Natural ventilation systems are usually difficult to control, fluctuate based on external conditions, are often subject to reversal, and can vary seasonally.
Seasonal changes can significantly impact an underground mine’s mechanical ventilation system due to variations in temperature, barometric pressure and humidity. Generally, underground mines are relatively stable in temperature compared to surface conditions. However, seasonal changes can still affect the mine’s microclimate.
During winter, when surface temperatures drop, the air entering the mine tends to be colder. Cold air is denser and heavier which can affect the distribution and flow of air within the mine and might lead to a change in airflow patterns.
Seasonal variations can also alter barometric pressure which can affect airflow direction and speed within the mine. High-pressure systems in colder months may increase the airflow into the mine, while low-pressure systems in warmer months may decrease airflow. These pressure changes can impact the efficiency of the ventilation system, potentially causing imbalances and affecting air quality.
In an underground mine, changes in humidity levels can impact the stability of the mine’s walls and surfaces, including creating slick conditions. Higher humidity can lead to moisture accumulation, which in turn, might affect the ventilation system’s components, such as fans, ducts and airways. Moisture can cause corrosion and degradation which can lead to decreased system efficiency or even mechanical failures.
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Reference:
https://www.ontario.ca/page/ventilation-systems-mines-and-mining-plants
