English

Pressure coefficients are considered vital components for the calculation of airflow through opening in building.The experimental investigation consisted of a square wind catcher connected to a model test room. At various wind speeds and four different wind directions between 0-45 at interval of 15, the pressure coefficients distribution, the internal air speed and the volumetric airflow were measured.The results obtained using Explicit, AIDA Implicit model and CFX code appeared in adequacy with the experimental results at lower speeds and with wind incidents at angle of 0-15 .

The conflict between the quality of subway environment and energy consumption is becoming more and more serious. For that study, the subway thermal environment simulation software (STESS) has been used for the simulation and prediction of the long-term (month by month) and short term (hour by hour) changes in subway thermal environment.
The relationship between ventilation scheme, thermal simulation scheme with the air conditioning load of each station and the whole year energy consumption of the full line is specially discussed in this paper.

Axial fan ventilation system has been investigated in an automative parts factory, during summer. 54 axial were installed on ceiling. For the estimation of the improvement of working environment of the automotive parts manufacturing factory with the axial fan, the distribution of air velocity and temperature are investigated by experimental method. Besides, the surface temperature of the ceiling and windows is measured by thermal camera to investigate the thermal stratification.

For that study, four ventilation strategies have been evaluated in a typical bedroom in a residential building in Singapore : night-time ventilation only, daytime ventilation only, full day ventilation and no ventilation. The impacts of facade on indoor thermal environment have been analyzed too. The results are presented.

A good performance of air diffuser is essential for an efficient ventilation and thermal comfort. Because of the Coanda effect and the influence of buoyancy, conventional diffusers cannot introduce effectively the warm air into the occupied zone in winter. So, thermodynamic diffusers have been designed to solve that problem. Both experimental and numerical models have been built, and their performances have been compared with the conventional ones.

The authors have tested a combined system of chilled ceiling, displacement ventilation and dessicant dehumidification. Each part is analyzed with its advantages and shortcomings. It appears that the combination of the three parts are consistent on cooling source demand and complementary on indoor comfort.
Their conclusion is that a better Comfort, IAQ and energy saving can be achieved with the association of the three technologies.

This paper presents a numerical method for the study of cross-ventilation with respect to the use of local dynamic similarity model. That model is a ventilation model which predicts the discharge coefficient and the inflow angle at the opening of a cross-ventilated building. Results indicate that the flow rate either calculated directly by CFD or using the local dynamic similarity model is acceptable.

For that study, surveys were first performed to study the relationship between indoor temperature and air conditioner On control. Then, a control behavior model including cross ventilation, based on the survey results was devised. Finally, the results simulated with that method were compared to those with the typical method.

In California, the relocatable classrooms are typically under ventilated : such conditions affect the quality education and the student health. The authors are developing a new HVAC system addressing the problems of noise and energy inefficiency. A prototype was operated in a relocatable classroom test-bed to characterize its performances. Then during one year, ten of the new HVAC systems are being monitored in parallel with the current standard HVAC systems in four schools in Northern and Southern California.

The distributions of air velocity, temperature and humidity are affected by the types and shapes of diffusers for supply air in an occupied zone. So it is important to select proper diffusers in the design procedure of the HVAC systems. The aim of that study is to propose a selection guide for a proper line diffuser in a room when perimetric heating load exists.