AIVC - Air Infiltration and Ventilation Centre

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air quality

Indoor air quality measurements in an air-conditioned office building.

Air qulaity measurements along with airflow rate measurements of air conditioning system were conducted in an office building occupied by workers with clerical activities. Contaminamts measured were CO2, SPM (suspended particulate matters) NOx and airborne bacteria. Indoor CO2 and SPM levels were found to be quite high, 1,600 ppm (CO2) and 0.25mg/ m3 (SPM), respectively, at their maximum and exceeded Japanese Standards The cause of the high concentration was found to be air leakage in the outdoor air intake duct. The air leakage rate was estimated applying mass-balance model of CO2.

A prototype ventilation system for superinsulated houses using forced air duct systems.

The Energy Division is working toward development of ventilation systems capable of providing acceptable levels of indoor air quality in superinsulated houses. The research was designed to analyze and improve the indoor air quality of a superinsulated retrofit house located in St. Paul, Minnesota. The occupants had encountered 'stuffy air' problems after their house was superinsulated and weatherized to reduce heat loss, and uncontrolled air infiltration. High levels of CO2 build up were revealed indoors, despite the presence of a continuously operating air-to-air heat exchanger.

Indoor air quality

Discusses the interrelationship of home ventilation rates, sources of air contaminants, and the relative quality of the indoor air environment, including: what is an unsafe air quality level? The problem in perspective, common household pollutants, home ventilation, identification and testing.

Seek air quality answers.

Reports a one-day seminar addressing 'The character and control of indoor air pollution', involving experts from both the public and private sector. Summarises the problems, the pollutants involved and some possible solutions.

Air quality control - measurements and experiences.

Too high a concentration of certain gases (e.g. water vapour, carbon dioxide, tobacco smoke, alcohol, etc.) in public buildings can damage the health. Even low concentrations can cause discomfort and make the room air seem unpleasant. This paper describes this subjective perception of air qulaity. It is shown that installation of an appropriate sensor can make substantial energy savings.

The relationship between observed pollutant concentrations and building ventilation system design.

The relationship between the observed concentration of air pollutants at points within a building and the characteristics of the ventilation system is examined, and a basic set of analytical expressions showing these relationships is presented. The extension to large and complex systems is considered, and an example of the application of the equations to an actual air quality problem is given.

The impact of building ventilation on indoor gaseous and particulate pollution in office and institutional buildings.

Effectiveness of ventilation as a major means of controlling indoor air quality was evaluated by correlating concentrations of gaseous (CO and CO2) and particulate (total) pollutants with two ventilation parameters. Pollutants are differently af

Status - ventilation models for indoor air quality.

As measurements are essential for performance assessment, models are essential for design. Both empirical and rational models are being developed for predicting the effectiveness of ventilation for acceptable indoor air quality. In this status report, models for contaminant generation rates, and dilution and removal control are introduced through a simple, one-compartment model.

Indoor air, volume 6: evaluations and conclusions for health sciences and technology.

Contains further papers, reports and conference summaries from the 3rd International Conference on Indoor Air Quality and Climate, 1984, as well as afull list of authors and titles of papers printed in this and the previous volumes.

Objective determination of indoor air quality using passive air samplers and bioassays. Final Report.

This report details the development and field testing of a passive sampler system to collect gaseous and particulate contaminants in indoor air and the evaluation of the collected materials for biological effects using a simple bioassay system. The passive sampler-biossay system is a cost-effective objective method for determining indoor air quality.

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