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Full-Text Articles in Physics

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

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

International Building Physics Conference

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


Experimental Study On The Stomatal Resistance Of Green Roof Vegetation Of Semiarid Climates For Building Energy Simulations, Ursula Steinfort, Rocío Arriola-Cepeda, Sergio Vera, Francisco Albornoz Sep 2018

Experimental Study On The Stomatal Resistance Of Green Roof Vegetation Of Semiarid Climates For Building Energy Simulations, Ursula Steinfort, Rocío Arriola-Cepeda, Sergio Vera, Francisco Albornoz

International Building Physics Conference

Current modelling approaches for energy simulations in green roofs use a range of values for parameters such as stomatal resistance (rs) of the vegetation. rs reflects the capability of a plant to transpire, thus it has a direct relation to the cooling potential of green roofs in buildings. Therefore, rs values need to be revised based on differences among species and contrasting environmental conditions, considering anatomical and physiological characteristics among species and their changes throughout the day. In order to provide real data on species commonly used for green roofs in semiarid climates, this paper aims to evaluate the stomatal ...


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

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

International Building Physics Conference

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


The Impact Of Ventilation Strategy On Overheating Resilience And Energy Performance Of Schools Against Climate Change: The Evidence From Two Uk Secondary Schools, Esfand Burman, Dejan Mumovic Sep 2018

The Impact Of Ventilation Strategy On Overheating Resilience And Energy Performance Of Schools Against Climate Change: The Evidence From Two Uk Secondary Schools, Esfand Burman, Dejan Mumovic

International Building Physics Conference

The indoor environmental quality and energy performance of two modern secondary schools in the UK which have fundamentally different environmental strategies were investigated during building performance evaluations. The performances of these buildings against the projected weather data for future were also analysed. The results point to significant risk of future overheating as a result of climate change in the naturally ventilated building with passive measures that go well beyond the existing guidelines for schools. The other school with mechanical ventilation shows resilience to future overheating. However, shortcomings in building procurement and operation have severely compromised its energy performance. It is ...


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


Greening Rooftops To Reduce Heat Islands: How Large Is Large Enough?, Jiachuan Yang, Elie Bou-Zeid Sep 2018

Greening Rooftops To Reduce Heat Islands: How Large Is Large Enough?, Jiachuan Yang, Elie Bou-Zeid

International Building Physics Conference

Green roofs, with adequate water supply, have been proven as effective measures to reduce urban environmental temperature. The benefits of large-scale deployment of green roofs have been studied mainly through numerical simulations with unrealistic high penetration scenarios, where all rooftops across the entire metropolis is assumed to be retrofitted. In this study, the scale dependence of the cooling effect of green roofs is investigated with a coverage of 25% over buildings at local, city, or regional scales. We compared results at 6 major U.S. cities to assess the response of the scale dependence to geoclimatic conditions. High-resolution weather simulations ...


The Use Of A Large, Extensive Green Roof For Multiple Research Objectives, Cliff I. Davidson, Carli D. Flynn, Charitha Gunawardana, Alexander J. Johnson, Mallory N. Squier, Lucie L. Worthen, Yige Yang Sep 2018

The Use Of A Large, Extensive Green Roof For Multiple Research Objectives, Cliff I. Davidson, Carli D. Flynn, Charitha Gunawardana, Alexander J. Johnson, Mallory N. Squier, Lucie L. Worthen, Yige Yang

International Building Physics Conference

The Green Roof on the Onondaga County Convention Center in Syracuse, NY is planted with several varieties of sedum over an area of 0.56 hectares. The roof was constructed in 2011, and has been instrumented with sensors to enable research and education over an extended period. The purpose of the current work on this roof is to quantify its performance with respect to water storage and energy transfer, and to identify chemical constituents in the runoff that might be contributed by the growth medium. The scope of the project also includes a number of measurements on traditional roofs in ...


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


A Novel Approach To Near-Real Time Monitoring Of Ventilation Rate And Indoor Air Quality In Residential Houses, Achalu Tirfe, Jianshun Zhang Sep 2018

A Novel Approach To Near-Real Time Monitoring Of Ventilation Rate And Indoor Air Quality In Residential Houses, Achalu Tirfe, Jianshun Zhang

International Building Physics Conference

Physics-based infiltration models, like Lawrence Berkeley Laboratory (LBL) and Alberta Infiltration Model (AIM-2), have been used to predict infiltration rate in near-real time. These models are derived from the driving forces of wind and temperature difference across the building enclosure system, both of which cause pressure differences across the enclosure system for infiltration. The model incorporates other major factors like building leakage characteristics, distributions of openings, microenvironment conditions around the building enclosure as affected by building shields, topography and building shape. The accuracy of the models dependents on getting these factors right. However, these factors are specific for individual buildings ...


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

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


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

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

International Building Physics Conference

The moisture performance of building envelope assemblies has always been a major concern of designers. Building envelope is constantly exposed to moisture loads such as exterior and interior humidity, rain, groundwater, snow and construction moisture. Therefore, it is critical to control the moisture migration mechanism within building envelope walls. Moisture accumulation occurs when the wetting potential of building envelope exceeds its drying potential due to applying inappropriate construction materials or configuration designs. Moisture accumulation in mid-rise and high-rise concrete buildings has negative impacts on microbial growth, occupants’ comfort, energy consumption, freeze thaw and compressive and tensile strength of concrete which ...


Green Infrastructure And Urban Sustainability: Recent Advances And Future Challenges, Patricia J. Culligan, Robert A.W. Carleton, Christine S. Carleton Sep 2018

Green Infrastructure And Urban Sustainability: Recent Advances And Future Challenges, Patricia J. Culligan, Robert A.W. Carleton, Christine S. Carleton

International Building Physics Conference

Although the majority of urban green infrastructure (GI) programs in the United States, and elsewhere, are being driven by stormwater management challenges arising as a result of the impervious nature of modern cities, GI is also believed to provide other benefits that enhance urban sustainability. This paper discusses the role that GI systems might play in urban climate adaptation strategies for cities like New York City, where increases in both temperature and precipitation are projected over the coming decades. Examples of work conducted by the author and colleagues in New York City to quantify the performance of urban GI are ...


The Physics In Natural Ventilation Of Cities And Buildings, Yuguo Li Sep 2018

The Physics In Natural Ventilation Of Cities And Buildings, Yuguo Li

International Building Physics Conference

Asian cities are mostly taller, denser, deeper and larger than those in the West, and the magnitudes of building drag or urban heat island circulation and their effects on city ventilation are also stronger. The physics of urban climate in these large cities is complex, as a combined result of local circulation and synoptic winds modified by the mountainous topography and land/sea breeze, if any. Natural ventilation of a city refers to the penetration and distribution of rural air into an urban canopy layer. The weakened city ventilation has become one major reason for worsening urban warming and air ...


A Novel Methodology To Spatially Evaluate Dgp Classes By Means Of Vertical Illuminances. Preliminary Results, Luigi Giovannini, Fabio Favoino, Valerio R.M. Lo Verso, Anna Pellegrino, Valentina Serra Sep 2018

A Novel Methodology To Spatially Evaluate Dgp Classes By Means Of Vertical Illuminances. Preliminary Results, Luigi Giovannini, Fabio Favoino, Valerio R.M. Lo Verso, Anna Pellegrino, Valentina Serra

International Building Physics Conference

A novel methodology to overcome the main limit of the Daylight Glare Probability DGP (i.e. the heavy computational time for an annual analysis of the DGP profile in one point) is presented. This uses a proxy based on the vertical illuminance (Ev) at the eye level. To do so, the most suitable value of Ev, to substitute DGP, is found by means of a comparison to the corresponding DGP value through a fault-detection diagnosis technique. The methodology was applied to a representative enclosed office with one South-facing window (Window-to-Wall Ratio of 50%) located in Turin. The glazing was assumed ...


Comparative Study Of Different Design Configurations Based On The Daylight And Visual Comfort Performance Of Electrochromic Glass In A Side-Lit Office Building, Amir Hosseinzadeh Zarrabi, Mona Azarbayjani, Armin Amirazar, Roshanak Asharafi Sep 2018

Comparative Study Of Different Design Configurations Based On The Daylight And Visual Comfort Performance Of Electrochromic Glass In A Side-Lit Office Building, Amir Hosseinzadeh Zarrabi, Mona Azarbayjani, Armin Amirazar, Roshanak Asharafi

International Building Physics Conference

The objective of this research is to demonstrate the application of an optimization framework to assess and improve the impacts of workstation properties in relation to the performance of electrochromic glass regarding daylight and visual comfort. This framework is executed through a simulation-based parametric modeling workflow of an open-plan office to optimize partition layout, height, direction to windows, and materiality in response to annual glare probability (DGP) and climate-based daylighting metrics. In this paper, different office layouts equipped with Electrochromic glass, located in a mixed-humid climate has been simulated with DIVA plug-in for Rhinoceros/grasshopper software to maximize the daylight ...


Lighting Quality Study Of Shopping Malls In China Based On The Evaluation Experiment, Rui Dang, Yanhui Bu, Qingchen Wang, Gang Liu1 Sep 2018

Lighting Quality Study Of Shopping Malls In China Based On The Evaluation Experiment, Rui Dang, Yanhui Bu, Qingchen Wang, Gang Liu1

International Building Physics Conference

The lighting environment of the shopping malls will greatly influence the customer's visual comfort and product sales. This experiment studied the lighting environment of jewelry stores with the highest lighting energy consumption in shopping malls. The jewelry store scene which was built in the Key Laboratory of Building Environment Simulation had a total of 150 lighting conditions. Then, we measured lighting parameters, and subjective evaluation of lighting quality (including lighting comfort and commodities display effect) with 30 participants were carried out. We analyzed the experimental data to get the influence law of lighting parameters on lighting quality. Finally, this ...


Thermal Performance Of An Electric-Driven Smart Window: Experiments In A Full-Scale Test Room And Simulation Model, Giovanni Ciampi, Antonio Rosato, Sergio Sibilio, Giuseppe Peter Vanoli, Manuela Almeida, Luigi Maffei Sep 2018

Thermal Performance Of An Electric-Driven Smart Window: Experiments In A Full-Scale Test Room And Simulation Model, Giovanni Ciampi, Antonio Rosato, Sergio Sibilio, Giuseppe Peter Vanoli, Manuela Almeida, Luigi Maffei

International Building Physics Conference

This paper reports the results of experimental tests and numerical simulations aimed at evaluating the performance of an electric-driven smart window with respect to solar control in buildings. The experimental performances of the electric-driven smart window were evaluated using a south oriented full scale experimental facility designed and realized. The tests were carried out during the summer under real sky conditions upon varying the state of the electricdriven smart window (clear and milky). In the first part of the paper, the experimental results are discussed in terms of surface temperature of glazings as well as indoor air temperature in order ...


Experimental Validation Of A Model For Naturally Ventilated Double-Skin Facades, Alessandro Dama, Matteo Dopudi, Olena Kalyanova Larsen Sep 2018

Experimental Validation Of A Model For Naturally Ventilated Double-Skin Facades, Alessandro Dama, Matteo Dopudi, Olena Kalyanova Larsen

International Building Physics Conference

The steady state thermal model discussed in this paper is devoted to predict the temperatures and heat fluxes through a naturally ventilated DSF, having solar radiation and environmental temperatures as inputs. It is coupled with a fluid-dynamic model, based on a pressure loop, which takes into account both buoyancy and wind pressure at the openings. The model has been validated against experimental data, basing on the prediction of the internal surface temperature of the DSF. Results show acceptable accuracy in the prediction of the heat flux towards the inside, even though they reveal a slight heat flux overestimation associated with ...