Combination air cabinet and temperature control method, temperature control device and storage medium thereof

Abstract

The application discloses a combined air cabinet and a temperature control method, a control device and a storage medium thereof, wherein the combined air cabinet comprises cold water coils and hot water coils, and a first electric valve corresponding to the cold water coils and a second electric valve corresponding to the hot water coils; the control method comprises the following steps: acquiring an indoor environment temperature and a set temperature; determining a PI controller output value according to the indoor environment temperature and the set temperature; and controlling the first electric valve or the second electric valve according to the PI controller output value. The control method adopts a PI controller segmented control mode to control the valves of two different energy sources of the air cabinet, avoids energy waste caused by simultaneous opening or frequent switching of the valves of the two energy sources, and improves the stability of the system.

Description

Technical Field

[0001] This application relates to the field of modular air handling units, specifically to a temperature control method for modular air handling units, a temperature control device for modular air handling units, a computer-readable storage medium, and a modular air handling unit. Background Technology

[0002] Current combined air conditioning systems include a fresh air dehumidifier, an air conditioning surface cooler, a heater, and a humidifier. The fresh air dehumidifier can independently reduce the humidity of the fresh air, avoiding the cooling and heating cancellation phenomenon caused by the mutual interference of the air conditioning surface cooler, heater, and humidifier. A PLC (Programmable Logic Controller) regulates the opening of the electric valves of the fresh air surface cooler, the mixing air surface cooler, the heater, and the humidifier, thereby adjusting the air processing efficiency of these components. Furthermore, based on the supply air temperature and humidity sensor signals, PID (Proportional Integral Derivative) control is applied to achieve energy savings in the combined air conditioning unit.

[0003] However, conventional PID control methods use different PID controllers to control different electric valves. Since the controlled object is generally a system with large inertia and pure time delay, due to the inherent characteristics of the system, it is inevitable that the cold water valve and the hot water valve will open at the same time, causing the cold and heat sources to cancel each other out, wasting energy. In addition, setting and adjusting the parameters of multiple PID controllers is more complicated and can easily cause system oscillation. Summary of the Invention

[0004] In view of the above problems, this application provides a combined air handling unit and its temperature control method, control device and storage medium. By adopting a segmented control method with a PI controller, the valves of the air handling unit with two different energy sources can be controlled, which can avoid energy waste caused by the simultaneous opening or frequent switching of the valves of the two energy sources and improve the stability of the system.

[0005] In a first aspect, this application provides a temperature control method for a combined air handling unit, the combined air handling unit comprising: a cold water coil and a hot water coil, and a first electric valve corresponding to the cold water coil and a second electric valve corresponding to the hot water coil, the method comprising: acquiring an indoor ambient temperature and a set temperature; determining a PI controller output value based on the indoor ambient temperature and the set temperature; and controlling the first electric valve or the second electric valve based on the PI controller output value.

[0006] In the technical solution of this application embodiment, the output value of the PI controller can be determined based on the relationship between the set temperature and the indoor ambient temperature. The corresponding electric valve is then controlled according to the PI controller output value to ensure a constant indoor temperature. For example, when the indoor ambient temperature is higher than the set temperature, it indicates a high indoor temperature, requiring control of the cold water valve (first electric valve). In this case, the corresponding PI controller output value is within the first range, and the first electric valve is controlled based on the PI controller output value. Conversely, when the indoor ambient temperature is lower than the set temperature, it indicates a low indoor temperature, requiring control of the hot water valve (second electric valve). In this case, the corresponding PI controller output value is within the second range, and the second electric valve is controlled based on the PI controller output value. This segmented control method avoids the energy waste caused by simultaneous opening or frequent switching of the cold water valve (first electric valve) and hot water valve (second electric valve) as in related technologies, thus improving system stability.

[0007] In some embodiments, determining the PI controller output value based on the indoor ambient temperature and the set temperature includes: obtaining the temperature difference between the set temperature and the indoor ambient temperature; determining the PI controller output value in a first segment when the temperature difference is less than a set threshold; and determining the PI controller output value in a second segment when the temperature difference is greater than the set threshold, wherein the first segment and the second segment constitute the output segment of the PI controller.

[0008] By dividing the output of a PI controller into two segments, the PI controller output value in the first segment adjusts the opening of the cold water valve (first electric valve), and the PI controller output value in the second segment adjusts the opening of the hot water valve (second electric valve). This segmented control method using the same PI controller can avoid energy waste caused by the simultaneous opening or frequent switching of the hot and cold water valves.

[0009] In some embodiments, controlling the first or second electric valve according to the PI controller output value includes: when the PI controller output value is in the first range, determining a first PI controller output value based on the temperature difference, and controlling the opening of the first electric valve according to the first PI controller output value; when the PI controller output value is in the second range, determining a second PI controller output value based on the temperature difference, and controlling the opening of the second electric valve according to the second PI controller output value. This allows for obtaining the opening of the corresponding electric valve based on different PI controller output values, achieving precise adjustment of the electric valve opening.

[0010] In some embodiments, the temperature difference is positively correlated with the output value of the PI controller. That is, the PI controller output value can be determined based on the temperature difference, and the opening degree of the corresponding electric valve can be determined based on the PI controller output value, thus enabling more precise control of the electric valve opening to ensure that the indoor temperature meets the user's needs.

[0011] In some embodiments, when the temperature difference is less than a set threshold, the output value of the PI controller is negatively correlated with the opening degree of the first electric valve; when the temperature difference is greater than the set threshold, the output value of the PI controller is positively correlated with the opening degree of the second electric valve.

[0012] In some embodiments, the division ratio of the first segment and the second segment is determined based on the outdoor ambient temperature.

[0013] Determining the ratio of the first and second zones based on outdoor temperature can meet the needs of different regions. For example, in southern regions, the first zone occupies a larger proportion than the second zone, while in northern regions, the first zone occupies a smaller proportion than the second zone. Therefore, by adjusting the ratio of the first and second zones according to different outdoor temperatures, the control method of this application becomes more versatile and can basically meet the needs of different operating conditions.

[0014] In some embodiments, acquiring indoor ambient temperature includes: acquiring temperature sampling values ​​from at least one temperature sensor installed indoors; and determining the indoor ambient temperature based on at least one of the temperature sampling values. Acquiring indoor temperature using multiple sensors can improve the accuracy of temperature acquisition and also avoid the situation where controlling the opening of the hot or cold water valve due to temperature sensor failure would cause the indoor temperature to deviate from its constant state, thus affecting the user experience.

[0015] In some embodiments, determining the indoor ambient temperature based on at least one of the temperature sampled values ​​includes: when there are multiple temperature sampled values ​​and all of the multiple temperature sampled values ​​meet a preset condition, determining the indoor ambient temperature based on the average of the multiple temperature sampled values; and when there is only one temperature sampled value and the preset condition is met, using the temperature sampled value as the indoor ambient temperature. When multiple sensors are present, determining the indoor ambient temperature based on the average temperature is more accurate and can ensure the uniformity of the indoor temperature.

[0016] Secondly, this application provides a temperature control device for a combined air handling unit, the combined air handling unit including: a cold water coil and a hot water coil, and a first electric valve corresponding to the cold water coil and a second electric valve corresponding to the hot water coil. The device includes: a temperature acquisition module for acquiring an indoor ambient temperature and a set temperature; and a control module for determining a PI controller output value based on the indoor ambient temperature and the set temperature, and controlling the first electric valve or the second electric valve based on the PI controller output value.

[0017] In the technical solution of this application embodiment, the output value of the PI controller can be determined based on the relationship between the set temperature and the indoor ambient temperature. The corresponding electric valve is then controlled according to the PI controller output value to ensure a constant indoor temperature. For example, when the indoor ambient temperature is higher than the set temperature, it indicates a high indoor temperature, requiring control of the cold water valve (first electric valve). In this case, the corresponding PI controller output value is within the first range, and the first electric valve is controlled based on the PI controller output value. Conversely, when the indoor ambient temperature is lower than the set temperature, it indicates a low indoor temperature, requiring control of the hot water valve (second electric valve). In this case, the corresponding PI controller output value is within the second range, and the second electric valve is controlled based on the PI controller output value. This segmented control method avoids the energy waste caused by simultaneous opening or frequent switching of the cold water valve (first electric valve) and hot water valve (second electric valve) as in related technologies, thus improving system stability.

[0018] Thirdly, this application provides a computer-readable storage medium storing a temperature control program for a combined air handling unit, which, when executed by a processor, implements the temperature control method for the combined air handling unit of the first aspect.

[0019] Fourthly, this application provides a combined air handling unit, including a memory, a processor, and a temperature control program for the combined air handling unit stored in the memory and executable on the processor. When the processor executes the temperature control program for the combined air handling unit, it implements the temperature control method for the combined air handling unit of the first aspect.

[0020] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a flowchart of a temperature control method for a combined air handling unit according to some embodiments of this application;

[0023] Figure 2 This is a schematic diagram of temperature control for a combined air handling unit according to some embodiments of this application;

[0024] Figure 3 This is a block diagram of a temperature control device for a combined air handling unit according to some embodiments of this application;

[0025] Figure 4 This is a block diagram of a combined air handling unit according to some embodiments of this application. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] Currently, the cold water valve and hot water valve of the combined air handling unit are controlled by separate PI controllers. However, when the indoor ambient temperature is close to the set temperature, if there is a heat source indoors, such as an increase in the number of people or the presence of equipment that releases heat, the indoor ambient temperature will fluctuate around the set temperature. Using separate PI controllers to control the valves, i.e., one PI controller to control the cold water valve and another PI controller to control the hot water valve, can easily lead to frequent opening and closing of the cold water and hot water valves, reducing the stability of the system. At the same time, the cold water valve and hot water valve may be open simultaneously. Although this can keep the indoor ambient temperature constant at the set temperature, it is not energy-efficient and wastes energy.

[0035] To address the energy waste and poor system stability caused by simultaneous opening or frequent switching of cold and hot water valves, the applicant discovered that a single PI controller can be used to control the cold and hot water valves in segments. When the indoor ambient temperature is higher than the set temperature, the cold water valve is considered to need to be opened, and the PI controller output value is in the first segment, determining the opening degree of the cold water valve based on this output value. Conversely, when the indoor ambient temperature is lower than the set temperature, the hot water valve is considered to need to be opened, and the PI controller output value is in the second segment, determining the opening degree of the hot water valve based on this output value. This ensures that the hot and cold water valves do not open simultaneously, preventing energy waste caused by frequent switching.

[0036] The temperature control method of the combined air handling unit in this application embodiment can be applied to temperature regulation in workshops, and can also be used for indoor temperature regulation in office buildings, etc.

[0037] The following embodiments are for illustrative purposes only and are combined with... Figure 1 The temperature control method of this application is described.

[0038] According to some embodiments of this application, refer to Figure 2 The combined air handling unit includes a cold water coil 11 and a hot water coil 12, as well as a first electric valve 13 corresponding to the cold water coil 11 and a second electric valve 14 corresponding to the hot water coil 12. The cold water coil 11 is used to exchange heat between the incoming cold water and the indoor air to lower the indoor temperature, and the hot water coil 12 is used to exchange heat between the incoming hot water and the indoor air to raise the indoor temperature.

[0039] When the indoor ambient temperature is higher than the set temperature, the first electric valve 13 is opened, allowing cold water to enter the cold water coil 11 for heat exchange. Indoor air enters the cold water coil 11 through the return air duct 15, exchanges heat with the cold water, and then enters the room through the supply air duct 16 to lower the indoor temperature. Similarly, when the indoor ambient temperature is lower than the set temperature, the second electric valve 14 is opened, allowing hot water to enter the hot water coil 12 for heat exchange. Indoor air enters the hot water coil 12 through the return air duct 15, exchanges heat with the hot water, and then enters the room through the supply air duct 16 to raise the indoor temperature.

[0040] like Figure 1 As shown, the temperature control method for the combined air handling unit in this application may include the following steps:

[0041] S1 acquires the indoor ambient temperature and the set temperature. The set temperature can be calibrated according to actual conditions; for example, the set temperature can be 25℃.

[0042] S2 determines the PI controller output value based on the indoor ambient temperature and the set temperature.

[0043] S3 controls the first or second electric valve based on the output value of the PI controller.

[0044] Specifically, the indoor ambient temperature is first acquired. This can be done, for example, through a temperature sensor installed indoors or through other electrical equipment connected to the combined air handling unit. Based on the relationship between the indoor ambient temperature and the set temperature, the electric valves that need to be opened are determined. When the indoor ambient temperature is higher than the set temperature (i.e., the temperature difference between the set temperature and the indoor ambient temperature is less than a set threshold), the first electric valve (cold water valve) needs to be opened to lower the indoor ambient temperature. When the indoor ambient temperature is lower than the set temperature (i.e., the temperature difference between the set temperature and the indoor ambient temperature is greater than the set threshold), the second electric valve (hot water valve) needs to be opened to raise the indoor ambient temperature. It should be noted that when the indoor ambient temperature equals the set temperature, both the first and second electric valves are closed.

[0045] When the indoor ambient temperature is higher than the set temperature, the PI controller output value is controlled within the first set range. Based on the correspondence between the PI controller output value and the opening degree of the first electric valve, the opening degree of the first electric valve is adjusted to lower the indoor ambient temperature and bring it up to the set temperature.

[0046] Similarly, when the indoor ambient temperature is lower than the set temperature, the PI controller output value is adjusted within the second set range according to the correspondence between the PI controller output value and the opening degree of the second electric valve. This raises the indoor ambient temperature to reach the set temperature.

[0047] By using a segmented control method with a PI controller, the PI controller opens the cold water valve when the indoor ambient temperature is higher than the set temperature, and opens the hot water valve when the indoor ambient temperature is lower than the set temperature. Using the same PI controller to control different valves in segments avoids energy waste caused by the simultaneous opening of hot and cold water valves or frequent switching, while improving the reliability of the system.

[0048] According to some embodiments of this application, determining the output value of a PI controller based on the indoor ambient temperature and a set temperature includes: acquiring the temperature difference between the set temperature and the indoor ambient temperature; determining the PI controller output value in a first segment when the temperature difference is less than a set threshold; and determining the PI controller output value in a second segment when the temperature difference is greater than the set threshold, wherein the first segment and the second segment constitute the output segment of the PI controller. The set threshold can be calibrated according to actual conditions; for example, the set threshold can be 0.

[0049] Assuming the output range of the PI controller is represented by 100%, then the first and second ranges are divided into 100% segments according to a certain ratio, together forming the output range of the PI controller. Figure 2 The PI controller shown is divided into two output segments: a first segment (0-70%) and a second segment (70%-100%). When the ambient temperature is higher than the set temperature (temperature difference less than the set threshold), the PI controller outputs in the first segment, for example, 30%. When the ambient temperature is lower than the set temperature (temperature difference greater than the set threshold), the PI controller outputs in the second segment, for example, 80%. This allows a single PI controller to control the first and second electric valves in segments, preventing both valves from opening simultaneously.

[0050] According to some embodiments of this application, controlling a first electric valve or a second electric valve based on the output value of a PI controller includes: when the PI controller output value is in a first segment, determining the first PI controller output value based on a temperature difference, and controlling the opening degree of the first electric valve based on the first PI controller output value; when the PI controller output value is in a second segment, determining the second PI controller output value based on a temperature difference, and controlling the opening degree of the second electric valve based on the second PI controller output value.

[0051] The output value of the PI controller can be determined based on the magnitude of the temperature difference. Then, by establishing the correspondence between the PI controller output value and the electric valve opening, the adjustment degree of the electric valve can be determined. For example, when the indoor ambient temperature is 30℃ and the set temperature is 25℃, the temperature difference is -5℃. The PI controller output value is in the first range. According to the correspondence, when the temperature difference is -5℃, the first PI controller output value is 30%, and the corresponding opening degree of the first electric valve is 50%. As another example, when the indoor ambient temperature is 24℃ and the set temperature is 25℃, the temperature difference is 1℃. The PI controller output value is in the second range. According to the correspondence, when the temperature difference is 1℃, the second PI controller output value is 80%, and the corresponding opening degree of the second electric valve is 20%. Thus, the opening degree of the electric valve can be obtained based on different PI controller output values, achieving precise adjustment of the electric valve opening.

[0052] According to some embodiments of this application, the temperature difference is positively correlated with the output value of the PI controller, the output value of the first PI controller is negatively correlated with the opening degree of the first electric valve, and the output value of the second PI controller is positively correlated with the opening degree of the second electric valve.

[0053] In other words, the output value of the PI controller can be determined based on the temperature difference, and the opening degree of the corresponding electric valve can be determined based on the output value of the PI controller, so as to more accurately control the opening degree of the electric valve and make the indoor temperature meet the user's needs.

[0054] When the indoor ambient temperature is higher than the set temperature (i.e., the temperature difference between the set temperature and the indoor ambient temperature is less than the set threshold), the larger the temperature difference, the larger the output value of the first PI controller, and the smaller the opening of the corresponding first electric valve; conversely, the smaller the temperature difference, the smaller the output value of the first PI controller, and the larger the opening of the corresponding first electric valve. For example, when the indoor ambient temperature is 30℃ and the set temperature is 25℃, the temperature difference is -5℃, the corresponding PI controller output value is 30%, and the opening of the corresponding first electric valve is A; when the indoor ambient temperature is 28℃, the temperature difference is -3℃, the corresponding first PI controller output value is 50%, and the opening of the corresponding first electric valve is B, where B is less than A.

[0055] When the indoor ambient temperature is lower than the set temperature (i.e., the temperature difference between the set temperature and the indoor ambient temperature is greater than the set threshold), the larger the temperature difference, the larger the output value of the second PI controller, and the larger the opening degree of the corresponding second electric valve; conversely, the smaller the temperature difference, the smaller the output value of the second PI controller, and the smaller the opening degree of the corresponding second electric valve. For example, when the indoor ambient temperature is 24℃ and the set temperature is 25℃, the temperature difference is 1℃, the corresponding second PI controller output value is 80%, and the corresponding opening degree of the second electric valve is C; when the indoor ambient temperature is 22℃, the temperature difference is 3℃, the corresponding second PI controller output value is 90%, and the corresponding opening degree of the second electric valve is D, where D is greater than C.

[0056] According to some embodiments of this application, the division ratio of the first section and the second section is determined based on the outdoor ambient temperature.

[0057] Determining the ratio of the first and second zones based on outdoor temperature can meet the needs of different regions. For example, in southern regions, the first zone occupies a larger proportion than the second zone, while in northern regions, the first zone occupies a smaller proportion than the second zone. Therefore, adjusting the ratio of the first and second zones according to different outdoor temperatures makes the control method of this application more versatile and can basically meet the needs of different operating conditions. In addition, in some other embodiments of this application, the ratio of the first and second zones can also be set according to the actual requirements of indoor ambient temperature.

[0058] According to some embodiments of this application, obtaining indoor ambient temperature includes: obtaining temperature sampling values ​​from at least one temperature sensor installed indoors; and determining the indoor ambient temperature based on the at least one temperature sampling value.

[0059] Specifically, when multiple temperature sensors are installed indoors, the temperature sample value of each sensor can be obtained, and the indoor ambient temperature can be obtained based on the average of all temperature sample values. Therefore, using multiple sensors to collect indoor temperature data improves the accuracy of temperature acquisition and avoids the inability to maintain a constant indoor temperature due to sensor failure, which could negatively impact user experience.

[0060] According to some embodiments of this application, determining the indoor ambient temperature based on at least one temperature sampling value includes: when there are multiple temperature sampling values ​​and all of the multiple temperature sampling values ​​meet preset conditions, determining the indoor ambient temperature based on the average value of the multiple temperature sampling values; and when there is only one temperature sampling value and the preset conditions are met, using the temperature sampling value as the indoor ambient temperature.

[0061] The preset condition is that when the temperature sampling value fluctuates within a certain range around the set temperature, the temperature sampling value of the temperature sensor is considered normal. If it exceeds a certain value, the temperature sensor corresponding to that temperature sampling value is considered abnormal.

[0062] When multiple temperature sensors are used, and each sensor is functioning normally, the average of the temperature samples collected by these sensors is taken as the indoor ambient temperature. When only one temperature sensor is used, if that sensor is functioning normally, its temperature sample value is taken as the indoor ambient temperature. If multiple temperature sensors are used and one sensor fails, the temperature sample value corresponding to the failed sensor is discarded, and the temperature sample values ​​collected by the other sensors are used to determine the indoor ambient temperature. Therefore, determining the indoor ambient temperature based on the average temperature is more accurate and ensures the uniformity of the indoor temperature.

[0063] According to some embodiments of this application, refer to Figure 2 As shown, the room temperature controlled by the blower unit is collected using temperature probes (the number can be set according to room requirements; three are used as an example). The average temperature of each sampling point is taken as the indoor ambient temperature. The indoor ambient temperature is compared with the set temperature, and the output value of the PI controller is determined based on the temperature comparison result. The opening degree of the corresponding valve is controlled according to the output value of the PI controller.

[0064] Specifically, when the indoor ambient temperature is higher than the set temperature, the PI controller output value ranges from 0% to 70%, and the opening degree of the cold water valve (first electric valve) is inversely proportional to the PI controller output value; that is, when the PI controller output value is 0% to 70%, the corresponding opening degree of the cold water valve ranges from 100% to 0%. When the indoor ambient temperature is lower than the set temperature, the PI controller output value ranges from 70% to 100%, and the opening degree of the hot water valve (second electric valve) is directly proportional to the PI controller output value; that is, when the PI controller output value is 70% to 100%, the corresponding opening degree of the hot water valve ranges from 0% to 100%.

[0065] When temperature probes T1, T2, and T3 are all normal and there is no failure, the indoor ambient temperature T = 33.33% * T1 + 33.33% * T2 + 33.33% * T3; when temperature probes T1 and T2 are normal and T3 is faulty, the indoor ambient temperature T = 50% * T1 + 50% * T2; when temperature probe T1 is normal and T2 and T3 are faulty, the indoor ambient temperature T = 100% * T1.

[0066] In summary, the technical solution of this application determines the segment of the PI controller output value based on the temperature difference between the set temperature and the indoor ambient temperature. Different PI controller output values ​​are output in different segments, and the opening degree of the corresponding electric valve is adjusted according to the PI controller output value to ensure a constant indoor temperature. Furthermore, the segmented control method avoids the energy waste caused by the simultaneous opening or frequent switching of the cold water valve (first electric valve) and hot water valve (second electric valve) controlled separately by two PI controllers in related technologies, thus improving system stability.

[0067] Corresponding to the above embodiments, this application also proposes a temperature control device for a combined air handling unit.

[0068] In some embodiments of this application, the combined air handling unit includes: a cold water coil and a hot water coil, as well as a first electric valve corresponding to the cold water coil and a second electric valve corresponding to the hot water coil.

[0069] like Figure 3 As shown, the temperature control device 100 of this application may include a temperature acquisition module 110 and a control module 120.

[0070] The temperature acquisition module 110 is used to acquire the indoor ambient temperature and the set temperature. The control module 120 is used to determine the PI controller output value based on the indoor ambient temperature and the set temperature, and to control the first electric valve or the second electric valve based on the PI controller output value.

[0071] According to some embodiments of this application, the control module 120 determines the output value of the PI controller based on the indoor ambient temperature and the set temperature, specifically for: obtaining the temperature difference between the set temperature and the indoor ambient temperature; determining the PI controller output value in the first segment when the temperature difference is less than a set threshold; and determining the PI controller output value in the second segment when the temperature difference is greater than the set threshold, wherein the first segment and the second segment constitute the output segment of the PI controller.

[0072] According to some embodiments of this application, the control module 12 controls the first electric valve or the second electric valve according to the output value of the PI controller. Specifically, it is used to: determine the output value of the first PI controller based on the temperature difference when the output value of the PI controller is in the first segment, and control the opening degree of the first electric valve according to the output value of the first PI controller; and determine the output value of the second PI controller based on the temperature difference when the output value of the PI controller is in the second segment, and control the opening degree of the second electric valve according to the output value of the second PI controller.

[0073] According to some embodiments of this application, the temperature difference is positively correlated with the output value of the PI controller, the output value of the first PI controller is negatively correlated with the opening degree of the first electric valve, and the output value of the second PI controller is positively correlated with the opening degree of the second electric valve.

[0074] According to some embodiments of this application, the division ratio of the first section and the second section is determined based on the outdoor ambient temperature.

[0075] According to some embodiments of this application, the temperature acquisition module 110 acquires the indoor ambient temperature, specifically for: acquiring the temperature sampling value of at least one temperature sensor installed indoors; and determining the indoor ambient temperature based on the at least one temperature sampling value.

[0076] According to some embodiments of this application, the temperature acquisition module 110 determines the indoor ambient temperature based on at least one temperature sampling value, specifically used for: when there are multiple temperature sampling values ​​and all of the multiple temperature sampling values ​​meet preset conditions, determining the indoor ambient temperature based on the average value of the multiple temperature sampling values; and when there is only one temperature sampling value and the preset conditions are met, using the temperature sampling value as the indoor ambient temperature.

[0077] It should be noted that for details not disclosed in the temperature control device of the combined air handling unit in the embodiments of this application, please refer to the details disclosed in the temperature control method of the combined air handling unit in the embodiments of this application, which will not be repeated here.

[0078] Corresponding to the above embodiments, this application also proposes a computer-readable storage medium.

[0079] The computer-readable storage medium of this application stores a temperature control program for a combined air handling unit, which, when executed by a processor, implements the temperature control method for the combined air handling unit described in the above embodiments.

[0080] Corresponding to the above embodiments, this application also proposes a combined air handling unit.

[0081] like Figure 4 As shown, the combined air handling unit 200 of this application includes a memory 210, a processor 220, and a temperature control program for the combined air handling unit stored in the memory 210 and run on the processor 220. When the processor executes the temperature control program for the combined air handling unit, it implements the temperature control method for the combined air handling unit in the above embodiments.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for temperature control of a combined air handling unit, characterized in that, The combined air handling unit includes: a cold water coil and a hot water coil, as well as a first electric valve corresponding to the cold water coil and a second electric valve corresponding to the hot water coil. The method includes: Get the indoor ambient temperature and the set temperature; The PI controller output value is determined based on the indoor ambient temperature and the set temperature. The first electric valve or the second electric valve is controlled according to the output value of the PI controller; The PI controller output value is determined based on the indoor ambient temperature and the set temperature, including: Obtain the temperature difference between the set temperature and the indoor ambient temperature; When the temperature difference is less than a set threshold, the PI controller output value is determined to be in the first segment to control the first electric valve; When the temperature difference is greater than the set threshold, the PI controller output value is determined to be in the second segment to control the second electric valve; The first segment and the second segment together constitute the output segment of the PI controller.

2. The temperature control method for the combined air handling unit according to claim 1, characterized in that, Controlling the first electric valve or the second electric valve according to the output value of the PI controller includes: When the PI controller output value is in the first range, the first PI controller output value is determined based on the temperature difference value, and the opening degree of the first electric valve is controlled based on the first PI controller output value. When the PI controller output value is in the second range, the second PI controller output value is determined based on the temperature difference, and the opening degree of the second electric valve is controlled based on the second PI controller output value.

3. The temperature control method for the combined air handling unit according to claim 2, characterized in that, The temperature difference is positively correlated with the output value of the PI controller, the output value of the first PI controller is negatively correlated with the opening degree of the first electric valve, and the output value of the second PI controller is positively correlated with the opening degree of the second electric valve.

4. The temperature control method for the combined air handling unit according to claim 1, characterized in that, The division ratio between the first section and the second section is determined based on the outdoor ambient temperature.

5. The temperature control method for the combined air handling unit according to claim 1, characterized in that, Obtain the indoor ambient temperature, including: Acquire temperature sampling values ​​from at least one temperature sensor installed indoors; The indoor ambient temperature is determined based on at least one of the temperature sample values.

6. The temperature control method for the combined air handling unit according to claim 5, characterized in that, Determining the indoor ambient temperature based on at least one of the temperature sample values ​​includes: When there are multiple temperature sampling values ​​and all of the multiple temperature sampling values ​​meet the preset conditions, the indoor ambient temperature is determined based on the average value of the multiple temperature sampling values. When the temperature sampling value is one and meets the preset condition, the temperature sampling value is taken as the indoor ambient temperature.

7. A temperature control device for a combined air handling unit, characterized in that, For implementing the temperature control method of the combined air handling unit according to any one of claims 1-6, the combined air handling unit includes: a cold water coil and a hot water coil, and a first electric valve corresponding to the cold water coil and a second electric valve corresponding to the hot water coil, the device comprising: The temperature acquisition module is used to acquire the indoor ambient temperature and the set temperature; The control module is used to determine the output value of the PI controller based on the indoor ambient temperature and the set temperature, and to control the first electric valve or the second electric valve based on the output value of the PI controller.

8. A computer-readable storage medium, characterized in that, It stores a temperature control program for the combined air handling unit, which, when executed by a processor, implements the temperature control method for the combined air handling unit according to any one of claims 1-6.

9. A combined air handling unit, characterized in that, The device includes a memory, a processor, and a temperature control program for a combined air handling unit stored in the memory and executable on the processor. When the processor executes the temperature control program for the combined air handling unit, it implements the temperature control method for the combined air handling unit according to any one of claims 1-6.

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