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Articles 31 - 60 of 254
Full-Text Articles in Physics
An Experimental And Modelling Study On The Adsorption Characteristics Of Activated Carbon Under Different Challenge Concentration Levels, Chuan He, Jingjing Pei, Jensen Zhang
An Experimental And Modelling Study On The Adsorption Characteristics Of Activated Carbon Under Different Challenge Concentration Levels, Chuan He, Jingjing Pei, Jensen Zhang
International Building Physics Conference 2018
Applying air cleaning devices is an effective approach to control targeted indoor gaseous pollutants. It is important to understand the adsorption characteristics of filter media (e.g, activated carbon) at typical indoor application conditions as well as standard test conditions. Tests per ASHRAE Standard 145.1 for filter media performance evaluation can provide a relative comparison among different media. However, as the tests are conducted at elevated gas concentrations (1~100 ppm), they do not represent the media performance under lower concentrations typical of indoor applications (
Development Of A Procedure For Estimating The Parameters Of Mechanistic Emission Source Models From Chamber Testing Data, Zhenlei Liu, Andreas Nicolai, Marc Abadie, Menghao Qin, Jensen Zhang
Development Of A Procedure For Estimating The Parameters Of Mechanistic Emission Source Models From Chamber Testing Data, Zhenlei Liu, Andreas Nicolai, Marc Abadie, Menghao Qin, Jensen Zhang
International Building Physics Conference 2018
In order to evaluate the impacts of volatile organic compounds (VOCs) emissions from building materials on the indoor pollution load and indoor air quality beyond the standard chamber test conditions and test period, mechanistic emission source models have been developed in the past. However, very limited data are available for the required model parameters including the initial concentration (Cm0), in-material diffusion coefficient (Dm), partition coefficient (Kma), and convective mass transfer coefficient (km). In this study, a procedure is developed for estimating the model parameters by using VOC emission data from standard small chamber tests. Multivariate regression analysis on the experimental …
Evaluation Of The Physical Interpretability Of Calibrated Building Model Parameters, Sarah Juricic, Simon Rouchier, Aurélie Foucquier, Gilles Fraisse
Evaluation Of The Physical Interpretability Of Calibrated Building Model Parameters, Sarah Juricic, Simon Rouchier, Aurélie Foucquier, Gilles Fraisse
International Building Physics Conference 2018
Identifying building envelope thermal properties from the calibration of a lumped model raises identifiability issues. Not only needs the simplified model to be structurally identifiable, i.e. deliver unique estimates after calibration, but also the data used might not be informative enough to result in either or both accurate estimates and physically interpretable values. This could particularly be the case when data is extracted from non intrusive in situ measurements, in the sense not disturbing potential occupancy. In this frame, this paper develops a method to investigate the physical interpretation of the parameters of lumped models through a numerical tests procedure. …
Field Experimental Investigation Of Temperature, Humidity And Solar Radiation Impacts On Formaldehyde Emission From Interior Furnishing Material (Particle Board): A Preliminary Study, Alula Yadete, Fitsum Tariku, Doug Horn
Field Experimental Investigation Of Temperature, Humidity And Solar Radiation Impacts On Formaldehyde Emission From Interior Furnishing Material (Particle Board): A Preliminary Study, Alula Yadete, Fitsum Tariku, Doug Horn
International Building Physics Conference 2018
Some part of indoor space components such as furniture and surfaces (like walls and floor carpet) contains contaminants and emit them over time. The emission is affected by different environmental factors like temperature, relative humidity, and solar radiation. As a result, three field experiments are conducted to assess the impact of these environmental factors on Formaldehyde emission. This study referred to previous literature on measuring volatile compound emission from wood stain using balance scale. Consequently, a similar test setup (balance scale) is adopted to investigate formaldehyde emission from test sample which is exposed to solar radiation in fully controlled test …
Study On Improving The Surface Wet Condition Of Subfloor By Hygroscopic Material In Rural Residences Of China, Jinzhong Fang, Mingfang Tang, Lin Jiang, Dongfang Lai
Study On Improving The Surface Wet Condition Of Subfloor By Hygroscopic Material In Rural Residences Of China, Jinzhong Fang, Mingfang Tang, Lin Jiang, Dongfang Lai
International Building Physics Conference 2018
Microporous surface materials are put forward to prevent condensation on subfloor in some building design standards and specifications in China. However, in the current study there are mostly applied cases, lacking of quantitative research. This paper simulated and compared the surface wet condition of three different surface materials by WUFI software: solid brick, hardwood and glazed tile brick. The results shows that the time on surface relative humidity that above 95%, hygroscopic subfloor reduces by more than 20% over non-hygroscopic subfloor, and the improvement is over 45% in relative humidity range of 99% to 100%. In high-humidity areas such as …
The Application Of Computed Tomography For Characterising The Pore Structure Of Building Materials, Steven Claes, Wouter Van De Walle, Muhammad Islahuddin, Hans Janssen
The Application Of Computed Tomography For Characterising The Pore Structure Of Building Materials, Steven Claes, Wouter Van De Walle, Muhammad Islahuddin, Hans Janssen
International Building Physics Conference 2018
Flow and transport phenomena in porous media play a significant role in various fields of science and technology, comprising a spectrum from medical sciences over material sciences to soil and rock sciences. Also in building materials, the transfer of moisture and heat play a crucial role when assessing their properties and performances. Hence, three-dimensional analyses of the pore structure of building materials are becoming progressively more important in recent years, to obtain more accurate interpretations and simulations of their characteristics. Computed tomography has proven to be an excellent and versatile tool to perform these analyses non-destructively. The reconstruction of the …
Humans And Nature In The Loop: Integrating Occupants & Natural Conditioning Into Advanced Controls For High Performance Buildings, Vivian Loftness, Azizan Aziz, Volker Hartkopf, Khee Poh Lam, Bertrand Lasternas
Humans And Nature In The Loop: Integrating Occupants & Natural Conditioning Into Advanced Controls For High Performance Buildings, Vivian Loftness, Azizan Aziz, Volker Hartkopf, Khee Poh Lam, Bertrand Lasternas
International Building Physics Conference 2018
Post Occupancy Evaluation plus Measurements (POE+M) has revealed that thermal, visual, acoustic and even air quality standards derived through controlled experimentation alone does not ensure comfort or health in buildings. Introducing human input into environmental standards and into user centric controls is critically needed for a sustainable future. For over a decade, CMU’s Center for Building Performance & Diagnostics has been gathering POE+M data from over 1500 workstations around the world and testing the benefits on innovative environmental control systems. The separation of ambient and task conditioning, the provision of task controls, the introduction of occupant voting and bio-signal inputs …
Dynamic Environment, Adaptive Comfort, And Cognitive Performance, Richard De Dear, Fan Zhang
Dynamic Environment, Adaptive Comfort, And Cognitive Performance, Richard De Dear, Fan Zhang
International Building Physics Conference 2018
Since the invention of airconditioning over 100 years ago a central research challenge has been to define the indoor environmental temperatures best suited for occupants. The first scientific approach to this question was framed in terms of optimising occupant thermal comfort, commonly expressed as a U-function, symmetrical around a single optimum temperature for any given combination of the remaining comfort parameters (ISO, 2005). The inescapable conclusion drawn from such logic in the minds of risk-averse design engineers is that the only strategy able to reliably deliver occupant comfort is HVAC applied to sealed-façade architecture. A rigorous scientific rebuttal of the …
A Comparison Of Model Order Reduction Methods For The Simulation Of Wall Heat Transfer, Tianfeng Hou, Staf Roels, Hans Janssen
A Comparison Of Model Order Reduction Methods For The Simulation Of Wall Heat Transfer, Tianfeng Hou, Staf Roels, Hans Janssen
International Building Physics Conference 2018
In this paper, the potential of model order reduction for simulating building performance is assessed, via a case study of modelling heat transfer through a massive masonry wall. Two model order reduction techniques – proper orthogonal decomposition and proper generalized decomposition – are investigated and compared. Moreover, to illustrate the performance of model order reduction techniques, the accuracies of the two model order reduction techniques are respectively compared with a standard finite element method. The outcomes show that both of the two model order reduction techniques are able to provide an accurate result, and the proper generalized decomposition tends to …
A Framework For Comfort Assessment In Buildings And Districts Retrofit Process, Marco Arnesano, Federica Naspi, Livia Claudi, Gian Marco Revel
A Framework For Comfort Assessment In Buildings And Districts Retrofit Process, Marco Arnesano, Federica Naspi, Livia Claudi, Gian Marco Revel
International Building Physics Conference 2018
The retrofit design of buildings and districts cannot exclude the occupants’ perspective if comfortable and healthy conditions have to be obtained. For this reason, the NewTREND1 project developed a collaborative platform for the energy efficient buildings and districts retrofit that includes the users’ perspective. Three modules have been developed for thermal comfort, acoustic comfort and behavioural assessment. These modules are integrated into a Simulation and Design Hub that, after gathering data from on-site measurements, builds a simulation model of the district, calculates yearly results and exposes them to the design team through a dedicated District Information Model server and user …
A Rain Simulator To Examine Green Roof And Soil Moisture Sensor Performance, Endla S. Feustel, Yige Yang, Cliff I. Davidson
A Rain Simulator To Examine Green Roof And Soil Moisture Sensor Performance, Endla S. Feustel, Yige Yang, Cliff I. Davidson
International Building Physics Conference 2018
Green roof technology plays a large role managing stormwater runoff in urban areas, where impervious surfaces cause substantial amounts of stormwater runoff to enter combined sewer systems. If the stormwater flow exceeds the capacity of treatment plants, this often results in the discharge of raw sewage into nearby bodies of water. Green roofs can reduce the occurrence of raw sewage discharge by decreasing the amount of mixed wastewater and stormwater flowing into combined sewers. Engineers and designers are looking for ways to improve the performance of green roofs and to understand parameters such as field capacity and time to onset …
A Study On Natural Lighting Design Strategies For Teaching Buildings In Hot-Summer And Cold-Winter Zone Of China—A Case Of The Arts And Sciences Building Of Xinyang Normal University, Xinyue Yang, Jiehui Wang, Juanli Guo
A Study On Natural Lighting Design Strategies For Teaching Buildings In Hot-Summer And Cold-Winter Zone Of China—A Case Of The Arts And Sciences Building Of Xinyang Normal University, Xinyue Yang, Jiehui Wang, Juanli Guo
International Building Physics Conference 2018
The natural lighting of buildings plays an important role in creating a comfortable indoor light environment and reducing the energy consumption of artificial lighting. Teaching buildings have special requirements for the indoor light environment. Classroom glare, corridor backlit, and low natural illumination in corridor are light pollution problems easily appear in teaching building, which cannot be ignored in the design of teaching building. Regarding the issues above, the paper took the Arts and Sciences Building of Xinyang Normal University as an example, through the architectural modeling, space forms, facade effects and other features, used VELUX simulation software to simulate the …
Analysis Of Thermal Bridges In Insulated Masonry Walls: A Comparison Between Vacuum Insulated Panels And Expanded Polystyrene, Adrian Bucur, Ligia Moga
Analysis Of Thermal Bridges In Insulated Masonry Walls: A Comparison Between Vacuum Insulated Panels And Expanded Polystyrene, Adrian Bucur, Ligia Moga
International Building Physics Conference 2018
The paper presents a comparative study between the thermal performances of a couple of masonry walls with no insulation and then insulated with vacuum insulation panels and expanded polystyrene. The research purpose is to demonstrate the superior thermal performance of the vacuum insulation panels compared to common thermal insulation, in initial state and even after 25 years in service. It also provides the steps to determine the effective thermal resistance of the buildings elements insulated with vacuum insulation panels, considering both local and geometric thermal bridges. Results emphasize that even after 25 years in use, the walls insulated with vacuum …
Assessment Of The Bipv Potential At The City Of Prague And Their Effect On The Built Environment, Nikolaos Skandalos, Jan Tywoniak, Kamil Stanek, Lenka Maierova
Assessment Of The Bipv Potential At The City Of Prague And Their Effect On The Built Environment, Nikolaos Skandalos, Jan Tywoniak, Kamil Stanek, Lenka Maierova
International Building Physics Conference 2018
This work highlights the BIPV potential in two urban areas with different characteristics at the city of Prague. Representative building blocks were selected and CitySim software tool was used for the assessment of the hourly irradiation profiles on each surface over one year period. Considering appropriate irradiation thresholds, suitable surfaces were then quantified. Integration criteria are discussed and suitable BIP V applications are proposed considering not only energy performance but also their impact on the quality of built environment. Results indicated that only 5.5% of the total area can be used in Vinohrady and 13.7% in Jizni Mesto contributing on …
Chemical Analysis Of Precipitation And Stormwater Runoff From A Large Green Roof, Kimberly Fitzgerald, Alexander Johnson, Cliff I. Davidson
Chemical Analysis Of Precipitation And Stormwater Runoff From A Large Green Roof, Kimberly Fitzgerald, Alexander Johnson, Cliff I. Davidson
International Building Physics Conference 2018
The growth medium of a green roof is likely to affect the chemistry of the rainwater passing through it, which may impact the receiving waters. Currently only limited data exist on the changes in rain chemistry caused by green roofs. The objectives of this project are to determine the differences in concentration of several contaminants in rain and in runoff from a green roof in downtown Syracuse, NY, and to explore reasons for the observed differences. A few samples were collected in 2014 and 2016, but most of the data are from 2017. Collection of precipitation uses funnels, while collection …
Building Information Modeling (Bim) Implementation For Sustainability Analysis: A Mega Airport Project Case Study, Basak Keskin, Baris Salman
Building Information Modeling (Bim) Implementation For Sustainability Analysis: A Mega Airport Project Case Study, Basak Keskin, Baris Salman
International Building Physics Conference 2018
It has been generally perceived that decision-making processes for implementing sustainable solutions to building elements should be in design and pre-construction phases. This perception hinders the transformation of current non-sustainable buildings into sustainable ones. It has been realized that retrofitting existing buildings can be more beneficial in terms of time and cost compared to new construction. This study aims to show that implementation of Building Information Modeling (BIM) for energy analysis improves the retrofit planning process. This study explains that in practice, BIM tools provide significant opportunities for creation of Building Energy Modeling (BEM); and the outputs of BEM analysis …
Bio-Inspired Outdoor Systems For Enhancing Citizens Thermal Comfort In Public Spaces By Learning From Nature, Marta Chafer, Cristina Piselli, Anna Laura Pisello, Ilaria Pigliautile, Gabriel Perez, Luisa F. Cabeza
Bio-Inspired Outdoor Systems For Enhancing Citizens Thermal Comfort In Public Spaces By Learning From Nature, Marta Chafer, Cristina Piselli, Anna Laura Pisello, Ilaria Pigliautile, Gabriel Perez, Luisa F. Cabeza
International Building Physics Conference 2018
In the last decades a variety of high-energy efficient solutions for building envelopes were developed and tested for enhancing indoor thermal comfort and improving indoor environmental quality of private spaces by learning from nature. To this aim, adaptive solutions, conceived thanks to green and bio inspiration, were designed and constructed in various climate conditions and for a variety of building uses. Given the huge population flow toward urban areas, well-being conditions in the public spaces of such dense built environment are being compromised, also due to anthropogenic actions responsible for massive environmental pollution, local overheating, urban heat island, etc. Moreover, …
Computational Evaluation Of The Thermal Performance Of Underground Bunkers: The Case Of Albania, Rudina Breçani, Sokol Dervishi
Computational Evaluation Of The Thermal Performance Of Underground Bunkers: The Case Of Albania, Rudina Breçani, Sokol Dervishi
International Building Physics Conference 2018
The present paper studies the thermal and energy performance and potential adaptive reuse of the lost underground bunkers of Kukës, Albania. The approach is exemplified using a 150-m long cross-section of the underground network selected for the parametric computational simulations. Data regarding local climate, design typology, and building materials is used to generate a finite-element simulation model of the underground tunnels. Different scenarios including insulation of the outer walls, occupancy patterns, and ventilation regimes are tested. The results show that indoor air temperature ranges from 15-18°C during winter and 23-28°C during summer. During January, the temperatures are higher by 3-5 …
Elaboration Of The Decision Space For An Optimization Of Building Retrofit, Yannis Merlet, Simon Rouchier, Arnaud Jay, Monika Woloszyn
Elaboration Of The Decision Space For An Optimization Of Building Retrofit, Yannis Merlet, Simon Rouchier, Arnaud Jay, Monika Woloszyn
International Building Physics Conference 2018
Multiobjective optimization is widely used in building physics but it has to face construction and regulation constraints to elaborate feasible solutions. This paper investigate how to integrate constraints in genetic optimization carried out with NSGA2 algorithm: it studies the implementation of constraints in the decision space and its impact on convergence speed and diversity in the optimization. The study was carried out on a 8 appartments building with three objective function to optimize: energy demand, comfort of the tenants and economic cost. As a result, convergence speed was improved and expert knowledge was included inside the decision space in a …
Criteria For Identifying Failure Optimization Algorithms In Building Energy Optimization And Case Studies, Binghui Si, Xing Shi
Criteria For Identifying Failure Optimization Algorithms In Building Energy Optimization And Case Studies, Binghui Si, Xing Shi
International Building Physics Conference 2018
Optimization algorithms plays a vital role in the Building Energy Optimization (BEO) technique. Although many algorithms are currently used in BEO, it is difficult to find an algorithm that performs well for all optimization problems. Some algorithms may fail in some cases. This study specifically focuses on failure algorithms in BEO and the possible causes. Several criteria are proposed for identifying failure algorithms. Four optimization problems base d on the DOE small and large office buildings are developed. Three commonly used algorithms in BEO, namely, Pattern Search (PS ) algorithm, Genetic Algorithm (GA ) and Particle Swarm Optimization (PSO) algorithm, …
Effects Of Gaseous Pollution And Thermal Conditions On The Corrosion Rates Of Copper And Silver In Data Centre Environment: A Literature Review, Rui Zhang, Roger Schmidt, Jeremy Gilbert, Jensen Zhang
Effects Of Gaseous Pollution And Thermal Conditions On The Corrosion Rates Of Copper And Silver In Data Centre Environment: A Literature Review, Rui Zhang, Roger Schmidt, Jeremy Gilbert, Jensen Zhang
International Building Physics Conference 2018
The objectives of the present review are to: 1) summarize the existing knowledge on the mechanisms of the corrosion, identify and analyze the major factors affecting the corrosion of copper and silver; 2) compare various measurement techniques for the study of atmospheric corrosion and models of corrosion; 3) identify knowledge gaps for atmospheric corrosion; 4) recommend “realistic worst case” pollution levels for laboratory testing of humidity and temperature effects on corrosion and assessment of datacom equipment reliability in data centers. This review focuses on the five pollutants: SO2, NO2, H2S, O3 and Cl2. Results of the review include: the pollution …
Estimating Time Constants For Over 10,000 Residential Buildings In North America: Towards A Statistical Characterization Of Thermal Dynamics, Camille John, Charalampos Vallianos, José Candanedo, Andreas Athienitis
Estimating Time Constants For Over 10,000 Residential Buildings In North America: Towards A Statistical Characterization Of Thermal Dynamics, Camille John, Charalampos Vallianos, José Candanedo, Andreas Athienitis
International Building Physics Conference 2018
Understanding the dynamic response of a building is essential in the design of sustainable energy-efficient buildings. Using data from over 10,000 smart thermostats, this study identifies patterns in the dynamic thermal response of residential buildings in Canada and the United States (US). The data set consists of one year of measurements recorded at 5-minute intervals for the indoor and outdoor air temperature as well as HVAC equipment run times. This study focuses on identifying effective values of time constants for the houses by applying the following procedure. First, periods complying with the following basic criteria are identified: a) the house …
Experimental Investigation Of The Impact Of Pcm Containment On Indoor Temperature Variations, Iva Rešetar, Norbert Palz
Experimental Investigation Of The Impact Of Pcm Containment On Indoor Temperature Variations, Iva Rešetar, Norbert Palz
International Building Physics Conference 2018
In view of growing concerns on climate change and temperature extremes, there is a need to explore novel methods that provide thermal comfort in architecture. Latent heat thermal energy storage with phase change materials (PCM) has been widely researched in last decades in the field of energy technology and proved beneficial for reduction and shifting of the thermal loads and improving the overall thermal storage capacity of building components. Although a variety of PCM containments have been investigated for indoor cooling applications, the examples of exposed, design-oriented macro-encapsulations are rare. This paper presents a study of visible, suspended ceiling encapsulations …
Hygrothermal Modelling Of Building Enclosures: Reference Year Design For Moisture Accumulation And Condensation Risk Assessment, Michele Libralato, Giovanni Murano, Onorio Saro, Alessandra De Angelis, Vincenzo Corrado
Hygrothermal Modelling Of Building Enclosures: Reference Year Design For Moisture Accumulation And Condensation Risk Assessment, Michele Libralato, Giovanni Murano, Onorio Saro, Alessandra De Angelis, Vincenzo Corrado
International Building Physics Conference 2018
Interstitial condensation and water accumulation risk in building envelopes could be assessed with methods and models base d on moisture migration through porous media coupled to heat transfer. One of the difficulties in evaluating the boundary conditions for the heat and mass transfer model is the choice of an appropriate weather file. The most advanced models, described by the standard EN 15026:2007, require the hourly values of rain, wind, radiation, temperature and relative humidity to compute the water content in the porous materials. In this contribution, the method described by the standard EN ISO 15927-4:2005, typically used to design Moisture …
Hygrothermal Performance Of Historic Massive Wall: When Is 2d Simulation Necessary?, Dario Bottino Leone, Marco Larcher, Alexandra Troi, John Grunewald
Hygrothermal Performance Of Historic Massive Wall: When Is 2d Simulation Necessary?, Dario Bottino Leone, Marco Larcher, Alexandra Troi, John Grunewald
International Building Physics Conference 2018
Hygrothermal analysis of historical building envelopes is crucial in ensuring their durability and enhancing their performances. The use of hygrothermal dynamic simulation is the most effective approach to predict moisture related damages or risk of mould growth on ancient masonry envelopes. However, simulating the hygrothermal behaviour of a historic wall composed by stones or bricks and mortar joints, with a detailed two-dimensional (2D) model, is typically a complex and time-consuming process. For this reason, in numerical models, composite walls are often simplified with a one-dimensional (1D) layer, neglecting the mortar joints. An oversimplified numerical model could affect the evaluation of …
Innovative Composite Materials With Enhanced Acoustic, Thermal, And Optical Performance For Urban Pavements: Experimental Characterization, Verronica Lucia Castaldo, Claudia Fabiani, Anna Laura Pisello, Franco Cotana
Innovative Composite Materials With Enhanced Acoustic, Thermal, And Optical Performance For Urban Pavements: Experimental Characterization, Verronica Lucia Castaldo, Claudia Fabiani, Anna Laura Pisello, Franco Cotana
International Building Physics Conference 2018
Over the last decades, the implementation of innovative multifunctional materials for urban surfaces has produced a variety of paving solutions characterized by self-cleaning, self-healing, electricity conductive, solar reflective, sound absorbent properties and so on. Therefore, a key challenge is nowadays represented by the need for combining multi-physics properties in a single material or system for flooring. The present work concerns the development of a new outdoor paving application with enhanced acoustic, thermal, and optical performance. To this aim, eleven concrete mix-designs were tested. The composites were characterized by different aggregate size, material and additives. The aggregates included in the composite …
Optical Performance Of Polycarbonate Multi-Wall Panels In The Form Of Transparent Insulation Based On Long-Term Outdoor Measurements, Miroslav Čekon
Optical Performance Of Polycarbonate Multi-Wall Panels In The Form Of Transparent Insulation Based On Long-Term Outdoor Measurements, Miroslav Čekon
International Building Physics Conference 2018
Buildings are subject to strongly time variable solar radiation impacts, which are phenomena that typically occur at a characteristic timescale resolution. Recent technologies and advances which are currently being used to produce polycarbonate-based materials may be used in applications where it is useful to activate the solar transmittance functions of building envelopes. In general, systems utilizing polycarbonate as a type of transparent insulation material exhibit the thermal performance of standard glazing systems. This study is focused on the optical characterization of several polycarbonate panels for buildings that are based on different numbers of chambers and differing geometries. The optical performance …
Intrinsic Evaporative Cooling With Natural Ventilation And Shading For Adaptive Thermal Comfort In Tropical Buildings, Mae-Ling Lokko, Alexandra Rempel
Intrinsic Evaporative Cooling With Natural Ventilation And Shading For Adaptive Thermal Comfort In Tropical Buildings, Mae-Ling Lokko, Alexandra Rempel
International Building Physics Conference 2018
Hygroscopic materials, including earth- and plant-based materials used in tropical vernacular architecture, often sorb significant moisture from the atmosphere during humid nighttime hours; evaporation the following day then provides a pronounced cooling effect, particularly in semi-arid regions. While such intrinsic evaporative cooling is also active in wet-tropical climates, it cannot maintain indoor comfort, and vernacular structures are highly open to facilitate air movement. Recently, new hygroscopic materials have been developed from coconut agricultural wastes that show great potential for intrinsic evaporative cooling and indoor humidity control in contemporary tropical buildings. As expected, however, they must be combined with additional cooling …
Long Term Measurements And Ham Modelling Of An Interior Insulation Solution For An Office Building In Cold Climate, Paul Klõšeiko, Targo Kalamees
Long Term Measurements And Ham Modelling Of An Interior Insulation Solution For An Office Building In Cold Climate, Paul Klõšeiko, Targo Kalamees
International Building Physics Conference 2018
Excessive mould damage was detected in an office building in Northern Europe and thus a renovation need was established. This paper studies a renovation solution using measurements and heat, air & moisture (HAM) modelling. Polyurethane (PUR) foam was used to fill the air gap in masonry while capillary active calcium silicate (CaSi) insulation was used on the interior surface at thermal bridges. During renovation works temperature and relative humidity (t&RH) and heat flux sensors were installed throughout the wall. Nearly 3 years of measurements are presented. Average thermal transmittance (U) of the wall was reduced around 3 times. While the …
Roof Windows For Passive Houses – What Can Be Improved?, Jan Tywoniak, Kamil Staněk, Vítězslav Calta
Roof Windows For Passive Houses – What Can Be Improved?, Jan Tywoniak, Kamil Staněk, Vítězslav Calta
International Building Physics Conference 2018
In general, skylights and roof windows in pitched roofs ca n be described as the critical components of buildings concerning heat losses, risk of surface condensation, increased risk of overheating of rooms behind etc. This is very sensible task especially for passive house solutions. The paper informs about studies analyzing the importance of these relatively small areas in the building envelope and more detailed in pitched roof of a passive house. One of the key problems is the position of roof window within the pitched roof construction. Second part of the paper comments results of detailed analysis of thermal performance …