Measurement and Modelling of Air Flow Rate in a Naturally Ventilated Double Skin Fa©ade

摘要

Air flow rate in a naturally ventilated double skin fa(c)ade (DSF) is extremely difficult to measure due to the stochastic nature of wind,and as a consequence non-uniform and dynamic flow conditions.This paper describes the results of two different methods to measure the air flow in a full-scale outdoor test facility with a naturally ventilated double skin facade.Although both methods are difficult to use under such dynamic air flow conditions,they show reasonable agreement and can be used for experimental validation of numerical models of natural ventilation air flow in DSF.Simulations by the thermal simulation program,BSim,based on measured weather boundary conditions are compared to the measured air temperature,temperature gradient and mass flow rate in the DSF cavity.The results show that it is possible to predict the temperature distribution and airflow in the DSF although some discrepancies were found.