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한화택(Hwataik Han),정영균(Young Kyun Jeong),이성환(Sung Hwan Yi) 한국실내환경학회 2009 한국실내환경학회지 Vol.6 No.2
In this paper, it is intended to investigate the condensation characteristics of a supply vent cap, which is designed and developed for natural ventilation systems for ondol heating spaces. Numerical simulations are conducted using a CFD package to analyze airflow and thermal conditions around the vent cap. Temperature and humidity distributions are obtained to predict condensation on the surface, depending on the material properties. As the thermal conductivity decreases, decreased is the condensation surface area. The thermal conductivity of the vent cap is found to be less than 1 W/mK in order to prevent condensation under the winter design condition of Seoul. An experimental technique is introduced to visualize condensation on surfaces using water-absorbing mud film. Analytical results are in good agreement with experimental observations. Discussion are also included for the thermal comfort and flow characteristics around the vent cap observed by the flow visualization and temperature visualization studies.