CN112594901A - Active chilled beam air conditioner terminal control system based on PLC - Google Patents

Active chilled beam air conditioner terminal control system based on PLC Download PDF

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Publication number
CN112594901A
CN112594901A CN202011603808.0A CN202011603808A CN112594901A CN 112594901 A CN112594901 A CN 112594901A CN 202011603808 A CN202011603808 A CN 202011603808A CN 112594901 A CN112594901 A CN 112594901A
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temperature
water
chilled
fresh air
active
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Inventor
邱剑涛
戴源德
涂文锋
李鸣
张诺晨
朱珊云
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Nanchang University
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Nanchang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller), which is characterized in that a CPU (central processing unit), a digital input/output (DI/DO) module and an analog input/output (AI/AO) module of the PLC are connected with a freezing water pump, a fresh air fan, a frequency converter, an electric water valve, a fresh air valve, a temperature and humidity sensor and the like, and a human-computer interface is matched to realize the purpose of terminal control. The invention relates to an active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller), which is characterized in that high-temperature and low-temperature water chilling units are respectively arranged to operate in a matched mode to meet the requirements of indoor sensible heat and latent heat loads, the number of operating active chilled beams, a fresh air fan, a fresh air unit and the operating frequency of a chilled water pump can be adjusted according to the actual load, and the purpose of saving the energy consumption of an air conditioning system is achieved. In addition, the control system is matched with system emergency starting and stopping measures such as anti-condensation alarm, equipment fault alarm and the like so as to ensure the safety and indoor health of the cold beam air conditioner during operation.

Description

Active chilled beam air conditioner terminal control system based on PLC
Technical Field
The invention relates to the technical field of energy conservation of building ventilation air conditioners, in particular to an active chilled beam air conditioner tail end control system based on a Programmable Logic Controller (PLC).
Background
Currently, the relation between the requirement of people on the comfort of indoor living environment and the energy consumption of building ventilation and air conditioning has attracted extensive social attention. This is embodied in: on one hand, the global indoor refrigeration demand is continuously increasing, and on the other hand, the development of the building ventilation air conditioner is in line with the current relevant policies of energy conservation and environmental protection. As more than half of the existing buildings are expected to remain for decades, the task of applying emerging hvac technology to new roofed buildings or energy efficient retrofit of old buildings is pressing.
The active cold beam is used as a new building ventilation air-conditioning technology, and the indoor sensible heat load and the indoor latent heat load are processed separately, so that the active cold beam is one of independent temperature and humidity control systems. The fresh air on the primary side is used for inducing indoor air to exchange heat with the cold beam coil, the capacity of the tail end of the cold beam for processing latent cold load is fully exerted, the operating efficiency of an air conditioning system is improved, and the building energy consumption is saved in long-term operation. In addition, the good indoor airflow organization form also brings good thermal comfort to human body. However, in consideration of the influence of dew condensation on the chilled beam coil on the indoor environmental sanitation and the increase of pressure loss of the induction nozzle of the active chilled beam on the wind pressure requirement of primary fresh air, the engineering application experience of the active chilled beam air conditioning system in China is still small, and the cold supply method mainly focuses on the cold supply by mixing low-temperature chilled water and normal-temperature water (water mixing method). The water mixing method is only suitable for the situation that only a few rooms are needed in a building for cold beam cooling, and the requirement on comfort level is high, namely, the building rooms needing large-area active cold beam air conditioners need to be met by adopting a mode of separately arranging high and low temperature water chilling units.
The operation of the active chilled beam air conditioning system meets the requirement of comfort of indoor personnel on one hand, and on the other hand, the unit equipment is guaranteed to operate at high efficiency, so that mechanical abrasion and equipment faults caused by frequent starting and stopping of a plurality of pieces of equipment at power frequency are avoided. In addition, in order to effectively control the indoor sanitation problem caused by the condensation of the cold beam coil, an anti-condensation control strategy needs to be set.
In summary, design optimization of the current active chilled beam end control system is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller), aiming at the problem of operation of the chilled beam air conditioner, wherein high-temperature and low-temperature water chilling units are respectively arranged to operate in a matched manner so as to meet the indoor sensible heat and latent heat load requirements, and the number of the operating chilled beams, the fresh air fan, the primary side low-temperature chilled water pump and the secondary side high-temperature chilled water pump can be adjusted according to the actual load, so that the aim of saving the energy consumption of the air conditioning system is fulfilled.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller) comprises an air conditioning device, a temperature control module, a humidity control module, a fresh air unit and an active chilled beam, wherein the fresh air unit comprises a fresh air unit coil and a fresh air fan;
the temperature control module comprises a low-temperature water chilling unit, a primary side low-temperature chilled water pump, a low-temperature chilled water plate type heat exchanger and a secondary side low-temperature chilled water pump, wherein a water inlet and a water outlet are respectively formed in two sides of the low-temperature chilled water plate type heat exchanger;
the humidity control module comprises a high-temperature water chilling unit, a primary side high-temperature chilled water pump, a high-temperature chilled water plate type heat exchanger and a secondary side high-temperature chilled water pump, wherein a water inlet and a water outlet are respectively formed in two sides of the high-temperature chilled water plate type heat exchanger, one side of the high-temperature chilled water plate type heat exchanger is connected with the high-temperature water chilling unit and the primary side high-temperature chilled water pump through a high-temperature chilled water circulation pipeline, and the other side of the high-temperature chilled water plate type heat exchanger is connected with the secondary side.
An active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller) comprises an air conditioning device and a plate heat exchanger for water mixing heat exchange, wherein a water inlet and a water outlet are respectively arranged on two sides of the plate heat exchanger for water mixing heat exchange; one side of the plate heat exchanger for water mixing heat exchange is communicated with the low-temperature chilled water circulation pipeline through a water mixing circulation pipeline, and the other side of the plate heat exchanger is communicated with the high-temperature chilled water circulation pipeline through a water mixing circulation pipeline.
One end of the air supply pipeline is connected with a fresh air fan, the other end of the air supply pipeline is connected with a plurality of active cold beams, and the fresh air fan and the active cold beams are provided with electric fresh air valves.
And a fifth electric water valve, a sixth electric water valve and a total electric water valve are arranged on the high-temperature chilled water circulating pipeline, and branch electric water valves are arranged between the high-temperature chilled water circulating pipeline and each active chilled beam.
A first electric water valve and a second electric water valve are arranged between the mixed water circulation pipeline and the low-temperature chilled water circulation pipeline, and a third electric water valve and a fourth electric water valve are arranged between the mixed water circulation pipeline and the high-temperature chilled water circulation pipeline.
A kind of active chilled beam air conditioner terminal control system based on PLC, its control equipment composition includes CPU, digital quantity input/output module DI/DO, analog quantity input/output module AI/AO, sensor and frequency converter of the PLC controller, the CPU of the said PLC controller is electrically connected with digital quantity input/output module DI/DO, analog quantity input/output module AI/AO, the said digital quantity input/output module DI/DO and analog quantity input/output module AI/AO are electrically connected with frozen water pump, blower, electric water valve, fresh air valve, sensor and frequency converter; the specific model of the PLC controller is Mitsubishi FX3UCPU of 64MR, model FX2NAD Module of-8 AD and model FX3U-4DA modules, said sensors comprising chilled beam coil surface temperature sensors, room humidity sensors.
The frequency converter is connected with a fresh air fan in the fresh air unit, and the operating frequency of the fresh air fan is adjusted through the frequency converter.
The invention has the beneficial effects that:
(1) the invention can adjust the number of the active chilled beams and the operating frequency of the fresh air fan and the chilled water pump according to the actual load by arranging the high-temperature and low-temperature water chilling units to operate in a matching way so as to meet the requirements of sensible heat and latent heat loads in a room, thereby achieving the purpose of saving the energy consumption of an air conditioning system;
(2) the tail end control system is also matched with system emergency starting and stopping measures such as anti-condensation alarm, equipment fault alarm and the like so as to ensure the safety and indoor health of the cold beam air conditioner during operation.
Drawings
FIG. 1 is a schematic view of an active chilled beam air conditioning system according to the present invention;
FIG. 2 is a schematic diagram of the equipment connections for the active chilled beam air conditioner end control system of the present invention;
FIG. 3 is a schematic diagram of the operation of the active chilled beam air conditioner of the present invention under normal operating conditions;
FIG. 4 is a working schematic diagram of the active chilled beam air conditioner high temperature chiller unit of the present invention in failure;
in the figure: 1. a low temperature chiller; 2. a high temperature water chilling unit; 3. a fresh air handling unit; 4. a coil pipe of the fresh air handling unit; 5. a fresh air fan; 6. a first active chilled beam; 7. a second active chilled beam; 8. a third active chilled beam; 9. a fourth active chilled beam; 10. a first chilled beam coil surface temperature sensor; 11. a second chilled beam coil surface temperature sensor; 12. a third chilled beam coil surface temperature sensor; 13. a fourth chilled beam coil surface temperature sensor; 14. a first electric fresh air valve; 15. a second electric fresh air valve; 16. a third electric fresh air valve; 17. a fourth electric fresh air valve; 18. a first branch electric water valve; 19. a second branch electric water valve; 20. a third branch electric water valve; 21. a fourth branch electric water valve; 22. a total electric water valve; 23. a first electrically operated water valve; 24. a second electrically operated water valve; 25. a third electrically operated water valve; 26. a fourth electrically operated water valve; 27. a fifth electrically operated water valve; 28. a sixth electrically operated water valve; 29. a primary side low-temperature chilled water pump; 30. a primary side high temperature chilled water pump; 31. a secondary side low-temperature chilled water pump 32 and a secondary side high-temperature chilled water pump; 33. a low-temperature chilled water plate heat exchanger; 34. a high-temperature chilled water plate heat exchanger; 35. a plate heat exchanger for water mixing heat exchange; 36. a room temperature sensor; 37. a room humidity sensor; 38. refrigerating a room; 39. a first frequency converter; 40. and a second frequency converter.
Detailed Description
In order to better explain the present invention, the detailed description of the present invention is made below with reference to the accompanying drawings and examples.
Example (b): see fig. 1-4.
As shown in fig. 1, an active chilled beam air conditioner terminal control system based on a PLC includes a temperature control module, a humidity control module, a fresh air handling unit 3 and an active chilled beam, wherein the fresh air handling unit 3 includes a fresh air handling unit coil 4 and a fresh air blower 5, the temperature control module is connected with a plurality of active chilled beams through the fresh air handling unit 3 and an air supply pipeline, and the humidity control module is connected with the plurality of active chilled beams through a high-temperature chilled water circulation pipeline;
the temperature control module comprises a low-temperature water chilling unit 1, a primary side low-temperature chilled water pump 29, a low-temperature chilled water plate type heat exchanger 33 and a secondary side low-temperature chilled water pump 31, wherein a water inlet and a water outlet are respectively formed in two sides of the low-temperature chilled water plate type heat exchanger 33, one side of the low-temperature chilled water plate type heat exchanger 33 is connected with the low-temperature water chilling unit 1 and the primary side low-temperature chilled water pump 29 through a low-temperature chilled water circulation pipeline, and the other side of the low-temperature chilled water plate type heat exchanger 33 is connected with the secondary side;
the humidity control module comprises a high-temperature water chilling unit 2, a primary side high-temperature chilled water pump 30, a high-temperature chilled water plate type heat exchanger 34 and a secondary side high-temperature chilled water pump 32, wherein a water inlet and a water outlet are respectively formed in two sides of the high-temperature chilled water plate type heat exchanger 34, one side of the high-temperature chilled water plate type heat exchanger 34 is connected with the high-temperature water chilling unit 2 and the primary side high-temperature chilled water pump 30 through a high-temperature chilled water circulation pipeline, and the other side of the high-temperature chilled water plate type heat exchanger is connected with the secondary side high.
An active chilled beam air conditioner terminal control system based on a PLC (programmable logic controller) further comprises a plate heat exchanger 35 for water mixing heat exchange, wherein a water inlet and a water outlet are respectively arranged on two sides of the plate heat exchanger 35 for water mixing heat exchange; one side of the plate heat exchanger 35 for water mixing and heat exchange is communicated with the low-temperature chilled water circulation pipeline through a water mixing circulation pipeline, and the other side of the plate heat exchanger is communicated with the high-temperature chilled water circulation pipeline through a water mixing circulation pipeline.
The utility model provides an active chilled beam air conditioner end control system based on PLC, its operating system principle as follows:
under the normal operation condition, the low-temperature water chilling unit 1 generates low-temperature chilled water, the primary side low-temperature chilled water and the secondary side low-temperature chilled water inlet and outlet water temperatures (7/12 ℃) are respectively subjected to heat exchange through the primary side low-temperature chilled water pump 29 and the secondary side low-temperature chilled water pump 31, and the secondary side chilled water is conveyed into a fresh air unit coil 4 of the fresh air unit 3 through the secondary side low-temperature chilled water pump 31;
the high-temperature water chilling unit 2 generates high-temperature chilled water, the primary side high-temperature chilled water and the secondary side high-temperature chilled water inlet and outlet water temperatures (16/19 ℃) are respectively subjected to heat exchange through the primary side high-temperature chilled water pump 30 and the secondary side high-temperature chilled water pump 32, and the secondary side chilled water is respectively conveyed to cooling coils of a first active chilled beam 6, a second active chilled beam 7, a third active chilled beam 8 and a fourth active chilled beam 9 through the secondary side high-temperature chilled water pump 32;
after being cooled by the coil 4 of the fresh air unit, primary air (fresh air) is respectively sent to the first active chilled beam 6, the second active chilled beam 7, the third active chilled beam 8 and the fourth active chilled beam 9 through the fresh air fan 5, negative pressure is formed in a mixing cavity of the active chilled beams after being sprayed out through a nozzle, after secondary air in the room 38 is induced to exchange heat with the coil in the active chilled beams, the primary air and the secondary air are mixed in the mixing cavity of the active chilled beams, and then the primary air and the secondary air are sent into the room 38 from an air outlet of the active chilled beams.
The front ends of the cooling coils of the first active chilled beam 6, the second active chilled beam 7, the third active chilled beam 8 and the fourth active chilled beam 9 are respectively provided with a total electric water valve 22, a first branch electric water valve 18, a first branch electric water valve 19, a first branch electric water valve 20 and a first branch electric water valve 21 which are respectively used for the total on-off and the branch on-off of the high-temperature chilled water.
And a first electric fresh air valve 14, a second electric fresh air valve 15, a third electric fresh air valve 16 and a first electric fresh air valve 17 are respectively arranged between the fresh air handling unit 3 and the first active chilled beam 6, the second active chilled beam 7, the third active chilled beam 8 and the fourth active chilled beam 9 and are respectively used for switching on and off fresh air of each branch.
The first electric water valve 23, the second electric water valve 24, the third electric water valve 25, the fourth electric water valve 26, the fifth electric water valve 27 and the sixth electric water valve 28 are valves for switching the water paths when the high-temperature water chilling unit 2 fails; when the high-temperature water chilling unit 2 normally operates, the first electric water valve 23, the second electric water valve 24, the fourth electric water valve 25 and the sixth electric water valve 28 are closed, and the third electric water valve 26 and the fifth electric water valve 27 are opened; when the high-temperature water chilling unit 2 breaks down, the low-temperature water chilling unit 1 runs independently and shares a part of chilled water and normal-temperature water to be mixed at the same time, high-temperature chilled water of the first active chilled beam 6, the second active chilled beam 7, the third active chilled beam 8 and the fourth active chilled beam 9 is provided, at the moment, the first electric water valve 23, the second electric water valve 24, the fourth electric water valve 25 and the sixth electric water valve 28 are opened, and the third electric water valve 26 and the fifth electric water valve 27 are closed.
As shown in fig. 2, a PLC-based active chilled beam air conditioner terminal control system, the control device thereof comprises a CPU of a PLC, a digital input/output module DI/DO, an analog input/output module AI/AO, a sensor and a frequency converter, the CPU of the PLC is electrically connected with the digital input/output module DI/DO and the analog input/output module AI/AO, and the digital input/output module DI/DO and the analog input/output module AI/AO are electrically connected with a chilled water pump, a fan, an electric water valve, a fresh air valve, a sensor and the frequency converter;
the control equipment composition specifically comprises a Mitsubishi FX model3UCPU of 64MR, model FX2NAD Module of-8 AD and model FX3U4DA, said sensors including chilled beam coil surface temperature sensor, room temperature sensor 36, room humidity sensor 37.
With the PLC controller FX3U-64MR as a reference, the digital quantity input module DI comprising: the system comprises a main power supply start-stop X0, a first active chilled beam 6, a second active chilled beam 7, a third active chilled beam 8 and a fourth active chilled beam 9 (X1-X4), a fault signal X5 of a fresh air fan 5, a fault signal X6 of a secondary low-temperature chilled water pump 31, a fault signal X7 of the secondary high-temperature chilled water pump 32, a fault signal X10 of a second frequency converter 40 of the fresh air fan 5, a fault signal X11 of a first frequency converter 39 of the secondary high-temperature chilled water pump 32 and a fault signal X12 of the high-temperature water chilling unit 2.
FX with the PLC controller3UWith reference to 64MR, the digital output module DO comprises: the first electric fresh air valve 14 signal Y0, the second electric fresh air valve 15 signal Y1, the third electric fresh air valve 16 signal Y2 and the fourth electric fresh air valve 17 signal Y3; the signal Y4 of the first branch electric water valve 18, the signal Y5 of the second branch electric water valve 19, the signal Y6 of the third branch electric water valve 20 and the signal Y6 of the fourth branch electric water valveWater valve 21 signal Y7; total electronic water valve 22 signal Y10, first electronic water valve 23 signal Y23, the electronic water valve 24 signal Y24 of second, the electronic water valve 25 signal Y25 of third, the electronic water valve 26 signal Y26 of fourth, the electronic water valve 27 signal Y27 of fifth, the electronic water valve 28 signal Y28 of sixth, the operation terminal signal (Y12 ~ Y17) of the second converter 40 of new air fan 5 the first converter 39 operation terminal signal (Y21 ~ Y22) of secondary side high temperature chilled water pump 32, the operation signal Y11 and the dew condensation warning indicator Y20 of secondary side low temperature chilled water pump 31.
Analog quantity input module FX of PLC controller2N-8AD as a reference, the analog input module AI comprising: the room 38 has an indoor dry bulb temperature CH1, an indoor relative humidity CH2, and a surface temperature of the 4 active chilled beam coils used in the example (CH 3-CH 6).
Analog quantity output module FX of PLC controller3U-4DA as a reference, the analog output module AO comprising: and an operation terminal of a first frequency converter 39 of the secondary side high temperature chilled water pump 32.
In summary, an active chilled beam air conditioner end control system based on PLC has the following specific control flow: pressing a main power button, and then pressing and confirming the corresponding active cold beam starting button; when the air conditioner is just started, the control system preferentially starts the fresh air fan 5 and opens the corresponding fresh air valve, and the frequencies of the second frequency converters 40 of the initial fresh air fan 5 corresponding to the number of the active cold beams are 50Hz (4), 45Hz (3), 40Hz (2) and 35Hz (1) in sequence when the air conditioner is initially started. At the same time, the PLC controller FX3UThe method comprises the steps that an internal timer of a 64MR starts timing, after 2 minutes of timing, when the fact that the indoor dew point temperature is lower than 16.7 ℃ or the timer runs for 5 minutes is detected, a branch electric water valve, a total electric water valve and a secondary side high-temperature chilled water pump 32 are sequentially started, after the secondary side high-temperature chilled water pump 32 is started, the frequency of an initial frequency converter corresponding to a frequency converter of a fresh air fan 5 is adjusted to be 40Hz (4), 36Hz (3), 32Hz (2) and 28Hz (1), and then multi-stage speed adjustment is carried out according to the interval range of indoor relative humidity;
secondary side high temperature chilled water pump 32 variantThe frequency of the frequency device is determined by two parameters of the number of the initially opened active cold beams and the indoor dry bulb temperature, the frequency is initially determined to be 40Hz (4 sets), 36Hz (3 sets), 32Hz (2 sets) and 28Hz (1 set) according to the number of the initially opened active cold beams, and after the frequency device is opened for three minutes, PID adjustment is carried out according to the difference value of the indoor dry bulb temperature and the set temperature. Combining the requirement of condensation prevention of the cold beam coil pipe, on the premise that the relative humidity is below 50%, according to the indoor dry bulb temperature tgAnd relative humidity
Figure BDA0002869967080000071
Calculating the dew point temperature tdAnd reading the temperature t of the surface of each cold beam coilwWhen t isd+1.2≤tw≤tdWhen +1.5 hours, the stand horse adjusts the frequency of the secondary side high-temperature chilled water pump 32 to 10Hz, and closes each electric water valve and the total electric water valve 22 until tw＞tdWhen the temperature is +1.5, the operation frequency of the secondary side high-temperature chilled water pump 32 is adjusted through PID according to the difference between the dry-bulb temperature value and the set value; when t isw≤tdAnd +1.2, immediately closing the secondary side high-temperature chilled water pump 32 and each electric water valve.
A PLC-based active chilled beam air conditioner tail end control system comprises the following processing methods for the operation fault of an air conditioner system:
when the secondary side low-temperature chilled water pump 31 fails, the secondary side low-temperature chilled water pump 31 is firstly closed, then the secondary side high-temperature chilled water pump 32 and each branch electric water valve are closed, and finally the fresh air fan and each branch electric fresh air valve are closed after 1 minute delay;
when the secondary side high-temperature chilled water pump 32 fails, the secondary side high-temperature chilled water pump 32 is firstly closed, then the branch electric water valves and the secondary side low-temperature chilled water pump 31 are closed, and finally the fresh air fan 5 and the branch electric fresh air valves are closed (delayed for 1 minute);
when the fresh air fan 5 fails, the fresh air fan 5 is firstly closed, then the secondary side low-temperature chilled water pump 31, the electric fresh air valves and the secondary side high-temperature chilled water pump 32 are closed, and finally the branch electric water valves are closed;
when the second frequency converter 40 of the fresh air fan 5 fails, firstly closing all output signals related to the second frequency converter 40 of the fresh air fan 5, and then closing the fresh air fan, the chilled water pump, the fresh air valve, the chilled water pump and the chilled water valve in sequence;
when the frequency converter of the freezing water pump fails, all signals related to the frequency converter of the secondary side high-temperature freezing water pump 32 are closed, and then the signals are closed according to the sequence of the freezing water valve, the fresh air unit (delaying for 1 minute) and the fresh air valve (delaying for 1 minute).
When a user presses a stop button of a single active chilled beam in the operation process, the control system firstly lowers the frequency converter of the fresh air handling unit 5 and the first frequency converter 39 of the secondary side high-temperature chilled water pump 32 to corresponding frequencies, and then closes the frequency converters according to the sequence of the corresponding branch electric water valves and the corresponding electric fresh air valves;
when a main power supply stop button is pressed, the control system firstly stops the secondary side high-temperature chilled water pump 32 (namely, the forward rotation signal output of the frequency converter is canceled), and then closes the branch electric water valves, the secondary side low-temperature chilled water pump 31 (namely, the forward rotation signal output of the frequency converter is canceled), the fresh air fan 5 (delaying for 1 minute) and the electric fresh air valves (delaying for 1 minute) in sequence.
In the above operation process, the reason why the fresh air fan 5 needs to be started to reduce the indoor dry bulb temperature and the relative humidity and then the secondary side high-temperature chilled water pump 32 is started is as follows: firstly, primary fresh air is fully utilized to remove partial indoor latent heat, the dew point temperature of indoor air is reduced by reducing the indoor dry bulb temperature and relative humidity, so that the surface temperature of a cold beam coil pipe is higher than the dew point temperature of the indoor air when a secondary side high-temperature chilled water pump is started again, and the dew point temperature is calculated through the dry bulb temperature and the relative humidity according to the following empirical formula
Figure BDA0002869967080000081
Wherein t is the dry bulb temperature, in units,
Figure BDA0002869967080000082
is the relative humidity. The empirical formula (1) is used as a subprogram to be embedded into the PLC, and the anti-condensation control program is written in a calling mode, so that the start and stop of the equipment are controlled to ensure the indoor sanitation and health.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent transformations made by the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. The utility model provides an active chilled beam air conditioner end control system based on PLC, its air conditioning equipment constitutes including temperature control module, humidity control module, fresh air handling unit (3) and active chilled beam, its characterized in that:
the fresh air unit (3) comprises a fresh air unit coil (4) and a fresh air fan (5), the temperature control module is connected with the plurality of active chilled beams through the fresh air unit (3) and an air supply pipeline, and the humidity control module is connected with the plurality of active chilled beams through a high-temperature chilled water circulating pipeline;
the temperature control module comprises a low-temperature water chilling unit (1), a primary side low-temperature chilled water pump (29), a low-temperature chilled water plate type heat exchanger (33) and a secondary side low-temperature chilled water pump (31), wherein a water inlet and a water outlet are respectively formed in two sides of the low-temperature chilled water plate type heat exchanger (33), one side of the low-temperature chilled water plate type heat exchanger (33) is connected with the low-temperature water chilling unit (1) and the primary side low-temperature chilled water pump (29) through a low-temperature chilled water circulation pipeline, and the other side of the low-temperature chilled water plate type heat exchanger is connected with the secondary side low-temperature chilled water pump (31; the humidity control module comprises a high-temperature water chilling unit (2), a primary side high-temperature chilled water pump (30), a high-temperature chilled water plate type heat exchanger (34) and a secondary side high-temperature chilled water pump (32), wherein a water inlet and a water outlet are respectively formed in two sides of the high-temperature chilled water plate type heat exchanger (34), one side of the high-temperature chilled water plate type heat exchanger (34) is connected with the high-temperature water chilling unit (2) and the primary side high-temperature chilled water pump (30) through a high-temperature chilled water circulation pipeline, and the other side of the high-temperature chilled water plate type heat exchanger is connected with the secondary side high-temperature chilled.
2. The active chilled beam air conditioner terminal control system based on the PLC according to claim 1, wherein the air conditioning equipment further comprises a plate heat exchanger (35) for mixed water heat exchange, and both sides of the plate heat exchanger (35) for mixed water heat exchange are respectively provided with a water inlet and a water outlet; one side of the plate type heat exchanger (35) for water mixing and heat exchange is communicated with the low-temperature chilled water circulation pipeline through a water mixing circulation pipeline, and the other side of the plate type heat exchanger is communicated with the high-temperature chilled water circulation pipeline through a water mixing circulation pipeline.
3. The active chilled beam air conditioner end control system based on PLC of claim 1, characterized in that the air supply pipeline of the air conditioner is connected with a fresh air fan (5) at one end and connected with a plurality of active chilled beams at the other end, and the fresh air fan (5) and the active chilled beams are provided with electric fresh air valves.
4. The active chilled water beam air conditioner terminal control system based on PLC of claim 1, characterized in that a high temperature chilled water circulation pipeline in the air conditioning equipment assembly is provided with a fifth electric water valve (27), a sixth electric water valve (28) and a total electric water valve (22), and a branch electric water valve is arranged between the high temperature chilled water circulation pipeline and each active chilled beam.
5. The air conditioning equipment assembly of the active chilled beam air conditioner end control system based on the PLC according to claim 1, wherein a first electric water valve (23) and a second electric water valve (24) are arranged between the water mixing circulation pipeline and the low-temperature chilled water circulation pipeline, and a third electric water valve (25) and a fourth electric water valve (26) are arranged between the water mixing circulation pipeline and the high-temperature chilled water circulation pipeline.
6. The active chilled beam air conditioner terminal control system based on PLC of claim 1, wherein the control equipment comprises a CPU of the PLC, a digital input/output module DI/DO, an analog input/output module AI/AO, a sensor and a frequency converter, and is characterized in that the CPU of the PLC is electrically connected with the digital input/output module DI/DO and the analog input/output module AI/AO, and the digital input/output module DI/DO and the analog input/output module AI/AO are connected with a chilled water pump, a fan, an electric water valve, a fresh air valve, a sensor and the frequency converter; the PLC controller comprises a Mitsubishi FX model3UCPU of 64MR, model FX2NAD Module of-8 AD and model FX3U-4DA modules, said sensors comprising chilled beam coil surface temperature sensors, room temperature sensors (36), room humidity sensors (37).
7. The active chilled beam air conditioner end control system based on PLC of claim 1, characterized in that, the frequency converter is connected with a fresh air fan (5) in a fresh air unit (3), and the operating frequency of the fresh air fan (5) is adjusted by the frequency converter.
CN202011603808.0A 2020-12-29 2020-12-29 Active chilled beam air conditioner terminal control system based on PLC Pending CN112594901A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117704540A (en) * 2024-02-04 2024-03-15 无锡菲兰爱尔空气质量技术有限公司 Radiation end system control device matched with chilled beam and method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117704540A (en) * 2024-02-04 2024-03-15 无锡菲兰爱尔空气质量技术有限公司 Radiation end system control device matched with chilled beam and method thereof
CN117704540B (en) * 2024-02-04 2024-05-24 无锡菲兰爱尔空气质量技术有限公司 Radiation end system control device matched with chilled beam and method thereof

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