English

The purpose of this work is to evaluate and compare various regression techniques—specifically Ordinary Least Squares (OLS), Weighted Least Squares (WLS), and Weighted Line of Organic Correlation (WLOC)—in the context of building airtightness measurements as prescribed by ISO 9972. The goal is to improve the accuracy...

During this presentation I will discuss different methods of regression analysis and error calculation with regard to the review of the measurement standard ISO 9972. I will explain these methods and the ideas behind the formulas. I will present examples and charts to explain the different methods and evaluate them on the basis...

Part of the AEGIR-project is to aim for a digital sustainable framework that boosts the take-up of deep retrofitting, achieving nearly zero energy buildings. For this, Fraunhofer ISE is working on a Python-based program to automatically find optimal routes for facade-integrated ventilation ductwork. This study outlines a methodology...

Is it possible to derive an outside air flow rate from the net air exchange rate nL50 and use it for ventilating dwelling units? We calculated the outside air flow rates via leaks in the envelope area as per standards and matched them with the values from real construction projects. Typically, the outside air flow rate via infiltration is derived...

As a consultant and operator of Blower Door testing, one often wonders about the durability of materials over a building's lifetime. It is not uncommon to see products where tapes and sealing materials fail after a very short period. This raises the question of whether airtightness can truly be considered a quality parameter...

The certification of the first Low Energy hospital tested by the Passive House methodology for large-scale buildings in Thessaloniki, Greece. The Passive House protocol for Airtightness measurement of high-rise buildings was followed and the EN 13829 standard was applied for the measurement. As a medical facility for...

Performing an airtightness test of a very airtight large building under special indoor climatic conditions may still represent a challenging task. This paper reports on practical experience with airtightness testing of two freezing rooms of approx. 200.000 m³ at internal temperatures of -20 °C and +8 °C...

ISO 9972 describes the measurement procedure and calculation methods for determining the air permeability of buildings using the fan pressurization method. However, recent works have strongly underlined the need to improve the method's reliability and the uncertainty evaluation. The objective of this presentation...

The presentation gives an overview of the developments of regulations in the Belgian context with respect to indoor air quality, ventilation and airtightness. There is a systematic description of the regulations at Belgian and regional level with respect to indoor air quality, ventilation and building airtightness. The paper describes 4 regulatory...

This work presents an overview and comparison of building and ductwork airtightness trends across 16 countries. It focuses on the national regulations, requirements, and drivers promoting airtightness in buildings and ductwork, and how airtightness is included in energy performance calculations...