Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

2018

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 2491 - 2520 of 13646

Full-Text Articles in Physical Sciences and Mathematics

Effect Of Air Pressure On Moisture Transfer Inside Porous Building Materials Three-Dimensional Behavior Of Moisture And Air, Kazuma Fukui, Chiemi Iba, Shuichi Hokoi, Daisuke Ogura Sep 2018

Effect Of Air Pressure On Moisture Transfer Inside Porous Building Materials Three-Dimensional Behavior Of Moisture And Air, Kazuma Fukui, Chiemi Iba, Shuichi Hokoi, Daisuke Ogura

International Building Physics Conference 2018

The effect of air pressure on moisture transfer inside porous building materials cannot be ignored in cases in which air cannot escape through the surfaces of the materials; in such cases, the air is compressed by the movement of the moisture. Therefore, in a situation in which most surfaces of a specimen are sealed or treated with surface-protecting materials (a situation that is often encountered in typical water-absorption tests), the experimental results may differ from those without sealed or treated surfaces. In the present study, the influence of air pressure on moisture transfer was investigated quantitatively. First, the following water-absorption …

Go to article

Studying The Impact Of Local Urban Heat Islands On The Space Cooling Demand Of Buildings Using Coupled Cfd And Building Energy Simulations, Jonas Allegrini, Jan Carmeliet Sep 2018

Studying The Impact Of Local Urban Heat Islands On The Space Cooling Demand Of Buildings Using Coupled Cfd And Building Energy Simulations, Jonas Allegrini, Jan Carmeliet

International Building Physics Conference 2018

Surface as well as air temperatures are due to the urban heat island effect higher in urban compared to their surrounding rural areas. These increased temperatures have a strong impact on the building energy performance in urban environments and thermal comfort as well as health of inhabitants of these environments. At smaller scales, local heat islands are formed within urban environments, which have the same negative impacts. In this study, we investigate the influence of local heat islands on the space cooling demand of buildings. Commonly, climate information from one weather station is used for building performance simulations within a …

Go to article

Evaluation Of The Impact Of Phase Change Humidity Control Material On Energy Performance Of Office Buildings, Zhimin Wu, Menghao Qin, Mingjie Zhang Sep 2018

Evaluation Of The Impact Of Phase Change Humidity Control Material On Energy Performance Of Office Buildings, Zhimin Wu, Menghao Qin, Mingjie Zhang

International Building Physics Conference 2018

Phase change humidity control material (PCHCM) is a new kind of composite made of high performance PCM microcapsules and diatomite. The PCHCM composite can moderate the hygrothermal variations by absorbing or releasing both heat and moisture and significantly reduce the peak/valley values of indoor temperature and relative humidity. In this paper, a novel model is developed to evaluate the energy performance of office buildings with PCHCM. The model is validated by a series of experiments, and then applied to investigate the effect of PCHCM on energy consumption in different typical climates worldwide (i.e. Beijing, Paris, Atlanta, and Guangzhou). Results show …

Go to article

Air Cooling And Dehumidification With A Zeolite Coated Heat Exchanger Regenerated By Solar Thermal Energy, Vincenzo Gentile, Marco Simonetti, Fabio Restagno Sep 2018

Air Cooling And Dehumidification With A Zeolite Coated Heat Exchanger Regenerated By Solar Thermal Energy, Vincenzo Gentile, Marco Simonetti, Fabio Restagno

International Building Physics Conference 2018

This paper presents some experimental results of a new device for low energy/low exergy air conditioning system. The device can realize both dehumidification and sensible cooling of external air, and it is designed for very low pressure drops, drastically reducing the electricity consumption for the driving fans. It is composed by a finned coil heat exchanger, coated with a SAPO-34 zeolite layer, that handles both heat and mass transfer in a single component. During the adsorption a cold water flow at 20 °C circulates through the coil, cooling the air and realizing in a single step a complete air-treatment. Hot …

Go to article

Extracting Radiant Cooling From Building Exhaust Air Using The Maisotsenko Cycle Principle, Théo Keeley-Leclaire, Eric Teitelbaum, Suin Shim, Michael Bozlar, Howard A. Stone, Forrest Meggers Sep 2018

Extracting Radiant Cooling From Building Exhaust Air Using The Maisotsenko Cycle Principle, Théo Keeley-Leclaire, Eric Teitelbaum, Suin Shim, Michael Bozlar, Howard A. Stone, Forrest Meggers

International Building Physics Conference 2018

Indirect evaporative cooling has exciting implications for air based thermal comfort. With recent advances in the research and commercialization of Maisotsenko Cycle (M-Cycle), or dew-point, evaporative cooling, thermodynamics can be fully leveraged to provide effectively free air cooling. However, few studies seek to generate cool surfaces by evaporation for radiant cooling. As a method to reduce building energy consumption, such an evapo-radiative system would maintain occupant thermal comfort at higher ventilation air temperatures and provide cooling at low cost. This study explores an analytical model for an M-Cycle evapo-radiative cooling system that derives a 1-D temperature profile throughout an experimental …

Go to article

Periodic Alternation Between Intake And Exhaust Of Air In Dynamic Insulation, Masaru Abuku, Akira Fukushima, Tsukasa Tsukidate, Sayaka Murata, Akinori Hosoi, Hideo Ichiboji, Daisuke Kitagawa, Kanako Makita Sep 2018

Periodic Alternation Between Intake And Exhaust Of Air In Dynamic Insulation, Masaru Abuku, Akira Fukushima, Tsukasa Tsukidate, Sayaka Murata, Akinori Hosoi, Hideo Ichiboji, Daisuke Kitagawa, Kanako Makita

International Building Physics Conference 2018

Dynamic insulation (DI) can recover heat lost in conduction by drawing cold outdoor air into indoor through an insulation wall in winter. A “breathing DI” system we proposed in the past has functions both as an insulated envelope and as a highly efficient heat exchanger for ventilation. It is alternated periodically that the outdoor air is drawn through half of walls made of breathable inorganic concrete (BIC) and the indoor air is exhausted through the other half of the BIC walls. In order to put the breathing DI system into practice in housing construction, this paper presents some studies from …

Go to article

A Deep Reinforcement Learning Method For Model-Based Optimal Control Of Hvac Systems, Zhiang Zhang, Chenlu Zhang, Khee Poh Lam Sep 2018

A Deep Reinforcement Learning Method For Model-Based Optimal Control Of Hvac Systems, Zhiang Zhang, Chenlu Zhang, Khee Poh Lam

International Building Physics Conference 2018

Model-based optimal control (MOC) methods have strong potential to improve the energy efficiency of heating, ventilation and air conditioning (HVAC) system. However, most existing MOC methods require a low-order building model, which significantly limits the practicability of such methods. This study develops a novel model-based optimal control method for HVAC supervisory-level control based on the recently-proposed deep reinforcement learning (DRL) framework. The control method can directly use whole building energy model, a widely used flexible building modelling method, as the model and train an optimal control policy using DRL. By integrating deep learning models, the proposed control method can directly …

Go to article

The Energy Saving Performance Of Heat Recovery Ventilation System In Residential Buildings In The Summer Of Hot-Summer And Cold-Winter Zone In China, Siyuan Cheng, Yao Ma, Menghao Qin Sep 2018

The Energy Saving Performance Of Heat Recovery Ventilation System In Residential Buildings In The Summer Of Hot-Summer And Cold-Winter Zone In China, Siyuan Cheng, Yao Ma, Menghao Qin

International Building Physics Conference 2018

The rapid increase in space cooling and heating demand in recent years in the hot-summer and cold-winter (HSCW) zone in China (the most developed area in China) requires technology to be as efficient as possible, consuming the lowest amount of energy necessary. Heat recovery ventilation (HRV) system can meet this demand by lowering the building energy demand by pre-heating or pre-cooling. However, the climate in HSCW zone is humid and rainy all the year round, which may affect the energy performance of HRV system. The current research focuses on field measurements of the performance of HRV system in a test …

Go to article

A Review Of Microgrid Energy Systems, Lei Gao, Yunho Hwang, Reinhard Radermacher Sep 2018

A Review Of Microgrid Energy Systems, Lei Gao, Yunho Hwang, Reinhard Radermacher

International Building Physics Conference 2018

Microgrid combined cooling, heating and power energy systems are under intensive investigation owing to expansion of renewable energy generation and development of advanced technologies in distributed energy generation. Multi-generation systems serve as one of the core parts in any microgrid energy systems. This review paper presents the summary of state-of-the-art technologies in these multi-generation systems. The first part introduces the energy structure based on energy sources and the latest renewable energy harvesting technologies for solar, biomass and geothermal energy. In the second part, prime movers, including small-scale ones used in a microgrid energy system, are summarized. The third part shows …

Go to article

Novel Gas-Driven Fuel Cell Hvac And Dehumidification Prototype, Daniel Betts, Moonis R. Ally, Vishaldeep Sharma, Matthew Tilghman, Matthew Graham, Shyam Mudiraj Sep 2018

Novel Gas-Driven Fuel Cell Hvac And Dehumidification Prototype, Daniel Betts, Moonis R. Ally, Vishaldeep Sharma, Matthew Tilghman, Matthew Graham, Shyam Mudiraj

International Building Physics Conference 2018

Performance of a novel gas-driven, electricity-producing heating, ventilation, and air conditioning (HVAC) system with no vapor compression and no hydrofluorocarbon (HFC) refrigerant shall be discussed in the paper. The prototype was evaluated at ORNL under a Small Business Voucher (SBV) Cooperative Research and Development (CRADA) program. The target market is commercial buildings in the United States. The goal is to mitigate or eliminate grid-power for building air conditioning, coincident peak demand and associated spinning reserves, aiding in flattening of the “duck curve”. The technical goal is to transform the common packaged rooftop unit into a cost-effective distributed energy resource, opening …

Go to article

Impacts Of Climate Change And Its Uncertainties On The Renewable Energy Generation And Energy Demand In Urban Areas, Vahid M. Nik, Yuchen Yang, Bijan Adl-Zarrabi Sep 2018

Impacts Of Climate Change And Its Uncertainties On The Renewable Energy Generation And Energy Demand In Urban Areas, Vahid M. Nik, Yuchen Yang, Bijan Adl-Zarrabi

International Building Physics Conference 2018

This work investigates the effects of future climate uncertainties in calculating the heating and cooling demand of buildings and estimating potentials for renewable energy generation (solar PV and wind). The building stock of Lund in Sweden is considered for energy simulations and for future climate, the most recent outputs of RCA4, which is the 4th generation of the Rossby Centre regional climate model (RCM), is used considering several two representative concentration pathways (RCPs) and four global climate models (GCMs). Simulations and assessment are performed for three 30-year time periods, from 2010 until 2099. Through comparing distributions of data sets, it …

Go to article

Classification Of The Indoor Environment In A High-School Building By Means Of Subjective Responses, Lorenza Pistore, Ilaria Pittana, Francesca Cappelletti, Andrea Gasparella, Piercarlo Romagnoni Sep 2018

Classification Of The Indoor Environment In A High-School Building By Means Of Subjective Responses, Lorenza Pistore, Ilaria Pittana, Francesca Cappelletti, Andrea Gasparella, Piercarlo Romagnoni

International Building Physics Conference 2018

In this paper the subjective evaluation of the indoor environment of a secondary school in Treviso (Italy) is presented. Field campaigns have been carried out during the winter season in order to assess people overall satisfaction about the environment, their behavior towards discomfort and their interactions with the building and the systems. A specific questionnaire has been elaborated, paying particular attention to the occupants target and to the questions needed to grasp not only the comfort feedbacks, but also the dynamics and the individual students’ attitudes that can influence the building energy performance. A first general evaluation has been elaborated …

Go to article

Comparison Between Qualitative And Quantitative Measurement In Assessing Thermal Comfort In An Elementary School, Boyu Li, Ming Hu, Greg Goldstein Sep 2018

Comparison Between Qualitative And Quantitative Measurement In Assessing Thermal Comfort In An Elementary School, Boyu Li, Ming Hu, Greg Goldstein

International Building Physics Conference 2018

We compare qualitative and quantitative measurements to assess an elementary school building’s thermal comfort. Quantitative measurements of the physical environment are useful but not sufficient, since different people respond differently in the same indoor environment. A qualitative survey of the school employees shows the thermal comfort level has a 3.73 out of 7 score and 40% of subjects rated it unsatisfactory, even though the temperature and humidity level are measured within the comfort range recommended by ASHERA 90.1 – 2004. This gap occurs because human metabolism is not taken into account in current design guidelines, even though there is a …

Go to article

Indoor Air Quality And Thermal Comfort For Elderly Residents In Houston Tx—A Case Study, Amir Baniassadi, David J. Sailor, Cassandra R. Olenick Sep 2018

Indoor Air Quality And Thermal Comfort For Elderly Residents In Houston Tx—A Case Study, Amir Baniassadi, David J. Sailor, Cassandra R. Olenick

International Building Physics Conference 2018

The elderly population is more vulnerable to poor indoor environmental quality. They also spend a larger portion of their time indoors than the general public, further exacerbating the associated health risks. As part of a larger study which aims to understand the health risks for the elderly population resulting from extreme heat events in Houston, TX, this study gathered empirical data on thermal comfort and air quality in existing assisted living facilities and in individual homes of the elderly. We made continuous measurements of indoor dry-bulb temperature, relative humidity, carbon dioxide (CO2) levels and occupancy status in 25 buildings during …

Go to article

Method For Detecting Contaminant Transport Through Leakages In A Condemned School, Fredrik Domhagen, Paula Wahlgren, Carl-Eric Hagentoft Sep 2018

Method For Detecting Contaminant Transport Through Leakages In A Condemned School, Fredrik Domhagen, Paula Wahlgren, Carl-Eric Hagentoft

International Building Physics Conference 2018

Many schools in Sweden, have problems with the indoor air, affecting the wellbeing and health of both pupil and teachers. Contaminants in the air, such as mold spores, radon, odors, and VOC, cause problems and it can be difficult to find the contaminant source, in particular if it is within the building construction. The aim of this project is to investigate air leakage paths and pressure differences in a school building with IAQ problems and to analyze how these parameters are related to contaminant transport. An increased knowledge of how contaminants are transported will then form the base for an …

Go to article

Modelling Of A Naturally Ventilated Bipv System For Building Energy Simulations, Juliana Gonçalves, Glenn Reynders, Jonathan Lehmann, Dirk Saelens Sep 2018

Modelling Of A Naturally Ventilated Bipv System For Building Energy Simulations, Juliana Gonçalves, Glenn Reynders, Jonathan Lehmann, Dirk Saelens

International Building Physics Conference 2018

Two major causes of energy yield reduction in PV systems are partial shading and high operating temperatures. Both issues are particularly critical for BIPV systems. The correct assessment of the BIPV contribution to the built environment depends, therefore, on the accurate prediction of PV temperature and on the possibility of simulating shading effects. This paper describes the development of a multi-physics model for a naturally ventilated façade BIPV system within the openIDEAS environment for building and district energy simulations. The PV electrical model used here follows a physics-based approach that takes into account solar intensity and temperature spatial variations within …

Go to article

Numerical Analysis Of The Influencing Factors On The Performance Of A Pipe-Embedded Window Operated In Summer, Sihang Jiang, Chong Shen, Xianting Li Sep 2018

Numerical Analysis Of The Influencing Factors On The Performance Of A Pipe-Embedded Window Operated In Summer, Sihang Jiang, Chong Shen, Xianting Li

International Building Physics Conference 2018

The pipe-embedded window is a double window structure with pipes embedded inside the cavity to adjust the temperature. The preliminary studies showed that it can significantly reduce the cooling load of buildings with natural cooling sources such as the water from cooling towers in summer. However, the research on the influencing factors of the pipeembedded window is insufficient. In this paper, the numerical calculation models are established for a pipe-embedded window and a traditional window. The influence of climatic factors, such as the natural cooling source temperature and outdoor air temperature on the thermal performance of the pipe-embedded window are …

Go to article

Validation Of The En 15193:2017 Calculation Method To Estimate The Daylight Supply In A Building: Comparison With Dynamic Climate-Based Simulations, Valerio Roberto Maria Lo Verso, Argun Paragamyan, Anna Pellegrino Sep 2018

Validation Of The En 15193:2017 Calculation Method To Estimate The Daylight Supply In A Building: Comparison With Dynamic Climate-Based Simulations, Valerio Roberto Maria Lo Verso, Argun Paragamyan, Anna Pellegrino

International Building Physics Conference 2018

This paper compares a simplified method to calculate the daylight factor and the annual daylight contribution in a space to the output of dynamic daylighting simulations. The simplified calculation method is the one implemented in the European Standard EN 15193 for the calculation of the energy demand for lighting in buildings, while the tool for dynamic simulations is Daysim (managed through DIVA-for-Rhino). The analysis was carried out by applying the two approaches to a reference office room, which was assumed to be located in different sites and having different window areas, with different orientations, both in the absence and in …

Go to article

Aerogel-Enhanced Blankets: State-Of-The-Art, Market Readiness, And Future Challenges, Umberto Berardi, Syed (Mark) Zaidi, Bryan Kovisto Sep 2018

Aerogel-Enhanced Blankets: State-Of-The-Art, Market Readiness, And Future Challenges, Umberto Berardi, Syed (Mark) Zaidi, Bryan Kovisto

International Building Physics Conference 2018

Aerogel-enhanced products are often indicated as promising materials for increasing the thermal resistance of the building envelope. In particular, aerogel-enhanced blankets have already showed their effectiveness in several retrofitting projects. This paper aims to review the current state of the art regarding aerogel-enhanced blankets. In these materials, a fiber matrix bonds together the aerogel structure, compensating the low mechanical properties of the aerogels without reducing their exceptionally low thermal conductivity. This paper describes current aerogel-enhanced blankets existing worldwide and produced by different companies. Then, a new aerogel-enhanced blanket developed by the authors is presented. Thermal characterization tests confirm the superior …

Go to article

Hygrothermal Analysis Of A Vapour-Open Assembly With Vacuum Insulation Panels, Brock Conley, Cynthia Ann Cruickshank, Mark Carver Sep 2018

Hygrothermal Analysis Of A Vapour-Open Assembly With Vacuum Insulation Panels, Brock Conley, Cynthia Ann Cruickshank, Mark Carver

International Building Physics Conference 2018

The following paper studies the year-long moisture conditions associated with vacuum insulation as the exterior insulation. The exterior insulation of one assembly was renovated by using 50.8 mm (2 inch) of expanded polystyrene (EPS) and represents the baseline performance of current common practice. Another assembly was built with 20 mm (0.7 inch) vacuum insulation panels encased in the equivalent thickness of EPS to represent a high RSI-value retrofit. The thermal performance was evaluated using a guarded hot box facility at Carleton University and the in-situ Building Envelope Test Hut at CanmetENERGY-Ottawa. The temperature, humidity and moisture content in the sheathing …

Go to article

Measurements Of Temperature Dependency On Thermal Insulation Thickness In Ventilated Attics, Thor Hansen, Eva B. Moeller Sep 2018

Measurements Of Temperature Dependency On Thermal Insulation Thickness In Ventilated Attics, Thor Hansen, Eva B. Moeller

International Building Physics Conference 2018

The main objective of this paper is by measurements to investigate whether increased thermal insulation thickness reduces the temperature in ventilated attics. With lower heat flux through the ceiling in the winter, the theory is that the temperature in the attic decreases and consequently the relative humidity increases which may cause mold growth. While some simulations support this theory, others do not. To test the theory in practice, measurements were performed in 29 dwellings, mainly older single family houses with ventilated attics and insulation thicknesses varying between 150 and 600 mm (6“ and 23“). The temperature was measured for more …

Go to article

Prediction Of The Long-Term Performance Of Vacuum Insulation Panel Installed In Real Building Environments, Hideya Yamamoto, Daisuke Ogura Sep 2018

Prediction Of The Long-Term Performance Of Vacuum Insulation Panel Installed In Real Building Environments, Hideya Yamamoto, Daisuke Ogura

International Building Physics Conference 2018

Vacuum insulation panels (VIPs) are high-performance insulating materials constructed by covering a core and adsorbent with an envelope and evacuating the air from the inside. VIPs have used to enhance the energy efficiency of devices including refrigerators, vending machines, and cooler boxes. In order to apply VIPs as heat-insulation materials in buildings and houses, it is necessary to predict the long-term performance of the VIPs and verify the accuracy of the prediction using actual measurements. VIPs using glass fiber as a core material are spreading in Japan, and VIPs using glass fiber core material as the core is also likely …

Go to article

Super Insulation Material In District Heating Pipes, Bijan Adl-Zarrabi Sep 2018

Super Insulation Material In District Heating Pipes, Bijan Adl-Zarrabi

International Building Physics Conference 2018

In Swedish district heating systems, 10% of the produced energy is lost at the distribution network. It is of interest to lower the energy losses both for economic and environmental reasons. Since 2011 the feasibility of using superinsulation material for insulation of the district heating pipes were studied. Apparent thermal conductivity and long term performance of vacuum panels has been identified has the crucial challenge for using vacuum insulation panels. The estimated life time of a vacuum panel in building applications at 90 °C is about 50 years. The life time estimation is based on the climate condition valid for …

Go to article

Experimental Analysis Of Micro-Cracks On The Change Of Moisture Transport Properties Of Aac, Jiří Maděra, Jan Kočí, Václav Kočí, Miloš Jerman, Magdaléna Doleželová Sep 2018

Experimental Analysis Of Micro-Cracks On The Change Of Moisture Transport Properties Of Aac, Jiří Maděra, Jan Kočí, Václav Kočí, Miloš Jerman, Magdaléna Doleželová

International Building Physics Conference 2018

In this paper, series of experiment measurements is carried out in order to study effect of freeze/thaw loading on the change of moisture transport properties of autoclaved aerated concrete. The samples were subjected to 15, 30 and 45 freeze/thaw cycles and subsequently basic physical properties, pore size distribution and water vapor and liquid water transport properties were investigated. The results showed significant changes in material properties of the material. The results of this research can be further implemented into computational models in order to bring the simulation results closer to the reality.

Go to article

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 Sep 2018

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 …

Go to article

Psychrometer Method To Measure The Moisture Retention Curves Of Porous Building Materials In The Full Humidity Range, Chi Feng, Maria Fredriksson, Hans Janssen Sep 2018

Psychrometer Method To Measure The Moisture Retention Curves Of Porous Building Materials In The Full Humidity Range, Chi Feng, Maria Fredriksson, Hans Janssen

International Building Physics Conference 2018

Moisture retention curves describe the moisture storage property of porous building materials. Currently available experimental methods for measuring moisture retention curves are often demanding in equipment and moreover not always suited for the adsorption process in most of the capillary moisture content range. This paper proposes a novel and simple technique – the psychrometer method – and validates it by the tests on calcium silicate and ceramic brick. In this experiment the moisture content of the samples experiencing adsorption and desorption processes is determined gravimetrically, while the corresponding capillary pressures in the samples are measured with a chilled-mirror dew-point psychrometer. …

Go to article

Semi-Permeable Membrane Experiment For Unsaturated Liquid Permeability Of Building Materials: Potential And Practice, Chi Feng, Hans Janssen Sep 2018

Semi-Permeable Membrane Experiment For Unsaturated Liquid Permeability Of Building Materials: Potential And Practice, Chi Feng, Hans Janssen

International Building Physics Conference 2018

The unsaturated liquid permeability is a crucial hygric property of porous building materials. Its direct measurement is very challenging however, because currently available experimental protocols are either demanding in test facilities, complicated in data processing, or limited in moisture content range. Inspired by the osmosis phenomenon, we study the possibility to apply semi-permeable membranes for directly measuring the liquid permeability of porous building materials. The key principle is studied profoundly and a simple experimental set-up is constructed. Trial tests on calcium silicate insulation and autoclaved aerated concrete are performed. Results show that the experimental set-up can be used to measure …

Go to article

A Nonlinear Approximate Solution To The Damped Pendulum Derived Using The Method Of Successive Approximations, Justin A. Hill, Javier E. Hasbun 8394092 Sep 2018

A Nonlinear Approximate Solution To The Damped Pendulum Derived Using The Method Of Successive Approximations, Justin A. Hill, Javier E. Hasbun 8394092

Georgia Journal of Science

An approximate analytic solution to the damped pendulum is derived using the method of successive approximations to obtain a nonlinear approximation for the system. We take the approximate solution to the undamped pendulum using the method of successive approximations and compare it to the damped pendulum solution when a linear approximation is used. By looking at these two solutions, we can make an educated guess about the form of the general, approximate solution to the nonlinear damped pendulum. By adjusting the initial guesses and the initial conditions, we derive approximate solutions in three ways. Using MATLAB, the approximate solutions are …

Go to article

Evaluation Of The Impact Of Weather Variability On A Net Zero Energy Building: Advantage Of Sensitivity Analysis For Performance Guarantee, Jeanne Goffart, Monika Woloszyn Sep 2018

Evaluation Of The Impact Of Weather Variability On A Net Zero Energy Building: Advantage Of Sensitivity Analysis For Performance Guarantee, Jeanne Goffart, Monika Woloszyn

International Building Physics Conference 2018

Global sensitivity analysis associated with uncertainty analysis evaluates the robustness of a physical system and prioritises measurement and/or modelling efforts. The uncertainty analysis evaluates a confidence interval, whereas the sensitivity analysis quantifies the accountability of each uncertain input on the dispersion of the output. These statistical methods are usually used to account for the variability of the static inputs, which are constant regarding the evolution of the system, for example the physical properties of the materials modelled. Dynamic inputs however, i.e. parameters that are variable over time, are rarely taken into account in the statistical analyses because of the difficulty …

Go to article

Description Method Of Outdoor Climate Characteristics Considering The Comprehensive Effect On Indoor Climate, Xinying Fan, Meiling Sun, Tongke Zhao Sep 2018

Description Method Of Outdoor Climate Characteristics Considering The Comprehensive Effect On Indoor Climate, Xinying Fan, Meiling Sun, Tongke Zhao

International Building Physics Conference 2018

What human and buildings perceived the environmental information is comprehensive information. However, existing indoor environment design methods are often simplified to single parameters for indoor and outdoor environmental prediction and indoor environment design. In order to describe the indoor climate characteristics of the comprehensive impact of outdoor climate, this study uses the ensemble empirical mode decomposition (EEMD) method to establish a multi-parameter integrated outdoor comprehensive environmental information description method based on the information-response theory. The outdoor climate feature description method is applied to the analysis of the amplitude and frequency characteristics of outdoor comprehensive information, which provides a research basis …

Go to article

First Prev Next Last