Submitted by Maria.Kapsalaki on Tue, 03/05/2024 - 14:22
This article provides a summary of a comprehensive examination of the current ISO 9972 standard, focusing on the enhancements needed to improve its reliability and validity for airtightness tests in buildings. A working group composed of international experts has identified a list of issues warranting a potential revision of the standard. New recommendations are proposed based on research and consultation, including detailed considerations of previous guidelines and existing scientific literature.
Submitted by Maria.Kapsalaki on Tue, 03/05/2024 - 14:21
The content presented comes from the paper under review “Quantitative correlation between buildings air permeability indicators: statistical analyses of about 500,000 measurements” (Moujalled, 2023a).
Submitted by Maria.Kapsalaki on Fri, 10/27/2023 - 10:03
AIVC's Ventilation Information Paper #47 gives guidance to perform a pressurization test in high-rise buildings and suggests new criteria to replace standard requirements when they cannot be met.
The AIVC is happy to announce the release of a new publication!
AIVC's Ventilation Information Paper #46: Building airtightness impact on Energy Performance (EP) calculations aims to explain simplified models developed and used around the world to estimate the infiltration rate for Energy Performance (EP) calculations and give some examples of methodologies applied in various countries.
Submitted by Maria.Kapsalaki on Fri, 09/22/2023 - 13:11
Many simplified models have been developed and are used around the world to estimate the infiltration rate for Energy Performance (EP) calculations, with different levels of accuracy, as described below. For example, the wind velocity can be estimated hourly, monthly or annually; based on the local climate or fixed estimated values; with or without taking into account shielding factors; etc.
AIVC's Ventilation Information Paper #46 aims to explain these simplified models and give some examples of methodologies applied in various countries.
Submitted by Maria.Kapsalaki on Wed, 06/28/2023 - 17:03
Cracks in building fabric lead to air infiltration due to wind and buoyancy driven forces. In the heating season, the cold air entering the building needs to be heated up to room temperature, thus leading to an energy demand. Conventionally, the measured infiltration rate at 50 Pa (expressed as n50 or q50) is recalculated into an average infiltration flow rate (yearly based) using leak infiltration ratio’s (LIR) ranging from 0.033 to 0.1, the origin of these values being sometimes unclear.