AIVC - Air Infiltration and Ventilation Centre

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air tightness

Airtightness testing in theory and practice. Tathetsprovning i teori och praktik.

Notes initial airtightness requirements in SBN 1980 and discusses various forms of ventilation. Discusses how tightness testing can reveal location and magnitude of leaks. Gives theoretical method of calculating air leakage flow and relates this to practical measurement. Considers different alternatives such as pressurising the building and combining tightness testing with thermography. Discusses 1980 building regulations and what buildings ought to be tested. Lists critical points of a building and measures which can contribute to good airtightness.

Air tightness of external envelopes of concrete buildings. Moljets tathet hos betongbyggnader.

Measurements made in Finland have shown that the airtightness of many small houses is lower then the level of requirements specified in Sweden. States that the most important areas for sealing up external walls in concrete structures are the joints in the internal shell, the joints between concrete and timber structures, and the joints between door and window frames. All these areas can be made airtight by using appropriate materials and construction methods. In general, the air tightness of small concrete houseshas been found to be good and to comply with the specified requirements.

The demands on tightness can be specified. Tathetsfordringarna kan preciseras

The air tightness of buildings is part of an investigation performed by the State Research Centre of Finland. Regulations are being developed in Finland for the maximum allowable leakage in buildings. These can be stated as 0.2 ach/hr for residences, 0.1 ach/hr for low apartment buildings, and 0.2 ach/hr for high rise buildings. Tightness can be measured using a suitable fan connected to a board in a window or door opening, or by thermography.

Air tightness v. air infiltration for Swedish Homes - measurements and modelling.

Measures air infiltration and tightness of Swedish houses using the tracer gas technique and the fan pressurisation technique. Uses a previously developed model correlating air tightness and infiltration to evaluate the performance of Swedish homes. Shows that it is difficult to achieve the recommended minimum ventilation rate according to the Swedish Building Code by relying on natural air infiltration. Most new homes do, however meet the Code's stringent air tightness requirements. A comparison with American houses show that Swedish homes are very tight.

Air infiltration problems in ventilation systems.

Presents the latest results of air infiltration research in Finland. The aim is to increase the knowledge of the influences of air infiltration on energy consumption, ventilation and indoor climate. Briefly describes the principles of a calculation model for predicting the interconnection between airtightness and air change rate. Describes improvement of air tightness in Finnish buildings, with special attention to construction details. Discusses possibilities of draughtless and controlled fresh air intake through the building envelope.

Thermal insulation and tightness in buildings. Bygningers varmeisolering og tetthet.

Reviews new regulations and their consequences for external wall structures. Considers energy savings, air tightness requirements, U-values, air movement and zone division, heavy and light structures, building classification according to room temperature, incidental heat gains from insolation.

Pilot research on hygrothermal comfort and air quality in a low energy house.

Describes detailed experimental analysis of the low energy Plainevaux House with regard to:< 1. Air infiltration, measured by the decay rate of CO2 tracer gas< 2. Air tightness, measured by the fan pressurization technique< 3. The evolution of inside temperature in a period of no-heating< 4. The corresponding air contamination.

The application of structural measures for energy conservation in existing buildings.

Illustrates the measures which can be carried out on building elements in order to save energy. Describes different methods and states advantages and disadvantages as well as suitable combinations of measures. Includes descriptions of how to improve windows and doors, and a calculation of theenergy conservation measures.

Energy research pertaining to buildings in Finland

Describes the main energy R and D projects in the building sector which are financed by the Finnish Ministry of Trade and Industry. Projects in the 1970's included improving the air tightness of buildings, and balancing and controlling ventilation systems. Projects started in the 1980's include energy-economic improvement of ventilation and the building envelope, and development of heat pumps.

Cost of energy conservation measures for new housing.

Presents the extra costs in new housing of a number of measures designed to reduce space heating costs. The measures used to reduce energy consumption in new houses in Sakatoon were:< 1. airtightness with controlled ventilation< 2. superinsulation< 3. use of the south windows for passive solar gain.< States that results are applicable in most parts of the Canadian prairie.