Submitted by Maria.Kapsalaki on Fri, 10/27/2023 - 10:45
The 44th AIVC conference "Retrofitting the Building Stock: Challenges and Opportunities for Indoor Environmental Quality" will be held on 9 & 10 October 2024 in Dublin, Ireland together with the 12th TightVent conference and the 10th venticool conference. The conference will take place at Croke Park.
Submitted by Maria.Kapsalaki on Thu, 10/06/2022 - 11:22
The 43rd AIVC conference "Ventilation, IEQ and health in sustainable buildings" will be held on 4 & 5 October 2023 in Copenhagen, Denmark together with the 11th TightVent conference and the 9th venticool conference. The conference will take place at Aalborg University Copenhagen.
Submitted by Maria.Kapsalaki on Mon, 12/21/2020 - 11:37
Air infiltration in buildings has multiple consequences on energy use and indoor environmental quality. Therefore, in the last 10 years many countries have introduced requirements for building airtightness in their EP-regulation. Those requirements often prescribe that a test is performed by a qualified tester and that every test performed is recorded in a database. Hundreds of thousands of data are now available in Europe.
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.
Submitted by Maria.Kapsalaki on Tue, 06/27/2023 - 18:22
The fan pressurization method that is widely used to measure the airtightness of buildings is known to have quite large measurement error. It is made up of random measurement error (precision) and systematic measurement error (bias).