AIVC - Air Infiltration and Ventilation Centre

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air leakage

Ventilation of dwellings and its disturbances

Treats importance of keeping uncontrolled ventilation to a minimum in buildings equipped with balanced ventilation. Provides theoretical and experimental description of leakage of air past windows. Includes comparison between standards of different countries. Discusses effect on building ventilation of variations of wind and outdoor temperature. Considers in conclusion measurement of air flows between rooms in a building. Describes development of tracer gas method based on computer-assisted evaluation.

1 Infrasonic impedance measurement of buildings for air leakage determination.

Reports preliminary research directed towards developing a new method for measuring the air leakage property of an enclosure. The low-frequency acoustic impedance of the enclosure is measured by an infrasonic method. Describes and analyses a diaphram-type motor-driven source and a pressure sensor with electronic filters used to measure infrasonic impedance.< Reports tests run in enclosures of different volumes and degrees of leakiness.

Infrasonic measurement of building air leakage-a progress report.

Describes infrasonic method of measuring the air leakage of a house or apartment. Describes apparatus, consisting of a motor driven source of known output a sensitive pressure pickup and anelectronic signal processor. A low frequency (about one cycle per second) alternating air flow of known magnitude is applied to the interior of the building, and the alternating component of inside pressure that results is measured. The pressure response is a function of the type and size of leakage paths. Describes measurements made on three interior rooms and gives sample results.

Air leakage measurement of buildings by an infrasonic method

Describes an infrasonic method as an alternative to blower method for measuring the composite effective size of all the air-leakage passages of a building. Sinusoidally varying volumetric flows between 0.05 and 5Hz are generated by a motor-driven bellows-like source located inside the building under test. Resulting pressure variations are measured using a microphone-like sensor having an electronic signal processor. Reports system design and test results obtained to date. One house, five apartment and three interior rooms have been tested.

Consideration of the requirements of air-renewal in rooms taking into account the sealing requirements of windows. Betrachtung der Anforderungen an die Lufterneuerung in Raumen unter Berucksichtigung der Dichtigkeits-anforderungen an Fenster

Considers the rate of natural ventilation required in a room to maintain a healthy concentration of oxygen given the efficient sealing of windows against draughts. Includes a nomogram toassist the calculation of a rate of air introduction according to the height of the building, wind loads, and type of window construction.

Field air infiltration performance of new residential windows.

Reports on a project to assess the air infiltration performance of new residential windows and compare field test results with anticipated performance. Supporting tests and techniques included air leakage tests of windows in the factory, leakage testing of the window/wall installation crack and infrared thermography of test conditions. Tests were also run to determine performance of new windows during cold weather, the possible change in performance over time, the performance of fixed sash and of old and retrofit windows. Presents results of pilot study.

An exhaust fan apparatus for assessing the air leakage characteristics of houses.

Describes portable apparatus used to measure the air leakage of houses. A fan is used to exhaust air from the house and the air flow rate is measured. The air flow rate and corresponding pressure difference across the building can then be used to evaluate the relative air tightness to the house. The fan pressurization test equipment is portable, inexpensive and simple to operate. Describes test procedure and gives a few examples of house characteristic curves.

The measurement of air infiltration through metal-framed windows.

Describes test rig used to measure air leakage through a metal framed window. Gives average of results of leakage for different air pressure. Finds leakage rate of 20 cu. ft/h/ft for air velocity of 30 m.p.h. which was generally less than published results.

The window-probe - a new instrument for checking the installation of windows. Die Fenstersonde - ein neues Messgerat zur Guteprufung imFensterbau.

Describes a probe, developed to measure air flow which can be used to find the leakage profile of a window. Discusses measurement principle, accuracy of measurement and experimental method. Suggest use of the probe for locating leakage points andgiving quantitative data of the amount of leakage. A possible use is for testing windows that are already installed in buildings