An energy-saving optimization control system and method for an end air-conditioning fan and a chilled water valve

Abstract

The present invention relates to an energy-saving optimization control system and method for an end-of-line air-conditioning fan and a chilled water valve, including a chilled water valve configured with a chilled water valve opening controller and a fan configured with a fan frequency converter. The fan can respectively transport fresh air and return air to each working area through pipelines. Temperature sensors are respectively arranged in each working area, and the chilled water valve opening controller and the temperature sensors are electrically connected to a PID module. The present invention flexibly adjusts the fan frequency and the chilled water valve opening under different working conditions to adapt to the actual use environment; by setting a reasonable duration threshold, it avoids the interference of instantaneous fluctuations on the control strategy, enhances the stability of the system, maximizes the chilled water valve opening, reduces the fan frequency, reduces the energy consumption of the end-of-line air-conditioning system, and promotes the application of building energy-saving and emission-reduction technologies and the realization of the dual-carbon goal on the premise of ensuring the temperature requirements of the working area.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning control, and particularly to an energy-saving optimization control system and method for an end-air-conditioning fan and a chilled water valve. Background Art

[0002] In a large working space, due to the large heat dissipation of equipment, the staff in the working space are faced with a long-term high-temperature environment, which triggers the need for effective regulation of the temperature in the working area. A common cooling strategy is to adopt the method of local air supply, which includes two key control objects: the fan frequency and the opening degree of the chilled water valve.

[0003] Currently, the traditional control methods are mainly divided into two types: one is to directly adjust the opening degree of the chilled water valve to achieve the regulation of the temperature in the working area; the other is to control the supply air temperature by adjusting the opening degree of the chilled water valve and control the temperature in the working area by adjusting the fan frequency. However, when adjusting the opening degree of the chilled water valve, the system needs a certain time to change the flow rate and temperature of the coolant, and there is a certain inertia, resulting in a relatively slow response speed of temperature regulation, which may cause large fluctuations in the temperature of the working area or untimely regulation. At the same time, controlling the opening degree of the chilled water valve and the fan may have an interference effect, thus affecting the effect of temperature regulation in the working area.

[0004] Therefore, an energy-saving optimization control strategy is needed, which can have the advantages of stable and reliable control and energy saving at the same time. On the premise of meeting the temperature requirements of the working area, the opening degree of the chilled water valve is maximized, the fan frequency is reduced, the energy consumption of the end-air-conditioning system is reduced, and the application of building energy-saving and emission-reduction technologies and the realization of the dual-carbon goal are promoted. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an energy-saving optimization control system and method for an end-air-conditioning fan and a chilled water valve according to the deficiencies of the above-mentioned prior art. According to different working conditions, the fan frequency and the opening degree of the chilled water valve are flexibly adjusted to adapt to the actual use environment, and on the premise of ensuring the temperature requirements of the working area, the operation energy consumption of the system is saved to the greatest extent.

[0006] The technical solution of the present invention for solving the above technical problem is as follows: An energy-saving optimization control system for an end-air-conditioning fan and a chilled water valve includes a chilled water valve configured with a chilled water valve opening controller and a fan configured with a fan frequency converter. The fan can respectively convey fresh air and return air to each working area through pipelines. A temperature sensor is respectively arranged in each working area. The chilled water valve opening controller and the temperature sensor are respectively electrically connected to the PID module;

[0007] The temperature sensors are respectively used to detect the average temperature in the corresponding working area in real time;

[0008] The PID module is used to calculate the output value of the chilled water valve opening according to the average temperature of the working area and the set value of the average temperature;

[0009] The chilled water valve opening controller is used to detect the opening feedback signal of the chilled water valve in real time, and feedback control the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the output value of the chilled water valve opening determined by the average temperature of the working area;

[0010] The fan frequency converter is used to detect the frequency feedback signal of the fan in real time, and control the fan to dynamically adjust its operating frequency according to the frequency feedback signal, the opening feedback signal, and the average temperature of the working area.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows:

[0012] Further: The specific implementation of the chilled water valve opening controller to feedback control the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the average temperature of the working area, and the fan frequency converter to feedback control the fan to dynamically adjust its operating frequency according to the frequency feedback signal and the opening feedback signal is as follows:

[0013] At the initial moment, the PID module calculates the initial output value U of the chilled water valve opening according to the initial average temperature T z0,t0 of the working area and the set value T z0,set of the average temperature; out,t0 The chilled water valve opening controller controls the chilled water valve to adjust its opening according to the initial output value U out,t0 of the chilled water valve opening;

[0014] At the current moment, the temperature of the working area is sampled according to the preset sampling time interval H s , and the average temperature T c of the working area at the current moment t z0,tc is calculated;

[0015] When the detected opening feedback signal U k ≥U up -a, and the current average temperature T z0,tc of the working area > T z0,set +△T, and the duration of both is greater than the set time t 1 , it is determined that the opening of the chilled water valve has reached the maximum value, and the real-time output value F out,tc of the fan frequency is fixed = F out,t0 +b, and the next sampling cycle control is entered;

[0016] When the detected opening feedback signal U mid <U k <Uup -a, and the duration is greater than the set time t 2 , then maintain the current value of the fan frequency output value F out,tc = F out,t0 unchanged, and enter the next sampling cycle control;

[0017] When the opening feedback signal U of the chilled water valve detected in real time k <= U mid , and the duration is greater than the set time t 3 , then adjust the fan frequency output value F out,tc = F out,t0 -c, and enter the next sampling cycle control;

[0018] When the detected opening feedback signal U in real time k >= U up -a, and the current average temperature T of the working area z0,tc < T z0,set + △T, and the durations of both are greater than the set time t 4 , then control the chilled water valve to reduce the opening according to the detected opening feedback signal U in real time k , while keeping the fan frequency output value F out unchanged, and enter the next sampling cycle control;

[0019] Wherein, a is the preset opening tolerance value, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance value.

[0020] The beneficial effect of the above further solution is: control the chilled water valve to adjust its opening through the initial output value U of the chilled water valve opening after initialization, and in the working process, collect the temperature of the working area in real time, and calculate the average temperature T of the working area at the current moment t out,t0 ; on the basis that the chilled water valve opening controller dynamically controls the opening of the chilled water valve according to the detected opening feedback signal U in real time and the chilled water valve opening output value determined by the average temperature of the working area, adjust the frequency of the fan according to different working conditions, so that the opening of the chilled water valve can be maximized, the fan frequency can be reduced, and the energy consumption of the terminal air conditioning system can be reduced on the premise of ensuring the temperature demand. c The average temperature T of the working area z0,tc ; further: the chilled water valve opening controller feedback-controls the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the average temperature of the working area, and the fan frequency converter feedback-controls the fan to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal, and further includes: k On the basis of ensuring the temperature demand, maximize the opening of the chilled water valve, reduce the fan frequency, and reduce the energy consumption of the terminal air conditioning system.

[0021] Further: the chilled water valve opening controller feedback-controls the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the average temperature feedback of the working area, and the fan frequency converter feedback-controls the fan to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal, and further includes:

[0022] When the opening output value U of the chilled water valve out,tc ≥U up , it is determined that the opening of the chilled water valve has reached the maximum value U up , and the opening output value U of the chilled water valve is fixed out,tc =U up . When the opening output value U of the chilled water valve out,tc ≤U down , it is determined that the opening of the chilled water valve has reached the minimum value U down , and the opening output value U of the chilled water valve is fixed out,tc =U down ;

[0023] When the fan frequency output signal F out,tc ≥F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F out,tc =F up is output. When the fan frequency output signal F out,tc ≤F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F out,tc =F down .

[0024] The beneficial effect of the above further solution is that when the opening output value U of the chilled water valve out,tc ≥U up or ≤U down , the opening of the chilled water valve has reached the maximum value U up or the minimum value U down . At this time, the opening adjustment of the chilled water valve reaches the limit. By fixing the opening output value U of the chilled water valve out =U up and F out =F down , efficiency and safety can be taken into account, energy consumption can be saved. Similarly, when the fan frequency output value F out,tc ≥F up or F out,tc ≤F down , the frequency of the fan has reached the maximum value F up or the minimum value F down . By fixing the fan frequency output value F ou,tc t =F up or F out,tc =F down , efficiency and safety can be taken into account, and the system energy consumption can be reduced on the premise of meeting the temperature requirements of the working area to the greatest extent.

[0025] The present invention also provides an energy-saving optimization control method for an end air-conditioning fan and a chilled water valve, including the following steps:

[0026] Real-time detect the average temperature in the corresponding working area;

[0027] Calculate the opening output value of the chilled water valve according to the average temperature in the working area and the set value of the average temperature;

[0028] The opening feedback signal of the chilled water valve is detected in real time by the opening controller of the chilled water valve, and the opening of the chilled water valve is feedback-controlled to dynamically adjust its opening according to the opening feedback signal and the opening output value of the chilled water valve determined by the average temperature in the working area;

[0029] The frequency feedback signal of the fan is detected in real time by the fan frequency converter, and the working frequency of the fan is controlled to dynamically adjust according to the frequency feedback signal, the opening feedback signal and the average temperature in the working area.

[0030] On the basis of the above technical solution, the present invention can also be improved as follows:

[0031] Further: the opening controller of the chilled water valve feedback-controls the opening of the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the opening output value of the chilled water valve determined by the average temperature in the working area, and the fan frequency converter controls the fan to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal, which specifically includes the following steps:

[0032] At the initial moment, the PID module calculates the initial opening output value U of the chilled water valve according to the initial average temperature T in the working area z0,t0 and the set value of the average temperature T z0,set ; the opening controller of the chilled water valve controls the opening of the chilled water valve to adjust according to the initial opening output value U of the chilled water valve out,t0 ; out,t0 Control the chilled water valve to adjust its opening;

[0033] At the current moment, sample the temperature in the working area according to the preset sampling time interval H s , and calculate the average temperature T in the working area at the current moment t c ; z0,tc ;

[0034] When the detected opening feedback signal U k ≥U up -a, and the current average temperature T in the working area z0,tc >T z0,set +△T, and the duration of both is greater than the set time t 1 , it is determined that the opening of the chilled water valve has reached the maximum value, and the real-time output value F of the fixed fan frequency is out,tc =F out,t0 +b, and enter the next sampling cycle control;

[0035] When the opening feedback signal U is detected in real time mid k up -a, and the duration is greater than the set time t 2 , then maintain the current fan frequency output value F out,tc =F out,t0 No change, and enter the next sampling cycle control;

[0036] When the real-time detected chilled water valve opening feedback signal U k <=U mid , and the duration is greater than the set time t 3 , then adjust the fan frequency output value F out,tc =F out,t0 -c, and enter the next sampling cycle control;

[0037] When the opening feedback signal U is detected in real time k >=U up -a, and the current average temperature T of the working area z0,tc <T z0,set +△T, the duration of both is greater than the set time t 4 , then according to the opening feedback signal U detected in real time k Control the chilled water valve to reduce its opening while maintaining the fan frequency output value F out No change, and enter the next sampling cycle control;

[0038] Wherein, a is the preset opening tolerance value, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance value.

[0039] The beneficial effect of the above further solution is: the initial output value U of the chilled water valve opening after initialization out,t0 Control the chilled water valve to adjust its opening, collect the temperature of the working area in real time during the working process, and calculate the current time t c Average temperature of the working area T z0,tc In the chilled water valve opening controller according to the real-time detection of the opening feedback signal U k On the basis of dynamically controlling the opening of the chilled water valve according to the output value of the chilled water valve opening determined by the average temperature of the working area, the frequency of the fan is adjusted according to different working conditions. In this way, the opening of the chilled water valve can be maximized while the fan frequency can be reduced, thereby reducing the energy consumption of the terminal air-conditioning system while ensuring the temperature requirement.

[0040] ​​Further: The chilled water valve opening controller feedback-controls the chilled water valve to dynamically adjust its opening according to the opening feedback signal and the output value of the chilled water valve opening determined by the average temperature of the working area. The fan frequency converter controls the fan to dynamically adjust its operating frequency according to the frequency feedback signal and the opening feedback signal. The method further includes the following steps:

[0041] When the output value U of the chilled water valve opening out,tc >=U up , it is determined that the opening of the chilled water valve has reached the maximum value U up , and the output value U of the chilled water valve opening is fixed out,tc =U up . When the output value U of the chilled water valve opening out,tc <=U down , it is determined that the opening of the chilled water valve has reached the minimum value U down , and the output value U of the chilled water valve opening is fixed out,tc =U down ;

[0042] When the fan frequency output signal F out,tc >=F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F out,tc =F up is output. When the fan frequency output signal F out,tc <=F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F out,tc =F down .

[0043] The beneficial effect of the above further solution is that when the output value U of the chilled water valve opening out,tc >=U up or <=U down , the opening of the chilled water valve has reached the maximum value U up or the minimum value U down . At this time, the opening adjustment of the chilled water valve reaches the limit. By fixing the output value U of the chilled water valve opening out =U up and F out =F down , efficiency and safety can be balanced, and energy consumption can be saved. Similarly, when the fan frequency output value F out,tc >=F up or F out,tc <=F down , the frequency of the fan has reached the maximum value F up or the minimum value F down . By fixing the fan frequency output value F ou,tc t =Fup or F out,tc = F down This can take into account both efficiency and safety, and reduce the system energy consumption on the premise of maximizing the satisfaction of the temperature requirements in the working area.

[0044] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the energy-saving optimization control method for the terminal air-conditioning fan and chilled water valve when executed.

[0045] The present invention also provides an energy-saving optimization control device for a terminal air-conditioning fan and a chilled water valve. The energy-saving optimization control device for the terminal air-conditioning fan and the chilled water valve includes:

[0046] At least one processor and a storage medium, and the storage medium is communicatively connected to the processor;

[0047] Wherein, a computer program executable by the at least one processor is stored on the storage medium, and the computer program is executed by the at least one processor so that the at least one processor can execute the energy-saving optimization control method for the terminal air-conditioning fan and the chilled water valve.

[0048] For the energy-saving optimization control system and method of the terminal air-conditioning fan and the chilled water valve of the present invention, the temperature sensors are used to collect the temperatures of the corresponding working areas respectively, calculate the average temperature of the working areas, and calculate the opening degree output value of the chilled water valve by the PID module according to the set value of the average temperature of the working areas, so as to adjust the air supply temperature of the fan and the average temperature of the working areas. According to the energy-saving optimization control strategy of the present invention, the fan frequency and the opening degree of the chilled water valve are flexibly adjusted under different working conditions to adapt to the actual use environment; by setting a reasonable duration threshold, the interference of instantaneous fluctuations to the control strategy is avoided, the stability of the system is enhanced, and on the premise of ensuring the temperature requirements of the working area, the opening degree of the chilled water valve is maximized, the fan frequency is reduced, the energy consumption of the terminal air-conditioning system is reduced, and the application of building energy-saving and emission-reduction technologies and the realization of the dual-carbon goal are promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic structural diagram of an energy-saving optimization control system for a terminal air-conditioning fan and a chilled water valve according to an embodiment of the present invention;

[0050] Figure 2 It is a schematic flowchart of an energy-saving optimization control method for a terminal air-conditioning fan and a chilled water valve according to an embodiment of the present invention.

[0051] In the drawings, the list of components represented by each reference numeral is as follows:

[0052] 1. Chilled water valve, 2. Chilled water valve opening controller, 3. Fan, 4. Fan frequency converter, 6. PID module, 7. First working area, 8. First temperature sensor, 9. Second working area, 10. Second temperature sensor. Detailed implementation

[0053] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0054] As Figure 1 shown, an energy-saving optimization control system for an end-air-conditioning fan and a chilled water valve includes a chilled water valve 1 configured with a chilled water valve opening controller 2 and a fan 3 configured with a fan frequency converter 4. The fan 3 can respectively convey fresh air and return air to a first working area 7 and a second working area 9 through pipelines. A first temperature sensor 8 and a second temperature sensor 10 are respectively arranged in the first working area 7 and the second working area 9. The chilled water valve opening controller 2, the first temperature sensor 8 and the second temperature sensor 10 are respectively electrically connected to the PID module 6.

[0055] The first temperature sensor 8 and the second temperature sensor 10 are respectively used to detect the average temperature in the corresponding first working area 7 and second working area 9 in real time;

[0056] The PID module 6 is used to calculate the chilled water valve opening output value according to the average temperature of the first working area 7 and the second working area 9 and the average temperature set value;

[0057] The chilled water valve opening controller 2 is used to detect the opening feedback signal of the chilled water valve 1 in real time, and feedback-control the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the chilled water valve opening output value determined by the average temperature of the first working area 7 and the second working area 9;

[0058] The fan frequency converter 4 is used to detect the frequency feedback signal of the fan 3 in real time, and control the fan 3 to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal.

[0059] According to the above implementation, the temperatures of the first working area 7 and the second working area 9 can be respectively collected in real time through the first temperature sensor 8 and the second temperature sensor 10, which is convenient for the subsequent PID module 6 to calculate the fan frequency output value and the chilled water valve opening output value according to the average temperature of the first working area 7 and the second working area 9 and the average temperature set value.

[0060] According to the above embodiments, the PID module 6 is used to collect the real-time operation data of the system. The operation data includes the temperature of the working area collected by the temperature sensor, and the operation frequency value of the chilled water valve 1 is obtained through optimized calculation. Further, the calculated operation frequency value is transmitted to the chilled water valve opening controller 2 through an electrical signal, and the chilled water valve opening controller 2 completes the adjustment of the working frequency of the chilled water valve 1, thereby adjusting the supply air temperature and the temperature of the working area.

[0061] In the embodiment of the present invention, the minimum value U of the chilled water valve opening is set down and is defaulted to 10%, the maximum value U of the chilled water valve opening is set up , and is defaulted to 98%. The lower limit F of the fan operation frequency is set down and is defaulted to 35 Hz. The middle limit F of the fan operation frequency is set mid and is defaulted to 40 Hz. The upper limit F of the fan operation frequency is set up and is defaulted to 48 Hz. The preset opening tolerance value a is taken as 2%, the preset frequency step increase value b is taken as 2 Hz, the preset frequency step decrease value c is taken as 2 Hz, the temperature tolerance value △T is defaulted to 0.5 °C, and the sampling time interval H s is defaulted to 15 s.

[0062] In addition, the calculation of the chilled water valve opening adopts the PID module 6, and this module calculates according to the average temperature T z0 of the working area and the average temperature set value T z0,set . The specific calculation method can adopt the existing PID algorithm. During the use of the PID module 6, in order to prevent the fan frequency and the chilled water valve opening from being adjusted frequently, a dead zone needs to be set; the setting of the dead zone ensures that the system does not make adjustments when the control signal changes little, thereby reducing the fluctuation of the system near the set value.

[0063] In one or more embodiments of the present invention, the chilled water valve opening controller 2 feedback-controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the average temperature feedback of the first working area 7 and the second working area 9, and the fan frequency converter 4 feedback-controls the fan 3 to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal. The specific implementation is as follows:

[0064] At the initial moment, the PID module 6 calculates the initial output value U of the chilled water valve opening according to the initial average temperature T z0,t0 of the first working area 7 and the second working area 9 and the average temperature set value T z0,set ; the chilled water valve opening controller 2 controls the chilled water valve 1 to adjust its opening according to the initial output value U of the chilled water valve opening out,t0 ; out,t0

[0065] ​After initialization is completed, the chilled water valve opening controller 2 dynamically controls the opening of the chilled water valve 1 according to the opening feedback signal U detected in real time k and the output value of the chilled water valve opening determined by the average temperature of the working area. At the same time, the first temperature sensor 8 and the second temperature sensor 10 respectively sample the temperatures of the first working area 7 and the second working area 9, and enter the subsequent control process

[0066] At the current moment, according to the preset sampling time interval H s sample the temperatures of the first working area 7 and the second working area 9, and calculate the average temperature T of the first working area 7 and the second working area 9 at the current moment t c ; At this time, the chilled water valve opening PID module 6 always remains in an operating state z0,tc ;

[0067] 1. When the detected opening feedback signal U in real time k >=U up -2%, and the current average temperature T of the first working area 7 and the second working area 9 z0,tc >T z0,set +0.5, and the duration of both is greater than the set time t 1 (default 5min), it indicates that the opening of the chilled water valve has reached the maximum value and lasted for a period of time, but the temperature of the working area cannot reach the set value. Then it is determined that the opening of the chilled water valve has reached the maximum value, and the real-time output value F of the fan frequency is fixed out,tc =F out,t0 +2, and enter the next sampling cycle control

[0068] 2. When the detected opening feedback signal U in real time mid <U k <U up -2%, and the duration is greater than the set time t 2 , then maintain the current value of the fan frequency output value F out,tc =F out,t0 unchanged, and enter the next sampling cycle control

[0069] 3. When the detected chilled water valve opening feedback signal U in real time k <=U mid , and the duration is greater than the set time t 3 , it indicates that the temperature of the working area can be satisfied and lasts for a period of time when the opening of the chilled water valve is small. Adjust the fan frequency output value F out,tc =F out,t0 -2, and enter the next sampling cycle control

[0070] 4. When the detected opening feedback signal U in real time k >=Uup -2%, and the current average temperature T of the first working area 7 and the second working area 9 z0,tc < T z0,set +0.5, and the duration of both is greater than the set time t 4 , then according to the opening feedback signal U detected in real time k control the chilled water valve 1 to reduce the opening, and at the same time keep the fan frequency output value F out unchanged, and enter the next sampling cycle control;

[0071] Except for the above 4 cases, the opening of the chilled water valve 1 is dynamically and independently controlled by the chilled water valve opening controller 2 according to the opening feedback signal U detected in real time k and the opening output value of the chilled water valve determined by the average temperature of the working area, using the existing PI closed-loop feedback control algorithm. In this case, the fan 3 works at the initial default frequency and is not affected by the opening feedback signal. Refer to the second case above.

[0072] Among them, a is the preset opening tolerance, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance.

[0073] Through the initial output value U of the chilled water valve opening after initialization out,t0 control the chilled water valve 1 to adjust its opening, and in the working process, collect the temperatures of the first working area 7 and the second working area 9 in real time, and calculate the current moment t c The average temperature T of the first working area 7 and the second working area 9 z0,tc ; On the basis that the chilled water valve opening controller 2 dynamically controls the opening of the chilled water valve 1 according to the opening feedback signal U detected in real time k and the opening output value of the chilled water valve determined by the average temperature of the first working area 7 and the second working area 9, adjust the frequency of the fan 3 according to different working conditions. In this way, on the premise of ensuring the temperature demand, the opening of the chilled water valve can be maximized, the fan frequency can be reduced, and the energy consumption of the terminal air conditioning system can be reduced.

[0074] Specifically, in the above third case, if the opening feedback signal U of the chilled water valve detected in real time k <= U mid , and the duration is greater than the set time t 3 When, if the fan frequency output value F is adjusted through several cycles out,tc = F out,t0 -c, so that the fan frequency output value F out,tc <= F down , then fix the fan frequency output value F out,tc = F down, and the chilled water valve opening controller 2 has been running independently and continuously. Therefore, at this time, the chilled water valve opening controller 2 dynamically and independently controls the reduction of the opening of the chilled water valve 1 according to the opening feedback signal U detected in real time k and the output value of the chilled water valve opening determined by the average temperature of the working area.

[0075] It should be noted that theoretically, the opening feedback signal U of the chilled water valve detected in real time may appear k <=U mid , and the real-time average temperature T of the working area z0,tc >T z0,set +△T, and the duration of both is greater than the set time t 5 . However, in practice, due to the fact that when the opening feedback signal U of the chilled water valve k <=U mid , the chilled water valve opening controller 2 dynamically and independently controls the opening of the chilled water valve 1 according to the opening feedback signal U detected in real time k and the output value of the chilled water valve opening determined by the average temperature of the working area. At this time, due to feedback control, if the real-time average temperature T z0,tc >T z0,set +△T, then the opening feedback signal U of the chilled water valve at this time k cannot be less than or equal to U mid . Therefore, this situation is impossible to occur in practice.

[0076] In one or more embodiments of the present invention, the chilled water valve opening controller 2 feedback-controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the average temperature feedback of the first working area 7 and the second working area 9. The fan frequency converter 4 feedback-controls the fan 3 to dynamically adjust its operating frequency according to the frequency feedback signal and the opening feedback signal, and further includes:

[0077] When the output value U of the chilled water valve opening out,tc >=U up , it is determined that the opening of the chilled water valve has reached the maximum value U up , and the output value U of the chilled water valve opening is fixed out,tc =U up . When the output value U of the chilled water valve opening out,tc <=U down , it is determined that the opening of the chilled water valve has reached the minimum value U down , and the output value U of the chilled water valve opening is fixed out,tc =U down . When the output value U of the chilled water valve opening out,tc >=U up or <=U down , then the opening of the chilled water valve has reached the maximum value Uup or the minimum value U down , at this time, the opening adjustment of the chilled water valve reaches the limit. By fixing the output value U of the chilled water valve opening out = U up and F out = F down , the efficiency and safety can be taken into account and the energy consumption can be saved.

[0078] When the fan frequency output signal F out,tc >= F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F out,tc = F up is output. When the fan frequency output signal F out,tc <= F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F out,tc = F down is output. Similarly, when the fan frequency output value F out,tc >= F up or F out,tc <= F down , the frequency of the fan has reached the maximum value F up or the minimum value F down . By fixing the fan frequency output value F ou,tc t = F up or F out,tc = F down , the efficiency and safety can be taken into account, and the system energy consumption can be reduced on the premise of meeting the temperature requirements of the working area to the greatest extent.

[0079] As Figure 2 shown, the present invention also provides an energy-saving optimization control method for an end air-conditioning fan and a chilled water valve, including the following steps:

[0080] S1: Real-time detect the average temperatures in the corresponding first working area 7 and second working area 9;

[0081] S2: Calculate the output value of the chilled water valve opening according to the average temperatures of the first working area 7 and the second working area 9 and the average temperature setting value;

[0082] S3: The chilled water valve opening controller 2 real-time detects the opening feedback signal of the chilled water valve 1, and feedback-controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the output value of the chilled water valve opening determined by the average temperatures of the first working area 7 and the second working area 9;

[0083] S4: The fan inverter 4 detects the frequency feedback signal of the fan 3 in real time, and controls the fan 3 to dynamically adjust its operating frequency according to the frequency feedback signal and the opening feedback signal.

[0084] In one or more embodiments of the present invention, the chilled water valve opening controller 2 controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the chilled water valve opening output value feedback determined by the average temperature of the first working area 7 and the second working area 9, and the fan inverter 4 controls the fan 3 to dynamically adjust its operating frequency according to the frequency feedback signal and the opening feedback signal, specifically including the following steps:

[0085] At the initial moment, the PID module 6 determines the initial average temperature T of the first working area 7 and the second working area 9 according to the initial average temperature T z0,t0 and the average temperature setting value T z0,set Calculate the initial output value U of the chilled water valve opening out,t0 The chilled water valve opening controller 2 outputs the initial value U of the chilled water valve opening according to the out,t0 Controlling the chilled water valve 1 to adjust its opening;

[0086] At this moment, according to the preset sampling time interval H s Sample the temperature of the first working area 7 and the second working area 9, and calculate the current time t c Average temperature of the working area T z0,tc ;

[0087] 1. When the opening feedback signal U detected in real time k >=U up -2%, and the current average temperature T of the first working area 7 and the second working area 9 z0,tc >T z0,set +0.5, the duration of both is greater than the set time t 1 , it is determined that the chilled water valve opening has reached the maximum value, and the fan frequency real-time output value F is fixed out,tc =F out,t0 +2, and enter the next sampling cycle control;

[0088] 2. When the opening feedback signal U detected in real time mid k up -2%, and the duration is greater than the set time t 2 , then maintain the current fan frequency output value F out,tc =F out,t0 No change, and enter the next sampling cycle control;

[0089] 3. When the real-time detected chilled water valve opening feedback signal U k <=U​​mid and the duration is greater than the set time t 3 , then adjust the fan frequency output value F out,tc = F out,t0 - 2, and enter the next sampling cycle control;

[0090] 4. When the detected opening feedback signal U in real time k >= U up - 2%, and the current average temperature T of the first working area 7 and the second working area 9 z0,tc < T z0,set + 0.5, and the duration of both is greater than the set time t 4 , then control the chilled water valve 1 to reduce the opening according to the detected opening feedback signal U in real time k , while keeping the fan frequency output value F out unchanged, and enter the next sampling cycle control;

[0091] Wherein, a is the preset opening tolerance, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance.

[0092] Control the chilled water valve 1 to adjust its opening through the initial output value U of the chilled water valve opening after initialization, and collect the temperatures of the first working area 7 and the second working area 9 in real time during the working process, and calculate the average temperature T of the first working area 7 and the second working area 9 at the current moment t out,t0 ; On the basis that the chilled water valve opening controller 2 dynamically controls the opening of the chilled water valve 1 according to the detected opening feedback signal U and the chilled water valve opening output value determined by the average temperature of the first working area 7 and the second working area 9, adjust the frequency of the fan 3 according to different working conditions, so that the opening of the chilled water valve can be maximized, the fan frequency can be reduced, and the energy consumption of the terminal air conditioning system can be reduced on the premise of ensuring the temperature demand. c The average temperature T of the first working area 7 and the second working area 9 z0,tc ; On the basis that the chilled water valve opening controller 2 feedback-controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the chilled water valve opening output value determined by the average temperature of the first working area 7 and the second working area 9, and the fan frequency converter 4 controls the fan 3 to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal, the following steps are further included: k When the chilled water valve opening output value U

[0093] In one or more embodiments of the present invention, the chilled water valve opening controller 2 feedback-controls the chilled water valve 1 to dynamically adjust its opening according to the opening feedback signal and the chilled water valve opening output value determined by the average temperature of the first working area 7 and the second working area 9, and the fan frequency converter 4 controls the fan 3 to dynamically adjust its working frequency according to the frequency feedback signal and the opening feedback signal, and further includes the following steps:

[0094] When the chilled water valve opening output value U out,tc >= U up , it is determined that the opening of the chilled water valve has reached the maximum value U up, fix the chilled water valve opening output value U out,tc = U up , when the chilled water valve opening output value U out,tc <= U down , it is determined that the chilled water valve opening has reached the minimum value U down , fix the chilled water valve opening output value U out,tc = U down . When the chilled water valve opening output value U out,tc >= U up or <= U down , then the chilled water valve opening has reached the maximum value U up or the minimum value U down , at this time, the opening adjustment of the chilled water valve reaches the limit. By fixing the chilled water valve opening output value U out = U up and F out = F down , efficiency and safety can be balanced and energy consumption can be saved.

[0095] When the fan frequency output signal F out,tc >= F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F out,tc = F up is output. When the fan frequency output signal F out,tc <= F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F out,tc = F down . Similarly, when the fan frequency output value F out,tc >= F up or F out,tc <= F down , then the frequency of the fan has reached the maximum value F up or the minimum value F down , by fixing the fan frequency output value F ou,tc t = F up or F out,tc = F down , efficiency and safety can be balanced, and system energy consumption can be reduced on the premise of meeting the working area temperature requirements to the greatest extent.

[0096] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the energy-saving optimization control method for the terminal air-conditioning fan and chilled water valve when executed.

[0097] The present invention also provides an energy-saving optimization control device for an end-of-line air-conditioning fan and a chilled water valve. The energy-saving optimization control device for the end-of-line air-conditioning fan and the chilled water valve includes:

[0098] At least one processor and a storage medium, the storage medium being communicatively connected to the processor;

[0099] Wherein, a computer program executable by the at least one processor is stored on the storage medium, and the computer program is executed by the at least one processor so that the at least one processor can execute the energy-saving optimization control method for the end-of-line air-conditioning fan and the chilled water valve.

[0100] For the energy-saving optimization control system and method of the end-of-line air-conditioning fan and the chilled water valve of the present invention, the temperatures of the corresponding first working area 7 and second working area 9 are respectively collected by the temperature sensor, and the average temperatures of the first working area 7 and the second working area 9 are calculated. According to the average temperature set values of the first working area 7 and the second working area 9, the opening degree output value of the chilled water valve is calculated by the PID module 6, so as to adjust the air supply temperature of the fan 3 and the average temperature of the working area. According to the energy-saving optimization control strategy of the present invention, the fan frequency and the opening degree of the chilled water valve are flexibly adjusted under different working conditions to adapt to the actual use environment; by setting a reasonable duration threshold, the interference of instantaneous fluctuations to the control strategy is avoided, and the stability of the system is enhanced. On the premise of ensuring the temperature requirements of the working area, the opening degree of the chilled water valve is maximized, the fan frequency is reduced, the energy consumption of the end-of-line air-conditioning system is reduced, and the application of building energy-saving and emission-reduction technologies and the realization of the dual-carbon goal are promoted.

[0101] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy-saving optimization control system for terminal air-conditioning fans and chilled water valves, characterized in that: It comprises a chilled water valve (1) equipped with a chilled water valve opening controller (2) and a fan (3) equipped with a fan frequency converter (4), wherein the fan (3) can respectively deliver fresh air and return air to each working area through a pipeline, and each working area is respectively provided with a temperature sensor, and the chilled water valve opening controller (2) and the temperature sensor are respectively electrically connected to a PID module (6); The temperature sensors are respectively used to detect the average temperature in the corresponding working area in real time; The PID module (6) is used to calculate the chilled water valve opening output value U according to the average temperature of the working area and the average temperature setting value. out,tc ; The chilled water valve opening controller (2) is used to detect the opening feedback signal U of the chilled water valve (1) in real time. k , and according to the opening feedback signal U k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Feedback controlling the chilled water valve (1) to dynamically adjust its opening; The fan frequency converter (4) is used to detect the frequency feedback signal of the fan (3) in real time, and according to the frequency feedback signal and the opening feedback signal U k and the average temperature of the working area controls the fan (3) to dynamically adjust its operating frequency; The chilled water valve opening controller (2) is configured to generate a plurality of opening feedback signals according to the opening feedback signal U k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Feedback control is used to dynamically adjust the opening of the chilled water valve (1), and the fan inverter (4) is used to dynamically adjust the opening of the chilled water valve (1) according to the frequency feedback signal and the opening feedback signal U k The specific implementation of controlling the fan (3) to dynamically adjust its operating frequency is as follows: At the initial moment, the PID module (6) is set according to the initial average temperature T of the working area. z0,t0 and the average temperature setting value T z0,set Calculate the initial output value U of the chilled water valve opening out,t0 The chilled water valve opening controller (2) outputs the initial value U of the chilled water valve opening according to the out,t0 Controlling the chilled water valve (1) to adjust its opening; At this moment, according to the preset sampling time interval H s Sample the temperature of the working area and calculate the current time t c Average temperature of the working area T z0,tc ; When the opening feedback signal U is detected in real time k Meet U k >=U up -a, and the current average temperature T of the working area z0,tc >T z0,set +△T, if the duration of both is greater than the set time t1, it is determined that the opening of the chilled water valve has reached the maximum value, and the real-time output value of the fan frequency F is fixed out,tc =F out,t0 +b, and enter the next sampling cycle control; When the opening feedback signal U is detected in real time k Meet U mid k up -a, and the duration is greater than the set time t2, then maintain the current fan frequency output value F out,tc =F out,t0 No change, and enter the next sampling cycle control;​​ When the real-time detected chilled water valve opening feedback signal U k Meet U k <=U mid , and the duration is greater than the set time t3, then adjust the fan frequency output value F out,tc =F out,t0 -c, and enter the next sampling cycle control; When the opening feedback signal U is detected in real time k Meet U k >=U up -a, and the current average temperature T of the working area z0,tc <T z0,set +△T, the duration of both is greater than the set time t4, then according to the real-time detection of the opening feedback signal U k Control the chilled water valve (1) to reduce its opening degree while maintaining the fan frequency output value F out No change, and enter the next sampling cycle control; Wherein, a is the preset opening tolerance value, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance value.

2. The terminal air conditioning fan and chilled water valve energy-saving optimization control system according to claim 1 is characterized in that: The chilled water valve opening controller (2) is configured to generate a plurality of opening feedback signals according to the opening feedback signal U k The average temperature of the working area is fed back to control the chilled water valve (1) to dynamically adjust its opening, and the fan inverter (4) is controlled according to the frequency feedback signal and the opening feedback signal U k Feedback control of the fan (3) to dynamically adjust its operating frequency also includes: When the chilled water valve opening output value U out,tc Meet U out,tc >=U up , it is determined that the chilled water valve opening has reached the maximum value U up , fix the chilled water valve opening output value U out,tc =U up , when the chilled water valve opening output value U out,tc Meet U out,tc <=U down , it is determined that the opening of the chilled water valve has reached the minimum value U down , fix the chilled water valve opening output value U out,tc =U down ; When the fan frequency output signal F out,tc >=F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F is output. out,tc =F up , when the fan frequency output signal F out,tc <=F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F is output. out,tc =F down .

3. A method for optimizing energy saving and control of terminal air conditioning fans and chilled water valves, characterized in that: The steps include: Real-time detection of the average temperature in the corresponding working area; Calculate the chilled water valve opening output value U according to the average temperature of the working area and the average temperature setting value out,tc ; The chilled water valve opening controller (2) detects the opening feedback signal U of the chilled water valve (1) in real time. k , and according to the opening feedback signal U k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Feedback controlling the chilled water valve (1) to dynamically adjust its opening; The fan frequency converter (4) detects the frequency feedback signal of the fan (3) in real time, and k and the average temperature of the working area controls the fan (3) to dynamically adjust its operating frequency; The chilled water valve opening controller (2) is configured to generate a plurality of opening feedback signals according to the opening feedback signal U k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Feedback control is used to dynamically adjust the opening of the chilled water valve (1), and the fan inverter (4) is used to dynamically adjust the opening of the chilled water valve (1) according to the frequency feedback signal and the opening feedback signal U k Controlling the fan (3) to dynamically adjust its operating frequency specifically comprises the following steps: At the initial moment, the PID module (6) is based on the initial average temperature T of the working area. z0,t0 and the average temperature setting value T z0,set Calculate the initial output value U of the chilled water valve opening out,t0 The chilled water valve opening controller (2) outputs the initial value U of the chilled water valve opening according to the out,t0 Controlling the chilled water valve (1) to adjust its opening; At this moment, according to the preset sampling time interval H s Sample the temperature of the working area and calculate the current time t c Average temperature of the working area T z0,tc ; When the opening feedback signal U is detected in real time k Meet U k >=U up -a, and the current average temperature T of the working area z0,tc >T z0,set +△T, if the duration of both is greater than the set time t1, it is determined that the opening of the chilled water valve has reached the maximum value, and the real-time output value of the fan frequency F is fixed out,tc =F out,t0 +b, and enter the next sampling cycle control; When the opening feedback signal U is detected in real time k Meet U mid k up -a, and the duration is greater than the set time t2, then maintain the current fan frequency output value F out,tc =F out,t0 No change, and enter the next sampling cycle control;​​ When the real-time detected chilled water valve opening feedback signal U k Meet U k <=U mid , and the duration is greater than the set time t3, then adjust the fan frequency output value F out,tc =F out,t0 -c, and enter the next sampling cycle control; When the opening feedback signal U is detected in real time k Meet U k >=U up -a, and the current average temperature T of the working area z0,tc <T z0,set +△T, the duration of both is greater than the set time t4, then according to the real-time detection of the opening feedback signal U k Control the chilled water valve (1) to reduce its opening degree while maintaining the fan frequency output value F out No change, and enter the next sampling cycle control; In other cases, the opening feedback signal U detected in real time is k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Dynamically controlling the opening of the chilled water valve (1); Wherein, a is the preset opening tolerance value, b is the preset frequency step increase value, c is the preset frequency step decrease value, and △T is the temperature tolerance value.

4. The energy-saving optimization control method for the terminal air-conditioning fan and the chilled water valve according to claim 3 is characterized in that: The chilled water valve opening controller (2) is configured to generate a plurality of opening feedback signals according to the opening feedback signal U k and the chilled water valve opening output value U determined by the average temperature of the working area out,tc Feedback control is used to dynamically adjust the opening of the chilled water valve (1), and the fan inverter (4) is used to dynamically adjust the opening of the chilled water valve (1) according to the frequency feedback signal and the opening feedback signal U k Controlling the fan (3) to dynamically adjust its operating frequency also includes the following steps: When the freezing water valve opening output value U out,tc Meet U out,tc >=U up , it is determined that the chilled water valve opening has reached the maximum value U up , fix the freezing water valve opening output value U out,tc =U up , when the freezing water valve opening output value U out,tc Meet U out,tc <=U down , it is determined that the opening of the chilled water valve has reached the minimum value U down , fix the freezing water valve opening output value U out,tc =U down ; When the fan frequency output signal F out,tc >=F up , it is considered that the fan frequency has reached the maximum value, and the fan frequency signal F is output. out,tc =F up , when the fan frequency output signal F out,tc <=F down , it is considered that the fan frequency has reached the minimum value, and the fan frequency signal F is output. out,tc =F down .

5. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the processor to implement the energy-saving optimization control method for the terminal air-conditioning fan and the chilled water valve according to any one of claims 3-4 when executed.

6. A terminal air conditioning fan and chilled water valve energy-saving optimization control device, characterized in that: The terminal air conditioning fan and chilled water valve energy-saving optimization control equipment includes: at least one processor and a storage medium, the storage medium being communicatively connected to the processor; Wherein, the storage medium stores a computer program that can be executed by at least one of the processors, and the computer program is executed by the at least one processor so that the at least one processor can execute the energy-saving optimization control method for the terminal air-conditioning fan and chilled water valve described in any one of claims 3-4.

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