CN115875830B - Multifunctional intelligent control system and method for chemical fiber spinning air conditioner - Google Patents
Multifunctional intelligent control system and method for chemical fiber spinning air conditioner Download PDFInfo
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- 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
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Abstract
The application provides a multifunctional intelligent control system and method of a chemical fiber spinning air conditioner, wherein the system comprises the following components: the temperature and humidity acquisition module, the operation parameter acquisition module and the control module; the method comprises the following steps: collecting the temperature and humidity of the interior and the exterior of the environment provided with the chemical fiber spinning air conditioner, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner; parameters in the running process of the chemical fiber spinning air conditioner are collected through a sensor and sent to a storage for standby; and regulating the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters, and giving out a maintenance scheme. The application judges the working condition of the chemical fiber spinning air conditioner, and adopts the corresponding control mode to control, thereby achieving the purpose of saving energy consumption and reducing the operation cost of enterprises; the parameter acquisition module is added to acquire parameters in the operation process of the chemical fiber spinning air conditioner, so that the control module can acquire the operation conditions of all devices in time.
Description
Technical Field
The application relates to the technical field of intelligent control, in particular to a multifunctional intelligent control system and method of a chemical fiber spinning air conditioner.
Background
The central air conditioning unit is an air conditioning system in which air treatment equipment is concentrated in a central air conditioning room, and the treated air is sent to each room through an air pipe. The centralized air conditioning unit is suitable for places with large area, centralized rooms and relatively close heat and humidity loads of all rooms, such as hotels, office buildings, ships, factories and the like. The system is convenient to maintain and manage, and the silencing and vibration isolating of the equipment are easy to solve. With the development of economic construction and the improvement of living standard of people, a centralized air conditioning unit is widely applied to various fields of textile, electronics, civil buildings and the like, plays an increasingly important role, in textile industry enterprises in China, the energy consumption of an air conditioning refrigerating system is large in proportion to the total energy consumption of the enterprises, especially chemical fiber spinning air conditioners are mainly used, the air supply parameters of the chemical fiber spinning air conditioners directly relate to the quality of chemical fiber spinning, and a chemical fiber combined air conditioning system consists of an air valve actuator, a temperature and humidity sensor, a differential pressure switch, a differential pressure transmitter, a three-way cold water valve, an actuator, a steam two-way valve, a frequency converter and a PLC, wherein the basic task of the air conditioning system is to keep certain temperature and humidity of air in a workshop, discharge redundant heat and moisture and timely supplement the workshop when the heat and the moisture are insufficient; in order to complete the task, the temperature and humidity to be regulated can approach to the set temperature and humidity value according to curves such as isothermal humidification, adiabatic humidification, cooling humidification and the like, but the existing chemical fiber spinning air conditioner cannot regulate the proportion of fresh air and return air according to the enthalpy value of the fresh air, so that the energy consumption of the operation of the chemical fiber spinning air conditioner is increased, and on the other hand, the detection and judgment of faults are lacking, so that the maintenance level of equipment is not timely, and the production efficiency is reduced.
In the first prior art, CN108180577a is a textile air conditioning system with a cold source, which comprises a machine body, a basic humidification spray unit, a re-cooling spray unit, an air-cooled refrigerator, a first spray water pump, a second spray water pump and a blower, wherein the basic humidification spray unit, the re-cooling spray unit and the blower are sequentially arranged along the air supply direction, an evaporator water inlet valve and a steam outlet valve are arranged on the air-cooled refrigerator, the steam outlet valve is respectively connected with the first spray water pump and the second spray water pump through pipelines, a basic humidification spray pump valve water inlet valve is arranged on a pipeline between the air-cooled refrigerator and the basic humidification spray unit, a re-cooling spray water inlet valve is arranged on a pipeline between the air-cooled refrigerator and the re-cooling spray unit, and the evaporator water inlet valve is respectively connected with the first spray water pump and the second spray water pump through pipelines, although a chilled water pump, a cooling water pump and a chilled water pipeline are saved; a cooling system is saved; the surface air cooler of the air conditioner is saved, the resistance of the air feeder is reduced, but the fresh air and return air proportion cannot be adjusted according to the fresh air enthalpy value, the energy consumption of the chemical fiber spinning air conditioner is increased, the detection and judgment of faults are also lacking, the equipment maintenance level is not timely maintained, and the production efficiency is reduced.
In the prior art, a novel wet curtain energy-saving textile air conditioner control system of CN113251483B comprises an outer box and a fixed block, wherein two adjacent side walls on the outer box are provided with a first blind grid, the inner side of the first blind grid is provided with a first wet curtain, a first slide rail is fixedly arranged on the inner bottom of the outer box, and a second wet curtain is connected to the first slide rail in a sliding manner. This novel energy-conserving weaving air conditioner control system of wet curtain, through being provided with slide rail one, wet curtain two and chamber door, open the case door and install wet curtain two in slide rail one, make wet curtain two be located the inside of outer case, the water pump circular telegram is with water through the water pipe input divide drenching in the pipe, because divide drenching the pipe and be located wet curtain one and wet curtain two directly over, divide the water droplet that drenches in the pipe and drenches wet curtain one and wet curtain two, when the motor circular telegram drives the flabellum and rotates, absorb external air current, the air current will need pass through wet curtain one when entering into the inside of outer case through shutter grid one and shutter grid two. Although possess the too moist of reinforcing heat dissipation cooling and can effectually avoided indoor air, its function is single, leads to the intelligent extension level of equipment lower.
In the third prior art, CN102418970B is a special combined energy-saving air conditioning unit for textile mill, the air purifying module comprises a drawer type unit filtering device, an automatic dust collecting device, a return fan, a fine dust conveying fan and a dust collecting device, the return fan is connected with the drawer type unit filtering device, the automatic dust collecting device is matched with the drawer type unit filtering device, the automatic dust collecting device absorbs fine dust of the drawer type unit filtering device, and the fine dust conveying fan sends the fine dust absorbed by the automatic dust collecting device into the dust collecting device; the air treatment module comprises a circulating water tank, a spray water pump, a spray device and a blower, wherein the spray water pump pumps the circulating water tank to the spray device, the spray device is provided with a vertical upward atomization small hole, and air and spray water are sent to a workshop through the blower after heat-moisture exchange. Compared with the prior art, although the air conditioner of the textile mill can be miniaturized and simplified, the association of the structure and the capacity is separated, the energy consumption and the occupied area of the air conditioner are effectively reduced, the investment is reduced, but the detection and the judgment of faults are lacking, so that the maintenance of equipment maintenance level is not timely, and the production efficiency is reduced.
The existing first, second and third technologies cannot adjust the proportion of fresh air and return air according to the enthalpy value of the fresh air, so that the energy consumption of the chemical fiber spinning air conditioner in operation is increased; the application provides a multifunctional intelligent control system and a method for a chemical fiber spinning air conditioner, which are used for realizing the functions of adjusting the proportion of fresh air and return air and diagnosing faults according to the enthalpy value of fresh air, and achieving the purpose of multifunctional intelligent control of the chemical fiber spinning air conditioner.
Disclosure of Invention
In order to solve the technical problems, the application provides a multifunctional intelligent control system of a chemical fiber spinning air conditioner, which comprises
The temperature and humidity acquisition module is responsible for acquiring the temperature and humidity of the interior and the exterior of the environment in which the chemical fiber spinning air conditioner is installed, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner;
the operation parameter acquisition module is in charge of acquiring parameters of the chemical fiber spinning air conditioner in the operation process through a sensor and sending the parameters to the storage for standby;
the control module is connected with the temperature and humidity acquisition module and the operation parameter acquisition module and is responsible for adjusting the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters and giving a maintenance scheme.
Optionally, the humiture acquisition module includes:
the temperature measurement submodule is responsible for setting temperature sensors at the outlet of the blower and the inlet of the return air machine and measuring the temperatures of the outlet of the blower and the inlet of the return air machine;
the humidity measurement submodule is responsible for setting humidity sensors at the blower outlet and the air return inlet and measuring the humidity of the blower outlet and the air return inlet;
the fresh air enthalpy value calculating submodule is responsible for calculating fresh air enthalpy value according to the temperature and the humidity of the outlet of the blower;
and the return air enthalpy value calculation submodule is responsible for calculating the return air enthalpy value according to the temperature and the humidity of the outlet of the return air machine.
Optionally, the temperature measurement submodule includes: and a temperature compensation unit for temperature compensation by a temperature sensor is arranged at the inlet of the air feeder outlet and the inlet of the air return machine.
Optionally, the humidity measurement submodule comprises a humidity compensation unit responsible for calibrating the humidity sensor; a humidity compensation unit comprising:
a humidity control subunit, responsible for providing control signals for humidity sensor calibration;
humidity compensation subunit the humidity compensation subunit is responsible for coating sensitive films on the measurement channel of the humidity sensor, and coating biaxially oriented polypropylene films on the reference channel of the humidity sensor.
Optionally, the operation parameter acquisition module includes:
the state parameter acquisition submodule is responsible for acquiring state parameters of each device of the chemical fiber spinning air conditioner in operation by adopting a sensor;
the parameter abnormality judging sub-module is in charge of receiving the state parameters acquired by the state parameter acquisition sub-module, comparing the state parameters with preset standard state parameters, and judging that the state parameters are abnormal when exceeding a threshold value;
and the abnormality display sub-module is responsible for receiving the result of the parameter abnormality judgment sub-module and displaying the name and fault code of the equipment.
Optionally, the parameter anomaly determination submodule includes:
the threshold setting unit comprises a first threshold, a second threshold and a third threshold, the chemical fiber spinning air conditioner is operated under at least five working conditions, the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are recorded, the boundary values of the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are calculated respectively, and the boundary values are averaged to obtain the first threshold, the second threshold and the third threshold;
the first parameter judging unit is responsible for comparing the frequency of the shell vibration of the chemical fiber spinning air conditioner with a first threshold value, and sending the frequency to the abnormal display submodule for display when the frequency exceeds the first threshold value;
the second parameter judging unit is responsible for monitoring the replacement period of the vulnerable materials used by the chemical fiber spinning air conditioner, and sending the vulnerable materials to the abnormal display submodule for display when the vulnerable materials exceed a second threshold value;
and the third parameter judging unit is responsible for detecting the operation parameters of the electrical equipment of the chemical fiber spinning air conditioner, and sending the operation parameters to the abnormal display submodule for display if the operation parameters exceed a third threshold value.
Optionally, the control module includes:
the first judging condition sub-module is responsible for adopting fresh air to run when the fresh air enthalpy value is larger than the return air enthalpy value, regulating the fresh air valve to the maximum, cooling the air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second discrimination condition submodule is in charge of only ventilating when the fresh air enthalpy value is smaller than the return air enthalpy value, and regulating the fresh air valve to be minimum;
the third discrimination condition sub-module is responsible for keeping the current state of the regulating fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value;
the fresh air valve adjusting sub-module is responsible for receiving the instructions of the first judging condition sub-module, the second judging condition sub-module and the third judging condition sub-module, opening and closing the fresh air valve and changing the lift of the fresh air valve through the adjusting unit, and the adjusting unit comprises a damping current sub-unit and a motor sub-unit, wherein the damping current sub-unit decelerates a motor running when the fresh air valve is closed according to the speed; the motor subunit drives the fresh air valve to open and close through the transmission device.
Optionally, the control module further includes:
the fault code identification sub-module is responsible for identifying fault codes and names of equipment;
the processing measure identification sub-module is responsible for calling a pre-stored fault maintenance scheme according to the fault code;
and the equipment restarting sub-module is responsible for restarting the equipment with faults after the execution of the processing measure identification sub-module is finished, and alarming and overhauling by professional maintenance staff if the fault code still exists.
The application provides a multifunctional intelligent control method of a chemical fiber spinning air conditioner, which comprises the following steps:
the temperature and humidity acquisition module acquires the temperature and humidity of the interior and the exterior of the environment provided with the chemical fiber spinning air conditioner, calculates a fresh air enthalpy value according to the temperature and the humidity of an outlet of the blower, calculates a return air enthalpy value according to the temperature and the humidity of an outlet of the return air machine, and calculates a fresh air enthalpy value and a return air enthalpy value of the chemical fiber spinning air conditioner;
the operation parameter acquisition module acquires parameters in the operation process of the chemical fiber spinning air conditioner through a sensor, sends the parameters to the memory for standby, receives the result of parameter abnormality judgment, and displays the name and fault code of the equipment;
the control module adjusts the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value through three distinguishing conditions, diagnoses the chemical fiber spinning air conditioner according to the operation parameters and gives out maintenance schemes.
Optionally, the three discrimination conditions include:
the first judging condition is in charge of adopting fresh air to run when the fresh air enthalpy value is greater than the return air enthalpy value, regulating a fresh air valve to the maximum, cooling air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second judging condition is in charge of ventilation only when the fresh air enthalpy value is smaller than the return air enthalpy value, and the fresh air valve is adjusted to be minimum;
and the third judging condition is responsible for keeping the current state of the fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value.
The temperature and humidity acquisition module is responsible for acquiring the temperature and humidity of the interior and the exterior of the environment in which the chemical fiber spinning air conditioner is installed, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner; the operation parameter acquisition module is responsible for acquiring parameters of the chemical fiber spinning air conditioner in the operation process through a sensor and sending the parameters to the storage for standby; the control module is responsible for adjusting the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters and giving a maintenance scheme; according to the embodiment, the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner are calculated, the working condition of the chemical fiber spinning air conditioner is judged according to the fresh air enthalpy value and the return air enthalpy value, and the corresponding control mode is adopted for control, so that the purpose of saving energy consumption is achieved, and the operation cost of enterprises is also reduced; the parameter acquisition module is added to acquire parameters in the operation process of the chemical fiber spinning air conditioner, the control module can acquire the operation conditions of all devices in time, the replacement time is set for the consumable devices, the chemical fiber spinning air conditioner is diagnosed according to the operation parameters, a maintenance scheme is provided, the chemical fiber spinning air conditioner is ensured to be in a good operation environment, the chemical fiber spinning air conditioner is enabled to operate efficiently, meanwhile, the quality and the quality of chemical fiber spinning production are improved, and the production benefit of enterprises is increased.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a block diagram of a multifunctional intelligent control system of a chemical fiber spinning air conditioner in embodiment 1 of the application;
FIG. 2 is a block diagram of a temperature and humidity acquisition module in embodiment 2 of the present application;
FIG. 3 is a block diagram of an operation parameter acquisition module in embodiment 5 of the present application;
FIG. 4 is a block diagram of a parameter anomaly determination submodule in embodiment 6 of the present application;
FIG. 5 is a block diagram of a control module in embodiment 7 of the present application;
fig. 6 is a flowchart of a multifunctional intelligent control method of a chemical fiber spinning air conditioner according to embodiment 9 of the present application.
Detailed Description
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application as detailed in the accompanying claims. In the description of the present application, it should be understood that the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and are not necessarily used to describe a particular order or sequence, nor should they be construed to indicate or imply relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
As shown in fig. 1, the embodiment of the application provides a multifunctional intelligent control system of a chemical fiber spinning air conditioner, which comprises the following steps:
the temperature and humidity acquisition module is responsible for acquiring the temperature and humidity of the interior and the exterior of the environment in which the chemical fiber spinning air conditioner is installed, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner;
the operation parameter acquisition module is in charge of acquiring parameters of the chemical fiber spinning air conditioner in the operation process through a sensor and sending the parameters to the storage for standby;
the control module is connected with the temperature and humidity acquisition module and the operation parameter acquisition module and is responsible for adjusting the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters and giving a maintenance scheme.
The working principle and beneficial effects of the technical scheme are as follows: the temperature and humidity acquisition module is responsible for acquiring the temperature and humidity of the interior and the exterior of the environment in which the chemical fiber spinning air conditioner is installed, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner; the operation parameter acquisition module is responsible for acquiring parameters of the chemical fiber spinning air conditioner in the operation process through a sensor and sending the parameters to the storage for standby; the control module is responsible for adjusting the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters and giving a maintenance scheme; according to the embodiment, the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner are calculated, the working condition of the chemical fiber spinning air conditioner is judged according to the fresh air enthalpy value and the return air enthalpy value, and the corresponding control mode is adopted for control, so that the purpose of saving energy consumption is achieved, and the operation cost of enterprises is also reduced; the parameter acquisition module is added to acquire parameters in the operation process of the chemical fiber spinning air conditioner, the control module can acquire the operation conditions of all devices in time, the replacement time is set for the consumable devices, the chemical fiber spinning air conditioner is diagnosed according to the operation parameters, a maintenance scheme is provided, the chemical fiber spinning air conditioner is ensured to be in a good operation environment, the chemical fiber spinning air conditioner is enabled to operate efficiently, meanwhile, the quality and the quality of chemical fiber spinning production are improved, and the production benefit of enterprises is increased.
Example 2
As shown in fig. 2, on the basis of embodiment 1, the temperature and humidity acquisition module provided by the embodiment of the present application includes:
the temperature measurement submodule is responsible for setting temperature sensors at the outlet of the blower and the inlet of the return air machine and measuring the temperatures of the outlet of the blower and the inlet of the return air machine;
the humidity measurement submodule is responsible for setting humidity sensors at the blower outlet and the air return inlet and measuring the humidity of the blower outlet and the air return inlet;
the fresh air enthalpy value calculating submodule is responsible for calculating fresh air enthalpy value according to the temperature and the humidity of the outlet of the blower;
and the return air enthalpy value calculation submodule is responsible for calculating the return air enthalpy value according to the temperature and the humidity of the outlet of the return air machine.
The working principle and beneficial effects of the technical scheme are as follows: the temperature measuring submodule is responsible for setting temperature sensors at the outlet of the blower and the inlet of the return air machine and measuring the temperatures of the outlet of the blower and the inlet of the return air machine; the humidity measurement submodule is responsible for setting humidity sensors at the blower outlet and the air return inlet and measuring the humidity of the blower outlet and the air return inlet; the fresh air enthalpy calculation submodule is responsible for calculating fresh air enthalpy according to the temperature and the humidity of the outlet of the blower; the return air enthalpy calculation submodule is responsible for calculating the return air enthalpy according to the temperature and the humidity of an outlet of the return air machine; according to the embodiment, the temperature sensors are arranged at the air feeder outlet and the air return inlet, the humidity sensors are arranged at the air feeder outlet and the air return inlet, measurement of the temperature and humidity inside and outside the chemical fiber spinning air conditioning environment is achieved, the temperature sensors and the humidity sensors can be distributed in actual use, the middle bit of the temperature sensors and the humidity sensors can be calculated through the control module, the distribution mode of the temperature sensors and the humidity sensors can accurately obtain the fresh air enthalpy value and the return air enthalpy value, the control of the fresh air valve is achieved, energy conservation and emission reduction are achieved, and the operation cost of enterprises is reduced.
Example 3
Based on the embodiment 2, the calculation formula of the fresh air enthalpy value provided by the embodiment of the application is as follows:
i 1 ＝(1.01+1.84D 1 )T 1 +2500dD 1
the calculation formula of the return air enthalpy value:
i 2 ＝(1.01+1.84D 2 )T 2 +2500D 2
wherein i is 1 Represents the enthalpy value of fresh air, D 1 Indicating humidity of outlet air of blower, T 1 Representing the temperature of the blower outlet air; i.e 2 Indicating the enthalpy of return air, D 2 Indicating the humidity of the air at the outlet of the air return machine, T 2 Indicating the temperature of the air at the outlet of the air returning machine;
the working principle and beneficial effects of the technical scheme are as follows: the scheme realizes the calculation of the fresh air enthalpy value and the return air enthalpy value through the temperature and the humidity of the outlet of the blower and the inlet of the return air machine, (1.01+1.84D) 1 )T 1 And (1.01+1.84D) 2 )T 2 2500D indicating heat as a function of temperature 1 And 2500D 2 Represents the latent heat of vaporization of water at 0 ℃ and only changes with the moisture content, and is independent of temperature; the calculation of the fresh air enthalpy value and the return air enthalpy value realizes the control of the fresh air valve, is favorable for providing accurate fresh air enthalpy value and return air enthalpy value, and realizes the chemical fiber spinning air conditionerAnd (5) intelligent control.
Example 4
On the basis of embodiment 2, the temperature measurement submodule provided by the embodiment of the application comprises: a temperature compensation unit for temperature compensation by arranging a temperature sensor at the outlet of the blower and the inlet of the return air machine; the compensation function x (T) of the temperature compensation unit is expressed as:
the lower limit of the compensation function x (T) is:
wherein T represents the temperature of the temperature sensor to be compensated, T ε T 1 ,T 2 ，T 1 Representing the temperature of the blower outlet air; t (T) 2 Indicating the temperature of the air at the outlet of the air returning machine; ω represents a constant in temperature compensation adjustment, typically 0.10, k represents the compensation force for adjusting the resistance value, R represents the resistance value in the temperature sensor,represented at T 1 The resistance value in the temperature sensor at temperature,represented at T 2 Resistance value, I in temperature sensor at temperature R Representing the acquired resistance value of the temperature to be compensated, y representing the resistance value function at the sampling time t, Ω representing the resistance value at the sampling time t, A R An initial value representing the resistance of the temperature sensor;
the humidity measurement submodule provided by the embodiment of the application comprises a humidity compensation unit which is responsible for the calibration of a humidity sensor; a humidity compensation unit comprising:
a humidity control subunit, responsible for providing control signals for humidity sensor calibration;
humidity compensation subunit the humidity compensation subunit is responsible for coating sensitive films on the measurement channel of the humidity sensor and coating biaxially oriented polypropylene films on the reference channel of the humidity sensor;
the working principle and beneficial effects of the technical scheme are as follows: the scheme is provided with the temperature compensation unit responsible for temperature compensation by arranging the temperature sensors at the outlet of the air feeder and the inlet of the air return machine, so that the temperature compensation of the temperature sensors is realized, the accuracy of the quantity of the temperature sensors is improved, the measurement accuracy of the temperature of the outlet of the air feeder and the inlet of the air return machine is improved, and the integral control capability of the chemical fiber spinning air conditioner is improved due to the fact that in the working environment of the chemical fiber spinning air conditioner, equipment is complex and objective factors influencing the temperature are more, the influence of the objective factors on temperature measurement is reduced through temperature compensation; the humidity control subunit is responsible for providing a control signal for calibrating the humidity sensor; the humidity compensation subunit is responsible for coating a sensitive film on a measurement channel of the humidity sensor, and coating a biaxially oriented polypropylene film on a reference channel of the humidity sensor, so that the humidity compensation function is increased, the humidity compensation effect can be enhanced, and the difference of humidity drift between the measurement channel of the humidity sensor and the reference channel is reduced.
Example 5
As shown in fig. 3, on the basis of embodiment 1, the operation parameter collection module provided in the embodiment of the present application includes:
the state parameter acquisition submodule is responsible for acquiring state parameters of each device of the chemical fiber spinning air conditioner in operation by adopting a sensor; the apparatus comprises: the air conditioning unit comprises an air mixing unit body, a flow equalizing unit body, a filtering unit body, a cooling unit body, a primary heating unit body, a secondary heating unit body, a dehumidifying unit body, a humidifying unit body, a blower unit body, a return air machine unit body, a water spraying unit body, a silencing unit body, a heat recovery unit body and the like; the state parameters comprise shell vibration, vulnerable material replacement period, electrical equipment operation parameters and the like;
the parameter abnormality judging sub-module is in charge of receiving the state parameters acquired by the state parameter acquisition sub-module, comparing the state parameters with preset standard state parameters, and judging that the state parameters are abnormal when exceeding a threshold value;
the abnormality display sub-module is used for receiving the result of the parameter abnormality judgment sub-module and displaying the name and fault code of the equipment;
the working principle and beneficial effects of the technical scheme are as follows: the state parameter acquisition submodule of the scheme is responsible for acquiring state parameters of each device of the chemical fiber spinning air conditioner in operation by adopting a sensor; the parameter abnormality judging sub-module is in charge of receiving the state parameters acquired by the state parameter acquisition sub-module, comparing the state parameters with preset standard state parameters, and judging that the state parameters are abnormal when exceeding a threshold value; the abnormality display sub-module is used for receiving the result of the parameter abnormality judgment sub-module and displaying the name and fault code of the equipment; the embodiment collects the state parameters of all important equipment of the chemical fiber spinning air conditioner, timely obtains the state in the running process, is convenient for operators to repair or maintain the equipment in time, realizes intelligent monitoring of the running of the equipment, and achieves the aim of multifunctional intelligent control of the chemical fiber spinning air conditioner; the abnormality judgment is carried out through the preset threshold value of each device, so that the intelligent judgment of the device fault is realized, and the trouble of manual judgment is avoided; the name and fault code of the equipment are displayed, so that the operation control level of the chemical fiber spinning air conditioner is improved, operators can intuitively know the running state of the equipment, and the quality of products is improved.
Example 6
As shown in fig. 4, on the basis of embodiment 5, the parameter anomaly determination sub-module provided in the embodiment of the present application includes:
the threshold setting unit comprises a first threshold, a second threshold and a third threshold, the chemical fiber spinning air conditioner is operated under at least five working conditions, the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are recorded, the boundary values of the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are calculated respectively, and the boundary values are averaged to obtain the first threshold, the second threshold and the third threshold;
the first parameter judging unit is responsible for comparing the frequency of the shell vibration of the chemical fiber spinning air conditioner with a first threshold value, and sending the frequency to the abnormal display submodule for display when the frequency exceeds the first threshold value;
the second parameter judging unit is responsible for monitoring the replacement period of the vulnerable materials used by the chemical fiber spinning air conditioner, and sending the vulnerable materials to the abnormal display submodule for display when the vulnerable materials exceed a second threshold value;
the third parameter judging unit is in charge of detecting the operation parameters of the electrical equipment of the chemical fiber spinning air conditioner, and sending the operation parameters to the abnormal display submodule for display if the operation parameters exceed a third threshold value;
the working principle and beneficial effects of the technical scheme are as follows: the scheme threshold setting unit comprises a first threshold, a second threshold and a third threshold, at least the chemical fiber spinning air conditioner is operated under five working conditions, the frequency of the shell vibration, the vulnerable material replacement period and the operating parameters of the electrical equipment under each working condition are recorded, the boundary values of the frequency of the shell vibration, the vulnerable material replacement period and the operating parameters of the electrical equipment under each working condition are calculated respectively, and the boundary values are averaged to obtain the first threshold, the second threshold and the third threshold; the first parameter judging unit is responsible for comparing the frequency of the shell vibration of the chemical fiber spinning air conditioner with a first threshold value, and sending the frequency to the abnormal display submodule for display if the frequency exceeds the first threshold value; the second parameter judging unit is responsible for monitoring the replacement period of the vulnerable materials used by the chemical fiber spinning air conditioner, and sending the vulnerable materials to the abnormal display submodule for display when the vulnerable materials exceed a second threshold value; the third parameter judging unit is in charge of detecting the operation parameters of the electrical equipment of the chemical fiber spinning air conditioner, and sending the operation parameters to the abnormal display submodule for display if the operation parameters exceed a third threshold value; according to the embodiment, the threshold value is set by setting different working conditions, so that the accuracy of judging the first parameter, the second parameter and the third parameter is improved, the operation condition of the chemical fiber spinning air conditioner is monitored, and an accurate data base is provided for the monitoring result.
Example 7
As shown in fig. 5, on the basis of embodiment 1, a control module provided in an embodiment of the present application includes:
the first judging condition sub-module is responsible for adopting fresh air to run when the fresh air enthalpy value is larger than the return air enthalpy value, regulating the fresh air valve to the maximum, cooling the air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second discrimination condition submodule is in charge of only ventilating when the fresh air enthalpy value is smaller than the return air enthalpy value, and regulating the fresh air valve to be minimum;
the third discrimination condition sub-module is responsible for keeping the current state of the regulating fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value;
the fresh air valve adjusting sub-module is responsible for receiving the instructions of the first judging condition sub-module, the second judging condition sub-module and the third judging condition sub-module, opening and closing the fresh air valve and changing the lift of the fresh air valve through the adjusting unit, and the adjusting unit comprises a damping current sub-unit and a motor sub-unit, wherein the damping current sub-unit decelerates a motor running when the fresh air valve is closed according to the speed; the motor subunit drives the fresh air valve to open and close through the transmission device;
the working principle and beneficial effects of the technical scheme are as follows: the first judging condition sub-module of the scheme is responsible for adopting full fresh air to operate when the fresh air enthalpy value is larger than the return air enthalpy value, adjusting the fresh air valve to the maximum, cooling the air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner; the second discrimination condition sub-module is responsible for ventilation only when the fresh air enthalpy value is smaller than the return air enthalpy value, and regulating the fresh air valve to be minimum; the third discrimination condition sub-module is responsible for keeping the current state of the regulating fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value; the fresh air valve adjusting sub-module is responsible for receiving the instructions of the first judging condition sub-module, the second judging condition sub-module and the third judging condition sub-module, opening and closing the fresh air valve and changing the lift of the fresh air valve through the adjusting unit, wherein the adjusting unit comprises a damping current sub-unit and a motor sub-unit, and the damping current sub-unit enables a motor running when the fresh air valve is closed to be decelerated according to the speed; the motor subunit drives the fresh air valve to open and close through the transmission device; the embodiment adopts three discrimination conditions to realize the opening and closing of the fresh air valve, so that on one hand, the high-efficiency operation of the chemical fiber spinning air conditioner is ensured, and on the other hand, the energy conservation and emission reduction are realized, and the chemical fiber spinning air conditioner can change according to the temperature and humidity change of the environment; the accurate control of the fresh air valve is realized by adopting the regulating unit, the opening and closing operation of the fresh air valve is realized, the motor which runs when the fresh air valve is closed is decelerated according to the speed by the damping electronic unit, the fresh air valve is prevented from being opened and closed in place, and the aim of protecting equipment is fulfilled.
Example 8
On the basis of embodiment 7, the control module provided by the embodiment of the application further includes:
the fault code identification sub-module is responsible for identifying fault codes and names of equipment;
the processing measure identification sub-module is responsible for calling a pre-stored fault maintenance scheme according to the fault code;
and the equipment restarting sub-module is responsible for restarting the equipment with faults after the execution of the processing measure identification sub-module is finished, and alarming and overhauling by professional maintenance staff if the fault code still exists.
The working principle and beneficial effects of the technical scheme are as follows: the scheme fault code identification sub-module is responsible for identifying fault codes and names of equipment; the processing measure identification sub-module is responsible for calling a pre-stored fault maintenance scheme according to the fault code; the equipment restarting sub-module is responsible for restarting the equipment with faults after the execution of the processing measure identification sub-module is finished, and alarming and overhauling by professional maintenance staff if the fault code still exists; the fault of the equipment is performed by the processing measure recognition submodule according to a preset program, so that the self-elimination and self-processing of the equipment fault are realized, the working pressure of overhauling staff is reduced, and the efficient work of the chemical fiber spinning air conditioner is ensured.
Example 9
As shown in fig. 6, on the basis of embodiment 1, the multifunctional intelligent control method of the chemical fiber spinning air conditioner provided by the embodiment of the application comprises the following steps:
s100: the temperature and humidity acquisition module acquires the temperature and humidity of the interior and the exterior of the environment provided with the chemical fiber spinning air conditioner, calculates a fresh air enthalpy value according to the temperature and the humidity of an outlet of the blower, calculates a return air enthalpy value according to the temperature and the humidity of an outlet of the return air machine, and calculates a fresh air enthalpy value and a return air enthalpy value of the chemical fiber spinning air conditioner;
s200: the operation parameter acquisition module acquires parameters in the operation process of the chemical fiber spinning air conditioner through a sensor, sends the parameters to the memory for standby, receives the result of parameter abnormality judgment, and displays the name and fault code of the equipment;
s300: the control module adjusts the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value through three distinguishing conditions, diagnoses the chemical fiber spinning air conditioner according to the operation parameters and gives out maintenance schemes.
The working principle and beneficial effects of the technical scheme are as follows: the method comprises the steps that firstly, a temperature and humidity acquisition module acquires the temperature and humidity of the interior and the exterior of an environment in which the chemical fiber spinning air conditioner is installed, and a fresh air enthalpy value and a return air enthalpy value of the chemical fiber spinning air conditioner are calculated; secondly, an operation parameter acquisition module acquires parameters in the operation process of the chemical fiber spinning air conditioner through a sensor and sends the parameters to a storage for standby; finally, the control module adjusts the size of a fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnoses the chemical fiber spinning air conditioner according to the operation parameters and gives out maintenance schemes; according to the embodiment, the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner are calculated, the working condition of the chemical fiber spinning air conditioner is judged according to the fresh air enthalpy value and the return air enthalpy value, and the corresponding control mode is adopted for control, so that the purpose of saving energy consumption is achieved, and the operation cost of enterprises is also reduced; the parameter acquisition module is added to acquire parameters in the operation process of the chemical fiber spinning air conditioner, the control module can acquire the operation conditions of all devices in time, the replacement time is set for the consumable devices, the chemical fiber spinning air conditioner is diagnosed according to the operation parameters, a maintenance scheme is provided, the chemical fiber spinning air conditioner is ensured to be in a good operation environment, the chemical fiber spinning air conditioner is enabled to operate efficiently, meanwhile, the quality and the quality of chemical fiber spinning production are improved, and the production benefit of enterprises is increased.
Example 10
Based on embodiment 9, the three discrimination conditions provided in the embodiment of the present application include:
the first judging condition is in charge of adopting fresh air to run when the fresh air enthalpy value is greater than the return air enthalpy value, regulating a fresh air valve to the maximum, cooling air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second judging condition is in charge of ventilation only when the fresh air enthalpy value is smaller than the return air enthalpy value, and the fresh air valve is adjusted to be minimum;
the third judging condition is responsible for keeping the current state of the regulating fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value;
the working principle and beneficial effects of the technical scheme are as follows: when the fresh air enthalpy value is larger than the return air enthalpy value, the first judgment condition of the scheme adopts the fresh air operation, adjusts the fresh air valve to the maximum value, cools the air and then sends the cooled air into the internal environment of the chemical fiber spinning air conditioner; when the fresh air enthalpy value is smaller than the return air enthalpy value, the second discrimination condition is that ventilation is only carried out, and the fresh air valve is regulated to be minimum; the third discrimination condition is that when the fresh air enthalpy value is equal to the return air enthalpy value, the current state of the fresh air valve is kept; according to the embodiment, three distinguishing conditions are adopted to realize the opening and closing of the fresh air valve, so that on one hand, the efficient operation of the chemical fiber spinning air conditioner is guaranteed, on the other hand, the energy conservation and emission reduction are realized, and the chemical fiber spinning air conditioner can change according to the temperature and humidity change of the environment.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. A multifunctional intelligent control system of a chemical fiber spinning air conditioner is characterized by comprising
The temperature and humidity acquisition module is responsible for acquiring the temperature and humidity of the interior and the exterior of the environment in which the chemical fiber spinning air conditioner is installed, and calculating the fresh air enthalpy value and the return air enthalpy value of the chemical fiber spinning air conditioner;
the operation parameter acquisition module is in charge of acquiring parameters of the chemical fiber spinning air conditioner in the operation process through a sensor and sending the parameters to the storage for standby;
the control module is connected with the temperature and humidity acquisition module and the operation parameter acquisition module and is responsible for adjusting the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value, diagnosing the chemical fiber spinning air conditioner according to the operation parameters and giving a maintenance scheme;
humiture collection module includes:
the temperature measurement submodule is responsible for setting temperature sensors at the outlet of the blower and the inlet of the return air machine and measuring the temperatures of the outlet of the blower and the inlet of the return air machine;
the temperature measurement submodule includes: a temperature compensation unit for temperature compensation by arranging a temperature sensor at the outlet of the blower and the inlet of the return air machine; the compensation function x (T) of the temperature compensation unit is expressed as:
the lower limit of the compensation function x (T) is:
wherein T represents the temperature of the temperature sensor to be compensated, T ε T 1 ，T 2 ，T 1 Representing the temperature of the blower outlet air; t (T) 2 Indicating the temperature of the air at the outlet of the air returning machine; ω represents a constant in temperature compensation adjustment, typically 0.10, k represents the compensation force for adjusting the resistance value, R represents the resistance value in the temperature sensor,represented at T 1 Resistance value in temperature sensor at temperature, < >>Represented at T 2 Temperature time and temperatureResistance value in the degree sensor, I R Representing the acquired resistance value of the temperature to be compensated, y representing the resistance value function at the sampling time t, Ω representing the resistance value at the sampling time t, A R An initial value representing the resistance of the temperature sensor;
the humidity measurement submodule is responsible for setting humidity sensors at the blower outlet and the air return inlet and measuring the humidity of the blower outlet and the air return inlet;
the fresh air enthalpy value calculating submodule is responsible for calculating fresh air enthalpy value according to the temperature and the humidity of the outlet of the blower;
the calculation formula of the fresh air enthalpy value:
i 1 ＝(1.01+1.84D 1 )T 1 +2500dD 1
the calculation formula of the return air enthalpy value:
i 2 ＝(1.01+1.84D 2 )T 2 +2500D 2
wherein i is 1 Represents the enthalpy value of fresh air, D 1 Indicating humidity of outlet air of blower, T 1 Representing the temperature of the blower outlet air; i.e 2 Indicating the enthalpy of return air, D 2 Indicating the humidity of the air at the outlet of the air return machine, T 2 Indicating the temperature of the air at the outlet of the air returning machine;
the return air enthalpy value calculation submodule is responsible for calculating the return air enthalpy value according to the temperature and the humidity of an outlet of the return air machine;
the humidity measurement submodule comprises a humidity compensation unit which is responsible for calibrating a humidity sensor; a humidity compensation unit comprising:
a humidity control subunit, responsible for providing control signals for humidity sensor calibration;
the humidity compensation subunit is responsible for coating a sensitive film on a measurement channel of the humidity sensor, and coating a biaxially oriented polypropylene film on a reference channel of the humidity sensor;
a control module, comprising:
the first judging condition sub-module is responsible for adopting fresh air to run when the fresh air enthalpy value is larger than the return air enthalpy value, regulating the fresh air valve to the maximum, cooling the air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second discrimination condition submodule is in charge of only ventilating when the fresh air enthalpy value is smaller than the return air enthalpy value, and regulating the fresh air valve to be minimum;
the third discrimination condition sub-module is responsible for keeping the current state of the regulating fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value;
the fresh air valve adjusting sub-module is responsible for receiving the instructions of the first judging condition sub-module, the second judging condition sub-module and the third judging condition sub-module, opening and closing the fresh air valve and changing the lift of the fresh air valve through the adjusting unit, and the adjusting unit comprises a damping current sub-unit and a motor sub-unit, wherein the damping current sub-unit decelerates a motor running when the fresh air valve is closed according to the speed; the motor subunit drives the fresh air valve to open and close through the transmission device;
an operating parameter acquisition module comprising:
the state parameter acquisition submodule is responsible for acquiring state parameters of each device of the chemical fiber spinning air conditioner in operation by adopting a sensor;
the parameter abnormality judging sub-module is in charge of receiving the state parameters acquired by the state parameter acquisition sub-module, comparing the state parameters with preset standard state parameters, and judging that the state parameters are abnormal when exceeding a threshold value;
and the abnormality display sub-module is responsible for receiving the result of the parameter abnormality judgment sub-module and displaying the name and fault code of the equipment.
2. The multifunctional intelligent control system of a chemical fiber spinning air conditioner according to claim 1, wherein the parameter abnormality judgment sub-module comprises:
the threshold setting unit comprises a first threshold, a second threshold and a third threshold, the chemical fiber spinning air conditioner is operated under at least five working conditions, the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are recorded, the boundary values of the frequency of the vibration of the shell, the replacement period of the vulnerable material and the operation parameters of the electrical equipment under each working condition are calculated respectively, and the boundary values are averaged to obtain the first threshold, the second threshold and the third threshold;
the first parameter judging unit is responsible for comparing the frequency of the shell vibration of the chemical fiber spinning air conditioner with a first threshold value, and sending the frequency to the abnormal display submodule for display when the frequency exceeds the first threshold value;
the second parameter judging unit is responsible for monitoring the replacement period of the vulnerable materials used by the chemical fiber spinning air conditioner, and sending the vulnerable materials to the abnormal display submodule for display when the vulnerable materials exceed a second threshold value;
and the third parameter judging unit is responsible for detecting the operation parameters of the electrical equipment of the chemical fiber spinning air conditioner, and sending the operation parameters to the abnormal display submodule for display if the operation parameters exceed a third threshold value.
3. The multifunctional intelligent control system of a chemical fiber spinning air conditioner according to claim 1, wherein the control module further comprises:
the fault code identification sub-module is responsible for identifying fault codes and names of equipment;
the processing measure identification sub-module is responsible for calling a pre-stored fault maintenance scheme according to the fault code;
and the equipment restarting sub-module is responsible for restarting the equipment with faults after the execution of the processing measure identification sub-module is finished, and alarming and overhauling by professional maintenance staff if the fault code still exists.
4. The multifunctional intelligent control method of the chemical fiber spinning air conditioner is characterized by comprising the following steps of:
the temperature and humidity acquisition module acquires the temperature and humidity of the interior and the exterior of the environment provided with the chemical fiber spinning air conditioner, calculates a fresh air enthalpy value according to the temperature and the humidity of an outlet of the blower, calculates a return air enthalpy value according to the temperature and the humidity of an outlet of the return air machine, and calculates a fresh air enthalpy value and a return air enthalpy value of the chemical fiber spinning air conditioner;
the humiture acquisition module still includes: the temperature measuring sub-module is responsible for arranging a temperature compensation unit for temperature compensation by a temperature sensor at the outlet of the blower and the inlet of the return air machine; the compensation function x (T) of the temperature compensation unit is expressed as:
the lower limit of the compensation function x (T) is:
wherein T represents the temperature of the temperature sensor to be compensated, T ε T 1 ，T 2 ，T 1 Representing the temperature of the blower outlet air; t (T) 2 Indicating the temperature of the air at the outlet of the air returning machine; ω represents a constant in temperature compensation adjustment, typically 0.10, k represents the compensation force for adjusting the resistance value, R represents the resistance value in the temperature sensor,represented at T 1 Resistance value in temperature sensor at temperature, < >>Represented at T 2 Resistance value, I in temperature sensor at temperature R Representing the acquired resistance value of the temperature to be compensated, y representing the resistance value function at the sampling time t, θ representing the resistance value at the sampling time t, A R An initial value representing the resistance of the temperature sensor;
the operation parameter acquisition module acquires parameters in the operation process of the chemical fiber spinning air conditioner through a sensor, sends the parameters to the memory for standby, receives the result of parameter abnormality judgment, and displays the name and fault code of the equipment;
the control module adjusts the size of the fresh air valve according to the fresh air enthalpy value and the return air enthalpy value through three distinguishing conditions, diagnoses the chemical fiber spinning air conditioner according to the operation parameters and gives out maintenance schemes;
the calculation formula of the fresh air enthalpy value:
i 1 ＝(1.01+1.84D 1 )T 1 +2500dD 1
the calculation formula of the return air enthalpy value:
i 2 ＝(1.01+1.84D 2 )T 2 +2500D 2
wherein i is 1 Represents the enthalpy value of fresh air, D 1 Indicating humidity of outlet air of blower, T 1 Representing the temperature of the blower outlet air; i.e 2 Indicating the enthalpy of return air, D 2 Indicating the humidity of the air at the outlet of the air return machine, T 2 Indicating the temperature of the air at the outlet of the air returning machine;
three discrimination conditions, including:
the first judging condition is in charge of adopting fresh air to run when the fresh air enthalpy value is greater than the return air enthalpy value, regulating a fresh air valve to the maximum, cooling air and then sending the cooled air into the internal environment of the chemical fiber spinning air conditioner;
the second judging condition is in charge of ventilation only when the fresh air enthalpy value is smaller than the return air enthalpy value, and the fresh air valve is adjusted to be minimum;
and the third judging condition is responsible for keeping the current state of the fresh air valve when the fresh air enthalpy value is equal to the return air enthalpy value.
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