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Full-Text Articles in Physics
Hygrothermal Performance Of A Hygroscopic And Permeable Wall Assembly: Impact Of A Vented Wall Cavity, Diane Bastien, Martin Winther-Gaasvig
Hygrothermal Performance Of A Hygroscopic And Permeable Wall Assembly: Impact Of A Vented Wall Cavity, Diane Bastien, Martin Winther-Gaasvig
International Building Physics Conference 2018
Building envelopes that are hygroscopic and permeable to water vapour can contribute to improve the Indoor Environmental Quality (IEQ) in buildings by reducing indoor humidity fluctuations and the concentration of some contaminants like CO2. However, risks of interstitial condensation and mold growth need to be assessed to ensure the durability of such building envelopes. The objective of this paper is to perform hygrothermal simulations of a case study house designed with a Hygroscopic and Permeable Building Envelope (HPBE) and to assess the impact of having a vented cavity compared to a face-sealed wall. This contribution presents hygrothermal simulations of a …
Neural Networks To Predict The Hygrothermal Response Of Building Components In A Probabilistic Framework, Astrid Tijskens, Staf Roels, Hans Janssen
Neural Networks To Predict The Hygrothermal Response Of Building Components In A Probabilistic Framework, Astrid Tijskens, Staf Roels, Hans Janssen
International Building Physics Conference 2018
In recent years, probabilistic assessment of hygrothermal performance of building components has received increasing attention. Given the many uncertainties involved in the hygrothermal behaviour of building components, a probabilistic assessment enables to assess the damage risk more reliably. However, this typically involves thousands of simulations, which easily becomes computationally inhibitive. To overcome this time-efficiency issue, this paper proposes the use of much faster metamodels. This paper focusses on neural networks, as they have proven to be successful in other non-linear and non-stationary research applications. Two types of networks are considered: the traditional multilayer perceptron (with and without a time window) …
Hygrothermal Performance Assessment Of Wall Systems With Various Concrete And Insulation Configurations, Ali Vaseghi, Fitsum Tariku
Hygrothermal Performance Assessment Of Wall Systems With Various Concrete And Insulation Configurations, Ali Vaseghi, Fitsum Tariku
International Building Physics Conference 2018
The moisture performance of building envelope assemblies has always been a major concern of designers. Building envelope is constantly exposed to moisture loads such as exterior and interior humidity, rain, groundwater, snow and construction moisture. Therefore, it is critical to control the moisture migration mechanism within building envelope walls. Moisture accumulation occurs when the wetting potential of building envelope exceeds its drying potential due to applying inappropriate construction materials or configuration designs. Moisture accumulation in mid-rise and high-rise concrete buildings has negative impacts on microbial growth, occupants’ comfort, energy consumption, freeze thaw and compressive and tensile strength of concrete which …
Evaluating The Hygrothermal Performance Of Wooden Beam Heads In 19th Century Town Houses Using In-Situ Measurements, Paul Wegerer, Thomas Bednar
Evaluating The Hygrothermal Performance Of Wooden Beam Heads In 19th Century Town Houses Using In-Situ Measurements, Paul Wegerer, Thomas Bednar
International Building Physics Conference 2018
Improving the energy efficiency of typical 19th century townhouses in middle Europe the focus on the wooden beam bearing’s hygrothermal performance has become more and more important during the last years. There are several issues for the risk of rotting of the wooden parts of the ceiling, because the retrofitting process of the masonry totally changes the hygrothermal conditions inside the wall. Applying an interior insulation or changing the airtightness of the building envelope as well as the introduced moisture from the retrofitting process lead to a moisture increase inside the masonry and might cause rotting of the ceilings’ wooden …
Assessment Of Cumulative Damage Of Selected Building Envelopes Exposed To Various Environmental Effects, Václav Kočí, Jiří Maděra, Robert Černý
Assessment Of Cumulative Damage Of Selected Building Envelopes Exposed To Various Environmental Effects, Václav Kočí, Jiří Maděra, Robert Černý
International Building Physics Conference 2018
Hygrothermal performance of building envelopes based on three different building materials (solid brick, high performance concrete, aerated autoclaved concrete) is assessed under climatic conditions of Prague and Atlantic City. Main objective of the paper is to evaluate the influence of cumulative damage, which was induced by means of natural weathering in 2012- 2015 period, on the long-term performance. The performance is assessed using various measures, namely time-of-wetness function, number of freeze/thaw cycles, and annual amount of energy transmitted through the envelope. The results show that thermal performance of the envelopes gets mostly better after weathering as the annual amount of …
Moisture Monitoring Of Wood-Frame Walls With And Without Exterior Insulation In A Midwestern U.S. Cold Climate, Samuel V. Glass, C. R. Boardman, Borjen Yeh, Kingston Chow
Moisture Monitoring Of Wood-Frame Walls With And Without Exterior Insulation In A Midwestern U.S. Cold Climate, Samuel V. Glass, C. R. Boardman, Borjen Yeh, Kingston Chow
International Building Physics Conference 2018
Continuous exterior insulation is becoming more common in North American above-grade walls in both retrofit applications and new construction, as a means to improve the thermal performance of wall assemblies. Although moisture performance of wood-frame wall assemblies has been studied extensively, the drying capability of wall assemblies with exterior insulation and an interior vapor retarder in cold climates is not well characterized. This study monitored the hygrothermal performance of wall assemblies with and without exterior insulation under high and low interior humidity conditions and with intentional wetting of the wood structural panel sheathing. Moisture content and temperature of standard 38 …