This paper presents a detailed parametric analysis of the impact geometrical characteristics wind catchers on their flow features to enhance effectiveness cross-ventilation strategies buildings. The following are evaluated in detail: (i) ceiling tilt angle, (ii) radius outer-corner bend, (iii) leeward-side (iv) straight inlet extension length, (v) nozzle-shaped radius, and (vi) inner-corner ben...

the state of works of art exhibited inside museums can be strongly influenced by indoor air quality, due to chemical activity of gaseous pollutants and particulate matter. for that reason it is important to carry out periodic air quality controls to check if the concentration levels of air pollutants comply with the limits specified by the national laws. in this work we show results obtained i...

Many models exist in the scientific literature for determining indoor daylighting values. They are classified in three categories: numerical, simplified and empirical models. Nevertheless, each of these categories of models are not convenient for every application. Indeed, the numerical model requires high calculation time; conditions of use of the simplified models are limited, and experimenta...

Human health hazards can exist in swine confinement buildings due to poor indoor air quality (IAQ). During this study, airborne dust and ammonia concentrations were monitored within a working farrowing facility as indicators of IAQ. The purposes of this study were to assess the temporal variability of the airborne dust and ammonia levels over both a daily and seasonal basis, and to determine th...

OBJECTIVE To test whether the incidence of common colds among college students in China is associated with ventilation rates and crowdedness in dormitories. METHODS In Phase I of the study, a cross-sectional study, 3712 students living in 1569 dorm rooms in 13 buildings responded to a questionnaire about incidence and duration of common colds in the previous 12 months. In Phase II, air temper...

Understanding Indoor Airflow Patterns (IAPs) helps control air contaminants in large naturally ventilated buildings (NVBs). However, the effect of random and unpredictable changes outdoor wind conditions (OWC) is a major contributor to variation IAPs NVBs, making IAP uncontrollable. This study presents results field measurements numerical simulation NBV characteristic under dynamical OWC. The O...

In addition to low-level windshear (below 1600 feet), low-level turbulence could also adversely affect arriving/departing aircraft at the airport. Turbulent airflow may occur in clear-air/non-rainy weather conditions, e.g. terrain effect at the Hong Kong International Airport (HKIA) or building’s disruptions at Haneda Airport (Tokyo International Airport) in Japan. Such airflow disturbances cou...

The implementation and application of diffused ceiling ventilation (DCV) is gradually gaining momentum, especially in Denmark, Finland, the Netherlands. In countries such as Sweden, limited despite favorable conditions for implementation. current study investigates performance DCV mixing a pre-occupancy field newly renovated classrooms Southern Sweden. Two at school were installed with diffuse ...

Background. Transmission efficacy of Influenza in aerosols is dependent on environmental factors such as temperature, relative humidity (RH), airflow, andUV-light.We studied the impact of these factors on the recovery of an aerosolized wild-type Influenza virus. Methods. Influenza Avirus (A/WS/33 H1N1) was aerosolized via nebulizer (droplet nuclei) and airbrush (droplet nuclei/droplet mix). Vir...