ventilation systems

On 9-10 October 2024, the AIVC – TightVent - venticool 2024 joint Conference "Retrofitting the Building Stock: Challenges and Opportunities for Indoor Environmental Quality", was organised by the International Network on Ventilation and Energy Performance (INIVE) on behalf of the Air Infiltration and Ventilation Centre (AIVC), the Building and Ductwork Airtightness Platform (TightVent Europe) and the international platform for

The book of proceedings of the 14^th International BUILDAIR Symposium "Airtight Buildings, Thermography and Ventilation Systems in Practice",  held on May 16-17, 2025 in Hannover, Germany. Contains 44 abstracts.

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...

Der Zweck dieser Arbeit ist die Bewertung und der Vergleich verschiedener Regressions- verfahren - insbesondere der gewöhnlichen kleinsten Quadrate (OLS), der gewichteten kleinsten Quadrate (WLS) und der gewichteten organischen Korrelationslinie (WLOC) – im Zusammen- hang mit Luftdichtheitsmessungen...

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...

Im Zuge der Überarbeitung der Messnorm ISO 9972 werden verschiedene Methoden der Regressionsrechnung und der Fehlerrechnung diskutiert. Diese Methoden werden im Vortrag erklärt. Es soll deutlich werden, welche Ideen hinter den Formeln stecken. Die verschiedenen Methoden werden anhand von Beispielen und von Grafiken...

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...

Ein Teil des AEGIR-Projekts zielt darauf ab, einen digitalen, nachhaltigen Rahmen zu entwickeln, der die Einführung umfassender Sanierungen fördert und nahezu energieneutrale Gebäude ermöglicht. Zu diesem Zweck arbeitet das Fraunhofer ISE an einem Python-basierten Programm, das automatisch optimale Routen...

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...