AIVC - Air Infiltration and Ventilation Centre

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mechanical ventilation

Comparison of ventilation systems in an experimental building in Helsinki. Ilmanvaihtojarjestelmavertailu koerakennuskohteessa kasarminkatu 24

Performs an investigation concerning the operation of ventilation systems in an old building (a museum) after extensive repairs have been made. The new ventilation system is a supply and exhaust type. Measures ventilation rate and energy consumption for 1. mechanical air supply and and exhaust 2. Mechanical exhaust only 3. Exhaust from the secondary space only with other ventilation ducts closed. Uses nitrous oxide as tracer gas. Measurement of radon concentration shows that concentration is lower in 1 than 2, in spite of the fact that the air change rate is the same in both (0.7 ach).

What is an efficient ventilation system? Vad ar ett effektivt ventilations system?

Notes that there is currently no generally accepted term for the efficiency of a system in terms of pollution removal. Different proposals have been suggested. There is now sufficient factual data to determine the difference inability of different systems to evacuate pollution. This is despite the factthat the requirement for minimum flow is the same for all fan-assisted ventilation. The requirement is also unrelated to whether the system is an extract or push-pull system and where the ventilation devices are positioned.

Component leakage testing in residential buildings.

Describes measurements of the leakage area of fireplaces,bathroom and kitchen exhaust vents, electrical outlets and leakage in the ducts of forced air distribution systems. Makes component leakage measurements in a total of 34houses in Atlanta, Georgia, Reno Nevada and the San Francisco Bay area. Finds damperless fireplaces and ductwork to be the most significant sources of leakage in the western houses.

Industrial ventilation - a review and update.

Reviews technical progress being made in the industrial ventilation field by different investigators through out the world. Subjects reviewed and updated include natural ventilation, local exhaust ventilation, specialised ventilation techniques (dilution, air jets, air curtains, recirculation of filtered air, tracers for ventilation studies) and mine ventilation. Presents typical applications of the new technology to solving industrial ventilation problems, and identifies areas requiring further research and development.

Methods for control of indoor air quality.

Identifies alternative methods available to control indoor air pollutant exposures. Describes the performance characteristics of ventilation systems and of air cleaning devices used in mixed modes for ventilation of occupied spaces. Reviews models for predicting effectiveness of several alternative modes, with field trial validation results cited where available. Briefly reviews previous confined-space studies as points of departure for consideration of necessary air quality, ventilation and air cleaning.

Domestic ventilation in the future. Zukunftige Wohnungsluftung.

Treats the relation between transmission heat loss and ventilation heat loss of buildings. Notes normal methods of fresh air ventilation of dwellings and problems arising with buildings being made increasingly airtight so that air infiltration is greatly reduced with consequent condensation and lack of maintenance of minimum hygiene standards. Illustrates and discusses possible future ventilation systems including mechanical supply and extract ventilation systems incorporating heat recovery systems. Illustrates several alternatives diagramatically.

The influence of ventilation on indoor/outdoor air contaminants in an office building.

Studies a modern energy efficient office building in a series of experiments with mobile laboratories connected on-line with the building. Measures inorganic air contaminants (CO, CO2, NO2). Makes off-line measurements of volatile organic con

Low-infiltration housing in Rochester New York-A study of air-exchange rates and indoor air quality.

Studies a sample of 58 occupied homes in Rochester NY to assess 1. the effectiveness of construction techniques designed to reduce air leakage 2. the indoor air quality and air-exchange rates in selected airtight houses and 3. the impact on

Ten rules for domestic ventilation. Adequate air rate alone is no longer sufficient. Zehn regeln zur wohnungsluftung. Ausrreichender luftwechsel allein reicht nicht aus.

Lists and explains the 10 rules to ensure correct domestic ventilation< 1. Ensuring the correct air supply< 2. Maintaining correct flow directions< 3. Maintaining stable ventilation conditions< 4. Avoiding discomfort zones< 5. Maximum use of window ventilation< 6. Matching the flow of air to the ventilation requirement< 7. Observing energy saving ventilation principles< 8. Considering smoke carryover in case of fire<9. Quiet operation<10. Ensuring low maintenance requirements for the system< Illustrates examples of ventilation practice in diagrams.