Treats the three main factors contributing to ventilation heat loss- natural air exchange driven by wind pressure and temperature differences, air exchange caused by the user and forced air change under the influence of exhaust air installati
Points of view from Norwegian Building Research Institute resulting from nationwide investigation into building airtightness. Notes significance of airtightness conditions in apartments and single family dwellings.
The purpose of the study was to identify the air tightness levels of a group of 176 houses in Saskatoon, using a pressure test procedure. The houses were categorized according to age, air tightness levels, construction style and contractor. It was found that age was the most significant variable affecting airtightness.
Describes the use of SF6 tracer gas measurement techniques employed in airtightness and ventilation research at Princeton in terraced housing. Notes use of measurement results for constructing models describing the total adventitious ventilation in a house. Refers also to similar techniques used in research at Berkeley in single family dwellings.
As part of a study by the Building Research Foundation on control methods for the thermal quality of homes, research has been carried out into the usefulness and consequences of a measuring method for the determination of the the airtightness of houses. Airtightness measurements were carried out in sixhouses. Data on occurring ventilation was already available from other research. It appears that the pressurization test for the airtightness of houses can be used to determine the thermal quality of the home.
The first part of the study describes thermography generally as a method for non-destructive testing of a building envelope for thermal and air tightness properties. The study has resulted in a two stage testing method of which pressurizing is an essential part. The field study has shown that thetwo-stage method is suitable in detection of air leakages, showing that the major part of thermal defects in the building envelope are due to air leakages.