Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Hygrothermal"”.
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Modeling the behavior of wood-based composite sheathing under hygrothermal load
In light-frame residential construction wood-based composite panels used externally or internally are exposed to relative humidity and/or temperature changes. The subsequent moisture content change of the panels will result in two types of deformations as follows: 1. elastic deformation of the …
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Modelling local hygrothermal interaction between airflow and porous materials for building applications
… existing models and modelling techniques used in hygrothermal simulations for buildings is presented. This overview shows that at present the existing models can not be used for the applications aimed at in this work as they either do not offer the required level of detail or as there are …
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Durability performance of frp strenghtened concrete beams and columns exposed to hygrothermal environment
… CONCRETE BEAMS AND COLUMNS EXPOSED TO HYGROTHERMAL ENVIRONMENT</p> <p>by</p> <p>ABULGASEM M. ELARBI</p> <p>August 2011</p> <p>Advisor: Dr. Hwai-Chaung Wu</p> <p>Major: Civil and Environmental Engineering (Structural Engineering)</p> <p>Degree: Doctor of Philosophy </p> <p>Concrete …
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Validation of hygrothermal material modelling under consideration of the hysteresis of moisture storage
The achievable accuracy of hygrothermal building component simulation is significantly dependent on the applied material functions. These functions are determined by the material modelling marking the connection between the basic storage and transport parameters which are obtained from basic …
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Impact of added insulation on the hygrothermal performance of leaky exterior wall assemblies
This project proposes an experimental procedure to evaluate the effect of adding insulation to leak exterior wall assemblies and to monitor air leakage paths within them. The procedure involves the construction of a full-scale test hut exposed consecutively to climatic conditions representing …
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Thermally Induced Vibration of a Cross-Ply Laminated Plate with Hygrothermal Effects (Exact Solution)
… exact solution is formulated which describes the hygrothermal effects due to heating and moisture diffusion on one surface of a symmetric cross-ply plate made of AS/3501 graphite epoxy with simply-supported boundary conditions.</p>
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Forced vibration and hygrothermal analysis of composite laminated beams under the action of moving loads
… composite beams subjected to moving loads in a hygrothermal environment is carried out using the general purpose finite element program ANSYS. The moving load model and the hygrothermal incorporation are validated separately by reproducing results available in the literature. The hygrothermal …
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Energy efficiency improvements in traditional buildings: exploring the role of user behaviour in the hygrothermal performance of solid walls.
… investigated; however, its impact on the hygrothermal performance of the envelopes has barely been explored. This research approached the connection between users and buildings from a new angle looking at the effect that user behaviour has on moisture dynamics of buildings envelopes after …
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Development of a Novel Statistical Method and Procedure for Material Characterization and a Probabilistic Approach to Assessing the Hygrothermal Performance of Building Enclosure Assemblies
… The database provides a solid base for hygrothermal simulation and further research.</p> <p>A method was developed to derive the generic material from the material cluster comprising specific materials with similar characteristics. A novel approach was developed by using the generic …
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Moisture Safety in Wood Frame Buildings - Blind evaluation of the hygrothermal calculation tool WUFI using field measurements and determination of factors affecting the moisture safety
… European climates are investigated by using hygrothermal modeling. Traditional Swedish designs are compared to more energy-efficient designs with thicker thermal insulation, and alternative designs and important factors affecting the risk of mold growth in well-insulated wood frame …
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Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites
… of carbon-fiber/epoxy composite under hygrothermal exposure and applied tensile stress. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures, viz., hot/dry, hot/wet, cold/dry, and cold/wet. Short term tests were performed to determine …
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Moisture safety in wood frame walls : blind evaluation of the hygrothermal calculation tool WUFI 5.0 using field measurements and determination of factors affecting the moisture safety
… European climates are investigated by using hygrothermal modeling. Traditional Swedish walls with insulation thicknesses of 220 mm are then compared to walls with thicker thermal insulation and alternative designs. In general the comparisons of measured and blindly calculated values show a …
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Measurement of interior green space and its impact on indoor environmental quality
… and to evaluate the effects of indoor plants on hygrothermal comfort in naturally ventilated and air-conditioned office environments. In the first part of this thesis I developed an Interior Green View Index to rapidly measure interior greenery. This method is based on capturing and classifying …
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Linear and Nonlinear Viscoelastic Characterization of Proton Exchange Membranes and Stress Modeling for Fuel Cell Applications
… properties of a PEM are important for making hygrothermal stress predictions in the cyclic temperature and humidity environment of operating fuel cells. In this study, Nafion® NRE 211, Gore-Select® 57, and Ion Power® N111-IP were characterized under various humidity and temperature conditions. …
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EARTH & FIBERS. Local Technologies Earthen Composites (LoTEC). Local reuse of by-products for zero-waste building materials. Appropriate building solutions in vernacular and contemporary architecture.
… from Europe and Latin America document the hygrothermal logic and cultural intelligence of traditional earth-and-fiber systems. Laboratory analyses characterize local raw materials (soils and vegetal residues), leading to the formulation and testing of new earthen composites. Their physical, …
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Physical, Mechanical and Chemical Aging of Polyurea Nanocomposites
… work. Selective composites are subject to hygrothermal cycling and ultraviolet (UV) radiation and stabilities studies for long durations. The severity of the effect of these exposures are measured in terms of the tensile strength of composites at predetermined time intervals. Change in the …
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The Improvement of Interfacial Bonding, Weathering and Recycling of Wood Fibre Reinforced Polypropylene Composites
… of fibre contents, fibre length, fibre beating, hygrothermal ageing and recycling were carried out with bleached Kraft fibre. MAPP contents of 1, 2, 3, 4, 5, 7 and 10 wt% were used in Kraft fibre reinforced PP composites, and 3-5 wt% was found to be most favourable. Composite fibre content was …
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