CN110260431B - Control method of air conditioning system of textile workshop - Google Patents
Control method of air conditioning system of textile workshop Download PDFInfo
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- CN110260431B CN110260431B CN201910421346.1A CN201910421346A CN110260431B CN 110260431 B CN110260431 B CN 110260431B CN 201910421346 A CN201910421346 A CN 201910421346A CN 110260431 B CN110260431 B CN 110260431B
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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
- F24F11/62—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
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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
- F24F11/62—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
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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
- F24F11/70—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
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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
- F24F11/70—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
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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
- F24F11/70—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
- F24F11/85—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 variable-flow pumps
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0245—Manufacturing or assembly of air ducts; Methods therefor
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/04—Air-mixing units
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
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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
- F24F6/00—Air-humidification, e.g. cooling by humidification
- F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
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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
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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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]
- Y02B30/54—Free-cooling systems
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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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
In the textile workshop air conditioning system control system, the temperature and humidity sensor detects the temperature value and the relative humidity value of the current air conditioning workshop
The controller calculates the moisture content d of the current air conditioning workshop according to the temperature and humidity values S Judging the moisture content d S With a target moisture content d N The magnitude relationship of (d) is | (d) S ‑d N )/d N L, |; when the delta d is judged to be less than or equal to the error threshold value, the controller controls the frequency of the spray pump to be kept unchanged; at the time of determining Δ d>When the error threshold is reached, further judging whether d is present S <d N When the frequency of the spray pump is controlled by the time controller to be increased until d S ＝d N (ii) a At d S >d N Then, the relative humidity value is judged
And target relative humidity value
In the size of
When the controller controls the frequency of the spray pump to be reduced until d S ＝d N In a
In time, the controller controls the frequency of the spray pump to increase until d S ＝d N At d S ＝d N And when the spraying pump is used, the PLC controls the frequency of the spraying pump to be kept unchanged.
Description
Technical Field
The invention relates to the technical field of system control strategies, in particular to a control method of an air conditioning system of a textile workshop.
Background
The textile industry is a traditional industry closely related to the livelihood of people and is also a traditional labor-intensive industry, and the textile industry gradually changes to the automation direction along with the continuous adjustment of national industrial policies and the continuous improvement of technical levels. The production workshops of textile enterprises have high requirements on temperature and humidity, the constant temperature and the constant humidity are kept under the ordinary condition, and the temperature and the humidity can be continuously changed along with the change of seasons and weather even in the same workshop, so that the textile air conditioner of the workshop is required to be continuously adjusted.
The automatic control system of the textile air conditioner suitable for the characteristics of the textile air conditioner is developed by the Swiss LUWA company (Luwa air engineering Co., Ltd.) in the eighties of the twentieth century, and the full automatic control technology of the textile air conditioner is developed and obtained with certain achievements earlier by the Henan Yingshui environmental protection engineering Co., Ltd (formerly named: Zheng Zhongshui Yingshui environmental protection engineering Co., Ltd.) and the applicant company in China. However, the current commonly used textile air conditioner control method, such as the Chinese invention patent: according to the control method (No. CN104214911B) of the composite PLC air-conditioning automatic control system in the textile mill, the humidity of a workshop is taken as a primary object to be adjusted according to the principle of 'humidity priority', then the temperature is adjusted after the humidity meets the requirement, and according to the description in the 34 th section of the specification, after the temperature meets the requirement, the workshop is subjected to equal-humidity temperature rise or equal-humidity temperature reduction to reach the required temperature; however, in the actual adjusting process, due to the coupling relationship between temperature and humidity, the control process of constant-humidity temperature rise or constant-humidity temperature fall is very complicated, and it is difficult to achieve accurate control.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a novel control method for an air conditioning system of a textile workshop.
The invention solves the technical problems through the following technical scheme:
the invention provides a textile workshop air conditioning system control system which is characterized by comprising a spray room, a secondary return air channel, an air supply channel, an air conditioning workshop, a PLC (programmable logic controller) and a secondary air mixing channel, wherein a spray pump is arranged below the spray room, return air in the secondary return air channel is mixed with air blown out from the spray room in the secondary air mixing channel after passing through a secondary return air adjusting window, and then mixed gas is sent into the air conditioning workshop through the air supply channel, an air feeder is arranged on the air supply channel, a temperature and humidity sensor is arranged in the air conditioning workshop, and the spray pump, the secondary return air adjusting window, the air feeder and the temperature and humidity sensor are all connected with the PLC;
the temperature and humidity sensor is used for detecting the temperature value and the relative humidity value of the current air-conditioning workshop
And transmitting to the PLC controller;
the PLC is used for calculating the moisture content d of the current air-conditioning workshop according to the temperature value and the relative humidity value S Judging the moisture content d S And target moisture content d N The magnitude relationship of (d) is | (d) S -d N )/d N |；
When the delta d is judged to be less than or equal to the error threshold value, the PLC controller controls the frequency of the spraying pump to be kept unchanged;
at the time of determining Δ d>When the error threshold is reached, further judging whether d is present S <d N When the moisture content is higher than the preset moisture content, the PLC controls the frequency of the spray pump to be increased until the moisture content is higher than the preset moisture content S Target moisture content d N ；
At d S >d N Then, the relative humidity value is judged
And target relative humidity value
In the relative humidity value of
Greater than target relative humidity value
In time, the PLC controller controls the frequency of the spray pump to be reduced until the moisture content d S To the target moisture content d N At a relative humidity value
Less than target relative humidity value
In time, the PLC controller controls the frequency of the spray pump to increase until the moisture content d S Target moisture content d N At a moisture content d S To the target moisture content d N And when the spraying pump is used, the PLC controls the frequency of the spraying pump to be kept unchanged.
Preferably, the PLC is used for judging whether the delta d is less than or equal to the error threshold value according to the relative humidity value
Relative humidity value to target
Deviation between, regulating the frequency of the blower orSecondary return air regulating window opening to make relative humidity value
Reach the target relative humidity value
Preferably, the relative humidity value
Relative humidity value to target
When the deviation falls within a first set range, the frequency of the blower is adjusted so that the relative humidity value
Reach the target relative humidity value
Relative humidity value
Relative humidity value to target
When the deviation between the two is within the second set range, the opening degree of the secondary return air adjusting window is adjusted to enable the relative humidity value
Reach the target relative humidity value
Wherein, the first setting range is larger than the second setting range.
Preferably, Δ d is determined>Error threshold value and d S <d N According to the relative humidity value
Relative humidity value to target
The frequency of the blower or the opening degree of the secondary return air adjusting window is adjusted so that the relative humidity value is adjusted
Reach the target relative humidity value
Preferably, the relative humidity value
Relative humidity value to target
When the deviation falls within a first set range, the frequency of the blower is adjusted so that the relative humidity value
Reach the target relative humidity value
Relative humidity value
Relative humidity value with target
When the deviation between the two is within the second set range, the opening degree of the secondary return air adjusting window is adjusted to enable the relative humidity value
Reach the target relative humidity value
Wherein, the first isThe setting range is larger than the second setting range.
Preferably, Δ d is determined>Error threshold value and d S >d N According to the relative humidity value
Relative humidity value to target
The frequency of the blower or the opening degree of the secondary return air adjusting window is adjusted so that the relative humidity value is adjusted
Reach the target relative humidity value
Preferably, the relative humidity value
Relative humidity value to target
When the deviation falls within a first set range, the frequency of the blower is adjusted so that the relative humidity value
Reach the target relative humidity value
Relative humidity value
Relative humidity value to target
When the deviation between the two is within the second set range, the opening degree of the secondary return air adjusting window is adjusted to enable the relative humidity value
Reach the target relative humidity value
Wherein, the first setting range is larger than the second setting range.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
(1) the accurate control of the temperature and the humidity of the spinning workshop can be realized, and the temperature is effectively ensured while the humidity control is realized;
(2) the water pump and the air feeder are parallel control loops, so that when the temperature and the humidity of a workshop deviate, the adjustment speed is high, and overshoot cannot occur;
(3) the change of the air supply state point along the equal moisture content line is the realization of the theory of the air treatment process, the increase and decrease of the workshop load are met through the change of the air volume of the air feeder, and meanwhile, the energy conservation of the fan is realized by utilizing the frequency conversion of the fan.
Drawings
FIG. 1 is a schematic structural diagram of a control system of an air conditioning system in a textile workshop according to a preferred embodiment of the invention;
FIG. 2 is a control flow chart of the air conditioning system control system of the textile workshop according to the preferred embodiment of the present invention;
wherein, 1: fresh air channel, 11: fresh air adjusting window, 12: fresh air temperature and humidity sensor, 2: primary return air channel, 21: ground return air passage, 22: ground return air adjusting window, 23: external suction type dust filter, 24: fan, 25: ground exhaust adjusting window, 26: technological return air channel, 27: process return air regulating window, 28: technological exhaust adjusting window, 29: technological return air temperature sensor, 3: spray chamber, 31: temperature sensor, 32: spray pump, 4: secondary return air channel, 41: secondary return air adjusting window, 5: air blowing passage, 51: blower, 6: air-conditioning plant, 61: temperature and humidity sensor, 7: PLC controller, 8: primary air mixing channel, 9: and a secondary air mixing channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, this embodiment provides a schematic structural diagram of a control system of an air conditioning system in a textile workshop, in which a dashed line indicates a PLC control circuit, a solid line indicates an air passage, and an arrow direction indicates an air flow direction.
The textile workshop air conditioning system control system comprises a fresh air channel 1, the fresh air channel 1 and a primary return air channel 2 are connected with a spray room 3 after being mixed through a primary air mixing channel 8, a fresh air adjusting window 11 is arranged on the fresh air channel 1, a fresh air temperature and humidity sensor 12 is arranged at the front end of the fresh air adjusting window 11, and the fresh air adjusting window 11 and the fresh air temperature and humidity sensor 12 are connected with a PLC (programmable logic controller) 7; the primary air return channel 2 comprises a ground air return channel 21 and a process air return channel 26, the ground air return channel 21 and the process air return channel 26 are both led out from the air-conditioning workshop 6, the ground air return channel 21 is led out from the air-conditioning workshop 6 and then sequentially connected with an external suction type dust filter 23 and a fan 24, the ground air return is conveyed by the fan 24, part of the ground air return is discharged through a ground air exhaust adjusting window 25, part of the ground air return enters the primary air mixing channel 8 through the ground air return adjusting window 22, and part of the ground air return enters the secondary air return channel 4; the process return air channel 26 is led out from the air-conditioning workshop 6 and then sequentially connected with the external suction type dust filter 23, the fan 24 and the process return air temperature sensor 29, the process return air is conveyed by the fan 24, is partially discharged through the process air exhaust adjusting window 28, partially enters the primary air mixing channel 8 through the process return air adjusting window 27, and partially enters the secondary return air channel 4, and the fan 24, the temperature sensor 29, the ground air exhaust adjusting window 25, the ground return air adjusting window 22, the process return air adjusting window 27 and the process air exhaust adjusting window 28 are all connected with the PLC 7; the spray chamber 3 is composed of spray rows, a water baffle, a guide plate and other components, a temperature sensor 31 is arranged at the air outlet end of the spray chamber 3, a spray pump 32 is arranged below the air outlet end, and the temperature sensor 31 and the spray pump 32 are both connected with the PLC 7; the return air in the secondary return air channel 4 is mixed with the air blown out from the spray room 3 in the secondary air mixing channel 9 through the secondary return air adjusting window 41, and then the mixed gas is sent into the air-conditioning workshop 6 through the air supply channel 5, the air supply channel 5 is provided with the blower 51, the temperature and humidity sensor 61 is arranged in the air-conditioning workshop 6, and the secondary return air adjusting window 41, the blower 51 and the temperature and humidity sensor 61 are all connected with the PLC 7.
The temperature sensors all adopt TOC-T1-W2 of Switzerland Wittimaoto (Vector), the detection precision of the temperature sensors can reach +/-0.2 ℃, and the temperature and humidity sensors adopt TOC-H1T1 temperature and humidity sensors of Switzerland Wittimaoto (Vector) (the temperature detection precision is +/-0.2 ℃, and the humidity detection precision is +/-2.3% RH) or EE210-HT temperature and humidity sensors of Austria E + E (the temperature detection precision is +/-0.2 ℃, and the humidity detection precision is +/-2% RH).
FIG. 2 is a logic diagram of humidity control of the air conditioning system of the textile workshop according to the present invention, which is based on workshop design parameters, i.e. set temperature t N Relative humidity of
Calculating the moisture content d of the corresponding design state N (the calculation formula refers to air conditioning of textile mill (third edition) written by Zhouyu element, etc.), since the moisture dispersion amount of the spinning workshop is very small, the cold load of the workshop can be considered as the sensible heat load, and the processed air changes along the vertical line at the air supply state point, namely the moisture content line changes towards the indoor state point. In the automatic control process, a standard humid air enthalpy diagram of a local area is generated through ECOTECT software to determine an air supply state point, the frequency of a spray pump 32 is changed to increase or reduce the moisture content of air supply, so that the moisture content of the air in a workshop is slightly changed near a set value, and at the moment, the frequency of an air supply machine 51 is changed to ensure that the air supply state point always follows the moisture content d of a design state N The line is changed up and down, the air supply load requirement of a workshop is met by utilizing the air volume changing function of the fan, and the temperature is correspondingly controlled while the humidity of the workshop is met. To achieve this function, the following control strategy is implemented:
the temperature and humidity sensor 61 is used for detecting the temperature value and the relative humidity value of the current air-conditioning workshop
And transmitted to the PLC controller 7.
The PLC 7 is used for calculating the moisture content d of the current air-conditioning workshop according to the temperature value and the relative humidity value S Judging the moisture content d S With a target moisture content d N The magnitude relation Δ d ═ l (d) S -d N )/d N |。
The PLC 7 is used for controlling the frequency of the spraying pump 32 to be kept unchanged when the error threshold (for example, 2%) is judged to be less than or equal to deltad; and, according to the relative humidity value
Relative humidity value to target
The frequency of the blower 51 or the opening degree of the secondary return air control window 41 is controlled so that the relative humidity value is changed
Reach the target relative humidity value
In particular, relative humidity value
Relative humidity value to target
The frequency of the blower 51 is adjusted so that the relative humidity value falls within a first set range
Reach the target relative humidity value
Relative humidity value
Relative humidity value with target
When the deviation falls within the second set range, the opening degree of the secondary return air adjusting window 41 is adjusted so that the relative humidity value becomes higher
Reach the target relative humidity value
Wherein, the first setting range is larger than the second setting range.
The PLC controller 7 is used for judging delta d>When the error threshold value is (for example, 2%), it is further determined whether d is present S <d N When it is, the frequency of the shower pump 32 is controlled to be increased until the moisture content d is reached S To the target moisture content d N (ii) a And, according to the relative humidity value
Relative humidity value to target
The frequency of the blower 51 or the opening degree of the secondary return air adjusting window 41 is adjusted so that the relative humidity value becomes different from each other
Reach the target relative humidity value
In particular, relative humidity value
Relative humidity value to target
The frequency of the blower 51 is adjusted so that the relative humidity value falls within a first set range
Reach the target relative humidity value
Relative humidity value
Relative humidity value to target
When the deviation falls within the second set range, the opening degree of the secondary return air adjusting window 41 is adjusted so that the relative humidity value becomes higher
Reach the target relative humidity value
Wherein, the first setting range is larger than the second setting range.
The PLC controller 7 is used for controlling d S >d N Then, the relative humidity value is judged
And target relative humidity value
In the relative humidity value of
>Target relative humidity value
The frequency of the spray pump 32 is controlled to decrease until the moisture content d is reached S Achieve the purpose ofTarget moisture content d N And, according to the relative humidity value
Relative humidity value to target
The frequency of the blower 51 or the opening degree of the secondary return air control window 41 is controlled so that the relative humidity value is changed
Reach the target relative humidity value
The PLC controller 7 is used for controlling d S >d N And relative humidity value
<Target relative humidity value
The frequency of the spray pump 32 is controlled to increase until the moisture content d is reached S Target moisture content d N And, according to the relative humidity value
Relative humidity value with target
The frequency of the blower 51 or the opening degree of the secondary return air control window 41 is controlled so that the relative humidity value is changed
Reach the target relative humidity value
The PLC controller 7 is used for controlling the moisture content d S To achieve the target moisture contentd N The frequency of the spray pump 32 is controlled to remain constant.
And selecting a certain workshop air conditioning system of a certain textile enterprise in Wuxi city of Jiangsu province to perform detailed description on the control and regulation of the air temperature and humidity of the workshop.
An enthalpy-humidity map is generated by using ECOTECT software according to local parameters such as seasons, temperature, humidity and atmospheric pressure, a flower cleaning workshop in spring and autumn is selected, the temperature requirement is 24-28 ℃, and the relative humidity requirement is 60-65% RH. Taking the temperature median value of 26 ℃ and the relative humidity of 65% RH as the set state parameters of the workshop, and calculating the set moisture content d according to a formula N 13.6g/kg dry air.
1. On a certain day, the actually measured temperature of the workshop is 26.5 ℃, the relative humidity is 63% RH, and the calculated moisture content d S 13.7g/kg dry air, 0.7% delta d (not more than 2%, and the temperature and humidity values meet the set parameter requirements), d indicating that the air supply state point is in the design state N And the current operating frequency of the spray pump 32 is maintained unchanged.
2. On a certain day, the actual measurement temperature of the workshop is 28 ℃, the relative humidity is 57% RH, and the calculated moisture content d S 13.4g/kg dry air, 1.5% delta d (not more than 2%, but the temperature and humidity values do not meet the set parameter requirements), d indicating that the air supply state point is in the design state N And the current operating frequency of the spray pump 32 is maintained unchanged. The deviation of the relative humidity is calculated by comparing with the designed value, then the PLC automatic control program outputs a PI value, the secondary return air adjusting window 41 and the blower 51 form a sequence control loop, for example, the range of the control PI value of the secondary return air adjusting window 41 is 0-0.5, the range of the control PI value of the blower 51 is 0.5-1, if the PI value is in the range of 0.5-1, and the deviation is large, the frequency of the blower 51 is adjusted. If the PI value is in the range of 0 to 0.5, only the opening degree of the secondary return air adjusting window 41 is adjusted.
3. On a certain day, the actually measured temperature of the workshop is 26 ℃, the relative humidity is 60% RH, and the calculated moisture content d S 12.6g/kg dry air,. DELTA.d 7.4% (case greater than 2%, and moisture content d of the plant) S Less than a set moisture content d N ) (at this time, the frequency of the spray pump should be increased, and the moisture content of the supplied air should be increased until the temperature is reducedMeasured moisture content d of the workshop S Meets the design requirement), at the moment, according to the deviation of the moisture content deltad, a self-control program PLC calculates a PI value to increase the frequency of the spray pump 32, meanwhile, a workshop actual measurement parameter calculates the current moisture content to be compared with a set value, and the self-control program outputs the PI value in such a way to adjust the frequency of the spray pump 32 until the moisture content meets the set requirement. The loop a of the automatic control program calculates a corresponding PI value based on the deviation of the relative humidity, and automatically controls the opening degree of the blower 51 or the secondary return air adjusting window 41 based on the magnitude of the PI value. The secondary return air adjusting window 41 and the blower 51 constitute a sequence control loop, for example, the control PI value range of the secondary return air adjusting window 41 is 0-0.5, the control PI value range of the blower 51 is 0.5-1, if the PI value is in the range of 0.5-1 and the deviation is large, the frequency of the blower 51 is adjusted. If the PI value is in the range of 0 to 0.5, only the opening of the secondary return air adjusting window 41 is adjusted.
4. On a certain day, the actually measured temperature of the workshop is 26 ℃, the relative humidity is 70% RH, and the calculated moisture content d S 14.7g/kg dry air, Δ d 8.1% (case greater than 2%, and moisture content d of the plant S Greater than a set moisture content d N Actually measuring the relative humidity in the workshop
>Design relative humidity
) At the moment, according to the size of the delta d, the automatic control program PLC calculates a PI value to reduce the frequency of the spray pump 32, meanwhile, the actual measurement parameters of the workshop calculate the current moisture content to be compared with a set value, and the automatic control program outputs the PI value to adjust the frequency of the spray pump 32 until the moisture content meets the set requirement. If the delta d is within 2 percent and the temperature and humidity of the workshop still do not meet the design requirements, the previous case 2 process is carried out. The loop a of the automatic control program calculates a corresponding PI value based on the deviation of the relative humidity, and automatically decreases the frequency of the blower 51 or increases the opening of the secondary return air control window 41 based on the value. The secondary return air control window 41 and the blower 51 form a sequence control loop, for example, the control PI value range of the secondary return air control window 41 is 0-0.5, and the blower 51The range of the control PI value is 0.5-1, if the PI value is in the interval of 0.5-1 and the deviation is large, the frequency of the blower 51 is adjusted. If the PI value is in the range of 0 to 0.5, only the opening degree of the secondary return air adjusting window 41 is adjusted.
5. On a certain day, the actual temperature of the workshop is 29 ℃, the relative humidity is 58% RH, and the moisture content d is calculated S 14.7g/kg dry air,. DELTA.d 8.1% (case greater than 2%, and moisture content d of the plant) S Greater than a set moisture content d N Actually measuring the relative humidity in the workshop
<Design relative humidity
) The automatic control program executes the humidity priority strategy, at this moment, although delta d is larger than 2%, the humidity is smaller than the set value, so the humidifying automatic control program is executed, namely, the deviation of the relative humidity measured in the workshop and the set value is calculated, the PI value is calculated by the automatic control degree, the frequency of the spraying pump 32 is increased, meanwhile, the current relative humidity is calculated by the measured workshop parameters and compared with the set value, the PI value is output by the automatic control program, the frequency of the spraying pump 32 is adjusted until the humidity content d is reached S And the set requirements are met. Meanwhile, the loop A of the automatic control program calculates a corresponding PI value according to the deviation of the relative humidity, and automatically increases the frequency of the blower 51 or reduces the opening degree of the secondary return air regulating window 41 according to the value. The secondary return air control window 41 and the blower 51 constitute a sequence control circuit, for example, the control PI value range of the secondary return air control window 41 is 0 to 0.5, the control PI value range of the blower 51 is 0.5 to 1, and if the PI value is in the interval of 0.5 to 1 and the deviation is large, the frequency of the blower 51 is adjusted. If the PI value is in the range of 0 to 0.5, only the opening degree of the secondary return air adjusting window 41 is adjusted.
The realization of humidity control logic, the serial control of secondary return air and the blower is realized into a control loop A, the spray pump is independently used as a control loop B, and the two loops are connected in parallel and act simultaneously. And the loop A realizes sequence control according to the deviation of the relative humidity and the relative humidity in a designed state, and the loop B performs frequency control of the spraying pump according to the deviation of the moisture content.
While specific embodiments of the invention have been described above, it will be understood by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (6)
1. A control system of an air conditioning system of a textile workshop is characterized by comprising a spray room, a secondary return air channel, an air supply channel, an air conditioning workshop, a PLC (programmable logic controller) and a secondary air mixing channel, wherein a spray pump is arranged below the spray room, return air in the secondary return air channel is mixed with air blown out of the spray room through a secondary return air adjusting window in the secondary air mixing channel and then sends mixed gas into the air conditioning workshop through the air supply channel, an air feeder is arranged on the air supply channel, a temperature and humidity sensor is arranged in the air conditioning workshop, and the spray pump, the secondary return air adjusting window, the air feeder and the temperature and humidity sensor are all connected with the PLC;
the temperature and humidity sensor is used for detecting the temperature value and the relative humidity value of the current air-conditioning workshop
And transmitting to the PLC controller;
the PLC is used for calculating the moisture content d of the current air-conditioning workshop according to the temperature value and the relative humidity value S Judging the moisture content d S And target moisture content d N The magnitude relationship of (d) is | (d) S -d N )/d N |；
When the delta d is judged to be less than or equal to the error threshold value, the PLC controller controls the frequency of the spraying pump to be kept unchanged;
at the time of determining Δ d>When the error threshold is reached, further judging whether d is present S <d N When the moisture content is higher than the preset moisture content, the PLC controls the frequency of the spray pump to be increased until the moisture content is higher than the preset moisture content S To the target moisture content d N ；
At d S >d N Then, the relative humidity value is judged
And target relative humidity value
In the relative humidity value of
Greater than target relative humidity value
In the process, the PLC controller controls the frequency of the spray pump to be reduced until the moisture content d S Target moisture content d N At a relative humidity value
Less than target relative humidity value
In time, the PLC controller controls the frequency of the spray pump to increase until the moisture content d S To the target moisture content d N At a moisture content d S To the target moisture content d N When the frequency of the spraying pump is not changed, the PLC controller controls the frequency of the spraying pump to be kept unchanged;
the PLC is used for judging whether the delta d is less than or equal to the error threshold value according to the relative humidity value
Relative humidity value to target
The frequency of the blower or the opening degree of the secondary return air adjusting window is adjusted so that the relative humidity value is adjusted
Reach the target relative humidity value
2. The textile mill room air conditioning system control system of claim 1, wherein the relative humidity value
Relative humidity value to target
When the deviation falls within a first set range, the frequency of the blower is adjusted so that the relative humidity value
Reach the target relative humidity value
Relative humidity value
Relative humidity value to target
When the deviation between the two is within the second set range, the opening degree of the secondary return air adjusting window is adjusted to enable the relative humidity value
Reach the target relative humidity value
Wherein the first setting range is larger than the second setting range.
3. Textile mill hall according to claim 1The system control system is characterized in that the system control system judges delta d>Error threshold value and d S <d N According to the relative humidity value
Relative humidity value to target
The frequency of the blower or the opening degree of the secondary return air adjusting window is adjusted so that the relative humidity value is adjusted
Reach the target relative humidity value
4. The textile mill room air conditioning system control system of claim 3, wherein the relative humidity value
Relative humidity value to target
When the deviation falls within a first set range, the frequency of the blower is adjusted so that the relative humidity value
Reach the target relative humidity value
Relative humidity value
Relative humidity value with target
When the deviation between the two falls within a second set range, the opening degree of the secondary return air adjusting window is adjusted to make the relative humidity value
Reach the target relative humidity value
Wherein the first setting range is larger than the second setting range.
5. The textile workshop air conditioning system control system of claim 1, wherein Δ d is determined at>Error threshold value and d S >d N According to the relative humidity value
Relative humidity value with target
The deviation between them, the frequency of the blower or the opening of the secondary return air adjusting window is adjusted so that the relative humidity value
Reach the target relative humidity value
6. The textile mill room air conditioning system control system of claim 5, wherein the relative humidity value
Relative humidity value to target
The deviation therebetween belonging to the firstAdjusting the frequency of the blower to make the relative humidity value at the time of setting the range
Reach the target relative humidity value
Relative humidity value
Relative humidity value to target
When the deviation between the two is within the second set range, the opening degree of the secondary return air adjusting window is adjusted to enable the relative humidity value
Reach the target relative humidity value
Wherein, the first setting range is larger than the second setting range.
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| CN114935206B (en) * | 2022-05-11 | 2024-04-05 | 合肥美的暖通设备有限公司 | Air conditioner, control method and device thereof and readable storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346128A (en) * | 1993-07-22 | 1994-09-13 | Honeywell Inc. | Humidity control system |
| JPH0882432A (en) * | 1994-09-12 | 1996-03-26 | Takasago Thermal Eng Co Ltd | Humidifying method and air conditioning system |
| CN201387087Y (en) * | 2009-04-16 | 2010-01-20 | 吴建 | Energy-saving low-temperature high-humidity air supply air-conditioning unit |
| CN202083077U (en) * | 2011-06-14 | 2011-12-21 | 吐鲁番溢达纺织有限公司 | Automatic control system of intelligent textile air conditioner |
| CN106152411A (en) * | 2016-07-25 | 2016-11-23 | 广东美的制冷设备有限公司 | The temperature/humidity control method of air-conditioner and device |
| CN107355942A (en) * | 2017-06-15 | 2017-11-17 | 西安建筑科技大学 | Air quantity variable air conditioner indoor temperature and humidity control method based on absolute humidity |
| CN107477796A (en) * | 2017-08-31 | 2017-12-15 | 四川酷比特科技有限公司 | Low-temp radiating type idle call fresh air dehumidifying system control method |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH689738A5 (en) * | 1994-11-07 | 1999-09-30 | Luwa Ag | Method and apparatus for air conditioning of the air-conditioned operation of textile machines equipped space. |
| CN201302256Y (en) * | 2008-10-31 | 2009-09-02 | 马力 | Textile air conditioner used constant temperature and humidity variable air volume control system |
| CN102778009B (en) * | 2012-07-11 | 2014-11-05 | 武汉裕生智能节能设备有限公司 | Temperature-humidity control device and method for variable-air-volume air-conditioning system |
| CN103234260A (en) * | 2013-05-02 | 2013-08-07 | 无锡长江精密纺织有限公司 | Textile air-conditioner control system based on intelligent sensor network technology |
| CN103528144B (en) * | 2013-10-11 | 2018-02-02 | 广州市设计院 | Fresh air variable air rate power-economizing method and device based on absolute humidity control |
| CN104214911B (en) * | 2014-09-12 | 2017-02-15 | 西安工程大学 | Control method of compound PLC (programmable logic controller) air conditioning automatic control system in textile mill |
| CN105318504B (en) * | 2015-11-23 | 2018-04-10 | 广东美的制冷设备有限公司 | The warm and humid dual control method and air-conditioning of air-conditioning |
| JP2017166716A (en) * | 2016-03-14 | 2017-09-21 | アンデックス株式会社 | Method for controlling water to air contact-type air conditioner and water to air contact-type air conditioner |
| CN106322598A (en) * | 2016-08-26 | 2017-01-11 | 张家港市金陵纺织有限公司 | Air-conditioning system for weaving workshop and control method of air-conditioning system |
| CN106500259A (en) * | 2016-10-28 | 2017-03-15 | 广州市高衡力节能科技股份有限公司 | Fan coil independent temperature-humidity control device based on absolute moisture content |
| CN106545937A (en) * | 2016-11-15 | 2017-03-29 | 河南华东工控技术有限公司 | Air conditioning system and control method between spinning |
| CN108518764A (en) * | 2018-03-15 | 2018-09-11 | 浙江盾安自控科技有限公司 | A kind of combined air processing group air-supply humiture accuracy-control system and method |
-
2019
- 2019-05-21 CN CN201910421346.1A patent/CN110260431B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5346128A (en) * | 1993-07-22 | 1994-09-13 | Honeywell Inc. | Humidity control system |
| JPH0882432A (en) * | 1994-09-12 | 1996-03-26 | Takasago Thermal Eng Co Ltd | Humidifying method and air conditioning system |
| CN201387087Y (en) * | 2009-04-16 | 2010-01-20 | 吴建 | Energy-saving low-temperature high-humidity air supply air-conditioning unit |
| CN202083077U (en) * | 2011-06-14 | 2011-12-21 | 吐鲁番溢达纺织有限公司 | Automatic control system of intelligent textile air conditioner |
| CN106152411A (en) * | 2016-07-25 | 2016-11-23 | 广东美的制冷设备有限公司 | The temperature/humidity control method of air-conditioner and device |
| CN107355942A (en) * | 2017-06-15 | 2017-11-17 | 西安建筑科技大学 | Air quantity variable air conditioner indoor temperature and humidity control method based on absolute humidity |
| CN107477796A (en) * | 2017-08-31 | 2017-12-15 | 四川酷比特科技有限公司 | Low-temp radiating type idle call fresh air dehumidifying system control method |
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