Air conditioner dehumidification power control method based on constant dew point temperature and air conditioner

Abstract

The application provides a constant dew point temperature-based air conditioner dehumidification power control method and air conditioner, and relates to the field of air conditioners, and comprises the following steps: determining a first dew point temperature difference between a first dew point temperature of a lithium battery workshop and a target dew point temperature, and adjusting a standard regeneration temperature of a rotary dehumidifier based on the first dew point temperature difference; when return air humidity of the air conditioner is greater than or equal to a preset humidity threshold, controlling the air conditioner to switch to a humidity closed-loop control mode, and reducing the regeneration temperature of the rotary dehumidifier to be lower than the standard regeneration temperature; determining a second dew point temperature of the lithium battery workshop in the humidity closed-loop control mode, and adjusting dehumidification power of the air conditioner based on a second dew point temperature difference between the second dew point temperature and the target dew point temperature. In the humidity closed-loop control mode, the dehumidification power of the air conditioner is dynamically adjusted according to the re-determined second dew point temperature difference, so that energy waste caused by excessive dehumidification is avoided on the premise of maintaining stability of the dew point temperature of the lithium battery workshop.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and in particular to an air conditioning dehumidification power control method and an air conditioner based on a constant dew point temperature. Background Technology

[0002] Lithium battery production workshops have extremely strict requirements for environmental temperature and humidity, especially in key areas such as the liquid injection room and drying room, where the dew point temperature needs to be controlled below -30°C, or even as low as -50°C.

[0003] In related technologies, air conditioning systems can handle high humidity air in workshops through heat and humidity coupling, but this often leads to low air conditioning efficiency and an inability to maintain a stable low dew point, making it difficult to meet the stringent requirements of lithium battery workshops for a constant dew point. Even if rotary dehumidification technology is used to maintain the workshop dew point at a low level, the regeneration heating energy consumption of the air conditioning system at this low dew point is still relatively high. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide an air conditioning dehumidification power control method and air conditioner based on constant dew point temperature, which solves the problem of high regeneration heating energy consumption in the air conditioning system of lithium battery production workshop at constant dew point temperature.

[0005] In a first aspect, this application provides an air conditioning dehumidification power control method based on a constant dew point temperature, applied to a lithium battery workshop equipped with an air conditioning system. The air conditioning system includes a pre-cooling module, a cryogenic module, and a regeneration module connected in sequence. The pre-cooling module is equipped with a chilled water coil for initial cooling and dehumidification. The cryogenic module is equipped with a variable frequency evaporator for further cooling to the target dew point temperature or below. The regeneration module is equipped with a rotary dehumidifier to cooperate with the waste heat recovery system of the lithium battery workshop for waste heat recovery. The method includes:

[0006] Determine the first dew point temperature difference between the first dew point temperature of the lithium battery workshop and the target dew point temperature, and adjust the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference;

[0007] When the return air humidity of the air conditioner is greater than or equal to the preset humidity threshold, the air conditioner is controlled to switch to the humidity closed-loop control mode, and the regeneration temperature of the rotary dehumidifier is reduced to below the standard regeneration temperature.

[0008] In the humidity closed-loop control mode, the second dew point temperature of the lithium battery workshop is determined, and the dehumidification power of the air conditioner is adjusted based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature.

[0009] In one embodiment, determining the first dew point temperature and / or the second dew point temperature of the lithium battery workshop specifically includes:

[0010] The dry-bulb temperature, wet-bulb temperature, and relative humidity values ​​at multiple measurement points within the lithium battery workshop are obtained, and the dew point temperature at each measurement point is calculated.

[0011] Based on the dew point temperature of each measurement point and the corresponding weighting coefficient, the first dew point temperature and / or the second dew point temperature of the lithium battery workshop are determined according to a preset weighted accumulation formula.

[0012] In one embodiment, adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference specifically includes:

[0013] Obtain the adjustment coefficient and reference regeneration temperature of the rotary dehumidifier, and determine the standard regeneration temperature based on the adjustment coefficient, the reference regeneration temperature, and the first dew point temperature difference; or

[0014] If the first dew point temperature difference is greater than a preset temperature difference threshold, then the adjustment coefficient, correction coefficient, and reference regeneration temperature of the rotary dehumidifier are obtained, and the standard regeneration temperature is determined based on the adjustment coefficient, the correction coefficient, the reference regeneration temperature, and the first dew point temperature difference.

[0015] In one embodiment, after controlling the air conditioner to switch to the humidity closed-loop control mode, the method further includes:

[0016] Control the regeneration energy consumption of the rotary dehumidifier to switch to standard regeneration energy consumption; and / or

[0017] Controlling the variable frequency evaporator to set a temperature less than or equal to the target dew point temperature; and / or

[0018] Increase the water flow rate of the cold water coil.

[0019] In one embodiment, a heat recovery bypass valve is provided between the rotary dehumidifier and the waste heat recovery system, and the waste heat recovery system is further provided with an electric auxiliary heater for electrically heating the waste heat; after adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference, the system further includes:

[0020] When the return air humidity of the air conditioner is less than the preset humidity threshold, the air conditioner is controlled to switch to the temperature closed-loop control mode.

[0021] In the temperature closed-loop control mode:

[0022] Adjust the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier; and / or

[0023] Adjust the opening degree of the heat recovery bypass valve.

[0024] In one embodiment, adjusting the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier specifically includes:

[0025] The total heat recovery amount of the waste heat recovery system is determined based on the frequency of the condenser fan of the waste heat recovery system.

[0026] The heat recovery amount of the rotary dehumidifier is determined based on the heat recovery rate of the rotary dehumidifier and the target dew point temperature.

[0027] Using the heat recovery amount of the rotary dehumidifier and the total heat recovery amount of the waste heat recovery system as inputs, the power of the electric auxiliary heater is determined according to a preset heat recovery function.

[0028] In one embodiment, the expression for the heat recovery function is:

[0029]

[0030] Among them, the The power of the electric auxiliary heater; The total heat recovery capacity of the waste heat recovery system is calculated using the following formula: The The operating frequency of the condenser fan, the The influence coefficient ranges from 0.5 to 1.2. This is the basic heat recovery capacity of the condenser fan; The heat recovery capacity of the rotary dehumidifier; The heat recovery efficiency of the rotary dehumidifier at the target dew point temperature is calculated using the following formula: The For the target dew point temperature, the The reference heat recovery coefficient has a value range of 0.8 ± 0.05. The temperature effect index has a value range of -0.05 ± 0.001. The heat recovery compensation coefficient has a value range of 0.1 ± 0.02; The heat conversion efficiency of the electric auxiliary heater is given.

[0031] In one embodiment, it further includes:

[0032] Obtain the operating frequency of the variable frequency evaporator;

[0033] When the operating frequency is less than or equal to the preset standard operating frequency, the electric auxiliary heater is controlled to stop heating, and the operating frequency of the variable frequency evaporator is gradually increased.

[0034] In one embodiment, adjusting the dehumidification power of the air conditioner based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature specifically includes:

[0035] When the second dew point temperature difference is greater than a preset first temperature difference threshold, the compressor frequency of the variable frequency evaporator is increased by a first frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is increased by a first adjustment opening degree; and / or

[0036] When the second dew point temperature difference is less than a preset second temperature difference threshold, the compressor frequency of the variable frequency evaporator is reduced by a second frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is reduced by a second adjustment opening degree; and / or

[0037] When the second dew point temperature difference is between the first temperature difference threshold and the second temperature difference threshold, the compressor frequency of the variable frequency evaporator is kept constant, and the opening degree of the electronic expansion valve of the variable frequency evaporator is kept constant.

[0038] In a second aspect, this application provides an air conditioner, including a processor and a memory; wherein the memory stores a computer program for being loaded by the processor and executing the air conditioner dehumidification power control method based on a constant dew point temperature as described in any one of the first aspects.

[0039] In the air conditioning dehumidification power control method and air conditioner based on constant dew point temperature in this embodiment, the standard regeneration temperature of the rotary dehumidifier is dynamically adjusted according to the first dew point temperature difference. When the return air humidity of the air conditioner is high, the air conditioner is controlled to switch to the humidity closed-loop control mode to reduce the regeneration temperature of the rotary dehumidifier to below the standard regeneration temperature. This avoids the regeneration temperature from remaining high, thereby directly reducing the use of electric auxiliary heating and thus reducing energy consumption. Then, in the humidity closed-loop control mode, the dehumidification power of the air conditioner is dynamically adjusted according to the newly determined second dew point temperature difference. Under the premise of maintaining a stable dew point temperature in the lithium battery workshop, energy waste caused by excessive dehumidification is avoided. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic flowchart of an air conditioning dehumidification power control method based on constant dew point temperature, provided as an embodiment of this application.

[0042] Figure 2 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application. Detailed Implementation

[0043] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0045] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, 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 limitations on the present invention.

[0046] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0047] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0048] The air conditioning system in this embodiment includes a pre-cooling module, a cryogenic module, and a regeneration module connected in sequence. The pre-cooling module is equipped with a chilled water coil, which lowers the dew point of the fresh air to about 9°C by introducing chilled water at approximately 7°C. The inlet pipe of the chilled water coil is equipped with an electric regulating valve, which can dynamically adjust the flow rate of the chilled water according to the first dew point temperature difference. The cryogenic module is equipped with a variable frequency evaporator that can lower the air dew point to below -30°C to meet the requirements of lithium battery processes. Its compressor frequency can be adjusted between 30-70Hz, achieving a cooling capacity of 60kW±20%. The regeneration module is equipped with a rotary dehumidifier, which can work with the waste heat recovery system of the lithium battery workshop to recover waste heat. The waste heat recovery system is equipped with a heat exchanger and an electric auxiliary heater. The heat exchanger can recover the 100°C process waste heat from the coating machine in the lithium battery workshop and preheat the regeneration air to 80°C. The electric auxiliary heater can supplement the heating to meet the heat required for the regeneration of the rotary dehumidifier.

[0049] like Figure 1 As shown, this embodiment provides an air conditioning dehumidification power control method based on constant dew point temperature, including:

[0050] Step S10: Determine the first dew point temperature difference between the first dew point temperature of the lithium battery workshop and the target dew point temperature, and adjust the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference;

[0051] Step S20: When the return air humidity of the air conditioner is greater than or equal to the preset humidity threshold, control the air conditioner to switch to the humidity closed-loop control mode and reduce the regeneration temperature of the rotary dehumidifier to below the standard regeneration temperature.

[0052] Step S30: Determine the second dew point temperature of the lithium battery workshop under the humidity closed-loop control mode, and adjust the dehumidification power of the air conditioner based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature.

[0053] In the air conditioning dehumidification power control method based on constant dew point temperature in this embodiment, the standard regeneration temperature of the rotary dehumidifier is dynamically adjusted according to the first dew point temperature difference. When the return air humidity of the air conditioner is high, the air conditioner is controlled to switch to the humidity closed-loop control mode to reduce the regeneration temperature of the rotary dehumidifier to below the standard regeneration temperature. This avoids the regeneration temperature from remaining high, thereby directly reducing the use of electric auxiliary heating and thus reducing energy consumption. Then, in the humidity closed-loop control mode, the dehumidification power of the air conditioner is dynamically adjusted according to the newly determined second dew point temperature difference. Under the premise of maintaining a stable dew point temperature in the lithium battery workshop, energy waste caused by excessive dehumidification is avoided.

[0054] Step S10: Determine the first dew point temperature difference between the first dew point temperature of the lithium battery workshop and the target dew point temperature, and adjust the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference.

[0055] The determination of the first dew point temperature of the lithium battery workshop specifically includes: acquiring the dry-bulb temperature, wet-bulb temperature, and relative humidity values ​​of multiple measurement points in the lithium battery workshop, calculating the dew point temperature of each measurement point respectively; and determining the first dew point temperature of the lithium battery workshop based on the dew point temperature of each measurement point and the corresponding weighting coefficient according to a preset weighted accumulation formula.

[0056] Temperature and humidity sensors are installed at multiple locations, including the inlet of the air conditioning fresh air duct, the outlet of the pre-cooling module, the inlet of the regeneration module, and the return air vent in the lithium battery workshop. These sensors can directly measure the dry-bulb temperature at each measurement point. wet-bulb temperature and relative humidity value When the relative humidity value is greater than 50%, it can be determined according to the formula. Determine the dew point temperature at each measurement point. When the relative humidity value When it is less than or equal to 50%, it can be calculated according to the formula. Determine the dew point temperature at each measurement point. .

[0057] If temperature and humidity sensors are installed at the inlet of the air conditioning fresh air duct, the outlet of the pre-cooling module, the inlet of the regeneration module, and the return air vent of the lithium battery workshop, forming four measurement points, the weighting coefficient of the fresh air duct inlet is 0.5. Since the fresh air duct inlet directly reflects the outdoor air condition and plays a decisive role in the subsequent dehumidification load, the pre-cooling module outlet reflects the pre-cooling effect and affects the cryogenic module load, its weighting coefficient is 0.15. The regeneration module inlet is used to assist in verifying the air condition before regeneration, and its weighting is relatively low, only 0.1. The actual humidity requirement of the workshop at the lithium battery workshop's return air vent is used for closed-loop control feedback, and its weighting is 0.25. Then, the first dew point temperature of the lithium battery workshop can be obtained by multiplying the temperature of each measurement point by the corresponding coefficient and summing them. It is understandable that the number of measurement points and the corresponding weighting coefficients can be adjusted according to actual needs.

[0058] By calculating the first dew point temperature difference, the standard regeneration temperature of the rotary dehumidifier can be dynamically adjusted. Compared with the fixed regeneration temperature used in traditional air conditioning systems, this directly reduces the energy consumption of electric auxiliary heating and achieves precise control of regeneration heating energy consumption from the source.

[0059] The step of adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference specifically includes: obtaining the adjustment coefficient and reference regeneration temperature of the rotary dehumidifier, and determining the standard regeneration temperature based on the adjustment coefficient, the reference regeneration temperature and the first dew point temperature difference;

[0060] When the dew point temperature fluctuation within the workshop is small, i.e., when the change in the first dew point temperature difference is not significant, the formula can be used. Calculate the standard regeneration temperature. (Among them...) Standard regeneration temperature, As the reference regeneration temperature, For adjustment coefficients, This represents the first dew point temperature difference. The reference regeneration temperature is also included. This refers to the minimum temperature required for the rotary dehumidifier to regenerate under standard operating conditions (inlet air dew point temperature of 0℃ and relative humidity of 50%). It is the base temperature to ensure effective desorption of moisture adsorbed in the silica gel material of the rotor, and its value is typically 85-95℃; adjustment coefficient. The sensitivity to changes in dew point is used to reflect the characteristics of the impeller material and its value ranges from 0.4 to 0.7.

[0061] In another embodiment, if the first dew point temperature difference is greater than a preset temperature difference threshold, the adjustment coefficient, correction coefficient, and reference regeneration temperature of the rotary dehumidifier are obtained, and the standard regeneration temperature is determined based on the adjustment coefficient, the correction coefficient, the reference regeneration temperature, and the first dew point temperature difference.

[0062] When the dew point temperature fluctuates significantly inside the workshop, such as during heavy summer rains, the formula can be used. Calculate the standard regeneration temperature. (Among them...) This is a correction factor that can compensate for the decrease in the regeneration efficiency of the rotor under high humidity load and avoid insufficient regeneration temperature caused by linear adjustment. Its value range is 1.1-1.3.

[0063] Step S20: When the return air humidity of the air conditioner is greater than or equal to the preset humidity threshold, control the air conditioner to switch to the humidity closed-loop control mode and reduce the regeneration temperature of the rotary dehumidifier to below the standard regeneration temperature.

[0064] The return air humidity of the air conditioner refers to the relative humidity value of the air returning from the lithium battery workshop to the air conditioning unit in the air conditioning system. It is used to determine whether the current humidity in the workshop exceeds the process requirements (such as the relative humidity requirement of ≤20% in the lithium battery electrolyte filling room). The return air humidity of the air conditioner can be collected in real time by a capacitive humidity sensor installed on the return air duct.

[0065] When the return air humidity is greater than or equal to the humidity threshold, it indicates that the humidity load in the lithium battery workshop is high. At this time, it is necessary to reduce the regeneration temperature of the rotor, reduce the input of electric auxiliary heating while ensuring the dehumidification effect, and control the air conditioner to switch to humidity closed-loop control mode.

[0066] After controlling the air conditioner to switch to the humidity closed-loop control mode, the method further includes: controlling the regeneration energy consumption of the rotary dehumidifier to switch to the standard regeneration energy consumption; and / or controlling the set adjustment temperature of the variable frequency evaporator to be less than or equal to the target dew point temperature; and / or increasing the water flow rate of the chilled water coil.

[0067] The standard regeneration energy consumption is the optimal energy consumption value pre-calibrated based on the target dew point temperature and the current humidity load. After switching, it can avoid excess or insufficient regeneration energy under high humidity conditions. By calculating the heat required for regeneration in real time, the power of the electric auxiliary heater is maintained at the standard value, avoiding the frequent switching of full power on and off in traditional systems, and reducing current surges.

[0068] By setting the regulating temperature of the variable frequency evaporator at or below the target dew point, it can be ensured that the dew point of the air meets the standard after deep cooling. By lowering the regulating temperature of the variable frequency evaporator, the problem of surface frost caused by excessively low surface temperature of the variable frequency evaporator can be avoided.

[0069] By increasing the water flow rate of the chilled water coil, the fresh air is initially cooled and dehumidified to the dew point temperature, which can handle most of the sensible heat load, reduce the burden on the subsequent cryogenic modules, shorten the response time to sudden humidity changes, and is suitable for rapid switching of working conditions in lithium battery workshops.

[0070] When the humidity in the lithium battery workshop is low, the dehumidification load of the air conditioner is low, and it can be switched to the temperature closed-loop control mode to further maintain the stability of the dew point temperature in the workshop.

[0071] A heat recovery bypass valve is provided between the rotary dehumidifier and the waste heat recovery system. The waste heat recovery system is also provided with an electric auxiliary heater for electrically heating waste heat. After adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference, the system further includes: when the return air humidity of the air conditioner is less than a preset humidity threshold, controlling the air conditioner to switch to a temperature closed-loop control mode; in the temperature closed-loop control mode: adjusting the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier; and / or adjusting the opening degree of the heat recovery bypass valve.

[0072] When the return air humidity is less than 20%, the air conditioning system automatically switches to closed-loop temperature control. At this time, the moisture load is low. By using the regeneration exhaust air temperature as the control variable, the heat recovery amount and electric auxiliary heating power are adjusted to ensure the regeneration efficiency of the rotary dehumidifier, which can indirectly maintain the stability of the dew point temperature.

[0073] Adjusting the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier specifically includes: determining the total heat recovery amount of the waste heat recovery system based on the frequency of the condenser fan; determining the heat recovery amount of the rotary dehumidifier based on the heat recovery rate of the rotary dehumidifier and the target dew point temperature; and determining the power of the electric auxiliary heater according to a preset heat recovery function, using the heat recovery amount of the rotary dehumidifier and the total heat recovery amount of the waste heat recovery system as inputs.

[0074] The condenser fan is installed on the exhaust duct of the waste heat recovery system. It accelerates waste heat discharge and simultaneously recovers heat through forced convection; the higher the frequency, the greater the waste heat exhaust volume. The frequency of the condenser fan can be measured in real time using a frequency converter, and calculated according to the formula... Calculate the total heat recovery amount of the waste heat recovery system, wherein the... The total heat recovery amount of the waste heat recovery system, the The operating frequency of the condenser fan, the The influence coefficient ranges from 0.5 to 1.2. This is the basic heat recovery capacity of the condenser fan.

[0075] The heat recovery rate of a rotary dehumidifier refers to the efficiency with which the dehumidifier recovers waste heat at a target dew point temperature, which can be expressed by the formula... Determined, wherein The heat recovery efficiency of the rotary dehumidifier at the target dew point temperature is... For the target dew point temperature, the The reference heat recovery coefficient has a value range of 0.8 ± 0.05. The temperature effect index has a value range of -0.05 ± 0.001. This is the heat recovery compensation coefficient, and its value ranges from 0.1 to 0.02.

[0076] The expression for the heat recovery function is:

[0077]

[0078] Among them, the The power of the electric auxiliary heater; The total heat recovery amount of the waste heat recovery system; The heat recovery capacity of the rotary dehumidifier; The heat recovery efficiency of the rotary dehumidifier at the target dew point temperature; The heat conversion efficiency of the electric auxiliary heater is given.

[0079] The heat recovery bypass valve is used to regulate the waste heat flow rate of the waste heat recovery system. When the air conditioner switches to closed-loop temperature control mode, precise control of the heat recovery amount is necessary to maintain a stable dew point temperature. If the bypass valve opening decreases, the waste heat flow rate through the heat recovery system increases, leading to increased heat recovery by the rotary dehumidifier. This may cause the regeneration temperature to rise, affecting the dehumidification effect and dew point temperature. Conversely, if the bypass valve opening increases, some waste heat can bypass the heat recovery system and be directly discharged, reducing the heat recovery amount and preventing excessively high regeneration temperatures that could cause dew point temperature fluctuations. Furthermore, the waste heat recovery system, together with the electric auxiliary heater, undertakes the task of heat supplementation. When the heat recovery amount is insufficient, the power of the electric auxiliary heater can be increased to compensate for the heat and maintain the target dew point temperature. When the heat recovery amount is sufficient, the power of the electric auxiliary heater can be reduced to lower the energy consumption of the air conditioning system.

[0080] In one embodiment, the method further includes: acquiring the operating frequency of the variable frequency evaporator; when the operating frequency is less than or equal to a preset standard operating frequency, controlling the electric auxiliary heater to stop heating, and gradually increasing the operating frequency of the variable frequency evaporator.

[0081] The higher the operating frequency of the variable frequency evaporator, the stronger its cooling and dehumidification capabilities. When its operating frequency is less than or equal to the standard operating frequency, it indicates that the current cooling or dehumidification demand is low and the cooling capacity of the air conditioning system itself may be sufficient. If the electric auxiliary heater continues to work at this time, it will cause the return air temperature of the air conditioner to be too high, which will lead to the variable frequency evaporator consuming additional energy.

[0082] After the electric auxiliary heater is stopped, the operating frequency of the variable frequency evaporator can be gradually increased by 5 Hz each time to gradually enhance its cooling and dehumidification capabilities, avoid sudden changes in cooling capacity that could cause a sharp drop in dew point temperature, and ensure the stability of the dew point temperature in the workshop.

[0083] Step S30: Determine the second dew point temperature of the lithium battery workshop under the humidity closed-loop control mode, and adjust the dehumidification power of the air conditioner based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature.

[0084] The second dew point temperature is a temperature that is redefined under the humidity closed-loop control mode. The calculation method for the first dew point temperature can be used to determine the second dew point temperature, which will not be elaborated here.

[0085] The method of adjusting the dehumidification power of the air conditioner based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature specifically includes:

[0086] When the second dew point temperature difference is greater than a preset first temperature difference threshold, the compressor frequency of the variable frequency evaporator is increased by a first frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is increased by a first adjustment opening degree; and / or

[0087] When the second dew point temperature difference is less than a preset second temperature difference threshold, the compressor frequency of the variable frequency evaporator is reduced by a second frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is reduced by a second adjustment opening degree; and / or

[0088] When the second dew point temperature difference is between the first temperature difference threshold and the second temperature difference threshold, the compressor frequency of the variable frequency evaporator is kept constant, and the opening degree of the electronic expansion valve of the variable frequency evaporator is kept constant.

[0089] When the second dew point temperature difference is greater than the preset first temperature difference threshold, it indicates that the humidity in the workshop is too high. The compressor frequency of the variable frequency evaporator can be gradually increased using the first frequency setting, and the opening of the electronic expansion valve can be gradually increased using the first adjustment setting, thereby enhancing the cooling and dehumidification intensity of the variable frequency evaporator. Conversely, when the second dew point temperature difference is less than the preset first temperature difference threshold, it indicates that the humidity in the workshop is too low. The compressor frequency of the variable frequency evaporator can be gradually decreased using the second frequency setting, and the opening of the electronic expansion valve can be gradually decreased using the second adjustment setting, thereby reducing the cooling and dehumidification intensity of the variable frequency evaporator. When the second dew point temperature difference is between the first and second temperature difference thresholds, the humidity in the workshop is suitable, and no further adjustment is needed; simply maintain the compressor frequency and the opening of the electronic expansion valve unchanged.

[0090] Since cooling capacity and dehumidification capacity are positively correlated, simply increasing the compressor frequency can easily lead to excessively low temperatures and frosting of the inverter evaporator. By coordinating the opening of the electronic expansion valve and the compressor frequency, this problem can be avoided, while simultaneously reducing the energy consumption of the inverter evaporator. Furthermore, because lithium battery workshops have strict requirements for dew point temperature, excessive dehumidification can cause the compressor to operate at high load, resulting in a surge in energy consumption. Through staged adjustment, the dehumidification power can be maintained at a suitable level while ensuring a stable dew point.

[0091] In summary, in the air conditioning dehumidification power control method based on constant dew point temperature in this embodiment, on the one hand, the standard regeneration temperature of the rotary dehumidifier is dynamically adjusted according to the first dew point temperature difference. When the return air humidity of the air conditioner is high, the air conditioner is controlled to switch to humidity closed-loop control mode to reduce the regeneration temperature of the rotary dehumidifier to below the standard regeneration temperature. This avoids maintaining a high regeneration temperature, directly reducing the use of electric auxiliary heating and thus reducing energy consumption. On the other hand, by coordinating the opening of the electronic expansion valve and the compressor frequency, the inverter evaporator temperature can be prevented from being too low, leading to frosting, while also reducing the energy consumption of the inverter evaporator. Furthermore, since lithium battery workshops have strict requirements for dew point temperature, excessive dehumidification will cause the compressor to operate at a high load, resulting in a surge in energy consumption. Through graded adjustment, the dehumidification power can be maintained at a suitable level while ensuring dew point stability.

[0092] Based on the same inventive concept as the above embodiments, this embodiment also provides an air conditioner, including a processor and a memory; wherein, the memory stores a computer program, the computer program being loaded by the processor and executed as described above, an air conditioner dehumidification power control method based on a constant dew point temperature.

[0093] like Figure 2 As shown, based on the same inventive concept as the above embodiments, this embodiment also provides a computer-readable storage medium storing instructions for being loaded by a processor and executed as described above, an air conditioning dehumidification power control method based on a constant dew point temperature.

[0094] The embodiments of the mobile terminal and computer-readable storage medium provided in this application include all the technical features of the embodiments of the above control method. The extended and explanatory content of the specification is basically the same as that of the embodiments of the above method, and will not be repeated here.

[0095] This application also provides a computer program product, which includes computer program code. When the computer program code is run on a computer, it causes the computer to perform the methods described in the various possible implementations above.

[0096] This application also provides a chip, including a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device with the chip installed performs the methods described in the various possible implementations above.

[0097] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0098] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.

[0099] In this application, the descriptions of the various embodiments have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0100] The technical features of the present application can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0101] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in the above-mentioned storage medium and includes several instructions to cause a terminal device to execute the methods of each embodiment of this application. The above are only preferred embodiments of this application and do not limit the patent scope of this application. All equivalent structural or equivalent procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application. It should be noted that 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 mutually.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for controlling the dehumidification power of an air conditioner based on a constant dew point temperature, characterized in that, This method is applied to a lithium battery workshop equipped with an air conditioning system. The air conditioning system includes a pre-cooling module, a cryogenic module, and a regeneration module connected in sequence. The pre-cooling module is equipped with a chilled water coil for initial cooling and dehumidification. The cryogenic module is equipped with a variable frequency evaporator for further cooling to the target dew point temperature or below. The regeneration module is equipped with a rotary dehumidifier to cooperate with the waste heat recovery system of the lithium battery workshop for waste heat recovery. The method includes: Determine the first dew point temperature difference between the first dew point temperature of the lithium battery workshop and the target dew point temperature, and adjust the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference; When the return air humidity of the air conditioner is greater than or equal to the preset humidity threshold, the air conditioner is controlled to switch to the humidity closed-loop control mode, and the regeneration temperature of the rotary dehumidifier is reduced to below the standard regeneration temperature. In the humidity closed-loop control mode, the second dew point temperature of the lithium battery workshop is determined, and the dehumidification power of the air conditioner is adjusted based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature. A heat recovery bypass valve is provided between the rotary dehumidifier and the waste heat recovery system, and the waste heat recovery system is also provided with an electric auxiliary heater for electrically heating waste heat; after adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference, the system further includes: When the return air humidity of the air conditioner is less than the preset humidity threshold, the air conditioner is controlled to switch to the temperature closed-loop control mode. In the temperature closed-loop control mode: Adjust the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier; and / or Adjusting the opening degree of the heat recovery bypass valve; adjusting the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier specifically includes: The total heat recovery amount of the waste heat recovery system is determined based on the frequency of the condenser fan of the waste heat recovery system. The heat recovery amount of the rotary dehumidifier is determined based on the heat recovery rate of the rotary dehumidifier and the target dew point temperature. Using the heat recovery amount of the rotary dehumidifier and the total heat recovery amount of the waste heat recovery system as inputs, the power of the electric auxiliary heater is determined according to a preset heat recovery function.

2. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that, The determination of the first dew point temperature and / or the second dew point temperature of the lithium battery workshop specifically includes: The dry-bulb temperature, wet-bulb temperature, and relative humidity values ​​at multiple measurement points within the lithium battery workshop are obtained, and the dew point temperature at each measurement point is calculated. Based on the dew point temperature of each measurement point and the corresponding weighting coefficient, the first dew point temperature and / or the second dew point temperature of the lithium battery workshop are determined according to a preset weighted accumulation formula.

3. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that, The adjustment of the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference specifically includes: Obtain the adjustment coefficient and reference regeneration temperature of the rotary dehumidifier, and determine the standard regeneration temperature based on the adjustment coefficient, the reference regeneration temperature, and the first dew point temperature difference; or If the first dew point temperature difference is greater than a preset temperature difference threshold, then the adjustment coefficient, correction coefficient, and reference regeneration temperature of the rotary dehumidifier are obtained, and the standard regeneration temperature is determined based on the adjustment coefficient, the correction coefficient, the reference regeneration temperature, and the first dew point temperature difference.

4. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that, After controlling the air conditioner to switch to the humidity closed-loop control mode, the method further includes: Control the regeneration energy consumption of the rotary dehumidifier to switch to standard regeneration energy consumption; and / or Controlling the variable frequency evaporator to set a temperature less than or equal to the target dew point temperature; and / or Increase the water flow rate of the cold water coil.

5. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that, Also includes: Obtain the operating frequency of the variable frequency evaporator; When the operating frequency is less than or equal to the preset standard operating frequency, the electric auxiliary heater is controlled to stop heating, and the operating frequency of the variable frequency evaporator is gradually increased.

6. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that, The method of adjusting the dehumidification power of the air conditioner based on the second dew point temperature difference between the second dew point temperature and the target dew point temperature specifically includes: When the second dew point temperature difference is greater than a preset first temperature difference threshold, the compressor frequency of the variable frequency evaporator is increased by a first frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is increased by a first adjustment opening degree; and / or When the second dew point temperature difference is less than a preset second temperature difference threshold, the compressor frequency of the variable frequency evaporator is reduced by a second frequency adjustment amount, and the opening of the electronic expansion valve of the variable frequency evaporator is reduced by a second adjustment opening degree; and / or When the second dew point temperature difference is between the first temperature difference threshold and the second temperature difference threshold, the compressor frequency of the variable frequency evaporator is kept constant, and the opening degree of the electronic expansion valve of the variable frequency evaporator is kept constant.

7. An air conditioner, characterized in that, It includes a processor and a memory; wherein the memory stores a computer program for being loaded by the processor and executed as described in any one of claims 1-6, which is an air conditioning dehumidification power control method based on a constant dew point temperature.

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