Does subway station rely on Dehumidifier to maintain air humidity balance
The subway station is generally located below the low plane, with poor air circulation and extensive moisture sources. If improperly handled, the wall will be dewed, the ground will be wet or even ponding, laying hidden dangers for personnel circulation, equipment operation and subway traffic. Therefore, special Dehumidifier needs to be used for dehumidification to keep the subway station in a relatively dry environment.
1、 Wet source analysis
Dehumidifier is relatively good for dehumidification. The factors of humidity in the subway mainly include personnel moisture dissipation, equipment moisture dissipation, moisture dissipation and condensation on the wet surface, moisture brought in by the outside air, moisture from the enclosure structure, etc. Therefore, the composition of the heat and humidity load in subway stations is very complex, mainly including heat and humidity transfer of the enclosure structure, heat generation of train transportation and equipment, heat and humidity load of air exchange at entrances and exits, outdoor fresh air load, heat generation of station equipment and lighting, heat dissipation and moisture dissipation of station personnel, etc. The heat and humidity load of the interval tunnel mainly includes the transfer structure, train operation and equipment heating, air exchange heat and humidity load at the tunnel entrance, tunnel equipment and lighting heating, etc.
The wall condensation that people often see in the subway without Dehumidifier, when the outdoor hot and humid air enters the subway station with lower temperature and contacts the inner wall of the subway, if the wall temperature is higher than the air dew point, there will be no condensation; if the wall temperature is lower than the air dew point temperature, there will be condensation on the wall. After more condensation, water will form and flow to the ground. Causing dampness on walls, floors, etc., affecting passengers' walking.
2、 Solution
To solve the problem of heat and humidity in subway stations, in addition to installing ventilation and air conditioning systems, a dehumidification system suitable for the project should also be configured. Ventilation systems such as air conditioning can alleviate indoor humidity issues, but they cannot fundamentally solve them. Therefore, it is necessary to configure a professional dehumidification system to be used in conjunction with it.
The advantage of the professional Dehumidifier is that it can directly convert the excess water in the indoor air into water and discharge it out of the room through the drainage pipeline. It is a direct humidity control method and can intelligently control the air humidity in the station. Maintain relative humidity in an ideal environment. The scheme design of the Dehumidifier shall be calculated according to the humidity load in the subway station, such as the size of the site, the size of the Dedicated outdoor air system, and the flow of personnel. Direct indoor dehumidification can be used, as well as fresh air dehumidification or return air dehumidification schemes.
3、 Dehumidifier equipment
At present, conventional industrial Dehumidifier and pipeline industrial Dehumidifier are the main dehumidifiers that can be used for the dehumidification system in subway stations. The conventional industrial Dehumidifier is a vertical Dehumidifier, which is simple to install and convenient to use. It can be directly placed indoors to circulate the indoor air. The advantages of the Dehumidifier are low input cost, good dehumidification effect, and the disadvantages are that it occupies an area. Pipe type industrial Dehumidifier can be used together with air conditioning system. The advantage of using the ventilation ducts of the air conditioning system for fresh air dehumidification or return air dehumidification indoors is that it can be installed outdoors, saves indoor space, and is easy to manage. The disadvantage is that the investment cost is high.
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