Metro air conditioning ventilation system monitors ambient temperature and air humidity to produce a temperature and humidity sensor
With the development of urban transportation, the subway plays an increasingly important role in people's lives. The subway is also the preferred transportation mode for short-distance travel because of its fast, convenient and comfortable features. Compared with other ground transportation, because the subway is in the underground space, the overall ventilation is poor and the ventilation is poor, and the flow rate is large. Therefore, it is especially important to control the temperature and humidity and ventilation conditions in the station under suitable conditions.
Due to factors such as temperature, humidity, ventilation and fire safety of the subway, the subway is usually equipped with an air conditioning ventilation system. Currently, the most commonly used is the screen door system. In this system, the temperature and humidity of the environment are usually monitored by the temperature and humidity sensor, and the data is fed back to the control center and the control terminal issues commands to control the working conditions of the air conditioning temperature control and ventilation equipment in the station. The control center can judge the flow rate and air condition of the station according to the data sent back by the temperature and humidity sensor. When the flow rate is high and the temperature is high, the operating frequency and time of the air conditioning system are appropriately increased and extended, and the flow rate is low. During the time slot or platform, it is not necessary to turn on the temperature and ventilation equipment for a long time. Through the monitoring of the ambient temperature and humidity by the temperature and humidity sensor, and reasonable control of the working state of the air conditioning ventilation system related equipment, not only can ensure the comfortable environmental condition of the subway station, but also avoid energy waste, and play the role of energy saving.
Honeywell's HIH6131-021 temperature and humidity sensor is a digital output relative humidity (RH) and temperature sensor combined in the same package. The product has the advantages of precision and high long-term stability. The same type of humidity sensor needs to undergo a 12-hour 75% RH rehydration process (which needs to be done in a special equipment room) to correct the reflow temperature drift. Honeywell sensors also experience temperature drift after reflow, however, it only requires 5 hours of rehydration at room temperature ("50% RH"), the new Honeywell HI6131-021 temperature and humidity sensor Laser-corrected, thermoset polymer capacitive sensing elements are used. The multi-layer construction of the components protects against most application hazards such as condensation, dirt, dust, oil and common environmental chemicals, helping to provide industry-leading stability and reliability.
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