The Second Skin Facades can be an useful tool for increasing the efficient use of natural ventilation in order to decrease the energy consumption for ventilation and cooling purposes and to increase the indoor thermal comfort levels. To analyze this type of facades a simulation is set up. The simulation is carried out with the simulation code Simulink.
With the purpose of evaluating validity of the application of CFO on the problems of cross-ventilation, numerical simulation was performed, using standard k- E model and two types of modified k-E models which improve evaluation accuracy in production term of turbulence energy, and also using LES, and the results were compared with those of the corresponding wind tunnel experiment. As a result, it was found that the defects of the model characteristic to the standard k- E model could be improved to a certain extent by application of the modified models.
Using the wind pressure difference method to estimate the cross ventilation potentials of a building at a particular site, the appropriate wind frequency data at the building site are important (Aynsley et al, 1977, Su, 2001). This study investigated wind frequency data available from the data recording site at Auckland airport and discusses how to obtain the building site wind frequency data from the original wind frequency data recorded from such sources.
A new research project in the Building Research Institute aims at developing a quantitative tool for cross ventilation design for buildings. One of the approaches adopted in the project is the experiment in the wind tunnel, where a full-size cubical building model can be used at this stage. In this paper, mainly the first observation result for the building model without openings is shown and discussed.
The paper presents the results of a study into the effects of unsteady wind pressures on the mean flow rates in certain types of purpose-designed naturally ventilated buildings. The study used non dimensional parameters and the results should therefore cover a wide range of conditions and should be of general application. It is concluded that unsteady) effects are restricted to a relatively narrow band of conditions. These conditions have been quantified in terms of non dimensional parameters.
Airflow and thermal stratifications solutions in a single-zone building with buoyancy-driven ventilation are derived. Two new 'empty air-filling box' models are developed, and it is shown that the fully-mixed model overpredicts the clean zone height an