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In case 2, it seems that the air flow caused by the hot plume in the upper zone and the air flow caused by supply air in the lower zone are 'totally' separated

CFD simulation on the air flow in a sauna

BUILDING RESEARCH AND INFORMATION, no. 6 (2007): 307-312

Cited by: 1|Views19
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Abstract

Sauna is the Finnish word for a wood-lined and insulated room, heated by a special stove containing stones, and erected specifically to create the right environment for a certain kind of dry bath. Its fundamental purpose is to induce perspiration and thus to cleanse the skin and body. The authors have now applied scientific data to the my...More

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Introduction
  • Sauna is apart ofFinnish culture which has brought the Finns andtheir visitors both excellent feelings and good health.
  • The mechanism ofthe sauna seemsto be nottotally understood even until now.
  • Aikas and Holmberg [1] conducted a laboratory test on a sauna andproduced some useful results.
  • Itis afact that within the Finnish sauna the airtemperature istypically, in therange of 60-100°C.
  • In order to geta closer look at sauna, ithas been decided touse the CFD technique to find outmore details concerning airflow within asauna
Highlights
  • Sauna is apart ofFinnish culture which has brought the Finns andtheir visitors both excellent feelings and good health
  • From the foregoing simulation and analysis, it has been found that the position of the air inlet has a great influence on the air flow and temperature distribution within the sauna
  • If a more even temperature distribution in the sauna is desired, it would be better to deliver the fresh air into the sauna from a high level
  • It is evident that the buoyancy force of the relatively cold fresh air provides resistance against the upward hot plume when air is supplied into the space at a high level
  • In case 2, it seems that the air flow caused by the hot plume in the upper zone and the air flow caused by supply air in the lower zone are 'totally' separated
Results
  • In considering the foregoing analysis, it has been found that the radiant heat emission from the stove takes about 73 % of the total heat output.
Conclusion
  • From the foregoing simulation and analysis, it has been found that the position of the air inlet has a great influence on the air flow and temperature distribution within the sauna.
  • Defining lower surface temperature in relation to the lower side walls for case 1 and higher surface temperature for case 2 creates better agreement between the calculated and measured temperature distribution
  • This consequence cannot be explained by the current research.
  • The temperature gradient near the floor in case 2 can be negative
  • This may be explained by the combination of radiant heat exchange with hot upper sauna surfaces and convective heat transfer with cold fresh air nearby
Tables
  • Table1: Temperature for each region in the simplified sauna model
  • Table2: Boundary conditions
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Funding
  • In considering the foregoing analysis, it has been found that the radiant heat emission from the stove takes about 73 % of the total heat output
Reference
  • Äikäs E. and Holmberg R. (1992) Saunan lämpötilat ja ilmanvaihto (Temperature and ventilation of sauna). VTT report No. 1431.
    Google ScholarFindings
  • Lemaire T. (1990) User manual of WISH. TNO-Institute of Applied Physics.
    Google ScholarFindings
  • Heikkinen J. (1991) Modelling of a supply air terminal for room air. Twelfth AIVC Conference, Vol. 3.
    Google ScholarLocate open access versionFindings
  • Chen Q.Y. (1988) Indoor airflow, air quality and energy consumption of buildings. Ph.D. Thesis, Delft Technical University.
    Google ScholarFindings
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