A STUDY OF FLOOR PLANNING IN DESIGNATED REFUGE FLOOR IN HIGH-RISE BUILDING
Authors: Lu, Weizhen ; Lo, S M; Fang, Z ; Yuen, K K
The Hong Kong Fire Code stipulates to provide designated refuge floors for high-rise or ultra high-rise
buildings. In order to fulfill its function, the refuge floor should be a temporally safe place for the evacuees
during evacuation under fire case. The safety of refuge floor under fire situation may be impaired if the floor is
affected by smoke from lower levels. The code prescribes that cross-ventilation should be provided in refuge
floor so as to prevent smoke logging. However, suspicions of the adequacy of such measure are raised. A study
on the floor planning inside the refuge floor will provide some insight on airflow and smoke dispersion patterns.
In this paper, the Computational Fluid Dynamics (CFD) method is applied to analyze the airflow field around
and inside a refuge floor under different floor settings within a high-rise building. The investigation involves the
application of two turbulence models, i.e., the standard k-ε model and the RNG k-ε model. The study shows that
floor planning could affect the air movement and further the smoke dispersion in refuge floor.