English

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.

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%;

Data center facilities that house computer equipment represent a high capital investment and are typically designed to function for at least a few years, often without any down time. The computer equipment is usually designed with the assumption of rack air inlet temperatures in the 20-30C range. Although there are many different perspectives for optimizing such a computing facility, ensuring device reliability by delivering uninterruptible power and cool air to the inlet of the electronics remains the most important goal.

In low-energy building design, energy consumption due to space conditioning is responsible for over 30% of total energy consumed in commercial buildings. In an effort to evaluate low-energy building designs, two commercial office buildings were each monitored for 16 months. A comparison of the two buildings, with different ventilation strategies but located in the same climate, is presented. One is naturally ventilated without mechanical chillers, and the other uses a raised floor system combined with a chilled ceiling for space conditioning.

This paper describes the Frederick Lanchester Library at Coventry University, UK, that incorporates natural ventilation, daylighting and passive cooling strategies and presents the energy consumption and the internal temperatures and CO2 levels recorded in 2004/2005. The performances are good, the building uses under half the energy of a standard air-conditioned building and can keep the interior comfortable and up to 5C below ambient.

Monitoring campaigns have been carried out over 2 or 3 years in 12 low-energy office buildings located in three different summer climate zones (summer cool, moderate, and summer hot) in Germany. The raw data were processed for data evaluation of the time of occupancy. A comfort evaluation in these 12 low-energy office buildings indicates clearly that buildings using only natural heat sinks for cooling provide a good thermal comfort during typical and warm summer periods in Germany.

The potential use of natural ventilation as a passive cooling system in new building designs in Kayseri, a midsize city in Turkey, was investigated for that study. Indoor air velocity distributions were simulated by the Fluent package program. Using the simulated data, an artificial neural network (ANN) model was developed for the prediction of indoor average and maximum air velocities. A high correlation was found between the simulated and the ANN predicted data.

The university of Michigan and its stakeholders invested in the creation of the Life Science Institute (LSI) , state-of-the-art research facility, to foster basic and translational research. That paper gives a description of that six-floors building, its design considerations, the central plant heating and cooling, the vivarium space design based on a ventilated cage rack system. The environmental impact is presented too.