Temperature control method and device for air conditioner, air conditioning system and computer readable storage medium

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a temperature control method for an air conditioner, and indoor units comprise a plurality of indoor units distributed in different rooms; the method comprises the steps that under the condition that heating and refrigerating requirements exist in a plurality of rooms correspondingly, the total heating demand and the total refrigerating demand are calculated according to the environment temperature and the target temperature of each room; a target operation mode of the air conditioner is determined according to the heating total demand quantity and the refrigeration total demand quantity; controlling operation parameters of the air conditioner according to the target operation mode; wherein the target operation mode comprises a cold and hot operation mode taking refrigeration as a main mode, a cold and hot operation mode taking heating as a main mode or a cold and hot balance mode; the operation parameters of the air conditioner comprise the state of the outdoor unit heat exchanger. According to the method, full utilization of heat or cold is achieved through control over the target operation mode and the state of the outdoor unit, and therefore the operation energy efficiency of the system is improved. The invention further discloses a temperature control device for the air conditioner, an air conditioning system and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the field of smart home appliance technology, for example, to a temperature control method and device for air conditioning, an air conditioning system, and a computer-readable storage medium. Background Art

[0002] For multi-split air conditioning systems, cooling and heating requirements vary across different spaces during transitional seasons. For example, if the elderly require a higher ambient temperature, heating will be required in their rooms. On the other hand, if children and young adults require a lower ambient temperature, cooling will be required in their rooms. In this case, each room in the multi-split air conditioning system is cooled by the evaporator, while the rooms requiring heating are then reheated by heating coils or reheat evaporators before supplying air. However, the use of heating coils or reheat evaporators, as well as the consumption of some of the compressor's cooling power in the heated rooms, results in energy waste.

[0003] Related art discloses an air conditioning system, comprising an outdoor unit having an outdoor heat exchanger, a first compressor, and a second compressor, and further comprising a first indoor unit, a second indoor unit, a first four-way valve, and a second four-way valve. By regulating the connection between the valve ports of the first four-way valve and the second four-way valve, the first compressor is connected to the first indoor unit and / or the second indoor unit, and the second compressor is connected to the second indoor unit and / or the first indoor unit. The first indoor unit comprises a first indoor heat exchanger and a second indoor heat exchanger, and the second indoor unit comprises a third indoor heat exchanger and a fourth indoor heat exchanger. Thus, the connection between the air inlet or exhaust port of the first compressor and the first indoor heat exchanger and / or the second indoor heat exchanger, and the connection between the air inlet or exhaust port of the second compressor and the third indoor heat exchanger and / or the fourth indoor heat exchanger are regulated, thereby realizing an operating mode.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] Although the related technology can meet the needs of simultaneous cooling and heating, the air conditioning system needs to be equipped with two compressors, and the two compressors must work simultaneously, which reduces the energy efficiency of the system.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a temperature control method, device, air conditioning system and computer-readable storage medium for air conditioning, which improve the operating energy efficiency of the air conditioning system while meeting the simultaneous cooling and heating needs of the room.

[0009] In some embodiments, the method includes: when there are heating and cooling demands in multiple rooms respectively, calculating the total heating demand and the total cooling demand based on the ambient temperature and target temperature of each room; determining the target operating mode of the air conditioner based on the total heating demand and the total cooling demand; controlling the operating parameters of the air conditioner based on the target operating mode; wherein the target operating mode includes a hot and cold operating mode mainly based on cooling, a hot and cold operating mode mainly based on heating, or a hot and cold balance mode; the operating parameters of the air conditioner include the status of the outdoor unit heat exchanger.

[0010] In some embodiments, the device includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned temperature control method for an air conditioner when running the program instructions.

[0011] In some embodiments, the air conditioning system includes: a compressor, including an intermediate pressure cylinder and a low pressure cylinder; a four-way valve, connected to the exhaust pipe of the compressor and to the suction pipe of the intermediate pressure cylinder; a three-way valve, connected to the exhaust pipe of the compressor and to the suction pipe of the low pressure cylinder; an outdoor heat exchanger, connected to the exhaust pipe of the compressor through the four-way valve; a plurality of indoor units, each of which includes a first indoor heat exchanger and a second indoor heat exchanger connected in parallel; and one end of the first indoor heat exchanger is connected to the exhaust pipe of the compressor through the three-way valve. The first indoor heat exchanger and the second indoor heat exchanger are connected to the outdoor heat exchanger through the first throttle valve and the second throttle valve respectively; the outdoor throttle valve is arranged on the pipeline between the indoor heat exchanger and the outdoor heat exchanger; the temperature control device for air conditioning as mentioned above is electrically connected to the outdoor throttle valve, the first throttle valve, the second throttle valve, the compressor, the four-way valve and the three-way valve.

[0012] In some embodiments, the computer-readable storage medium stores program instructions, and when the program instructions are executed, the computer is used to execute the aforementioned temperature control method for air conditioning.

[0013] The temperature control method, device, air conditioning system, and computer-readable storage medium for air conditioning provided by the embodiments of the present disclosure can achieve the following technical effects:

[0014] In the disclosed embodiment, when cooling and heating are simultaneously required in different indoor spaces, the target operating mode of the air conditioner is determined based on the total cooling and heating demands. The operating parameters of the air conditioner are then controlled based on the target operating mode. Thus, based on the energy (i.e., heat and cooling) demand, a matching operating mode is selected, and the outdoor unit status is controlled. Thus, by controlling the target operating mode and the outdoor unit status, full utilization of heat or cooling is achieved, thereby improving the energy efficiency of the system.

[0015] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0017] Figure 1 is a structural diagram of an air conditioning system provided by an embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram of a temperature control method for an air conditioner provided by an embodiment of the present disclosure;

[0019] Figure 3 is a schematic diagram of another temperature control method for an air conditioner provided by an embodiment of the present disclosure;

[0020] Figure 4 Schematic diagram of the refrigerant flow direction of the air-conditioning system provided by the embodiment of the present disclosure in the cooling and heating operation mode with cooling as the main mode;

[0021] Figure 5 is a schematic diagram of another temperature control method for an air conditioner provided by an embodiment of the present disclosure;

[0022] Figure 6 Schematic diagram of the refrigerant flow direction of the air-conditioning system provided by the embodiment of the present disclosure in the cooling and heating operation mode with heating as the main mode;

[0023] Figure 7 is a schematic diagram of the refrigerant flow direction of the air-conditioning system provided by an embodiment of the present disclosure in a cooling and heating balance mode;

[0024] Figure 8 Schematic diagram of a temperature control device for an air conditioner provided in an embodiment of the present disclosure.

[0025] Reference numerals:

[0026] 10: Compressor; 11: Low-pressure cylinder; 12: Medium-pressure cylinder; 21: Four-way valve; 22: Three-way valve; 23: Outdoor throttle valve; 30: Outdoor heat exchanger; 41~4n: Indoor units; HE11~HEn1: First indoor heat exchanger; HE12~HEn2: Second indoor heat exchanger; EV11~EVn1: First throttle valve; EV12~EVn2: Second throttle valve; V2: Control valve; 70: Dehumidification device for air conditioning; 700: Processor; 701: Memory; 702: Communication interface; 703: Bus. DETAILED DESCRIPTION

[0027] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0028] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0029] Unless otherwise stated, the term "plurality" means two or more.

[0030] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0031] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0032] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0033] Combine Figure 1As shown, an embodiment of the present disclosure provides an air-conditioning system, comprising: a compressor 10, a four-way valve 21, a three-way valve 22, an outdoor heat exchanger 30, an indoor unit 4n, and an outdoor throttle valve EV0. The compressor 10 comprises a low-pressure cylinder 11 and an intermediate-pressure cylinder 12. The four-way valve 21 is connected to the exhaust line of the compressor 10 and to the intake line of the intermediate-pressure cylinder 12. The three-way valve 22 is connected to the exhaust line of the compressor 10 and to the intake line of the low-pressure cylinder 11. The outdoor heat exchanger 30 is connected to the exhaust line of the compressor 10 via the four-way valve 21. Multiple indoor units 4n are installed in each room. Each indoor unit includes a first indoor heat exchanger HEn1 and a second indoor heat exchanger HEn2 connected in parallel. One end of the first indoor heat exchanger HEn1 is connected to the exhaust line of the compressor 10 or the intake line of the low-pressure cylinder 11 via a three-way valve 22, while one end of the second indoor heat exchanger HEn2 is connected to the exhaust line of the compressor 10 or the intake line of the intermediate-pressure cylinder 12 via a four-way valve 21. The other ends of the first and second indoor heat exchangers HEn1 and HEn2 are connected to the outdoor heat exchanger 30 via a first throttle valve EVn1 and a second throttle valve EVn2, respectively. Furthermore, an outdoor throttle valve EV0 is installed on the connecting pipe between the indoor and outdoor heat exchangers, and is located on the outdoor unit side. Each set of indoor heat exchangers is installed in a different indoor space, meaning the air conditioning system is a multi-split system. n represents the number of indoor units, or the number of sets of indoor heat exchangers, where n = 1, 2, etc.

[0034] In the disclosed embodiment, a compressor with double suction and single exhaust is adopted, in which two cylinders are independently arranged inside, each cylinder has its own suction port, and each cylinder compresses independently, but the cylinder speed is the same. When different indoor demands include both cooling demand and heating demand (that is, one or some indoor spaces require cooling, and another or other indoor spaces require heating), the operation mode of the air-conditioning system includes a cooling-based hot and cold operation mode, a heating-based hot and cold operation mode, or a refrigerant balance mode. Among them, the cooling-based hot and cold operation mode means that the sum of the total indoor cooling demand and the compressor power consumption is greater than the total indoor heating demand. Similarly, the heating-based hot and cold operation mode means that the total indoor heating demand is greater than the sum of the total indoor cooling demand and the compressor power consumption. The cooling-hot balance mode means that the total indoor heating demand is equal to the sum of the total indoor cooling demand and the compressor power consumption.

[0035] The operating parameters of the air conditioning system vary between different cooling and heating modes. These include the status of the outdoor heat exchanger, the operating frequency of the compressor, and the control of the refrigerant circulation loop. By controlling the status of the outdoor heat exchanger and the refrigerant circulation loop, the heat in the indoor space can be fully utilized. Cooling energy in a room requiring heating can be released to both the indoor and outdoor areas requiring cooling, or only to the areas requiring cooling (a heating-focused cooling and heating mode or a balanced cooling and heating mode). Alternatively, heat in a room requiring cooling can be released to both the indoor and outdoor areas requiring heating (a cooling-focused heating and cooling mode). In this way, after satisfying both indoor cooling and heating needs (i.e., recovering indoor heat for heating in other rooms or recovering indoor cooling for cooling in other rooms), any excess heat is released outdoors. This improves the system's energy efficiency and allows for simultaneous indoor cooling and heating with a single compressor.

[0036] Optionally, the air conditioning system further includes a temperature control device 70 for air conditioning, which is electrically connected to the outdoor throttle valve, the first throttle valve, the second throttle valve, the compressor, the four-way valve, and the three-way valve. The device is used to control the opening of the throttle valve, the status of the four-way valve and the three-way valve, and the operating frequency of the compressor.

[0037] Based on the above structure, combined with Figure 2 As shown, the embodiment of the present disclosure provides a temperature control method for an air conditioner, comprising:

[0038] S101: When heating and cooling demands exist in multiple rooms, the processor calculates the total heating demand and the total cooling demand according to the ambient temperature and target temperature of each room.

[0039] S102: The processor determines a target operating mode of the air conditioner according to the total heating demand and the total cooling demand.

[0040] S103: The processor controls the operating parameters of the air conditioner according to the target operating mode.

[0041] The target operation mode includes a cooling-based heating and cooling operation mode, a heating-based heating and cooling operation mode, or a cooling and heating balance mode.

[0042] Here, when the air conditioning system receives both a heating command and a cooling command simultaneously, it can calculate the total cooling demand based on the indoor ambient temperature for the cooling demand and the target temperature. It can also calculate the total heating demand based on the indoor ambient temperature for the heating demand and the target temperature. A target operating mode is then determined based on the total heating demand and the total cooling demand. In some embodiments, the target operating mode can be determined based on the equation: total heating capacity = total cooling capacity + compressor power consumption in a heat and cold balance mode. Ideally, the total heating capacity equals the total heating demand, and the total cooling capacity equals the total cooling demand. The compressor power consumption can be the maximum compressor power consumption or determined based on current environmental parameters and set parameters (such as set temperature and set wind speed). If the total heating demand is greater than the sum of the total cooling demand and the compressor power consumption, it indicates a high heating demand, and the target operating mode is a heating-dominated cooling mode. If the total heating demand is less than the sum of the total cooling demand and the compressor power consumption, it indicates a high cooling demand, and the target operating mode is a cooling-dominated cooling mode. In other embodiments, a ratio of the total heating demand to the cooling demand may be calculated, and the ratio may be compared with a set value to determine the target operating mode.

[0043] Finally, based on the target operating mode, the air conditioner's operating parameters are controlled. Specifically, the state of the outdoor heat exchanger, as well as the compressor's operating frequency and refrigerant flow rate, are controlled. This ensures that the air conditioning system's operation matches the target operating mode and appropriately sets the state of the outdoor heat exchanger. The outdoor heat exchanger's state includes whether it is conducting. If conducting, the corresponding components are controlled to operate the outdoor heat exchanger as an evaporator or condenser. In this way, by controlling the outdoor heat exchanger's state and operating mode, indoor cooling or heat is recovered and reused, and excess cooling or heat is released.

[0044] Using the temperature control method for an air conditioner provided by an embodiment of the present disclosure, when cooling and heating demands are simultaneously present in different indoor spaces, the target operating mode of the air conditioner is determined based on the total cooling demand and the total heating demand. Based on the target operating mode, the operating parameters of the air conditioner are then controlled. Thus, based on the energy (i.e., heat and cooling) demand, a matching operating mode is selected, and the outdoor unit state is controlled. Thus, by selecting a matching operating mode and controlling the outdoor unit state, full utilization of heat or cooling is achieved, thereby improving the energy efficiency of the system operation.

[0045] Optionally, in step S102, the processor determines a target operating mode of the air conditioner according to the total heating demand and the total cooling demand, including:

[0046] The processor calculates the actual ratio of the total heating demand to the total cooling demand.

[0047] When the actual ratio is greater than the reference value, the processor determines that the target operation mode of the air conditioner is a cooling and heating operation mode with heating as the main mode.

[0048] When the actual ratio is less than the reference value, the processor determines that the target operation mode of the air conditioner is a cooling and heating operation mode with cooling as the main mode.

[0049] When the actual ratio is equal to the reference value, the processor determines that the target operation mode of the air conditioner is the cooling and heating balance mode.

[0050] The reference value is determined based on the cold and hot balance model.

[0051] Here, a reference value is set, and the actual ratio of the total heating demand to the total cooling demand is compared with the reference value. The reference value is a critical value determined based on the heat and cold balance mode. When the actual ratio is greater than the reference value, it indicates that the total heating demand is large, so the operating mode is heating-primary. When the actual ratio is less than the reference value, it indicates that the total cooling demand is large, so the operating mode is cooling-primary. When the actual ratio is equal to the reference value, the cooling capacity generated by the indoor heating demand can meet the indoor cooling demand and the power consumption of the compressor, so the operating mode is heat and cold balance mode.

[0052] Optionally, in step S102, the processor determines the reference value in the following manner:

[0053] In the cooling and heating balance mode, the processor determines the target power consumption of the compressor and determines to match the total heating capacity and the total cooling capacity under the target power consumption so that the total heating capacity is equal to the sum of the total cooling capacity and the compressor power consumption.

[0054] When the total heating capacity is equal to the sum of the total cooling capacity and the power consumption of the compressor, the processor uses the ratio of the total heating capacity to the total cooling capacity as a reference value.

[0055] Among them, the cold and hot balance mode is an operating mode in which the outdoor heat exchanger is not activated, and the indoor heat exchanger for cooling demand is used as the evaporator, and the indoor heat exchanger for heating demand is used as the condenser.

[0056] Here, the reference value is a dynamic value. Compressor power consumption varies with the compressor's operating frequency; generally, the higher the operating frequency, the greater the compressor power consumption. For the formula: Total heating demand = Total cooling demand + Compressor power consumption, if the compressor power consumption varies, the total indoor heating and cooling demands on either side of the formula will also differ. Consequently, the determined reference value will also differ; that is, the reference value changes dynamically. Therefore, in the disclosed embodiment, in the heat and cooling balance mode, the compressor power consumption, total heating capacity, and total cooling capacity are determined based on the set parameters for indoor demand and the current indoor ambient temperature, such that the relationship between the three satisfies the above formula, thereby obtaining the reference value. The method for determining the compressor power consumption, total heating capacity, and total cooling capacity can be obtained from a database. The database is based on a sufficient number of experiments, under different environmental parameters and different indoor setting parameters, to determine the relationship between the total heating demand, total cooling demand, and compressor power consumption in the heat and cooling balance mode. Alternatively, the compressor power consumption can be determined based on the larger of the total heating demand and total cooling demand calculated above. The other parameter in the above formula is then calculated based on this larger value and the determined power consumption. For example, if the total heating demand is greater than the total cooling demand, the power consumption of the compressor is determined based on the total heating demand, and the matching total cooling demand is determined based on the above formula to obtain the reference value.

[0057] Optionally, the operating parameters of the air conditioner include the state of the outdoor unit heat exchanger; in step S103, the processor controls the operating parameters of the air conditioner according to the target operating mode, including:

[0058] When the target operation mode is a cooling-dominated cooling and heating operation mode, the processor controls the outdoor heat exchanger to be a condenser.

[0059] When the target operation mode is a cooling / heating operation mode with heating as the main mode, the processor controls the outdoor heat exchanger to be an evaporator.

[0060] When the target operation mode is the cooling and heating balance mode, the processor controls the outdoor heat exchanger to cut off the refrigerant.

[0061] Combine Figure 1 As shown in the figure, controlling the outdoor heat exchanger's status is primarily achieved by controlling a four-way valve. The four-way valve has four ports (CDES): port D connects to the compressor's discharge line, port S connects to the compressor's suction line, and port C connects to the outdoor heat exchanger. When the outdoor heat exchanger is shut off and no refrigerant is flowing, port C is disconnected from both ports D and S. When the outdoor heat exchanger is on, if the outdoor heat exchanger is operating as an evaporator, port C connects to port S; if the outdoor heat exchanger is operating as a condenser, port C connects to port D.

[0062] Optionally, the operating parameters of the air conditioner further include the operating frequency of the compressor; in step S103, the processor controls the operating parameters of the air conditioner according to the target operating mode, including:

[0063] When the target operation mode is a cooling-dominated heating and cooling operation mode, the processor adjusts the operating frequency of the compressor according to the total cooling demand.

[0064] When the target operation mode is a cooling / heating operation mode with heating as the main mode, the processor adjusts the operating frequency of the compressor according to the total heating demand.

[0065] In balanced cooling mode, the outdoor heat exchanger is shut off from refrigerant flow, and heating capacity = cooling capacity + compressor power consumption. Therefore, in balanced cooling mode, heating capacity slightly exceeds cooling capacity, and the compressor's operating frequency depends on heating capacity. In cooling-primarily controlled cooling mode, the outdoor heat exchanger acts as a condenser, and the cooling capacity is greater than in balanced cooling mode. This means that some of the indoor heat absorbed during cooling needs to be released through the outdoor unit. The amount of heat absorbed by the evaporator from the room exceeds the amount of cooling absorbed by the condenser, so the compressor's operating frequency depends on the total cooling demand. Similarly, in heating-primarily controlled cooling mode, the compressor's operating frequency depends on the total heating demand.

[0066] Combine Figure 3 As shown, the embodiment of the present disclosure provides another temperature control method for an air conditioner, comprising:

[0067] S101: When heating and cooling demands exist in multiple rooms, the processor calculates the total heating demand and the total cooling demand according to the ambient temperature and target temperature of each room.

[0068] S102: The processor determines a target operating mode of the air conditioner according to the total heating demand and the total cooling demand.

[0069] S131, when the target operation mode is a cooling-based heating and cooling operation mode, the processor adjusts the throttle valve opening of the indoor heat exchanger serving as the evaporator according to the cooling capacity corresponding to each refrigeration indoor unit and the indoor ambient temperature to adjust the refrigerant flow of the evaporator.

[0070] S132: The processor adjusts the throttle valve opening of the indoor heat exchanger serving as the condenser according to the heating amount of each heating indoor unit and the indoor ambient temperature to adjust the refrigerant flow of the condenser.

[0071] S133, the processor adjusts the opening of the outdoor throttle valve according to the difference between the sum of the refrigerant flow rates of the indoor evaporators and the sum of the refrigerant flow rates of the indoor condensers to adjust the refrigerant flow rate of the outdoor heat exchanger.

[0072] Here, combined Figure 4This section explains the refrigerant flow adjustment in the cooling and heating operation mode. Figure 4 As shown, in the cooling-dominated heating and cooling operation mode, the outdoor heat exchanger functions as a condenser. The first indoor unit generates heat, while the nth indoor unit generates cool air. The high-temperature, high-pressure refrigerant discharged from the compressor flows through the four-way valve, then through the three-way valve (where terminals C' and D' are connected), into the first indoor heat exchanger HE11 of the first indoor unit. After heat exchange, the refrigerant then flows through the outdoor throttle valve EV0 and the first throttle valve EV11, before flowing through the second throttle valve EVn2 of the nth indoor unit and into the second indoor heat exchanger HEn2. Finally, the refrigerant flows back to the low-pressure and intermediate-pressure cylinders of the compressor through the four-way valve, with the control valve V2 in the open position. (At this point, the three-way valve connected to the compressor suction line is blocked, meaning terminals S' and E' are connected. To allow some refrigerant to flow back to the low-pressure cylinder, the control valve is in the open position. Here, terminal E' of the four-way valve is blocked, allowing the four-way valve to function as a three-way valve.)

[0073] In the above process, in order to ensure the indoor cooling and heating capacity, the refrigerant flow rate needs to be controlled, which is specifically manifested in the control of the throttle valve. In the embodiment of the present disclosure, there is a cooling demand in only one room, and there is also a heating demand in only one room. Therefore, the total heating demand is the heating capacity of the first indoor unit, and the total cooling demand is the cooling capacity of the nth indoor unit. First, based on the total cooling demand (i.e., the cooling capacity in the nth room) and the current indoor ambient temperature of the nth indoor unit, the opening of the second throttle valve EVn2 is determined. Among them, the current indoor ambient temperature of the nth indoor unit determines the evaporation temperature, and the evaporation temperature and cooling capacity jointly determine the refrigerant flow rate, i.e., the opening of the second throttle valve EVn2. Then, based on the same principle, the opening of the first throttle valve EV11 of the first indoor unit for heating is determined. Finally, based on the difference between the refrigerant flow rate of the second heat exchanger of the nth indoor unit and the refrigerant flow rate of the first heat exchanger of the first indoor unit, the opening of the outdoor throttle valve is adjusted. Since cooling is the primary function here, the sum of the refrigerant flow rates of the cooling indoor units is greater than the sum of the refrigerant flow rates of the heating indoor units. Therefore, the throttle valve opening corresponding to the cooling indoor heat exchanger is determined first, followed by the throttle valve opening corresponding to the heating indoor heat exchanger, and finally the outdoor throttle valve opening.

[0074] In addition, for the evaporator, its refrigerant flow is basically proportional to the indoor ambient temperature and cooling capacity. For the condenser, its refrigerant flow is basically proportional to the indoor ambient temperature and heating capacity. The refrigerant flow of the heat exchanger is proportional to the opening size of the throttle valve. It should be noted that when there is cooling demand (or heating demand) in multiple rooms, the throttle valve opening corresponding to each indoor heat exchanger is adjusted according to the cooling demand (or heating demand) in each room. In the cooling and heating operation mode with cooling as the main method, the second indoor heat exchanger is the evaporator and the first indoor heat exchanger is the condenser.

[0075] Combine Figure 5 As shown, the embodiment of the present disclosure provides another temperature control method for an air conditioner, comprising:

[0076] S101: When heating and cooling demands exist in multiple rooms, the processor calculates the total heating demand and the total cooling demand according to the ambient temperature and target temperature of each room.

[0077] S102: The processor determines a target operating mode of the air conditioner according to the total heating demand and the total cooling demand.

[0078] S134, when the target operation mode is a heating-based cooling operation mode, the processor adjusts the throttle valve opening of the indoor heat exchanger serving as the condenser according to the heating amount corresponding to each heating indoor unit and the indoor ambient temperature to adjust the refrigerant flow of the condenser.

[0079] S135 , the processor adjusts the throttle valve opening of the indoor heat exchanger serving as the evaporator according to the cooling capacity corresponding to each refrigeration indoor unit and the indoor ambient temperature, so as to adjust the refrigerant flow of the evaporator.

[0080] S136, the processor adjusts the opening of the outdoor throttle valve according to the difference between the sum of the refrigerant flow rates of the indoor condensers and the sum of the refrigerant flow rates of the indoor evaporators to adjust the refrigerant flow rate of the outdoor heat exchanger.

[0081] Here, combined Figure 6 This section explains the refrigerant flow adjustment in the heating and cooling operation mode. Figure 6 As shown, in the heating-primary cooling and heating operation mode, the outdoor heat exchanger serves as a condenser. The first indoor unit operates in cooling mode, while the nth indoor unit operates in heating mode. The high-temperature, high-pressure refrigerant discharged from the compressor flows through a four-way valve into the second indoor heat exchanger of the nth indoor unit. After heat exchange, the refrigerant is throttled by the second throttle valve EVn2 before flowing through the outdoor throttle valve EV0 and the first throttle valve EV11 in the first indoor unit to the outdoor heat exchanger and the first heat exchanger HE11 in the first indoor unit, respectively. Finally, the refrigerant flows back to the low-pressure and intermediate-pressure cylinders of the compressor through the three-way valve (in this case, terminals C' and S' are connected, and terminals D' and E' are connected) and the four-way valve. At this point, the control valve can be either closed or open. When the control valve is open, the difference in refrigerant flow rates between the intermediate-pressure and low-pressure cylinders can be minimized to a certain extent.

[0082] In the above process, in order to ensure the indoor cooling and heating capacity, it is necessary to control the refrigerant flow rate, which is specifically manifested in the control of the throttle valve, and the control principle is basically the same as the cooling and heating operation mode mentioned above. The difference is that the embodiment of the present disclosure is mainly heating, that is, the sum of the refrigerant flow rates of the indoor units for heating is greater than the sum of the refrigerant flow rates of the indoor units for cooling. Therefore, the opening of the throttle valve corresponding to the indoor heat exchanger for heating is first determined, then the opening of the throttle valve corresponding to the indoor heat exchanger for cooling is determined, and finally the opening of the outdoor throttle valve is determined. In addition, in the cooling and heating operation mode mainly for heating, the second indoor heat exchanger is a condenser and the first indoor heat exchanger is an evaporator.

[0083] also, Figure 7 The flow direction of the refrigerant in the cold and hot balance mode is shown. Specifically, the second heat exchanger HEn2 in the nth room is a condenser, and the first heat exchanger HE11 in the 1st room is an evaporator. The high-temperature and high-pressure refrigerant of the compressor flows into the second heat exchanger HEn2 through the four-way valve, flows into the first heat exchanger HE11 after passing through the corresponding second throttle valve EVn2 and the first throttle valve EV11, and then flows into the low-pressure cylinder and the medium-pressure cylinder through the three-way valve and the control valve. Optionally, the second heat exchanger in one or some rooms serves as a condenser, and the first heat exchanger in another or other rooms serves as an evaporator. Here, because the S' end of the three-way valve is connected to the suction line of the low-pressure cylinder, the first indoor heat exchanger connected to the three-way valve is preferentially used as the evaporator.

[0084] Combine Figure 8 As shown, an embodiment of the present disclosure provides a temperature control device 70 for an air conditioner, comprising a processor 700 and a memory 701. Optionally, the device 70 may further include a communication interface 702 and a bus 703. The processor 700, the communication interface 702, and the memory 701 may communicate with each other via the bus 703. The communication interface 702 may be used for information transmission. The processor 700 may call the logic instructions in the memory 701 to execute the temperature control method for the air conditioner of the above embodiment.

[0085] In addition, the logic instructions in the memory 701 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0086] Memory 701, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 700 executes the program instructions / modules stored in memory 701 to perform functional applications and data processing, thereby implementing the temperature control method for an air conditioner in the above-described embodiments.

[0087] The memory 701 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 701 may include high-speed random access memory and non-volatile memory.

[0088] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned temperature control method for an air conditioner.

[0089] The technical solutions of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code.

[0090] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0091] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0092] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, and can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown 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 to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0093] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A temperature control method for air conditioning, characterized in that: The indoor unit includes multiple indoor units distributed in different rooms, and each indoor unit includes two indoor heat exchangers connected in parallel. The method includes: When there are heating and cooling demands in multiple rooms, the total heating demand and the total cooling demand are calculated based on the ambient temperature and target temperature of each room. Determine the target operating mode of the air conditioner based on the total heating demand and the total cooling demand; Control the operating parameters of the air conditioner according to the target operating mode; The target operation mode includes a cooling-based heating and cooling operation mode, a heating-based heating and cooling operation mode, or a cooling and heating balance mode; and the operation parameters of the air conditioner include the status of the outdoor unit heat exchanger.

2. The method according to claim 1, characterized in that Based on the total heating and cooling demands, determine the target operating mode of the air conditioner, including: Calculate the actual ratio of total heating demand to total cooling demand; When the actual ratio is greater than the reference value, the target operation mode of the air conditioner is determined to be a cooling and heating operation mode with heating as the main mode; When the actual ratio is less than the reference value, the target operation mode of the air conditioner is determined to be a cooling and heating operation mode with cooling as the main mode; When the actual ratio is equal to the reference value, determining the target operation mode of the air conditioner to be a cooling and heating balance mode; The reference value is determined based on the cold and hot balance model.

3. The method according to claim 2, characterized in that The reference value is determined by: In the heat and cold balance mode, the power consumption of the compressor, the total heating capacity and the total cooling capacity are determined so that the total heating capacity is equal to the sum of the total cooling capacity and the power consumption of the compressor; When the total heating capacity is equal to the sum of the total cooling capacity and the compressor power consumption, the ratio of the total heating capacity to the total cooling capacity is used as a reference value; Among them, the cold and hot balance mode is an operating mode in which the outdoor heat exchanger is not activated, and the indoor heat exchanger for cooling demand is used as the evaporator, and the indoor heat exchanger for heating demand is used as the condenser.

4. The method according to claim 1, wherein According to the target operating mode, control the operating parameters of the air conditioner, including: When the target operation mode is a cooling-dominated heating and cooling operation mode, the outdoor heat exchanger is controlled to be a condenser; When the target operation mode is a cooling and heating operation mode with heating as the main mode, the outdoor heat exchanger is controlled to be an evaporator; When the target operation mode is the cooling and heating balance mode, the outdoor heat exchanger is controlled to be cut off so that the refrigerant does not flow.

5. The method according to claim 4, characterized in that One end of each indoor heat exchanger is connected to a throttle valve. The operating parameters of the air conditioner also include the refrigerant flow rate of the indoor heat exchanger and the outdoor heat exchanger. When the target operating mode is a cooling-dominated heating and cooling operating mode, the operating parameters of the air conditioner are controlled according to the target operating mode, and further include: According to the cooling capacity of each refrigeration indoor unit and the indoor ambient temperature, the throttle valve opening of the indoor heat exchanger serving as the evaporator is adjusted to adjust the refrigerant flow of the evaporator; According to the heating capacity of each heating indoor unit and the indoor ambient temperature, the throttle valve of the indoor heat exchanger serving as the condenser is adjusted to adjust the refrigerant flow of the condenser; According to the difference between the sum of the refrigerant flow rates of the indoor evaporators and the sum of the refrigerant flow rates of the indoor condensers, the opening of the outdoor throttle valve is adjusted to adjust the refrigerant flow rate of the outdoor heat exchanger.

6. The method according to claim 4, characterized in that One end of each indoor heat exchanger is connected to a throttle valve, and the operating parameters of the air conditioner also include the refrigerant flow rate of the indoor heat exchanger and the outdoor heat exchanger; When the target operation mode is a cooling and heating operation mode with heating as the main mode, controlling the operation parameters of the air conditioner according to the target operation mode also includes: According to the heating capacity of each heating indoor unit and the indoor ambient temperature, the throttle valve opening of the indoor heat exchanger serving as the condenser is adjusted to adjust the refrigerant flow of the condenser; According to the cooling capacity of each refrigeration indoor unit and the indoor ambient temperature, the throttle valve opening of the indoor heat exchanger serving as the evaporator is adjusted to adjust the refrigerant flow of the evaporator; According to the difference between the sum of the refrigerant flow rates of the indoor condensers and the sum of the refrigerant flow rates of the indoor evaporators, the opening of the outdoor throttle valve is adjusted to adjust the refrigerant flow rate of the outdoor heat exchanger.

7. The method according to any one of claims 1 to 6, characterized in that The operating parameters of the air conditioner also include the operating frequency of the compressor. According to the target operating mode, the operating parameters of the air conditioner are controlled, including: When the target operation mode is a cooling-based heating and cooling operation mode, the operating frequency of the compressor is adjusted according to the total cooling demand; When the target operation mode is a cooling / heating operation mode with heating as the main mode, the operating frequency of the compressor is adjusted according to the total heating demand.

8. A temperature control device for an air conditioner, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the temperature control method for an air conditioner according to any one of claims 1 to 7 when running the program instructions.

9. An air conditioning system, characterized in that: include: Compressor, including intermediate pressure cylinder and low pressure cylinder; A four-way valve connected to the exhaust line of the compressor and to the suction line of the intermediate pressure cylinder; A three-way valve connected to the exhaust line of the compressor and to the suction line of the low-pressure cylinder; The outdoor heat exchanger is connected to the exhaust pipe of the compressor through a four-way valve; Multiple indoor units, each including a first indoor heat exchanger and a second indoor heat exchanger connected in parallel; one end of the first indoor heat exchanger is connected to the exhaust pipe of the compressor or the suction pipe of the low-pressure cylinder through a three-way valve, and one end of the second indoor heat exchanger is connected to the exhaust pipe of the compressor or the suction pipe of the intermediate-pressure cylinder through a four-way valve; the other ends of the first indoor heat exchanger and the second indoor heat exchanger are connected to the outdoor heat exchanger through a first throttle valve and a second throttle valve, respectively; The outdoor throttle valve is installed on the pipeline between the indoor unit and the outdoor heat exchanger; The temperature control device for an air conditioner as claimed in claim 8 is electrically connected to the outdoor throttle valve, the first throttle valve, the second throttle valve, the compressor, the four-way valve and the three-way valve.

10. A computer-readable storage medium storing program instructions, characterized in that: When the program instructions are executed, the computer is configured to execute the temperature control method for an air conditioner according to any one of claims 1 to 7.

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