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Building and environment v.114, 2017년, pp.445 - 454   SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Theoretical and experimental study of departure duration of condensate droplets from radiant cooling ceiling surfaces

Tang, Haida (Department of Building Science, Tsinghua University, Beijing 100084, China ); Zhang, Tao ( Department of Building Science, Tsinghua University, Beijing 100084, China ); Liu, Xiaohua ( Department of Building Science, Tsinghua University, Beijing 100084, China ); Jiang, Yi ( Department of Building Science, Tsinghua University, Beijing 100084, China );
  • 초록  

    Abstract In this paper, a mathematical model for predicting the departure duration of the first condensate droplet from a radiant ceiling surface was proposed on the basis of the condensation water mass. The simulation results indicate a dependence of condensation water mass on the apparent contact angle of the substrate, but almost in no relation with the surface temperature. The condensation water mass firstly increases with the increase of the apparent contact angle. It reaches a maximum weight of 522?g/m 2 at an apparent contact angle of 110°, and then decreases. A visualization experiment of condensation on a radiant ceiling panel with a conventional aluminum alloy surface was performed in a climate chamber to measure the departure duration of the droplet. The measured departure duration fluctuates due to the variance of apparent contact angle and the randomness of condensation process, but it decreases sharply with the sub-cooled degree (air dew point minus surface temperature). And the average departure duration is 10?h with a sub-cooled degree of 5?°C. The theoretical model is validated as the average relative biases between the experimental and theoretical results are within 25%. Highlights Departure duration of condensate droplets from radiant cooling ceiling was studied. A model was developed to predict droplet departure duration and condensation mass. The effect of the contact angle on departure duration was investigated theoretically. Measured departure duration fluctuates but it decreases with the sub-cooled degree.


  • 주제어

    Radiant cooling ceiling .   Condensation .   Condensate droplet departure duration .   Condensation water mass .   Contact angle.  

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