CN114396718B - Full-air variable air volume system control method and device, electronic equipment and storage medium - Google Patents

Full-air variable air volume system control method and device, electronic equipment and storage medium Download PDF

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Publication number
CN114396718B
CN114396718B CN202210089446.0A CN202210089446A CN114396718B CN 114396718 B CN114396718 B CN 114396718B CN 202210089446 A CN202210089446 A CN 202210089446A CN 114396718 B CN114396718 B CN 114396718B
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air
air volume
preset
set value
variable
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CN114396718A (en
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邓杰文
魏庆芃
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Tsinghua University
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Tsinghua University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The application discloses a control method and device of an all-air variable air volume system, electronic equipment and a storage medium, wherein a sensor installed in the all-air variable air volume system is utilized, on the basis of not additionally installing sensor hardware equipment, the functions of optimally setting the air supply temperature set value and the air supply duct static pressure set value of an air conditioner box are realized through monitoring the actual operation parameters of return air temperature, air valve opening, air volume and the like of all the all-air variable air volume box units at the tail end in real time and through the proposed control logic. The full-air variable air volume system automatically adjusts and optimizes the operation set value according to the actual cooling demand under different operation working conditions in the cooling season, thereby maintaining high-efficiency operation for a long time and reducing the operation energy consumption of the full-air variable air volume system. Therefore, the problems that in the actual operation process, the air supply temperature set value and the static pressure set value are unreasonable, the system runs with high energy consumption, or the construction effect of the tail end environment is poor and the like are solved.

Description

Full-air variable air volume system control method and device, electronic equipment and storage medium
Technical Field
The present disclosure relates to the field of automatic control technologies for air conditioning systems, and in particular, to a method and an apparatus for controlling an all-air variable air volume system, an electronic device, and a storage medium.
Background
In large-scale and high-grade office buildings, the tail end of an air conditioner usually adopts an all-air variable air volume system so as to meet the requirement of independent adjustment of users and improve the environment construction effect. The power consumption of a fan at the tail end of the full-air variable air volume system accounts for a large proportion of the total power consumption of the building, even is close to the energy consumption of a cold station, and can account for 15% -30% of the total power consumption and account for 50% of the power consumption of an air conditioning system.
The full-air variable air volume system has high logic requirements on automatic control, the air supply temperature reaches a set value by adjusting the opening degree of a water valve, and the static pressure of an air supply duct reaches the set value by adjusting the frequency of a fan, so that the decoupling control effect of the air supply temperature and the air supply volume is realized. Therefore, the values of the air supply temperature set value and the static pressure set value directly influence the operation energy consumption and the environment construction effect of the full-air variable air volume system.
In the actual operation process, the related art often has the condition that the air supply temperature set value and the static pressure set value are unreasonable, which leads to high energy consumption operation of the system or poor construction effect of the tail end environment. Particularly, for different operation conditions in cold seasons, the related technology cannot realize real-time and automatic adjustment of an air supply temperature set value and a static pressure set value according to the changed cooling demand, and cannot enable the full-air variable air volume system to maintain efficient operation for a long time so as to reduce the operation energy consumption of the full-air variable air volume system, and a solution is needed.
Disclosure of Invention
The application provides a control method and device for an all-air variable air volume system, electronic equipment and a storage medium, so that the all-air variable air volume system can realize real-time and automatic adjustment of an air supply temperature set value and a static pressure set value according to changes of cooling demands for different operation working conditions in cold seasons, the all-air variable air volume system can maintain efficient operation for a long time, and the operation energy consumption of the all-air variable air volume system is reduced.
An embodiment of a first aspect of the present application provides a method for controlling a full-air variable air volume system, including the following steps: collecting the opening degree and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of a fan; comparing the opening degree and the return air temperature of all variable air volume box air valves with a preset air valve opening degree and a preset return air temperature, and determining the number of to-be-modulated air volume boxes meeting a first preset operation condition in the current operation state according to a compared first comparison result; and comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, determining a control strategy of the all-air variable air volume system according to a second comparison result after comparison, and controlling the all-air variable air volume system to execute the control strategy.
Optionally, in an embodiment of the present application, before acquiring the opening degree and the return air temperature of all variable air volume box air valves in the full air variable air volume system and the current operating frequency of the fan, the method further includes: and initializing a static pressure set value, an air supply temperature set value and a set variable air box air volume lower limit set value in the full-air variable air volume system.
Optionally, in an embodiment of the present application, the comparing the opening degree and the return air temperature of the total variable air volume box air volume with the preset opening degree and the preset return air temperature of the air volume box, and determining the number of the to-be-modulated air volume boxes meeting the first preset operation condition in the current operation state according to the compared first comparison result includes: and counting the opening degree of the variable air volume box air valve is equal to the preset opening degree of the air valve, and determining the number of the variable air volume boxes with the preset air return temperature difference value larger than the preset temperature difference to be subjected to modulation.
Optionally, in an embodiment of the present application, the comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, and determining the control strategy of the all-air variable air volume system according to a second comparison result after the comparing includes: when the number of the air volume boxes to be modulated is larger than the maximum value of the number of preset variable air volume boxes and the current operating frequency of the fan is smaller than the maximum value of the preset fan operating frequency, the static pressure set value is adjusted upwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is greater than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is greater than or equal to the maximum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards; when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is less than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is less than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and increasing the air supply temperature set value; and if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged.
Optionally, in an embodiment of the present application, the controlling the all-air variable air volume system to execute the control strategy includes: adjusting the fan frequency in the full-air variable air volume system to enable the static pressure value of the air delivery duct to be the static pressure set value in the adjustment strategy; and adjusting the opening of a water valve of a surface air cooler in the full-air variable air volume system to enable the air supply temperature to be the set value of the air supply temperature in the adjustment strategy.
An embodiment of a second aspect of the present application provides a full-air variable air volume system control device, including: the acquisition module is used for acquiring the opening degree and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of the fan; the comparison module is used for comparing the opening and the return air temperature of all the variable air volume box air valves with the preset air valve opening and the preset return air temperature, and determining the number of the to-be-modulated air volume boxes meeting the first preset operation condition in the current operation state according to the compared first comparison result; and the control module is used for comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, determining a control strategy of the all-air variable air volume system according to a second comparison result after comparison, and controlling the all-air variable air volume system to execute the control strategy.
Optionally, in an embodiment of the present application, the method further includes: and the initialization module is used for initializing a static pressure set value, an air supply temperature set value and a set variable air box air volume lower limit set value in the full-air variable air volume system.
Optionally, in an embodiment of the present application, the comparison module is specifically configured to count the variable air volume box air valve opening equals to the preset air valve opening, and the return air temperature and the variable air volume box number of the preset return air temperature difference value greater than the preset temperature difference are determined to be the number of the to-be-modulated air volume boxes.
Optionally, in an embodiment of the present application, the control module is specifically configured to, when the number of the to-be-modulated air volume boxes is greater than a maximum value of a preset number of variable air volume boxes, and a current operating frequency of the fan is less than the maximum value of a preset fan operating frequency, adjust the static pressure setting value upward, and keep a current supply air temperature setting value unchanged; when the number of the air volume boxes to be modulated is greater than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is greater than or equal to the maximum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards; when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is less than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is less than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and increasing the air supply temperature set value; and if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged.
Optionally, in an embodiment of the present application, the control module further includes: the optimization unit is used for enabling the static pressure value of the air delivery duct to be the static pressure set value in the adjustment strategy by adjusting the fan frequency in the full-air variable air volume system; and the adjusting unit is used for adjusting the opening degree of a water valve of a surface cooler in the full-air variable air volume system so as to enable the air supply temperature to be the set value of the air supply temperature in the adjusting strategy.
An embodiment of a third aspect of the present application provides an electronic device, including: the system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to execute the control method of the full-air variable air volume system according to the embodiment.
A fourth aspect of the present application provides a computer-readable storage medium, having a computer program stored thereon, where the computer program is executed by a processor to perform the control method of an all-air variable air volume system as described in the above embodiments.
Therefore, the application has at least the following beneficial effects:
on the basis of not installing sensor hardware, the current running state of the system is determined by monitoring the existing sensor of the full-air variable air volume system. And then adjusting and resetting the air supply temperature set value, the static pressure set value and the air volume lower limit set value of the variable air volume box of the full-air variable air volume system according to the difference between the air return temperature and the air return temperature set value of the area in charge of all variable air volume boxes at the tail end. And then, the static pressure value of the air supply duct reaches a static pressure set value by adjusting the frequency of the fan, and the air supply temperature reaches an air supply temperature set value by adjusting the opening of a water valve of the surface cooler. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the real-time and automatic adjustment of an air supply temperature set value and a static pressure set value is realized under different operation working conditions of the full-air variable air volume system in a cooling season according to the changed cooling demand, the full-air variable air volume system maintains efficient operation for a long time, and the operation energy consumption of the full-air variable air volume system is reduced. Therefore, the problems that in the actual operation process, the air supply temperature set value and the static pressure set value are unreasonable, the system runs with high energy consumption, or the terminal environment building effect is poor and the like are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a control method for a full-air variable air volume system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a control system of a full-air variable air volume system according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an execution logic of a control method for an all-air variable air volume system according to an embodiment of the present application;
fig. 4 is an exemplary diagram of a control device of a full-air variable air volume system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Description of reference numerals: an acquisition module-100, a comparison module-200, a control module-300, a memory-501, a processor-502 and a communication interface-503.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a method, an apparatus, an electronic device, and a storage medium for controlling an all-air variable air volume system according to an embodiment of the present application with reference to the accompanying drawings. In order to solve the problems mentioned in the background technology, the application provides a control method of an all-air variable air volume system. And then adjusting and resetting the air supply temperature set value, the static pressure set value and the air volume lower limit set value of the variable air volume box of the full-air variable air volume system according to the difference between the air return temperature and the air return temperature set value of the area in charge of all variable air volume boxes at the tail end. And then, the static pressure value of the air supply duct reaches a static pressure set value by adjusting the frequency of the fan, and the air supply temperature reaches an air supply temperature set value by adjusting the opening of a water valve of the surface cooler. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the real-time and automatic adjustment of an air supply temperature set value and a static pressure set value is realized under different operation working conditions of the full-air variable air volume system in a cooling season according to the changed cooling demand, the full-air variable air volume system maintains efficient operation for a long time, and the operation energy consumption of the full-air variable air volume system is reduced. Therefore, the problems that in the actual operation process, the air supply temperature set value and the static pressure set value are unreasonable, the system runs with high energy consumption, or the construction effect of the tail end environment is poor and the like are solved.
Specifically, fig. 1 is a flowchart of a control method of an all-air variable air volume system according to an embodiment of the present application.
As shown in fig. 1, the control method of the total air variable air volume system comprises the following steps:
in step S101, the opening and return air temperature of all variable air volume box air valves and the current operating frequency of the fan in the full air variable air volume system are collected.
In an embodiment of the application, the above-mentioned all-air variable air volume system includes a fresh air duct unit, a return air duct unit, a filter unit, a surface air cooler unit, a blower unit, a supply air duct unit, a variable air volume box unit, and a control box unit. The fresh air duct unit is connected with the filter unit, the return air duct unit is connected with the filter unit, the filter unit is connected with the surface cooler unit, the surface cooler unit is connected with the blower unit, the blower unit is connected with the supply air duct unit, the supply air duct unit is connected with the variable air volume Box (VAV Box) unit, the variable air volume Box unit is connected with the return air duct unit, and the variable air volume Box unit, the blower unit, the supply air duct unit and the variable air volume Box unit are connected with the control Box unit as shown in FIG. 2.
Specifically, outdoor fresh air in the fresh air duct unit and return air in the return air duct unit are mixed and then enter the filtering machine unit for filtering. The filtered mixed air is cooled and dehumidified through the surface air cooler unit, and the surface air cooler unit achieves that the processed air supply temperature reaches an air supply temperature set value through adjusting the opening degree of a water valve. The processed air supply is pressurized by the air feeder unit and then distributed to all the variable air volume boxes at the tail end by the air supply duct unit, so that the indoor of the building is refrigerated, and a comfortable indoor environment is created.
Optionally, in an embodiment of the present application, before acquiring the opening and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of the fan, the method further includes: initializing a static pressure set value, an air supply temperature set value and a set variable air box air volume lower limit set value in the full-air variable air volume system.
It should be noted that the variable air volume boxes are provided with air valves, return air temperature sensors and air supply volume sensors, and each variable air volume box adjusts the opening of the air valve of the variable air volume box to adjust the air supply volume, so that the return air temperature of the responsible area reaches the set value of the return air temperature of the variable air volume box. The user can adjust the corresponding regional return air temperature set value according to self demand to realize the demand of independent regulation. The actual static pressure value of the air supply duct changes along with the adjustment of the opening degree of the air valve of the tail end variable air volume box, and the air feeder unit achieves that the static pressure value of the air supply duct reaches a static pressure set value by adjusting the frequency of the fan. And returning the return air of the tail end variable air volume box to the air conditioning box again through the return air duct for cooling.
Specifically, a static pressure set value P is uniformly set at the starting stage of the full-air variable air volume system set To an initial value P 0 (usually 150 Pa), and the supply air temperature is set to the initial value T 0 (usually 16 ℃), lower limit of air quantity set value G of variable air volume box min,set To 25l/s.
Meanwhile, the opening D of an air valve of a tail-end all-variable air volume box, the return air temperature T and the set value T of the return air temperature are monitored set Current running frequency of fan F, current air supply temperature set value of system T s,set Current static pressure set value P of system set 。
It can be understood that firstly, the lower limit set value of the air volume of all variable air volume boxes at the tail end is set to be 25l/s, so that the condition that the actual air volume of the variable air volume boxes is limited by the lower limit set value in the operation process, and the air volume cannot be reduced continuously under the condition that the requirement for cooling at the tail end is very small, so that the comfort is influenced by indoor supercooling, and meanwhile, the air volume of a system is excessively increased and the operation energy consumption is increased is avoided.
In step S102, the opening degree and the return air temperature of all the variable air volume box air valves are compared with the preset opening degree and the preset return air temperature of the air valves, and the number of the air volume boxes to be modulated meeting the first preset operation condition in the current operation state is determined according to the compared first comparison result.
In the embodiment of the application, the control box monitors the return air temperature and the set value thereof, the opening of the air valve, the air supply quantity and the upper and lower limit set values thereof, the actual value and the set value of the static pressure of the air supply duct, the frequency of the air supply fan, the air supply temperature and the set value thereof and the opening of the water valve of the surface cooler in real time. And adjusting and resetting the air supply temperature set value, the static pressure set value and the air volume lower limit set value of the variable air volume box according to the actual operation parameters of the full-air variable air volume system.
Optionally, in an embodiment of the present application, comparing the opening degree and the return air temperature of all variable air volume box air valves with the preset opening degree and the preset return air temperature of the air valves, and determining the number of to-be-modulated air volume boxes meeting a first preset operating condition in the current operating state according to a first comparison result after comparison, includes:
the method comprises the steps of counting the opening degree of an air valve of an air volume changing box to be equal to a preset opening degree of the air valve, if the opening degree of the air valve is D =100%, and the difference value between the return air temperature and the preset return air temperature is larger than a preset temperature difference, if the difference value is larger than 1 ℃, the number of the air volume changing boxes to be changed is determined.
In step S103, the number of the air volume boxes to be modulated and the current operating frequency of the fan are compared with a second preset operating condition, a control strategy of the all-air variable air volume system is determined according to a second comparison result after comparison, and the all-air variable air volume system is controlled to execute the control strategy.
Optionally, in an embodiment of the present application, comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, and determining a control strategy of the full-air variable air volume system according to a second comparison result after the comparison, includes: when the number of the air volume boxes to be modulated is larger than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is smaller than the maximum value of the preset fan operating frequency, the static pressure set value is adjusted upwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is larger than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is larger than or equal to the maximum value of the operating frequency of the preset fan, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards; when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is smaller than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value upwards; and if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged.
It can be understood that the embodiment of this application directly adopts variable air box return air temperature and blast gate aperture as running state's judgement factor, and return air temperature directly reflects indoor ambient temperature's the condition of building on the one hand, need not still need to convert air supply temperature and demand air supply temperature into like traditional control scheme and judges. On the other hand, return air temperature sensor and blast gate opening sensor accuracy promote than the air sensor accuracy by a wide margin for the control that the system can be more accurate, more can directly satisfy terminal environment and build the demand.
Optionally, in an embodiment of the present application, the controlling the full air variable air volume system to execute a control strategy includes: adjusting the fan frequency in the full-air variable air volume system to enable the static pressure value of the air supply duct to be the static pressure set value in the adjustment strategy; the air supply temperature is set in the adjustment strategy by adjusting the opening of a water valve of a surface cooler in the full-air variable air volume system.
The following describes a control method of an all-air variable air volume system according to an embodiment.
Fig. 3 is a schematic diagram of the execution logic of a control method for an all-air variable air volume system. As shown in fig. 3, the specific control steps include:
step one, uniformly setting a static pressure set value P at the starting stage of the full-air variable air volume system set To an initial value P 0 (usually 150 Pa), and the supply air temperature is set to the initial value T 0 (usually 16 ℃), lower limit of air quantity set value G of variable air volume box min,set To 25l/s.
Step two, monitoring the opening D of an air valve of a tail-end all-variable air volume box, the return air temperature T and the set value T of the return air temperature set Current running frequency of fan F, current air supply temperature set value of system T s,set Current static pressure set value P of system set 。
And step three, counting the number N of variable air volume boxes with the opening D =100% of the air valve and the return air temperature greater than 1 ℃ than the set value of the return air temperature.
Step four, judging whether N is larger than the allowable upper limit N max And the fan frequency F is less than the upper limit F max (typically 50 Hz), the static pressure is set to the value P set Adjusting the pressure to 10Pa and maintaining the current air supply temperature set value T s,set And is not changed.
Step five, judging whether N is larger than the allowable upper limit N max (recommended setting is 3), but the fan frequency F has reached the upper limit F max (typically 50 Hz), the current static pressure set point P is maintained set Setting the temperature of the air supply to a value T s,set The temperature is reduced by 0.5 ℃.
Step six, judging whether N is smaller than an allowable lower limit N min (recommended setting is 1) and the fan frequency F is greater than the lower limit F min (typically 20 Hz), the static pressure is set to the value P set Regulating 10Pa down, and maintaining the current air supply temperature set value T s,set And is not changed.
Seventhly, judging whether N is smaller than the allowable lower limit N min (recommended setting is 1), but the fan frequency F has reached the lower limit F min (typically 20 Hz), the current hydrostatic pressure setpoint P is maintained set Setting the temperature of the air supply to a value T s,set The increase is 0.5 ℃.
Step eight, judging if N is in the lower limit N min And upper limit N max In between, then the current static pressure set point P is maintained set Maintaining the current supply air temperature set value T s,set And is not changed.
Step nine, updating the static pressure set value P set And a set value T of the air supply temperature s,set And sending the air to a control system, realizing that the static pressure value of the air supply duct reaches a static pressure set value by adjusting the frequency of the fan, and realizing that the air supply temperature reaches an air supply temperature set value by adjusting the opening of a water valve of the surface cooler.
According to the control method of the full-air variable air volume system, the full-air variable air volume system can realize real-time and automatic adjustment of an air supply temperature set value and a static pressure set value according to the changed cooling demand under different operation working conditions in a cooling season through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, so that the full-air variable air volume system can maintain efficient operation for a long time, and the operation energy consumption of the full-air variable air volume system is reduced.
Fig. 4 is a block diagram schematically illustrating an apparatus for controlling an all-air variable air volume system according to an embodiment of the present application.
As shown in fig. 4, the total air variable air volume system control device 10 includes: an acquisition module 100, a comparison module 200, and a control module 300.
The acquisition module 100 is used for acquiring the opening degree and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of a fan; the comparison module 200 is configured to compare the opening and the return air temperature of all the variable air volume box air valves with preset opening and preset return air temperature, and determine the number of air volume boxes to be modulated, which meet first preset operation conditions in the current operation state, according to a first comparison result after comparison; the control module 300 is configured to compare the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, determine a control strategy of the all-air variable air volume system according to a second comparison result after comparison, and control the all-air variable air volume system to execute the control strategy.
Optionally, in an embodiment of the present application, the method further includes: and the initialization module is used for initializing a static pressure set value, an air supply temperature set value and a set air volume lower limit set value of the variable air volume box in the full-air variable air volume system.
Optionally, in an embodiment of the present application, the comparison module 200 is specifically configured to count the number of variable air volume boxes with an opening degree of the variable air volume box air valve equal to a preset opening degree of the air valve, and a difference between the return air temperature and the preset return air temperature being greater than a preset temperature difference, so as to determine the number of the air volume boxes to be modulated.
Optionally, in an embodiment of the present application, the control module 300 is specifically configured to, when the number of the to-be-modulated air volume boxes is greater than the maximum value of the preset variable air volume boxes, and the current operating frequency of the fan is less than the maximum value of the preset fan operating frequency, adjust the static pressure setting value upward, and keep the current air supply temperature setting value unchanged; when the number of the air volume boxes to be modulated is larger than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is larger than or equal to the maximum value of the operating frequency of the preset fan, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards; when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged; when the number of the air volume boxes to be modulated is less than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is less than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value upwards; and if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged.
Optionally, in an embodiment of the present application, the control module 300 further includes: the optimization unit is used for enabling the static pressure value of the air delivery duct to be the static pressure set value in the adjustment strategy by adjusting the fan frequency in the full-air variable air volume system; and the adjusting unit is used for adjusting the opening degree of a water valve of a surface air cooler in the full-air variable air volume system so as to enable the air supply temperature to be the set value of the air supply temperature in the adjusting strategy.
It should be noted that the foregoing explanation of the embodiment of the full-air variable air volume system control method is also applicable to the full-air variable air volume system control device of the embodiment, and details are not repeated herein.
According to the control device of the all-air variable air volume system, on the basis that hardware equipment such as a sensor is not added, the monitoring of required operation parameters can be achieved by using the sensor of the all-air variable air volume system. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the real-time and automatic adjustment of the air supply temperature set value and the static pressure set value is realized according to the changed cooling demand under different operation working conditions of the full-air variable air volume system in the cooling season, the full-air variable air volume system maintains efficient operation for a long time, and the operation energy consumption of the full-air variable air volume system is reduced.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:
memory 501, processor 502, and computer programs stored on memory 501 and executable on processor 502.
The processor 502 executes the program to implement the control method of the full air variable air volume system provided in the above embodiments.
Further, the electronic device further includes:
a communication interface 503 for communication between the memory 501 and the processor 502.
A memory 501 for storing computer programs that can be run on the processor 502.
The memory 501 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on one chip, the memory 501, the processor 502, and the communication interface 503 may complete mutual communication through an internal interface.
The processor 502 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
The present embodiment also provides a computer-readable storage medium, on which a computer program is stored, wherein the program is executed by a processor to implement the above-mentioned full-air variable air volume system control method.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

Claims (8)

1. A control method of an all-air variable air volume system is characterized by comprising the following steps:
collecting the opening degree and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of a fan;
comparing the opening degree and the return air temperature of all the variable air volume box air valves with the preset air valve opening degree and the preset return air temperature, and determining the number of the to-be-modulated air volume boxes meeting the first preset operation condition in the current operation state according to the compared first comparison result;
comparing the number of the air volume boxes to be modulated with the current operating frequency of the fan with a second preset operating condition, determining a control strategy of the all-air variable air volume system according to a second comparison result after comparison, and controlling the all-air variable air volume system to execute the control strategy;
the step of comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, and determining the control strategy of the full-air variable air volume system according to a second comparison result after comparison comprises the following steps:
when the number of the air volume boxes to be modulated is larger than the maximum value of the number of preset variable air volume boxes and the current operating frequency of the fan is smaller than the maximum value of the preset fan operating frequency, the static pressure set value is adjusted upwards, and the current air supply temperature set value is kept unchanged;
when the number of the air volume boxes to be modulated is greater than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is greater than or equal to the maximum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards;
when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged;
when the number of the air volume boxes to be modulated is less than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is less than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and increasing the air supply temperature set value;
if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged;
the control of the full-air variable air volume system to execute the control strategy comprises the following steps:
adjusting the fan frequency in the full-air variable air volume system to enable the static pressure value of the air delivery duct to be a static pressure set value in an adjustment strategy;
and adjusting the opening of a water valve of a surface air cooler in the full-air variable air volume system to enable the air supply temperature to be the set value of the air supply temperature in the adjustment strategy.
2. The method of claim 1, wherein the collecting all variable air volume box air valve opening and return air temperature in the all air variable air volume system is prior to the current operating frequency of the fan, further comprising:
and initializing a static pressure set value, an air supply temperature set value and a set variable air box air volume lower limit set value in the full-air variable air volume system.
3. The method according to claim 1, wherein the comparing the opening degree and the return air temperature of all the variable air volume box air valves with the preset opening degree and the preset return air temperature, and determining the number of the air volume boxes to be modulated which meet the first preset operation condition in the current operation state according to the compared first comparison result comprises:
and counting the opening degree of the variable air volume box air valve is equal to the preset opening degree of the air valve, and determining the number of the variable air volume boxes with the preset air return temperature difference value larger than the preset temperature difference to regulate the number of the air volume boxes to be regulated.
4. The utility model provides a full air variable air volume system controlling means which characterized in that includes:
the acquisition module is used for acquiring the opening degree and the return air temperature of all variable air volume box air valves in the full-air variable air volume system and the current operating frequency of the fan;
the comparison module is used for comparing the opening degree and the return air temperature of all the variable air volume box air valves with the preset air valve opening degree and the preset return air temperature, and determining the number of the air volume boxes to be modulated meeting first preset operation conditions in the current operation state according to a first comparison result after comparison;
the control module is used for comparing the number of the air volume boxes to be modulated and the current operating frequency of the fan with a second preset operating condition, determining a control strategy of the full-air variable air volume system according to a second comparison result after comparison, and controlling the full-air variable air volume system to execute the control strategy;
the control module is specifically configured to,
when the number of the air volume boxes to be modulated is larger than the maximum value of the number of preset variable air volume boxes and the current operating frequency of the fan is smaller than the maximum value of the preset fan operating frequency, the static pressure set value is adjusted upwards, and the current air supply temperature set value is kept unchanged;
when the number of the air volume boxes to be modulated is greater than the maximum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is greater than or equal to the maximum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and adjusting the air supply temperature set value downwards;
when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of preset variable air volume boxes and the current operating frequency of the fan is larger than the minimum value of the preset fan operating frequency, the static pressure set value is adjusted downwards, and the current air supply temperature set value is kept unchanged;
when the number of the air volume boxes to be modulated is smaller than the minimum value of the number of the preset variable air volume boxes and the current operating frequency of the fan is smaller than or equal to the minimum value of the preset fan operating frequency, keeping the current static pressure set value unchanged, and increasing the air supply temperature set value;
if the number of the air volume boxes to be modulated is greater than or equal to the minimum value of the number of the preset variable air volume boxes and is less than or equal to the maximum value of the number of the preset variable air volume boxes, keeping the current static pressure set value and the current air supply temperature set value unchanged;
the control module further comprises:
the optimization unit is used for enabling the static pressure value of the air delivery duct to be the static pressure set value in the adjustment strategy by adjusting the fan frequency in the full-air variable air volume system;
and the adjusting unit is used for adjusting the opening degree of a water valve of a surface cooler in the full-air variable air volume system so as to enable the air supply temperature to be the set value of the air supply temperature in the adjusting strategy.
5. The apparatus of claim 4, further comprising:
and the initialization module is used for initializing a static pressure set value, an air supply temperature set value and a set variable air volume box air volume lower limit set value in the full-air variable air volume system.
6. The device according to claim 4, characterized in that the comparison module, in particular for,
and counting the opening degree of the variable air volume box air valve is equal to the preset opening degree of the air valve, and determining the number of the variable air volume boxes with the preset air return temperature difference value larger than the preset temperature difference to be subjected to modulation.
7. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the full air variable volume system control method according to any one of claims 1 to 3.
8. A computer-readable storage medium having a computer program stored thereon, wherein the program is executed by a processor for implementing the all-air variable air volume system control method according to any one of claims 1 to 3.
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