IBPSA2015

An HVAC circuit is a collection of interconnected elements that can be modelled by interconnected blocks. Similar to electrical or hydraulic circuits analysis, we define the HVAC network analysis as the process of finding the temperatures and humidity ratios across, and the sensible and latent heat flow rates through every component in the network for a given mass flow rate of dry air. This implies formulating and solving a system of non-linear equations.

In case of an accidental release of indoor airborne pollutants, it is critical to know information of the pollutant sources. Current inverse modeling concentrates on identifying a single pollutant source or multiple pollutant sources in simplified puff or constant release forms. This investigation proposes an inverse model to precisely identify the multiple pollutant source number, locations and their temporal release rate profiles simultaneously.

The building industry nowadays is facing two major challenges – increased concern for energy reduction and growing need for thermal comfort. These challenges have led many researchers to develop Radiant Cooling Systems that show a large potential for energy savings. This study aims to develop a personalized cooling system using the principle of radiant cooling integrated with conventional all-air system to achieve better thermal environment at the workspace. Personalized conditioning aims to create a microclimatic zone around a single workspace.

Providing an adequate quantity of fresh, clean air to occupied areas of residential and public buildings is necessary for diluting indoor CO2, airborne particles and other gas pollutant, especially for overpopulated buildings like school. The window filtration ventilator is a new idea which replacing one part of the window frame by a ventilator with filter, and it is considered suitable to improve on air quality in the classroom. However, the practical use of the new kind of ventilator in an actual room is still needed to be verified.

Double skin façades (DSF), are typically composed by two transparent envelope elements separated by a ventilated airspace. Such a technology can be applied both in new and existing buildings and may combine architectural value with energy efficiency. In the most common mechanically ventilated configurations the DSF air inlet came from the indoor environment and the outlet air returns to the HVAC system. Integrated shading devices are positioned between the skins.

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.