This paper presents the key conclusions from an extensive research project on ventilation design in animal research facilities using static microisolators. This study, which is presented in full in Memarzadeh (1998), considered both experimental and numerical aspects using the computational fluid dynamics (CFD) technique. As well as a summary of various gaseous generation rates for mice, this p...

OBJECTIVE To examine the relation between ventilation rate and occurrence of symptoms of the eyes, nose, throat, and skin as well as general symptoms such as lethargy and headache, often termed the sick building syndrome. METHODS A cross sectional population based study was carried out in 399 workers from 14 mechanically ventilated office buildings without air recirculation or humidification,...

This paper is based on research experience in radon transport. Radon in homes is a serious hcalth concern in the Tanana Valley region of Interior Alaska. The authors have much research experience in this area and arc keenly interested in radon transport and dynamics for this climatic zone. The source of radon for Interior Alaska is primarily uplands metamorphic schist bedrock, which can allow r...

In a foundry casting line, contaminants are released from a large area. Casting fumes include both volatile and particulate compounds. The volatile fraction contains hydrocarbons, whereas the particulate fraction mostly comprises a mixture of vaporized metal fumes. Casting fumes lower the air quality in foundries. The design of local ventilation for the casting area is a challenging task, becau...

Bake-out with dilution ventilation is a potential technology that can shorten emission cycle of indoor VOCs and other hazardous gas, and then reduce indoor environment pollution brought forward by building materials. This technology based on characteristic that chemical substance of building materials is easier to emit under high temperature. This paper used numerical value method to compute TV...

Ventilation aims at providing a sufficient air renewal for ensuring a good indoor air quality (IAQ), yet building energy policies are leading to adapting various ventilation strategies minimising energy losses through air renewal. A recent IAQ evaluation campaign in French dwellings shows important pollution of living spaces by VOCs such as formaldehyde, acetaldehyde or hexanal, particularly in...

are designed to circulate the air in rooms on board, usually without heat treatment or humidity. Ventilation
 systems consist of machines that provide energy for circulation (fans), main ducts connected the
 suction and exhaust fans, branches distribution components. For machinery spaces related ships,
 ventilation vital proper functioning thermal engines used as propulsion syste...

flood frequency analysis is faced with the problem of data and information limitation in arid and semi-arid regions. particularly in these regions, the length of records is usually too short to ensure reliable quantile estimates. more than 75% of iran is located in arid and semi-arid regions and despite the low annual precipitation, often large floods occur. one way to provide more information ...

Reliable measurements of air quality and emissions at large livestock buildings with inherently large spatial and temporal variations of pollutant concentrations are relatively difficult and expensive. Appropriate methodologies for such measurements are not readily apparent and techniques and strategies vary widely. Several important technical issues need to be addressed by an air pollutant emi...