Discusses case histories of rehabilitation work in flats and maisonettes in London, UK. It is clear from the results of these that the ventilation rate is inadequate for the lifestyle in the dwellings considered. Discusses provision of adequate ventilation by use of fans, vents and windows and use of thermal insulation.
A sample of 232 people were questioned during the winter about their bedroom window opening behaviour. They were also invited to cite the ill effects from which they might suffer if their bedroom window were closed all night. The great majority were found to adapt their window opening to the weather. Thereasons for it appear to be related to beliefs regarding ventilation and health.
A design is proposed to improve the performance of wind towers (or Baud-Geers) for natural ventilation and passive cooling. Under similar climatological and design conditions, the new design is capable of delivering air to the building at higher flow rates. It can also cool the air evaporatively to lower temperatures. Higher airflow rates and the evaporative cooling capability of the new Baud-Geer design can be fully utilized at night in summer to cool the building mass to lower temperatures. Momentum, mass and energy analyses are carried out for the proposed design.
Naturally ventilated containers for international transport of hygroscopic commodities are now well established. Both theory and practice show that the greater the vent areas, the wider the range of conditions under which NVCs will succeed, but there are no established values for acceptable areas. Thetheory, conception and utilisation of NVCs are reviewed. Different vent configurations are tested for simulated and for real voyages.
Discusses the future prospects of domestic ventilation and whether mechanical ventilation will be necessary to satisfy requirements as windows become more airtight. Suggests use of centralized mechanical ventilation, with openable windows for summer ventilation.
The filtering effects of three types of air control systems at two wastewater treatment plants on viable particles were investigated. Aspergillus fumigatus and other thermophilic organisms were used as monitors for viable particles. The indoor concentrations of viable particles were found to be affected by building design and the use of conventional mechanical air systems. Viable particles of approximately 4.0 microm and greater in aerodynamic diameter were filtered from the air while respirable size particles less than 4.0 micromwere not filtered as well.
Wind tunnel tests were carried out using models of fallout shelters to determine correlations between shelter ventilation rate, area and distribution of wall openings, and wind speed and its direction relative to the orientation of the shelter. Models of bermed shelters with five different opening configurations were used in these tests. A simple correlation was formulated between the shelter ventilation rate, the total area of windward openings, the ratio of leeward to windward opening areas, and the velocity of the approach wind.
Industrial buildings, particularly those containing nuclear and process plant, often require high standards of ventilation in order to cope with unusual features of the operations or process which take place within the buildings.
A major cooperative study of the effect of ventilation of timber flat (cold) roofs on combatting condensation and moisture accumulation has been undertaken in Denmark. Field measurements of moisture content in a number of test roofs over long periods and under different conditions are evaluated and conclusions drawn. They include the advice that, where moisture accumulation is a problem, it can be aggravated if roof vents are installed.
Login