CN111351151B - Variable air volume fresh air dehumidification system for underground engineering and control method thereof - Google Patents
Variable air volume fresh air dehumidification system for underground engineering and control method thereof Download PDFInfo
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- CN111351151B CN111351151B CN202010154656.4A CN202010154656A CN111351151B CN 111351151 B CN111351151 B CN 111351151B CN 202010154656 A CN202010154656 A CN 202010154656A CN 111351151 B CN111351151 B CN 111351151B
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/1405—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification in which the humidity of the air is exclusively affected by contact with the evaporator of a closed-circuit cooling system or heat pump circuit
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
The invention discloses an underground engineering variable air volume fresh air dehumidifying system and a control method thereof. The system comprises an air inlet pipe, an air inlet static pressure box, at least three dehumidifiers, an air outlet static pressure box, a variable frequency fan and an air outlet pipe, wherein an air outlet of the air inlet pipe is communicated with an air inlet of the air inlet static pressure box, an air inlet of the dehumidifier is communicated with an air outlet of the air inlet static pressure box, an air outlet of the dehumidifier is communicated with an air inlet of the air outlet static pressure box, an air outlet of the air outlet static pressure box is communicated with an air inlet of the variable frequency fan, an air outlet of the variable frequency fan is communicated with an air inlet of the air outlet pipe, the air outlet pipe is provided with an air quantity sensor, and a connecting channel between; the air quantity sensor is used for detecting the running air quantity of the air quantity sensor, and the control device is used for controlling the opening and closing of each electric closed air valve and the dehumidifier according to the running air quantity detected by the air quantity sensor, so that the air quantity sensor can adapt to the variable air quantity variable load running of a system, and has the advantages of wide application range, strong variable load adaptability and high automation degree.
Description
Technical Field
The invention relates to the technical field of ventilation and dehumidification, in particular to an underground ventilation and dehumidification system.
Background
For underground engineering, when fresh air needs to be subjected to centralized dehumidification, a full fresh air dehumidifier needs to be adopted for dehumidification. When the underground engineering is large in scale, the required fresh air volume is large, but the fresh air demand in the underground engineering is changed in real time, and a fresh air dehumidification system is required to have strong air volume changing adaptability.
However, the existing fresh air dehumidification system is difficult to operate efficiently and reliably when the fresh air demand is low.
Disclosure of Invention
In view of the above, the present invention aims to provide an underground engineering variable air volume fresh air dehumidification system with wide application range, strong load-varying adaptability and high automation degree and a control method thereof; in addition, the invention also aims to provide a plurality of dehumidifiers to reasonably control the opening and the closing of the dehumidifiers, thereby achieving the purpose of energy conservation.
In order to achieve the above purpose, in a first aspect, the invention adopts the following technical solutions:
an air quantity variable fresh air dehumidifying system for underground engineering comprises an air inlet pipe, an air inlet static pressure box, at least three dehumidifiers, an air outlet static pressure box, a variable frequency fan and an air outlet pipe, wherein the air inlet static pressure box comprises an air inlet and air outlets which are respectively arranged in one-to-one correspondence with the at least three dehumidifiers, the air outlet static pressure box comprises an air outlet and air inlets which are respectively arranged in one-to-one correspondence with the at least three dehumidifiers, the air outlet of the air inlet pipe is communicated with the air inlet of the air inlet static pressure box, the air inlet of the dehumidifier is communicated with the air outlet of the air inlet static pressure box corresponding to the air inlet, the air outlet of the dehumidifier is communicated with the air inlet of the variable frequency fan, the air outlet of the variable frequency fan is communicated with the air inlet of the air outlet pipe, and the air quantity sensor is arranged, the air inlet static pressure box is used for detecting the running air quantity of the system, and an electric closed air valve is arranged on a connecting channel between the air outlet of each dehumidifier and the corresponding air inlet of the air outlet static pressure box;
the system further comprises a control device, the control device is in communication connection with the dehumidifiers, the electric closed air valves and the air volume sensor, and the control device is used for controlling the opening and closing of the electric closed air valves and the dehumidifiers according to the running air volume detected by the air volume sensor.
Preferably, an air volume regulating valve is arranged on a connecting channel between the air inlet of each dehumidifier and the corresponding air outlet of the air inlet static pressure box.
Preferably, the compressor of the dehumidifier is a digital vortex compressor or a variable frequency vortex compressor, and the control device is further used for controlling the capacity or the working frequency of the compressor according to the running air volume detected by the air volume sensor.
Preferably, the dehumidifier is provided with three dehumidifiers, and the rated air volume of each dehumidifier is 10000m3The minimum running fresh air volume is 30 percent of the rated air volume;
the maximum fresh air volume of the system is 30000m3H, the minimum fresh air volume is 3000m3/h。
Preferably, the dehumidifier includes a compressor, an evaporator, a condenser, an expansion valve, a first heat exchanger and a second heat exchanger, the first heat exchanger includes a first refrigerant branch and a first water branch capable of exchanging heat with each other, the second heat exchanger includes a second refrigerant branch and a second water branch capable of exchanging heat with each other, and further includes a first three-way control valve and a second three-way control valve, an exhaust port of the compressor is communicated with a first port of the first three-way valve, a second port of the first three-way valve is communicated with a refrigerant inlet of the condenser, a third port of the first three-way valve is communicated with a refrigerant inlet of the first refrigerant branch, a refrigerant outlet of the condenser and a refrigerant outlet of the first refrigerant branch are merged into one end of the expansion valve, the other end of the expansion valve is communicated with the first port of the second three-way valve, a second port of the second three-way valve is communicated with a refrigerant inlet of the evaporator, a third port of the second three-way valve is communicated with a refrigerant inlet of a second refrigerant branch of the second heat exchanger, and a refrigerant outlet of the evaporator and a refrigerant outlet of the second refrigerant branch are converged into an air suction port of the compressor;
the control system is also used for controlling the opening degrees of the first three-way valve and the second three-way valve according to the running air volume detected by the air volume sensor so as to control the proportion of the refrigerants flowing to the condenser and the first refrigerant branch and control the proportion of the refrigerants flowing to the evaporator and the second refrigerant branch.
Preferably, the air conditioner further comprises a third three-way valve and a temperature sensor arranged on the air outlet pipe, wherein an outlet of the first water branch is communicated with a first port of the third three-way valve, a second port of the third three-way valve is connected with a water inlet of a heating water pipe, a third port of the third three-way valve is connected with an inlet of a cold water tank through a pipeline, a water outlet of the heating water pipe and an outlet of the cold water tank are converged into an inlet of the first water branch, and the heating water pipe is used for heating the air outlet pipe;
the control system is also used for controlling the opening of the third three-way valve according to the temperature detected by the temperature sensor so as to control the proportion of water flowing to the heating water pipe and the cold water tank.
Preferably, the outlet of the second water branch is connected with the water inlet of a cooling water pipe, the water outlet of the cooling water pipe is connected with the inlet of the second water branch, and the cooling water pipe is used for cooling electric appliances in the system.
In order to achieve the above purpose, in a second aspect, the invention adopts the following technical scheme:
a control method of the underground engineering variable air volume fresh air dehumidification system comprises the following steps:
acquiring the current operation air volume detected by the air volume sensor;
determining a control strategy according to the current operation air volume;
and controlling the opening and closing of each electric closed air valve and each dehumidifier according to the control strategy.
Preferably, the system is the system as claimed in claim 4, and the determination method of the control strategy comprises:
when the current operation air volume is more than 200003H is not more than 300003When the air volume of the dehumidifier is 1/3 of the current operation air volume, the control strategy is to control the three electric closed air valves to be in an open state and control the three dehumidifiers to operate;
when the current operation air volume is more than 100003H is not more than 200003When the air volume is larger than the preset air volume, the control strategy is to control two of the three electric closed air valves to be in an open state and control the corresponding two dehumidifiers to operate, and the operation air volume of each dehumidifier is 1/2 of the current operation air volume;
when the current operation air volume is more than or equal to 30003H is 10000 or less3And when the air volume is larger than the preset air volume, controlling one of the three electric closed air valves to be in an open state and controlling the corresponding dehumidifier to operate according to the control strategy, wherein the operation air volume of the dehumidifier is the current operation air volume.
Preferably, the total operation time of each dehumidifier is counted, when a newly-added operating dehumidifier is needed, the dehumidifier with the shortest total operation time in the dehumidifiers in the closed state is selected to be started, and when the operating dehumidifier is needed to be closed, the dehumidifier with the longest total operation time in the dehumidifiers in the operating state is selected to be closed.
The underground engineering variable air volume fresh air dehumidifying system provided by the invention is provided with a plurality of dehumidifiers, and the working states of the dehumidifiers can be adjusted in real time according to the air volume requirement through the control device, so that the underground engineering variable air volume fresh air dehumidifying system can adapt to variable air volume variable load operation of the system, and has the advantages of wide application range, strong variable load adaptability and high automation degree.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of an underground engineering variable air volume fresh air dehumidification system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a dehumidifier according to an embodiment of the present invention;
fig. 3 shows a flowchart of a control method of the variable air volume fresh air dehumidification system for underground engineering according to an embodiment of the present invention.
In the figure:
1. an air inlet pipe; 2. an air inlet static pressure box; 3. a dehumidifier; 31. a compressor; 32. an evaporator; 33. a condenser; 34. an expansion valve; 35. a first heat exchanger; 351. a first refrigerant branch; 352. a first water branch; 36. a second heat exchanger; 361. a second refrigerant branch; 362. a second water branch; 37. a first three-way valve; 38. a second three-way valve; 4. an air outlet static pressure box; 5. a variable frequency fan; 6. an air outlet pipe; 61. an air quantity sensor; 7. an electric airtight air valve; 8. a control device; 9. an air volume adjusting valve.
Detailed Description
The present invention is described below based on embodiments, and it will be understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
Aiming at the problem that the existing underground engineering fresh air dehumidifying system is difficult to operate efficiently and reliably when the fresh air demand is low, the application provides an underground engineering variable air volume fresh air dehumidifying system, referring to figure 1, the system comprises an air inlet pipe 1, an air inlet static pressure box 2, at least three dehumidifiers 3, an air outlet static pressure box 4, a variable frequency fan 5 and an air outlet pipe 6, wherein the air inlet static pressure box 2 comprises an air inlet and air outlets respectively corresponding to the at least three dehumidifiers 3, the air outlet static pressure box 4 comprises an air outlet and air inlets respectively corresponding to the at least three dehumidifiers 3, the air outlet of the air inlet pipe 1 is communicated with the air inlet of the air inlet static pressure box 2, the air inlet of the dehumidifier 3 is communicated with the air outlet of the air inlet static pressure box 2 corresponding to the air inlet, the air outlet of the dehumidifier 3 is communicated with the air inlet of the air outlet static pressure box 4 corresponding to, therefore, each dehumidifier 3 forms a dehumidification branch, the air outlet of the air outlet static pressure box 4 is communicated with the air inlet of the variable frequency fan 5, the air outlet of the variable frequency fan 5 is communicated with the air inlet of the air outlet pipe 6, the air outlet pipe 6 is provided with an air quantity sensor 61 for detecting the running air quantity of the system, a connecting channel between the air outlet of each dehumidifier 3 and the corresponding air inlet of the air outlet static pressure box 4 is provided with an electric closed air valve 7, and the electric closed air valve 7 is used for controlling the on and off of the dehumidification branch in which the electric closed air valve is positioned.
The airflow flow path of the system is that fresh air enters an air inlet static pressure box 2 from an air inlet pipe 1, dynamic pressure is reduced, static pressure is increased, airflow is stabilized and airflow vibration is reduced through the air inlet static pressure box 2, air outlet of the air inlet static pressure box 2 flows into dehumidification branches in a conduction state respectively, the dehumidifier 3 is used for dehumidifying the air, the dehumidified airflow is converged into an air outlet static pressure box 4, the air outlet static pressure box 4 reduces the dynamic pressure, increases the static pressure, stabilizes the airflow and reduces the airflow vibration again, air outlet of the air outlet static pressure box 4 is pumped into an air outlet pipe 6 through a variable frequency fan 5, and the air outlet pipe 6 is sent to each position of underground engineering.
The system further comprises a control device 8, the control device 8 is in communication connection with each dehumidifier 3, each electric closed air valve 7 and the air volume sensor 61, and the control device 8 is used for controlling the opening and closing of each electric closed air valve 7 and each dehumidifier 3 according to the running air volume detected by the air volume sensor 61, so that the working state of the dehumidifier 3 can be adjusted in real time through the control device 8 according to the air volume requirement, the system can adapt to the variable air volume variable load running of the system, and the system is wide in application range, strong in variable load adaptability and high in automation degree.
It is understood that the number of the dehumidifier 3 may be three as shown in fig. 1, or may be four or more according to specific requirements.
In order to make the airflow flowing out from the inlet static pressure box 2 uniformly flow into each dehumidification branch in a conducting state, preferably, as shown in fig. 1, an air volume regulating valve 9 is arranged on a connecting channel between each dehumidifier 3 and the air inlet and the corresponding air outlet of the inlet static pressure box 2, so that the air flowing out from the inlet static pressure box 2 is uniformly distributed into each dehumidification branch in a conducting state through the air volume regulating valve 9.
In order to improve the load change adaptability of the dehumidifier 3, the application improves all components of the dehumidifier 3, so that the underground engineering variable air volume fresh air dehumidifying system provided by the application can be suitable for various different temperature and humidity environments.
For example, in one embodiment, the compressor of the dehumidifier 3 is a digital vortex compressor or an inverter vortex compressor, and the control device 8 is further configured to control the capacity or the operating frequency of the compressor according to the operating air volume detected by the air volume sensor 61, so as to obtain more accurate load control, for example, when the operating air volume is higher, the operating capacity or the operating frequency of the compressor is increased, and when the operating air volume is lower, the operating capacity or the operating frequency of the compressor is decreased.
Further preferably, the internal structure composition of the dehumidifier 3 can be improved, a compressor, an evaporator and a condenser are arranged in a refrigerant circulation loop of a conventional dehumidifier, the evaporator is used for dehumidifying air flow, and the condenser is used for heating the dehumidified air flow, the dehumidifier with the conventional structure has very limited load adjusting capacity, and even if the compressor is set as a digital or variable frequency compressor, the compressor can only be adjusted within a relatively small range, based on this, as shown in fig. 2, the dehumidifier 3 provided by the application comprises the compressor 31, the evaporator 32, the condenser 33, the expansion valve 34, the first heat exchanger 35 and the second heat exchanger 36, the first heat exchanger 35 comprises a first refrigerant branch 351 and a first water branch 352 capable of exchanging heat with each other, the second heat exchanger 36 comprises a second refrigerant branch 361 and a second water branch 362 capable of exchanging heat with each other, and further includes a first three-way control valve 37 and a second three-way control valve 38, the discharge port of the compressor 31 is communicated with a first port of the first three-way valve 37, a second port of the first three-way valve 37 communicates with a refrigerant inlet of the condenser 33, a third port of the first three-way valve communicates with a refrigerant inlet of the first refrigerant branch 351, a refrigerant outlet of the condenser 33 and a refrigerant outlet of the first refrigerant branch 351 are merged into one end of the expansion valve 34, the other end of the expansion valve 34 is communicated with a first port of the second three-way valve 38, a second port of the second three-way valve 38 is communicated with a refrigerant inlet of the evaporator 32, the third port of the second three-way valve 38 communicates with the refrigerant inlet of the second refrigerant branch 362 of the second heat exchanger 36, a refrigerant outlet of the evaporator 32 and a refrigerant outlet of the second refrigerant branch 361 are merged into a suction port of the compressor 31. In the airflow passage of the dehumidifier 3, the evaporator 32 is located on the upstream side of the condenser 33, the evaporator 32 is used for dehumidifying the airflow, and the condenser 33 is used for heating the dehumidified airflow. The first three-way valve 37 is used for controlling the refrigerant ratio between the condenser 33 and the first refrigerant branch 351 so as to control the heat generation amount of the condenser 33, and other heat is taken away by the heat exchange between the first water branch 352 and the first refrigerant branch 351, the second three-way valve 38 is used for controlling the refrigerant ratio between the evaporator 32 and the second refrigerant branch 361 so as to control the cold generation amount of the evaporator 32, and other cold is taken away by the heat exchange between the second water branch 362 and the second refrigerant branch 361.
The control system is further configured to control the opening degrees of the first three-way valve 37 and the second three-way valve 38 according to the operation air volume detected by the air volume sensor 61, so as to control the refrigerant ratio flowing to the condenser 33 and the first refrigerant branch 351, and control the refrigerant ratio flowing to the evaporator 32 and the second refrigerant branch 361. The evaporator 32 has a plurality of evaporation units arranged in parallel, and the condenser 33 also has a plurality of condensation units arranged in parallel, so that the load range of the dehumidifier 3 is further expanded by controlling the first three-way valve 37 and the second three-way valve 38 in cooperation with the control of the working capacity and the working frequency of the compressor 31 and the control of the number of the evaporation units and the number of the condensation units connected to the system. Specifically, the control device controls the number of the evaporation units connected to the system (for example, each evaporation unit branch is correspondingly provided with one electromagnetic valve to control the power-on and power-off states of the respective electromagnetic valves) to change the area of the evaporator according to the load condition of the compressor 31 and the evaporation pressure of the evaporator, so as to meet the requirement of maintaining the same evaporation pressure of the refrigeration system under different load conditions and ensure the operation stability of the refrigeration system.
The heat of the first water branch 352 may be used in other locations that need to be heated, for example, the gas heated by the dehumidifier 3 has a certain temperature loss after passing through the outlet static pressure box 4, and therefore, the heat of the first water branch 352 may compensate for the temperature loss. In a preferred embodiment, the air conditioner further comprises a third three-way valve and a temperature sensor arranged on the air outlet pipe, an outlet of the first water branch 352 is communicated with a first port of the third three-way valve, a second port of the third three-way valve is connected with a water inlet of a heating water pipe, a third port of the third three-way valve is connected with an inlet of a cold water tank through a pipeline, a water outlet of the heating water pipe and an outlet of the cold water tank are converged into the inlet of the first water branch, the control system is further configured to control an opening degree of the third three-way valve according to the temperature detected by the temperature sensor so as to control a water ratio flowing to the heating water pipe and the cold water tank, the heating water pipe is used for heating the air outlet pipe 6, for example, the heating water pipe is wound on the outer side of the air outlet pipe 6, and thus when the temperature in the air outlet pipe 6 meets the temperature requirement, the water in the first, when the temperature in the air outlet pipe 6 does not meet the temperature requirement, the air outlet pipe 6 obtains different temperature compensation by adjusting the proportion of the water flows into the first water branch 352 and the cold water tank.
The cooling capacity of the second water branch 362 may be used for other locations requiring cooling, for example, for cooling of electrical devices, and in one specific embodiment, the outlet of the second water branch 362 is connected to the inlet of a cooling water pipe, and the outlet of the cooling water pipe is connected to the inlet of the second water branch 362, and the cooling water pipe is used for cooling electrical devices in the system, such as the control device 8, the compressor 31, and the like.
Through the improvement, the fresh air dehumidification system provided by the application can obtain large-range air volume adjustment, for example, in the embodiment shown in fig. 1, three dehumidifiers 3 are provided, and the rated air volume of each dehumidifier 3 is 10000m3H, the minimum running fresh air volume is 30 percent of the rated air volume, so that the maximum fresh air volume of the system is 30000m3H, the minimum fresh air volume is 3000m3H is used as the reference value. Of course, it is understood that the rated air volume of each dehumidifier 3 may be set to be different, so that the air volume adjusting range and the adjusting precision can be further improved.
Further, the present application also provides a control method of the above-mentioned underground engineering variable air volume fresh air dehumidification system, as shown in fig. 3, the control method includes:
s100, acquiring the current operation air volume detected by the air volume sensor 61;
s200, determining a control strategy according to the current running air volume;
and S300, controlling the opening and closing of each electric closed air valve 7 and each dehumidifier 3 according to the control strategy.
The following describes a method for determining a control strategy in an embodiment shown in fig. 1, where the method for determining a control strategy includes:
when the current operation air volume is more than 200003H is not more than 300003When the air volume is larger than the preset air volume, the control strategy is to control the three electric closed air valves 7 to be in an open state and control the three dehumidifiers 3 to operate, and the operation air volume of each dehumidifier 3 is 1/3 of the current operation air volume;
when the current operation air volume is more than 100003H is not more than 200003When the air volume of each dehumidifier 3 is 1/2 of the current operation air volume, the control strategy is to control two of the three electric closed air valves 7 to be in an open state and control the corresponding two dehumidifiers 3 to operate, namely, to control the two electric closed air valves to be open, one electric closed air valve to be closed, the corresponding two dehumidifiers to operate and one dehumidifier to be closed;
when the current operation air volume is more than or equal to 30003H is 10000 or less3When the air volume is in the range of the air volume, the control strategy is to control one of the three electric closed air valves 7 to be in an open state and control the corresponding dehumidifier 3 to operate, namely, control one electric closed air valve to be opened, two electric closed air valves to be closed, control the corresponding dehumidifier to operate and close the two dehumidifiers, and control the operation air volume of the dehumidifier 3 to beAnd the current running air volume.
Because a plurality of dehumidifiers 3 are arranged, in order to facilitate uniform maintenance and guarantee efficient operation of each dehumidifier 3, the present application makes the total operation time of each dehumidifier 3 in a certain period approximately the same through further improvement of a control strategy, preferably, the control strategy is optimized when the on-off state of the dehumidifier 3 needs to be changed, so as to guarantee the operation stability of the system, and avoid unstable airflow caused by sudden opening and sudden closing of the dehumidifier 3. Taking the structure shown in FIG. 1 as an example, when the current operation air volume is 60003Increase of/h to 150003When the current running air quantity is 25000, starting the dehumidifier, and when the current running air quantity is changed from 250003Reduction of/h to 150003And when the operation time is h, one dehumidifier needs to be closed, at the moment, the accumulated total operation time of the three dehumidifiers 3 is compared, and the dehumidifier with the longest total operation time is selected to be closed. Therefore, the performance index and the service life of each dehumidifier 3 can be ensured, and the dehumidifier 3 can be conveniently and uniformly maintained.
More specifically, the control device is provided with a plurality of timers for respectively timing the operation duration of each dehumidifier 3, and the control device 8 further comprises a comparator for comparing the timing duration of each timer so as to adapt to the control process. In order to avoid the timer occupying too much memory, it is preferable that the timer is periodically reset to zero, all timers are directly reset to zero, and in order to ensure the accuracy of the control, it is further preferable that the timer with the shortest timing duration is selected to be reset to zero, and the timing duration before the reset timer is subtracted from the other timers.
In order to further optimize the memory, the timer is set as a volatile memory, and the data is automatically lost to release the memory after the system is powered off. In this case, in order to ensure the accuracy of the control, it is preferable to set a storage location in the control device for storing the flag of the dehumidifier having the shortest operating time, and to start the dehumidifier having the shortest operating time first after the system is turned on again.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The variable air volume fresh air dehumidifying system for the underground engineering is characterized by comprising an air inlet pipe, an air inlet static pressure box, at least three dehumidifiers, an air outlet static pressure box, a variable frequency fan, a control system and an air outlet pipe, wherein the air inlet static pressure box comprises an air inlet and air outlets which are respectively arranged in one-to-one correspondence with the at least three dehumidifiers, the air outlet static pressure box comprises an air outlet and air inlets which are respectively arranged in one-to-one correspondence with the at least three dehumidifiers, the air outlet of the air inlet pipe is communicated with the air inlet of the air inlet static pressure box, the air inlet of the dehumidifier is communicated with the air outlet of the air inlet static pressure box corresponding to the air inlet, the air outlet of the dehumidifier is communicated with the air inlet of the air outlet static pressure box corresponding to the air outlet static pressure box, the air outlet of the air outlet static, the air outlet pipe is provided with an air quantity sensor for detecting the running air quantity of the system, and a connecting channel between the air outlet of each dehumidifier and the corresponding air inlet of the air outlet static pressure box is provided with an electric closed air valve;
the system also comprises a control device, wherein the control device is in communication connection with each dehumidifier, each electric closed air valve and the air volume sensor, and is used for controlling the opening and closing of each electric closed air valve and each dehumidifier according to the running air volume detected by the air volume sensor;
the dehumidifier comprises a compressor, an evaporator, a condenser, an expansion valve, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger comprises a first refrigerant branch and a first water branch which can exchange heat with each other, the second heat exchanger comprises a second refrigerant branch and a second water branch which can exchange heat with each other, the dehumidifier also comprises a first three-way valve and a second three-way valve, an exhaust port of the compressor is communicated with a first port of the first three-way valve, a second port of the first three-way valve is communicated with a refrigerant inlet of the condenser, a third port of the first three-way valve is communicated with a refrigerant inlet of the first refrigerant branch, a refrigerant outlet of the condenser and a refrigerant outlet of the first refrigerant branch are converged into one end of the expansion valve, the other end of the expansion valve is communicated with the first port of the second three-way valve, a second port of the second three-way valve is communicated with a refrigerant inlet of the evaporator, a third port of the second three-way valve is communicated with a refrigerant inlet of a second refrigerant branch of the second heat exchanger, and a refrigerant outlet of the evaporator and a refrigerant outlet of the second refrigerant branch are converged into an air suction port of the compressor;
the control system is also used for controlling the opening degrees of the first three-way valve and the second three-way valve according to the running air volume detected by the air volume sensor so as to control the proportion of the refrigerants flowing to the condenser and the first refrigerant branch and control the proportion of the refrigerants flowing to the evaporator and the second refrigerant branch.
2. An underground engineering variable air volume fresh air dehumidifying system as claimed in claim 1 wherein each dehumidifier is provided with an air volume regulating valve on a connecting passage between the air inlet and the corresponding air outlet of the air inlet static pressure box.
3. The underground engineering variable air volume fresh air dehumidifying system of claim 1, wherein a compressor of the dehumidifier is a digital vortex compressor or a variable frequency vortex compressor, and the control device is further configured to control the working capacity or the working frequency of the compressor according to the running air volume detected by the air volume sensor.
4. An underground engineering variable air volume fresh air dehumidifying system as claimed in any one of claims 1 to 3 wherein there are three dehumidifiers, and the rated air volume of each dehumidifier is 10000m3The minimum running fresh air volume is 30 percent of the rated air volume;
the maximum fresh air volume of the system is 30000m3H, the minimum fresh air volume is 3000m3/h。
5. The underground engineering variable air volume fresh air dehumidification system according to claim 1, further comprising a third three-way valve and a temperature sensor arranged on the air outlet pipe, wherein an outlet of the first water branch is communicated with a first port of the third three-way valve, a second port of the third three-way valve is connected with a water inlet of a heating water pipe, a third port of the third three-way valve is connected with an inlet of a cold water tank through a pipeline, a water outlet of the heating water pipe and an outlet of the cold water tank converge into an inlet of the first water branch, and the heating water pipe is used for heating the air outlet pipe;
the control system is also used for controlling the opening of the third three-way valve according to the temperature detected by the temperature sensor so as to control the proportion of water flowing to the heating water pipe and the cold water tank.
6. The underground engineering variable air volume fresh air dehumidification system according to claim 1, wherein an outlet of the second water branch is connected with a water inlet of a cooling water pipe, a water outlet of the cooling water pipe is connected with an inlet of the second water branch, and the cooling water pipe is used for cooling electric appliances in the system.
7. A control method of the underground engineering variable air volume fresh air dehumidifying system as claimed in any one of claims 1 to 3 or any one of claims 5 to 6, wherein the control method comprises:
acquiring the current operation air volume detected by the air volume sensor;
determining a control strategy according to the current operation air volume;
and controlling the opening and closing of each electric closed air valve and each dehumidifier according to the control strategy.
8. The control method of the underground engineering variable air volume fresh air dehumidification system as claimed in claim 4, wherein the determination method of the control strategy comprises:
when the current operation air volume is more than 200003H is not more than 300003When the air volume of the dehumidifier is 1/3 of the current operation air volume, the control strategy is to control the three electric closed air valves to be in an open state and control the three dehumidifiers to operate;
when the current running air volume is more than 100003H is not more than 200003When the air volume is larger than the preset air volume, the control strategy is to control two of the three electric closed air valves to be in an open state and control the corresponding two dehumidifiers to operate, and the operation air volume of each dehumidifier is 1/2 of the current operation air volume;
when the current running air volume is more than or equal to 30003H is 10000 or less3And when the air volume is larger than the preset air volume, controlling one of the three electric closed air valves to be in an open state and controlling the corresponding dehumidifier to operate according to the control strategy, wherein the operation air volume of the dehumidifier is the current operation air volume.
9. The method for controlling an underground engineering variable air volume fresh air dehumidifying system according to claim 7, wherein the total operating time of each dehumidifier is counted, when a new operating dehumidifier is required, the dehumidifier with the shortest total operating time in the dehumidifiers in the off state is selected to be turned on, and when the operating dehumidifier is required to be turned off, the dehumidifier with the longest total operating time in the dehumidifiers in the operating state is selected to be turned off.
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| CN111998441A (en) * | 2020-07-14 | 2020-11-27 | 中国人民解放军63653部队 | Humidity control device and control method for large-volume closed granite cavern |
| CN113587410B (en) * | 2021-07-13 | 2022-11-18 | 无锡地铁集团有限公司 | Air quantity measuring device, subway air conditioning system and control method |
| TWI819912B (en) * | 2022-11-30 | 2023-10-21 | 台灣松下電器股份有限公司 | Dehumidifier static pressure adjustment method and dehumidifier system |
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| US6826920B2 (en) * | 2002-12-09 | 2004-12-07 | Honeywell International Inc. | Humidity controller |
| KR20160112095A (en) * | 2015-03-17 | 2016-09-28 | 주식회사 경동나비엔 | Variable air ventilation diffuser for dehumidifying cooling device and dehumidifying cooling system using the same |
| CN205065990U (en) * | 2015-10-16 | 2016-03-02 | 浙江欧伦电气有限公司 | Dehumidification system is concentrated in frequency conversion |
| CN205065989U (en) * | 2015-10-16 | 2016-03-02 | 浙江欧伦电气有限公司 | Dehumidification system is concentrated to new trend |
| CN205403007U (en) * | 2016-03-02 | 2016-07-27 | 广州市兆晶电子科技有限公司 | Digital vortex variable -air -volume system |
| CN206361808U (en) * | 2016-09-29 | 2017-07-28 | 殷晓冬 | The weak turbulent air cleaning system of adjustable cleanliness factor and apply its operating room |
| CN206257751U (en) * | 2016-11-23 | 2017-06-16 | 浙江欧伦电气有限公司 | A kind of energy-saving fresh air dehumidifier |
| CN109959093A (en) * | 2019-03-27 | 2019-07-02 | 中国北方车辆研究所 | A kind of fresh air treatment system for multiple climate cells |
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