Air conditioning system for subway station

Abstract

The invention provides an air conditioning system for a subway station, and the air conditioning system is based on a central air conditioning system, and air sensors which are arranged outside, inside and inside a main blast pipe, and an air return system. And secondary dynamic closed-loop feedback regulation is carried out on the air state of each area in the air pipe and the subway through an electric variable air valve, a central air conditioning system water chilling unit, a fresh air fan and an air return system which are arranged at an air outlet. Compared with a traditional variable air volume control system, the air conditioning system of the subway station has the advantages of being high in response speed, rapid in air conditioning, capable of achieving intelligent remote linkage control and capable of automatically adjusting the air state of the subway station. The whole system is efficient and convenient to operate and maintain, and manpower and material resource cost of system maintenance can be greatly reduced.

Description

Technical Field

[0001] The technical solution provided in this application belongs to the field of ventilation and cooling control in subway stations or large venues, and specifically relates to an air conditioning system for subway stations. Background Art

[0002] Large venues like subway stations and train stations typically utilize large central air conditioning systems for centralized ventilation, cooling, and heating. This system typically requires a system of main air ducts, branch air ducts, and return air ducts to distribute fresh air to every corner of the venue. However, efficiently and intelligently distributing air volume to every corner has been a key technical challenge that has attracted significant attention from air conditioning manufacturers.

[0003] Currently, the variable air volume control system used in the central air conditioning system of subway stations has at least the following problems:

[0004] 1. Low system intelligence: Traditional variable air volume valves currently use manual adjustment, mechanical feedback mechanisms, or electric switches. Their intelligence level is clearly insufficient. This results in the potential for energy conservation and comfort in the air conditioning system's routing process being untapped, failing to meet the requirements for energy conservation, environmental protection, comfort, and adjustability.

[0005] 2. The perception of environmental changes is not sensitive enough, and the air volume cannot be automatically adjusted in time: Existing central air-conditioning systems usually only use sensors to sense the air conditions outside the environment (temperature, humidity, oxygen content, etc.), and then adjust the operating parameters of the air-conditioning system according to the set adjustment parameters. However, there is a lack of a feedback linkage mechanism between the air conditions inside the air-conditioning duct and the ambient air conditions, and the air-conditioning operating status cannot be adaptively adjusted in time according to changes in the external environment.

[0006] 3. Poor user experience with air conditioning: Existing central air conditioning systems typically use manual or centralized control for dampers. This centralized control mechanism results in uneven airflow, often leading to uneven cooling and heating, as well as uneven oxygen levels (especially in high-traffic public areas), resulting in a poor user experience. Summary of the Invention

[0007] Based on the aforementioned shortcomings of existing central air conditioning systems for large venues, this application provides an air conditioning system for subway stations. This air conditioning system provides the hardware necessary for energy-saving optimization of air conditioning control systems, offering a keen sense of environmental changes, timely feedback, and rapid adjustment execution. It also boasts excellent air volume control, efficient, convenient, and simple system operation and maintenance, and low energy and environmental costs.

[0008] The air conditioning system for subway stations provided in this application includes: a central control module, several outdoor air sensor groups, several indoor air sensor groups, an air sensor group in the air duct, a central air conditioning system, a main air duct, a branch air duct, and an electric air variable valve on the air outlet of each branch air duct.

[0009] Among them, the central control module senses the outdoor air state parameters in real time through several of the outdoor sensor groups, calculates the air state adjustment parameters in the main air supply duct at one time according to the real-time state of the outdoor air, and sends them to the central air-conditioning system as the current main air duct air state adjustment parameters.

[0010] The duct air conditioning system of the central air conditioning system cyclically obtains the air state parameters in the total air duct through the air sensor group in the air duct, and based on the difference between the air state parameters in the total air duct and the current total air duct air state adjustment parameters, the duct air conditioning actuator of the central air conditioning system is closed-loop feedback adjusted to ensure that the difference is within a preset first range.

[0011] The central control module obtains the measured air state parameters of each area in the subway station through the multiple indoor air sensor groups, and periodically calculates the difference between the air state setting parameters of each area in the subway station and the corresponding measured air state parameters; when the difference between any air state setting parameter and the corresponding measured parameter in each area in the subway station is greater than the corresponding preset range, the wind pressure value / air volume value of the branch air duct outlet in each area in the subway station is calculated, and the opening of the electric variable air valve on the branch air duct outlet is adjusted through closed-loop feedback until the difference between each measured air state parameter and the corresponding air state setting parameter in each area in the subway station is within the corresponding preset range.

[0012] This air conditioning system triggers closed-loop regulation of the air within the central air conditioning main duct based on changes in outdoor air conditions. This system then adjusts the opening of the dampers at each air outlet in a closed-loop manner based on real-time changes in air conditions in each indoor zone. The entire system is highly responsive to indoor and outdoor air conditions, providing rapid feedback and operating autonomously without human intervention.

[0013] Furthermore, the duct air conditioning actuator includes: a central air conditioning system's fresh air fan, exhaust fan, and chiller. The central air conditioning system's fresh air fan and the return air system's exhaust fan are synchronously controlled. The outdoor air sensor group, indoor air sensor group, and duct air sensor group all include: a temperature sensor, a humidity sensor, a wind pressure sensor, and an oxygen content detector. Accordingly, the outdoor air state parameters, the air state setpoints for each area within the subway station, and the air state parameters within the main air duct all include temperature, humidity, air volume, and oxygen content.

[0014] Furthermore, the temperature sensors, humidity sensors, and oxygen content detectors in the indoor air sensor group are installed in the return air systems of various areas within the subway station, allowing the central control module to obtain the actual measured parameters of the air status in each area of the subway station. The wind pressure sensors in the indoor air sensor group are installed at the outlets of the branch air ducts corresponding to each area of the subway station, allowing the central control module to obtain the air volume and pressure at each outlet. Based on the measured air volume and pressure values obtained by the wind pressure sensors at each outlet, the central control module performs feedback adjustment on the opening of the electric variable air valve at each outlet, ensuring that the air volume and pressure at each outlet remain at the set value.

[0015] The air conditioning system provided in this application uses sensors to sense the air conditions indoors, outdoors, and within the main air duct in real time, and performs closed-loop feedback regulation on the central air conditioning system's fresh air blower, chiller, and return air system. Closed-loop feedback regulation is also performed on the opening angle of the electric variable air valves at each air outlet to ensure the dynamic balance of the air supply system. The air conditioning system is sensitive to changes / fluctuations in ambient air conditions and, based on a two-layer feedback regulation mechanism, dynamically balances the air supply system in a timely manner, enabling rapid regulation or balancing of changes or fluctuations in ambient air conditions. Furthermore, the air conditioning system's configuration equipment can be configured with fault self-detection and fault alarm functions to enable remote alarm prompts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of the system composition of an air conditioning system provided in this application in one embodiment. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0019] like Figure 1In the illustrated embodiment, the air conditioning system 100 provided herein includes: a central control module 1, an outdoor air sensor group 21, an indoor air sensor group 22, an air duct air sensor group 23, a central air conditioning system 3, a main air duct 4, a branch air duct 5, and an electric air damper 6 at the outlet of each branch air duct. The number of outdoor air sensors 21 and indoor air sensor groups 22 can be set according to actual needs. The central control module 1 can be a control room or a control computer. The central air conditioning system 3 includes components required for air conditioning, such as a chiller, an exhaust system (including an exhaust fan), and a fresh air fan.

[0020] Among them, the central control module 1 senses the outdoor air state parameters in real time through several outdoor sensor groups, and calculates the air state adjustment parameters in the main air duct 4 (supply air) at one time based on the real-time state of the outdoor air and the air state setting values of each area in the subway station, and sends them to the central air conditioning system 3 as the current main air duct air state adjustment parameters. The algorithm for calculating the air state adjustment parameters in the main air duct 4 usually requires complex calculations based on the actual measured values of the outdoor air state and the air state setting values of each area in the subway station. The corresponding algorithm can also be a statistical relationship obtained based on experience, which will not be elaborated here.

[0021] The duct air conditioning system of the central air conditioning system 3 cyclically obtains the total duct air state parameters via the duct air sensors 23. Based on the difference between the total duct air state parameters and the current total duct air state adjustment parameters, the duct air conditioning actuators of the central air conditioning system 3 are closed-loop feedback-adjusted to ensure that the difference is within a preset first range. Specifically, the operation of the duct air conditioning actuators is feedback-adjusted based on the real-time monitoring data from the duct air sensors 23 until the actual measured air state value in the total duct 4 reaches and remains at the current total duct air state adjustment parameters (within the allowable error range).

[0022] Furthermore, the fresh air fan of the central air conditioning system 3 and the exhaust fan of the return air system are synchronously controlled. This not only helps maintain the positive / negative pressure balance in the room, ensures that the supply and return air flow rates match, and avoids airflow short-circuiting or system pressure fluctuations; it also helps dynamically respond to load changes, reduces system energy consumption through variable frequency regulation, and improves air handling efficiency.

[0023] The central control module 1 obtains the measured air state parameters of each area in the subway station through the plurality of indoor air sensor groups 22, and periodically calculates the difference between the air state setting parameters of each area in the subway station and the corresponding measured air state parameters. When the difference between any air state setting parameter and the corresponding measured parameter in each area of the subway station is greater than the corresponding preset range, the wind pressure value / air volume value of the air outlet of the branch air duct 5 in each area of the subway station is calculated, and the opening of the electric variable air valve 6 on the air outlet of each branch air duct 5 is adjusted through closed-loop feedback until the difference between each measured air state parameter and the corresponding air state setting parameter in each area of the subway station is within the corresponding preset range. That is, based on the measured air state value of each area in the subway station, the opening of the electric air valve 6 on the air outlet of each branch air duct 5 is fed back until the measured air state value of each area in the subway station is the corresponding air state setting parameter (within the allowable error range).

[0024] Furthermore, the outdoor air sensor group 21, indoor air sensor group 22, and air duct sensor group 23 each include a temperature sensor, a humidity sensor, a wind pressure sensor, and an oxygen content detector. Accordingly, the outdoor air state parameters, the air state setpoints for each area within the subway station, and the air state parameters within the main air duct all include temperature, humidity, air volume, and oxygen content.

[0025] The temperature sensor, humidity sensor, and oxygen content detector in the indoor air sensor group 22 are installed in the return air system of each area in the subway station (for example, installed at the return air duct or in the return air duct), so that the central control module 1 can obtain the actual measured parameters of the air state in each area of the subway station. The wind pressure sensor in the indoor air sensor group 22 is installed at the branch air duct outlet corresponding to each area in the subway station, so that the central control module 1 can obtain the air volume / air pressure at the outlet of each branch air duct 5. Based on the actual measured air volume / air pressure values obtained by the wind pressure sensors at each air outlet, the central control module 1 performs feedback adjustment on the opening of the electric variable air valve 6 on the outlet of each branch air duct 5, so that the air volume / air pressure at the outlet of each branch air duct 5 is maintained at the set value. When changes in the air volume / pressure at the outlet of each branch air duct 5 are detected, the fluctuation value of the air volume / pressure is fed back to the central control module 1 in real time through the air pressure sensor of the indoor air sensor group 22; the central control module 1 intelligently or manually determines the wind balance state and calculates the difference with the set value so as to adjust the opening of the electric variable air valve 6 according to the obtained difference; this process is repeated until the air volume / pressure at the outlet of each branch air duct 5 is maintained at the set value.

[0026] Preferably, the opening of the electric variable air valve 6 at the farthest air outlet is dynamically maintained between 80% and 90% to reduce the resistance of the entire system; the opening of other electric variable air valves 6 is adjusted by the system according to the air volume / air pressure of each air outlet. The central control module 1 monitors the opening of each electric variable air valve 6 in real time. If the opening of the most unfavorable electric variable air valve 6 in the system (generally the farthest end) is less than the first preset value (such as less than 80%), it means that the current static pressure is too high and the static pressure setting value can be lowered; if the most unfavorable electric variable air valve 6 in the system is close to fully open (such as more than 90%), the static pressure setting value needs to be increased to avoid insufficient air supply. When the system is running, keeping the electric variable air valve 6 as open as possible (between 80% and 90%) can minimize the air outlet resistance; when the air supply demand decreases, it is preferred to close some electric variable air valves 6 instead of reducing their valve openings.

[0027] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An air conditioning system for a subway station, characterized in that: The air conditioning system includes: a central control module, a plurality of outdoor air sensor groups, a plurality of indoor air sensor groups, an air duct air sensor group, a central air conditioning system, a main air duct, a branch air duct and an electric air variable valve on the air outlet of each branch air duct; The central control module senses outdoor air state parameters in real time through the plurality of outdoor sensor groups, calculates the air state adjustment parameters in the main air supply duct in one go based on the real-time outdoor air state, and sends the calculated air state adjustment parameters to the central air conditioning system as the current main air duct air state adjustment parameters; The duct air conditioning system of the central air conditioning system cyclically obtains the total duct air state parameter through the duct air sensor group, and based on the difference between the total duct air state parameter and the current total duct air state adjustment parameter, the duct air conditioning actuator of the central air conditioning system is adjusted through closed-loop feedback to ensure that the difference is within a preset first range; The central control module obtains the measured air state parameters of each area in the subway station through the multiple indoor air sensor groups, and periodically calculates the difference between the air state setting parameters of each area in the subway station and the corresponding measured air state parameters; when the difference between any air state setting parameter and the corresponding measured parameter in each area in the subway station is greater than the corresponding preset range, the wind pressure value / air volume value of the branch air duct outlet in each area in the subway station is calculated, and the opening of the electric variable air valve on the branch air duct outlet is adjusted through closed-loop feedback until the difference between each measured air state parameter and the corresponding air state setting parameter in each area in the subway station is within the corresponding preset range.

2. The air conditioning system according to claim 1, wherein: The fresh air fan of the central air-conditioning system and the exhaust fan of the return air system are synchronously controlled.

3. The air conditioning system according to claim 1, wherein: The outdoor air sensor group, the indoor air sensor group and the air duct air sensor group all include: a temperature sensor, a humidity sensor, a wind pressure sensor and an oxygen content detector.

4. The air conditioning system according to claim 3, wherein: The outdoor air state parameters, the air state setting values of each area in the subway station, and the air state parameters in the main air duct respectively include: temperature, humidity, air volume, and oxygen content.

5. The air conditioning system according to claim 2, wherein: The air duct air conditioning actuator includes: a fresh air fan, an exhaust fan and a chiller unit of a central air conditioning system.

6. The air conditioning system according to claim 4, wherein: The temperature sensor, humidity sensor and oxygen content detector in the indoor air sensor group are set in the return air system of each area in the subway station, so that the central control module can obtain the actual measured parameters of the air status in each area in the subway station.

7. The air conditioning system according to claim 3 or 6, characterized in that: The wind pressure sensors in the internal air sensor group are arranged at the branch air duct outlets corresponding to each area in the subway station, so that the central control module can obtain the air volume / air pressure of each air outlet; the central control module performs feedback adjustment on the opening of the electric variable air valve on each air outlet based on the actual measured values of the air volume / air pressure obtained by the wind pressure sensors of each air outlet, so that the air volume / air pressure of each air outlet is maintained at the set value.

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