Control method of secondary air return constant-temperature and constant-humidity air conditioning unit and related equipment

Abstract

The embodiment of the invention provides a control method of a secondary air return constant-temperature and constant-humidity air conditioning unit and related equipment. The method comprises the steps that the current indoor temperature corresponding to a target air conditioning unit is obtained; and the opening degree of a first venturi valve and the opening degree of a second venturi valve are adjusted on the basis of the current indoor temperature and a preset indoor temperature value, so that the total air return amount flowing through the first venturi valve and the second venturi valve is within a preset range. The venturi valve is arranged so that the primary return air volume and the secondary return air volume can be accurately controlled, then accurate reheat can be provided through secondary return air, a heater does not need to be arranged, and therefore the secondary return air adjusting system can be applied to the constant-temperature and constant-humidity air conditioning unit, the problem that cold and hot are abutted in the primary return air adjusting system is solved, and the service life of the air conditioning unit is prolonged. Therefore, the characteristics of the secondary return air adjusting system can be fully utilized to save the energy consumption of the constant-temperature and constant-humidity air conditioning unit and reduce the area of the evaporator.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent air-conditioning control, and in particular to a control method and related equipment for a secondary return air constant temperature and humidity air-conditioning unit. Background Art

[0002] Constant temperature and humidity air-conditioning units are widely used in some areas with strict requirements on indoor temperature and humidity fluctuations, such as laboratories, testing rooms, operating rooms and other special environments. However, the energy consumption of constant temperature and humidity air-conditioning units is relatively high. The existing constant temperature and humidity air-conditioning units cool the mixed air to a sufficiently low dew point temperature after the primary return air, and then use secondary heating means to achieve the required precision control. However, this approach has the problem of cold and heat offsetting each other, resulting in energy waste. In the adjustment of the secondary return air system, the primary return air volume and the secondary return air volume interfere with each other in the actual process, making it difficult to accurately control the primary return air volume and the secondary return air volume, and it is impossible to accurately control the supply air temperature by controlling the primary return air volume and the secondary return air volume. Therefore, the secondary return air system is difficult to apply to constant temperature and humidity air-conditioning units. Summary of the invention

[0003] The embodiment of the present application provides a control method and related equipment for a secondary return air constant temperature and humidity air conditioning unit, which can solve the problem of accurate control of the primary return air volume and the secondary return air volume of the secondary return air constant temperature and humidity air conditioning unit.

[0004] A first aspect of an embodiment of the present application provides a control method for a secondary return air constant temperature and humidity air conditioning unit, the method comprising:

[0005] Get the current indoor temperature corresponding to the target air-conditioning unit;

[0006] The openings of the first Venturi valve and the second Venturi valve are adjusted based on the current indoor temperature and the preset indoor temperature value so that the total return air volume flowing through the first Venturi valve and the second Venturi valve is within a preset range.

[0007] Optionally, adjusting the opening of the first Venturi valve and the second Venturi valve based on the current indoor temperature and a preset indoor temperature value includes:

[0008] When the current indoor temperature is lower than the preset indoor temperature value, the second Venturi valve is controlled to open wider and the first Venturi valve is controlled to open narrower; and / or,

[0009] When the current indoor temperature is greater than the preset indoor temperature value, the opening of the second Venturi valve is controlled to become smaller, and the opening of the first Venturi valve is controlled to become larger, wherein the first Venturi valve is a control valve corresponding to controlling the primary return air volume, and the second Venturi valve is a control valve corresponding to controlling the secondary return air volume.

[0010] Optionally, also include:

[0011] Get the air outlet temperature;

[0012] Determining a second air supply volume based on a difference between a preset air supply temperature value and the air supply outlet temperature;

[0013] controlling the opening of the second venturi valve according to the second air supply volume;

[0014] Determine a first air supply volume according to the second air supply volume and the total return air volume;

[0015] The opening degree of the first Venturi valve is controlled by the first air supply volume.

[0016] Optionally, also include:

[0017] When the opening of the second venturi valve reaches a preset opening and the air outlet temperature is less than the preset air outlet temperature value, the heater is turned on to make the air outlet temperature close to the preset air outlet temperature value.

[0018] Optionally, the air conditioning unit further comprises a humidifying nozzle,

[0019] The method further comprises:

[0020] Obtaining the current indoor humidity corresponding to the target air-conditioning unit;

[0021] The humidification nozzle is adjusted based on the current indoor humidity and a preset indoor humidity value.

[0022] Optionally, the air conditioning unit further includes a variable frequency scroll compressor.

[0023] The method further comprises:

[0024] When the current indoor temperature exceeds a preset temperature threshold, determining a return air volume;

[0025] Determine the heat exchange capacity corresponding to the air conditioning unit according to the primary return air volume, indoor enthalpy value, and outdoor enthalpy value;

[0026] The power of the variable frequency scroll compressor is adjusted based on the heat exchange amount.

[0027] Optionally, the method based on the current indoor humidity and a preset indoor humidity value includes:

[0028] Get the humidity of the air outlet;

[0029] Determine a preset humidity value for the air outlet according to the difference between the current indoor humidity and the preset indoor humidity value;

[0030] The humidification nozzle is adjusted based on the humidity of the air outlet and a preset humidity value of the air outlet.

[0031] A second aspect of the embodiments of the present application provides a control device for a secondary return air constant temperature and humidity air conditioning unit, the device comprising:

[0032] An acquisition module is used to obtain the current indoor temperature corresponding to the target air-conditioning unit;

[0033] The regulating module is used to regulate the opening of the first Venturi valve and the second Venturi valve based on the current indoor temperature and the preset indoor temperature value, so that the total return air volume flowing through the first Venturi valve and the second Venturi valve is within a preset range.

[0034] A third aspect of an embodiment of the present application provides an electronic device, comprising at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute the control method of the secondary return air constant temperature and humidity air-conditioning unit described in any one of the first aspects.

[0035] A fourth aspect of an embodiment of the present application provides a storage medium, which includes a stored program, wherein when the above-mentioned program is running, the device where the above-mentioned storage medium is located is controlled to execute the control method of the secondary return air constant temperature and humidity air-conditioning unit described in any one of the above-mentioned first aspects.

[0036] In summary, the control method of the secondary return air constant temperature and humidity air conditioning unit provided in the embodiment of the present application includes: obtaining the current indoor temperature corresponding to the target air conditioning unit; adjusting the opening of the first venturi valve and the second venturi valve based on the current indoor temperature and the preset indoor temperature value, so that the total return air volume flowing through the first venturi valve and the second venturi valve is within the preset range. The change in indoor load can be determined by the current indoor temperature and the preset indoor temperature value. When the current indoor temperature is less than the preset indoor temperature value, the indoor load decreases, and when the current indoor temperature is greater than the preset indoor temperature value, the indoor load increases. The required reheat amount can be determined based on the change in indoor load, the secondary return air volume can be determined according to the reheat amount and the current indoor temperature, the primary return air volume can be determined by the secondary return air volume, the opening of the air valve is determined based on the secondary return air volume and the primary return air volume, and the air volume can be accurately adjusted to the required value by using the venturi valve to control the primary return air volume and the secondary return air volume, and based on the pressure independence of the venturi valve, the interference between the primary return air and the secondary return air can be avoided, so that the control of the air volume is more accurate. The present application can accurately control the primary return air volume and the secondary return air volume by setting a Venturi valve, and then can provide accurate reheating heat through the secondary return air without setting up a heater. Therefore, the secondary return air regulation system can be applied to the constant temperature and humidity air-conditioning unit, reducing the problem of cold and heat offset in the primary return air regulation system, so that the characteristics of the secondary return air regulation system can be fully utilized to save the energy consumption of the constant temperature and humidity air-conditioning unit and reduce the area of ​​the evaporator.

[0037] Correspondingly, the control device, electronic device and computer-readable storage medium of the secondary return air constant temperature and humidity air-conditioning unit provided in the embodiments of the present application also have the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0039] Figure 1 A schematic flow chart of a possible control method of a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of an application scenario of a possible control method for a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0041] Figure 3 A psychrometric diagram corresponding to a possible control method for a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0042] Figure 4 A psychrometric diagram corresponding to another possible control method for a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0043] Figure 5 A schematic structural block diagram of a possible control device of a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0044] Figure 6 A schematic diagram of the hardware structure of a control device for a possible secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application;

[0045] Figure 7 A schematic structural block diagram of a possible electronic device provided in an embodiment of the present application;

[0046] Figure 8 A schematic structural block diagram of a possible computer-readable storage medium provided for an embodiment of the present application.

[0047] in, Figure 2 The corresponding relationship between the reference numerals and the component names is as follows:

[0048] 101 second venturi valve, 102 second humidity sensor, 103 second temperature sensor, 104 first venturi valve, 105 primary return air outlet, 106 variable frequency scroll compressor, 107 fresh air outlet, 108 humidification nozzle, 109 evaporator, 110 controller, 111 heater, 112 blower, 113 first humidity sensor, 114 first temperature sensor, 115 secondary return air outlet. DETAILED DESCRIPTION

[0049] The embodiment of the present application provides a control method and related equipment for a secondary return air constant temperature and humidity air conditioning unit, which can solve the problem of accurate control of the primary return air volume and the secondary return air volume of the secondary return air constant temperature and humidity air conditioning unit.

[0050] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application 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 data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0051] The secondary return air conditioning system can adjust the supply air temperature of the air-conditioning unit by controlling the secondary return air volume and the primary return air volume, thereby reducing the use of heaters to save energy. The constant temperature and humidity air-conditioning unit has strict requirements on temperature and humidity due to the particularity of the application scenario. With the widespread application of constant temperature and humidity process air-conditioning units, the energy consumption problem of constant temperature and humidity process air-conditioning units has received attention. However, the existing secondary return air conditioning system cannot accurately control the secondary return air volume and the primary return air volume, and then it is difficult to adjust the supply air temperature by controlling the return air volume. Therefore, the existing secondary return air conditioning system cannot be applied to the constant temperature and humidity process air-conditioning unit. Therefore, the existing secondary return air conditioning system is used in comfort air-conditioning units, that is, in places where the changes in temperature and humidity are not required.

[0052] In view of this, it is urgent to propose a control method for a secondary return air constant temperature and humidity air conditioning unit to at least solve the above technical problems.

[0053] First, see Figure 1 , which is a schematic flow chart of a control method for a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application, and may specifically include: S110-S120.

[0054] S110, obtaining the current indoor temperature corresponding to the target air-conditioning unit.

[0055] For example, Figure 2 As shown, to obtain the current indoor temperature corresponding to the target air-conditioning unit, a second temperature sensor 103 can be set at the inlet of the second Venturi valve 101. It is easy to understand that the inlet temperature of the second Venturi valve 101 is the current indoor temperature, so the current indoor temperature can be obtained according to the value of the second temperature sensor 103.

[0056] S120, adjusting the openings of the first Venturi valve 104 and the second Venturi valve 101 based on the current indoor temperature and the preset indoor temperature value.

[0057] For the sake of convenience, we first introduce the secondary return air conditioning system. Figure 3 As shown, Figure 3 The enthalpy-humidity diagram corresponding to the control method of a secondary return air constant temperature and humidity air conditioning unit provided in the embodiment of the present application, the indoor state point N and the outdoor state point W are mixed to reach point M, which is also the primary mixed air point M. The primary mixed air point M reaches the machine dew point P after being processed by the surface cooling section. The machine dew point P reaches point O after mixing with the secondary return air. Point O is the preset air supply point. The preset air supply point O is mixed with the indoor air and sent indoors to eliminate the indoor load and then reach the indoor state point N. At this time, the indoor state point N corresponds to the required indoor state parameters. Among them, the 95% relative humidity curve is only used as an example and is not specifically limited.

[0058] Exemplarily, the preset indoor temperature value can be artificially defined, and different values ​​can be adopted based on different situations. When the obtained current indoor temperature is different from the preset indoor temperature value, the supply air temperature value can be controlled by adjusting the primary and secondary return air volumes, and then the current indoor temperature is adjusted based on the supply air temperature value so that the current indoor temperature reaches the preset indoor temperature value.

[0059] It can be explained that if Figure 2 As shown, in the secondary return air system, the supply air volume is usually a fixed value, and the fresh air volume can be determined by the regulations according to the type of building object. Therefore, when the supply air volume and the fresh air volume are determined, the sum of the primary return air volume and the secondary return air volume is a fixed value. Among them, since the secondary return air does not pass through the evaporator 109, the primary return air is mixed with the fresh air passing through the fresh air port 107 and then passes through the evaporator 109. Therefore, the temperature value of the secondary return air is higher than the temperature value after the primary return air and the fresh air are mixed. Therefore, the secondary return air can replace the heater 111 to heat the primary mixed air after the primary return air and the fresh air pass through the evaporator 109. The purpose of controlling the supply air temperature can be achieved by adjusting the air volume ratio between the secondary return air and the primary return air.

[0060] It can be explained that the change in indoor load can be determined by the current indoor temperature and the preset indoor temperature value. When the current indoor temperature is less than the preset indoor temperature value, the indoor load decreases, and when the current indoor temperature is greater than the preset indoor temperature value, the indoor load increases. The required reheating amount can be determined based on the change in indoor load, the secondary return air volume can be determined based on the reheating amount and the current indoor temperature, the primary return air volume can be determined by the secondary return air volume, and the opening of the air valve can be determined based on the secondary return air volume and the primary return air volume. By using a Venturi valve to control the primary return air volume and the secondary return air volume, the air volume can be accurately adjusted to the required value, and based on the pressure independence of the Venturi valve, the interference between the primary return air and the secondary return air can be avoided, thereby making the control of the air volume more accurate. The present application can accurately control the primary return air volume and the secondary return air volume by setting a Venturi valve, and then can provide accurate reheating heat through the secondary return air without setting up a heater 111. Therefore, the secondary return air regulation system can be applied to the constant temperature and humidity air-conditioning unit, reducing the problem of cold and heat offset in the primary return air regulation system, so that the characteristics of the secondary return air regulation system can be fully utilized to save the energy consumption of the constant temperature and humidity air-conditioning unit and reduce the area of ​​the evaporator 109.

[0061] According to some embodiments, adjusting the opening of the first venturi valve 104 and the second venturi valve 101 based on the current indoor temperature and the preset indoor temperature value includes:

[0062] When the current indoor temperature is lower than the preset indoor temperature, the second venturi valve 101 is controlled to open wider and the first venturi valve 104 is controlled to open narrower; and / or,

[0063] When the current indoor temperature is greater than the preset indoor temperature value, the opening of the second Venturi valve 101 is controlled to become smaller, and the opening of the first Venturi valve 104 is controlled to become larger, wherein the first Venturi valve 104 is a control valve corresponding to controlling the primary return air volume, and the second Venturi valve 101 is a control valve corresponding to controlling the secondary return air volume.

[0064] For example, Figure 2 As shown, when the current indoor temperature is less than the preset indoor temperature value, the controller 110 controls the second venturi valve 101 to open wider, and the air volume entering the secondary return air port 115 increases, and the controller 110 controls the first venturi valve 104 to open narrower, and the air volume entering the primary return air port 105 decreases. By controlling the second venturi valve 101 to open wider, the secondary return air volume is increased, and controlling the first venturi valve 104 to open narrower, the primary return air volume is reduced, and then the air supply temperature of the air supply fan 112 can be increased, and the air supply is mixed with the indoor air to gradually increase the current indoor temperature to the preset indoor temperature value.

[0065] When the current indoor temperature is greater than the preset indoor temperature value, the controller 110 controls the second venturi valve 101 to open smaller, and the air volume entering the secondary return air port 115 becomes smaller, and the controller 110 controls the first venturi valve 104 to open larger, and the air volume entering the primary return air port 105 becomes larger. By controlling the second venturi valve 101 to open smaller, the secondary return air volume is reduced, and controlling the first venturi valve 104 to open larger, the primary return air volume is increased, and then the supply air temperature value of the blower 112 can be reduced, and the supply air is mixed with the indoor air to gradually reduce the current indoor temperature to the preset indoor temperature value.

[0066] According to some embodiments, the method further comprises:

[0067] Get the air outlet temperature;

[0068] Determining a second air supply volume based on a difference between a preset air supply temperature value and the air supply outlet temperature;

[0069] controlling the opening of the second venturi valve 101 according to the second air supply volume;

[0070] Determine the first air supply volume according to the second air supply volume and the total return air volume;

[0071] The opening degree of the first venturi valve 104 is controlled by the first air supply volume.

[0072] For example, Figure 2 As shown, a first temperature sensor 114 can be set at the air supply outlet to obtain the air supply outlet temperature. The controller 110 can determine the second air supply volume according to the difference between the preset air supply temperature value and the air supply outlet temperature. The second air supply volume can be used to indicate the secondary return air volume. Therefore, the opening of the second venturi valve 101 can be controlled according to the second air supply volume. The first air supply volume can be determined based on the total return air volume and the second air supply volume. The first air supply volume can be used to indicate the primary return air volume. The opening of the first venturi valve 104 can be controlled according to the first air supply volume. The heat required for the secondary return air can be obtained by comparing the air supply outlet temperature with the preset air supply temperature value. The required secondary return air volume can be determined based on the heat and the current indoor temperature. The primary return air volume can be determined based on the secondary return air volume, so that the opening of the second venturi valve 101 and the first venturi valve 104 can be determined.

[0073] According to some embodiments, the method further comprises:

[0074] When the opening of the second venturi valve 101 reaches a preset opening and the air outlet temperature is lower than the preset air outlet temperature, the heater 111 is turned on to make the air outlet temperature close to the preset air outlet temperature.

[0075] For example, Figure 2 As shown, when the opening of the second venturi valve 101 reaches the preset opening, and the air outlet temperature value is less than the preset air supply temperature value, the controller 110 can turn on the heater 111 to heat the air to be supplied after the secondary return air and the primary mixed air are mixed, so that the air outlet temperature value is close to the preset air supply temperature value.

[0076] In some cases, the preset opening may be the maximum opening of the Venturi valve, such as Figure 4 As shown, Figure 4 The enthalpy-humidity diagram corresponding to another control method of the secondary return air constant temperature and humidity air conditioning unit provided in the embodiment of the present application, the indoor state point N and the outdoor state point W are mixed to form a primary mixed air point M, the primary mixed air point M reaches the machine dew point P after being processed by the surface cooling section, and the machine dew point P reaches the secondary mixed air point D after being mixed with the secondary return air. At this time, the temperature value of the secondary mixed air point D is less than the temperature value of the preset air supply point O. When the opening of the venturi valve reaches the maximum, the temperature value of the secondary mixed air point D is still less than the temperature value of the preset air supply point O. Then, the heater 111 can be turned on to make the temperature value of the secondary mixed air point D climb to the temperature value of the preset air supply point O. By setting the heater 111, when the heat provided by the secondary return air is insufficient, the heat of the secondary return air can be compensated, thereby improving the scope of application of the present application.

[0077] According to some embodiments, the air conditioning unit further comprises a humidifying nozzle 108,

[0078] The above method further includes:

[0079] Obtain the current indoor humidity corresponding to the target air-conditioning unit;

[0080] The humidifying nozzle 108 is adjusted based on the current indoor humidity and the preset indoor humidity value.

[0081] For example, Figure 2 As shown, a second humidity sensor 102 can be installed at the inlet of the second venturi valve 101 to obtain the current indoor humidity. Based on the current indoor humidity and the preset indoor humidity value, the controller 110 can adjust the humidification amount of the humidification nozzle 108 to control the moisture content of the primary mixed air, thereby controlling the moisture content of the supply air to ensure the constant humidity requirement.

[0082] According to some embodiments, the air conditioning unit further comprises a variable frequency scroll compressor 106,

[0083] The above method further includes:

[0084] When the current indoor temperature exceeds the preset temperature threshold, a return air volume is determined;

[0085] Determine the heat exchange capacity corresponding to the air conditioning unit according to the primary return air volume, indoor enthalpy value and outdoor enthalpy value;

[0086] The power of the variable frequency scroll compressor 106 is adjusted based on the heat exchange amount.

[0087] For example, Figure 2 As shown, in an environment requiring constant temperature and humidity, when the current indoor temperature exceeds the preset temperature threshold, the supply air temperature value needs to be adjusted so that the current indoor temperature meets the preset temperature threshold.

[0088] It can be explained that if Figure 3 or Figure 4 As shown, the indoor state point N and the outdoor state point W are mixed to reach the primary air mixing point M, and the primary air mixing point M is processed by the variable frequency scroll compressor 106, the evaporator 109, etc. to the machine dew point P, and the machine dew point P is mixed with the secondary return air to reach the preset air supply point O. It is easy to understand that the heat exchange includes both heat exchange and cold exchange to meet the different requirements of the heating or cooling conditions of the air conditioning unit.

[0089] In the present application, when the current indoor temperature exceeds the preset temperature threshold, the preset supply air temperature value can be determined, and the secondary return air volume can be determined based on the preset supply air temperature value. When the total return air volume remains unchanged, the primary return air volume can be determined, and the fresh air volume is a constant. Therefore, the primary mixed air volume can be determined based on the primary return air volume and the fresh air volume. The indoor enthalpy value and the outdoor enthalpy value can be obtained based on the indoor state point N and the outdoor state point W. According to the difference between the indoor enthalpy value and the outdoor enthalpy value and the primary mixed air volume, the primary mixed air point M to the machine dew point can be obtained. The heat exchange required for point P is based on the above heat exchange to adjust the power of the variable frequency scroll compressor 106. It is easy to understand that the heat exchange adjustment range of the variable frequency scroll compressor 106 is between 25% and 100%. The adjustment range is relatively large, which can better match the parameters of the primary return air volume. Moreover, because the primary return air volume is adjusted by the first Venturi valve 104, the actual primary return air volume can be closer to the primary return air volume required by the calculation. Therefore, the power of the adjusted variable frequency scroll compressor 106 is more accurate, which makes the energy consumption control of the compressor more precise.

[0090] According to some embodiments, the above-mentioned based on the above-mentioned current indoor humidity and the preset indoor humidity value includes:

[0091] Get the humidity of the air outlet;

[0092] Determine the preset humidity value of the air outlet according to the difference between the current indoor humidity and the preset indoor humidity value;

[0093] The humidifying nozzle is adjusted based on the humidity of the air outlet and the preset humidity value of the air outlet.

[0094] For example, Figure 2 As shown, the humidity of the air supply outlet can be obtained by a first humidity sensor 113 arranged at the air supply outlet, and the controller 110 can determine a preset humidity value of the air supply outlet based on the difference between the current indoor humidity and the preset indoor humidity value, and adjust the humidifying nozzle 108 according to the relationship between the above-mentioned air supply outlet humidity and the above-mentioned preset humidity value of the air supply outlet so that the humidity of the above-mentioned air supply outlet reaches the above-mentioned preset humidity value of the air supply outlet, thereby being able to more accurately control the moisture content of the supply air to ensure the constant humidity requirement.

[0095] The control method of the secondary return air constant temperature and humidity air conditioning unit is described above. The control device of the secondary return air constant temperature and humidity air conditioning unit in the embodiment of the present application is described below.

[0096] See also Figure 5 In the embodiment of the present application, an embodiment of a control device for a secondary return air constant temperature and humidity air conditioning unit is described, which may include:

[0097] An acquisition module 501 is used to acquire the current indoor temperature corresponding to the target air-conditioning unit;

[0098] The regulating module 502 is used to adjust the opening of the first Venturi valve 104 and the second Venturi valve 101 based on the current indoor temperature and the preset indoor temperature value so that the total return air volume flowing through the first Venturi valve 104 and the second Venturi valve 101 is within a preset range.

[0099] According to the control device of the secondary return air constant temperature and humidity air conditioning unit provided by the above embodiment, the change in indoor load can be determined by the current indoor temperature and the preset indoor temperature value. When the current indoor temperature is less than the preset indoor temperature value, the indoor load decreases, and when the current indoor temperature is greater than the preset indoor temperature value, the indoor load increases. The required reheating amount can be determined based on the change in indoor load, the secondary return air volume can be determined based on the reheating amount and the current indoor temperature, the primary return air volume can be determined by the secondary return air volume, and the opening of the air valve can be determined based on the secondary return air volume and the primary return air volume. The air volume can be accurately adjusted to the required value by using a Venturi valve to control the primary return air volume and the secondary return air volume, and based on the pressure independence of the Venturi valve, the interference between the primary return air and the secondary return air can be avoided, thereby making the control of the air volume more accurate. The present application can accurately control the primary return air volume and the secondary return air volume by setting a Venturi valve, and then can provide accurate reheating heat through the secondary return air without setting up a heater 111. The present application can apply the secondary return air regulation system to a constant temperature and humidity air-conditioning unit, thereby saving the energy consumption of the constant temperature and humidity air-conditioning unit and reducing the area of ​​the evaporator 109.

[0100] above Figure 5The control device of the secondary return air constant temperature and humidity air conditioning unit in the embodiment of the present application is described from the perspective of modular functional entity. The control device of the secondary return air constant temperature and humidity air conditioning unit in the embodiment of the present application is described in detail from the perspective of hardware processing. Please refer to Figure 6 , a schematic diagram of the hardware structure of a control device of a secondary return air constant temperature and humidity air conditioning unit provided in an embodiment of the present application includes:

[0101] An input device 601, an output device 602, a processor 603 and a memory 604, wherein the number of the processor 603 can be one or more. Figure 6 In some embodiments of the present application, the input device 601, the output device 602, the processor 603 and the memory 604 may be connected via a bus or other means, wherein: Figure 6 The example of connecting through bus is taken in the following.

[0102] Wherein, by calling the operation instructions stored in the memory 604, the processor 603 is used to execute the steps of the control method of the secondary return air constant temperature and humidity air-conditioning unit proposed in any one of the first aspects above.

[0103] In the specific implementation process, please refer to Figure 7 , Figure 7 This is a schematic structural block diagram of an electronic device provided in an embodiment of the present application. When the processor 720 executes the computer program 711 in the memory 710, it can achieve Figure 1 Any implementation method in the corresponding embodiment. Since the electronic device introduced in this embodiment is a device used to implement a system resource management device in the embodiment of the present application, based on the method introduced in the embodiment of the present application, the technical personnel in this field can understand the specific implementation method of the electronic device of this embodiment and its various variations, so how the electronic device implements the method in the embodiment of the present application is not described in detail here. As long as the equipment used by the technical personnel in this field to implement the method in the embodiment of the present application belongs to the scope of protection of this application.

[0104] See also Figure 8 , Figure 8 A schematic diagram of an embodiment of a computer-readable storage medium provided in an embodiment of the present application.

[0105] like Figure 8 As shown, this embodiment provides a computer-readable storage medium 800 on which a computer program 811 is stored. When the computer program 811 is executed by a processor, the steps of the control method of the secondary return air constant temperature and humidity air-conditioning unit proposed in any one of the first aspects above are implemented.

[0106] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] The present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device is caused to execute the following Figure 1 The process in the control method of the secondary return air constant temperature and humidity air-conditioning unit in the corresponding embodiment.

[0110] The above-mentioned computer program product includes one or more computer instructions. When the above-mentioned computer program instructions are loaded and executed on a computer, the above-mentioned process or function according to the embodiment of the present application is generated in whole or in part. The above-mentioned computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The above-mentioned computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the above-mentioned computer instructions may be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The above-mentioned computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integrated. The above-mentioned available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (solid state disk, SSD)), etc.

[0111] Those skilled in the art can 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.

[0112] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above units is 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. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0113] The units described above 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 distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0114] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0115] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0116] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for a secondary return air constant temperature and humidity air conditioning unit, characterized in that: include: Get the current indoor temperature corresponding to the target air-conditioning unit; The openings of the first and second venturi valves are adjusted based on the current indoor temperature and a preset indoor temperature value so that the total return air volume flowing through the first and second venturi valves is within a preset range.

2. The method according to claim 1, characterized in that The adjusting the openings of the first venturi valve and the second venturi valve based on the current indoor temperature and the preset indoor temperature value includes: When the current indoor temperature is lower than the preset indoor temperature value, the second Venturi valve is controlled to open wider and the first Venturi valve is controlled to open narrower; and / or When the current indoor temperature is greater than the preset indoor temperature value, the opening of the second Venturi valve is controlled to become smaller, and the opening of the first Venturi valve is controlled to become larger, wherein the first Venturi valve is a control valve corresponding to controlling the primary return air volume, and the second Venturi valve is a control valve corresponding to controlling the secondary return air volume.

3. The method according to claim 2, characterized in that Also includes: Get the air outlet temperature; determining a second air supply volume based on a difference between a preset air supply temperature value and the air supply outlet temperature; controlling the opening of the second venturi valve according to the second air supply volume; determining a first air supply volume according to the second air supply volume and the total return air volume; The opening of the first Venturi valve is controlled by the first air supply volume.

4. The method according to claim 3, characterized in that Also includes: When the opening of the second venturi valve reaches a preset opening and the air outlet temperature is lower than the preset air outlet temperature value, the heater is turned on to make the air outlet temperature close to the preset air outlet temperature value.

5. The method according to any one of claims 1 to 4, characterized in that The air conditioning unit further comprises a humidifying nozzle, The method further comprises: Obtaining the current indoor humidity corresponding to the target air-conditioning unit; The humidification nozzle is adjusted based on the current indoor humidity and a preset indoor humidity value.

6. The method according to any one of claims 1 to 4, characterized in that The air conditioning unit also includes a variable frequency scroll compressor, The method further comprises: When the current indoor temperature exceeds a preset temperature threshold, determining a return air volume; Determining the heat exchange capacity corresponding to the air-conditioning unit according to the primary return air volume, the indoor enthalpy value, and the outdoor enthalpy value; The power of the variable frequency scroll compressor is adjusted based on the heat exchange amount.

7. The method according to claim 5, characterized in that The method based on the current indoor humidity and the preset indoor humidity value includes: Get the humidity of the air outlet; Determining a preset humidity value for the air outlet according to the difference between the current indoor humidity and the preset indoor humidity value; The humidifying nozzle is adjusted based on the humidity of the air outlet and a preset humidity value of the air outlet.

8. A control device for a secondary return air air conditioning unit, characterized in that: include: An acquisition module is used to obtain the current indoor temperature corresponding to the target air-conditioning unit; The adjustment module is used to adjust the opening of the first Venturi valve and the second Venturi valve based on the current indoor temperature and the preset indoor temperature value so that the total return air volume flowing through the first Venturi valve and the second Venturi valve is within a preset range.

9. An electronic device, characterized in that: The electronic device includes at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute the control method of the secondary return air constant temperature and humidity air-conditioning unit according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the secondary return air constant temperature and humidity air conditioning unit according to any one of claims 1 to 7.

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