Intelligent ventilation system based on working condition environment

Abstract

The application discloses an intelligent ventilation system based on working conditions, adopts two sets of ventilation equipment respectively for independent spaces and public spaces, adjusts and correlates through public space ventilation, balances the heat of each independent space and the public area in the closed space, reduces the additional heat convection caused by the sudden connection of the independent space and the public area, and simultaneously, the whole temperature and control quality are more stable, the independent spaces are individually adjusted according to the characteristics of the independent spaces, and the ventilation blind area caused by the central air distribution mode of the temperature control system is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of subway ventilation systems, in particular to an intelligent ventilation system based on working condition environment. BACKGROUND

[0002] In recent years, with the acceleration of subway construction, the cumulative length of subway operation lines in China has also been growing, reaching 8012.85 kilometers by 2022. This has resulted in a large number of existing subway stations. Subway stations, as enclosed underground spaces, are extremely important for air exchange and temperature exchange inside.

[0003] Due to the presence of independent enclosed space structures in the subway station environment, and the common presence of equipment storage and operation space characteristics with heat generation characteristics. This leads to the problem of strong heat convection when the independent space and the public space are connected, which is difficult to solve effectively under the condition of centralized temperature control. At the same time, as an underground environment, the structure of the subway station bears more stress than the conventional building structure, and unbalanced temperature control and ventilation environment will cause expansion of materials such as concrete with large thermal deformation, and accelerate the aging of the building structure. At the same time, central air distribution is difficult to effectively solve the problem of some air circulation blind areas.

[0004] The distributed structure of the prior art is a technical means to solve this problem, but such technology mainly considers end use requirements, which leads to instability of the temperature control and air control state of the public space as other transit space. Especially when adjusting the time span and environmental span, the air control state is inevitably affected by external environmental conditions, making the overall system difficult to effectively unify the use effect in terms of time span and environmental span.

[0005] There is a need for an intelligent ventilation system based on working condition environment to solve the above problems. SUMMARY

[0006] The present application is to solve the problem that the existing distributed structure of the prior art is a technical means to solve this problem, but such technology mainly considers end use requirements, which leads to instability of the temperature control and air control state of the public space as other transit space. Especially when adjusting the time span and environmental span, the air control state is inevitably affected by external environmental conditions, making the overall system difficult to effectively unify the use effect in terms of time span and environmental span. The present application provides an intelligent ventilation system based on working condition environment, which adopts a correlation distributed ventilation control method to solve the above problems.

[0007] The application provides an intelligent ventilation system based on working condition environment, comprising a pair of global ventilation devices, a public area, an independent area, a plurality of independent area heat exchange devices, a plurality of independent area air exchange devices, a controller, a people flow statistical device, a clock, a temperature and humidity sensor and a carbon dioxide sensor, the public area is a peripheral closed space, the global ventilation devices are arranged at opposite ends of the public area, the independent area is in closed communication with the public area, the independent area heat exchange devices and the independent area air exchange devices are in communication with the public area and the independent area through valve assemblies, the people flow statistical device is arranged at an entrance position and an exit position of the public area, the temperature and humidity sensor is arranged in the public area, in each independent area and at the periphery of the public area, the carbon dioxide sensor is arranged in the public area and in each independent area, and the clock, the global ventilation devices, the independent area heat exchange devices, the independent area air exchange devices, the people flow statistical device, the temperature and humidity sensor and the carbon dioxide sensor are all signal-connected with the controller.

[0008] The global ventilation devices are used for controlling air circulation and heat exchange between the public area and the outside world according to a time table, people flow, temperature and humidity and carbon dioxide concentration, the independent area heat exchange devices are used for controlling heat exchange between the public area and the independent area according to a time table, temperature and humidity and carbon dioxide concentration, the independent area air exchange devices are used for controlling air exchange between the public area and the independent area according to a time table, temperature and humidity and carbon dioxide concentration, the temperature and humidity sensor is used for detecting temperature and humidity at each position, the carbon dioxide sensor is used for detecting carbon dioxide concentration at each position, the people flow statistical device is used for counting people flow in the public area, the clock is used for generating a time table, and the controller is used for controlling air exchange between the public area and the outside world and between the public area and the independent area based on the obtained time table, people flow, temperature and humidity and carbon dioxide concentration.

[0009] The controller controls the air and heat exchange of the public area and the independent area in the following manner:

[0010] SA1, determining whether the current independent area type is a device room, if yes, proceeding to step SA2, otherwise, proceeding to step SA7;

[0011] SA2, determining whether the average temperature Tr of the device room is greater than 28℃, if yes, proceeding to step SA3, otherwise, proceeding to step SA2;

[0012] SA3, the controller obtains a time table through the clock, and determines whether the time table date is in a first date section, if yes, proceeding to step SA4, otherwise, proceeding to step SA5;

[0013] SA4, determining whether the time table date is in a second date section, if yes, adjusting the opening angle of the valve assembly to a first angle, then opening the independent area air exchange device and proceeding to step SA6, otherwise, adjusting the opening angle of the valve assembly to a second angle, then opening the independent area air exchange device and proceeding to step SA6.

[0014] SA5, if the time table date is in the third date section or the fourth date section, then the opening angle of the valve assembly is adjusted to the third angle, and the independent region heat exchange device is opened, otherwise, step SA17 is performed;

[0015] SA6, if the current average temperature Tr is less than 17℃, then step SA17 is performed, otherwise, step SA6 is performed;

[0016] SA7, if the current independent region is a substation, then step SA8 is performed, otherwise, step SA13 is performed;

[0017] SA8, if the current average temperature Tr in the room is greater than 36℃, then step SA9 is performed, otherwise, step SA8 is performed;

[0018] SA9, the time table is obtained according to the clock, and it is judged whether the current date belongs to the first date section, if yes, step SA10 is performed, otherwise, step SA11 is performed;

[0019] SA10, the low-speed mode of the direct-flow ventilation of the independent region air exchange device is started, and then SA12 is performed;

[0020] SA11, the high-speed mode of the direct-flow ventilation of the independent region air exchange device is started, and then SA12 is performed;

[0021] SA12, if the current average temperature Tr in the room is less than 26.3℃, then step SA17 is performed, otherwise, step SA12 is performed;

[0022] SA13, the independent region enthalpy Ir and the public region enthalpy Iw are calculated according to the collected air temperature and the unit mass dry air humidity content of the independent region and the public region, and the calculation formula of the enthalpy I is as follows:

[0023] I = 1.006t + w(2501 + 1.86t);

[0024] Wherein t represents the air temperature, and w represents the unit mass dry air humidity content;

[0025] SA14, if the current carbon dioxide concentration CP of the independent region is greater than or equal to 0.1%, then the independent region air exchange device is opened, and then step SA16 is performed, otherwise, step SA15 is performed;

[0026] SA15, if the public region enthalpy Iw is greater than the independent region enthalpy Ir, then the independent region air exchange device is opened, and then step SA16 is performed, otherwise, step SA14 is performed;

[0027] SA16, judging whether the enthalpy Iw of the public area is less than or equal to the enthalpy Ir of the independent area and whether the carbon dioxide concentration CP of the current independent area is less than or equal to 0.1%, if yes, proceeding to step SA17, otherwise proceeding to step SA16;

[0028] SA17, closing the current ventilation device.

[0029] The controller controls the air and heat exchange between the public area and the outside in the following manner:

[0030] SB1, judging whether the current date is the fifth date segment, if yes, proceeding to step SB2, otherwise proceeding to step SB7;

[0031] SB2, judging whether the temperature difference between the public area and the outside is less than or equal to 5℃ and the temperature of the public area is less than 30℃, if yes, closing the reversible heat exhaust fan and the corresponding air valve of the global ventilation device, opening the bypass air valve and proceeding to step SB11, otherwise proceeding to step SB3;

[0032] SB3, judging whether the total time exceeds the annual coefficient Y according to the time table obtained by the clock, if yes, proceeding to SB4, otherwise setting the global ventilation device to mechanical exhaust and proceeding to step SB5;

[0033] SB4, judging whether the current temperature Tc of the public area is greater than the first temperature threshold and whether the outside temperature To is less than or equal to the second temperature threshold, if yes, proceeding to step SB5, otherwise setting the global ventilation device to piston ventilation;

[0034] SB5, calculating the enthalpy Iw of the public area and the threshold Io of the outside respectively, if the enthalpy Iw of the public area is greater than the threshold Io of the outside, proceeding to step SB6, otherwise proceeding to step SB4;

[0035] SB6, judging whether the enthalpy Iw of the public area is greater than the threshold Io of the outside for the first threshold judgment time Ti, if yes, proceeding to step SB11, otherwise proceeding to step SB4;

[0036] SB7, collecting the time flow distribution according to the people flow statistical device and the clock;

[0037] SB8, judging whether the public area people flow belongs to the peak according to the time flow distribution, if yes, proceeding to step SB9, otherwise proceeding to step SB10;

[0038] SB9, setting the heat exhaust fan and the fresh air fan to pre-start and proceeding to step SB11;

[0039] SB10, setting the heat exhaust fan to pre-start and proceeding to step SB11;

[0040] SB11, starting the global ventilation device.

[0041] The intelligent ventilation system based on working condition environment, as a preferred mode, the global ventilation device includes reversible heat exhaust fan and fresh air fan, and the global ventilation device completes air and heat exchange through mutually independent air supply duct, exhaust duct and piston air duct in the public area.

[0042] The intelligent ventilation system based on working condition environment, as a preferred mode, the entering number and the leaving number of the time people flow distribution are calculated respectively.

[0043] The intelligent ventilation system based on working condition environment, as a preferred mode, the judgment method of whether the public area people flow belongs to peak is:

[0044] The entering number and the leaving number are taken as the ordinate and fitted into spline curves according to the time axis abscissa respectively, whether there is a curve interval in the spline curve that conforms to the normal distribution characteristics is judged, if yes, the time period is marked as a peak period, otherwise, whether there is a time period that is greater than the basic people flow threshold value is compared, if yes, the time period is marked as a peak, otherwise, no marking is performed.

[0045] The intelligent ventilation system based on working condition environment, as a preferred mode, the first date section, the second date section, the third date section, the fourth date section and the fifth date section are date serial numbers, the second date section is a non-end date section within the first date section, the third date section and the fourth date section are date sections located at the two endpoints of the first date section and not coinciding with the first date section, and the fifth date section and the first date section add up to a whole year.

[0046] The intelligent ventilation system based on working condition environment, as a preferred mode, the third angle is greater than the first angle which is greater than the second angle.

[0047] The intelligent ventilation system based on working condition environment, as a preferred mode, the independent area includes equipment room, substation room, ordinary room, ventilation machine room, personnel room and water room.

[0048] The intelligent ventilation system based on working condition environment, as a preferred mode, the water room does not take in air and only exhausts when starting the independent area air exchange device.

[0049] The beneficial effects of the present application are as follows:

[0050] (1) The system realizes more uniform heat distribution and effectively reduces the operation time of the ventilation system by two sets of ventilation methods that are associated with each other.

[0051] (2) The system connects two sets of dynamic balance ventilation systems through the public area, so that the heat of each independent space in the closed space and the public area is relatively balanced, the sudden connection of the independent space and the public area reduces the additional heat convection, the overall temperature and control quality are more stable, and each independent space is adjusted according to the characteristics of each independent space;

[0052] (3) The system is dynamically adjusted based on the environmental dimension and the time dimension, so that the ventilation environment in the closed environment is always in a relatively balanced state, and the temperature and ventilation environment in the closed space are closer to the ideal homogenization model;

[0053] (4) The dynamic balance mode of the system effectively avoids the emergence of the ventilation blind area in the closed space, so that the building structure provided with the ventilation system is in a more stable temperature control state, and the aging risk is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 It is a layout schematic diagram of an intelligent ventilation system based on working condition environment;

[0055] Figure 2 It is a flow chart of the air and heat exchange mode of the public area and the independent area of an intelligent ventilation system based on working condition environment;

[0056] Figure 3 It is a flow chart of the air and heat exchange mode of the public area and the outside environment of an intelligent ventilation system based on working condition environment.

[0057] REFERENCE SIGNS:

[0058] 1, global ventilation device; 2, public area; 3, independent area; 3, independent area heat exchange device; 5, independent area air exchange device; 6, controller; 7, people flow statistical device; 8, clock; 9, temperature and humidity sensor; 10, carbon dioxide sensor. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Embodiment 1

[0060] As Figure 1As shown, an intelligent ventilation system based on working environment, comprising a pair of global ventilation device 1, public area 2, independent area 3, a plurality of independent area heat exchange device 4, a plurality of independent area air exchange device 5, controller 6, people flow statistical device 7, clock 8, temperature and humidity sensor 9 and carbon dioxide sensor 10, the public area 2 is the outer periphery of the closed space, the global ventilation device 1 is arranged at the opposite ends of the public area 2, the independent area 3 is closedly connected with the public area, the independent area heat exchange device 4 and the independent area air exchange device 5 are connected with the public area 2 and the independent area 3 through the valve assembly, the people flow statistical device 7 is arranged at the entrance and exit positions of the public area 2, the temperature and humidity sensor 9 is arranged in the public area 2, each independent area 3 and the outer periphery of the public area 2, the carbon dioxide sensor 10 is arranged in the public area 2 and each independent area 3, the clock 8, the global ventilation device, the independent area heat exchange device 4, the independent area air exchange device 5, the people flow statistical device 7, the temperature and humidity sensor 9 and the carbon dioxide sensor 10 are signal connected with the controller 6;

[0061] The global ventilation device 1 is used for controlling the air flow and heat exchange between the public area 2 and the outside according to the time table, the passenger flow, the temperature and humidity and the carbon dioxide concentration, the independent area heat exchange device 4 is used for controlling the heat exchange between the public area 2 and the independent area 3 according to the time table, the temperature and humidity and the carbon dioxide concentration, the independent area air exchange device 5 is used for controlling the air exchange between the public area 2 and the independent area 3 according to the time table, the temperature and humidity and the carbon dioxide concentration, the temperature and humidity sensor 9 is used for detecting the temperature and humidity of each position, the carbon dioxide sensor 10 is used for detecting the carbon dioxide concentration of each position, the people flow statistical device 7 is used for counting the passenger flow of the public area 2, the clock 8 is used for generating the time table, and the controller 6 is used for controlling the air exchange between the public area 2 and the outside and the public area 2 and the independent area 3 based on the obtained time table, the passenger flow, the temperature and humidity and the carbon dioxide concentration.

[0062] In the embodiment, the environment is the subway station, when the subway station executes the corresponding environment control mode according to different requirements, the subway staff such as the environment control personnel selects the mode by manual mode according to the seasonal change and the time requirement, and the switching of different modes cannot be adjusted according to the change of the on-site environment of the station, so the energy saving effect is not good, and the control optimization measure of combining the environment detection system and the ventilation and air conditioning system through the comprehensive monitoring system can collect the on-site environment data through the temperature and humidity sensor, feed back to the PLC of the environment and detection system, and upload the data to the comprehensive monitoring system in real time, so that the operation mode of the station ventilation system and the multi-connected computer system can be automatically selected and executed according to the on-site environment through the logical conversion of the comprehensive monitoring system, the clock system and the passenger flow data, so as to achieve the purpose of energy saving and emission reduction.

[0063] According to the ventilation requirement, the global ventilation device 1 is provided with a reversible heat exhaust fan at each end of the station, with a power of 110KW and a frequency converter, which can execute different working modes according to different environments, change the frequency of the frequency converter, and achieve different exhaust effects. Meanwhile, three-grade regulating valves are arranged at the boundary between the ventilation duct and the station hall and platform to adjust the exhaust volume of the station hall and platform in real time. Fresh air fans are arranged at each end of the station, with a power of 11KW, which work together with the heat exhaust fans to adjust the ventilation of the public area. The air supply duct, exhaust duct and piston duct are arranged at each end of the station.

[0064] In this embodiment, the design standard of the outdoor air calculation parameter is: public area, tunnel: summer ventilation 24.1℃, winter ventilation 3.9℃, winter heating -9.8℃; the internal design parameter standard of the subway is public area: summer ventilation 29℃, winter ventilation 12℃; the air quality standard is: the fresh air volume of each passenger in the tunnel is ≥12.6m³ / h; when the open operation of the ventilation system is used in the public area of the underground station, the fresh air volume of each passenger is ≥30m³ / h; when the closed operation of the ventilation system is used, the fresh air volume of each passenger is ≥12.6m³ / h. The daily average concentration of CO2 in the air of the public area of the underground station should be less than 0.15%.

[0065] There are 18 groups of environmental detection points arranged in the public area of the station, which are transmitted to the system through the system I / O module box, and the logic conversion of the energy-saving program is carried out through the interface between the system and the integrated monitoring system, so that the ventilation operation mode of the large system can be automatically selected and executed according to the on-site environmental parameters. The monitoring point positions arranged in the station are as follows.

[0066]

[0067] The energy-saving regulation mode can use the interface between the integrated monitoring and the AFC automatic ticket checking and selling system to collect passenger flow information data in real time, estimate the passenger flow of the station, and regulate the temperature according to the fresh air volume of each passenger and the temperature and humidity sensors and carbon dioxide sensors of the public area of the station hall and platform. The ventilation system at the two ends of the station is controlled by the same controlled object, that is, the integrated monitoring system analyzes and determines to execute different working modes according to the related parameters provided by the system.

[0068] As shown in Figure 2 The controller 6 controls the air and heat exchange of the public area 2 and the independent area 3 in the following way:

[0069] SA1, judge whether the current independent area 3 type is a device room, if yes, go to step SA2, otherwise go to step SA7;

[0070] SA2, judge whether the average temperature Tr of the device room is greater than 28℃, if yes, go to step SA3, otherwise go to step SA2;

[0071] SA3, the controller 6 obtains the time table through the clock 8, and judges whether the time table date is in the first date section, if yes, step SA4 is performed, otherwise step SA5 is performed;

[0072] SA4, it is judged whether the time table date is in the second date section, if yes, the opening angle of the valve assembly is adjusted to the first angle, the independent area air exchange device 5 is opened, and then step SA6 is performed, otherwise the opening angle of the valve assembly is adjusted to the second angle, the independent area air exchange device 5 is opened, and then step SA6 is performed;

[0073] SA5, it is judged whether the time table date is in the third date section or the fourth date section, if yes, the opening angle of the valve assembly is adjusted to the third angle, the independent area heat exchange device 4 is opened, otherwise step SA17 is performed;

[0074] SA6, it is judged whether the current average temperature Tr is less than 17℃, if yes, step SA17 is performed, otherwise step SA6 is performed;

[0075] SA7, it is judged whether the current independent area 3 is a substation, if yes, step SA8 is performed, otherwise step SA13 is performed;

[0076] SA8, it is judged whether the current average temperature Tr in the room is greater than 36℃, if yes, step SA9 is performed, otherwise step SA8 is performed;

[0077] SA9, the time table is obtained according to the clock 8, and it is judged whether the current date belongs to the first date section, if yes, step SA10 is performed, otherwise step SA11 is performed;

[0078] SA10, the low-speed mode of the direct-flow ventilation of the independent area air exchange device 5 is started, and then step SA12 is performed;

[0079] SA11, the high-speed mode of the direct-flow ventilation of the independent area air exchange device 5 is started, and then step SA12 is performed;

[0080] SA12, it is judged whether the current average temperature Tr in the room is less than 26.3℃, if yes, step SA17 is performed, otherwise step SA12 is performed;

[0081] SA13, the enthalpy Ir of the independent area 3 and the enthalpy Iw of the public area 2 are calculated according to the collected air temperature and the unit mass dry air humidity content of the independent area 3 and the public area 2, and the calculation formula of the enthalpy I is as follows:

[0082] I=1.006t+w(2501+1.86t);

[0083] Wherein t represents the air temperature, and w represents the unit mass dry air humidity content;

[0084] SA14, judging whether the carbon dioxide concentration CP of the current independent area 3 is greater than or equal to 0.1%, if yes, turning on the independent area air exchange device 5 and then performing step SA16, otherwise performing step SA15;

[0085] SA15, judging whether the enthalpy Iw of the public area 2 is greater than the enthalpy Ir of the independent area 3, if yes, turning on the independent area air exchange device 5 and then performing step SA16, otherwise performing step SA14;

[0086] SA16, judging whether the enthalpy Iw of the public area 2 is less than or equal to the enthalpy Ir of the independent area 3 and whether the carbon dioxide concentration CP of the current independent area 3 is less than or equal to 0.1%, if yes, performing step SA17, otherwise performing step SA16;

[0087] SA17, turning off the current ventilation device.

[0088] The small system ventilation system mode of the important equipment room is divided into a full fresh air system and a small fresh air system. Since the small system adopts a fixed frequency design, the adjustment mode is mainly to realize energy-saving control by adjusting the three-grade adjustment valve at the initial end of the fan and the opening angle of the valve. The average temperature value of each equipment room is calculated.

[0089] Correspondingly, in the embodiment, the first date section is from November 16 to March 31 of the next year, the second date section is from December 1 to February 28 of the next year, and the third and fourth date sections correspond to each year from October 16 to November 15 and from April 1 to April 29 of the next year, respectively.

[0090] Specifically, in the embodiment, the small fresh air mode is started from November 16 of each year to March 31 of the next year. From November 16 to November 30 of each year and from March 1 to March 31, the opening angle of the valve is adjusted to 70%. From December 1 of each year to February 28 of the next year, the opening angle of the valve is adjusted to 40%. Meanwhile, when the average temperature Tr of the civil communication equipment room, the public security communication equipment room and the communication equipment room is greater than 28℃, the mode is started, and when the average temperature Tr is less than 17℃, the mode is stopped. The full fresh air mode is started from October 16 of each year to November 15 and from April 1 to April 29 of the next year. The opening angle of the valve is 100%. Meanwhile, when the average temperature Tr of the civil communication equipment room, the public security communication equipment room and the communication equipment room is greater than 28℃, the mode is started, and when the average temperature Tr is less than 17℃, the mode is stopped.

[0091] The substation direct current ventilation mode is started and stopped according to the indoor temperature throughout the year. When the average temperature Tr in the room is greater than 36℃, the mode is started, and when the average temperature Tr in the room is less than 26.3℃, the mode is stopped. From November 5 of each year to March 31 of the next year, the double-speed fan low-speed mode is started, and the high-speed mode is started at other times.

[0092] The mode execution of the general room ventilation, the ventilation fan room ventilation, the personnel room air supply, the bathroom, the sewage pump room ventilation, and the auxiliary fire pump room ventilation is controlled according to the comparison result of the outdoor air enthalpy (Iw) and the indoor air enthalpy (Ir) or the concentration (CP) of the air CO2 in the room, and according to the design parameters, the minimum air intake and the exhaust air volume of each room are set, and the air exchange parameters in each room are as follows.

[0093]

[0094] The air exchange parameter table of each room

[0095] Further, the t and w of the indoor and outdoor and the CP can be obtained by the temperature and humidity sensor and the carbon dioxide sensor in the environment detection and control system.

[0096] On this basis, the comprehensive monitoring system analyzes the data uploaded to the system every 10 minutes, such as Tr, Iw, Ir and CP, and issues the corresponding working condition mode of the ventilation and air conditioning system in the environmental control system. In order to improve the stability of the control and prevent the repeated switching of various working condition modes, the calculation results of Tr and Iw need to be compared continuously for 10 times and the results need to be consistent. In addition, when the CO2 concentration in the room exceeds 0.1%, the corresponding room ventilation working condition mode is executed.

[0097] As shown in Figure 3 The controller 6 controls the air and heat exchange between the public area 2 and the outside in the following manner:

[0098] SB1, whether the current date is the fifth date section, if yes, proceed to step SB2, otherwise proceed to step SB7;

[0099] SB2, whether the temperature difference between the public area 2 and the outside is less than or equal to 5℃ and the temperature of the public area 2 is less than 30℃, if yes, the reversible heat exhaust fan and the corresponding air valve of the global ventilation device 1 are closed, and the bypass air valve is opened, then proceed to step SB11, otherwise proceed to step SB3;

[0100] SB3, according to the time table obtained by the clock 8, whether the total time exceeds the annual coefficient Y, if yes, proceed to SB4, otherwise set the global ventilation device 1 to mechanical exhaust and proceed to step SB5;

[0101] SB4, whether the current temperature Tc of the public area 2 is greater than the first temperature threshold and whether the outside temperature To is less than or equal to the second temperature threshold, if yes, proceed to step SB5, otherwise set the global ventilation device 1 to piston ventilation;

[0102] SB5, the enthalpy value Iw of the public area 2 and the threshold value Io of the outside world are calculated respectively, if the enthalpy value Iw of the public area 2 is greater than the threshold value Io of the outside world, step SB6 is performed, otherwise step SB4 is performed;

[0103] SB6, it is judged whether the enthalpy value Iw of the public area 2 is greater than the threshold value Io of the outside world for a first threshold value judgment time Ti, if yes, step SB11 is performed, otherwise step SB4 is performed;

[0104] SB7, the distribution of the passenger flow at the time is collected according to the passenger flow counting device 7 and the clock 8,

[0105] SB8, it is judged whether the passenger flow of the public area 2 belongs to the peak according to the distribution of the passenger flow at the time, if yes, step SB9 is performed, otherwise step SB10 is performed;

[0106] SB9, the exhaust air fan and the fresh air fan are set to be pre-started, and then step SB11 is performed;

[0107] SB10, the exhaust air fan is set to be pre-started, and then step SB11 is performed;

[0108] SB11, the global ventilation device 1 is started.

[0109] Further, the embodiment realizes global adjustment through phased control on the basis of the technical scheme, and the specific mode is as follows:

[0110] From April 1 to November 4 every year, the exhaust air condition or the piston ventilation mode is executed, when the temperature Tc of the public area in the station is greater than 26 DEG C, the outdoor temperature To is less than or equal to 31 DEG C, and the enthalpy calculation time satisfies 30 min, the exhaust air condition mode is started, in the mode, the frequency converter parameter of the exhaust air fan at both ends of the station is set to 35 HZ; when the temperature Tc of the public area is greater than 28 DEG C, the outdoor temperature To is less than or equal to 31 DEG C, and the enthalpy calculation time satisfies 30 min, the exhaust air condition mode is started, in the mode, the frequency converter parameter of the exhaust air fan at both ends of the station is set to 42 HZ; when the temperature Tc of the public area is greater than 29 DEG C, the outdoor temperature To is less than or equal to 31 DEG C, and the enthalpy calculation time satisfies 30 min, the exhaust air condition mode is started, in the mode, the frequency converter parameter of the exhaust air fan at both ends of the station is set to 50 HZ; when the exhaust air condition is started, two exhaust air fans are started, the corresponding interlocking combination air valve is opened, and all the electric air volume regulating valves in the exhaust air system of the large system are opened to a preset angle, the hot air in the station is exhausted to the outdoor through the exhaust air duct and the piston air duct, the fresh air is naturally supplemented by the entrance and exit, and the purpose of reducing the environmental temperature is achieved. In order to ensure the stability of the system operation and prevent the frequent switching of the modes of each system, the inertial running time of each execution of the corresponding condition mode is not less than 2 h.

[0111] During the peak time period from November 5th to March 31st of the next year, the closed operation mode is started, and the winter closed operation (open fresh air machine) mode is executed. In this mode, two fresh air machines TAF / A and TAF / B and the corresponding interlocking air valves are opened, and the remaining devices remain in the zero state, so as to ensure that the platform public area meets the requirements.

[0112] The judgment method of whether the public area 2 passenger flow belongs to the peak is as follows:

[0113] The entering and leaving numbers are taken as the vertical coordinates, and the spline curve is fitted according to the time axis horizontal axis, so as to judge whether there is a curve interval in the spline curve that meets the normal distribution characteristics. If yes, the time period is marked as the peak period, otherwise, the vertical coordinate value of the spline curve is compared with the basic passenger flow threshold value. If yes, the time period is marked as the peak, otherwise, no marking is performed.

[0114] The passenger flow peak period is determined based on the AFC automatic ticketing system data, and the passenger flow statistics of the intelligent edge door system of each station and each entrance. Due to the influence of different lines, different stations, up and down lines, weekdays and weekends and other factors, the urban rail transit station has different passenger flow spatial distribution characteristics. At the same time, due to the different locations of the subway stations, the passenger travel time is also different, and the passenger flow of different stations is also different.

[0115] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An intelligent ventilation system based on working conditions, characterized in that: The system includes a pair of global ventilation devices (1), a public area (2), an independent area (3), several independent area heat exchange devices (4), several independent area air exchange devices (5), a controller (6), a people counting device (7), a clock (8), a temperature and humidity sensor (9), and a carbon dioxide sensor (10). The public area (2) is an enclosed space. The global ventilation devices (1) are located at opposite ends of the public area (2). The independent areas (3) are connected to the public area in a closed manner. The independent area heat exchange devices (4) and the independent area air exchange devices (5) are connected to the public area (2) and the independent areas through a valve assembly. In the public area (2), the people flow counting device (7) is located at the entrance and exit of the public area (2), the temperature and humidity sensor (9) is located in the public area (2), in each of the independent areas (3) and on the periphery of the public area (2), the carbon dioxide sensor (10) is located in the public area (2) and in each of the independent areas (3), and the clock (8), the global ventilation device, the independent area heat exchange device (4), the independent area air exchange device (5), the people flow counting device (7), the temperature and humidity sensor (9) and the carbon dioxide sensor (10) are all connected to the controller (6) via signals. The global ventilation device (1) is used to control the air circulation and heat exchange between the public area (2) and the outside world according to the timetable, traffic flow, temperature and humidity and carbon dioxide concentration. The independent area heat exchange device (4) is used to control the heat exchange between the public area (2) and the independent area (3) according to the timetable, temperature and humidity and carbon dioxide concentration. The independent area air exchange device (5) is used to control the air exchange between the public area (2) and the independent area (3) according to the timetable, temperature and humidity and carbon dioxide concentration. The temperature and humidity sensor (9) is used to detect the temperature and humidity at each location. The carbon dioxide sensor (10) is used to detect the carbon dioxide concentration at each location. The traffic flow counting device (7) is used to count the traffic flow in the public area (2). The clock (8) is used to generate the timetable. The controller (6) is used to control the air exchange between the public area (2) and the outside world and between the public area (2) and the independent area (3) based on the acquired timetable, traffic flow, temperature and humidity and carbon dioxide concentration. The controller (6) controls the air and heat exchange in the public area (2) and the independent area (3) in the following manner: SA1. Determine whether the current independent area (3) is a device room. If yes, proceed to step SA2; otherwise, proceed to step SA7. SA2. Determine whether the average temperature Tr of the equipment room is greater than 28°C. If yes, proceed to step SA3; otherwise, proceed to step SA2. SA3. The controller (6) obtains the timetable through the clock (8) and determines that the date of the timetable is in the first date segment. If so, proceed to step SA4; otherwise, proceed to step SA5. SA4. Determine whether the date on the timetable is in the second date range. If yes, adjust the opening angle of the valve assembly to the first angle and then open the independent area air exchange device (5) before proceeding to step SA6. Otherwise, adjust the opening angle of the valve assembly to the second angle and then open the independent area air exchange device (5) before proceeding to step SA6. SA5. Determine whether the date on the timetable is in the third or fourth date segment. If yes, adjust the opening angle of the valve assembly to the third angle and then open the independent area heat exchange device (4). Otherwise, proceed to step SA17. SA6. Determine if the current average temperature Tr is less than 17℃. If yes, proceed to step SA17; otherwise, proceed to step SA6. SA7. Determine whether the current independent area (3) is a substation. If yes, proceed to step SA8; otherwise, proceed to SA13. SA8. Determine whether the current average room temperature Tr is greater than 36℃. If yes, proceed to step SA9; otherwise, proceed to step SA8. SA9. Obtain the timetable according to the clock (8), and determine whether the current date belongs to the first date segment. If yes, proceed to step SA10; otherwise, proceed to step SA11. SA10, After starting the low-speed mode of DC ventilation of the independent area air exchange device (5), proceed to SA12; SA11, After starting the high-speed mode of DC ventilation of the independent area air exchange device (5), proceed to SA12; SA12. Determine whether the current average room temperature Tr is less than 26.3℃. If yes, proceed to step SA17; otherwise, proceed to step SA12. SA13. Calculate the enthalpy Ir of the independent region (3) and the enthalpy Iw of the common region (2) based on the collected air temperature and moisture content per unit mass of the independent region (3) and the common region (2). The formula for calculating the enthalpy Ir is as follows: I = 1.006t + w(2501 + 1.86t); Where t represents air temperature, w represents the moisture content per unit mass of dry air; SA14. Determine whether the carbon dioxide concentration CP of the current independent area (3) is greater than or equal to 0.1%. If yes, turn on the air exchange device (5) of the independent area and proceed to step SA16. Otherwise, proceed to step SA15. SA15. Determine whether the enthalpy value Iw of the public area (2) is greater than the enthalpy value Ir of the independent area (3). If yes, turn on the air exchange device (5) of the independent area and proceed to step SA16; otherwise, proceed to step SA14. SA16. Determine whether the enthalpy Iw of the common area (2) is less than or equal to the enthalpy Ir of the independent area (3) and whether the carbon dioxide concentration CP of the current independent area (3) is less than or equal to 0.1%. If yes, proceed to step SA17; otherwise, proceed to step SA16. SA17. Turn off the current ventilation system; The controller (6) controls the air and heat exchange between the public area (2) and the outside in the following way: SB1. Is the current date in the fifth date range? If yes, proceed to step SB2; otherwise, proceed to step SB7. SB2. Determine whether the temperature difference between the public area (2) and the outside temperature is less than or equal to 5°C and the temperature of the public area (2) is less than 30°C. If yes, the global ventilation device (1) shuts off the reversible exhaust fan and the corresponding air valve, opens the bypass air valve, and proceeds to step SB11. Otherwise, proceed to step SB3. SB3. Based on the timetable obtained from the clock (8), determine whether the total time exceeds the annual coefficient Y. If yes, proceed to SB4; otherwise, set the global ventilation device (1) to mechanical exhaust and proceed to step SB5. SB4. Determine whether the temperature Tc of the current public area (2) is greater than the first temperature threshold and whether the outside temperature To is less than or equal to the second temperature threshold. If yes, proceed to step SB5; otherwise, set the global ventilation device (1) to piston ventilation. SB5. Calculate the enthalpy value Iw of the common region (2) and the external threshold Io respectively. If the enthalpy value Iw of the common region (2) is greater than the external threshold Io, proceed to step SB6; otherwise, proceed to step SB4. SB6. Determine whether the enthalpy value Iw of the public area (2) is greater than the external threshold Io for the first threshold judgment time Ti. If yes, proceed to step SB11; otherwise, proceed to step SB4. SB7. Based on the pedestrian flow statistics device (7) and the clock (8), collect the pedestrian flow distribution at any given time. SB8. Based on the pedestrian flow distribution at the time, determine whether the pedestrian flow in the public area (2) is at its peak. If yes, proceed to step SB9; otherwise, proceed to step SB10. SB9. Set the exhaust fan and fresh air fan to pre-start before proceeding to step SB11; SB10, Set the exhaust fan to pre-start before proceeding to step SB11; SB11. Start the global ventilation device (1).

2. The intelligent ventilation system based on working conditions according to claim 1, characterized in that: The global ventilation device (1) includes a reversible exhaust fan and a fresh air fan. The global ventilation device (1) completes air and heat exchange in the public area (2) through independent air supply ducts, exhaust ducts and piston ducts.

3. The intelligent ventilation system based on working conditions according to claim 1, characterized in that: The number of people entering and leaving at the given time point is calculated separately.

4. The intelligent ventilation system based on working conditions according to claim 3, characterized in that: The method for determining whether the pedestrian flow in the public area (2) is at its peak is as follows: Using the number of people entering and leaving as the vertical axis, spline curves are fitted to the time axis and horizontal axis respectively. It is determined whether there is a curve interval in the spline curve that conforms to the characteristics of a normal distribution. If so, this period is marked as a peak period. Otherwise, it is compared with the vertical coordinate value of the spline curve to see if there is a period that is greater than the basic population flow threshold. If so, this period is marked as a peak. Otherwise, no marking is made.

5. The intelligent ventilation system based on working conditions according to claim 1, characterized in that: The first date segment, the second date segment, the third date segment, the fourth date segment, and the fifth date segment are all date ordinal numbers. The second date segment is a non-endpoint date segment within the range of the first date segment. The third date segment and the fourth date segment are date segments located at the two ends of the first date segment that do not overlap with the first date segment. The fifth date segment and the first date segment are added together to form a whole year.

6. The intelligent ventilation system based on working conditions according to claim 1, characterized in that: The third angle is greater than the first angle, which is greater than the second angle.

7. The intelligent ventilation system based on working conditions according to claim 1, characterized in that: The independent area (3) includes equipment rooms, substation rooms, general rooms, ventilation rooms, personnel rooms and water-filled rooms.

8. The intelligent ventilation system based on working conditions according to claim 7, characterized in that: When the independent area air exchange device (5) in the water-filled room is activated, it does not take in air but only exhausts air.

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