Natural ventilation, which may provide occupants with good indoor air quality and a high level of thermal comfort, and reduce energy costs, has become an important sustainable strategy in building designs. This investigation used three computational fluid dynamics (CFD) models: steady Reynolds averaged Navier-Stokes equation (RANS) modelling, unsteady RANS modelling, and large eddy simulation (LES) to study both wind-driven and buoyancy-driven natural ventilation.

Passive stack ventilation systems have been used for a number of years throughout the world. They were specifically mentioned within the 1995 revision of the Building Regulations for England and Wales as a means of compliance. BRE Information Paper 13/94 gives recommendations for the design of duct systems within dwellings that place restrictions upon the number and severity of bends that may be used. These restrictions limit the scope for the use of passive stack ventilation within dwellings.

Airflow measurement techniques are necessary to determine the most basic of indoor air quality questions: "Is there enough fresh air to provide a healthy environment for the occupants of the building?" This paper outlines airflow measurement techniques, but it does not make recommendations for techniques that should be used. The airflows that will be discussed are those within a room or zone, those between rooms or zones, such as through doorways (open or closed) or passive vents, those between the building and outdoors, and those through mechanical air distribution systems.

This paper presents an overview of systems that utilise thermal mass in conjunction with night ventilation. It discusses the concepts behind and development of a system (CoolDeck) to improve the performance of systems where air is ventilated through false ceiling and floor voids to access hidden mass. The system improves thermal interaction between the circulating air and the thermal mass of the slab. A case study is presented demonstrating the effectiveness of the system in a refurbishment application (Stevenage Borough Council (UK) offices).

Gives an extensive list of literature on the topic and provides a detailed analysis of several aspects of the problems which can occur. States that good ductwork design and installation are key to providing well balanced ventilation systems, and lists a number of fundamental handbooks which carefully outline the essential elements of designing ventilation air ductwork. Describes various methods including the constant velocity method, the velocity reduction method, the equal friction method, and the static regain method.

This bibliography is aimed at those building professionals who are looking for an overview of current developments in duct cleanliness and design. The quality of the indoor air depends as much on the cleanliness of the equipment and ductwork it passes through before reaching the occupied space as it does on the quality of the outdoor environment. This bibliography will review the sources and types of contamination found in ventilation ductwork, including dust, oil residue, fungal growth, and chemical emissions.

The observation of wind pressure acting on the wall and floor of a full-scale building model under cross ventilation was carried out. The measurement of air flow was also undertaken, and the existing prediction theory of the air flow rate, namely the orifice flow equation, including the discharge coefficient, was evaluated for its accuracy. At the same time, a method of predicting the discharge coefficient has been proposed and tested.

The research described in this paper is part of a project aimed at improving energy costs and the indoor environment of atrium buildings. Tracer gas techniques were used to assess the ventilation performance in terms of air distribution and contaminant migration patterns and to measure the air infiltration rate of a three-storey atrium. This atrium serves as an entrance to a large office-laboratory complex.

The aim of this bibliography is to review and technically assess research into the impact of urban air pollution on the indoor environment. It includes a brief summary of relevant technical papers on the subject and lists those papers with accompanying bibliographic details.