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Temperature and ventilation of the Finnish sauna

Authors
  • Äikäs, Erkki
  • Holmberg, Rolf
Publication Date
1992
Source
VTT Publications Register
Keywords
License
Unknown
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Abstract

Measurements were taken in a sauna in order to study how the positions of the air inlets and outlets affect the temperature distribution and the functioning of the ventilation. The distribution of humidity when throwing water on the stove in a sauna was also measured. The sauna was equipped with mechanical exhaust air ventilation. A good mixing of the air in the sauna is a prerequisite for an even vertical temperature distribution. In practice, air which is colder than the sauna air tends to flow downwards. In a bathing situation, air of normal room temperature is cold and flows down towards the sauna floor unless it is forced to mix with the air circulating in the sauna. During cold winter days the phenomenon is even more prevalent unless the inlet air is heated. In order to prevent the formation of a cold air zone in the lower part of the sauna, the inlet air must be supplied above the stove, where it is mixed with circulating sauna air. In this way, the effect of steam from water thrown on the stove also reaches the lower part of the sauna. The mixing of air from the upper part of the sauna with air from the lower part is further increased by placing the air outlet in the lower part of the sauna. Insulating the floor also increases the warming of the lower part of the sauna.

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