The effectiveness of an animal building’s ventilation system is usually characterized in terms of air exchange capacity (by measuring the air speed) and air distribution (by measuring the inlet air speed and airflow pattern). These parameters are more apt

PIV data were used to evaluate a renormalization group (RNG) k-e turbulence model of airflow in a full-scale test room (5.5 × 3.7 × 2.4 m [18.0 × 12.1 × 7.9 ft]) using FLUENT software. Three typical ventilation cases with ventilation rates of 0.12, 0.26,

Currently accepted best design practice for controlling airborne particulates in the hospital operating room relies on air flow type (laminar) and direction (down from ceiling). This is typically in the form of large arrays of laminar diffusers. These arrays are limited, or impacted, by deltaT and the need to have other ceiling-mounted equipment in the operating room. The industry could benefit from a scalable pre-engineered system that overcomes these inherent limitations. Such systems could be qualified by actual microbial testing

Experiments with a fan-driven convector used for both heating and cooling are described in this paper. Only the cooling situation is considered. The convector is positioned in the upper corner of the room, and from there the cold air is let out through the device along the ceiling. The airflow coming from the diffuser is partly controlled by the momentum flow and partly from gravity forces, where the thermal load in the room and the temperature difference between room air and supply

The issue of assessing existing buildings in terms of their vulnerability to extreme man-made intentional threats has acquired great urgency in recent years. Several federal and professional agencies, as well as individuals, have been working on this issue, and a number of analytical methods and tools have been suggested and developed. The field has reached a level of maturity where it is now necessary to synthesize existing work and define the types of specific consensus and research areas that need to be studied from the buildings perspective.

An experimental study and model analysis were performed to assess the effectiveness of commercially available in-room air cleaners in minimizing the impact of a hazardous aerosol released in a building. Two air cleaners were evaluated: a HEPA-type air cleaner and an electrostatic
precipitator.

Ever since the September 11, 2001, terrorist attacks and the subsequent anthrax incidents in the US, attempts have been being made to thwart further attacks and other forms of terrorism.Attacks involving chemical and/or biological agents (CBA) are among the most dreaded because of the ease with which they can be produced and disseminated as well as their fatal potency.Protecting buildings and built-in environments against bioterrorism or CBA attacks are key issues in homeland security.

In raised-floor data centers, the distributed air leakage, which refers to airflow through the gaps between the floor panels, reduces the amount of cooling air available for direct cooling of computer equipment. In this paper, we discuss a methodology for predicting this air leakage, using an airflow

The heat loads of servers and storage devices are continuing to increase at a rapid rate. These increases are causing data center operators to struggle with how to provide adequate cooling for these high-powered racks. Over the past four to five years there have been a number of journal articles published related to the cooling of high-density data centers. The purpose of this paper is to review all of these articles and capture the recommendations/guidelines that pertain to best

The dimensionless capture index (CI) is proposed as a cooling performance metric based solely on the airflow patterns associated with the supply of cool air to, or the removal of hot air from, a rack. The capture index is typically a rack-by-rack metric and has values between zero and 100%;