9-10 October 2024, Conference, Dublin– 44th AIVC conference

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.

Conference Scope

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4-5 October 2023, Conference, Copenhagen– 43rd AIVC conference

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.

Conference Scope

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19 January 2021, Webinar – Building airtightness improvements of the building stock- Analysis of European databases

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.

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Submit your abstracts for the AIVC 2024 Conference, Dublin

We are pleased to announce that the AIVC 2024 Conference “Retrofitting the Building Stock: Challenges and Opportunities for Indoor Environmental Quality" is now accepting abstracts & proposals for topical sessions. The Conference will be held on October 9-10, 2024, at Croke Park, Dublin, Ireland. It will be a joint event combined with the 12th TightVent and the 10th venticool conferences.

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AIVC VIP 47: High-rise buildings airtightness – error due to stack effect on point measurements

The AIVC has just released a new publication!

AIVC's Ventilation Information Paper #47: High-rise buildings airtightness – error due to stack effect on point measurements gives guidance to perform a pressurization test in high-rise buildings and suggests new criteria to replace standard requirements when they cannot be met.

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VIP 47: High-rise buildings airtightness – error due to stack effect on point measurements

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.

Building airtightness impact on Energy Performance (EP) calculations

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.

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VIP 46: Building airtightness impact on Energy Performance (EP) calculations

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.

Impact of Building Airtightness on Heat Generator and Heat Emission Equipment Sizing

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.

Airtightness of Buildings—Evaluation of Leakage-Infiltration Ratio and Systematic Measurement Error due to Steady Wind and Stack Effect

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).

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