AIVC - Air Infiltration and Ventilation Centre

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Demand-controlled ventilation - an alternative to unnecessary air conditioning. Tarpeettoman ilmastoinnin vaihtoehto - tarpeenmukainen ilmanvaihto.

Good indoor air quality and thermal comfort and good energy-efficiency can be achieved simultaneously only if the amount of ventilation can be demand-controlled. Two approaches are discussed in the article: CO2- control and use of so-called air quality sensors. The first experiments have been promising but further development of equipment is still needed, in order to improve the reliability and economy of demand-controlled ventilation.

Quality improvements in displacement ventilation. Kvalitetsforbedring ved fortrengningsventilasjon.

Gives a history of the development of air conditioning, and displacement ventilation in particular. Discusses the constant problem of working environments - contamination, and the 'side effects' of economy measures resulting from the 1974 oil crisis. Refers to collaboration between HVAC engineers and the health authorities. Recommends the use of displacement ventilation because of its improvement in air quality. Considers the problems caused by the use of floor coverings and filled carpets in particular.

Indoor air quality: some residential answers.

Treats major design and construction actions that can be taken in houses to limit conduction losses, increase heating performance, reduce energy losses through windows and provide adequate ventilation air - super insulation, high performance furnace or boiler, high performance windows and controlled ventilation. Discusses in some detail how controlling indoor air pollutants at source is the preferred approach to maintaining indoor air quality. Illustrates diagrammatically and explains how a house functions under natural ventilation conditions.

Estimating interroom contaminant movements.

Development of infiltration and interroom airflow calculation methods, driven by a concern for indoor air quality have led to a computer simulation of interroom contaminant movement. The model, which assumes fully mixed room air, shows that open doorways provide rapid mixing between rooms in buildings using forced air heating. It also confirms that it is most energy efficient to remove the contaminant nearest its source. Detailed modeling of the variations in contaminant concentration within a room is not presently feasible for long term energy analysis simulations.

Residential energy conservation strategy.

Describes an energy conservation strategy for a private home in Columbus Ohio and the benefits that resulted after nine years. The net result of the conservation steps was to reduce the annual house heating energy requirement from approximateley 1060 CCF of natural gas to 410 CCF and annual water heating energy requirement from approximately 400 CCF to 234 CCF. Thecombined savings at the present rate of $65/CCF was $530 per year. Includes a list of conclusions drawn from the experiment.

Research on air infiltration, ventilation and indoor air quality in the Federal Republic of Germany.

In December 1985 the Federal Republic of Germany joined the International Energy Agency's Annex V, the Air Infiltration Centre, as the twelfth participant. This report describes and summarises German research and development activities in the areas of ventilation, air infiltration andindoor 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.

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