AIVC - Air Infiltration and Ventilation Centre

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air leakage

Decrease of radon exposure by continuously adjusted and controlled ventilation.

A new mechanical ventilation system which continuously controlled the indoor-outdoor pressure difference was installed in six houses, where the long-term radon levels ranged from 670 to 3 080 Bq/m3. When the new system had operated for several months, the indoor radon levels decreased to levels from 120 to 600 Bq/m3 , the effective dose reductions being from 40 % to 88 %.

Building pressure.

Uncontrolled air infiltration in buildings is compromising energy efficiency and wrecking attempts to reduce CO2 emissions. The time is right to act. This month, Building Services Journal announces a joint initiative involving the CIBSE, BRE and the BSRIA, aimed at improving building airtightness. In an exclusive report, ClBSE president Geoffrey Brundrett launches the airtightness campaign. 

A commissionable air barrier system for the building envelope.

Since the mid 70's, the construction industry has made significant advances in energy conservation and improved indoor conditions. These improvements, however, are shadowed  by an increase in building envelope problems to include water penetration, condensation on and in roofs and exterior walls and cladding damages in many of our newer buildings; These problems have been attributed to uncontrolled air leakage.

Predicting envelope air leakage in large commercial buildings before construction.

The concept of 'build tight - ventilate right' requires minimising air infiltration through theenvelope of a building and then providing adequate ventilation in a controlled manner tosatisfy the fresh air requirements of occupants. This paper describes a simple-to-use designtool (PC based and in spreadsheet format) for predicting the airtightness of office buildingenvelopes either at the design stage or before a major refurbishment.

Field measurements of heating system efficiency and air leakage in energy-efficient manufactured homes.

Detailed field measurement of air leakage and electric forced-air heating system efficiency in nine Pacific Northwest manufactured homes built to adapted Model Conservation Standards were conducted during the 1994 and 1995 heating seasons. The research measured directly both heat delivery efficiency and system efficiency (as defined by ASHRAE in its HVAC Systems and Equipment Handbook) with a short-term alternating coheat test. For this test, a home is alternately heated with the furnace and then with an array of small electric heaters placed in each room which has a supply register.