] (1) Initialization control:

[0105] The water tank sub-valve initialization opening is P_init1 (such as 400-480 degrees of opening), maintained for Tm_init1 (such as 0-10min), and then automatically controlled according to cooling priority or heating priority.

[0106] The water tank sub-valve automatically controls the opening range ∈[P_min1, P_max1] (P_min1 can be 0-100, P_max1 can be 400-480).

[0107] (2) Refrigeration priority: T3 modified control rules:

[0108] After the water tank valve completes the initial operation according to the initial opening, it enters T3 correction control and is adjusted once every Tm_cycle (such as 0-3min). The specific control is shown in Table 1 below:

[0109] T3_1: outlet temperature of the refrigerant side of the water tank heat exchanger;

[0110] T3_2: outdoor unit condenser outlet temperature;

[0111] T3_avg: Average temperature of the refrigerant side of the water tank heat exchanger and the outdoor unit condenser outlet.

[0112] condition Opening change 2℃<T3_1—T3_avg -9 1<T3_1—T3_avg≤2℃ -5 -1≤T3_1—T3_avg≤1℃ 0 -3≤T3_1—T3_avg<-1℃ 4 T3_1—T3_avg<-3℃ 8

[0113] Table 1

[0114] (3) Heating priority: The water tank valve opening is P_max1 (e.g. 400-480 degrees).

[0115] 2. Control logic of the external machine main valve (corresponding to the second valve mentioned above):

[0116] (1) Initialization control:

[0117] The initial opening of the main valve of the outdoor unit is P_init2 (such as 400-480 degrees), and it is maintained for Tm_init2 (such as 0-10min). After that, it is automatically controlled according to cooling priority or heating priority.

[0118] The automatic control opening range of the external machine main valve is [P_min2, P_max2] (P_min2 can be 0-100, P_max2 can be 400-480).

[0119] (2) Refrigeration priority: T3 correction control

[0120] After the main valve of the external machine completes the initial operation according to the initial opening, it enters T3 correction control and is adjusted once every Tm_cycle (such as 0-3min). The specific control is shown in Table 2 below:

[0121] T3_1: outlet temperature of the refrigerant side of the water tank heat exchanger;

[0122] T3_2: outdoor unit condenser outlet temperature;

[0123] T3_avg: Average temperature of the refrigerant side of the water tank heat exchanger and the outdoor unit condenser outlet.

[0124] condition Opening change 2℃<T3_2—T3_avg -9 1<T3_2—T3_avg≤2℃ -5 -1≤T3_2—T3_avg≤1℃ 0 -3≤T3_2—T3_avg<-1℃ 4 T3_2—T3_avg<-3℃ 8

[0125] Table 2

[0126] (3) Heating priority: high pressure control

[0127] After the main valve of the external unit completes the initial operation according to the initial opening, it enters the high pressure control and is adjusted once every Tm_cycle (such as 0-3min). The adjustment method is: current expansion valve opening = original opening + change opening △X.

[0128] Among them, the change of opening △X is controlled according to the following table 3:

[0129] TC is the saturation temperature corresponding to the condensing pressure detected by the system in real time;

[0130] TCS is the target condensation temperature (eg, 55-60°C).

[0131] condition Opening change TCS+5<TC Open directly to the maximum opening TCS+2<TC≤TCS+5 12 TCS+1<TC≤TCS+2 6 TCS-1<TC≤TCS+1 0 TCS-2<TC≤TCS-1 -5 TC≤TCS-2 -9

[0132] Table 3

[0133] The technical solution of the embodiment of the present application quickly adjusts the opening of the electronic expansion valve through cooling priority and heating priority control, ensuring reasonable distribution of refrigerant between the water tank and the condenser, while improving heat exchange efficiency and enhancing system operation energy efficiency to meet actual user needs.

[0134] 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.

[0135] like Fig.11 As shown, Fig.11 900 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.11 In the figure, a processor 910 and a memory 920 are taken as an example.

[0136] The processor 910 and the memory 920 may be connected via a bus or other means. Fig.11 The example of connecting through bus is taken in the following.

[0137] 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.

[0138] Those skilled in the art will understand that Fig.11 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.

[0139] exist Fig.11 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.

[0140] 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.

[0141] In addition, an embodiment of the present application further provides a heat recovery system, which includes the controller of the above embodiment.

[0142] 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.

[0143] 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 3 to 10 The method steps in .

[0144] 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.

[0145] 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 3 to 10 The method steps in .

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0151] 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 a water tank, an outdoor unit, an indoor unit, and a control valve. The water tank coil of the water tank, the outdoor unit coil and the indoor unit coil are connected through a refrigerant pipeline. The control valve comprises a first valve and / or a second valve. The first valve is used to adjust the refrigerant flow through the water tank coil, and the second valve is used to adjust the refrigerant flow through the outdoor unit coil. The method comprises: When the heat recovery system executes a partial heat recovery mode, acquiring a target priority mode, wherein the target priority mode includes a cooling priority mode or a hot water priority mode; The opening of the control valve is adjusted according to the target priority mode to distribute the refrigerant flow rates flowing through the water tank coil and the outdoor unit coil respectively.

2. The method according to claim 1, characterized in that The adjusting the opening of the control valve according to the target priority mode includes: When the target priority mode is the cooling priority mode, obtaining a first refrigerant outlet temperature of the water tank coil and a second refrigerant outlet temperature of the outdoor unit coil; The opening of the control valve is adjusted according to the first refrigerant outlet temperature and the second refrigerant outlet temperature.

3. The method according to claim 2, characterized in that In the case where the control valve includes a first valve, adjusting the opening of the control valve according to the first refrigerant outlet temperature and the second refrigerant outlet temperature includes: determining an average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature; A first temperature difference between the first refrigerant outlet temperature and the refrigerant outlet average temperature is calculated, and the opening of the first valve is adjusted according to the first temperature difference, wherein the opening of the first valve is negatively correlated with the first temperature difference.

4. The method according to claim 2, characterized in that: In the case where the control valve includes a second valve, adjusting the opening of the control valve according to the first refrigerant outlet temperature and the second refrigerant outlet temperature includes: determining an average refrigerant outlet temperature of the first refrigerant outlet temperature and the second refrigerant outlet temperature; A second temperature difference between the second refrigerant outlet temperature and the refrigerant outlet average temperature is calculated, and the opening of the second valve is adjusted according to the second temperature difference, wherein the opening of the second valve is negatively correlated with the second temperature difference.

5. The method according to claim 1, characterized in that In a case where the control valve includes a first valve, adjusting the opening of the control valve according to the target priority mode includes: When the target priority mode is the hot water priority mode, the opening degree of the first valve is set to a preset maximum allowable opening degree.

6. The method according to claim 1, characterized in that In the case where the control valve includes a second valve, adjusting the opening of the control valve according to the target priority mode includes: When the target priority mode is a hot water priority mode, obtaining a condensing pressure of the outdoor unit, and determining a corresponding saturation temperature according to the condensing pressure; The opening of the second valve is adjusted according to the saturation temperature and a preset target condensation temperature.

7. The method according to claim 6, characterized in that The adjusting the opening of the second valve according to the saturation temperature and the preset target condensation temperature includes: calculating a third temperature difference between the saturation temperature and the target condensation temperature; The opening of the second valve is adjusted according to the third temperature difference, wherein there is a positive correlation between the opening of the second valve and the third temperature difference.

8. The method according to claim 1, characterized in that Before acquiring the target priority mode, the method further includes: Initializing the openings of the first valve and the second valve to set the opening of the first valve to a first starting opening, and to set the opening of the second valve to a second starting opening; When the first valve is at a first start-up opening degree and the second valve is at a second start-up opening degree, the heat recovery system is controlled to execute a partial heat recovery mode and maintain the mode for at least a preset time period.

9. The method according to claim 1, characterized in that: 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.

10. 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 9 when executing the computer program.

11. A heat recovery system, characterized in that: Comprising a controller as claimed in claim 10.

12. 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 9.

13. 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 9.

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