Air handling unit and control method

Abstract

The air handling unit and the control method belong to the technical field of air conditioners. The air handling unit comprises a controller, a fan, a surface cooling coil and an electric heater. The controller is configured to input a first temperature set by a user and a current total heat load of the air handling unit into a humidity control model to obtain a second temperature output by the humidity control model. The second temperature is greater than a current machine dew point temperature. The surface cooling coil is controlled to cool air passing through the surface cooling coil to the second temperature. If the second temperature is less than the first temperature, the electric heater is further controlled to heat the air to the first temperature. The fan is further controlled to deliver the air passing through the surface cooling coil and the electric heater to a room. The energy consumption of the air handling unit can be reduced by using the air handling unit and the control method.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and in particular to an air handling unit and control method. Background Technology

[0002] An air handling unit (AHU) is a centralized air handling system that includes components such as cooling coils, electric heaters, and fans, and is capable of regulating the temperature and humidity of indoor air.

[0003] The AHU's current process for regulating indoor air temperature and humidity involves the following steps: A fan sequentially delivers air to the cooling coils and then to the electric heater. As the air passes through the cooling coils, they cool it to the machine's dew point temperature, thus achieving cooling and dehumidification. Since the air dew point temperature is generally lower than the user-set temperature, the electric heater then warms the dehumidified air to the user-set temperature. Finally, the fan returns the air, having passed through the cooling coils and heater, to the room, thus regulating the indoor air temperature and humidity.

[0004] In the process of adjusting the air temperature and humidity, the air needs to be cooled down to the machine's dew point temperature before being heated up to the user-set temperature, which will increase the AHU's energy consumption. Summary of the Invention

[0005] To address the related technical problems, this disclosure provides an air handling unit and its control method. The technical solution is as follows:

[0006] In a first aspect, an air handling unit is provided, the air handling unit including a controller, a fan, a cooling coil, and an electric heater, the controller being used for:

[0007] The user-set first temperature and the current total heat load of the air handling unit are input into the pre-set temperature and humidity control model, and the temperature and humidity control model outputs a second temperature, wherein the second temperature is greater than the current machine dew point temperature;

[0008] The cooling coil is controlled to cool the air passing through it to the second temperature.

[0009] When the second temperature is lower than the first temperature, the electric heater is controlled to raise the temperature of the air passing through the electric heater to the first temperature;

[0010] The fan is controlled to deliver air through the cooling coil and the electric heater into the room.

[0011] In one possible implementation, the controller is used to:

[0012] The user-defined first temperature, first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into the pre-set temperature and humidity control model, which then outputs the second temperature.

[0013] In one possible implementation, the temperature and humidity control model is obtained based on sample input data and sample output data; wherein,

[0014] The sample input data includes the sample set temperature, sample set humidity, sample latent heat load, and sample sensible heat load;

[0015] The sample output data is the third temperature that the air needs to reach after passing through the cooling coil under the first condition. The third temperature is greater than the machine dew point temperature corresponding to the sample input data. The first condition is that the humidity of the air delivered to the room by the air handling unit is within a first difference range from the humidity set in the sample, and the temperature of the air delivered to the room by the air handling unit is within a second difference range from the temperature set in the sample.

[0016] In one possible implementation, the temperature and humidity control model includes a first temperature and humidity control model or a second temperature and humidity control model, and the controller is used for:

[0017] When the total heat load is determined to be greater than the first load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set first temperature and humidity control model, and the first temperature and humidity control model outputs a fourth temperature, wherein the fourth temperature is used to control the temperature difference between the air passing through the surface cooling coil and the electric heater and the first temperature to be within the set third difference range.

[0018] When the total heat load is determined to be less than the second load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set second temperature and humidity control model, and the second temperature and humidity control model outputs a fifth temperature, wherein the first load threshold is greater than or equal to the second load threshold, and the fifth temperature is used to control the difference between the humidity of the air passing through the cooling coil and the electric heater and the first humidity within a set fourth difference range.

[0019] In one possible implementation, the controller is further configured to:

[0020] Before inputting the user-set first temperature and the current total heat load of the air handling unit into the pre-set temperature and humidity control model, it is determined that the difference between the latent heat load and the sensible heat load included in the total heat load is within the set fifth difference range.

[0021] In one possible implementation, the controller is further configured to:

[0022] If the current indoor temperature is higher than the first temperature, reduce the heating level of the electric heater. If the heating level is reduced to the lowest level and the detected temperature of the air passing through the cooling coil is higher than the second temperature, increase the opening of the water valve of the cooling coil.

[0023] If the current indoor temperature is lower than the first temperature, and the detected temperature is lower than the second temperature, then the opening of the water valve of the cooling coil is reduced. If the water valve opening reaches the minimum opening and the detected temperature is still lower than the second temperature, then the heating level of the electric heater is increased.

[0024] In a second aspect, a control method for an air handling unit is provided, the method being applied to the air handling unit as described in the first aspect, the method comprising:

[0025] The user-set first temperature and the current total heat load of the air handling unit are input into the pre-set temperature and humidity control model, and the temperature and humidity control model outputs a second temperature, wherein the second temperature is greater than the current machine dew point temperature;

[0026] The cooling coil is controlled to cool the air passing through it to the second temperature.

[0027] When the second temperature is lower than the first temperature, the electric heater is controlled to raise the temperature of the air passing through the electric heater to the first temperature;

[0028] The fan is controlled to deliver air through the cooling coil and the electric heater into the room.

[0029] In one possible implementation, the step of inputting the user-set first temperature and the current total heat load of the air handling unit into a pre-set temperature and humidity control model, and having the temperature and humidity control model output a second temperature, includes:

[0030] The user-defined first temperature, first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into the pre-set temperature and humidity control model, which then outputs the second temperature.

[0031] In one possible implementation, the temperature and humidity control model is obtained based on sample input data and sample output data; wherein,

[0032] The sample input data includes the sample set temperature, sample set humidity, sample latent heat load, and sample sensible heat load;

[0033] The sample output data is the third temperature that the air needs to reach after passing through the cooling coil under the first condition. The third temperature is greater than the machine dew point temperature corresponding to the sample input data. The first condition is that the humidity of the air delivered to the room by the air handling unit is within a first difference range from the humidity set in the sample, and the temperature of the air delivered to the room by the air handling unit is within a second difference range from the temperature set in the sample.

[0034] In one possible implementation, the temperature and humidity control model includes a first temperature and humidity control model or a second temperature and humidity control model, and the method further includes:

[0035] When the total heat load is determined to be greater than the first load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set first temperature and humidity control model, and the first temperature and humidity control model outputs a fourth temperature, wherein the fourth temperature is used to control the temperature difference between the air passing through the surface cooling coil and the electric heater and the first temperature to be within the set third difference range.

[0036] When the total heat load is determined to be less than the second load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set second temperature and humidity control model, and the second temperature and humidity control model outputs a fifth temperature, wherein the first load threshold is greater than or equal to the second load threshold, and the fifth temperature is used to control the difference between the humidity of the air passing through the cooling coil and the electric heater and the first humidity within a set fourth difference range.

[0037] In one possible implementation, the method further includes:

[0038] Before inputting the user-set first temperature and the current total heat load of the air handling unit into the pre-set temperature and humidity control model, it is determined that the difference between the latent heat load and the sensible heat load included in the total heat load is within the set fifth difference range.

[0039] In one possible implementation, the method further includes:

[0040] If the current indoor temperature is higher than the first temperature, reduce the heating level of the electric heater. If the heating level is reduced to the lowest level and the detected temperature of the air passing through the cooling coil is higher than the second temperature, increase the opening of the water valve of the cooling coil.

[0041] If the current indoor temperature is lower than the first temperature, and the detected temperature is lower than the second temperature, then the opening of the water valve of the cooling coil is reduced. If the water valve opening reaches the minimum opening and the detected temperature is still lower than the second temperature, then the heating level of the electric heater is increased.

[0042] Thirdly, a computer device is provided, comprising a memory and a processor, the memory for storing computer instructions, and the processor for executing the computer instructions stored in the memory to cause the computer device to perform the methods provided in the first aspect and its possible implementations.

[0043] Fourthly, a computer-readable storage medium is provided, which stores computer program code, such that when the computer program code is executed by a computer device, the computer device performs the method provided by the first aspect and its possible implementations.

[0044] Fifthly, a computer program product is provided, comprising computer program code, wherein when the computer program code is executed by a computer device, the computer device executes the method provided by the first aspect and its possible implementations.

[0045] In the air handling unit disclosed herein, the temperature and humidity control model in the controller can control the second temperature of the cooling coil based on the user-set temperature and the current total heat load output of the air handling unit. This allows the cooling coil to cool and dehumidify the air under the control of the second temperature. Since the second temperature is higher than the machine's dew point temperature, both the cooling effect of the cooling coil and the subsequent heating effect of the electric heater on the air are reduced, thus lowering the energy consumption of the air handling unit. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of an air handling unit provided in an embodiment of this disclosure;

[0047] Figure 2 This is a schematic diagram of the structure of a controller provided in an embodiment of this disclosure;

[0048] Figure 3 This is a schematic diagram of the processing flow of a control method for an air handling unit provided in an embodiment of this disclosure;

[0049] Figure 4This is a schematic diagram of an optimizable region of a temperature and humidity control model provided in an embodiment of this disclosure;

[0050] Figure 5 This is a schematic diagram of the processing flow of a control panel cooling coil and an electric heater provided in an embodiment of this disclosure;

[0051] Figure 6 This is a schematic diagram of a process for controlling the cooling coil and electric heater when the indoor load increases, provided by an embodiment of this disclosure.

[0052] Figure 7 This is a schematic diagram of a process for controlling the cooling coil and electric heater when the indoor load decreases, provided in an embodiment of this disclosure. Detailed Implementation

[0053] This disclosure provides an air handling unit, which is a centralized air handling system including components such as a cooling coil, an electric heater, and a fan, capable of regulating the temperature and humidity of indoor air.

[0054] The air handling unit includes a controller 1, a fan 2, a cooling coil 3, and an electric heater 4. The cooling coil 3 is filled with refrigerant. The controller 1 can regulate the refrigerant flow by changing the opening of the water valve on the cooling coil 3, thereby regulating the air temperature and humidity. The electric heater 4 has heating levels, and the controller 1 can adjust the air temperature by changing the heating level of the electric heater 4. The structure of the air handling unit can be found in [reference needed]. Figure 1 In one example, the air handling unit can be equipped with two fans 2. One fan 2 is mainly responsible for sequentially delivering air to the cooling coil and the electric heater, while the other fan 2 is mainly responsible for delivering the air processed by the cooling coil and the electric heater to the room. The air passing through the air handling unit can be outdoor fresh air or a mixture of outdoor fresh air and indoor return air in a preset ratio, which can be pre-set by technicians. When the air passes through the cooling coil 3, the cooling coil 3 can cool and dehumidify the passing air, while the electric heater 4 can heat the passing air, thereby achieving the regulation of the air's temperature and humidity.

[0055] From a hardware perspective, the structure of controller 1 can be, for example... Figure 2 As shown, it includes at least a processor 210 and a memory 220.

[0056] The processor 210 can be a central processing unit (CPU), a system on chip (SoC), a microcontroller unit (MCU), a digital signal processor (DSP), etc. The processor 210 can be used to process various operation instructions, such as inputting the user-set first temperature and the current total heat load of the air handling unit into a pre-set temperature and humidity control model, and outputting the second temperature of the cooling coil through the temperature and humidity control model.

[0057] The memory 220 may include various volatile or non-volatile memories, such as solid-state disks (SSDs) and dynamic random access memory (DRAM). The memory 220 can be used to store initial data, intermediate data, and result data used in the relevant processing, such as storing second temperature, sensible heat load, latent heat load, etc.

[0058] In some embodiments, the process of an air handling unit regulating the temperature and humidity of indoor air includes: a fan sequentially delivering air to a cooling coil and an electric heater. As the air passes through the cooling coil, it is cooled to the machine's dew point temperature, thus achieving cooling and dehumidification. Since the air dew point temperature is generally lower than the user-set temperature, the electric heater then heats the dehumidified air to the user-set temperature. Finally, the fan returns the air, having passed through the cooling coil and electric heater, to the room to regulate the indoor air temperature and humidity. This process of cooling the air to the machine's dew point temperature before heating it to the user-set temperature increases the energy consumption of the air handling unit.

[0059] To address the aforementioned problems, this disclosure provides a control method for an air handling unit, the processing flow of which is as follows: Figure 3 As shown, it includes the following steps:

[0060] 301. Input the user-set first temperature and the current total heat load of the air handling unit into the pre-set temperature and humidity control model, and output the second temperature from the temperature and humidity control model.

[0061] Total heat load, also known as total load, is the actual load of the environment in which the air handling unit is located. It includes sensible heat load and latent heat load. The product of total heat load and the proportion of sensible heat is the sensible heat load, and the product of total heat load and the proportion of latent heat is the latent heat load. The ratio of total heat load to rated load is the load factor.

[0062] The second temperature is higher than the current machine dew point temperature. The machine dew point temperature refers to the temperature at which the air cooling coil approaches saturation after processing, and it is related to the air temperature and humidity. Saturation refers to the point where the water vapor content in the air reaches its maximum. The current machine dew point temperature is determined based on the temperature and humidity of the air currently supplied to the cooling coil.

[0063] The user-defined first temperature, first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into the pre-set temperature and humidity control model, which then outputs the second temperature.

[0064] The temperature and humidity control model is derived from sample input and output data. The sample input data includes the sample set temperature, sample set humidity, sample latent heat load, and sample sensible heat load. These parameters can be obtained from historical values ​​of the air handling unit or set by technicians based on experience. The sample latent heat load can be 20%, 30%, 40%, etc. The specific training process for the temperature and humidity control model will be explained in detail later and will not be repeated here.

[0065] In one example, the temperature and humidity control model may also include a first temperature and humidity control model, a second temperature and humidity control model, or a third temperature and humidity control model. The second temperature output by the temperature and humidity control model may also include a fourth temperature output by the first temperature and humidity control model, a fifth temperature output by the second temperature and humidity control model, or a sixth temperature output by the third temperature and humidity control model.

[0066] When the total heat load is determined to be greater than the first load threshold (high load rate), the user-set first temperature, set first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into a pre-set first temperature and humidity control model. The first temperature and humidity control model then outputs a fourth temperature. This fourth temperature is used to control the temperature difference between the air passing through the cooling coil and electric heater and the first temperature to be within a set third difference range. Under high load rate conditions, a temperature priority mode can be used, meaning the air processed by the air handling unit prioritizes meeting the user-set first temperature. The condition for meeting the first temperature is that the temperature difference between the air processed by the air handling unit and the user-set first temperature is less than the third difference range. The third difference range can be preset by technicians, for example, [-0.5, +0.5].

[0067] When the total heat load is determined to be less than the second load threshold (low load rate), the user-set first temperature, set first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into a pre-set second temperature and humidity control model. The second temperature and humidity control model then outputs a fifth temperature. The first load threshold is greater than or equal to the second load threshold, and the fifth temperature is used to control the difference between the humidity of the air passing through the cooling coil and electric heater and the first humidity within a set fourth difference range. Under low load rate conditions, a humidity priority mode can be used, meaning the air processed by the air handling unit prioritizes meeting the user-set first humidity. The condition for meeting the first humidity is that the difference between the humidity of the air processed by the air handling unit and the user-set first humidity is less than the fourth difference range. The fourth difference range can be preset by technicians, for example, [-10%, +10%].

[0068] The first load threshold, second load threshold, third difference range, and fourth difference range mentioned above can be preset by a technician. The first load threshold can be greater than or equal to the second load threshold.

[0069] When the first load threshold is greater than the second load threshold, and the total heat load is greater than the second load threshold but less than the first load threshold, or when the total heat load is equal to the first load threshold or equal to the second load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set third temperature and humidity control model to obtain the sixth temperature. The third temperature and humidity control model ensures that the air processed by the air handling unit simultaneously meets the user-set first temperature and first humidity; that is, the temperature difference between the air processed by the air handling unit and the user-set first temperature is within a third difference range, and the humidity difference between the air processed by the air handling unit and the user-set first humidity is within a fourth difference range.

[0070] When the first load threshold is equal to the second load threshold, and the total heat load is equal to the first load threshold (or equal to the second load threshold), the first temperature and humidity control model or the second temperature and humidity control model can be arbitrarily selected to obtain the fourth temperature, the fifth temperature or the sixth temperature.

[0071] The training process for the aforementioned temperature and humidity control model, or the first, second, and third temperature and humidity control models, will be further described below and will not be repeated here.

[0072] 302, the control coil cools the air passing through the coil to the second temperature.

[0073] The cooling coil has a water valve switch. The controller can adjust the opening degree of the water valve switch, thereby changing the refrigerant flow rate in the cooling coil and thus changing the cooling and dehumidification capacity of the cooling coil. When the temperature of the air passing through the cooling coil is higher than the second temperature, the water valve opening degree is increased; when the temperature of the air passing through the cooling coil is lower than the second temperature, the water valve opening degree is decreased. The specific control process will be explained in detail in the following processing flow, and will not be repeated here.

[0074] 303, when the second temperature is lower than the first temperature, control the electric heater to raise the temperature of the air passing through the electric heater to the first temperature.

[0075] If the second temperature is lower than the first temperature set by the user, then the temperature of the air passing through the cooling coil is lower than the first temperature set by the user. Therefore, the controller turns on the electric heater, and the air is heated to the first temperature by the electric heater.

[0076] If the second temperature is greater than the first temperature set by the user, the controller will not turn on the electric heater and will adjust the opening of the water valve of the cooling coil through the above-mentioned step 302.

[0077] 304, the control fan delivers air through the surface cooling coil and electric heater to the room.

[0078] The air handling unit periodically samples indoor temperature and humidity using temperature and humidity sensors. This data is used to monitor whether the air handling unit's current output meets the user-defined minimum temperature and humidity levels. The cycle can be preset by a technician.

[0079] Air handling units are commonly used in public places such as subways, bank lobbies, and hospital lobbies. These places generally have low requirements for temperature and humidity (especially humidity), requiring only a range within the user-defined temperature and humidity settings. This disclosure allows for adjusting the temperature and humidity to near the user-defined settings while simultaneously reducing the energy consumption of the air handling unit, thus balancing user comfort with energy efficiency.

[0080] In one possible implementation, before inputting the user-set first temperature and the current total heat load of the air handling unit into the pre-set temperature and humidity control model in step 301 above, the controller also needs to determine whether the difference between the latent heat load and the sensible heat load included in the total heat load is within a set fifth difference range. This fifth difference range can be preset by technicians, for example, 30, 50, etc. When the latent heat load is greater than the sensible heat load and the difference exceeds the fifth difference range, the air handling unit will perform extensive dehumidification on the cooling coils, causing the temperature to drop below the set temperature, requiring reheating with an electric heater. This makes it difficult to simultaneously meet the set temperature and set humidity under energy-saving conditions. Similarly, when the sensible heat load is greater than the latent heat load and the difference exceeds the fifth difference range, it is also difficult to simultaneously meet the set temperature and set humidity under energy-saving conditions. Based on the fifth difference range, an optimizable region can be determined. The optimizable region can be, for example... Figure 4 As shown, the horizontal axis represents sensible heat load and the vertical axis represents latent heat load. It can be seen that the optimizable region is closer to the straight line corresponding to the function y = x.

[0081] In this way, the controller can determine in advance whether the current total heat load meets the conditions for energy-saving optimization. If the difference between the latent heat load and the sensible heat load in the total heat load is too large, the air handling unit will have difficulty simultaneously meeting the user's set temperature and set humidity. When the difference between the latent heat load and the sensible heat load included in the total heat load is within the set fifth difference range, the control logic of this scheme can be used to control the air handling unit, thereby reducing the energy consumption of the air handling unit.

[0082] In one possible implementation, the training process for the temperature and humidity control model can be as follows:

[0083] Multiple sets of input data are input into the temperature and humidity control model to obtain corresponding output data. Optionally, the input process can be automated through modeling. A set of sample input data may yield multiple output data. Among the multiple output data, the output data that meets the first condition is selected as the sample output data. The sample output data is the third temperature that the air after passing through the cooling coil needs to reach under the first condition. The third temperature is greater than the machine dew point temperature corresponding to the sample input data. The first condition corresponding to the first temperature and humidity control model in step 301 is that the temperature difference between the air delivered to the room by the air handling unit and the sample set temperature is within a second difference range. The first condition corresponding to the second temperature and humidity control model in step 301 is that the humidity difference between the air delivered to the room by the air handling unit and the sample set humidity is within a first difference range. The first condition corresponding to the third temperature and humidity control model in step 301 is that the humidity difference between the air delivered to the room by the air handling unit and the sample set humidity is within a first difference range, and the temperature difference between the air delivered to the room by the air handling unit and the sample set temperature is within a second difference range. The first and second difference ranges can be preset by technicians. For example, the first condition could be: the temperature difference between the air supplied to the room by the air handling unit and the sample set temperature is within the range of [-0.5, +0.5], and the humidity difference between the air supplied to the room by the air handling unit and the sample set humidity is within the range of [-10%, +10%]. Then, regression analysis is performed on each set of sample input data and corresponding sample output data to obtain the temperature and humidity control model. The temperature and humidity control model can be a multinomial function or a neural network model, such as a convolutional neural network.

[0084] The above sample input data is the sample data required to train the temperature and humidity control model when the air handling unit is at a fixed frequency. For variable frequency air handling units, the sample input data of the temperature and humidity control model can also include the sample fan frequency. In this way, the fan frequency can also be used as a parameter to calculate energy consumption. The second temperature output by the temperature and humidity control model is a second temperature that meets the user's set first temperature and first humidity and can make the energy consumption of the air handling unit smaller.

[0085] In one possible implementation, the processing flow of the control panel cooling coil and electric heater can be, for example... Figure 5 As shown, it includes the following steps:

[0086] 501. If the current indoor temperature is higher than the first temperature, reduce the heating level of the electric heater. If the heating level is reduced to the lowest level and the detected temperature of the air passing through the cooling coil is higher than the second temperature, increase the opening of the water valve of the cooling coil.

[0087] Optionally, the indoor temperature can be either the indoor air temperature detected by a temperature sensor or the return air temperature detected by a temperature sensor.

[0088] For example Figure 6 As shown, when the detected indoor temperature is higher than the first temperature set by the user, the controller determines whether the heating level of the electric heater is at the lowest level. If the heating level of the electric heater is not at the lowest level, the heating level of the electric heater is reduced. If the heating level of the electric heater is at the lowest level, the controller determines whether the detected temperature of the air passing through the cooling coil is higher than the second temperature. If the detected temperature of the air passing through the cooling coil is higher than the second temperature, the controller determines whether the water valve opening of the cooling coil is at the maximum opening. If it is not at the maximum opening, the water valve opening of the cooling coil is increased.

[0089] 502. If the current indoor temperature is lower than the first temperature, and the detected temperature is lower than the second temperature, then reduce the opening of the water valve on the cooling coil. If the water valve opening reaches the minimum opening and the detected temperature is still lower than the second temperature, then increase the heating level of the electric heater.

[0090] For example Figure 7 As shown, when the indoor temperature is detected to be lower than the first temperature set by the user, the controller determines whether the detected temperature of the air passing through the cooling coil is higher than the second temperature. If the detected temperature of the air passing through the cooling coil is lower than the second temperature, the controller determines whether the water valve opening of the cooling coil is at its minimum. If it is not at its minimum, the controller reduces the water valve opening of the cooling coil. If it is at its minimum, the controller determines whether the heating level of the electric heater is at its maximum. If the heating level of the electric heater is not at its maximum, the controller increases the heating level of the electric heater.

[0091] In the air handling unit disclosed herein, the temperature and humidity control model in the controller can control the second temperature of the cooling coil based on the user-set temperature and the current total heat load output of the air handling unit. This allows the cooling coil to cool and dehumidify the air under the control of the second temperature. Since the second temperature is higher than the machine's dew point temperature, both the cooling effect of the cooling coil and the subsequent heating effect of the electric heater on the air are reduced, thus lowering the energy consumption of the air handling unit.

[0092] This disclosure also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of being stored by a computing device, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to perform a method of business processing, or instruct the computing device to perform a method of business processing.

[0093] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0095] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0096] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0097] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the scope of the claims.

[0098] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An air handling unit, characterized in that, The air handling unit includes a controller, a fan, surface cooling coils, and an electric heater. The controller is used for: The user-set first temperature and the current total heat load of the air handling unit are input into the pre-set temperature and humidity control model, and the temperature and humidity control model outputs a second temperature, wherein the second temperature is greater than the current machine dew point temperature; The cooling coil is controlled to cool the air passing through it to the second temperature. When the second temperature is lower than the first temperature, the electric heater is controlled to raise the temperature of the air passing through the electric heater to the first temperature; The fan is controlled to deliver air through the cooling coil and the electric heater into the room.

2. The air handling unit according to claim 1, characterized in that, The controller is used for: The user-defined first temperature, first humidity, and the current latent heat load and sensible heat load of the air handling unit are input into the pre-set temperature and humidity control model, which then outputs the second temperature.

3. The air handling unit according to claim 2, characterized in that, The temperature and humidity control model is obtained based on sample input data and sample output data; wherein... The sample input data includes the sample set temperature, sample set humidity, sample latent heat load, and sample sensible heat load; The sample output data is the third temperature that the air needs to reach after passing through the cooling coil under the first condition. The third temperature is greater than the machine dew point temperature corresponding to the sample input data. The first condition is that the humidity of the air delivered to the room by the air handling unit is within a first difference range from the humidity set in the sample, and the temperature of the air delivered to the room by the air handling unit is within a second difference range from the temperature set in the sample.

4. The air handling unit according to claim 2, characterized in that, The temperature and humidity control model includes a first temperature and humidity control model or a second temperature and humidity control model, and the controller is used for: When the total heat load is determined to be greater than the first load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set first temperature and humidity control model, and the first temperature and humidity control model outputs a fourth temperature, wherein the fourth temperature is used to control the temperature difference between the air passing through the surface cooling coil and the electric heater and the first temperature to be within the set third difference range. When the total heat load is determined to be less than the second load threshold, the user-set first temperature, the set first humidity, the current latent heat load and sensible heat load of the air handling unit are input into the pre-set second temperature and humidity control model, and the second temperature and humidity control model outputs a fifth temperature, wherein the first load threshold is greater than or equal to the second load threshold, and the fifth temperature is used to control the difference between the humidity of the air passing through the cooling coil and the electric heater and the first humidity within a set fourth difference range.

5. The air handling unit according to any one of claims 1 to 4, characterized in that, The controller is also used for: Before inputting the user-set first temperature and the current total heat load of the air handling unit into the pre-set temperature and humidity control model, it is determined that the difference between the latent heat load and the sensible heat load included in the total heat load is within the set fifth difference range.

6. The air handling unit according to any one of claims 1 to 5, characterized in that, The controller is also used for: If the current indoor temperature is higher than the first temperature, reduce the heating level of the electric heater. If the heating level is reduced to the lowest level and the detected temperature of the air passing through the cooling coil is higher than the second temperature, increase the opening of the water valve of the cooling coil. If the current indoor temperature is lower than the first temperature, and the detected temperature is lower than the second temperature, then the opening of the water valve of the cooling coil is reduced. If the water valve opening reaches the minimum opening and the detected temperature is still lower than the second temperature, then the heating level of the electric heater is increased.

7. A control method for an air handling unit, characterized in that, The method is applied to an air handling unit as described in any one of claims 1-6, the method comprising: The user-set first temperature and the current total heat load of the air handling unit are input into the pre-set temperature and humidity control model, and the temperature and humidity control model outputs a second temperature, wherein the second temperature is greater than the current machine dew point temperature; The cooling coil is controlled to cool the air passing through it to the second temperature. When the second temperature is lower than the first temperature, the electric heater is controlled to raise the temperature of the air passing through the electric heater to the first temperature; The fan is controlled to deliver air through the cooling coil and the electric heater into the room.

8. A computer device, characterized in that, The computer device includes a memory and a processor, the memory being used to store computer instructions; The processor executes computer instructions stored in the memory to cause the computer device to perform the method of claim 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program code, which, when executed by a computer device, performs the method described in claim 7.

10. A computer program product, characterized in that, The computer program product includes computer program code, which, when executed by a computer device, performs the method described in claim 7.

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