Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Poster introductions 17: Heat and moisture transfer - experimental
Thursday, 26/Aug/2021:
11:35am - 12:00pm

Session Chair: Prof. Hans Janssen, KU Leuven
Location: Room 1 - Room 082, Building: 116

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11:35am - 11:38am

In-situ measurements of the U-value of a ventilated wall assembly

Mohammad Rahiminejad, Dolaana Khovalyg

École polytechnique fédérale de Lausanne, Switzerland

The walls in a building envelope have the largest contact area with the exterior environment and, therefore, a considerable portion of the thermal energy can be lost through the walls compared to the other parts of the building envelope. For energy-saving purposes, the thermal transmittance of walls is limited to a fixed number by building energy performance standards at the national level. However, the presence of a ventilated air-space behind the external cladding, which has variable hydro-dynamic behavior, can differently affect the total thermal transmittance of the entire structure. This paper aims to provide an experimental analysis of the total U-value of a ventilated wall assembly measured in a building prototype following the average method defined by ISO 9869-1:2014. Differences between the calculated theoretical U-value and the measured U-value obtained using the average method are compared. The contribution of the thermal resistance of the ventilated air-space in the total thermal transmittance of the wall assembly is also analyzed. The results show that the air movement and the enthalpy flow in the ventilated cavity can affect the thermal performance of the wall structure to a certain extent.

11:38am - 11:41am

The Hybrid-Agile Design of Experiments Methodology

Klodian Gradeci, Malin Sletnes


A DOE (Design of Experiments) is the laying out of a detailed experimental plan in advance of doing the experiment. Optimal DOEs maximize the amount of information that can be obtained for a given amount of experimental effort. The traditional DOE methodology is waterfall-type methodology implying a sequential and linear life-cycle process. The success of the experiment and usefulness of the results are highly dependent on the initial experimental setup and assumptions, and does not allow to go back and change something that was not well-documented or thought upon in the design stage. The fast-changing software development industry have made it understandable that the traditional waterfall methodology for developing systems, which follows similar patters to the traditional DOE, lacks the agility required for developing robust systems. These limitations have triggered the development of agile – a type of incremental model of software development based on principles that focuses more on flexible responses to change, instead of in-depth planning at the design stage. This paper proposes the hybrid-agile DOE methodology – a methodology that incorporates agile principles in traditional waterfall DOE methodologies – to design effective experimental layouts that allow for improvement during the experimental trial process. The methodology is applied to the natural ageing of adhesives tapes for building applications. This methodology can overcome traditional DOE, by adding agility in the whole process, especially in cases where the investigated product(s) lack prior information and are characterised by large variability.

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