English

In this study, it is a purpose to grasp the effect of natural ventilation in the apartment house. This study targeted the apartment house of 14 floors. First, we did the wind tunnel experiment that used the reproduction model, and measured the wind pressure coefficient. Next, we did CFD analysis that used k-ε model and Durbin model. We understood utility and problem of the CFD analysis by comparing the wind tunnel experiment. Consequently, analysis in windward was similar to the experiment. However, in leeward, the error margin was large.

The purpose of this research is to evaluate the indoor thermal environment under the solar shading environment. In this report, it experimented in the room to which the blind was shut to confirm the indoor thermal environment. Afterwards, the CFD analysis based on the experiment was done. And, the accuracy of the analysis was confirmed by compared with measurement results. In the experiment, it was confirmed that heat had collected in the hollow layer between the window and the blind. And, the heat leaked indoors.

In this paper, we compared measurement results with the CFD analysis results using several of modeling methods for a four-way cassette type outlet. As a result, we compiled possible phenomenon in the case of inappropriate modeling methods. For example, the influence of the Coanda effect was overestimated than measurement results when we placed the outlet to the height that was the same as a ceiling and set diagonal airflow condition.

A passive ventilation system using solar chimneys was designed to provide ventilation to several classrooms in an addition to an elementary school in Washington, DC. The primary design objectives were to provide enhanced indoor environmental quality and a learning opportunity for students. This paper explores the design process, describes obstacles faced in implementing the design, and presents the results of the simulations.

Validations of implicit large eddy simulation were carried about two wind tunnel studies, which are flow and dispersion measurements around the building. Conventional second order scheme was used in anticipation of using unstructured grid CFD code. From the first result ILES using a TVD scheme could represent an overall flow pattern around the building. From the second result, ILES using a TVD scheme could represent concentration almost within 15%.

Application of CFD (Computational Fluid Dynamics) toward performance-based building design has a long tradition. Increasingly, CFD tools are also being applied to address large-scale urban climatic questions. For instance, CFD-based analyses have the potential to provide a more detailed representation of the micro-climatic boundary conditions needed for building energy simulation. Likewise, CFD-based methods can be deployed to pursue queries pertaining to the contribution factors to the so-called Urban Heat Island effect.

This study prepares a list of articles on the CFD analyses of room air flow in the architecture field in Japan, and compiles information related to CFD analysis conditions described in each article. The discussion addresses trends in analytical conditions in Japan, the yearly transition of the number of cells, usefulness of the estimate formula for the number of cells of VDI 6019, and a rough guideline for number of cells for a low Reynolds Number model.

Natural ventilation is considered an energy efficient measure that can utilize outdoor cool air to achieve free cooling but needs not consume any fan energy. For studying the energy saving potentials of natural ventilation in factory building with design scheme, the building annual energy consumption simulation software DeST Vent+ was used to simulate the cooling load saving potential and fresh outdoor air flow rates of different area of window opening and ventilation shaft to decide the optimal design of opening area.