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2018

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Articles 2401 - 2430 of 13646

Full-Text Articles in Physical Sciences and Mathematics

Using Rain And Vegetation To Improve Thermal Comfort In A Hot Street Canyon With Fully-Integrated Urban Climate Modeling, Aytaç Kubilay, Jan Carmeliet, Dominique Derome Sep 2018

Using Rain And Vegetation To Improve Thermal Comfort In A Hot Street Canyon With Fully-Integrated Urban Climate Modeling, Aytaç Kubilay, Jan Carmeliet, Dominique Derome

International Building Physics Conference 2018

Building materials that are commonly used in urban areas generally have higher sensible heat storage and radiation entrapment, while having lower moisture storage and evapotranspiration, in comparison to the materials found in rural areas. These differences play a significant role in the occurrence of the urban heat island (UHI) effect, which has adverse impacts on thermal comfort, energy use and public health. Coupled numerical simulations of computational fluid dynamics (CFD) with the heat and mass transfer (HAM) in porous urban materials are performed to estimate the evaporative-cooling potential of different pavements in a street canyon. The local thermal comfort following …

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Towards Human-Centred Intelligent Envelopes: A Framework For Capturing The Holistic Effect Of Smart Façades On Occupant Comfort And Satisfaction, Alessandra Luna-Navarro, Mauro Overend Sep 2018

Towards Human-Centred Intelligent Envelopes: A Framework For Capturing The Holistic Effect Of Smart Façades On Occupant Comfort And Satisfaction, Alessandra Luna-Navarro, Mauro Overend

International Building Physics Conference 2018

Intelligent buildings have the potential to simultaneously revolutionise the way humans live and reduce energy demand in buildings. In particular, the so-called, smart / dynamic / adaptive building envelope can selectively modulate the energy transfer between the building and its environment in response to transient outdoor conditions and indoor requirements, thereby providing a low-carbon means of achieving occupant satisfaction and well-being. However, the effect of smart facades on holistic occupant comfort and satisfaction with the environment is yet to be fully captured and quantified. This information is essential for evidence-based design and control of smart building envelopes. In this paper, …

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Occupants’ Perception Of Historical Buildings’ Indoor Environment. Two Case Studies., Giorgia Spigliantini, Valentina Fabi, Marcel Schweiker, Stefano Paolo Corgnati Sep 2018

Occupants’ Perception Of Historical Buildings’ Indoor Environment. Two Case Studies., Giorgia Spigliantini, Valentina Fabi, Marcel Schweiker, Stefano Paolo Corgnati

International Building Physics Conference 2018

In Europe, some historical cities have more than 50% of buildings dated from before 1920. Nowadays, these buildings faces challenges when adapted to the current necessities of livability, environmental and economical sustainability. Literature demonstrates that occupants’ comfort perception and consequent behavior affect buildings’ energy efficiency and are influenced also by the building configuration. Despite a large number of studies in literature investigating occupants’ behavior and comfort in different situations, there is a lack of such studies for historical buildings. Therefore, the objective of this paper was to characterize occupants’ thermal and comfort perception in two historical buildings during summer season. …

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Hygrothermal Performance Assessment Of Wall Systems With Various Concrete And Insulation Configurations, Ali Vaseghi, Fitsum Tariku Sep 2018

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 …

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Numerical Investigation Of A Diffuse Ventilation Ceiling System For Buildings With Natural And Hybrid Ventilation, Alessandro Nocente, Francesco Goia, Steinar Grynning Sep 2018

Numerical Investigation Of A Diffuse Ventilation Ceiling System For Buildings With Natural And Hybrid Ventilation, Alessandro Nocente, Francesco Goia, Steinar Grynning

International Building Physics Conference 2018

The need to meet requirements, both in terms of ventilation and thermal comfort in modern buildings, has led to the development of different concepts for ventilation, among which the so-called Diffuse Ceiling Ventilation (DCV). This system makes use of the space between the ceiling slabs and the suspended ceiling as a plenum for fresh air, while the suspended ceiling itself becomes an air diffuser element. If compared to traditional solutions, this allows a higher amount of ventilation air to be injected in the room at lower speed, and a more even distribution of the fresh air within the room. Furthermore, …

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A Sustainable Approach To The Adaptive Reuse Of Historic Brick Buildings:Analysis Of Energy Efficiency Strategies For Historic Facade Retrofits, Donghwan Kim, Juliana Felkner Sep 2018

A Sustainable Approach To The Adaptive Reuse Of Historic Brick Buildings:Analysis Of Energy Efficiency Strategies For Historic Facade Retrofits, Donghwan Kim, Juliana Felkner

International Building Physics Conference 2018

There are many historic brick buildings in downtown areas of the U.S. that are awaiting appropriate strategies for their adaptive reuse and preservation. The adaptive reuse method enables the adaptation of existing, obsolete historic buildings into new, mixed-use developments that will play an essential role in enhancing urban environments. However, many of these buildings have poor energy performance. This paper explores sustainable methods to balance between historic preservation and reduction of peak energy loads, through analyzing design strategies and conducting energy simulations for a building in downtown, Austin, TX. Energy retrofits related to windows, high performance of the facades with …

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Preparation And Thermal Performance Of Diatomite-Based Composite Phase Change Materials Wallboard, Chaoen Li, Hang Yu, Yuan Song Sep 2018

Preparation And Thermal Performance Of Diatomite-Based Composite Phase Change Materials Wallboard, Chaoen Li, Hang Yu, Yuan Song

International Building Physics Conference 2018

Two kinds of diatomite-based composite phase change materials (the phase change temperature was 35℃ and 42℃, respectively) were prepared by incorporating organic alcohol phase change materials into diatomite to form shape-stabilized composite PCMs. Then, diatomite-based phase change wallboards were fabricated, and the wallboards were attached to the exterior surface of the wall from a test small room to study the thermal performance. In this study, we investigated the effects on the wallboards location, the type of materials and the phase transition temperature on the thermal performance of the wallboards. It was found that comparing with the traditional polystyrene plastic insulation …

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Interior Insulation Retrofit Of A Brick Wall Using Super Insulation Materials: Design Of A Field Testing In An Industrial Brick Building, Pär Johansson, Paula Wahlgren Sep 2018

Interior Insulation Retrofit Of A Brick Wall Using Super Insulation Materials: Design Of A Field Testing In An Industrial Brick Building, Pär Johansson, Paula Wahlgren

International Building Physics Conference 2018

The societal demands on a more energy efficient building stock in Sweden creates challenges to find suitable retrofitting measures. One of the measures currently discussed is to use interior insulation. This measure leads to a reduced temperature in the wall, which increases the risk for elevated moisture levels in the wall. When the thickness of the insulation layer is limited, super insulation materials (SIM) may be used. SIM can be divided into advanced porous materials, such as aerogel blankets (AB), and vacuum insulation panels (VIP). Often moisture from the outside is the major moisture source why a solution may be …

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Integrated Vegetation Model For Studying The Cooling Potential Of Trees In Urban Street Canyons, Lento Manickathan, Aytaç Kubilay, Thijs Defraeye, Jonas Allegrini, Dominique Derome, Jan Carmeliet Sep 2018

Integrated Vegetation Model For Studying The Cooling Potential Of Trees In Urban Street Canyons, Lento Manickathan, Aytaç Kubilay, Thijs Defraeye, Jonas Allegrini, Dominique Derome, Jan Carmeliet

International Building Physics Conference 2018

Vegetation in cities provides natural cooling of the climate and is therefore increasingly integrated as an essential part of Urban Heat Island (UHI) mitigation strategies. In the present study, the influence of trees on the local climate in a street canyon is studied using an integrated vegetation model in OpenFOAM. Vegetation is modeled as porous medium providing the necessary source terms for the heat, mass and momentum fluxes. Additionally, a radiation model is developed to model the short-wave and long-wave radiative heat flux exchanges between vegetation and the surroundings. The study investigates the influence of transpirative and shaded cooling due …

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Conserving Energy, Conserving Buildings: Airtightness Testing In Historic New England Homes, David Fannon, Jamaica Reese-Julian Sep 2018

Conserving Energy, Conserving Buildings: Airtightness Testing In Historic New England Homes, David Fannon, Jamaica Reese-Julian

International Building Physics Conference 2018

As a location of early European settlement, New England enjoys a wealth of historic buildings, which represent a rich cultural heritage and insight into New England life. Their longevity also offers the opportunity to identify the characteristics of long-lasting buildings, and to guide design for the historic buildings of the future. Old buildings are inherently sustainable; both because of abstract ideas like “embodied energy” but also by sustaining history and culture over time. This study combines field methods from vernacular architecture (a branch of material culture studies) and building science (which exists between architecture and engineering) to conduct detailed investigations …

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Field Occupants’ Behavior Monitoring Integrated To Prediction Models: Impact On Building Energy Performance, Cristina Piselli, Ilaria Pigliautile, Anna Laura Pisello Sep 2018

Field Occupants’ Behavior Monitoring Integrated To Prediction Models: Impact On Building Energy Performance, Cristina Piselli, Ilaria Pigliautile, Anna Laura Pisello

International Building Physics Conference 2018

Given the massive scientific progress on passive and active solutions to reach near-zeroenergy targets, the necessity to consider occupants’ behavior as a key variable affecting field energy performance of buildings has become a crucial issue to face. In this panorama, a variety of deterministic and stochastic models, also supported by experimental investigations have been developed in the last decade. This paper builds upon previous contributions to analyze the real occupancy of an office building populated by peers’ offices monitored for 2 years by means of microclimate and energy-need field stations. After demonstrating that the peers do not behave the same …

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Modeling And Spatial Visualization Of Indoor Micro-Climates For Personalized Thermal Comfort, Berardo Matalucci, Joshua Draper, Anna Dyson Sep 2018

Modeling And Spatial Visualization Of Indoor Micro-Climates For Personalized Thermal Comfort, Berardo Matalucci, Joshua Draper, Anna Dyson

International Building Physics Conference 2018

The indoor thermal environment is conventionally considered homogeneous as anchored on a universal thermal comfort paradigm, although occupants’ experience is often diversified and influenced by several physio-cognitive factors. Personal comfort devices aim to enhance thermal comfort acceptance through localized heating and cooling while reducing overall energy consumption as temperature set-points of centralized HVAC systems can be relaxed. To further incentivize the adoption of distributed HVAC systems, it is critical to examine the energy benefits and the spatial characteristics of heterogeneous thermal environments. Here we developed a parametric framework based on building energy modeling coupled with a spatial visualization of micro-climatic …

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Design And Operational Strategies For Good Indoor Air Quality In Low-Energy Dwellings: Performance Evaluation Of Two Apartment Blocks In East London, Uk, Esfand Burman, Clive Shrubsole, Samuel Stamp, Dejan Mumovic, Michael Davies Sep 2018

Design And Operational Strategies For Good Indoor Air Quality In Low-Energy Dwellings: Performance Evaluation Of Two Apartment Blocks In East London, Uk, Esfand Burman, Clive Shrubsole, Samuel Stamp, Dejan Mumovic, Michael Davies

International Building Physics Conference 2018

To achieve stringent energy objectives, new dwellings are subject to energy conservation measures including low air permeability and high levels of insulation. Mechanical Ventilation with Heat Recovery (MVHR) can be used to control the balance between energy efficiency and Indoor Air Quality (IAQ) in these buildings. This paper evaluates the effectiveness of the design and operational strategies adopted in a new development comprising two apartment blocks in East London. The findings point to significant gaps in operational energy use compared against design projections, and high concentrations in benzene and formaldehyde three years after construction. It is suggested that a combination …

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Effects Of Semi-Open Space On Micro-Environmental Control, Meng Kong, Jianshun Zhang Sep 2018

Effects Of Semi-Open Space On Micro-Environmental Control, Meng Kong, Jianshun Zhang

International Building Physics Conference 2018

Semi-open space (SOS) is defined as a space semi-confined by partitions in an open space environment. Most of the previous indoor environmental researches were focused on the open space environment, while only a few of them looked into the performance of the SOS. The existence of the SOS is for providing a certain level of privacy to the occupant, but it has been reported that it significantly affects the room air distribution, hence the thermal environment and indoor air quality. The micro-environment control system is defined as a system which provides heating, cooling or ventilation to the occupant locally. In …

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Research For The Optimization Of Air Conditioner Sensor Position Based On The Room Spatial Parameter, Kuixing Liu, Gang Liu, Yueqiang Di Sep 2018

Research For The Optimization Of Air Conditioner Sensor Position Based On The Room Spatial Parameter, Kuixing Liu, Gang Liu, Yueqiang Di

International Building Physics Conference 2018

The indoor temperature measured by the sensor is an important basis of air conditioner control strategy. Accordingly, the position of the sensor influences power consumption and the stability of indoor temperature control. This paper aims to study the influence of different sensor positions on air conditioner power consumption and indoor temperature stability. An experiment is conducted, which has 20-position circumstances, including different height, horizontal distance, and vertical distance from the air conditioner. Furthermore, Fluent is used to simulate the situation that sensor is in rooms with different sizes and air conditioner direction. An optimal sensor position searching model is developed, …

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A Gis Based Methodology To Support Multi-Criteria Decision Making For The Retrofitting Process Of Residential Buildings, Kristina Orehounig, Emmanouil Thrampoulidis, Georgios Mavromatidis, Jan Carmeliet Sep 2018

A Gis Based Methodology To Support Multi-Criteria Decision Making For The Retrofitting Process Of Residential Buildings, Kristina Orehounig, Emmanouil Thrampoulidis, Georgios Mavromatidis, Jan Carmeliet

International Building Physics Conference 2018

This paper presents a workflow to support the decision making for building retrofit and building systems update at urban scale. The workflow includes i) a method to extract information from a geographical information system including information on building characteristics, building systems and building typology, ii) a method to evaluate the current and future energy demand of buildings using a dynamic building simulation tool, and iii) an updated version of the energy hub approach to evaluate best performing options in terms of energy systems update. The developed method is applied to the city of Zurich to evaluate the optimal energy system …

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A New Normative Workflow For Integrated Life-Cycle Assessment, Karen Angeles, Dimitrios Patsialis, Tracy Kijewski-Correa, Alexandros Taflanidis, Charles F. Vardeman Ii, Aimee Buccellato Sep 2018

A New Normative Workflow For Integrated Life-Cycle Assessment, Karen Angeles, Dimitrios Patsialis, Tracy Kijewski-Correa, Alexandros Taflanidis, Charles F. Vardeman Ii, Aimee Buccellato

International Building Physics Conference 2018

In order to curtail energy use by the building sector, consideration of how a "sustainable" building is constructed is paramount, in many respects, to how efficiently it operates over its lifetime. A typical building must be in use for decades before the energy expended in its daily operations surpasses the energy embodied within its initial construction, as a result of the materials used. More vitally: every building has specific vulnerabilities, particularly to hazards (e.g., earthquakes, wind, flooding) whose effects on sustainability are not explicitly considered alongside other aspects of sustainability in the design process – despite the significant environmental impact …

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Big-Open-Real-Bim Data Model - Proof Of Concept, Galina Paskaleva, Sabine Wolny, Thomas Bednar Sep 2018

Big-Open-Real-Bim Data Model - Proof Of Concept, Galina Paskaleva, Sabine Wolny, Thomas Bednar

International Building Physics Conference 2018

The goal of Building Information Modeling (BIM) is the continuous use of digital construction models from the planning stage onwards. The affected processes are iterative and involve multiple stakeholders who work at varying pace and in varying levels of detail. These stakeholders require highly specific tools based on diverging data models. To satisfy all those requirements one of the best known Open BIM implementations – IFC – offers a data model containing more than one thousand different types – from basic to highly specific. Due to its complexity, potential users must undergo prolonged training. The even bigger challenge for IFC, …

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Bim And Game Engine Integration For Operational Data Monitoring In Buildings, Yunjie Xiong, Tanyel Bulbul, Georg Reichard Sep 2018

Bim And Game Engine Integration For Operational Data Monitoring In Buildings, Yunjie Xiong, Tanyel Bulbul, Georg Reichard

International Building Physics Conference 2018

Building Information Modelling (BIM), as a new approach to the digital representation of the whole building lifecycle, including design, construction, building operation and maintenance, increases the efficiency and productivity of the architecture, engineering, and construction (AEC) industries. Because of complicated and comprehensive building information, BIM by itself is not able to provide an interactive visual environment for stakeholders and mobile access to the building information model is limited too. This paper aims to integrate BIM and 3D game engines to provide a real-time monitoring, mobile and interactive model. We’ve developed this building model as a serious game, capable of running …

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Cross-Platform, Public Domain Simulation Tools For Performing Parametric Iaq And Energy Analysis, Stuart W. Dols, Lindsay J. Underhill Sep 2018

Cross-Platform, Public Domain Simulation Tools For Performing Parametric Iaq And Energy Analysis, Stuart W. Dols, Lindsay J. Underhill

International Building Physics Conference 2018

As building design is being driven towards lower energy use, the relationship between indoor air quality (IAQ) and energy becomes more important due in large part to reduced building envelope leakage, which can lead to higher indoor pollutant levels. Simulation tools that can analyze building design measures that aim to improve IAQ and energy use are necessary for evaluating potential trade-offs involving such measures. This paper will present the use of CONTAM and EnergyPlus, coupled using co-simulation, to perform parametric analysis of IAQ and energy impacts. Both of these tools are available in the public domain and provide cross-platform methods …

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Optimization Of Four-Primary White Leds Based On Protective Effect And Color Quality-A Solution For Museum Illumination, Rui Dang, Nan Wang, Gang Liu, Huijiao Tan Sep 2018

Optimization Of Four-Primary White Leds Based On Protective Effect And Color Quality-A Solution For Museum Illumination, Rui Dang, Nan Wang, Gang Liu, Huijiao Tan

International Building Physics Conference 2018

A solution was proposed for obtaining white light-emitting-diodes (LEDs) which are suitable for illuminating traditional Chinese paintings painted with inorganic pigments (iop-TCPs) based on the requirements of protective illumination and color quality. The damage laws and degrees of 450nm, 510nm, 583nm, and 650nm monochromatic lights which can construct four-primary white LEDs on the iop-TCPs were obtained through long-term illumination experiment and data analysis by converting color coordinates into CIE DE2000 color difference values. Then we obtained the damage formula of the constructed white LEDs, which can be used to evaluate damage degree. Spectral power distributions (SPDs) of the white LEDs, …

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Experimental Investigation Of Latent Heat Thermal Energy Storage For Highly Glazed Apartments In A Continental Climate, Shahrzad Soudian, Umberto Berardi Sep 2018

Experimental Investigation Of Latent Heat Thermal Energy Storage For Highly Glazed Apartments In A Continental Climate, Shahrzad Soudian, Umberto Berardi

International Building Physics Conference 2018

The high solar heat gains in highly glazed buildings are a major thermal discomfort factor leading to higher energy consumption for space cooling. Higher window to wall ratios (WWR) also entail large temperature fluctuations due to heat loss and temperature extremes in buildings. Passive latent heat thermal energy storage (LHTES) is a potential solution to regulate the indoor thermal environment in buildings through mitigating the indoor surface temperatures. In this study, the effectiveness of phase change materials (PCMs) in the context of a highly glazed apartment unit with 80% WWR is investigated for internal wall and ceiling applications. To provide …

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Lighting Characterization Of A New Coating For Window Retrofit, Umberto Berardi Sep 2018

Lighting Characterization Of A New Coating For Window Retrofit, Umberto Berardi

International Building Physics Conference 2018

The present paper describes a new high-performance coating used for the retrofit of existing glazing systems. The easy application of this new coating on the internal side of the glazing makes possible to reduce quickly the solar heat gain coefficient of an existing window. A full laboratory characterization both from the thermal and light transmissibility point of views is presented. Moreover, the paper reports the results of long-term studies aiming at assessing the risks of aging and related performance reductions for the investigate coating.

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Monitoring And Modelling Of A Prefabricated Exterior Envelope Retrofit, Sébastien Brideau, Mark Carver, Anil Parekh, Brock Conley Sep 2018

Monitoring And Modelling Of A Prefabricated Exterior Envelope Retrofit, Sébastien Brideau, Mark Carver, Anil Parekh, Brock Conley

International Building Physics Conference 2018

As part of a larger project to develop prefabricated technologies for retrofitting building envelopes of Canadian homes, a small building was retrofitted and instrumented. This prefabricated retrofit method is intended to be applied directly over existing cladding. Two prototype retrofit wall systems were installed on the building; a nailbase panel, and a wood frame panel. The existing wall had an RSI value of 1.80 m2K/W (including film coefficients) and the resulting retrofitted walls reached values of 6.40 m2K/W and 5.72 m2K/W. With the addition of a new air barrier, blower door tests have shown a large reduction in infiltration from …

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Retrofit Of The Existing Buildings Using A Novel Developed Aerogel-Based Coating: Results From An In-Field Monitoring, Stefano Fantucci, Elisa Fenoglio, Giulia Grosso, Valentina Serra, Marco Perino, Marco Dutto, Valentina Marino Sep 2018

Retrofit Of The Existing Buildings Using A Novel Developed Aerogel-Based Coating: Results From An In-Field Monitoring, Stefano Fantucci, Elisa Fenoglio, Giulia Grosso, Valentina Serra, Marco Perino, Marco Dutto, Valentina Marino

International Building Physics Conference 2018

The energy retrofit of existing buildings and more in general building rehabilitation represents an important challenge in EU countries since a large part of their building stock is old, poorly insulated and affected by pathologies, i.e. mould growth, with relevant implications on users health other than aesthetical drawbacks. Unfortunately, the energy retrofit of existing buildings and particularly when dealing with historic buildings presents several issues, i.e. the compatibility between the identified solutions and the heritage value or the reduction of the internal space if internal solutions have to be adopted. An emerging solution to address the target of the energy …

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Comparing Exterior Wall Finishes Using Life-Cycle Assessment, Brandi Dodge, Rui Liu Sep 2018

Comparing Exterior Wall Finishes Using Life-Cycle Assessment, Brandi Dodge, Rui Liu

International Building Physics Conference 2018

Selecting products that are environmentally friendly can help reduce the negative environmental impacts associated with the built environment. However, the process can be difficult. Life-cycle assessment (LCA) is an approach used to measure the environmental performance of a product or service by considering all stages of a product’s life-cycle from extraction of raw materials to its end of life. Many products that claim to be environmentally friendly are based on a single life-cycle stage or environmental impact. These claims are often misleading as they do not consider other life-cycle stages or other environmental impacts associated with the products. This study …

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Experimental Study Of The Performance Of A Double Skin Façade Window Under Non-Solar Conditions, Jiayi Zhu, Guoqing He, Qihuan Luo, Yu Liu Sep 2018

Experimental Study Of The Performance Of A Double Skin Façade Window Under Non-Solar Conditions, Jiayi Zhu, Guoqing He, Qihuan Luo, Yu Liu

International Building Physics Conference 2018

This paper reports measured heat transfer coefficient of a double skin façade (DSF) window measured 1.1 m by 0.7 m at varied depth in the absence of solar radiation using a calorimeter box. The results showed that the DSF had better insulation than the double glazing especially with cavity closed. All the studied factors (ventilation, cavity width, and outdoor temperature) had influence on the heat transfer coefficient and such influence could be season specific. Measurements confirmed the existence of an optimal width in winter for best insulation.

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Study Of The Mechanical Behavior Of Traditional Japanese Mud Wall On Bamboo Lath, Midori Yamada, Naoyuki Koshiishi Sep 2018

Study Of The Mechanical Behavior Of Traditional Japanese Mud Wall On Bamboo Lath, Midori Yamada, Naoyuki Koshiishi

International Building Physics Conference 2018

Mud wall on bamboo lath is a traditional Japanese method for constructing walls. Although the use of mud walls is environmentally friendly, it is necessary to evaluate the performances of the walls, especially their structural resistance, for broader and safe application. However, the performances of mud walls vary widely with various factors, including the locality, the natural materials used, the construction method adopted, and the quality of workmanship. In this study, the combinations of factors expected to improve the initial stiffness and toughness of mud walls were first determined based on previous studies. Subsequently, to reveal the influences of the …

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Thermal Stability Of Lightweight Frame Partitions Exposed To Pulsed Wind Load, Piotr Kosiński, Robert Wójcik, Beata Semen Sep 2018

Thermal Stability Of Lightweight Frame Partitions Exposed To Pulsed Wind Load, Piotr Kosiński, Robert Wójcik, Beata Semen

International Building Physics Conference 2018

Much has been said about air infiltration, especially of ventilation losses and air quality. There is less information on heat losses through increased convection. This problem particularly concerns on one sided wind washing of the building envelope characterised with seeming airtightness of construction partitions. On the base of measurements undertaken in existing buildings constructed as lightweight timber structures filled with fiber materials it can be seen that air filtration also contributes to increased heat transfer through the building envelope. This paper presents the results of the research on the thermal stability of building partitions insulated with fiber materials and exposed …

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Experimental Measurements Of Human Cough Airflows From Healthy Subjects And Those Infected With Respiratory Viruses, Nicholas Dudalski Sep 2018

Experimental Measurements Of Human Cough Airflows From Healthy Subjects And Those Infected With Respiratory Viruses, Nicholas Dudalski

Electronic Thesis and Dissertation Repository

Research concerning person-to-person respiratory virus transmission is required to develop reliable, evidence-based infection prevention and control measures. Experimental studies of human coughs were comprehensively critiqued from the point of view of methodologies, aerodynamics, droplet dispersion and virology. Particle image velocimetry (PIV) and hot-wire anemometry (HWA) measurements were conducted at x=1 m away from the mouth of human subjects to develop a model for cough flow behaviour at greater distances from the mouth than those studied previously. Experiments were conducted for sick subjects who had presented with influenza-like illness, together with a cohort of healthy subjects. Biological aerosol sampling was conducted …

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