Fog forms in mine ramps when warm and humid exhaust air moves upwards the ramp and temperature decreases. As fogging is a fairly common problem, many different fog removal alternatives are known. For example, heating, cooling, scrubbing, chemically drying the air, and increasing air velocity are used to remove fog. In this study fogging problems of some Finnish mines are reviewed. Furthermore, possible fog removal methods are compared to identify most feasible and sensible solutions. The most common fog removal methods in subarctic countries are air heating and increasing air velocity, so the main interest is directed for comparison of these methods. In cases where there have already been attempts for fog removal, user experiences of the used fog removal methods are presented. To enable comparison of the methods tests were conducted and measurements taken. Results of the comparison indicate that increasing air velocity by air rerouting is not a satisfactory fog removal method. Installing an additional fan to increase the air velocity yielded better results, but calculations showed that the resulting changes in temperature and humidity are directly proportional with the heating capacity of the fan. Best fog removal results were achieved with air heaters.
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