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2018

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Articles 61 - 90 of 338

Full-Text Articles in Engineering Physics

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 Sep 2018

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 …

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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 Sep 2018

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 …

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Computational Evaluation Of The Thermal Performance Of Underground Bunkers: The Case Of Albania, Rudina Breçani, Sokol Dervishi Sep 2018

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 …

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New Technology Creates New Lightscape, Jianzhen Qiu, Shuoxian Wu Sep 2018

New Technology Creates New Lightscape, Jianzhen Qiu, Shuoxian Wu

International Building Physics Conference 2018

Light is a key element of our world’s beauty. Chinese scholar Wu Shuoxian put forward the concept of “Lightscape”, and proposed its research as a parallel discipline of the “Soundscape”. As a special aspect of the visual-scape, lightscape can give us a comprehensive and multi-disciplinary perspective of living environment. Many traditional lightscape cases have always been remembered as the representations of specific regional cultures. This article presents several cases of modern lightscape created with new technologies and methods. Included in these cases are: outstanding lightscape and art installments created by artists using light as a key element and fulfilled with …

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Roof Windows For Passive Houses – What Can Be Improved?, Jan Tywoniak, Kamil Staněk, Vítězslav Calta Sep 2018

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 …

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Optical Performance Of Polycarbonate Multi-Wall Panels In The Form Of Transparent Insulation Based On Long-Term Outdoor Measurements, Miroslav Čekon Sep 2018

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 …

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Sensitivity Analysis Using The Swmm Lid Control For An Extensive Green Roof In Syracuse, Ny, Lucie L. Worthen, Cliff I. Davidson Sep 2018

Sensitivity Analysis Using The Swmm Lid Control For An Extensive Green Roof In Syracuse, Ny, Lucie L. Worthen, Cliff I. Davidson

International Building Physics Conference 2018

Green roofs are a popular form of sustainable drainage infrastructure. They provide many environmental benefits, such as reducing peak urban stormwater runoff by enabling retention and evapotranspiration similar to natural conditions. Each green roof has unique hydrologic behavior based on physical properties of its growth medium, types of vegetation, structural design, and climate. To improve the application of green roof technology at a site, there is a need to predict stormwater mitigation for several designs before commencing green roof construction. The Storm Water Management Model (SWMM) includes a low impact development control module which makes it possible to model the …

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Simulation Of Building Physics For Beginning Design Students, Alexander Timmer Sep 2018

Simulation Of Building Physics For Beginning Design Students, Alexander Timmer

International Building Physics Conference 2018

Concepts such as heat transfer, stack effect, natural ventilation, and other problems related to building physics are taught to beginning design students through architectural examples, deterministic diagrams, and rules of thumb. Unlike the approach to teaching form, which involves exploration and iteration within a studio environment, often suspending disbelief to allow exploration, these exercises see architecture through the lenses of optimization, equilibrium, and objective outcomes. They are taught as steady state concepts. Instead of leaning on teaching techniques derived from an engineering standpoint, often technocratic and deterministic, it would serve beginning design students well to explore these concepts through experimentation …

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Study On Multivariate Regression Model Of Indoor And Outdoor Particulate Pollution In Severe Cold Area Of China, Yang Lv, Haifeng Wang, Yuwei Zhou, Tongke Zhao, Bin Chen, Lei Zhang, Qi Zhao Sep 2018

Study On Multivariate Regression Model Of Indoor And Outdoor Particulate Pollution In Severe Cold Area Of China, Yang Lv, Haifeng Wang, Yuwei Zhou, Tongke Zhao, Bin Chen, Lei Zhang, Qi Zhao

International Building Physics Conference 2018

At present, the widespread existence of haze phenomenon has a serious impact on indoor air quality. Indoor particulate pollution has been paid more and more attention by the society. However, the correlation and diffusion mechanism of indoor and outdoor particulate matter are still controversial. In order to explore the correlation between indoor and outdoor particulate matter of different building types in heating season and non-heating season, the indoor and outdoor particulate concentrations and meteorological parameters of 110 stations in severe cold area of China were monitored by experiments. The analysis shows that indoor and outdoor temperature, humidity, air velocity, wind …

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Ventilation Potential Assessments For Residential Building Arrangements Based On Exceedance Probability Analysis, Wei You, Lian Tang, Wowo Ding Sep 2018

Ventilation Potential Assessments For Residential Building Arrangements Based On Exceedance Probability Analysis, Wei You, Lian Tang, Wowo Ding

International Building Physics Conference 2018

In this study, the building ventilation potentials were assessed at building group level. Exceedance probability analysis was applied to estimate the uncertainties associated with the influence of climate on wind environment. The criterion was proposed based on building facade pressures. Tw o typical residential building arrangements were investigated. Simulation results show that facade pressure based exceedance probability are efficient in assessing the natural ventilation potentials of building groups and building height variations are important for improving building natural ventilation potentials.

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Uncertainty In Building Energy Performance Characterization: Impact Of Gas Consumption Decomposition On Estimated Heat Loss Coefficient, Marieline Senave, Glenn Reynders, Behzad Sodagar, Dirk Saelens Sep 2018

Uncertainty In Building Energy Performance Characterization: Impact Of Gas Consumption Decomposition On Estimated Heat Loss Coefficient, Marieline Senave, Glenn Reynders, Behzad Sodagar, Dirk Saelens

International Building Physics Conference 2018

Characterization of building energy performance indicators such as the Heat Loss Coefficient (HLC) based on in-situ measurement data calls for thorough building physical insight, a well -designed measurement set-up to collect sufficient, qualitative data and adequate data analysis methods. On-board monitoring may be an alternative for dedicated experiments to perform the data collection task. This paper analyses the sensitivity of the end-result of the characterization, the H LC estimate, to flaws in the monitoring data set. More specifically, the impact of not installing submeters to disentangle the gas consumption for space heating and the production of domestic hot water is …

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A Framework For Comfort Assessment In Buildings And Districts Retrofit Process, Marco Arnesano, Federica Naspi, Livia Claudi, Gian Marco Revel Sep 2018

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 …

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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 Sep 2018

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 …

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Building Information Modeling (Bim) Implementation For Sustainability Analysis: A Mega Airport Project Case Study, Basak Keskin, Baris Salman Sep 2018

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 …

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Criteria For Identifying Failure Optimization Algorithms In Building Energy Optimization And Case Studies, Binghui Si, Xing Shi Sep 2018

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, …

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Elaboration Of The Decision Space For An Optimization Of Building Retrofit, Yannis Merlet, Simon Rouchier, Arnaud Jay, Monika Woloszyn Sep 2018

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 …

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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 Sep 2018

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 …

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Intrinsic Evaporative Cooling With Natural Ventilation And Shading For Adaptive Thermal Comfort In Tropical Buildings, Mae-Ling Lokko, Alexandra Rempel Sep 2018

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 …

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Long Term Measurements And Ham Modelling Of An Interior Insulation Solution For An Office Building In Cold Climate, Paul Klõšeiko, Targo Kalamees Sep 2018

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 …

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Preliminary Monitoring Results Of Ventilated Heavyweight Building Envelope From Recycled Aggregate, Marina Bagarić, Ivana Banjad Pečur, Bojan Milovanović Sep 2018

Preliminary Monitoring Results Of Ventilated Heavyweight Building Envelope From Recycled Aggregate, Marina Bagarić, Ivana Banjad Pečur, Bojan Milovanović

International Building Physics Conference 2018

Potential of recycled aggregate concrete (RAC) has already been acknowledged by many researchers, but the focus was primarily on its mechanical and durability properties at material level. If the focus is shifted to element and whole building level, then the question can be raised; how building envelopes made from RAC behave when exposed to real environment? The present paper describes an experimental set up to monitor hygrothermal behaviour of one three-storey family house built with prefabricated ventilated sandwich wall panels made from recycled concrete and recycled brick aggregate. This type of building envelope can be classified as a heavyweight envelope. …

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Review Of The Sky Temperature And Solar Decomposition, And Their Impact On Thermal Modeling, Farhad Hemmati, Fitsum Tariku Sep 2018

Review Of The Sky Temperature And Solar Decomposition, And Their Impact On Thermal Modeling, Farhad Hemmati, Fitsum Tariku

International Building Physics Conference 2018

Performing accurate hourly building energy modeling requires presence of reliable boundary conditions. The required data for energy simulation model entries are exterior air temperature, exterior air relative humidity, solar radiation, sky temperature, wind velocity and cloud cover. Unfortunately, most available measured solar energy data is in the form of global horizontal radiation. Moreover, measured night sky temperature is normally not available. Proper energy modeling of a full building requires to have accurate solar radiation intensity on angled building envelope assemblies as well as precise sky temperature data available. In this study, among several available models, three hourly horizontal global solar …

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The Design, Construction And Commissioning Of A Small Scale Dynamic Calibrated Hot Box (Chb), Timothy P. O’Leary, Aidan Duffy Sep 2018

The Design, Construction And Commissioning Of A Small Scale Dynamic Calibrated Hot Box (Chb), Timothy P. O’Leary, Aidan Duffy

International Building Physics Conference 2018

Sustainable construction and in particular the sustainability of materials is a global issue with legislation on material properties and product performance at the forefront. In traditional constructed buildings however, it can be extremely challenging to get accurate data on performance. The variability of building materials design, manufacture and construction from different eras is substantial, even within local areas due to the vernacular nature of construction from these periods. Material properties testing can be expensive and is not always readily available when required and is therefore often ignored, particularly in the retrofitting of historic buildings. This can have major adverse effects …

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The Effect Of Human Walking On Distribution Characteristics Of Indoor Particulate Matter, Yang Lv, Haifeng Wang, Hiroshi Yoshino, Hiroshi Yonekura, Rie Takaki, Genta Kurihara Sep 2018

The Effect Of Human Walking On Distribution Characteristics Of Indoor Particulate Matter, Yang Lv, Haifeng Wang, Hiroshi Yoshino, Hiroshi Yonekura, Rie Takaki, Genta Kurihara

International Building Physics Conference 2018

In modern society, house dust particulate matters pollution had become serious. Ventilation is an important method for removing house dust particulate matters and it is very important to explore the removal efficiency of house dust particulate matters under different ventilation modes. This study analyses the removal effect of house dust particulate matters under the two typical ventilation modes called ceiling exhaust and slit exhaust strategy through experiments and date analysis. In the process of experiments, riboflavin particles were used as the house dust particulate matters, instantaneous microbial detection (IMD) was used to measure the house dust particulate matters. Walking test …

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Energy Flow Through The Onondaga County Convention Center Green Roof In Syracuse, Ny, Alyssa Pizzi, Cliff I. Davidson Sep 2018

Energy Flow Through The Onondaga County Convention Center Green Roof In Syracuse, Ny, Alyssa Pizzi, Cliff I. Davidson

International Building Physics Conference 2018

Buildings in the Northeast U.S. with large interior open spaces and high ceilings require substantial amounts of energy to heat and cool the spaces. The objectives of this experiment are to model the heat flux across different layers of a green roof and to estimate the thermal resistance of the layers. The project will examine conditions in winter and summer, considering air temperature and snow cover on the roof. The scope of this study includes measurements of the transfer of energy through the green roof on the Onondaga County Convention Center in Syracuse, NY. The methods include collection of data …

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Thermal Performance Analysis Of Traditional Housing In Albania, Rudina Belba, Sokol Dervishi Sep 2018

Thermal Performance Analysis Of Traditional Housing In Albania, Rudina Belba, Sokol Dervishi

International Building Physics Conference 2018

This paper introduces the results of a one-year research, to gather and analyse data on the traditional housing buildings in Kukes region, Albania. The energy performance and the thermal comfort conditions in five different buildings were examined. The Design Builder Energy simulation software was used to analyse the thermal performance of the selected typologies. Detailed construction activity and weather information was applied in modelling the houses. Simulation results showed that these buildings require only heating during the winter. As for the first villa, seven improvement scenarios were applied and examined. The same scenarios incorporate the use of thermal insulation of …

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Effect Of Urban Texture On Building Energy Performance, Suzi Dilara Mangan, Irem Sozen, Gul Koclar Oral, Idil Erdemir Kocagil Sep 2018

Effect Of Urban Texture On Building Energy Performance, Suzi Dilara Mangan, Irem Sozen, Gul Koclar Oral, Idil Erdemir Kocagil

International Building Physics Conference 2018

Today, ongoing discussions on climate change, depletion of fossil fuels and energy efficiency emphasize the need for a more sustainable built environment and thus the need to reduce energy consumption in buildings and urban textures and reduce greenhouse gas emissions. Therefore the evaluation of building energy performance with a holistic approach, taking the effect of urban textures and microclimates into consideration has become very significant in the recent years. Urban texture is a commonly accepted expression including the form and height of buildings, the width of streets, their orientation, spatial configuration and arrangement in space intersection, vegetation and so on. …

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Using Advanced Urban Canopy Models To Investigate The Potential Of Thermochromic Materials As Urban Heat Island Mitigation Strategies, Claudia Fabiani, Anna Laura Pisello, Elie Bou-Zeid, Jiachuan Yang Sep 2018

Using Advanced Urban Canopy Models To Investigate The Potential Of Thermochromic Materials As Urban Heat Island Mitigation Strategies, Claudia Fabiani, Anna Laura Pisello, Elie Bou-Zeid, Jiachuan Yang

International Building Physics Conference 2018

Recent trends in urbanization processes are causing serious threats at both local and global environmental scale. Greenhouse gas emissions, heat waves, and the heat island effect are constantly growing in intensity and produce increasing discomfort and health impacts in urban populations. In this context, the building sector is currently developing advanced and adaptive materials for building envelope and paving surface applications characterized by high energy performance and low embodied energy. Most of these innovative materials are firstly analysed at the component scale by means of laboratory investigations, while their effect on the built environment is generally assessed at a later …

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Rapid Cooling Of Urban Surfaces During Rainfall: Physical Basis, Dominant Energy Fluxes, And Sensitivity To Pavement And Rainfall Properties, Hamidreza Omidvar, Elie Bou-Zeid Sep 2018

Rapid Cooling Of Urban Surfaces During Rainfall: Physical Basis, Dominant Energy Fluxes, And Sensitivity To Pavement And Rainfall Properties, Hamidreza Omidvar, Elie Bou-Zeid

International Building Physics Conference 2018

Using model for the heat transfer between pavements and runoff during rainfall, we investigate the importance of different pavement and rainfall properties, as well as crucial energy budget terms that drive the cooling processes. The results indicate that the pavement and runoff temperature and energy fluxes are very sensitive to the rain temperature. In addition, pavement albedo has a significant effect on the simulated temperature since it modifies the initial pavement temperature before the rain starts. The results also indicated that among the different energy budget terms, evaporation and long wave radiation are the main cooling terms, while the shortwave …

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Analytical And Numerical Investigation On Depth And Pipe Configuration For Coaxial Borehole Heat Exchanger, A Preliminary Study, Hongshan Guo, Forrest Meggers Sep 2018

Analytical And Numerical Investigation On Depth And Pipe Configuration For Coaxial Borehole Heat Exchanger, A Preliminary Study, Hongshan Guo, Forrest Meggers

International Building Physics Conference 2018

Existing research on the performance of shallow geothermal systems are prone to investigate the ground as a large thermal mass at a constant temperature despite possible temperature increase at depths - otherwise commonly known as the geothermal gradient. Most of the existing analytical models that predict the heat exchange between a borehole heat exchanger with the soil does not allow for the geothermal gradients to be accounted for. The few models that actually does account for the geothermal gradients, on the other hand, does so by enforcing a pre-existing temperature gradient only. We are presenting a bottom up approach in …

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Comparison Of Lattice Boltzmann Method And Finite Volume Method With Large Eddy Simulation In Isothermal Room Flow, Mengtao Han, Ryozo Ooka, Hideki Kikumoto Sep 2018

Comparison Of Lattice Boltzmann Method And Finite Volume Method With Large Eddy Simulation In Isothermal Room Flow, Mengtao Han, Ryozo Ooka, Hideki Kikumoto

International Building Physics Conference 2018

Lattice Boltzmann method (LBM), as a new computational fluid simulation method, has aroused widespread attention in recent decades within engineering practice. LBM with large eddy simulation (LBM-LES) model is commonly used in predicting high Reynolds flow, and is considered to have a prediction accuracy similar to traditional finite volume method (FVMLES). Nonetheless, a systematic discussion on the accuracy of LBM-LES, and its consistency with FVM-LES, in indoor turbulent flow situations, is still insufficient. In this study, simulations of an indoor isothermal forced convection benchmark case (from IEA Annex 20) are implemented by using both LBM-LES and FVM-LES, with the aim …

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