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

Abstract

The invention provides an air conditioner dehumidification power control method based on a constant dew point temperature and an air conditioner, and relates to the field of air conditioners, the air conditioner dehumidification power control method comprises the steps that a first dew point temperature difference between a first dew point temperature of a lithium battery workshop and a target dew point temperature is determined, and a standard regeneration temperature of a rotary dehumidifier is adjusted based on the first dew point temperature difference; when the return air humidity of the air conditioner is larger than or equal to the preset humidity threshold value, the air conditioner is controlled to be switched to a humidity closed-loop control mode, and the regeneration temperature of the rotary dehumidifier is reduced to be lower than the standard regeneration temperature; and the second dew point temperature of the lithium battery workshop is determined in the humidity closed-loop control mode, 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. And 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, and energy waste caused by excessive dehumidification is avoided on the premise that the dew-point temperature of the lithium battery workshop is kept stable.

Description

Technical Field

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

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

[0003] Conventional air conditioning systems can handle high-humidity workshop air through heat-moisture coupling. However, this can lead to low air conditioning efficiency and an inability to maintain a stable low dew point, making it difficult to meet the strict constant dew point requirements of lithium battery workshops. Even if rotary dehumidification technology is used to maintain a low dew point in the workshop, the air conditioning system still consumes high energy consumption for regenerative heating at low dew points. Summary of the Invention

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

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

[0006] determining a first dew point temperature difference between a first dew point temperature of a lithium battery workshop and the target dew point temperature, and adjusting a 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 a preset humidity threshold, the air conditioner is controlled to switch to a 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, a second dew point temperature of the lithium battery workshop is determined, and the dehumidification power of the air conditioner is adjusted based on a 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] obtain dry-bulb temperature, wet-bulb temperature and relative humidity value of each measuring point in the lithium battery workshop, and calculate dew point temperature of each measuring point respectively;

[0011] determine first dew point temperature and / or second dew point temperature of the lithium battery workshop according to preset weighted accumulation formula based on dew point temperature of each measuring point and corresponding weight coefficient.

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

[0013] obtain 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 preset temperature difference threshold value, obtain adjustment coefficient, correction coefficient and reference regeneration temperature of the rotary dehumidifier, and determine the standard regeneration temperature based on the adjustment coefficient, the correction coefficient, the reference regeneration temperature and the first dew point temperature difference.

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

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

[0017] controlling the set adjustment temperature of the variable frequency evaporator to be less than or equal to the target dew point temperature; and / or

[0018] increasing water flow of the cold water coil.

[0019] In an embodiment, a heat recovery bypass valve is arranged 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 waste heat; after the adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference, further comprising:

[0020] when return air humidity of the air conditioner is less than preset humidity threshold value, controlling the air conditioner to switch to temperature closed-loop control mode;

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

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

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

[0024] In an embodiment, the power of the electric auxiliary heater is adjusted based on the heat recovery rate of the rotary dehumidifier, specifically comprising:

[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 according to the heat recovery rate of the rotary dehumidifier and the target dew point temperature;

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

[0028] In an embodiment, the expression of the heat recovery function is:

[0029]

[0030] Wherein, the P is the power of the electric auxiliary heater; the Q a is the total heat recovery amount of the waste heat recovery system, the calculation formula of which is Q a =k·f+Q0, the f is the operating frequency of the condenser fan, the k is the influence coefficient, the value range of which is 0.5-1.2, and the Q0 is the basic heat recovery amount of the condenser fan; the Q b is the heat recovery amount of the rotary dehumidifier; the η1 is the heat recovery efficiency of the rotary dehumidifier at the target dew point temperature, the calculation formula of which is The T set is the target dew point temperature, the a is the reference heat recovery coefficient, the value range of which is 0.8±0.05, the b is the temperature influence index, the value range of which is -0.05±0.001, and the c is the heat recovery compensation coefficient, the value range of which is 0.1±0.02; and the η2 is the heat conversion efficiency of the electric auxiliary heater.

[0031] In an embodiment, further comprising:

[0032] Obtaining 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 increased step by step.

[0034] In an embodiment, 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, specifically comprising:

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

[0036] When the second dew point temperature difference is less than a preset second temperature difference threshold, reducing the compressor frequency of the variable frequency evaporator by a second frequency adjustment amount, and reducing the opening of the electronic expansion valve of the variable frequency evaporator by a second adjustment opening; 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 controlled to remain unchanged, and the opening degree of the electronic expansion valve of the variable frequency evaporator is controlled to remain unchanged.

[0038] In a second aspect, the present application provides an air conditioner comprising a processor and a memory; wherein the memory stores a computer program, and the computer program is used by the processor to load and execute the air conditioner dehumidification power control method based on constant dew point temperature as described in any one of the first aspects.

[0039] In the air conditioning dehumidification power control method based on constant dew point temperature and the air conditioner of this embodiment, the standard regeneration temperature of the rotary dehumidifier is dynamically adjusted according to the first dew point temperature difference, and 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, and the regeneration temperature of the rotary dehumidifier is reduced to below the standard regeneration temperature, which can avoid 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 re-determined second dew point temperature difference, thereby avoiding energy waste caused by excessive dehumidification while maintaining the dew point temperature of the lithium battery workshop stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A flow chart of a method for controlling air conditioning dehumidification power based on a constant dew point temperature is provided as a flowchart of an embodiment of the present application.

[0042] Figure 2 A schematic structural diagram of an electronic device provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0043] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, and not all, of the embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the description of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0044] In the description of the present invention, unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0045] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0046] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0047] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0048] The air conditioning system of 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 cold water coil, which reduces the dew point of the fresh air to about 9°C by introducing chilled water at about 7°C. The water inlet pipe of the cold water coil is equipped with an electric regulating valve, which can dynamically adjust the water flow of the chilled water according to the first dew point temperature difference; the cryogenic module is equipped with a variable frequency evaporator to reduce the air dew point to below -30°C to meet the requirements of the lithium battery process. Its compressor frequency can be adjusted between 30-70Hz, and can achieve a cooling capacity of 60kW±20%; the regeneration module is equipped with a rotary dehumidifier, which can cooperate 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 of the coating machine in the lithium battery workshop and preheat the regenerated air to 80°C. The electric auxiliary heater can provide additional heating to meet the heat required for regeneration of the rotary dehumidifier.

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

[0050] Step S10: determining a first dew point temperature difference between a first dew point temperature of a lithium battery workshop and the target dew point temperature, and adjusting a 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 a preset humidity threshold, the air conditioner is controlled to switch to a humidity closed-loop control mode, and the regeneration temperature of the rotary dehumidifier is lowered to below the standard regeneration temperature;

[0052] Step S30: determining a second dew point temperature of the lithium battery workshop in the humidity closed-loop control mode, and adjusting the 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.

[0053] In the air conditioning dehumidification power control method based on constant dew point temperature of this embodiment, the standard regeneration temperature of the rotary dehumidifier is dynamically adjusted according to the first dew point temperature difference, and 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, and the regeneration temperature of the rotary dehumidifier is reduced to below the standard regeneration temperature, which can avoid 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 re-determined second dew point temperature difference, so as to avoid energy waste caused by excessive dehumidification while maintaining the dew point temperature of the lithium battery workshop stable.

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

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

[0056] Temperature and humidity sensors are installed at multiple locations such as the fresh air duct inlet of the air conditioner, the outlet of the pre-cooling module, the inlet of the regeneration module, and the return air outlet of the lithium battery workshop. The temperature and humidity sensors can directly measure the dry bulb temperature T at each measuring point. db , wet bulb temperature T wb And relative humidity value RH. When the relative humidity value is greater than 50%, according to the formula Determine the dew point temperature T at each measuring pointd When the relative humidity value RH is less than or equal to 50%, the formula Determine the dew point temperature T at each measuring point d .

[0057] If temperature and humidity sensors are installed at the air conditioning duct inlet, pre-cooling module outlet, regeneration module inlet, and the return air outlet of the lithium battery workshop, four measurement points are formed. Since the fresh air duct inlet directly reflects the outdoor air state and plays a decisive role in the subsequent dehumidification load, its weight coefficient is 0.5; the pre-cooling module outlet reflects the pre-cooling treatment effect and affects the cryogenic module load, its weight coefficient is 0.15; the regeneration module inlet is used to assist in verifying the air state before regeneration and has a lower weight of only 0.1; the actual workshop humidity demand of the workshop return air outlet of the lithium battery workshop is used for closed-loop control feedback and has a weight of 0.25. The temperature of each measurement point is multiplied by the corresponding coefficient and accumulated to obtain the first dew point temperature of the lithium battery workshop. It is understood that the number of measurement points and the corresponding weight 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 traditional air-conditioning system that uses a fixed regeneration temperature, it can directly reduce the energy consumption of electric auxiliary heating and achieve precise control of regeneration heating energy consumption from the source.

[0059] The adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference specifically includes: obtaining an adjustment coefficient and a 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 in the workshop is small, that is, when the first dew point temperature difference does not change much, the formula T can be used. regen =T base +k1·ΔT1 to calculate the standard regeneration temperature. regen is the standard regeneration temperature, T base is the reference regeneration temperature, k1 is the adjustment coefficient, and ΔT1 is the first dew point temperature difference. base It refers to the minimum temperature required for the regeneration of the rotary dehumidifier under standard operating conditions (the inlet air dew point temperature is 0°C and the relative humidity is 50%). It is the basic temperature to ensure that the moisture adsorbed in the silica gel material of the rotary dehumidifier can be effectively desorbed. Its value is usually 85-95°C; the adjustment coefficient k1 is used to reflect the response sensitivity to dew point changes. It is related to the characteristics of the rotary dehumidifier material and its value range is 0.4-0.7.

[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 benchmark regeneration temperature of the rotary dehumidifier are obtained, and the standard regeneration temperature is determined based on the adjustment coefficient, the correction coefficient, the benchmark regeneration temperature and the first dew point temperature difference.

[0062] When the dew point temperature in the workshop fluctuates greatly, such as in summer rainstorms, the formula T can be used. regen =T base + k1·k2·ΔT1 to calculate the standard regeneration temperature. k2 is a correction factor that compensates for the attenuation of the wheel regeneration efficiency under high humidity loads and avoids 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 a preset humidity threshold, the air conditioner is controlled to switch to a humidity closed-loop control mode, and the regeneration temperature of the rotary dehumidifier is lowered to below the standard regeneration temperature.

[0064] The return air humidity of the air conditioner refers to the relative humidity value of the air returned 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 (for example, the relative humidity in the lithium battery filling room is required to be ≤20%). The return air humidity of the air conditioner can be collected in real time through 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 means that the wet load of the lithium battery workshop is high. At this time, it is necessary to lower the rotor regeneration temperature, reduce the electric auxiliary heating input while ensuring the dehumidification effect, and control the air conditioner to switch to the humidity closed-loop control mode.

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

[0067] Standard regeneration energy consumption is a pre-calibrated optimal value based on the target dew point temperature and current humidity load. This switch prevents excess or insufficient regeneration energy in high-humidity conditions. By calculating the required heat for regeneration in real time, the electric auxiliary heater power is maintained at a standard value, avoiding the frequent full-power on / off cycles of traditional systems and reducing current surges.

[0068] Controlling the adjustable temperature of the variable frequency evaporator at or below the target dew point can ensure that the dew point of the air meets the standard after deep cooling treatment. By lowering the adjustable 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 cold water coil, the fresh air is initially cooled and dehumidified to the dew point temperature, which can bear most of the sensible heat load, reduce the burden on the subsequent deep cooling module, shorten the response time of sudden changes in humidity, and is suitable for the rapid switching of the working environment in the lithium battery workshop.

[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, 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, it also 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 of the heat recovery bypass valve.

[0072] When the return air humidity is less than 20%, the air conditioning system automatically switches to temperature closed-loop control. At this time, the wet load is low. By using the regenerated exhaust temperature as the control variable, the heat recovery amount and the 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] The power of the electric auxiliary heater is adjusted based on the heat recovery rate of the rotary dehumidifier, specifically including: determining the total heat recovery amount of the waste heat recovery system based on the frequency of the condensing fan; determining the heat recovery amount of the rotary dehumidifier according to 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 input, determining the power of the electric auxiliary heater according to a preset heat recovery function.

[0074] The condensing fan is installed on the exhaust duct of the waste heat recovery system. It can accelerate the exhaust of waste heat and recover heat simultaneously through forced convection. The higher the frequency, the greater the exhaust volume of waste heat. The frequency of the condensing fan can be measured in real time by the frequency converter and calculated according to the formula Q a =k·f+Q0 to calculate the total heat recovery capacity of the waste heat recovery system, where Q a is the total heat recovery capacity of the waste heat recovery system, f is the operating frequency of the condensing fan, k is the influence coefficient, and its value range is 0.5-1.2, and Q0 is the basic heat recovery capacity of the condensing fan.

[0075] The heat recovery rate of the rotary dehumidifier refers to the efficiency of the rotary dehumidifier in recovering waste heat at the target dew point temperature, which can be calculated by the formula Determine, wherein η1 is the heat recovery efficiency of the rotary dehumidifier at the target dew point temperature, and Tset is the target dew point temperature, a is the benchmark heat recovery coefficient, and its value range is 0.8±0.05, b is the temperature influence index, and its value range is -0.05±0.001, and c is the heat recovery compensation coefficient, and its value range is 0.1±0.02.

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

[0077]

[0078] Wherein, P is the power of the electric auxiliary heater; Q a is the total heat recovery capacity of the waste heat recovery system; b is the heat recovery amount of the rotary dehumidifier; η1 is the heat recovery efficiency of the rotary dehumidifier at the target dew point temperature; and η2 is the heat conversion efficiency of the electric auxiliary heater.

[0079] The heat recovery bypass valve regulates the waste heat flow from the waste heat recovery system. When the air conditioner switches to closed-loop temperature control mode, precise control of the heat recovery rate is required to maintain a stable dew point. If the bypass valve opening is reduced, the flow of waste heat through the heat recovery system increases, increasing the amount of heat recovered by the rotary dehumidifier. This can lead to higher regeneration temperatures, which in turn affects the dehumidification effect and dew point. If the bypass valve opening is increased, some waste heat can be directly discharged, bypassing the heat recovery system, reducing the amount of heat recovered and preventing dew point fluctuations caused by excessively high regeneration temperatures. Furthermore, the waste heat recovery system and the electric auxiliary heater share the task of heat replenishment. When the heat recovery rate is insufficient, the electric auxiliary heater's power can be increased to compensate for the heat and maintain the target dew point. When the heat recovery rate is sufficient, the electric auxiliary heater's power can be reduced to reduce the air conditioning system's energy consumption.

[0080] In one embodiment, the method further includes: obtaining 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 increasing the operating frequency of the variable frequency evaporator step by step.

[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. At this time, if the electric auxiliary heater continues to work, the return air temperature of the air conditioner will be too high, which will lead to additional energy consumption of the variable frequency evaporator.

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

[0083] Step S30: determining a second dew point temperature of the lithium battery workshop in the humidity closed-loop control mode, and adjusting the 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.

[0084] The second dew point temperature is a temperature re-determined in the humidity closed-loop control mode. The second dew point temperature can be determined by referring to the calculation method of the first dew point temperature, which will not be described in detail here.

[0085] The 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, increasing the compressor frequency of the variable frequency evaporator by a first frequency adjustment amount, and increasing the opening of the electronic expansion valve of the variable frequency evaporator by a first adjustment opening; and / or

[0087] When the second dew point temperature difference is less than a preset second temperature difference threshold, reducing the compressor frequency of the variable frequency evaporator by a second frequency adjustment amount, and reducing the opening of the electronic expansion valve of the variable frequency evaporator by a second adjustment opening; 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 controlled to remain unchanged, and the opening degree of the electronic expansion valve of the variable frequency evaporator is controlled to remain unchanged.

[0089] When the second dew point temperature difference is greater than the preset first temperature difference threshold, indicating high humidity in the workshop, the inverter evaporator's compressor frequency can be gradually increased using the first frequency, and the electronic expansion valve opening can be gradually increased using the first adjustment opening, thereby increasing the inverter evaporator's cooling and dehumidification capabilities. When the second dew point temperature difference is less than the preset first temperature difference threshold, indicating low humidity in the workshop, the inverter evaporator's compressor frequency can be gradually decreased using the second frequency, and the electronic expansion valve opening can be gradually decreased using the second adjustment opening, thereby reducing the inverter evaporator's cooling and dehumidification capabilities. When the second dew point temperature difference is between the first and second temperature difference thresholds, the workshop humidity is appropriate and no further adjustments are required; the compressor frequency and electronic expansion valve opening need only be maintained unchanged.

[0090] Because cooling capacity and dehumidification capacity are positively correlated, simply increasing the compressor frequency can easily lead to excessively low temperatures and frosting on the variable-frequency evaporator. By synergistically adjusting the electronic expansion valve opening and compressor frequency, this can be avoided, while also reducing the evaporator's energy consumption. Furthermore, due to the strict dew point requirements in lithium battery workshops, excessive dehumidification can lead to high compressor loads and a surge in energy consumption. By using graded regulation, dehumidification power can be maintained at an appropriate level while maintaining a stable dew point.

[0091] In summary, in the air conditioning dehumidification power control method based on constant dew point temperature of 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, and 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, and the regeneration temperature of the rotary dehumidifier is reduced to below the standard regeneration temperature, which can avoid the regeneration temperature from being kept high, thereby 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 frequency of the compressor, it is possible to avoid frost caused by the variable frequency evaporator being too low in temperature, and at the same time reduce the energy consumption of the variable frequency evaporator. In addition, since the lithium battery workshop has strict requirements on the dew point temperature, excessive dehumidification will cause the compressor to run at high load and energy consumption to surge. Through graded adjustment, the dehumidification power can be maintained at a just right level while ensuring the stability of the dew point.

[0092] Based on the same inventive concept as the above embodiment, this embodiment also provides an air conditioner, including a processor and a memory; wherein the memory stores a computer program, and the computer program is used to be loaded by the processor and execute the above-mentioned air conditioner dehumidification power control method based on constant dew point temperature.

[0093] like Figure 2 As shown, based on the same inventive concept as the above embodiment, this embodiment also provides a computer-readable storage medium, which stores instructions, and the instructions are used by the processor to load and execute the air conditioning dehumidification power control method based on constant dew point temperature as mentioned above.

[0094] In the embodiments of the mobile terminal and computer-readable storage medium provided in this application, all technical features of the above-mentioned control method embodiments are included. The expansion and explanation content of the specification are basically the same as those of the above-mentioned method embodiments, and will not be repeated here.

[0095] An embodiment of the present application further provides a computer program product, which includes computer program code. When the computer program code runs on a computer, the computer executes the methods in the various possible implementation modes described above.

[0096] An embodiment of the present application also provides a chip, including a memory and a processor, wherein the memory is used to store computer programs, and the processor is used to call and run the computer programs from the memory, so that a device equipped with the chip executes the methods in the various possible implementation modes as described above.

[0097] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

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

[0099] In this application, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0100] The various technical features of the technical solution of this application can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various 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 this application.

[0101] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium as above, including a number of instructions for enabling a terminal device to execute the method of each embodiment of the present application. The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the content of the present application specification and drawings, or directly or indirectly used in other related technical fields, is similarly included in the scope of patent protection of the present application. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0102] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for controlling air conditioning dehumidification power based on a constant dew point temperature, characterized in that: The method is applied to a lithium battery workshop equipped with an air conditioning system, wherein the air conditioning system includes a pre-cooling module, a cryogenic module, and a regeneration module connected in sequence. The pre-cooling module is provided with a cold water coil for initial cooling and dehumidification. The cryogenic module is provided with a variable frequency evaporator for further cooling to a target dew point temperature or below. The regeneration module is provided with a rotary dehumidifier to cooperate with the waste heat recovery system of the lithium battery workshop to recover waste heat. The method includes: determining a first dew point temperature difference between a first dew point temperature of a lithium battery workshop and the target dew point temperature, and adjusting a 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 a preset humidity threshold, the air conditioner is controlled to switch to a 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, a second dew point temperature of the lithium battery workshop is determined, and the dehumidification power of the air conditioner is adjusted based on a second dew point temperature difference between the second dew point temperature and the target dew point temperature.

2. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that: The determining of the first dew point temperature and / or the second dew point temperature of the lithium battery workshop specifically includes: Obtain the dry-bulb temperature, wet-bulb temperature, and relative humidity values ​​of multiple measurement points in the lithium battery workshop, and calculate the dew point temperature of each measurement point; Based on the dew point temperature of each measurement point and the corresponding weight 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 adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference specifically includes: Obtaining an adjustment coefficient and a 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; or 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.

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: Controlling the regeneration energy consumption of the rotary dehumidifier to switch to standard regeneration energy consumption; and / or Controlling the variable frequency evaporator to set the adjustment temperature to be less than or equal to the target dew point temperature; and / or Increase the water flow rate of the chilled water coil.

5. The air conditioning dehumidification power control method based on constant dew point temperature according to any one of claims 1 to 4, characterized in that: 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 waste heat. After adjusting the standard regeneration temperature of the rotary dehumidifier based on the first dew point temperature difference, the method further includes: When the return air humidity of the air conditioner is lower than a preset humidity threshold, the air conditioner is controlled 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 Adjust the opening of the heat recovery bypass valve.

6. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 5, characterized in that: The adjusting the power of the electric auxiliary heater based on the heat recovery rate of the rotary dehumidifier specifically includes: determining a total heat recovery amount of the waste heat recovery system based on a frequency of a condensing fan of the waste heat recovery system; determining a heat recovery amount of the rotary dehumidifier according to a heat recovery rate of the rotary dehumidifier and the target dew point temperature; The heat recovery capacity of the rotary dehumidifier and the total heat recovery capacity of the waste heat recovery system are used as inputs, and the power of the electric auxiliary heater is determined according to a preset heat recovery function.

7. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 6, characterized in that: The expression of the heat recovery function is: Wherein, P is the power of the electric auxiliary heater; Q a is the total heat recovery capacity of the waste heat recovery system, and its calculation formula is Q a =k·f+Q0, where f is the operating frequency of the condensing fan, k is the influence coefficient, and its value range is 0.5-1.2, and Q0 is the basic heat recovery amount of the condensing fan; b is the heat recovery amount of the rotary dehumidifier; η1 is the heat recovery efficiency of the rotary dehumidifier at the target dew point temperature, and its calculation formula is: The T set is the target dew point temperature, the a is the benchmark heat recovery coefficient, and its value range is 0.8±0.05, the b is the temperature influence index, and its value range is -0.05±0.001, the c is the heat recovery compensation coefficient, and its value range is 0.1±0.02; the η2 is the thermal conversion efficiency of the electric auxiliary heater.

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

9. The air conditioning dehumidification power control method based on constant dew point temperature according to claim 1, characterized in that: The 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, increasing the compressor frequency of the variable frequency evaporator by a first frequency adjustment amount, and increasing the opening of the electronic expansion valve of the variable frequency evaporator by a first adjustment opening; and / or When the second dew point temperature difference is less than a preset second temperature difference threshold, reducing the compressor frequency of the variable frequency evaporator by a second frequency adjustment amount, and reducing the opening of the electronic expansion valve of the variable frequency evaporator by a second adjustment opening; 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 controlled to remain unchanged, and the opening degree of the electronic expansion valve of the variable frequency evaporator is controlled to remain unchanged.

10. An air conditioner, characterized in that: It comprises a processor and a memory; wherein the memory stores a computer program, and the computer program is used for the processor to load and execute the air conditioning dehumidification power control method based on constant dew point temperature as described in any one of claims 1 to 9.

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