English

Many of the dedicated outdoor air systems designed and installed today are suboptimal. The aim of this paper is to discuss the ways to optimize their design in order to lower both their installed cost and energy use.

The aim of this study was to develop a theoretical method to calculate the effectiveness of Indirect Evaporative Cooling (IEC) with condensation from primary airflow.For this study, a set of analytical equations has been developed , to calculate precisely the overall performance through a specified procedure for the complicated IEC process.The theoretical results have been validated by the performance of an experimental test

To vent or not to vent attics or roofs is a design and construction choice, not a requirement determined by physics or by building codes. In this paper the advantages and drawbacks of venting or unventing are presented :Vented attic/roofs designs work best with airtight ceiling interfaces and when air handlers and ductwork are not within attic spaces.Unvented attic/roofs designs have the advantage of providing conditioned spaces for air handlers and ductwork. But they require different approaches in different climate locations.

Until recently the health community lacked a coherent, and compehensive dataset describing the extent and distribution of ill-health.Thanks to the Global Burden of Disease (GBD) database, updated yearly since 1996, a broad set of additional analyses can be done : 200 causes of death and illness by age and sex, separately for 14 regions of the world have been delineated.In 2000, the World Health Organization (WHO) has brought together about 100 specialists from 30 institutions worldwide to conduct a first large-scale multi-risk-factor Comparative Risk Assessment (CRA) exercice.Since all the

For that study, two types of air terminal devices for a personalized ventilation (PV) system in conjunction with either a mixing or a displacement total-volume ventilation system were installed in a mock-up of an office. The performances of those PV systems were studied in regard to inhaled air quality and thermal comfort as well as the transport of pollution within the occupied zone and between occupants.

That study about the development of new convection correlations for rooms with cooled ceiling (CC) panels has two main objectives : - to develop convection correlations for the CC surfaces in rooms with only natural ventilation. - to quantify the influence of the high aspiration diffuser on convection at cooled ceiling surfaces as well as at other wall and floor surfaces.

The first part of this paper is a presentation of a simple method using commercial CFD software to obtain the solution multiplicity characteristics of laminar and turbulent indoor airflows.A two-zone naturally ventilated building with four openings is considered in that study. Nonlinear dynamic behaviors are analyzed. Different flow modes were identified with the same physical and boundary conditions. A multi-zone airflow and thermal coupled program was also used to evaluate the results.That theroretical analysis can help to properly design natural ventilation in real buildings.

The aim of that study was to evaluate the environment's thermal conditions so as to indentify the comfort and localized discomfort conditions in office buildings with underfloor air supply systems.Parameters of thermal comfort and of system operation are presented in this paper. The results of that research show that thermal conditions created by the underfloor air supply system fulfill the thermal comfort requirements and can be used as a guideline for air-conditioning systems with underfloor air supply designs.

The influence of three airflows (constant airflow, simulated natural airflow and sinusoidal airflow) on thermal comfort was studied in this paper.Their different fluctuation characteristics were used to conduct experiments on human thermal response in two different temperature environments, neutral-warm (30C) and cool-neutral (26C) environments. The method and results are presented.

From the epidemiological point of view, the main pathway to infection spread is airborne transport. The droplet size is the most important factor affecting their dispersion and deposition on surfaces, it determines the survival of microorganisms within the droplets.
This paper is a review of the state of knowledge concerning mechanisms of droplet spread and the solutions available to minimize their spreading and thus to prevent infections.