Method and device for controlling central air conditioner and central air conditioner

Abstract

The invention relates to the technical field of central air conditioners, and discloses a method for controlling a central air conditioner, which comprises the following steps: acquiring an air supply speed, a refrigerant water supply temperature, a refrigerant water return temperature and an air return temperature; determining a heat exchange coefficient according to the air supply speed; according to the heat exchange coefficient, the refrigerant water supply temperature, the refrigerant water return temperature and the air return temperature, the air supply temperature of the coil pipe is determined; and the electric control valve is controlled according to the air supply temperature of the coil pipe. According to the scheme, parameters such as the air supply speed, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature are monitored in real time, and the air supply temperature of the coil pipe is accurately determined through the parameters. Therefore, the electric control valve can be accurately controlled according to the air supply temperature of the coil pipe, and the situation of energy waste in the reheating or return air mixing process is effectively avoided. And the operation cost of the central air conditioning system is reduced while the air supply comfort of the central air conditioner is improved. The invention further discloses a device for controlling the central air conditioner and the central air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of central air conditioning, for example, to a method and device for controlling a central air conditioning and a central air conditioning. Background Art

[0002] As an indispensable part of modern buildings, the performance and efficiency of central air-conditioning systems directly affect the comfort of the indoor environment and the overall energy consumption of the building. In the design of air-conditioning systems, the control of supply air temperature is a key link to ensure the comfort of the indoor environment. At present, reheating technology is widely used in the market to control the supply air temperature of central air conditioners. Specifically, reheating technology can add an electric heater at the end of the air supply duct to reheat the air that has been initially cooled, so that it reaches the preset supply air temperature before being sent into the room. It can be seen that although reheating technology can ensure the accuracy of the supply air temperature, the process of "first cold and then hot" undoubtedly increases energy consumption, especially when the temperature difference is large, the waste of electricity is particularly significant.

[0003] At present, central air conditioners can use mixed air technology to solve the technical problem of high power consumption of reheating technology. Specifically, mixed air technology is to introduce part of the indoor return air and mix it with the supply air, and adjust the supply air temperature by the temperature of the return air, so as to achieve energy saving effect.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] Although the mixed air technology reduces the energy consumption generated by the reheating process, it increases the burden on the refrigeration system and causes a certain amount of energy waste.

[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 the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the 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 components 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 method, a device and an air conditioner for controlling a central air conditioner, which can provide a more energy-saving central air conditioner control solution to improve the air supply comfort of the central air conditioner.

[0009] In some embodiments, the method for controlling a central air conditioner includes: obtaining the supply air speed, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature; determining the heat transfer coefficient according to the supply air speed; determining the supply air temperature of the coil according to the heat transfer coefficient, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature; and controlling the electric regulating valve according to the supply air temperature of the coil.

[0010] In some embodiments, the method for controlling a central air conditioner includes: determining the Nusselt number based on the air supply speed; and calculating the heat transfer coefficient based on the Nusselt number, the thermal conductivity of the air, and the diameter of the coil.

[0011] In some embodiments, the method for controlling a central air conditioner includes: calculating the Reynolds number based on the air supply velocity, the air kinematic viscosity, and the coil diameter; and determining the Nusselt number based on the Reynolds number and the Prandtl number.

[0012] In some embodiments, the method for controlling central air conditioning includes: calculating the average value of the refrigerant supply water temperature and the refrigerant return water temperature; determining the heat exchange amount based on the heat exchange coefficient, the external surface area of ​​the coil, the average value of the refrigerant supply water temperature and the refrigerant return water temperature, and the return air temperature; determining the supply air temperature of the coil based on the heat exchange amount and the return air temperature.

[0013] In some embodiments, the method for controlling a central air conditioner includes:

[0014]

[0015] Among them, t s is the supply air temperature of the coil, t f is the return air temperature, Q f is the indoor heat gain, and the indoor heat gain Q f Equal to the heat transfer Q, C p is the specific heat of air, ρ is the air density, V is the air supply velocity, and A is the cross-sectional area of ​​the duct.

[0016] In some embodiments, the method for controlling central air conditioning includes: determining a target temperature threshold based on the return air temperature; determining a target control strategy for the electric regulating valve based on the supply air temperature of the coil and the target temperature threshold; and controlling the electric regulating valve according to the target control strategy.

[0017] In some embodiments, the method for controlling a central air conditioner includes: when the supply air temperature of the coil is greater than a target temperature threshold, determining that a target control strategy for the electric regulating valve is to increase the valve opening of the electric regulating valve according to a target amplitude; when the supply air temperature of the coil is less than the target temperature threshold, determining that a target control strategy for the electric regulating valve is to reduce the valve opening of the electric regulating valve according to a target amplitude.

[0018] In some embodiments, the device for controlling central air conditioning includes: an acquisition module, configured to acquire the supply air speed, refrigerant water supply temperature, refrigerant return water temperature and return air temperature; a first determination module, configured to determine the heat transfer coefficient according to the supply air speed; a second determination module, configured to determine the supply air temperature of the coil according to the heat transfer coefficient, refrigerant water supply temperature, refrigerant return water temperature and return air temperature; a control module, configured to control the electric regulating valve according to the supply air temperature of the coil.

[0019] In some embodiments, the device for controlling a central air conditioner includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned method for controlling a central air conditioner when running the program instructions.

[0020] In some embodiments, the central air conditioner includes: a central air conditioner body; and the aforementioned device for controlling the central air conditioner, which is installed on the central air conditioner body.

[0021] The method, device and central air conditioner for controlling the central air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects: by real-time monitoring of parameters such as the air supply velocity, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature, and using these parameters to accurately determine the air supply temperature of the coil. In order to accurately control the electric regulating valve according to the air supply temperature of the coil, to ensure that the central air conditioner outputs air at a constant temperature, and effectively avoid energy waste caused by reheating or return air mixing. While improving the comfort of the central air conditioner's air supply, it also reduces the operating cost of the central air conditioning system.

[0022] 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

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1-1 is a structural schematic diagram of a central air conditioner provided by an embodiment of the present disclosure;

[0025] Figure 1-2 is a schematic diagram of a method for controlling a central air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 2 is a schematic diagram of a method for determining a heat transfer coefficient provided by an embodiment of the present disclosure;

[0027] Figure 3 is a schematic diagram of a method for determining the supply air temperature of a coil provided by an embodiment of the present disclosure;

[0028] Figure 4 is a schematic diagram of a method for controlling an electric regulating valve provided by an embodiment of the present disclosure;

[0029] Figure 5 is a schematic diagram of a device for controlling a central air conditioner provided in an embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of a device for controlling a central air conditioner provided in an embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 1: Motor; 2: Fan; 3: Return air temperature sensor; 4: Coil; 5: MEMS (Micro Electro Mechanical Systems) gas flow sensor; 6: Inlet temperature sensor; 7: Outlet temperature sensor; 8: Electric regulating valve; 9: Control center. DETAILED DESCRIPTION

[0033] In order to be able to understand the features and technical contents 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 attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the 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.

[0034] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0035] Unless otherwise stated, the term "plurality" means two or more.

[0036] 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 indicates: A or B.

[0037] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0038] 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.

[0039] In the embodiments of the present disclosure, smart home appliances refer to home appliances that are formed by introducing microprocessors, sensor technology, and network communication technology into home appliances. They have the characteristics of intelligent control, intelligent perception, and intelligent application. The operation process of smart home appliances often relies on the application and processing of modern technologies such as the Internet of Things, the Internet, and electronic chips. For example, smart home appliances can be connected to electronic devices to enable users to remotely control and manage the smart home appliances.

[0040] In the embodiments of the present disclosure, the terminal device refers to an electronic device with a wireless connection function. The terminal device can communicate with the above-mentioned smart home appliances by connecting to the Internet, or can directly communicate with the above-mentioned smart home appliances through Bluetooth, Wi-Fi, etc. In some embodiments, the terminal device is, for example, a mobile device, a computer, or a vehicle-mounted device built into a hover car, or any combination thereof. Mobile devices may include, for example, mobile phones, smart home devices, wearable devices, smart mobile devices, virtual reality devices, etc., or any combination thereof, wherein wearable devices include, for example: smart watches, smart bracelets, pedometers, etc.

[0041] Figure 1-11 is a schematic diagram of the structure of a central air conditioner provided by an embodiment of the present disclosure; in combination with FIG1 , an embodiment of the present disclosure provides a central air conditioner. The central air conditioner includes: a motor 1, a fan 2, a return air temperature sensor 3, a coil 4, a MEMS flow sensor 5, an inlet temperature sensor 6, an outlet temperature sensor 7, an electric regulating valve 8 and a control center 9. Specifically, when the required load in the room changes, the central air conditioner can adjust the speed of the fan 2 by controlling the motor 1. The central air conditioner can collect the return air temperature of the central air conditioner through the return air temperature sensor 3. With this solution, the return air temperature can be accurately obtained. The central air conditioner can collect the supply air speed of the central air conditioner through the MEMS flow sensor 5. With this solution, the supply air speed can be accurately obtained. In this embodiment, an inlet temperature sensor 6 is provided on the refrigerant inflow side of the coil 4, and an outlet temperature sensor 7 is provided on the refrigerant outflow side of the coil 4. In this way, the central air conditioner can obtain the refrigerant water supply temperature through the inlet temperature sensor 6. With this solution, the refrigerant water supply temperature can be accurately obtained. The central air conditioner can obtain the refrigerant return water temperature through the outlet temperature sensor 7. With this solution, the refrigerant return water temperature can be accurately obtained. In addition, an electric regulating valve 8 is provided on the refrigerant inlet side of the coil 4. In this way, the refrigerant flow rate flowing into the coil 4 can be adjusted by adjusting the opening of the electric regulating valve 8. The central air conditioner also includes a control center 9, which can adjust the components of the central air conditioner according to the control instructions to achieve accurate control of the central air conditioner.

[0042] Figure 1-2 is a schematic diagram of a method for controlling a central air conditioner provided by an embodiment of the present disclosure; Figure 1-2 As shown, the embodiment of the present disclosure provides a method for controlling a central air conditioner, comprising:

[0043] S11, the central air conditioner obtains the supply air speed, the refrigerant supply water temperature, the refrigerant return water temperature and the return air temperature.

[0044] S12, the central air conditioner determines the heat exchange coefficient according to the air supply speed.

[0045] S13, the central air conditioner determines the supply air temperature of the coil according to the heat exchange coefficient, the refrigerant supply water temperature, the refrigerant return water temperature and the return air temperature.

[0046] S14, the central air conditioner controls the electric regulating valve according to the air supply temperature of the coil.

[0047] In this solution, the central air conditioner can collect the air supply speed of the central air conditioner through the MEMS flow sensor. The central air conditioner can obtain the refrigerant water supply temperature through the inlet temperature sensor. The central air conditioner can obtain the refrigerant return water temperature through the outlet temperature sensor. The central air conditioner can collect the return air temperature of the central air conditioner through the return air temperature sensor. With this solution, the supply air speed, refrigerant water supply temperature, refrigerant return water temperature and return air temperature can be accurately obtained in turn.

[0048] Furthermore, the central air conditioner can determine the heat transfer coefficient in combination with the air supply wind speed. Specifically, the central air conditioner determines the heat transfer coefficient according to the air supply wind speed, including: the central air conditioner determines the Nusselt number according to the air supply wind speed. The central air conditioner calculates the heat transfer coefficient based on the Nusselt number, the air thermal conductivity and the coil diameter. With this solution, the Nusselt number corresponding to the air supply wind speed can be calculated using the principles of fluid mechanics and heat transfer. Combined with known physical parameters such as air thermal conductivity and coil diameter, a complex mathematical model is used to accurately calculate the current heat transfer coefficient, providing an accurate data basis for determining the supply air temperature of the coil.

[0049] Further, the central air conditioner determines the supply air temperature of the coil according to the heat exchange coefficient, the refrigerant water supply temperature, the refrigerant water return temperature and the return air temperature, including: the central air conditioner calculates the average value of the refrigerant water supply temperature and the refrigerant water return temperature. The central air conditioner determines the heat exchange amount according to the heat exchange coefficient, the outer surface area of ​​the coil, the average value of the refrigerant water supply temperature and the refrigerant water return temperature, and the return air temperature. The central air conditioner determines the supply air temperature of the coil according to the heat exchange amount and the return air temperature. With this scheme, the supply air temperature of the coil can be accurately determined, providing an accurate data basis for the control of the electric regulating valve. Further, the central air conditioner controls the electric regulating valve according to the supply air temperature of the coil.

[0050] The method for controlling the central air conditioner provided by the embodiment of the present disclosure monitors the air supply velocity, the refrigerant water supply temperature, the refrigerant return water temperature, the return air temperature and other parameters in real time, and uses these parameters to accurately determine the air supply temperature of the coil. The electric regulating valve can be accurately controlled according to the air supply temperature of the coil to ensure that the central air conditioner outputs air at a constant temperature, effectively avoiding energy waste caused by reheating or return air mixing. The air supply comfort of the central air conditioner is improved while reducing the operating cost of the central air conditioner system.

[0051] Figure 2 is a schematic diagram of a method for determining a heat transfer coefficient provided by an embodiment of the present disclosure; Figure 2 As shown, optionally, in S12, the central air conditioner determines the heat exchange coefficient according to the air supply speed, including:

[0052] S21, the central air conditioner determines the Nusselt number based on the air supply speed.

[0053] S22, central air conditioning calculates the heat transfer coefficient based on the Nusselt number, air thermal conductivity and coil diameter.

[0054] In this scheme, the central air conditioner determines the Nusselt number according to the air supply wind speed, including: the central air conditioner calculates the Reynolds number according to the air supply wind speed, the kinematic viscosity of the air and the diameter of the coil. The central air conditioner determines the Nusselt number according to the Reynolds number and the Prandtl number. With this scheme, the Reynolds number is accurately calculated by comprehensively considering the air supply wind speed of the central air conditioner, the kinematic viscosity of the air and the diameter of the coil, so that the characteristics of the fluid flow can be accurately reflected by the Reynolds number. In addition, the Nusselt number is further determined using the Reynolds number and the known Prandtl number. With this scheme, the Nusselt number can be accurately determined to provide an accurate data basis for the evaluation of the convective heat transfer intensity. In this way, the algorithm effectively ensures that the central air conditioner can achieve efficient heat exchange under different working conditions, which is convenient for improving the operating efficiency and heat exchange performance of the central air conditioner.

[0055] Furthermore, the central air conditioner can calculate the heat transfer coefficient based on the Nusselt number, the air thermal conductivity and the coil diameter. Specifically, the central air conditioner calculates the heat transfer coefficient based on the Nusselt number, the air thermal conductivity and the coil diameter, including:

[0056]

[0057] Among them, h is the heat transfer coefficient, Nu is the Nusselt number, λ is the air thermal conductivity, and d is the coil diameter. This solution can combine the known physical parameters such as air thermal conductivity and coil diameter, and accurately calculate the current heat transfer coefficient through a complex mathematical model, providing an accurate data basis for determining the supply air temperature of the coil.

[0058] Optionally, in S21, the central air conditioner determines the Nusselt number according to the air supply speed, including:

[0059] Central air conditioning calculates the Reynolds number based on the air supply velocity, air kinematic viscosity and coil diameter.

[0060] Central air conditioning determines the Nusselt number based on the Reynolds number and Prandtl number.

[0061] In this solution, the central air conditioner can calculate the Reynolds number based on the air supply velocity, air kinematic viscosity and coil diameter. Specifically, the central air conditioner calculates the Reynolds number based on the air supply velocity, air kinematic viscosity and coil diameter, including:

[0062]

[0063] Among them, R eis the Reynolds number, V is the air supply velocity, d is the coil diameter, and v is the air kinematic viscosity. In this scheme, the Reynolds number is accurately calculated by comprehensively considering the air supply velocity of the central air conditioner, the kinematic viscosity of the air, and the coil diameter, so that the Reynolds number can accurately reflect the characteristics of fluid flow.

[0064] Furthermore, the central air conditioner can determine the Nusselt number by combining the Reynolds number and the Prandtl number. The Prandtl number includes the first Prandtl number P determined by looking up the average value of the supply and return water temperatures. rf , and the second Prandtl number P determined by looking up the coil wall temperature table rw Here, the average supply and return water temperature is the average of the refrigerant supply water temperature and the refrigerant return water temperature. In this way, the central air conditioner determines the Nusselt number based on the Reynolds number and the Prandtl number, including:

[0065]

[0066] Among them, N u is the Nusselt number, R e is the Reynolds number, n is the first coefficient, m is the second coefficient, P rf is the first Prandtl number, P rw is the second Prandtl number. As an example, n can be 0.84, m can be 0.36, and C can be 0.021. With this scheme, the Nusselt number can be accurately determined to provide an accurate data basis for the evaluation of convective heat transfer intensity. In this way, the algorithm effectively ensures that the central air conditioner can achieve efficient heat exchange under different working conditions, which is convenient for improving the operating efficiency and heat exchange performance of the central air conditioner.

[0067] Figure 3 is a schematic diagram of a method for determining the supply air temperature of a coil provided by an embodiment of the present disclosure; Figure 3 As shown, optionally, in S13, the central air conditioner determines the supply air temperature of the coil according to the heat exchange coefficient, the refrigerant water supply temperature, the refrigerant water return temperature and the return air temperature, including:

[0068] S31, the central air conditioner calculates the average value of the refrigerant water supply temperature and the refrigerant water return temperature.

[0069] S32, the central air conditioner determines the heat exchange amount according to the heat exchange coefficient, the outer surface area of ​​the coil, the average value of the refrigerant water supply temperature and the refrigerant water return temperature, and the return air temperature.

[0070] S33, the central air conditioner determines the supply air temperature of the coil according to the heat exchange amount and the return air temperature.

[0071] In this solution, the central air conditioner can calculate the average of the refrigerant water supply temperature and the refrigerant water return temperature after obtaining the refrigerant water supply temperature and the refrigerant water return temperature. The heat exchange amount is determined by combining the heat exchange coefficient, the outer surface area of ​​the coil, the average of the refrigerant water supply temperature and the refrigerant water return temperature, and the return air temperature. Specifically, the central air conditioner determines the heat exchange amount according to the heat exchange coefficient, the outer surface area of ​​the coil, the average of the refrigerant water supply temperature and the refrigerant water return temperature, and the return air temperature, including:

[0072] Q=h×F×(t w -t f )

[0073] Among them, Q is the heat transfer, h is the heat transfer coefficient, F is the outer surface area of ​​the coil, t w is the average value of the refrigerant supply water temperature and the refrigerant return water temperature, t f is the return air temperature. This solution accurately evaluates the heat transfer capacity of the central air conditioning system by precisely calculating the average value of the refrigerant supply and return water temperatures in the central air conditioning system, combining the heat transfer coefficient, the outer surface area of ​​the coil, and the current return air temperature. This calculation process ensures that the central air conditioning system can accurately sense and respond to changes in ambient temperature, thereby optimizing regulation.

[0074] Furthermore, the central air conditioner can determine the supply air temperature of the coil based on the heat exchange amount and the return air temperature. With this solution, the central air conditioner can quickly respond to changes in the indoor environment through a dynamic adjustment mechanism, providing users with a just right comfort experience.

[0075] Optionally, in S33, the central air conditioner determines the supply air temperature of the coil according to the heat exchange amount and the return air temperature, including:

[0076]

[0077] Among them, t s is the supply air temperature of the coil, t f is the return air temperature, Q f is the indoor heat gain, and the indoor heat gain Q f Equal to the heat transfer Q, C p is the specific heat capacity of air, ρ is the air density, V is the air supply velocity, and A is the cross-sectional area of ​​the air duct. With this scheme, the return air temperature, indoor heat gain, specific heat capacity of air, air density, air supply velocity, and air duct cross-sectional area can be input into the constructed heat exchange mathematical model to obtain the supply air temperature t of the coil output in the heat exchange mathematical model. s When the central air-conditioning is controlled according to the supply air temperature, it can not only effectively reduce the indoor temperature to a comfortable range, but also improve the operating efficiency and energy saving of the central air-conditioning.

[0078] Figure 4is a schematic diagram of a method for controlling an electric regulating valve provided by an embodiment of the present disclosure; Figure 4 As shown, optionally, in S14, the central air conditioner controls the electric regulating valve according to the air supply temperature of the coil, including:

[0079] S41, the central air conditioner determines a target temperature threshold according to the return air temperature.

[0080] S42, the central air conditioner determines a target control strategy for the electric regulating valve according to the air supply temperature of the coil and the target temperature threshold.

[0081] S43, the central air conditioner controls the electric regulating valve according to the target control strategy.

[0082] In this solution, the central air conditioner can predetermine the temperature amplitude value. Here, the temperature amplitude value can be pre-set by the user based on actual conditions, and the temperature amplitude value ranges from 3°C to 8°C. In this embodiment, the target temperature threshold value = return air temperature - temperature amplitude value. With this solution, the target temperature threshold value can be accurately determined.

[0083] Furthermore, the central air conditioner can determine the target control strategy of the electric regulating valve in combination with the supply air temperature of the coil and the target temperature threshold. Specifically, the central air conditioner determines the target control strategy of the electric regulating valve according to the supply air temperature of the coil and the target temperature threshold, including: when the supply air temperature of the coil is greater than the target temperature threshold, the central air conditioner determines the target control strategy of the electric regulating valve to increase the valve opening of the electric regulating valve according to the target amplitude. When the supply air temperature of the coil is less than the target temperature threshold, the central air conditioner determines the target control strategy of the electric regulating valve to reduce the valve opening of the electric regulating valve according to the target amplitude. Further, the central air conditioner can control the electric regulating valve according to the target control strategy. With this scheme, the electric regulating valve can be dynamically adjusted according to the real-time supply air temperature and the target temperature threshold, ensuring that the central air conditioner can respond quickly and effectively maintain the constant indoor temperature, providing users with a more comfortable and stable indoor environment.

[0084] Optionally, in S42, the central air conditioner determines a target control strategy of the electric regulating valve according to the air supply temperature of the coil and the target temperature threshold, including:

[0085] When the supply air temperature of the coil is greater than the target temperature threshold, the central air conditioner determines that the target control strategy of the electric regulating valve is to increase the valve opening of the electric regulating valve according to the target amplitude.

[0086] When the supply air temperature of the coil is lower than the target temperature threshold, the central air conditioner determines that the target control strategy of the electric regulating valve is to increase the valve opening of the electric regulating valve according to the target amplitude.

[0087] In this scheme, the target amplitude can be set to 5 steps. In this way, when the supply air temperature of the coil is greater than the target temperature threshold, the central air conditioner determines the target control strategy of the electric regulating valve to increase the valve opening of the electric regulating valve by five steps. When the supply air temperature of the coil is less than the target temperature threshold, the central air conditioner determines the target control strategy of the electric regulating valve to reduce the valve opening of the electric regulating valve by five steps. With this scheme, when the supply air temperature of the coil is higher than the target temperature threshold, the central air conditioner will automatically adjust the control strategy of the electric regulating valve, increase the flow of the cooling medium by increasing the valve opening, thereby effectively reducing the supply air temperature, gradually approaching and stabilizing it within the target temperature range. On the contrary, when the supply air temperature is lower than the target temperature threshold, the system will reduce the valve opening of the electric regulating valve and reduce the flow of the cooling medium to increase the supply air temperature, thereby also achieving a constant temperature effect.

[0088] Figure 5 is a schematic diagram of a device for controlling a central air conditioner provided by an embodiment of the present disclosure; Figure 5 As shown, the embodiment of the present disclosure provides a device 200 for controlling a central air conditioner, comprising an acquisition module 51, a first determination module 52, a second determination module 53 and a control module 54. The acquisition module 51 is configured to acquire the supply air velocity, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature; the first determination module 52 is configured to determine the heat transfer coefficient according to the supply air velocity; the second determination module 53 is configured to determine the supply air temperature of the coil according to the heat transfer coefficient, the refrigerant water supply temperature, the refrigerant return water temperature and the return air temperature; the control module 54 is configured to control the electric regulating valve according to the supply air temperature of the coil.

[0089] The device 200 for controlling a central air conditioner provided by the embodiment of the present disclosure monitors the air supply velocity, the refrigerant water supply temperature, the refrigerant return water temperature, the return air temperature and other parameters in real time, and uses these parameters to accurately determine the air supply temperature of the coil. The electric regulating valve can be accurately controlled according to the air supply temperature of the coil to ensure that the central air conditioner outputs air at a constant temperature, effectively avoiding energy waste caused by reheating or return air mixing. This improves the comfort of the central air conditioner's air supply and reduces the operating cost of the central air conditioning system.

[0090] Figure 6 is a schematic diagram of a device for controlling a central air conditioner provided by an embodiment of the present disclosure; Figure 6As shown, the embodiment of the present disclosure provides a device 300 for controlling a central air conditioner, including a processor 301 and a memory 302. Optionally, the device 300 may also include a communication interface 303 and a bus 304. The processor 301, the communication interface 303, and the memory 302 may communicate with each other through the bus 304. The communication interface 303 may be used for information transmission. The processor 301 may call the logic instructions in the memory 302 to execute the method for controlling a central air conditioner of the above embodiment.

[0091] In addition, the logic instructions in the memory 302 described above 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.

[0092] The memory 302 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 301 executes functional applications and data processing by running the program instructions / modules stored in the memory 302, that is, implementing the method for controlling the central air conditioner in the above embodiment.

[0093] The memory 302 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 302 may include a high-speed random access memory and may also include a non-volatile memory.

[0094] The embodiment of the present disclosure provides a central air conditioner, including: a central air conditioner body, and the above-mentioned device 200 (300) for controlling the central air conditioner. The device 200 (300) for controlling the central air conditioner is installed in the central air conditioner body. The installation relationship described here is not limited to placement inside the central air conditioner body, but also includes installation connections with other components of the central air conditioner, including but not limited to physical connections, electrical connections or signal transmission connections. It can be understood by those skilled in the art that the device 200 (300) for controlling the central air conditioner can be adapted to a feasible central air conditioner body, thereby realizing other feasible embodiments.

[0095] 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 method for controlling a central air conditioner.

[0096] The technical solution of the embodiment of the present disclosure can 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 embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes.

[0097] 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 changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the 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 the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "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 thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer 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 refer to the description of the method part.

[0098] 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 for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0099] 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 only schematic. For example, the division of the units can be only a logical function division. 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. 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, 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 implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0100] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order 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, and 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 functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a central air conditioner, characterized in that: include: Obtain supply air velocity, refrigerant supply water temperature, refrigerant return water temperature, and return air temperature; Determine the heat transfer coefficient based on the air supply speed; Determine the supply air temperature of the coil based on the heat transfer coefficient, refrigerant supply water temperature, refrigerant return water temperature and return air temperature; The electric regulating valve is controlled according to the supply air temperature of the coil.

2. The method according to claim 1, characterized in that According to the air supply speed, the heat transfer coefficient is determined, including: According to the air supply speed, determine the Nusselt number; The heat transfer coefficient is calculated based on the Nusselt number, air thermal conductivity and coil diameter.

3. The method according to claim 2, characterized in that Based on the supply air speed, determine the Nusselt number, including: Calculate the Reynolds number based on the air supply velocity, air kinematic viscosity and coil diameter; The Nusselt number is determined based on the Reynolds number and Prandtl number.

4. The method according to claim 1, characterized in that: Determine the supply air temperature of the coil based on the heat transfer coefficient, refrigerant supply water temperature, refrigerant return water temperature and return air temperature, including: Calculate the average value of the refrigerant supply water temperature and the refrigerant return water temperature; Determine the heat transfer capacity based on the heat transfer coefficient, the outer surface area of ​​the coil, the average of the refrigerant supply water temperature and the refrigerant return water temperature, and the return air temperature; Determine the supply air temperature of the coil based on the heat exchange amount and return air temperature.

5. The method according to claim 4, characterized in that Determine the supply air temperature of the coil based on the heat exchange amount and return air temperature, including: Among them, t s is the supply air temperature of the coil, t f is the return air temperature, Q f is the indoor heat gain, and the indoor heat gain Q f Equal to the heat transfer Q, C p is the specific heat of air, ρ is the air density, V is the air supply velocity, and A is the cross-sectional area of ​​the duct.

6. The method according to claim 1, characterized in that The electric regulating valve is controlled according to the supply air temperature of the coil, including: According to the return air temperature, determine the target temperature threshold; Determine the target control strategy of the electric regulating valve according to the supply air temperature of the coil and the target temperature threshold; The electric control valve is controlled according to the target control strategy.

7. The method according to claim 6, characterized in that According to the supply air temperature of the coil and the target temperature threshold, the target control strategy of the electric regulating valve is determined, including: When the air supply temperature of the coil is greater than the target temperature threshold, determining the target control strategy of the electric regulating valve to increase the valve opening of the electric regulating valve according to the target amplitude; When the supply air temperature of the coil is lower than the target temperature threshold, the target control strategy of the electric regulating valve is determined to reduce the valve opening of the electric regulating valve according to the target amplitude.

8. A device for controlling a central air conditioner, characterized in that: include: An acquisition module is configured to acquire supply air velocity, refrigerant supply water temperature, refrigerant return water temperature, and return air temperature; A first determination module is configured to determine a heat transfer coefficient according to a supply air speed; A second determination module is configured to determine the supply air temperature of the coil according to the heat exchange coefficient, the refrigerant supply water temperature, the refrigerant return water temperature and the return air temperature; The control module is configured to control the electric regulating valve according to the supply air temperature of the coil.

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

10. A central air conditioner, characterized in that: include: Central air conditioning body; The device for controlling a central air conditioner as described in claim 8 or 9 is installed on the central air conditioner body.

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