Control method and device of fresh air integrated unit

Abstract

The application discloses a control method and device of a fresh air integrated unit, and relates to the technical field of air conditioning equipment. The method comprises the following steps: acquiring an outdoor temperature parameter Tw, a return air temperature parameter Tn and a supply air temperature parameter Ts, and judging the size relationship of the above parameters; when the return air temperature parameter Tn is less than the outdoor temperature parameter Tw, entering a pure mechanical refrigeration mode, in which the refrigeration system is controlled to start, the fresh air valve is controlled to be closed, and the return air valve is controlled to be opened; when the supply air temperature parameter Ts is less than or equal to the outdoor temperature parameter Tw and the outdoor temperature parameter Tw is less than or equal to the return air temperature parameter Tn, entering a mixed refrigeration mode, in which the refrigeration system is controlled to start, the fresh air valve is controlled to be opened, and the return air valve is controlled to be opened or closed; and when the outdoor temperature parameter Tw is less than the supply air temperature parameter Ts, entering a fresh air refrigeration mode, in which the refrigeration system is controlled to stop running, the fresh air valve is controlled to be opened, and the return air valve is controlled to be opened or closed. Through adaptive switching among the three refrigeration modes, the utilization rate of outdoor air can be improved, and the energy consumption can be reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to a control method and device for an integrated fresh air unit. Background Technology

[0002] In one existing integrated fresh air unit, the cooling components can be turned on for mechanical cooling, or outdoor air can be received for fresh air cooling. However, the switching of cooling mode mainly relies on manual judgment, which reduces the utilization rate of outdoor cold air, increases the start-up time of the cooling system, and is not conducive to energy saving.

[0003] Therefore, how to reduce energy consumption is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a control method and system for an integrated fresh air unit, which can improve the utilization rate of outdoor cold air during the cooling process and reduce energy consumption.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A control method for an integrated fresh air handling unit is provided, which is applied to the integrated fresh air handling unit. The integrated fresh air handling unit includes a fresh air duct, a return air duct, and a supply air duct. A fresh air valve is provided between the fresh air duct and the supply air duct to control the on / off state of the two channels. A return air valve is provided between the return air duct and the supply air duct to control the on / off state of the two channels. The integrated fresh air handling unit also includes a refrigeration system capable of cooling the supply air duct.

[0007] The method includes:

[0008] Obtain outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts;

[0009] Determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts:

[0010] When the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical cooling mode. In the pure mechanical cooling mode, the cooling system is started, the fresh air valve is closed, and the return air valve is opened.

[0011] When the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the system is controlled to start, the fresh air valve is controlled to open, and the return air valve is controlled to open or close.

[0012] When the outdoor temperature parameter Tw is less than the supply air temperature parameter Ts, the system enters the fresh air cooling mode. In the fresh air cooling mode, the cooling system is stopped, the fresh air valve is opened, and the return air valve is opened or closed.

[0013] Preferably, the hybrid cooling mode includes a first control stage, which includes:

[0014] The system controls the refrigeration system to start, controls the fresh air valve to open to its maximum opening, and controls the return air valve to close.

[0015] Preferably, the hybrid cooling mode includes a second control stage, which includes:

[0016] The system controls the refrigeration system to start, controls the fresh air valve to open to a first opening degree, and controls the return air valve to open to a second opening degree.

[0017] Determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0018] When the supply air temperature parameter Ts is less than the preset target temperature range, the opening of the fresh air valve is reduced, and the opening of the return air valve is increased.

[0019] When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve is increased, and the opening of the return air valve is decreased.

[0020] Preferably, the refrigeration system includes a compressor, an evaporator connected to the inlet of the compressor, and a condenser connected to the outlet of the compressor. The evaporator is located in the air supply duct, and the condenser is located in the fresh air duct. The outlet pressure of the compressor is the condensing pressure Pi.

[0021] The hybrid cooling mode includes:

[0022] Determine the relationship between the condensing pressure Pi and the preset condensing pressure range:

[0023] When the condensing pressure Pi is greater than the preset condensing pressure range, the opening of the fresh air valve is reduced, and the opening of the return air valve is increased.

[0024] When the condensing pressure Pi is less than the preset condensing pressure range, the opening of the fresh air valve is increased, and the opening of the return air valve is decreased.

[0025] Preferably, the refrigeration system includes a compressor, an evaporator connected to the inlet of the compressor, and a condenser connected to the outlet of the compressor. The evaporator is located in the air supply duct, and the condenser is located in the fresh air duct. The inlet pressure of the compressor is the evaporation pressure Pz.

[0026] The hybrid cooling mode includes:

[0027] Determine the relationship between the evaporation pressure Pz and the preset evaporation pressure range:

[0028] When the evaporation pressure Pz is less than the preset evaporation pressure range, the return air valve is controlled to open to the maximum degree.

[0029] Preferably, in the fresh air control mode, controlling the refrigeration system to stop operating, controlling the fresh air valve to open, and controlling the return air valve to open or close include:

[0030] The system is controlled to stop operating, the fresh air valve is controlled to open to its maximum opening degree, and the return air valve is controlled to close.

[0031] Determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0032] When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve is controlled to open and the opening degree is gradually increased. If the supply air temperature parameter Ts is within the preset target temperature range when the opening degree of the return air valve increases to the third opening degree, the return air valve is kept at the preset third opening degree. If the supply air temperature parameter Ts is still less than the preset target temperature range when the opening degree of the return air valve increases to the maximum opening degree, the opening degree of the fresh air valve is controlled to decrease.

[0033] A control device for an integrated fresh air handling unit is provided, which includes a fresh air duct, a return air duct, and a supply air duct. A fresh air valve is provided between the fresh air duct and the supply air duct to control the connection and disconnection between the two channels. A return air valve is provided between the return air duct and the supply air duct to control the connection and disconnection between the two channels. The integrated fresh air handling unit also includes a refrigeration system capable of cooling the supply air duct.

[0034] The control device includes:

[0035] The detection module is used to acquire outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts;

[0036] The first judgment module is used to determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts:

[0037] When the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical cooling mode. In the pure mechanical cooling mode, the cooling system is started, the fresh air valve is closed, and the return air valve is opened.

[0038] When the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the system is controlled to start, the fresh air valve is controlled to open, and the return air valve is controlled to open or close.

[0039] When the outdoor temperature parameter Tw is less than the supply air temperature parameter Ts, the system enters the fresh air cooling mode. In the fresh air cooling mode, the cooling system is stopped, the fresh air valve is opened, and the return air valve is opened or closed.

[0040] Preferably, the hybrid cooling mode includes a first control module for executing a first control phase, the first control phase including:

[0041] The system controls the refrigeration system to start, controls the fresh air valve to open to its maximum opening, and controls the return air valve to close.

[0042] Preferably, the hybrid cooling mode includes a second control module for executing a second control phase, the second control module comprising:

[0043] The second control unit is used to control the refrigeration system to start, control the fresh air valve to open to a first opening degree, and control the return air valve to open to a second opening degree.

[0044] The second judgment unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0045] When the supply air temperature parameter Ts is less than the preset target temperature range, the opening of the fresh air valve is reduced, and the opening of the return air valve is increased.

[0046] When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve is increased, and the opening of the return air valve is decreased.

[0047] Preferably, the first judgment module includes a fresh air control module that executes fresh air control in the fresh air control mode, the fresh air control module comprising:

[0048] The fresh air control unit is used to control the refrigeration system to stop operating, control the fresh air valve to open to the maximum opening degree, and control the return air valve to close.

[0049] The fresh air detection unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range.

[0050] When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve is controlled to open and the opening degree is gradually increased. If the supply air temperature parameter Ts is within the preset target temperature range when the opening degree of the return air valve increases to the third opening degree, the return air valve is kept at the preset third opening degree. If the supply air temperature parameter Ts is still less than the preset target temperature range when the opening degree of the return air valve increases to the maximum opening degree, the opening degree of the fresh air valve is controlled to decrease.

[0051] The control method and device provided by this invention can adaptively switch between three cooling modes—pure mechanical cooling mode, hybrid cooling mode, and fresh air cooling mode—by comparing temperature parameters at different locations of the integrated fresh air unit. This can improve the utilization rate of outdoor air during the cooling process, reduce the start-up rate and energy consumption of cooling components, increase the utilization rate of outdoor cold air during the cooling process, and reduce energy consumption. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0053] Figure 1 This is a structural diagram of the integrated fresh air unit used in the control method provided by the present invention;

[0054] Figure 2 The airflow diagram for the control method provided by this invention in pure mechanical refrigeration mode;

[0055] Figure 3 This is a diagram showing the airflow path of the control method provided by the present invention in hybrid cooling mode.

[0056] Figure 4 This is an airflow diagram showing another operating state of the control method provided by the present invention in the hybrid cooling mode;

[0057] Figure 5 The diagram shows the airflow path of the control method provided by this invention in the fresh air cooling mode with the return air valve closed.

[0058] Figure 6 The diagram shows the airflow path of the control method provided by this invention in the fresh air cooling mode with the return air valve open.

[0059] Figure 7 A flowchart of the control method provided by the present invention.

[0060] Figure label:

[0061] 1. Indoor fan, 2. Evaporator, 3. Fresh air valve, 4. Fresh air filter, 5. Condenser, 6. Weight-bearing air valve, 7. Outdoor fan, 8. Pipe joint, 9. Return air valve, 10. Electrical control system, 11. Compressor, 12. Drainage system, 13. Air guide louvers, 14. Adjustable feet, 15. Exhaust vent, 16. Fresh air inlet, 17. Supply air outlet, 18. Return air outlet, 19. Fresh air duct, 20. Return air duct, 21. Supply air duct. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] The core of this invention is to provide a control method and system for an integrated fresh air unit, which can improve the utilization rate of outdoor cold air during the cooling process and reduce energy consumption.

[0064] The control method for integrated fresh air handling units provided by this invention is applied to integrated fresh air handling units. For example... Figure 1 As shown, the integrated fresh air unit includes a casing, within which are housed a refrigeration system, an electrical control system 10, a drainage system 12, air guide louvers 13, adjustable feet 14, pipe connectors 8, and other structures. This control method can be executed through the electrical control system 10. This integrated fresh air unit can be installed in environments such as data center server rooms.

[0065] The housing contains a fresh air duct 19, a return air duct 20, and a supply air duct 21, with the fresh air duct 19 and the return air duct 20 separated. One end of the fresh air duct 19 has a fresh air inlet 16 for introducing outdoor air, and the other end connects to the supply air duct 21. A fresh air valve 3 is installed between the fresh air duct 19 and the supply air duct 21 to control the opening and closing of the two ducts. One end of the return air duct 20 has a return air outlet 18 for introducing indoor air, and the other end connects to the supply air duct 21. A return air valve 9 is installed between the return air duct 20 and the supply air duct 21 to control the opening and closing of the two ducts. The supply air duct 21 receives air from the fresh air duct 19 and / or the return air duct 20, and then discharges it into the room through the supply air outlet 17. The refrigeration system can cool the supply air duct 21.

[0066] The refrigeration components in the refrigeration system are housed in the air supply duct 21 for refrigeration. Specifically, the refrigeration components include the evaporator 2. The refrigeration system also includes a compressor 11, a condenser 5, and a throttling valve. The compressor 11 is located in the air supply duct 21, and the condenser 5 is located in the fresh air duct 19. The refrigerant absorbs heat and evaporates into low-temperature, low-pressure vapor in the evaporator 2. The compressor 11 performs work on the low-temperature, low-pressure vapor, transforming it into high-temperature, high-pressure vapor. The high-temperature, high-pressure vapor releases heat and condenses in the condenser 5 before returning to the evaporator 2, completing one refrigeration cycle. Additionally, the integrated fresh air unit also includes an internal fan 1, an external fan 7, and a weight-bearing damper 6 within the casing. The internal fan 1 is located near the air supply outlet 17, and the external fan 7 is located between the exhaust outlet 15 and the condenser 5. The external fan 7 discharges hot air from the condenser 5 to the exhaust outlet 15. Optionally, a weight-bearing damper 6 is installed on the exhaust outlet 15, allowing air in the casing to overcome the weight of the damper 6 and be discharged through the exhaust outlet 15.

[0067] In a specific embodiment one of the control method provided by the present invention, it includes:

[0068] S1: Obtain outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts.

[0069] Each temperature parameter can be either the detected temperature value itself or the temperature value calculated based on needs, experience, or set rules.

[0070] The outdoor temperature parameter Tw is a parameter that measures the temperature at a designated outdoor location, such as the temperature at the fresh air inlet 16. Specifically, the outdoor temperature parameter Tw is the actual detected outdoor temperature value tw at the designated outdoor location.

[0071] The return air temperature parameter Tn is a parameter that measures the temperature at a set location near the return air vent 18 in the room. Specifically, the return air temperature parameter Tn = the detected return air temperature value tn at the set location - temperature hysteresis ΔT. By applying the temperature hysteresis ΔT, a buffer space can be provided to avoid frequent switching of cooling modes. The temperature hysteresis ΔT can be set according to actual needs.

[0072] The supply air temperature parameter Ts is a parameter that measures the temperature at a set location near the air outlet 17 in the room. Specifically, the supply air temperature parameter Ts = the detected supply air temperature value ts at the set location - temperature hysteresis ΔT.

[0073] S2: Determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts:

[0074] S21: As Figure 2As shown, when the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical cooling mode. In the pure mechanical cooling mode, the cooling system is started, the fresh air valve 3 is closed, and the return air valve 9 is opened.

[0075] Under these temperature conditions, the outdoor temperature is high, and the outdoor air is not suitable for indoor cooling. At this time, the fresh air valve 3 is closed, and the return air valve 9 is opened, specifically to its maximum opening. The integrated fresh air unit only circulates air indoors, and outdoor fresh air does not enter the room.

[0076] S22: As Figure 3 and Figure 4 As shown, when the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the cooling system is started, the fresh air valve 3 is opened, and the return air valve 9 is opened or closed.

[0077] Under these temperature conditions, the outdoor air temperature is already low enough, so it is sent into the supply air duct 21 for cooling. Compared to the air entering through the return air vent 18, the hybrid cooling mode combining mechanical cooling and fresh air cooling can achieve cooling faster and consume less energy. At this time, the fresh air valve 3 is opened, allowing the cold outdoor air to enter the supply air duct 21 through the fresh air duct 19 and the fresh air valve 3, where it is cooled, and then enters the room through the air outlet 17.

[0078] The opening degree of the fresh air valve 3 and the opening and closing of the return air valve 9 can be controlled as needed. When the return air valve 9 is opened, the air from the return air duct 20 and the fresh air duct 19 can both enter the supply air duct 21 and mix. At this time, due to the temperature difference of the outdoor air, the temperature of the mixed air can be reduced accordingly, thereby reducing the operating frequency of the compressor 11 in the refrigeration system and improving the heat exchange effect.

[0079] S23: As Figure 5 and Figure 6 As shown, when the outdoor temperature parameter Tw is less than the supply air temperature parameter Ts, the system enters the fresh air cooling mode. In the fresh air cooling mode, the cooling system is stopped, the fresh air valve 3 is opened, and the return air valve 9 is opened or closed.

[0080] Under these temperature conditions, the outdoor air temperature is lower, eliminating the need to activate the refrigeration system to supplement cooling capacity; the outdoor fresh air can be used independently for indoor cooling. Specifically, the opening of the fresh air valve 3 and the return air valve 9 is controlled according to the required supply air temperature value, such as the relationship between the supply air temperature parameter and the preset temperature range.

[0081] In this embodiment, by comparing the temperature parameters at different locations of the integrated fresh air unit, the system can adaptively switch between three cooling modes: pure mechanical cooling mode, hybrid cooling mode, and fresh air cooling mode. This can improve the utilization rate of outdoor air during the cooling process, reduce the start-up rate of cooling components, increase the utilization rate of outdoor cold air during the cooling process, and reduce energy consumption.

[0082] Furthermore, the hybrid cooling mode specifically includes a first control phase, which can be performed immediately upon entering the hybrid cooling mode.

[0083] The first control phase includes: controlling the refrigeration system to start, controlling the fresh air valve 3 to open to its maximum opening, and controlling the return air valve 9 to close.

[0084] In this embodiment, more fresh air is introduced for cooling during the first control stage, which is more conducive to reducing the energy consumption of the cooling system.

[0085] Furthermore, the hybrid cooling mode also includes a second control stage, which includes:

[0086] The system is controlled to start, the fresh air valve 3 is controlled to open to the first opening degree, and the return air valve 9 is controlled to open to the second opening degree.

[0087] Determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0088] When the supply air temperature parameter Ts is less than the preset target temperature range, the opening of the fresh air valve 3 is reduced, and the opening of the return air valve 9 is increased.

[0089] When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve 3 is increased, and the opening of the return air valve 9 is decreased.

[0090] This state can be the initial state of the second control stage, and the fresh air valve 3 and return air valve 9 are adjusted based on this state.

[0091] The preset range can be a set value or a range consisting of a series of values. Less than or below the preset range refers to the minimum value of the preset range, greater than or above the preset range refers to the maximum value of the preset range, and within the preset range refers to the value that is not less than the minimum value of the preset range and not greater than the maximum value of the preset range.

[0092] The second control phase can occur after the first control phase. The switching mechanism between these two phases can be based on duration; that is, the second control phase begins after the first control phase has run for a preset duration. Alternatively, the switching mechanism can be based on temperature conditions. For example, in the first control phase, the relationship between the supply air temperature parameter Ts and the preset target temperature range is determined. When the supply air temperature parameter Ts falls within the preset target temperature range, the second control phase begins.

[0093] In the second control stage, the cooling capacity of the refrigeration system can also be adjusted compared to the first control stage. For example, in the first control stage, the compressor 11 operates at a first frequency, while in the second control stage, the compressor 11 operates at a second frequency lower than the first frequency.

[0094] In this embodiment, during the second control phase, when the supply air temperature parameter Ts is lower than the preset target temperature range, the fresh air valve 3 is gradually closed and the return air valve 9 is gradually opened; when the supply air temperature parameter Ts is higher than the preset target temperature range, the fresh air valve 3 is gradually opened and the return air valve 9 is gradually closed. This allows for better cooling by utilizing the lower-temperature fresh air while meeting the supply air temperature requirements. Of course, in other embodiments, the hybrid cooling mode may also include either the first control phase or the second control phase.

[0095] Furthermore, the refrigeration system includes a compressor 11, an evaporator 2 connected to the inlet of the compressor 11, and a condenser 5 connected to the outlet of the compressor 11. The evaporator 2 is located in the supply air duct 21, and the condenser 5 is located in the fresh air duct 19. The outlet pressure of the compressor 11 is the condensing pressure Pi, and the inlet pressure of the compressor 11 is the evaporating pressure Pz. Since the fresh air valve 3 is located between the evaporator 2 and the condenser 5, when the fresh air valve 3 is opened, outdoor fresh air is not only used for cooling the condenser 5, but also partially introduced into the room, resulting in a draft. By judging the condensing pressure Pi and the evaporating pressure Pz and applying this judgment to the valve opening control, the impact of draft on the compressor 11 can be avoided. A fresh air filter 4 is installed between the evaporator 2 and the fresh air valve 3.

[0096] Specifically, the hybrid cooling mode includes:

[0097] Determine the relationship between the condensing pressure Pi and the preset condensing pressure range:

[0098] When the condensing pressure Pi is greater than the preset condensing pressure range, the opening of the fresh air valve 3 is reduced, and the opening of the return air valve 9 is increased.

[0099] When the condensing pressure Pi is less than the preset condensing pressure range, the opening of the fresh air valve 3 is increased, and the opening of the return air valve 9 is decreased.

[0100] Regarding condensing pressure, the higher the condensing pressure, the higher the condensing temperature. By increasing the opening of the return air valve 9, the airflow at the evaporator 2 can be guaranteed, allowing more fresh air to be used for cooling the condenser 5. The lower the condensing pressure, the lower the condensing temperature, allowing more outdoor fresh air to be introduced into the room for cooling.

[0101] Specifically, the hybrid cooling mode includes:

[0102] Determine the relationship between the evaporation pressure Pz and the preset evaporation pressure range:

[0103] When the evaporation pressure Pz is less than the preset evaporation pressure range, the return air valve 9 is controlled to open to the maximum degree.

[0104] Since low evaporation pressure reduces cooling capacity and increases compressor 11 power consumption, opening the return air valve 9 to its maximum can ensure return air volume and alleviate the evaporation pressure problem.

[0105] In the hybrid cooling mode, since control is based on the judgment results of supply air temperature parameter Ts, condensing pressure Pi, and evaporating pressure Pz, a priority can be set. When conflicting control methods arise, the higher-level control method will be used. For example, the priority could be: control based on supply air temperature parameter Ts > control based on condensing pressure Pi > control based on evaporating pressure Pz.

[0106] Furthermore, in the fresh air control mode, controlling the cooling system to stop operating, controlling the fresh air valve 3 to open, and controlling the return air valve 9 to open or close specifically includes:

[0107] The refrigeration system is stopped from operating; the fresh air valve 3 is opened to its maximum opening degree; and the return air valve 9 is closed.

[0108] Determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0109] When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve 9 is controlled to open and the opening degree gradually increases. If the supply air temperature parameter Ts is within the preset target temperature range when the opening degree of the return air valve 9 increases to the third opening degree, the return air valve 9 is maintained at the preset third opening degree. If the supply air temperature parameter Ts is still less than the preset target temperature range when the opening degree of the return air valve 9 increases to the maximum opening degree, the opening degree of the fresh air valve 3 is controlled to decrease.

[0110] In this embodiment, under fresh air cooling mode, the fresh air valve 3 is opened to its maximum value first, with the preset target temperature range as the control target. When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve 9 is gradually opened to bring the supply air temperature parameter Ts closer to the preset target temperature range, until the return air valve 9 is opened to its maximum value. If the supply air temperature parameter Ts is still lower than the preset target temperature range, the fresh air valve 3 is gradually closed to bring the supply air temperature parameter Ts closer to the preset target temperature range. If the supply air temperature parameter Ts is still less than the preset target temperature range even when the fresh air valve 3 is fully closed, it indicates that cooling is not required at this time.

[0111] The control method provided in this embodiment can automatically and adaptively switch between pure mechanical cooling mode, hybrid cooling mode and fresh air cooling mode based on the judgment of the temperature in the environment. It can achieve the maximum energy efficiency ratio, make more use of fresh air, and keep the integrated fresh air unit in a better parameter state, with good energy saving and safety.

[0112] In addition, the present invention also provides a control device for a fresh air integrated unit that implements the above control method. The fresh air integrated unit includes a fresh air duct 19, a return air duct 20, and a supply air duct 21. A fresh air valve 3 is provided between the fresh air duct 19 and the supply air duct 21 to control the on / off state between the two channels. A return air valve 9 is provided between the return air duct 20 and the supply air duct 21 to control the on / off state between the two channels. The fresh air integrated unit also includes a refrigeration system capable of cooling the supply air duct 21.

[0113] The control device includes:

[0114] The detection module is used to acquire outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts;

[0115] The first judgment module is used to determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts:

[0116] When the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical cooling mode. In the pure mechanical cooling mode, the cooling system is started, the fresh air valve 3 is closed, and the return air valve 9 is opened.

[0117] When the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the cooling system is started, the fresh air valve 3 is opened, and the return air valve 9 is opened or closed.

[0118] When the outdoor temperature parameter Tw is less than the supply air temperature parameter Ts, the system enters the fresh air cooling mode. In the fresh air cooling mode, the cooling system is stopped, the fresh air valve 3 is opened, and the return air valve 9 is opened or closed.

[0119] Furthermore, the hybrid cooling mode includes a first control module for executing a first control phase, the first control phase including:

[0120] The system controls the refrigeration system to start, controls the fresh air valve 3 to open to its maximum degree, and controls the return air valve 9 to close.

[0121] Furthermore, the hybrid cooling mode includes a second control module for executing a second control phase, the second control module comprising:

[0122] The second control unit is used to control the start of the refrigeration system, control the opening of the fresh air valve 3 to a first opening degree, and control the opening of the return air valve 9 to a second opening degree.

[0123] The second judgment unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range:

[0124] When the supply air temperature parameter Ts is less than the preset target temperature range, the opening of the fresh air valve 3 is reduced, and the opening of the return air valve 9 is increased.

[0125] When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve 3 is increased, and the opening of the return air valve 9 is decreased.

[0126] Furthermore, the refrigeration system includes a compressor 11, an evaporator 2 connected to the inlet of the compressor 11, and a condenser 5 connected to the outlet of the compressor 11. The evaporator 2 is located in the air supply duct 21, and the condenser 5 is located in the fresh air duct 19. The outlet pressure of the compressor 11 is the condensing pressure Pi.

[0127] The first determination module includes a hybrid control module that executes the hybrid control mode, wherein the hybrid control module includes:

[0128] The condensing pressure judgment unit is used to determine the relationship between the condensing pressure Pi and the preset condensing pressure range.

[0129] When the condensing pressure Pi is greater than the preset condensing pressure range, the opening of the fresh air valve 3 is reduced, and the opening of the return air valve 9 is increased.

[0130] When the condensing pressure Pi is less than the preset condensing pressure range, the opening of the fresh air valve 3 is increased, and the opening of the return air valve 9 is decreased.

[0131] Furthermore, the refrigeration system includes a compressor 11, an evaporator 2 connected to the inlet of the compressor 11, and a condenser 5 connected to the outlet of the compressor 11. The evaporator 2 is located in the air supply duct 21, and the condenser 5 is located in the fresh air duct 19. The inlet pressure of the compressor 11 is the evaporation pressure Pz.

[0132] The first determination module includes a hybrid control module that executes the hybrid control mode, wherein the hybrid control module includes:

[0133] Evaporation pressure judgment unit, used to determine the relationship between evaporation pressure Pz and preset evaporation pressure range:

[0134] When the evaporation pressure Pz is less than the preset evaporation pressure range, the return air valve 9 is controlled to open to the maximum degree.

[0135] Furthermore, the first judgment module includes a fresh air control module that executes fresh air control in the fresh air control mode, the fresh air control module comprising:

[0136] The fresh air control unit is used to control the refrigeration system to stop operating, control the fresh air valve 3 to open to the maximum opening degree, and control the return air valve 9 to close.

[0137] The fresh air detection unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range.

[0138] When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve 9 is controlled to open and the opening degree gradually increases. If the supply air temperature parameter Ts is within the preset target temperature range when the opening degree of the return air valve 9 increases to the third opening degree, then the return air valve 9 remains at the preset third opening degree. If the supply air temperature parameter Ts is still less than the preset target temperature range when the opening degree of the return air valve 9 increases to the maximum opening degree, then the opening degree of the fresh air valve 3 is controlled to decrease.

[0139] It should be noted that when an element is referred to as "fixing" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this invention, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0140] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0141] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0142] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0143] The control method and apparatus provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A control method for an integrated fresh air handling unit, characterized in that, The integrated fresh air unit includes a fresh air duct (19), a return air duct (20), and a supply air duct (21). A fresh air valve (3) is provided between the fresh air duct (19) and the supply air duct (21) to control the opening and closing of the two channels. A return air valve (9) is provided between the return air duct (20) and the supply air duct (21) to control the opening and closing of the two channels. The integrated fresh air unit also includes a refrigeration system that can cool the supply air duct (21). The method includes: Obtain outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts; Determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts: When the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical refrigeration mode. In the pure mechanical refrigeration mode, the refrigeration system is started, the fresh air valve (3) is closed, and the return air valve (9) is opened. When the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the system is controlled to start, the fresh air valve (3) is controlled to open, and the return air valve (9) is controlled to open or close. When the outdoor temperature parameter Tw < the supply air temperature parameter Ts, the fresh air cooling mode is entered. In the fresh air cooling mode, the cooling system is controlled to stop running, the fresh air valve (3) is controlled to open, and the return air valve (9) is controlled to open or close. The hybrid cooling mode includes a second control stage, which includes: controlling the cooling system to start, controlling the fresh air valve (3) to open and the opening degree to be a first opening degree, controlling the return air valve (9) to open and the opening degree to be a second opening degree, and when the supply air temperature parameter Ts is less than the preset target temperature range, controlling the opening degree of the fresh air valve (3) to decrease and controlling the opening degree of the return air valve (9) to increase.

2. The control method according to claim 1, characterized in that, The hybrid cooling mode includes a first control phase, which includes: Control the refrigeration system to start, control the fresh air valve (3) to open to the maximum opening, and control the return air valve (9) to close.

3. The control method according to claim 1, characterized in that, In the hybrid cooling mode, during the second control phase: The process of controlling the refrigeration system to start, controlling the fresh air valve (3) to open to a first opening degree, and controlling the return air valve (9) to open to a second opening degree, further includes: When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve (3) is increased and the opening of the return air valve (9) is decreased.

4. The control method according to claim 1, characterized in that, The refrigeration system includes a compressor (11), an evaporator (2) connected to the inlet of the compressor (11), and a condenser (5) connected to the outlet of the compressor (11). The evaporator (2) is located in the air supply duct (21), and the condenser (5) is located in the fresh air duct (19). The outlet pressure of the compressor (11) is the condensing pressure Pi. The hybrid cooling mode includes: Determine the relationship between the condensing pressure Pi and the preset condensing pressure range: When the condensing pressure Pi is greater than the preset condensing pressure range, the opening of the fresh air valve (3) is reduced, and the opening of the return air valve (9) is increased. When the condensing pressure Pi is less than the preset condensing pressure range, the opening of the fresh air valve (3) is increased, and the opening of the return air valve (9) is decreased.

5. The control method according to claim 1, characterized in that, The refrigeration system includes a compressor (11), an evaporator (2) connected to the inlet of the compressor (11), and a condenser (5) connected to the outlet of the compressor (11). The evaporator (2) is located in the air supply duct (21), and the condenser (5) is located in the fresh air duct (19). The inlet pressure of the compressor (11) is the evaporation pressure Pz. The hybrid cooling mode includes: Determine the relationship between the evaporation pressure Pz and the preset evaporation pressure range: When the evaporation pressure Pz is less than the preset evaporation pressure range, the return air valve (9) is controlled to open to the maximum degree.

6. The control method according to claim 1, characterized in that, In the fresh air cooling mode, controlling the cooling system to stop operating, controlling the fresh air valve (3) to open, and controlling the return air valve (9) to open or close include: The refrigeration system is stopped, the fresh air valve (3) is opened to its maximum opening, and the return air valve (9) is closed. Determine the relationship between the supply air temperature parameter Ts and the preset target temperature range: When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve (9) is controlled to open and the opening degree gradually increases. If the opening degree of the return air valve (9) increases to the third opening degree and the supply air temperature parameter Ts is within the preset target temperature range, the return air valve (9) is kept at the third opening degree. If the opening degree of the return air valve (9) increases to the maximum opening degree and the supply air temperature parameter Ts is still less than the preset target temperature range, the opening degree of the fresh air valve (3) is controlled to decrease.

7. A control device for an integrated fresh air handling unit, characterized in that, The integrated fresh air unit includes a fresh air duct (19), a return air duct (20), and a supply air duct (21). A fresh air valve (3) is provided between the fresh air duct (19) and the supply air duct (21) to control the opening and closing of the two channels. A return air valve (9) is provided between the return air duct (20) and the supply air duct (21) to control the opening and closing of the two channels. The integrated fresh air unit also includes a refrigeration system that can cool the supply air duct (21). The control device includes: The detection module is used to acquire outdoor temperature parameter Tw, return air temperature parameter Tn, and supply air temperature parameter Ts; The first judgment module is used to determine the relationship between the outdoor temperature parameter Tw, the return air temperature parameter Tn, and the supply air temperature parameter Ts: When the return air temperature parameter Tn < the outdoor temperature parameter Tw, the system enters a pure mechanical refrigeration mode. In the pure mechanical refrigeration mode, the refrigeration system is started, the fresh air valve (3) is closed, and the return air valve (9) is opened. When the supply air temperature parameter Ts ≤ outdoor temperature parameter Tw ≤ return air temperature parameter Tn, the system enters the mixed cooling mode. In the mixed cooling mode, the system is controlled to start, the fresh air valve (3) is controlled to open, and the return air valve (9) is controlled to open or close. When the outdoor temperature parameter Tw < the supply air temperature parameter Ts, the fresh air cooling mode is entered. In the fresh air cooling mode, the cooling system is controlled to stop running, the fresh air valve (3) is controlled to open, and the return air valve (9) is controlled to open or close. The hybrid cooling mode includes a second control stage, which includes: controlling the cooling system to start, controlling the fresh air valve (3) to open and the opening degree to be a first opening degree, controlling the return air valve (9) to open and the opening degree to be a second opening degree, and when the supply air temperature parameter Ts is less than the preset target temperature range, controlling the opening degree of the fresh air valve (3) to decrease and controlling the opening degree of the return air valve (9) to increase.

8. The control device according to claim 7, characterized in that, The hybrid cooling mode includes a first control module for executing a first control phase, which includes: Control the refrigeration system to start, control the fresh air valve (3) to open to the maximum opening, and control the return air valve (9) to close.

9. The control device according to claim 7, characterized in that, The hybrid cooling mode includes a second control module for executing a second control phase. The second control module includes: The second control unit is used to control the start of the refrigeration system, control the fresh air valve (3) to open and the opening degree to the first opening degree, and control the return air valve (9) to open and the opening degree to the second opening degree; The second judgment unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range: When the supply air temperature parameter Ts is less than the preset target temperature range, the opening of the fresh air valve (3) is reduced and the opening of the return air valve (9) is increased. When the supply air temperature parameter Ts is greater than the preset target temperature range, the opening of the fresh air valve (3) is increased and the opening of the return air valve (9) is decreased.

10. The control device according to claim 7, characterized in that, The first judgment module includes a fresh air control module that executes fresh air control in the fresh air cooling mode, the fresh air control module including: The fresh air control unit is used to control the refrigeration system to stop running, control the fresh air valve (3) to open and the opening degree to the maximum degree, and control the return air valve (9) to close. The fresh air detection unit is used to determine the relationship between the supply air temperature parameter Ts and the preset target temperature range. When the supply air temperature parameter Ts is less than the preset target temperature range, the return air valve (9) is controlled to open and the opening degree gradually increases. If the opening degree of the return air valve (9) increases to the third opening degree and the supply air temperature parameter Ts is within the preset target temperature range, the return air valve (9) is kept at the third opening degree. If the opening degree of the return air valve (9) increases to the maximum opening degree and the supply air temperature parameter Ts is still less than the preset target temperature range, the opening degree of the fresh air valve (3) is controlled to decrease.

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