Journal
- 2026-10-12
Why can a large building have a lower n50?
A large building can have a lower n50 even when its leakage per square metre of envelope is no lower. The reason is geometric: n50 divides the airflow at 50 Pa by the test volume,
- 2026-10-12
Why an external-dimension Ψ-value can be negative
A negative Ψ-value from an external-dimension calculation does not mean heat travels from outdoors into the building. Ψ is a difference between the heat flow calculated through a j
- 2026-10-12
What a Gap Between Positive and Negative Pressure Results Reveals
A gap between pressurisation and depressurisation results can reveal that airflow through the tested envelope differs by pressure direction, or that test conditions and measurement
- 2026-10-12
How ΣUA, ΣΨL and Point Bridges Combine
The direct transmission heat-transfer coefficient combines three contributions: ΣUA for plane elements, ΣΨL for linear junctions and Σχ for point bridges. Each contribution is expr