CN114135962B - Control method of fresh air handling unit - Google Patents

Control method of fresh air handling unit Download PDF

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Publication number
CN114135962B
CN114135962B CN202111098407.9A CN202111098407A CN114135962B CN 114135962 B CN114135962 B CN 114135962B CN 202111098407 A CN202111098407 A CN 202111098407A CN 114135962 B CN114135962 B CN 114135962B
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Prior art keywords
temperature
fresh air
control device
regulating valve
limit value
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CN202111098407.9A
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CN114135962A (en
Inventor
姚永明
刘庆利
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Jiangsu Gaoke Applied Science Research Institute Co ltd
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Jiangsu Gaoke Applied Science Research Institute Co ltd
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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
    • F24F7/007—Ventilation with forced flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F5/001—Compression cycle type
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a control method of a fresh air handling unit. The method comprises the steps of setting an upper limit value and a lower limit value of the precooled temperature and the air supply temperature and humidity; the fresh air temperature and humidity sensor, the temperature sensor and the air supply temperature and humidity sensor send fresh air temperature and humidity information, precooled temperature information and air supply temperature and humidity information which are respectively acquired by the fresh air temperature and humidity sensor and the air supply temperature and humidity sensor to the control device in real time; the control device generates a power supply start-stop instruction according to the received fresh air temperature and humidity information, pre-cooling temperature information and air supply temperature and humidity information, and combines the set upper limit value and lower limit value of the pre-cooling temperature and the air supply temperature and humidity, and controls the work of a device corresponding to the fresh air handling unit according to the power supply start-stop instruction. Compared with the traditional method, the method is simpler, the control logic of the fresh air handling unit is simple and clear, and the equipment stability is improved; and can guarantee that the compressor is operating under rated condition when external operating mode changes, guarantee the invariable of air supply humiture.

Description

Control method of fresh air handling unit
Technical Field
The invention relates to the technical field of temperature and humidity control, in particular to a control method of a fresh air handling unit.
Background
With the progress and development of society, the requirements of people on life quality are continuously improved, and the requirements on air quality are increasingly brought into the field of view of people. The pollution of air, the epidemic of infectious virus, new trend receives the attention of everyone increasingly, and various fresh air handling units also increase, and the fresh air handling unit has heat recovery type, intensification type, temperature regulation type under the general circumstances, and when external fresh air temperature humidity changes, the air-out temperature of unit also changes along with the change, can't provide invariable fresh air humiture for indoor. Therefore, the control method of the fresh air unit is provided, and when the day and night environment changes gradually and the external weather natural condition changes, the fresh air unit can effectively ensure the constant temperature and humidity of the supplied air, and simultaneously ensure the stable operation of the compressor under the set working condition.
Disclosure of Invention
The invention aims to provide a control method of a fresh air handling unit aiming at the defects in the prior art.
In order to achieve the above object, the present invention provides a control method of a fresh air handling unit, the fresh air handling unit includes a precooler, an evaporator and an air-cooled condenser sequentially disposed in a fresh air handling channel, the air-cooled condenser is connected with an outlet of a compressor through the water-cooled condenser, and an expansion valve is connected between the air-cooled condenser and the evaporator, the evaporator is connected with an inlet of the compressor, the water-cooled condenser is connected with an external cooling water pump through a first water regulating valve, the precooler is connected with the external chilled water pump through a second water regulating valve, a blower is disposed in the fresh air handling channel, a fresh air temperature and humidity sensor is disposed in front of the precooler, a temperature sensor is disposed between the precooler and the evaporator, a blower temperature and humidity sensor is disposed in rear of the air-cooled condenser, and the blower, the first water regulating valve, the second water regulating valve and the compressor are all connected with a control device, the control method of the fresh air handling unit includes:
s1: setting an upper limit value and a lower limit value of the precooled temperature and the air supply temperature and humidity;
s2: the fresh air temperature and humidity sensor, the temperature sensor and the air supply temperature and humidity sensor send fresh air temperature and humidity information, precooled temperature information and air supply temperature and humidity information which are respectively acquired by the fresh air temperature and humidity sensor, the precooled temperature information and the air supply temperature and humidity sensor to the control device in real time;
s3: and the control device generates a power supply start-stop instruction according to the received fresh air temperature and humidity information, the precooled temperature information and the air supply temperature and humidity information, and combines the precooled temperature and the upper limit value and the lower limit value of the air supply temperature and humidity set in the step S1, and controls the operation of corresponding devices of the fresh air unit according to the power supply start-stop instruction.
Further, the step S3 specifically includes:
when the temperature and humidity of the external fresh air are higher than the set upper limit value of the temperature and humidity of the supplied air:
if the fresh air temperature is more than or equal to the set upper limit value of the pre-cooled temperature, the control device controls the second water regulating valve to be opened and controls the compressor to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve to be opened; if the fresh air temperature and humidity is less than or equal to the set lower limit value of the supply air temperature and humidity, the control device controls the second water regulating valve to be closed, and then controls the first water regulating valve and the compressor to be respectively closed and powered off;
if the fresh air temperature is less than the set lower limit value of the pre-cooled temperature, the control device controls the compressor to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve to be opened; when the fresh air temperature and humidity is less than or equal to the lower limit value of the set air supply temperature and humidity, the control device controls the first water regulating valve and the compressor to be respectively closed and powered off.
Further, the second water regulating valve comprises a proportional regulating valve, and the control device adjusts the opening of the second water regulating valve according to pre-cooling temperature information acquired by the temperature sensor in real time, specifically as follows:
if the pre-cooling temperature is more than the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve to increase the opening degree so as to increase the cold water flow; if the pre-cooling temperature is less than the set lower limit value of the pre-cooling temperature, the control device controls the second water regulating valve to reduce the opening degree so as to reduce the flow of cold water; and if the pre-cooling temperature is between the set lower limit value and the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve to maintain the opening degree unchanged so as to maintain the current cold water flow.
Further, the first water regulating valve comprises a proportional regulating valve, and the control device adjusts the opening of the first water regulating valve according to the air supply temperature and humidity information acquired by the air supply temperature and humidity sensor in real time, specifically as follows:
if the air supply temperature is more than the upper limit value of the set air supply temperature, the control device controls the first water regulating valve to increase the opening degree so as to increase the cold water flow; if the air supply temperature is less than the lower limit value of the set air supply temperature, the control device controls the first water regulating valve to adjust the opening degree to reduce the flow of cold water; and if the air supply temperature is between the set air supply temperature lower limit value and the set air supply temperature upper limit value, the control device controls the first water regulating valve to maintain the opening degree unchanged so as to maintain the cold water flow.
Further, the method further comprises the following steps:
and collecting fire signals of the fresh air unit, and sending the fire signals to a control device, wherein the control device controls the unit to stop completely after receiving the fire signals.
Further, the self-checking working condition of the control device comprises a ventilation control mode, a water-supply control mode and a compressor control mode, if the control device receives a fault signal transmitted by the fresh air unit in the running process of the fresh air unit, the control device controls corresponding devices of the fresh air unit to perform on-off running check, and the specific steps are as follows:
a: the control device controls the fresh air handling unit to stop for troubleshooting;
b: if the fault still exists after the fresh air unit is stopped, the control device starts a ventilation control mode and a water supply control mode, and if the ventilation control mode and the water supply control mode are operable, the fault of the compressor system is judged; if the ventilation control mode cannot operate and the water control mode can operate, judging that the blower fails; if the ventilation control mode is operable and the water control mode cannot be operated, judging that at least one of the first water regulating valve, the second water regulating valve, the external chilled water pump, the external cooling water pump and the water-cooled condenser is failed;
c: and the staff maintains the fault device checked by the control device.
The beneficial effects are that: the control logic preset by the control device is used for controlling the on-off time, the on-off sequence and the opening proportion of the valve element of each device of the fresh air handling unit, so that compared with the traditional method, the control logic of the fresh air handling unit is simpler and clearer, and the equipment stability is improved; and can guarantee that the compressor is operating under rated condition when external operating mode changes, guarantee the invariable of air supply humiture.
Drawings
FIG. 1 is a schematic diagram of a fresh air handling unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a fresh air handling unit according to an embodiment of the present invention.
Detailed Description
The invention will be further illustrated by the following drawings and specific examples, which are carried out on the basis of the technical solutions of the invention, it being understood that these examples are only intended to illustrate the invention and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a control method for a fresh air handling unit, where the fresh air handling unit includes a precooler 7, an evaporator 6 and an air-cooled condenser 4 sequentially disposed in a fresh air processing channel. The air-cooled condenser 4 is connected with an outlet of the compressor 1 through the water-cooled condenser 2, an expansion valve 5 is connected between the air-cooled condenser 4 and the evaporator 6, the evaporator 6 is connected with an inlet of the compressor 1, the water-cooled condenser 2 is connected with an external cooling water pump through the first water regulating valve 3, the precooler 7 is connected with the external chilled water pump through the second water regulating valve 8, and a blower is arranged in the fresh air treatment channel. The air blower introduces the external air into the fresh air treatment channel, the air is precooled by the precooler 7, cooled and dehumidified by the evaporator 6, heated by the condenser 4 and then sent out. A fresh air temperature and humidity sensor 9 is arranged on the front side of the precooler 7, a temperature sensor 10 is arranged between the precooler 7 and the evaporator 6, an air supply temperature and humidity sensor 11 is arranged on the rear side of the air-cooled condenser 4, the air feeder, the first water regulating valve 3, the second water regulating valve 8 and the compressor 1 are all connected with a control device, the work of the control device is controlled by the control device respectively, and the control method of the fresh air unit comprises the following steps:
s1: and setting an upper limit value and a lower limit value of the pre-cooled temperature and the air supply temperature and humidity.
S2: the fresh air temperature and humidity sensor 9, the temperature sensor 10 and the air supply temperature and humidity sensor 11 send fresh air temperature and humidity information, precooled temperature information and air supply temperature and humidity information which are respectively acquired by the fresh air temperature and humidity sensor to the control device in real time;
s3: and the control device generates a power supply start-stop instruction according to the received fresh air temperature and humidity information, the precooled temperature information and the air supply temperature and humidity information, and combines the precooled temperature and the upper limit value and the lower limit value of the air supply temperature and humidity set in the step S1, and controls the operation of corresponding devices of the fresh air unit according to the power supply start-stop instruction.
The step S3 specifically comprises the following steps:
when the temperature and humidity of the external fresh air are higher than the set upper limit value of the temperature and humidity of the supplied air:
if the fresh air temperature is more than or equal to the set upper limit value of the pre-cooled temperature, the control device controls the second water regulating valve 8 to be opened and controls the compressor 1 to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve 3 to be opened; if the fresh air temperature and humidity is less than or equal to the set lower limit value of the supply air temperature and humidity, the control device controls the second water regulating valve 8 to be closed, and then controls the first water regulating valve 3 and the compressor 1 to be closed and powered off respectively.
If the fresh air temperature is less than the set lower limit value of the pre-cooled temperature, the control device controls the compressor 1 to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve 3 to be opened; when the fresh air temperature and humidity is less than or equal to the lower limit value of the set air supply temperature and humidity, the control device controls the first water regulating valve 3 and the compressor 1 to be respectively closed and powered off.
The second water regulating valve 8 is preferably a proportional regulating valve, and can be matched with a two-way proportional regulating valve or a three-way proportional regulating valve according to the arrangement of a water system. The control device adjusts the opening of the second water regulating valve 8 according to the pre-cooling temperature information acquired by the temperature sensor 10 in real time, specifically as follows:
if the pre-cooling temperature is more than the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve 8 to increase the opening degree so as to increase the cold water flow; if the pre-cooling temperature is less than the set lower limit value of the pre-cooling temperature, the control device controls the second water regulating valve 8 to reduce the opening degree so as to reduce the flow of cold water; if the pre-cooling temperature is between the set lower limit value and the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve 8 to maintain the opening degree unchanged so as to maintain the current cold water flow.
The first water regulating valve 3 is also preferably a proportional regulating valve, and can be matched with a two-way proportional regulating valve or a three-way proportional regulating valve according to the arrangement of a water system. The control device adjusts the opening of the first water regulating valve 3 according to the air supply temperature and humidity information acquired by the air supply temperature and humidity sensor 11 in real time, and specifically comprises the following steps:
if the air supply temperature is greater than the upper limit value of the set air supply temperature, the control device controls the first water regulating valve 3 to increase the opening degree so as to increase the cold water flow; if the air supply temperature is less than the lower limit value of the set air supply temperature, the control device controls the first water regulating valve 3 to reduce the opening degree so as to reduce the flow of cold water; if the air supply temperature is between the set air supply temperature lower limit value and the air supply temperature upper limit value, the control device controls the first water regulating valve 3 to maintain the opening degree unchanged so as to maintain the cold water flow rate.
The embodiment of the invention also comprises the steps of collecting fire signals of the fresh air unit and sending the fire signals to the control device, wherein the control device controls the unit to stop completely after receiving the fire signals in the running process of the fresh air unit. The fire signal may be collected by, for example, a smoke sensing probe or a flame probe.
The self-checking working condition of the control device comprises a ventilation control mode, a water supply control mode and a compressor control mode, wherein the operation of the air blower is controlled in the ventilation control mode. In the water-through control mode, the first water regulating valve 3, the external cooling water pump, the second water regulating valve 8, the external chilled water pump and the like are controlled to operate. The compressor system is controlled to operate in a compressor control mode, i.e., based on operation in a ventilation control mode and a water control mode. If the control device receives a fault signal transmitted by the fresh air unit in the running process of the fresh air unit, the control device controls corresponding devices of the fresh air unit to perform on-off running check, and the specific steps are as follows:
a: the control device controls the fresh air handling unit to stop for troubleshooting;
b: if the fault still exists after the fresh air unit is stopped, the control device starts a ventilation control mode and a water supply control mode, and if the ventilation control mode and the water supply control mode can operate, the fault of the compressor system is judged; if the ventilation control mode cannot operate and the water control mode can operate, judging that the blower fails; if the ventilation control mode is operable and the water supply control mode is not operable, it is determined that at least one of the first water regulating valve 3, the second water regulating valve 8, the external chilled water pump, the external cooling water pump, and the water-cooled condenser 2 has failed.
C: and the staff maintains the fault device checked by the control device. And returning to the step S1 after the fault is relieved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to a person of ordinary skill in the art. Modifications and alterations may be made without departing from the principles of this invention, and such modifications and alterations should also be considered as being within the scope of the invention.

Claims (5)

1. The control method of the fresh air unit comprises a precooler, an evaporator and an air-cooled condenser which are sequentially arranged in a fresh air processing channel, wherein the air-cooled condenser is connected with an outlet of a compressor through a water-cooled condenser, an expansion valve is connected between the air-cooled condenser and the evaporator, the evaporator is connected with an inlet of the compressor, the water-cooled condenser is connected with an external cooling water pump through a first water regulating valve, the precooler is connected with the external chilled water pump through a second water regulating valve, and a blower is arranged in the fresh air processing channel.
S1: setting an upper limit value and a lower limit value of the precooled temperature and the air supply temperature and humidity;
s2: the fresh air temperature and humidity sensor, the temperature sensor and the air supply temperature and humidity sensor send fresh air temperature and humidity information, precooled temperature information and air supply temperature and humidity information which are respectively acquired by the fresh air temperature and humidity sensor, the precooled temperature information and the air supply temperature and humidity sensor to the control device in real time;
s3: the control device generates a power supply start-stop instruction according to the received fresh air temperature and humidity information, pre-cooling temperature information and air supply temperature and humidity information, and combines the pre-cooling temperature and the upper limit value and the lower limit value of the air supply temperature and humidity set in the step S1, and controls the operation of a device corresponding to the fresh air unit according to the power supply start-stop instruction;
the step S3 specifically includes:
when the temperature and humidity of the external fresh air are higher than the set upper limit value of the temperature and humidity of the supplied air:
if the fresh air temperature is greater than or equal to the set upper limit value of the pre-cooled temperature, executing the step S31, and if the fresh air temperature is less than the set lower limit value of the pre-cooled temperature, executing the step S32;
step S31, the control device controls the second water regulating valve to be opened and controls the compressor to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve to be opened; if the fresh air temperature and humidity is less than or equal to the set lower limit value of the supply air temperature and humidity, the control device controls the second water regulating valve to be closed, and then controls the first water regulating valve and the compressor to be respectively closed and powered off;
step S32, the control device controls the compressor to be powered on; if the air supply temperature is more than or equal to the upper limit value of the set air supply temperature, the control device delays for a set time and then controls the first water regulating valve to be opened; when the fresh air temperature and humidity is less than or equal to the lower limit value of the set air supply temperature and humidity, the control device controls the first water regulating valve and the compressor to be respectively closed and powered off.
2. The control method of a fresh air handling unit according to claim 1, wherein the second water regulating valve comprises a proportional regulating valve, and the control device adjusts the opening of the second water regulating valve according to pre-cooling temperature information acquired by a temperature sensor in real time, specifically as follows:
if the pre-cooling temperature is more than the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve to increase the opening degree so as to increase the cold water flow; if the pre-cooling temperature is less than the set lower limit value of the pre-cooling temperature, the control device controls the second water regulating valve to reduce the opening degree so as to reduce the flow of cold water; and if the pre-cooling temperature is between the set lower limit value and the set upper limit value of the pre-cooling temperature, the control device controls the second water regulating valve to maintain the opening degree unchanged so as to maintain the current cold water flow.
3. The control method of a fresh air handling unit according to claim 1, wherein the first water regulating valve comprises a proportional regulating valve, and the control device adjusts the opening of the first water regulating valve according to the air supply temperature and humidity information collected in real time by an air supply temperature and humidity sensor, specifically as follows:
if the air supply temperature is more than the upper limit value of the set air supply temperature, the control device controls the first water regulating valve to increase the opening degree so as to increase the cold water flow; if the air supply temperature is less than the lower limit value of the set air supply temperature, the control device controls the first water regulating valve to adjust the opening degree to reduce the flow of cold water; and if the air supply temperature is between the set air supply temperature lower limit value and the set air supply temperature upper limit value, the control device controls the first water regulating valve to maintain the opening degree unchanged so as to maintain the cold water flow.
4. The method for controlling a fresh air handling unit according to claim 1, further comprising:
and collecting fire signals of the fresh air unit, and sending the fire signals to a control device, wherein the control device controls the unit to stop completely after receiving the fire signals.
5. The method for controlling a fresh air handling unit according to claim 1, wherein the self-checking conditions of the control device include a ventilation control mode, a water-supply control mode and a compressor control mode, and if the control device receives a fault signal from the fresh air handling unit during operation of the fresh air handling unit, the control device controls corresponding devices of the fresh air handling unit to perform on-off operation check, which comprises the following specific steps:
a: the control device controls the fresh air handling unit to stop for troubleshooting;
b: the control device starts a ventilation control mode and a water-through control mode if the faults still exist after the fresh air unit is stopped, and judges that the compressor system is faulty if the ventilation control mode and the water-through control mode are operable; if the ventilation control mode cannot operate and the water control mode can operate, judging that the blower fails; if the ventilation control mode is operable and the water control mode cannot be operated, judging that at least one of the first water regulating valve, the second water regulating valve, the external chilled water pump, the external cooling water pump and the water-cooled condenser is failed;
c: and the staff maintains the fault device checked by the control device.
CN202111098407.9A 2021-09-18 2021-09-18 Control method of fresh air handling unit Active CN114135962B (en)

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CN202392910U (en) * 2011-12-21 2012-08-22 南京五洲制冷集团有限公司 Double-cold-source all fresh air dehumidifier
CN103411278A (en) * 2013-08-23 2013-11-27 机械工业第三设计研究院 Fresh air handling unit suitable for air conditioning system allowing independent temperature and humidity control
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CN111397141B (en) * 2020-04-15 2021-10-22 江苏高科应用科学研究所有限公司 Dehumidifier control method
CN112178778B (en) * 2020-09-30 2021-05-14 南京慧和建筑技术有限公司 Anti-condensation method for air conditioner radiation tail end and multi-house space radiation tail end

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