LoginExisting experimental techniques for calculating air flow through building cracks are usually based upon relationships derived from experimental studies employing relatively simple procedures.
17th AIVC Conference - Gothenburg, Sweden - 17-20 September 1996
The 17th AIVC Conference - Optimum Ventilation and Air Flow Control in Buildings, was held in Gothenburg, Sweden, 17-20 September 1996.
Contains 62 papers.
Volume content
A technique to improve the performance of displacement ventilation during cold climate conditions. | 1996 | English
Ventilation by displacement is a type of ventilation where the air flow is thermally driven.
The influence of outdoor air vents and airtightness on natural ventilation - calculations based on measurements. | 1996 | English
Many modern buildings in the Nordic countries have mechanical ventilation. Passive stack ventilation is, however, an accepted ventilation system in the Nordic countries according to the current building codes.
Train tunnels and subways are an interesting field of ventilation. Trains move air through tunnels at rates of 600 m³/s (over 2 x 10^6 m³ per hour) which is much more than flow rates in buildings.
The suitability of night ventilation for cooling for the UK is first assessed by presenting plots of summer weather data on the bioclimatic chart for three locations within the country.
The common way to determine air infiltration, exfiltration and interzonal flows from tracer gas measurements in multizoned buildings is to rely upon the standard single or multizone model, Vc(t) = Qc(t)+p(t) .
The evolution of ventilation in manufactured housing in the Northwestern United States. | 1996 | English
Electric utilities in the Pacific Northwest have spent over $100 million to support energy efficiency improvements in the HUD-code manufactured housing industry in the Pacific Northwest over the past several years.
Modelling and assessing ventilation efficiency in an imperfectly mixed ventilated air space. | 1996 | English
To ensure indoor air quality an efficient ventilation system should provide fresh air in those parts of a room where it is required.
System safety of the performance of mechanical ventilation systems can of course be analysed by means of general methods for system safety analysis. Such methods are used a lot in industrial practice, especially in manufacturing industry.
Wind pressures can significantly affect ventilation performance. However often they are overlooked in the design of a naturally ventilated building, with buoyancy forces presumed to offer the worst case scenario for design.
Application of the tracer gas techniques for the assessment of ventilation indexes in real buildings. | 1996 | English
The work presented in this paper is aimed at the definition of tracer gas experimental procedures for measuring the air change rate, the age of air and the air change efficiency in real buildings under mechanical ventilation conditions.
This paper describes an experimental investigation into the operation of a modified Trombe wall.
Ad Hoc Group 4 of Working Group 2 of CEN TC156 (Ventilation) was set up to put forward standardised techniques for estimating ventilation rates in dwellings.
Especially in modern buildings with small capacity of humidity storage it is necessary to reduce the humidity in the supply air. Normally this was done by using a refrigeration system mostly with CFC's.
Application of a passive tracer gas technique in naturally and mechanically ventilated school buildings. | 1996 | English
The homogeneous emission passive tracer gas technique is described. This technique relies on an even distribution of constant tracer gas emission rate within the object to be measured, so that the emission rate per volume unit is constant.
The work described in this paper is aimed at predicting the local values of the ventilation eflectiveness parameters of large industrial buildings by a technique which involves the use of computational fluid dynamics and multizonal modelling.
Ventilation performance evaluation using passively-generated carbon dioxide as a tracer gas. | 1996 | English
Tracer gases are commonly used to evaluate the performance of ventilation systems. One way to reduce the time, complexity, and cost of such experiments is to use the carbon dioxide generated by occupants as a tracer gas.
The project described in this paper has performed simulations using a multi-zone air flow model (4(COMIS)) of three different passive stack ventilation systems.
Maximum velocity of return flow close to the floor in a ventilated room - experimental and numerical results. | 1996 | English
The problem of sensation of draught in ventilated spaces is connected to inappropriate velocities in the occupied zone. In Scandinavia, velocities higher than 0.15 m/s are said to be an indicator of that occupants are likely to feel discomfort.
A study of the reliability of systems by considering the ability of different systems to maintain a required air flow rate over time is included in a subtask of IEA Annex 27 "Evaluation and Demonstration of Domestic Ventilation Systems".