Methods, apparatus, heat pump units, and storage media for controlling heat pump units

Abstract

This application relates to the field of drying technology, disclosing a method for controlling a heat pump unit, comprising: acquiring the evaporation temperature of the evaporator when the heat pump unit is operating in dehumidification mode; determining a target dehumidification mode for the heat pump unit based on the evaporation temperature; and controlling the on / off states of the exhaust valve, the fresh air valve, and the bypass ventilation valve based on the target dehumidification mode. The evaporation temperature can be used to determine the dehumidification capacity of the evaporator, i.e., whether the evaporator can perform normal dehumidification. This allows the dehumidification mode of the heat pump unit to be matched with the dehumidification capacity of the evaporator, thereby improving the accuracy of the heat pump unit in regulating the humidity of the drying room. This application also discloses a device for controlling a heat pump unit, a heat pump unit, and a storage medium.

Description

Technical Field

[0001] This application relates to the field of drying technology, for example to a method, apparatus, heat pump unit, and storage medium for controlling a heat pump unit. Background Technology

[0002] Drying ovens are generally used for drying agricultural products. Humidity control is crucial during the drying process. If the humidity inside the drying oven is too high, the moisture on the surface of the materials being dried cannot be drained in time, easily leading to mold and rot, and affecting the quality of the dried materials.

[0003] The related technology discloses a control method for drying equipment. The drying equipment includes: a first heat pump unit, which includes a first compressor, a first condenser, a first throttling device, and a first evaporator; a second heat pump unit, which includes a second compressor, a second condenser, a second throttling device, and a second evaporator; a main air duct, which is equipped with a heat pipe heat exchanger; a fresh air duct, whose air inlet is connected to the outside space and whose air outlet is connected to the heat recovery air duct, and whose air outlet faces the condensing section of the heat pipe heat exchanger; a fresh air valve is provided at the air inlet of the fresh air duct; when the dry bulb temperature in the drying chamber is less than a temperature threshold, the following operations are also performed: if the wet bulb temperature in the drying chamber is less than a low humidity threshold, the exhaust valve and the fresh air valve are controlled to close; if the low humidity threshold is less than or equal to the wet bulb temperature in the drying chamber and less than a high humidity threshold, the exhaust valve and the fresh air valve are controlled to close; if the wet bulb temperature in the drying chamber is greater than or equal to the high humidity threshold, the exhaust valve and the fresh air valve are controlled to open. When the dry bulb temperature in the drying oven is greater than or equal to the temperature threshold, the following operations are performed: the first compressor, the second compressor, the first throttling device, the second throttling device, the dehumidification throttling device, and the internal dehumidification circulating fan are all shut down, while the main circulating fan is running; if the wet bulb temperature in the drying oven is less than the high humidity threshold, the exhaust valve and the fresh air valve are shut down; if the wet bulb temperature in the drying oven is greater than or equal to the high humidity threshold, the exhaust valve and the fresh air valve are opened.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Simply controlling the opening and closing of the dehumidification valve and the fresh air valve is far from sufficient to achieve precise control of the humidity in the drying room.

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

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a method, apparatus, heat pump unit, and storage medium for controlling a heat pump unit to improve the accuracy of humidity control in a drying oven.

[0009] In some embodiments, the heat pump unit includes: a unit casing with a first air outlet communicating with the external environment, a second air outlet communicating with the drying oven, and a return air outlet; the interior of the unit casing is divided into a first sub-chamber and a second sub-chamber; a condenser disposed in the first sub-chamber and corresponding to the second air outlet; an evaporator disposed in the second sub-chamber; the second sub-chamber having a fresh air inlet and a bypass vent; the fresh air inlet being provided with a fresh air valve, which, when opened, connects the second sub-chamber to the external environment; the bypass vent being provided with bypass ventilation. The valve, when opened, connects the second sub-chamber to the first sub-chamber; a dehumidification duct is provided inside the unit casing, the inlet of the dehumidification duct is connected to the drying oven, and a dehumidification valve is provided at the outlet of the dehumidification duct, which, when opened, connects the dehumidification duct to the external environment; the method includes: obtaining the evaporation temperature of the evaporator when the heat pump unit is operating for dehumidification; determining the target dehumidification mode of the heat pump unit based on the evaporation temperature; and controlling the on / off states of the dehumidification valve, the fresh air valve, and the bypass ventilation valve based on the target dehumidification mode.

[0010] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the aforementioned method for controlling a heat pump unit when the program instructions are executed.

[0011] In some embodiments, the heat pump unit includes: a heat pump unit body; and a device for controlling the heat pump unit as described above, which is installed on the heat pump unit body.

[0012] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling a heat pump unit.

[0013] The method, apparatus, heat pump unit, and storage medium for controlling a heat pump unit provided in this disclosure can achieve the following technical effects:

[0014] When the heat pump unit is operating for dehumidification, the evaporation temperature of the evaporator is acquired. This temperature determines the evaporator's dehumidification capacity, i.e., whether it can perform normal dehumidification. Based on the evaporation temperature, the target dehumidification mode of the heat pump unit is then determined to match the dehumidification mode with the evaporator's dehumidification capacity. Finally, the opening and closing of the exhaust air valve, fresh air valve, and bypass ventilation valve are controlled according to the target dehumidification mode to ensure the heat pump unit smoothly enters the target dehumidification mode. This ensures that the dehumidification mode operated by the heat pump unit is coordinated with the evaporator's dehumidification capacity, thereby improving the accuracy of the heat pump unit's humidity regulation in the drying room.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the heat pump unit provided in the embodiments of this disclosure;

[0018] Figure 2 This is a schematic diagram of a method for controlling a heat pump unit provided in an embodiment of this disclosure;

[0019] Figure 3 This is a schematic diagram of airflow after the air valve is opened in the heat pump unit provided in this embodiment of the disclosure;

[0020] Figure 4 This is a schematic diagram of another method for controlling a heat pump unit provided in an embodiment of this disclosure;

[0021] Figure 5 This is a schematic diagram of another method for controlling a heat pump unit provided in an embodiment of this disclosure;

[0022] Figure 6 This is a schematic diagram of a device for controlling a heat pump unit provided in an embodiment of this disclosure;

[0023] Figure 7 This is a schematic diagram of another device for controlling a heat pump unit provided in an embodiment of this disclosure;

[0024] Figure 8 This is a schematic diagram of a heat pump unit provided in an embodiment of this disclosure.

[0025] Figure label:

[0026] 1. Compressor; 2. Condenser; 3. First heat exchanger; 4. Gas-liquid separator; 5. First on / off valve; 6. Second on / off valve; 7. Branch pipeline; 8. Third on / off valve; 9. Check valve; 10. First throttle valve; 11. First filter; 12. First drip tray; 13. Second heat exchanger (evaporator); 14. Second filter; 15. Second throttle valve; 16. Second drip tray; 17. First fan; 18. Second fan; 19. Electric auxiliary heating assembly; 20. Unit casing; 21. ... 21. First chamber; 22. Second chamber; 23. Third chamber; 231. First sub-chamber; 232. Second sub-chamber; 24. First air outlet; 25. Second air outlet; 26. Return air outlet; 27. First partition; 28. Third heat exchanger; 281. First air inlet side; 282. First air outlet side; 283. Second air inlet side; 284. Second air outlet side; 29. ​​Second partition; 30. Fresh air valve; 31. Bypass ventilation valve; 32. Exhaust duct; 33. Exhaust valve; 34. Temperature sensor. Detailed Implementation

[0027] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0028] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

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

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

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

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

[0033] Combination Figure 1 As shown in the figure, this disclosure provides a heat pump unit. The unit includes a unit casing 20, a first refrigerant circulation loop, a second refrigerant circulation loop, and a third refrigerant circulation loop. The first, second, and third refrigerant circulation loops are all located inside the unit casing 20. This allows for an integrated unit layout, ready for immediate use, and convenient and quick installation. Optionally, the heat pump unit is an air source heat pump unit.

[0034] The first refrigerant circulation loop includes: a compressor 1, a condenser 2, a first heat exchanger 3, and a gas-liquid separator 4, connected in sequence. A first on / off valve 5 is installed on the pipeline between the compressor 1 and the condenser 2. A second on / off valve 6 is installed on the pipeline between the first heat exchanger 3 and the gas-liquid separator 4. The outlet of the compressor 1 is connected to the pipeline between the first heat exchanger 3 and the gas-liquid separator 4 via a branch pipeline 7. The branching point of the branch pipeline 7 is located between the outlet of the compressor 1 and the first on / off valve 5. The connection point of the branch pipeline 7 is located between the first heat exchanger 3 and the second on / off valve 6. A third on / off valve 8 is installed on the branch pipeline 7. On the pipeline between the condenser 2 and the first heat exchanger 3, and along the direction of refrigerant flow from the condenser 2 to the first heat exchanger 3, a one-way valve 9, a first throttle valve 10, and a first filter 11 are installed in sequence. A first drip tray 12 is installed below the first heat exchanger 3.

[0035] The interior of the unit casing 20 is divided into a first chamber 21, a second chamber 22, and a third chamber 23 that are not interconnected.

[0036] A first air outlet 24 is provided on the wall of the unit casing 20, corresponding to the position of the first chamber 21. The first air outlet 24 is connected to the external environment. A first fan 17 and a first heat exchanger 3 are disposed inside the first chamber 21. The first fan 17 is disposed corresponding to the first air outlet 24. The first heat exchanger 3 is disposed on one side of the first fan 17. Heat exchange between the unit and the outside air of the drying oven is achieved through the first fan 17 and the first heat exchanger 3.

[0037] The compressor 1 and the gas-liquid separator 4 are located in the second chamber 22.

[0038] The second refrigerant circulation loop includes a compressor 1, a condenser 2, a second heat exchanger 13, and a gas-liquid separator 4, connected in sequence. A second filter 14 and a second throttle valve 15 are sequentially installed on the pipeline between the condenser 2 and the second heat exchanger 13, along the direction of refrigerant flow from the condenser 2 to the second heat exchanger 13. Simultaneously, a one-way valve 9 is installed upstream of the second filter 14 along the direction of refrigerant flow from the condenser 2 to the second heat exchanger 13. The one-way valve 9 is used to limit the flow of refrigerant from the condenser 2 to the first heat exchanger 3, and / or from the condenser 2 to the second heat exchanger 13. A second drip tray 16 is installed below the second heat exchanger 13.

[0039] The unit casing 20 has a second air outlet 25 and a return air outlet 26 on its wall. Both the second air outlet 25 and the return air outlet 26 are connected to the first sub-chamber 231. The second air outlet 25 is located on the top wall of the unit casing 20.

[0040] The second fan 18 corresponds to the second air outlet 25. The condenser 2 is located on the air inlet side of the second fan 18.

[0041] The unit also includes an electric auxiliary heating assembly 19. The electric auxiliary heating assembly 19 is located between the second fan 18 and the condenser 2. The electric auxiliary heating assembly 19 serves as a backup heat source for the unit and operates when the unit malfunctions or when the outdoor ambient temperature is too low, resulting in insufficient heating from the unit.

[0042] A first partition 27 is provided in the third chamber 23, dividing the third chamber 23 into a first sub-chamber 231 and a second sub-chamber 232 that are interconnected. A second fan 18, a condenser 2, and an electric auxiliary heating assembly 19 are disposed in the first sub-chamber 231. A second heat exchanger 13 is disposed in the second sub-chamber 232. The second heat exchanger 13 is an evaporator.

[0043] The unit also includes a third heat exchanger 28. The third heat exchanger 28 is located at the connection between the first sub-chamber 231 and the second sub-chamber 232, allowing air circulation between them. The third heat exchanger 28 is an air-to-air heat exchanger. The third heat exchanger 28 has a first air inlet side 281, a first air outlet side 282, a second air inlet side 283, and a second air outlet side 284. The first air inlet side 281 and the second air outlet side 284 are both located within the first sub-chamber 231, and the first air outlet side 282 and the second air inlet side 283 are both located within the second sub-chamber 232.

[0044] The second heat exchanger 13 is correspondingly arranged with the third heat exchanger 28, and corresponds to the first air outlet side 282 and the second air inlet side 283. The side of the second heat exchanger 13 facing the third heat exchanger 28 is connected to the first end of the second partition 29. The position between the first air outlet side 282 and the second air inlet side 283 is connected to the second end of the second partition 29. In this way, the second partition 29 separates the first air outlet side 282 and the second air inlet side 283. Specifically, the first air outlet side 282 corresponds to the upper portion of the side of the second heat exchanger 13 facing the third heat exchanger 28. The top of the second heat exchanger 13 is connected to the first partition 27 so that the upper portion of the side of the second heat exchanger 13 facing the third heat exchanger 28 is in the same space as the first air outlet side 282. The second air inlet side 283 corresponds to the lower portion of the side of the second heat exchanger 13 facing the third heat exchanger 28, so that the lower portion of the side of the second heat exchanger 13 facing the third heat exchanger 28 is in the same space as the second air inlet side 283. The return air outlet 26 is located close to the first air inlet side 281.

[0045] The first air inlet side 281 and the first air outlet side 282 form a first air duct, and the second air inlet side 283 and the second air outlet side 284 form a second air duct. Air entering the first sub-chamber 231 from the return air inlet 26 passes through the first air duct into the second heat exchanger 13 for dehumidification. The dehumidified air then passes through the second air duct and the condenser 2, while the remaining air passes directly through the condenser 2. After passing through the condenser 2, the air enters the interior of the drying chamber through the second fan 18 and the second air outlet 25.

[0046] The third refrigerant circulation loop includes: compressor 1, first heat exchanger 3, second heat exchanger 13 and gas-liquid separator 4 connected in sequence.

[0047] As can be seen from the structure above the unit, the unit has a closed design, with no outside air being introduced into the baking room, which avoids contamination of the dried materials and improves the baking quality.

[0048] The controller is also communicatively connected to the first on / off valve 5, the second on / off valve 6, the third on / off valve 8, the first throttle valve 10, and the second throttle valve 15 to control the opening and closing of each valve and the degree of opening when it is open. The controller is also communicatively connected to the compressor 1, the first fan 17, and the second fan 18 to control the starting and stopping of the compressor 1, the first fan 17, and the second fan 18.

[0049] Optionally, the first on / off valve 5, the second on / off valve 6, and the third on / off valve 8 are all solenoid valves. The first throttle valve 10 and the second throttle valve 15 are both electronic expansion valves.

[0050] The second sub-chamber 232 has a fresh air inlet and a bypass vent. The fresh air inlet corresponds to the first chamber 21. A fresh air valve 30 is installed at the fresh air inlet. When the fresh air valve 30 is open, the second sub-chamber 232 can be connected to the first chamber 21, thereby connecting to the external environment. The bypass vent corresponds to the first sub-chamber 231. A bypass vent valve 31 is installed at the bypass vent. When the bypass vent valve 31 is open, the second sub-chamber 232 can be connected to the first sub-chamber 231. The interior of the first sub-chamber 231 is also constructed with a dehumidification duct 32. The inlet of the dehumidification duct 32 is connected to the drying oven and is located below the return air inlet 26. Thus, when the second fan 18 is running, the air in the drying oven enters the unit from the return air inlet 26 and also enters the dehumidification duct 32. A dehumidification valve 33 is installed at the outlet of the dehumidification duct 32. When the dehumidification valve 33 is opened, the dehumidification duct 32 can be connected to the external environment.

[0051] The controller is also communicatively connected to the fresh air valve 30, the bypass ventilation valve 31, and the exhaust air valve 33 to control the opening and closing of the fresh air valve 30, the bypass ventilation valve 31, and the exhaust air valve 33.

[0052] Combination Figure 2 As shown, this disclosure provides a method for controlling a heat pump unit, including:

[0053] S201, the controller obtains the evaporation temperature of the evaporator when the heat pump unit is operating in dehumidification mode.

[0054] S202, the controller determines the target dehumidification mode of the heat pump unit based on the evaporation temperature.

[0055] S203, the controller controls the on / off state of the exhaust air valve, fresh air valve and bypass air valve according to the target dehumidification mode.

[0056] The drying oven is equipped with dry-bulb and wet-bulb temperature sensors. The controller of the heat pump unit communicates with these sensors to obtain the dry-bulb temperature Tg and wet-bulb temperature Ts within the drying oven. A temperature sensor is also installed in the external environment of the drying oven. The controller communicates with this sensor to obtain the outdoor ambient temperature Ta. After the drying oven starts operating, the controller determines whether the heat pump unit (hereinafter referred to as the "unit") needs to operate for dehumidification based on the dry-bulb and wet-bulb temperatures within the oven.

[0057] The operating modes of the unit include:

[0058] The first combination mode is: external heat absorption mode and internal heating mode.

[0059] The second combination mode includes external heat absorption mode, internal heating mode, and internal heat absorption mode.

[0060] The third combination mode: internal heat absorption mode and external heat dissipation mode.

[0061] The fourth combination mode: internal heat absorption mode and internal heating mode.

[0062] Set an outdoor ambient temperature threshold Ta', a first dry-bulb temperature threshold Tg', a second dry-bulb temperature threshold Tg'", and a first wet-bulb temperature threshold Ts'. Compare the values ​​of Tg with Tg', Tg'', Ts with Ts', and Ta with Ta'.

[0063] Optionally, Tg' = Tgs - ΔTg, Tg” = Tgs + ΔTg, and Ts' = Tss + ΔTs. Wherein, Tgs is the target dry-bulb temperature set by the user according to the different drying processes of the material; ΔTg is the preset dry-bulb temperature control hysteresis; Tss is the target wet-bulb temperature set by the user according to the different drying processes of the material; and ΔTs is the preset wet-bulb temperature control hysteresis.

[0064] If Ta ≥ Ta', Tg ≤ Tg', and Ts ≤ Ts', then the operating mode is the first combination mode. Specifically, the first and second on-off valves are opened, the third on-off valve is closed, the second throttle valve is at 0 (i.e., the second throttle valve is closed), and the first throttle valve is open. This allows the refrigerant to flow in the first refrigerant circulation loop and along the direction of the compressor, condenser, first heat exchanger, and gas-liquid separator. Simultaneously, the first and second fans are turned on.

[0065] If Ta ≥ Ta', Tg ≤ Tg', and Ts > Ts', then the operating mode is the second combined mode. Specifically, the first and second on-off valves are opened, the third on-off valve is closed, the second and first throttle valves are opened, and simultaneously, the first and second fans are turned on. This causes the refrigerant to flow in the first refrigerant circulation loop along the direction of the compressor, condenser, first heat exchanger, and gas-liquid separator, and in the second refrigerant circulation loop along the direction of the compressor, condenser, second heat exchanger, and gas-liquid separator.

[0066] If Tg > Tg" and Ts > Ts', the operating mode is the third combination mode. Specifically, the first and second on-off valves are closed, the third on-off valve is opened, the second and first throttle valves are opened, and the first and second fans are turned on simultaneously. This causes the refrigerant to flow in the third refrigerant circulation loop along the direction of the compressor, the first heat exchanger, the second heat exchanger, and the gas-liquid separator.

[0067] If Ta < Ta', Tg ≤ Tg' and Ts > Ts', the operation mode is the fourth combined mode. Specifically, control the first on-off valve to open, the second and third on-off valves to close, open the second throttle valve, and close the first throttle valve. At the same time, control the first fan to close and the second fan to open. Thus, the refrigerant flows in the second refrigerant circulation loop and along the directions of the compressor, condenser, second heat exchanger, and gas-liquid separator.

[0068] In the above various situations, as long as Ts > Ts', dehumidification is required. When the unit operates in the corresponding mode, the refrigerant flows through the second heat exchanger, thereby dehumidifying the air. At this time, the unit operates for dehumidification.

[0069] The controller is also communicatively connected to the temperature sensor 34 provided on the evaporator. After the unit operates for the first preset duration t1 for dehumidification, the controller obtains the evaporation temperature Te of the evaporator through the temperature sensor 34. The evaporation temperature can characterize the dehumidification ability of the evaporator. Determine the target dehumidification mode of the unit according to the evaporation temperature, so that the dehumidification mode in which the unit operates can cooperate with the dehumidification ability of the evaporator. Then, according to the target dehumidification mode, control the opening or closing of the exhaust air valve, fresh air valve, and bypass air valve.

[0070] In the embodiments of the present disclosure, when the unit operates for dehumidification, obtain the evaporation temperature of the evaporator. The dehumidification ability of the evaporator can be judged through the evaporation temperature, that is, whether the evaporator can perform normal dehumidification. Then, based on the evaporation temperature, determine the target dehumidification mode of the unit so that the dehumidification mode matches the dehumidification ability of the evaporator. Finally, control the opening and closing of the exhaust air valve, fresh air valve, and bypass air valve according to the target dehumidification mode, so that the unit can smoothly enter the target dehumidification mode. In this way, the dehumidification mode in which the unit operates can cooperate with the dehumidification ability of the evaporator, thereby improving the regulation accuracy of the humidity of the baking room by the unit.

[0071] Optionally, in step S202, the controller determines the target dehumidification mode of the heat pump unit according to the evaporation temperature, including:

[0072] The controller determines the dew point temperature of the air in the baking room.

[0073] The controller calculates the temperature difference between the evaporation temperature and the dew point temperature.

[0074] The controller determines the target dehumidification mode of the heat pump unit according to the temperature difference.

[0075] Determine the dew point temperature T1 of the air in the baking room. Calculate the temperature difference ΔT' between the dew point temperature and the evaporation temperature, ΔT' = T1 - Te. Determine the target dehumidification mode of the unit according to the temperature difference ΔT'.

[0076] If the temperature difference is greater than or equal to the first temperature threshold, it indicates that the evaporator's dehumidification effect is within the preset target range, meaning that using the evaporator alone can meet the humidity control requirements of the drying room. Therefore, the target dehumidification mode is determined to be the closed-loop dehumidification mode. The closed-loop dehumidification mode is a mode that relies solely on the evaporator for dehumidification.

[0077] If the temperature difference is less than the first temperature threshold but greater than or equal to the second temperature threshold, it indicates that as the oven temperature rises, the evaporator's dehumidification effect is gradually deviating from its optimal operating range and deteriorating. In this case, in addition to relying on the evaporator for dehumidification, it is necessary to also allow air exchange between the oven and the external environment. This air exchange includes introducing dry fresh air from outside and exhausting humid air from inside the oven to improve the dehumidification effect. Therefore, the target dehumidification mode is determined to be a hybrid dehumidification mode.

[0078] If the temperature difference is less than the second temperature threshold, it indicates that the material has entered the later stage of drying, such as the drying stage of tobacco leaves where the temperature in the drying room exceeds 60℃. At this point, the evaporator can no longer reach the return air dew point temperature and cannot perform dehumidification. Therefore, the target dehumidification mode is determined to be the open dehumidification mode. The open dehumidification mode is a mode that does not rely on the evaporator for dehumidification.

[0079] Optionally, the first temperature threshold is a positive value, and the second temperature threshold is zero.

[0080] In this way, based on the temperature difference between the dew point temperature and the evaporation temperature, it is determined whether the evaporator's dehumidification capacity can operate normally. Then, based on the temperature difference, the target dehumidification mode of the unit is determined, so that the target dehumidification mode of the unit matches the dehumidification capacity of the evaporator, thereby improving the accuracy of the unit's humidity regulation in the drying room.

[0081] Optionally, the controller determines the dew point temperature of the air inside the drying oven, including:

[0082] The controller acquires the dry-bulb and wet-bulb temperatures of the air inside the drying oven.

[0083] The controller determines the dew point temperature based on the dry-bulb and wet-bulb temperatures.

[0084] The dry-bulb and wet-bulb temperatures of the air inside the drying oven are obtained using dry-bulb and wet-bulb temperature sensors. The dew point temperature is then determined based on these temperatures. Specifically, the dew point temperature can be determined using an enthalpy-humidity chart. The specific method is existing technology and will not be elaborated upon here.

[0085] Optionally, in step S203, the controller controls the on / off states of the exhaust air valve, fresh air valve, and bypass air valve according to the target dehumidification mode, including:

[0086] When the target dehumidification mode is closed dehumidification mode, the controller controls the exhaust air valve, fresh air valve and bypass ventilation valve to close.

[0087] When the target dehumidification mode is mixed dehumidification mode, the controller controls the opening of the exhaust air valve and the fresh air valve, and controls the closing of the bypass ventilation valve.

[0088] When the target dehumidification mode is open dehumidification mode, the controller controls the exhaust air valve, fresh air valve and bypass ventilation valve to open.

[0089] If the target dehumidification mode is closed-loop dehumidification, the exhaust air valve, fresh air valve, and bypass ventilation valve are closed, allowing the unit to dehumidify solely using the evaporator. If the target dehumidification mode is mixed dehumidification, the exhaust air valve and fresh air valve are opened, while the bypass ventilation valve is closed. This introduces some fresh air into the return air side of the evaporator, lowering the return air temperature and increasing the temperature difference, thus improving the dehumidification speed. If the target dehumidification mode is open-loop dehumidification, the exhaust air valve, fresh air valve, and bypass ventilation valve are opened. This allows fresh air to directly enter the first sub-chamber through the fresh air valve and bypass ventilation valve, thus entering the drying oven. Simultaneously, the high-humidity air inside the drying oven is discharged to the outside environment through the exhaust air valve. Figure 3 As shown. In this way, the opening and closing of the exhaust air valve, fresh air valve, and bypass air valve are controlled based on the target dehumidification mode, so that the opening and closing status of the air valves matches the dehumidification capacity of the evaporator, thereby improving the precise control of the air humidity in the drying room.

[0090] Combination Figure 4 As shown, this disclosure provides a method for controlling a heat pump unit, including:

[0091] S401, the controller obtains the evaporation temperature of the evaporator when the heat pump unit is operating in dehumidification mode.

[0092] S402, the controller determines the target dehumidification mode of the heat pump unit based on the evaporation temperature.

[0093] S403, the controller determines the current dew point temperature inside the drying room when the target operating mode is closed dehumidification mode or mixed dehumidification mode.

[0094] S404, the controller controls the compressor's operating frequency based on the evaporation temperature and the current dew point temperature.

[0095] S405, the controller controls the on / off status of the exhaust air valve, fresh air valve and bypass air valve according to the target dehumidification mode.

[0096] After determining the target dehumidification mode, if it is a closed-loop dehumidification mode or a hybrid dehumidification mode, the dew point temperature of the air in the drying room is determined according to the method described above. Then, the operating frequency of the compressor is controlled based on the evaporation temperature and the dew point temperature.

[0097] Optionally, the temperature difference ΔT” between the evaporation temperature and the dew point temperature is calculated, where ΔT” = Te - T1. Based on the correlation between the temperature range containing the temperature difference and the compressor frequency correction value, the frequency correction value corresponding to the current temperature difference is determined. When the temperature difference is in the first temperature range, the frequency correction value is the first correction value f1. When the temperature difference is in the second temperature range, the frequency correction value is the second correction value f2. When the temperature difference is in the third temperature range, the frequency correction value is the third correction value f3. Specifically, from the first temperature range to the third temperature range, the lower limit of the previous temperature range is greater than the upper limit of the next temperature range. The first correction value is greater than the second correction value, and the second correction value is greater than the third correction value. That is, the larger the temperature range containing the temperature difference, the larger the frequency correction value. Optionally, f1 = 1.1 * f0, f2 = f0, f3 = 0. Here, f0 is a preset frequency increment. The specific correlation between the temperature range containing the temperature difference and the compressor frequency correction value can be found in Table 1.

[0098] Table 1. Correlation between the temperature range containing the temperature difference and the compressor frequency correction value.

[0099] The temperature range where the temperature difference is located Compressor frequency correction value [ΔT1,+∞) 1.1*f0 [-ΔT1,ΔT1) f0 (-∞,-ΔT1) 0

[0100] In Table 1, ΔT1 represents the preset temperature difference. When the temperature difference is within the first and second temperature ranges, the compressor operating frequency is positively corrected, i.e., the compressor operating frequency is increased. If, during the process of increasing the compressor operating frequency, the temperature difference does not reach the third temperature range, the compressor operating frequency is continuously increased until it reaches the maximum permissible operating frequency f. max After the compressor has maintained its maximum permissible operating frequency for a preset duration t3, the corresponding air valve will be opened. If, during the process of increasing the compressor's operating frequency, the compressor frequency has not yet been increased to f... max If the temperature difference reaches the third temperature range, the compressor will be controlled to maintain its current operating frequency, and the corresponding air valve will be opened.

[0101] In this way, based on the temperature difference between the evaporator and the dew point temperature inside the drying oven, the compressor frequency is corrected to appropriately adjust the evaporator temperature. This allows for proper adjustment of the evaporator's dehumidification capacity. Then, the corresponding air valves are controlled to coordinate with the compressor frequency correction, improving the accuracy of humidity control within the drying oven.

[0102] It should be noted that since the evaporator cannot dehumidify in open dehumidification mode, adjusting the compressor frequency in open dehumidification mode cannot adjust the evaporator's evaporation temperature. Therefore, the above-mentioned compressor frequency control scheme is only applicable to closed dehumidification mode and hybrid dehumidification mode.

[0103] Combination Figure 5As shown, this disclosure provides a method for controlling a heat pump unit, including:

[0104] S401, the controller obtains the evaporation temperature of the evaporator when the heat pump unit is operating in dehumidification mode.

[0105] S402, the controller determines the target dehumidification mode of the heat pump unit based on the evaporation temperature.

[0106] S403, the controller determines the current dew point temperature inside the drying room when the target operating mode is closed dehumidification mode or mixed dehumidification mode.

[0107] S404, the controller controls the compressor's operating frequency based on the evaporation temperature and the current dew point temperature.

[0108] S405, the controller controls the on / off status of the exhaust air valve, fresh air valve and bypass air valve according to the target dehumidification mode.

[0109] S406, the controller determines the open air valve as the target air valve when the compressor's operating frequency is at the maximum permissible operating frequency and the dew point temperature and evaporation temperature are met.

[0110] S407, the controller adjusts the opening degree of the target air valve according to the operating frequency of the compressor.

[0111] After controlling the opening and closing of the exhaust valve, fresh air valve, and bypass valve, the compressor's operating frequency is obtained to determine the degree of frequency regulation. The open valves are identified as target valves. In closed-loop dehumidification mode, all valves are closed. In mixed dehumidification mode, the fresh air valve and exhaust valve are open. Therefore, the fresh air valve and exhaust valve are identified as target valves. Then, the opening degree of the target valves is adjusted according to the compressor's operating frequency. Since the target valves are the fresh air valve and exhaust valve in mixed dehumidification mode, the target valve opening adjustment scheme only applies to mixed dehumidification mode. Specifically, the compressor's operating frequency is obtained; if the operating frequency has already increased to its maximum value f... max If the system continues to operate for a third preset time t3, and the temperature difference remains less than the first temperature threshold but greater than or equal to the second temperature threshold, then the fresh air valve and exhaust valve will open, gradually increasing in preset increments. These preset increments can be 4° to 6°. After each increase in opening increment, the valves will maintain their current opening for a fourth preset time t4. This continues until the opening reaches the maximum of 90°, at which point the increase in opening of the fresh air valve and exhaust valve stops; alternatively, if the temperature difference between the dew point temperature and the evaporation temperature is greater than or equal to the first temperature threshold, the increase in opening of the fresh air valve and exhaust valve will cease, maintaining their current opening.

[0112] Optionally, set the second wet-bulb temperature threshold Ts”. Optionally, Ts” = Tss - ΔTs. Compare the magnitudes of Ts and Ts”. If Ts < Ts”, it indicates that the wet-bulb temperature in the baking room has reached the required range. At this time, control the unit to stop dehumidifying. Specifically, control the second throttle valve, the exhaust air valve, the fresh air valve, and the bypass air valve to close. The compressor and the first fan operate or stop according to the dry-bulb temperature requirement.

[0113] When the unit operates in the various combined modes described above, the controller controls the opening degrees of the first throttle valve and / or the second throttle valve according to the operating conditions of the heat pump unit when the first throttle valve and / or the second throttle valve is opened.

[0114] As can be seen from the foregoing, when controlling the unit to operate in the target operating mode, the corresponding refrigerant circulation circuit needs to remain connected. In order to keep the corresponding refrigerant circulation circuit connected, the corresponding on-off valve and throttle valve need to be opened. For the throttle valve, its opening degree is adjustable. Therefore, when the first throttle valve and / or the second throttle valve is opened, control the opening degrees of the first throttle valve and / or the second throttle valve according to the operating conditions of the unit, so that the unit can adjust the temperature and humidity in the baking room to meet the requirements.

[0115] Specifically, the operating conditions of the unit include: the target operating mode of the unit, the suction temperature of the compressor, and the evaporation temperature of the unit. If the target operating mode is the first combined mode, adjust the opening degree of the first throttle valve according to the suction superheat degree of the compressor and the evaporation temperature of the unit. If the target operating mode is the second combined mode, adjust the opening degrees of the first throttle valve and the second throttle valve according to the suction superheat degree of the compressor and the evaporation temperature of the unit. If the target operating mode is the third combined mode, control the first throttle valve to be fully open and adjust the opening degree of the second throttle valve according to the suction superheat degree of the compressor and the evaporation temperature of the unit. If the target operating mode is the fourth combined mode, control the first throttle valve to be fully closed and adjust the opening degree of the second throttle valve according to the suction superheat degree of the compressor and the evaporation temperature of the unit.

[0116] Optionally, the controller adjusts the opening degrees of the first throttle valve and / or the second throttle valve according to the suction superheat degree of the compressor and the evaporation temperature of the unit, including:

[0117] The controller determines the target throttle valve.

[0118] The controller controls the target throttle valve to maintain a preset reference opening degree within the first preset duration after the compressor starts.

[0119] The controller calculates the temperature difference between the suction temperature and the evaporation temperature.

[0120] After the first preset duration, the controller adjusts the opening degree of the target throttle valve according to the temperature difference.

[0121] The throttling valve whose opening needs adjustment is designated as the target throttling valve. For example, when operating the first combination mode, if the first throttling valve needs adjustment, then the first throttling valve is designated as the target throttling valve. Similarly, when operating the second combination mode, if the openings of the first and second throttling valves need adjustment, then both the first and second throttling valves are designated as target throttling valves. Within the first preset time t0 after compressor startup, the target throttling valve is maintained at a preset reference opening K0. The controller obtains the suction temperature Tx through a sensor located at the compressor suction port. Simultaneously, it obtains the unit's low-pressure pressure Ps through a low-pressure sensor. The controller converts the low-pressure pressure Ps into the corresponding evaporation temperature Tps. After the second preset time t2 (compressor startup time greater than t2), the temperature difference ΔT = Tx - Tps between the suction and evaporation temperatures is calculated. The opening of the target throttling valve is adjusted based on ΔT.

[0122] Optionally, the controller determines the opening adjustment speed corresponding to the current temperature difference value based on the correlation between the temperature range in which the temperature difference value is located and the opening adjustment speed. This correlation is stored in the controller and includes the correspondence between one or more temperature ranges in which the temperature difference value is located and the opening adjustment speed.

[0123] Specifically, if the temperature difference is within the first temperature range, the opening adjustment speed is the first speed. If the temperature difference is within the second temperature range, the opening adjustment speed is the second speed. If the temperature difference is within the third temperature range, the opening adjustment speed is the third speed. If the temperature difference is within the fourth temperature range, the opening adjustment speed is the fourth speed. If the temperature difference is within the fifth temperature range, the opening adjustment speed is the fifth speed. Among the first to fifth temperature ranges, the lower limit of the previous temperature range is greater than the upper limit of the next temperature range. The first to fifth speeds decrease sequentially. Optionally, the first and second speeds are positive values, the third speed is 0, and the fourth and fifth speeds are negative values.

[0124] Specifically, the relationship between the temperature range of the temperature difference value and the opening adjustment speed can be found in Table 2.

[0125] Table 2 shows the relationship between the temperature range of the temperature difference and the opening adjustment speed.

[0126] Temperature range (°C) within which the temperature difference value lies. Opening adjustment speed (steps / t5 s) ΔT≥4 +5 2≤ΔT<4 +3 0≤ΔT<2 0 (Maintain current opening level) -2≤ΔT<0 -3 ΔT<-2 -5

[0127] Optionally, every fifth preset time interval t5, Ts and Tps are detected and ΔT is calculated. This process continues until the opening is adjusted so that ΔT is within the third temperature range [0,2), maintaining the opening constant.

[0128] It should be noted that the adjustment of the opening of the first throttle valve and the second throttle valve should be carried out according to the above logic.

[0129] In this way, when the opening of the first and second throttle valves is automatically adjusted, the opening and speed of the throttle valves are adjusted according to the difference between the suction temperature and the evaporation temperature, so that the suction temperature and the evaporation temperature are not too different, thus ensuring the normal operation of the compressor.

[0130] Combination Figure 6 As shown, this embodiment of the disclosure provides an apparatus 60 for controlling a heat pump unit, including: an acquisition module 61, a determination module 62, and a control module 63. The acquisition module 61 is configured to acquire the evaporation temperature of the evaporator when the heat pump unit is operating in dehumidification mode. The determination module 62 is configured to determine a target dehumidification mode for the heat pump unit based on the evaporation temperature. The control module 63 is configured to control the on / off states of the exhaust air valve, the fresh air valve, and the bypass ventilation valve according to the target dehumidification mode.

[0131] The device for controlling a heat pump unit provided in this disclosure acquires the evaporation temperature of the evaporator during dehumidification operation. The evaporation temperature determines the evaporator's dehumidification capacity, i.e., whether the evaporator can perform normal dehumidification. Based on the evaporation temperature, a target dehumidification mode for the unit is determined to match the dehumidification mode with the evaporator's dehumidification capacity. Finally, the opening and closing of the exhaust air valve, fresh air valve, and bypass ventilation valve are controlled according to the target dehumidification mode to ensure the unit smoothly enters the target dehumidification mode. This allows the dehumidification mode operated by the unit to match the evaporator's dehumidification capacity, thereby improving the accuracy of the unit's humidity regulation in the drying oven.

[0132] Combination Figure 7 As shown, this disclosure provides an apparatus 70 for controlling a heat pump unit, including a processor 71 and a memory 72. Optionally, the apparatus may further include a communication interface 73 and a bus 74. The processor 71, communication interface 73, and memory 72 can communicate with each other via the bus 74. The communication interface 73 can be used for information transmission. The processor 71 can call logical instructions in the memory 72 to execute the method for controlling the heat pump unit described in the above embodiments.

[0133] Furthermore, the logic instructions in the aforementioned memory 72 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0134] The memory 72, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 71 executes functional applications and data processing by running the program instructions / modules stored in the memory 72, that is, it implements the method for controlling the heat pump unit in the above embodiments.

[0135] The memory 72 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 72 may include high-speed random access memory and may also include non-volatile memory.

[0136] Combination Figure 8 As shown, this disclosure provides a heat pump unit 80, including a heat pump unit body and the aforementioned device 60 (70) for controlling the heat pump unit. The device 60 (70) for controlling the heat pump unit is installed on the heat pump unit body. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the device 60 (70) for controlling the heat pump unit can be adapted to feasible product bodies to achieve other feasible embodiments.

[0137] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a heat pump unit.

[0138] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0139] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0140] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0141] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0142] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure 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.

[0143] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a heat pump unit, the heat pump unit comprising: The unit's outer casing has a first air outlet connected to the external environment, a second air outlet connected to the drying oven, and a return air outlet; the interior of the unit's outer casing is divided into a first sub-chamber and a second sub-chamber; a condenser is disposed in the first sub-chamber and corresponds to the second air outlet; an evaporator is disposed in the second sub-chamber; characterized in that... The second sub-chamber has a fresh air inlet and a bypass vent; The fresh air inlet is equipped with a fresh air valve, which can connect the second sub-chamber to the external environment when opened; the side ventilation outlet is equipped with a side ventilation valve, which can connect the second sub-chamber to the first sub-chamber when opened. The unit's outer casing is equipped with a dehumidification duct. The inlet of the dehumidification duct is connected to the drying room, and the outlet of the dehumidification duct is equipped with a dehumidification valve, which can connect the dehumidification duct to the external environment when opened. The method includes: When the heat pump unit is operating in dehumidification mode, the evaporation temperature of the evaporator is obtained; Based on the evaporation temperature, the target dehumidification mode of the heat pump unit is determined, including: determining the dew point temperature of the air in the drying room; calculating the temperature difference between the dew point temperature and the evaporation temperature; and determining the target dehumidification mode of the heat pump unit based on the temperature difference. According to the target dehumidification mode, the on / off states of the exhaust air valve, the fresh air valve, and the bypass ventilation valve are controlled. Specifically, when the temperature difference is less than a first temperature threshold and greater than or equal to a second temperature threshold, the target dehumidification mode of the heat pump unit is determined to be a mixed dehumidification mode. In this mode, the exhaust air valve and the fresh air valve are opened, and the bypass ventilation valve is closed, introducing some fresh air into the return air side of the evaporator to lower the return air temperature and increase the dehumidification speed. When the temperature difference is greater than or equal to the first temperature threshold, the target dehumidification mode of the heat pump unit is determined to be a closed dehumidification mode. In this mode, the exhaust air valve, the fresh air valve, and the bypass ventilation valve are closed. When the temperature difference is less than the second temperature threshold, the target dehumidification mode of the heat pump unit is determined to be an open dehumidification mode. In this mode, the exhaust air valve, the fresh air valve, and the bypass ventilation valve are opened. A closed dehumidification mode relies solely on the evaporator for dehumidification; an open dehumidification mode does not rely on the evaporator for dehumidification; and a mixed dehumidification mode combines evaporator-based dehumidification with air exchange between the drying room and the external environment for dehumidification.

2. The method according to claim 1, characterized in that, Determining the dew point temperature of the air inside the drying room includes: Obtain the dry-bulb and wet-bulb temperatures of the air inside the drying oven; Determine the dew point temperature based on the dry-bulb and wet-bulb temperatures.

3. The method according to claim 1, characterized in that, After determining that the target dehumidification mode of the heat pump unit is a closed-loop dehumidification mode or a hybrid dehumidification mode, and before controlling the on / off states of the exhaust valve, the fresh air valve, and the bypass ventilation valve according to the target dehumidification mode, the method further includes: Determine the current dew point temperature inside the drying room; The operating frequency of the compressor is controlled based on the evaporation temperature and the current dew point temperature.

4. The method according to claim 3, characterized in that, After controlling the on / off states of the exhaust valve, the fresh air valve, and the bypass ventilation valve according to the target dehumidification mode, the method further includes: When the compressor operates at its maximum permissible operating frequency and the temperature difference between the dew point temperature and the evaporation temperature is less than the first temperature threshold and greater than or equal to the second temperature threshold, the opened air valve is identified as the target air valve. Adjust the opening degree of the target air valve according to the operating frequency of the compressor.

5. A device for controlling a heat pump unit, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for controlling a heat pump unit as described in any one of claims 1 to 4.

6. A heat pump unit, characterized in that, include: Heat pump unit body; The device for controlling a heat pump unit as described in claim 5 is installed on the heat pump unit body.

7. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling the heat pump unit as described in any one of claims 1 to 4.

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