CN114992729A - Direct expansion air conditioning system suitable for subway station and control method thereof - Google Patents
Direct expansion air conditioning system suitable for subway station and control method thereof Download PDFInfo
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- CN114992729A CN114992729A CN202110222772.XA CN202110222772A CN114992729A CN 114992729 A CN114992729 A CN 114992729A CN 202110222772 A CN202110222772 A CN 202110222772A CN 114992729 A CN114992729 A CN 114992729A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 16
- 239000011737 fluorine Substances 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims description 29
- 239000000725 suspension Substances 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005457 optimization Methods 0.000 claims description 12
- 238000011217 control strategy Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000007791 dehumidification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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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
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/62—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
A direct expansion air conditioning system suitable for a subway station and a control method thereof relate to the technical field of control of a ventilation air conditioning system of the subway station. The direct expansion air conditioning system comprises an equipment system and a control system. The equipment system comprises an environment and equipment monitoring system, a direct expansion unit control unit and a plurality of integrated control system equipment which are sequentially connected. The control system comprises a control boundary setting module and a direct expansion unit control module. The direct expansion unit control module comprises a unit mode selection module, a fan mode selection module, an air-fluorine linkage module and a cold source control module. Based on a conventional BAS system architecture, the ventilation and refrigeration integrated system architecture for the direct expansion type air conditioning system is redesigned, the system structure is simplified, the construction debugging workload is reduced, and the running stability and reliability of the system are improved; meanwhile, by means of optimized control over the direct expansion air conditioning system, control precision is improved, system operation energy efficiency is improved, and station comfort is enhanced.
Description
Technical Field
The invention relates to the technical field of control of a ventilation air-conditioning system of a subway station, in particular to a direct expansion type air-conditioning system and a control method thereof.
Background
At present, most subway stations adopt a conventional air-water air conditioning system, and a station environment and equipment monitoring system (BAS system) adopts a framework as shown in fig. 1 to realize control of a ventilation air conditioning system. The mode control and enthalpy control of large and small systems are realized through the BAS system, and each device of the air-conditioning water system is subjected to start-stop linkage and logic control through the cold water system group control device. The system is inaccurate in control mode due to the characteristics of complex form, multiple interfaces and the like, and the air system and the water system respectively and independently operate and adjust, so that the comfort level of a station is poor, and the overall operation energy efficiency of the system is low.
In the prior art, the novel direct expansion type air conditioning system cancels a chilled water delivery and distribution system by adopting a refrigerant direct evaporation mode, and fully simplifies the system form by integrally designing a cold source device and an air system. Compared with the conventional 'air-water' system, the direct expansion type air conditioning system has a greatly changed system form, and a good optimization control mode for the direct expansion type air conditioning system does not exist at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a direct expansion air conditioning system suitable for a subway station and a control method thereof. Based on a conventional BAS system architecture, the system architecture aiming at the integration of ventilation and refrigeration of a direct expansion type air conditioning system is redesigned, the system structure is simplified, the construction debugging workload is reduced, and the stable and reliable operation of the system is improved; meanwhile, by the optimized control of the direct expansion air conditioning system, the control precision is improved, the system operation energy efficiency is improved, and the station comfort level is enhanced.
In order to achieve the above object, the technical solution of the present invention is implemented as follows:
a direct expansion air conditioning system suitable for a subway station comprises an equipment system and a control system. The system is structurally characterized in that the equipment system comprises an environment and equipment monitoring system, a direct expansion unit control unit and a plurality of integrated control system equipment which are sequentially connected. The direct expansion unit control unit comprises a Modbus TCP/IP interface, an input/output module interface module and a plurality of RS-485 communication interface modules. And the environment and equipment monitoring system is connected with the Modbus TCP/IP interface to realize monitoring of system equipment. And each RS-485 communication interface module is respectively connected with the magnetic suspension cold machine, the variable frequency fan, the cooling variable frequency pump and the cooling tower variable frequency fan in the system equipment. The input/output module interface module is connected with an electric air valve, a sensor, an electric valve and a side stream water treatment device in the system equipment. The control system comprises a control boundary setting module and a direct expansion unit control module. The control boundary setting module is arranged in the environment and equipment monitoring system, and the direct expansion unit control module is arranged in the direct expansion unit control unit. The direct expansion unit control module comprises a unit mode selection module, a fan mode selection module, an air-fluorine linkage module and a cold source control module, the control boundary setting module is connected to the unit mode selection module, and the unit mode selection module respectively controls the fan mode selection module, the air-fluorine linkage module and the cold source control module.
The control method of the direct expansion air conditioning system suitable for the subway station comprises the following steps:
1) the control boundary setting module presets indoor air target parameters.
2) And issuing a fan starting and stopping or frequency adjusting instruction to the direct expansion unit control module, and determining whether the instruction content takes effect according to the selection of the unit mode selection module.
3) The direct expansion unit control module takes the parameters as control targets, and the unit mode selection module, the fan mode selection module, the air-fluorine linkage module and the cold source control module respectively complete adjustment and execute regulation and control on equipment.
4) Executing the following operations according to a control strategy built in the fan mode selection module: the combined air supply and exhaust mode of the air supply machine and the air return fan, the opening and closing of each air valve and the frequency adjustment of the air return fan;
5) the air fluorine linkage module controls the frequency of the air feeder and the magnetic suspension cold machine compressor to carry out optimization control according to different load working conditions;
6) and performing combined optimization control on the cold source measurement according to a control strategy built in the cold source control module.
In the above control method, the air target parameters include indoor temperature, humidity, and pressure parameters.
Because the invention adopts the direct expansion air conditioning system and provides a set of control strategy matched with the direct expansion air conditioning system based on the system, the invention has the following beneficial effects:
(1) compared with the traditional air-water air conditioning system, the system adopts an integrated design, and reduces the number of interfaces and the complexity of the system, thereby reducing the workload of design, construction debugging and operation maintenance, and increasing the operation stability, reliability, easy maintenance and simplicity of operation of the system.
(2) The control method reduces the energy consumption by more than 30% compared with the conventional system on the basis of improving the control refinement degree of the system and the indoor environment comfort level.
The invention is further described with reference to the following figures and detailed description.
Drawings
FIG. 1 is a schematic diagram of a prior art "air-water" air conditioning system;
FIG. 2 is a schematic structural diagram of an apparatus system according to the present invention;
FIG. 3 is a schematic diagram of a control system according to the present invention;
FIG. 4 is a flowchart illustrating a control of a heat sink according to an embodiment of the present invention.
Detailed Description
Referring to fig. 2 and 3, the present invention is applicable to a direct expansion air conditioning system for a subway station, which includes an equipment system and a control system. The equipment system comprises an environment and equipment monitoring system 1, a direct expansion unit control unit 2 and a plurality of integrated control system equipment which are sequentially connected. The direct expansion unit control unit 2 comprises a Modbus TCP/IP interface 3, an input/output module interface module 5 and a plurality of RS-485 communication interface modules 4. The environment and equipment monitoring system 1 is connected with the Modbus TCP/IP interface 3 to realize monitoring of system equipment. Each RS-485 communication interface module 4 is respectively connected with a magnetic suspension cold machine 6, a variable frequency fan 7, a cooling variable frequency pump 8 and a cooling tower variable frequency fan 9 in the system equipment. The input/output module interface module 5 is connected with an electric air valve 10, a sensor 11, an electric valve 12 and a side stream water treatment device 13 in the system device. The control system comprises a control boundary setting module 21 and a direct expansion unit control module 22; the control boundary setting module 21 is arranged in the environment and equipment monitoring system 1, and the direct expansion unit control module 22 is arranged in the direct expansion unit control unit 2. The direct expansion unit control module 22 comprises a unit mode selection module 23, a fan mode selection module 24, an air-fluorine linkage module 25 and a cold source control module 26, the control boundary setting module 21 is connected to the unit mode selection module 23, and the unit mode selection module 23 controls the fan mode selection module 24, the air-fluorine linkage module 25 and the cold source control module 26 respectively.
The working principle of each functional module in the control module 22 of the direct expansion unit is as follows:
1. unit mode selection module 23
The unit has two operation modes, one of them is: a manual operation mode; the second step is as follows: an automatic run mode.
1) Manual operation mode:
a) an air conditioning mode: air quantity receiving upper-level control instruction and cold quantity automatic regulation
In the mode, the frequency of the variable-frequency fan 7 receives a superior control instruction, and the magnetic suspension cold machine 6 automatically completes variable-frequency adjustment according to the load.
b) And (3) ventilation mode: magnetic suspension refrigerator 6 stopping
In the mode, the magnetic suspension cold machine 6 stops receiving the superior control instruction, and the system only receives the start-stop and frequency modulation control of the frequency conversion fan 7 by the superior control unit.
2) An automatic operation mode:
a) in a first mode: automatic air quantity regulation and automatic cold quantity regulation
In the mode, the air quantity and the cold quantity are automatically adjusted by the air-fluorine linkage module to frequency adjustment of the variable frequency fan 7 and the magnetic suspension cold machine 6. No upper level control instructions are accepted.
b) And a second mode: automatic regulation of fixed air quantity and cold quantity
In the mode, the air quantity needs to be manually set on the upper touch screen, the magnetic suspension cold machine 6 automatically adjusts the cold quantity output according to the frequency of the variable frequency fan 7, and does not receive the control instruction of the upper level.
c) And a third mode: fixed air quantity and fixed cold quantity
In the mode, the air quantity and the cold quantity are manually set on the upper touch screen, and the upper control instruction is not accepted.
d) And a fourth mode: ventilation mode, magnetic levitation chiller 6 stops
In this mode, the magnetic levitation cold machine 6 does not have a starting condition, and only the start-stop and frequency modulation control of the variable frequency fan 7 can be performed.
2. Fan mode selection module 24
The fan mode selection module 24 comprises functional sections of air supply and exhaust mode selection, fan air valve linkage protection, air return fan frequency control and the like.
1) Air supply and exhaust mode selection: and according to the intelligent judgment of the air quantity of the single fan and the real-time fresh air temperature acquired by the sensor, selecting the optimal fan combination under different working conditions. There are three patterns: a feeding-only and non-discharging mode, a discharging-only and non-feeding mode, and a discharging and combining mode. The method comprises the following specific steps:
a. only discharge and not send: under the ventilation mode, when the single fan can satisfy the fresh air volume demand, and the fresh air temperature that the sensor gathered is not less than the mode switch critical temperature that the module optimization confirmed, select only to arrange not to send the mode, promptly under this mode, only open back the exhaust fan, do not open the forced draught blower. The fresh air exhaust valve and the air return valve are fully opened, the negative pressure is maintained in the room, and fresh air enters the room through the station entrance and exit.
b. Only sending and not discharging: under the ventilation mode, when the single fan can satisfy the fresh air volume demand, and the fresh air temperature that the sensor gathered is less than the module and optimizes the mode switch critical temperature who confirms, select only to send not arrange the mode, promptly under this mode, only open the forced draught blower, do not open back the exhaust fan. The new and exhaust valves are fully opened, the return valve is closed, positive pressure is maintained indoors, and exhaust air is exhausted outdoors through the station entrance and exit.
c. And (3) feeding and discharging combination: when the single fan can not meet the requirement of fresh air volume, the wind speed at the inlet and the outlet is too high or the cooling is supplied in summer, the air supply and exhaust combination mode is selected, namely, under the mode, the air feeder and the air return exhaust fan are simultaneously started. The new and exhaust valves are closed, the return valve is opened, and the micro-positive pressure is maintained indoors.
2) Fan blast gate interlocking protection: when the fresh air valve and the air mixing valve are closed, the stop state air feeder does not execute the starting instruction, and the running state air feeder executes the stop instruction. Similarly, when the exhaust valve and the air mixing valve are closed, the exhaust fan in the stop state does not execute the starting instruction, and the exhaust fan in the running state executes the stopping instruction.
3) Controlling the frequency of the return air exhaust fan: when the return air exhaust fan operates, the air exhaust volume is calculated in real time according to the indoor fresh air volume requirement or the indoor micro-positive pressure requirement and the rated air supply and exhaust volume ratio. In order to reduce the control difficulty, the air quantity of the fan and the frequency of the fan are considered to be in a direct proportion relation, and then the frequency of the return air exhaust fan can be determined according to the air exhaust quantity.
3. Wind and fluorine linkage module 25
And judging the drying/dehumidifying working condition according to the indoor humidity data acquired by the sensor and the indoor air parameter preset by the BSA system. When the dehumidification is in a working condition, the target value of the air supply temperature needs to be reduced, dew point dehumidification is carried out, and then the indoor humidity requirement is met. Therefore, the target value of the blowing air temperature is adjusted according to the indoor humidity condition, and the frequency of the blower is controlled according to the indoor temperature. And in a dry working condition, optimizing and controlling the air supply temperature according to the energy consumption of the air feeder and the influence of the air supply temperature on the energy consumption of the magnetic suspension cold machine 6, namely establishing a model relation between the air feeder and the energy consumption of the magnetic suspension cold machine 6, and optimizing the set value of the air supply state point through the model so as to determine the target value of the air supply temperature under different load working conditions. And after the set value of the air supply temperature state is determined, sending an instruction to the magnetic suspension cold machine 6.
4. Cold source control module 26
The cold source control aims at performing energy efficiency optimal control on the cold energy required to be provided by the cold source and ensuring the optimal control on the system energy efficiency under the corresponding cold energy.
Since the energy consumption of devices in a cold station is coupled to each other, reducing the energy consumption of a device of a certain type alone may cause an increase in the energy consumption of the entire system. For example, by reducing the flow rate of cooling water (by means of frequency conversion, closing a valve and the like), the power consumption of the cooling variable frequency pump 8 can be reduced, but the condensation temperature of the magnetic suspension cold machine 6 can be increased, and the efficiency of the magnetic suspension cold machine 6 is adversely affected; and the frequency conversion fan 9 of the cooling tower is increased, so that the condensation temperature of the magnetic suspension cold machine 6 is reduced although the power consumption of the frequency conversion fan 9 of the cooling tower is increased, and the operation efficiency of the magnetic suspension cold machine 6 is improved. Therefore, the energy-saving regulation of each device alone cannot achieve the optimal overall efficiency of the cold source, and the energy-saving strategy should aim at the lowest overall energy consumption of the cold source.
In order to reduce the optimizing difficulty brought by system coupling, the control of the cooling tower variable frequency fan 9 with lower energy consumption is simplified as follows: under the conditions of different wet bulb temperatures, when the air-water ratio of the cooling tower reaches 1.1-1.5 or the efficiency reaches the maximum value of 80%, the frequency of the variable frequency fan 9 of the cooling tower is increased, and the cooling effect of the cooling tower on cooling water tends to be stable. Therefore, during regulation and control, the frequency of the variable frequency fan 9 of the cooling tower is increased as much as possible in a simple control mode until the air-water ratio or the efficiency of the cooling tower is in a corresponding range.
After the cooling tower variable frequency fan 9 is removed, an ash box model is built for the remaining equipment, and then optimization control is performed according to the built equipment model, as shown in fig. 4. In order to improve the optimization stability, the optimization step length of each device is properly prolonged, such as: the frequency of the water pump is optimized by taking 3Hz as a step length.
The invention discloses a control method of a direct expansion air conditioning system suitable for a subway station, which comprises the following steps:
1) the control boundary setting module 21 presets indoor air target parameters.
2) And issuing a fan start-stop or frequency adjustment instruction to the direct expansion unit control module 22, and determining whether the instruction content takes effect according to the selection of the unit mode selection module 23. For example, when the unit mode is manual operation, the starting, stopping and operating frequency of the fan are executed according to the BAS instruction, and the magnetic suspension refrigerator 6 automatically completes frequency conversion adjustment according to the load; when the unit mode is the automatic operation mode, only the fan start-stop action instruction issued by the BAS is effective, the fan operation frequency and the output of the magnetic suspension refrigerator 6 are automatically adjusted by the air-fluorine linkage module 5, and the upper-level control instruction is not received.
3) The direct expansion unit control module 22 takes the parameters as control targets, and the unit mode selection module 23, the fan mode selection module 24, the wind and fluorine linkage module 25 and the cold source control module 26 respectively complete adjustment and execute regulation and control of equipment.
4) The following operations are performed according to a control strategy built in the fan mode selection module 24: the combined mode of air supply and exhaust of the air supply machine and the air return exhaust machine, the opening and closing of each air valve and the frequency adjustment of the air return exhaust machine.
5) The air fluorine linkage module 25 controls the frequency of the air feeder and the compressor of the magnetic suspension cold machine 6 to carry out optimized control according to different load working conditions. For example, when the module judges that the module is in a dehumidification working condition, the magnetic suspension cold machine 6 adjusts output according to the indoor humidity load, cools the air supply temperature to the dew point temperature, and the frequency of the air supply machine is adjusted in a stepping mode according to the indoor temperature and the preset indoor target temperature; when the module judges that the working condition is dry, a physical model is established according to the influence of the power consumption of the air feeder and the evaporation temperature on the power consumption of the magnetic suspension cold machine 6, air feeding state points under different loads are searched, and the output of the magnetic suspension cold machine 6 and the air feeder is adjusted in real time.
6) And performing combined optimization control on the cold source measurement according to a control strategy built in the cold source control module 26. The frequency of the cooling tower variable frequency fan 9 is controlled according to a fixed air-water ratio (such as 1.3) or the efficiency (such as 80%) of the cooling tower variable frequency fan 9; and establishing an ash box model of the power consumption of the cooling variable frequency pump 8 and the power consumption of the magnetic suspension cold machine 6, and carrying out optimization control on the frequency of the cooling variable frequency pump 8 and the output of the magnetic suspension cold machine 6 according to the model. In order to improve the stability of the optimization, the optimization step length of each device is appropriately prolonged, for example, the adjustment step length of the cooling variable frequency pump 8 is set to be 3 Hz.
In addition, the magnetic suspension refrigerator 6, the cooling variable frequency pump 8, the cooling tower variable frequency fan 9 and the cooling water electric butterfly valve in the control method follow the basic startup and shutdown interlocking sequence:
startup interlocking: cooling water electric butterfly valve → cooling variable frequency pump 8 → cooling tower variable frequency fan 9 → magnetic suspension refrigerator 6;
shutdown interlocking: the magnetic suspension cooler 6 → the cooling variable frequency pump 8 is turned off after delaying for 2min → the cooling water electric butterfly valve → the cooling tower variable frequency fan 9.
Claims (3)
1. A direct expansion air conditioning system suitable for a subway station comprises an equipment system and a control system, and is characterized in that the equipment system comprises an environment and equipment monitoring system (1), a direct expansion unit control unit (2) and a plurality of system equipment which are integrally controlled, wherein the environment and equipment monitoring system, the direct expansion unit control unit and the system equipment are sequentially connected; the direct expansion unit control unit (2) comprises a Modbus TCP/IP interface (3), an input/output module interface module (5) and a plurality of RS-485 communication interface modules (4); the environment and equipment monitoring system (1) is connected with the Modbus TCP/IP interface (3) to realize monitoring of system equipment; each RS-485 communication interface module (4) is respectively connected with a magnetic suspension cold machine (6), a variable frequency fan (7), a cooling variable frequency pump (8) and a cooling tower variable frequency fan (9) in system equipment; the input and output module interface module (5) is connected with an electric air valve (10), a sensor (11), an electric valve (12) and a bypass water treatment device (13) in system equipment; the control system comprises a control boundary setting module (21) and a direct expansion unit control module (22); the control boundary setting module (21) is arranged in the environment and equipment monitoring system (1), the direct expansion unit control module (22) is arranged in the direct expansion unit control unit (2), the direct expansion unit control module (22) comprises a unit mode selection module (23), a fan mode selection module (24), an air-fluorine linkage module (25) and a cold source control module (26), the control boundary setting module (21) is connected to the unit mode selection module (23), and the unit mode selection module (23) respectively controls the fan mode selection module (24), the air-fluorine linkage module (25) and the cold source control module (26).
2. The control method of the direct expansion air conditioning system suitable for the subway station as claimed in claim 1, comprising the steps of:
1) the control boundary setting module (21) presets indoor air target parameters;
2) sending a fan start-stop or frequency regulation instruction to a direct expansion unit control module (22), and determining whether the instruction content takes effect according to the selection of a unit mode selection module (23);
3) the direct expansion unit control module (22) takes the parameters as control targets, and the unit mode selection module (23), the fan mode selection module (24), the air-fluorine linkage module (25) and the cold source control module (26) respectively complete adjustment and execute regulation and control on equipment;
4) executing the following operations according to a control strategy built in a fan mode selection module (24): the combined air supply and exhaust mode of the air supply machine and the air return exhaust machine, the opening and closing of each air valve and the frequency regulation of the air return exhaust machine;
5) the frequency of the air feeder and the frequency of the cold machine compressor are controlled by the air and fluorine linkage module (25) to carry out optimized control according to different load working conditions;
6) and performing combined optimization control on the cold source measurement according to a control strategy built in the cold source control module (26).
3. The control method of the direct expansion air conditioning system suitable for the subway station as claimed in claim 2, wherein the control system architecture adopts an integrated design integration, reducing the number of interfaces; the control strategy is matched with the control system architecture.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013149107A1 (en) * | 2012-03-30 | 2013-10-03 | Storm Brian F | Sport field cooling system and method |
| JP2015117918A (en) * | 2013-12-20 | 2015-06-25 | 株式会社日立製作所 | Heat accumulation system and heat accumulation system control method |
| CN106989490A (en) * | 2017-05-11 | 2017-07-28 | 同方节能工程技术有限公司 | A kind of energy-saving control system suitable for subway ventilation air-conditioning |
| CN107218654A (en) * | 2017-06-05 | 2017-09-29 | 中铁第四勘察设计院集团有限公司 | The control method and air-conditioning system of air-conditioning system |
| CN109764485A (en) * | 2018-12-25 | 2019-05-17 | 中国铁路总公司 | A kind of air conditioner energy saving control method and device based on comfort level |
| CN111694388A (en) * | 2020-05-06 | 2020-09-22 | 广州地铁设计研究院股份有限公司 | Intelligent subway monitoring system and control method |
-
2021
- 2021-03-01 CN CN202110222772.XA patent/CN114992729A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013149107A1 (en) * | 2012-03-30 | 2013-10-03 | Storm Brian F | Sport field cooling system and method |
| JP2015117918A (en) * | 2013-12-20 | 2015-06-25 | 株式会社日立製作所 | Heat accumulation system and heat accumulation system control method |
| CN106989490A (en) * | 2017-05-11 | 2017-07-28 | 同方节能工程技术有限公司 | A kind of energy-saving control system suitable for subway ventilation air-conditioning |
| CN107218654A (en) * | 2017-06-05 | 2017-09-29 | 中铁第四勘察设计院集团有限公司 | The control method and air-conditioning system of air-conditioning system |
| CN109764485A (en) * | 2018-12-25 | 2019-05-17 | 中国铁路总公司 | A kind of air conditioner energy saving control method and device based on comfort level |
| CN111694388A (en) * | 2020-05-06 | 2020-09-22 | 广州地铁设计研究院股份有限公司 | Intelligent subway monitoring system and control method |
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