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Articles 31 - 60 of 707

Full-Text Articles in Physics

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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


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.


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.


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 ...


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 ...


Experimental Investigations Of Wooden Beam Ends In Masonry With Internal Insulation: Results Contrasting Three Years Of The Experiment, Pavel Kopecký, Kamil Staněk, Michal Bureš, Jan Richter, Jan Tywoniak Sep 2018

Experimental Investigations Of Wooden Beam Ends In Masonry With Internal Insulation: Results Contrasting Three Years Of The Experiment, Pavel Kopecký, Kamil Staněk, Michal Bureš, Jan Richter, Jan Tywoniak

International Building Physics Conference

This paper deals with hygro-thermal performance of wooden beam ends embedded in masonry walls with lime-cement plaster applied on the external side. Three different insulation systems are attached on the internal side of masonry. The real scale experiment has been monitored for three consecutive years. Microclimatic conditions in joist pockets were assessed by VTT mold growth index. The paper shows the influence of two changes of boundary conditions on the microclimate in joist pockets. First, moisture load on the internal side of building enclosure was increased (24 °C, 60 % in winter 2016/2017 instead 20 °C, 50 % in winter 2015 ...


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 ...


Application Of Radiant Floor Heating In Large Space Buildings With Significant Cold Air Infiltration Through Door Openings, Gang Liu, Siyu Cheng, Yi Xu, Kuixing Liu Sep 2018

Application Of Radiant Floor Heating In Large Space Buildings With Significant Cold Air Infiltration Through Door Openings, Gang Liu, Siyu Cheng, Yi Xu, Kuixing Liu

International Building Physics Conference

Radiant Floor Heating System (RFHS) has been commonly used in railway stations in cold regions of China for its advantages in thermal comfort and energy efficiency. However, the uneven distribution and extremely cold area of the heating floor, caused by cold air infiltration through door openings, are commonly found in our filed measurements. This impact is not considered in the standardized design methods, resulting in an underestimation of the design heat flux. In this paper, CFD simulations are used to quantify the impacts of natural infiltration on surface heat transfer process. Model validation was made against field measurements. 13 simulations ...


Experimental Analysis On A Solar Air Heating Façade System, Valeria Longo, Francesco Isaia, Stefano Fantucci, Lorenza Bianco, Valentina Serra, Ruut Hannele Peuhkuri Sep 2018

Experimental Analysis On A Solar Air Heating Façade System, Valeria Longo, Francesco Isaia, Stefano Fantucci, Lorenza Bianco, Valentina Serra, Ruut Hannele Peuhkuri

International Building Physics Conference

In this study, investigations on the thermal performance of a solar air heating façade system were carried out. The system consists of a double skin building envelope composed by an opaque internal face, with a novel solar absorbent layer and a glazed external face. This kind of system, particularly suitable to refurbish existing building envelopes, is designed to work as a fan-assisted air supply, which mitigates the heating and ventilation demand during the winter period. An experimental campaign was set up using a full scale façade module in order to thoroughly characterize its thermal behavior and the air flow rate ...


On The Hygrothermal Behaviour Of Brick Veneer Cladded Timber Frame Walls: The Role Of The Vapour Diffusion Resistance Of The Wind Barrier, Michiel Vanpachtenbeke, Jelle Langmans, Jan Van Den Bulcke, Joris Van Acker, Staf Roels Sep 2018

On The Hygrothermal Behaviour Of Brick Veneer Cladded Timber Frame Walls: The Role Of The Vapour Diffusion Resistance Of The Wind Barrier, Michiel Vanpachtenbeke, Jelle Langmans, Jan Van Den Bulcke, Joris Van Acker, Staf Roels

International Building Physics Conference

The present study looks into the hygrothermal behaviour of timber frame walls with brick veneer cladding in a moderate sea climate. It specifically focuses on the contradictory criterion for the wind barrier when it comes to the risk of interstitial condensation for summer and winter conditions: a vapour open wind barrier is advantageous during an outward vapour flow (i.e. in typical winter conditions for European climates), while during an inward vapour flow (i.e. in summer conditions) a more vapour tight wind barrier is appropriate. Therefore, a field study is conducted on two typical timber frame walls with brick ...


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 ...


Bioclimatic Tools For Sustainable Design – Uncertainty Perspective, Krystyna Pietrzyk Sep 2018

Bioclimatic Tools For Sustainable Design – Uncertainty Perspective, Krystyna Pietrzyk

International Building Physics Conference

Overall, holistic approach in which the building is integrated into its environment with respect to building physics principles allows for discussion of a variety of passive strategies regarding the building placement (local climatic conditions, microclim


Optimal Control Strategies For Passive Heating And Cooling Elements Reduce Loads By Two-Thirds In The Adaptive Reuse Of A San Francisco Bay Area Office, Alexandra Rempel, Serena Lim Department Of Architecture, University Of Oregon, Eugene Or 97403 Sep 2018

Optimal Control Strategies For Passive Heating And Cooling Elements Reduce Loads By Two-Thirds In The Adaptive Reuse Of A San Francisco Bay Area Office, Alexandra Rempel, Serena Lim Department Of Architecture, University Of Oregon, Eugene Or 97403

International Building Physics Conference

Housing crises in urban centers and growing climate concerns are encouraging city planners and building owners to explore the conversion of commercial buildings into energy-efficient dwellings. Passive solar heating, shading, and natural ventilation are a


Sensing And Information Technologies For The Environment (Site); Hardware And Software Innovations In Mobile Sensing Technologies, Munitxa Maider, Elie Bou-Zeid Princeton University, Biayna Bogosian, Abdulghafar Al Tair, David Radcliff, Scott Fisher, Youngryel Ryu Sep 2018

Sensing And Information Technologies For The Environment (Site); Hardware And Software Innovations In Mobile Sensing Technologies, Munitxa Maider, Elie Bou-Zeid Princeton University, Biayna Bogosian, Abdulghafar Al Tair, David Radcliff, Scott Fisher, Youngryel Ryu

International Building Physics Conference

This research focuses on the development and integration of low-cost Mobile Urban Sensing Technologies (MUST) and immersive environmental data exploration mechanisms with the ambition to inform citizens about their environments and aid scientists in uncov


Hygrothermal Performance Of Sealed Attics In Climate Zone 3a, Mikael Salonvaara, Achilles Karagiozis, William Miller Sep 2018

Hygrothermal Performance Of Sealed Attics In Climate Zone 3a, Mikael Salonvaara, Achilles Karagiozis, William Miller

International Building Physics Conference

Sealed attics with fiberglass have been in the US building codes for several codes cycles. Prior to the IRC 2018, air permeable insulation (such as fiberglass) was previously allowed to be deployed without continuous air impermeable insulation only in dry climate zones 2B and 3B in tile roofs systems. New research has revealed that asphalt shingles can also be allowed as implemented in the new IRC 2018 with a new addition to the section for sealed attics using air permeable insulations. The new building code also permits the use of air permeable insulation without air impermeable insulation in climate zones ...


Moisture Robustness Of Eaves Solutions For Ventilated Roofs – Experimental Studies, Steinar Grynning, Silje Kathrin Asphaug, Lars Gullbrekken, Berit Time Sep 2018

Moisture Robustness Of Eaves Solutions For Ventilated Roofs – Experimental Studies, Steinar Grynning, Silje Kathrin Asphaug, Lars Gullbrekken, Berit Time

International Building Physics Conference

Ventilated pitched wooden roofs with eaves (roof overhangs) is a common building practice in the Scandinavian countries. The eaves are protecting the façade from rain, wind driven rain (WDR) and snow, and it covers the roof ventilation aperture. The eaves should be designed so that the least possible amounts of rainwater and snow enters the ventilation aperture between the roof cladding- and underlayer roofing. At the same time, adequate ventilation of the roof must be ensured to promote proper drying-out capabilities of the roof and to avoid problems of snow melt and ice formation at eaves and gutters during winter ...


Thermal Performance Of Novel Natural Ventilation Apertures In A High- Performance Single-Family House, Martha Bohm Sep 2018

Thermal Performance Of Novel Natural Ventilation Apertures In A High- Performance Single-Family House, Martha Bohm

International Building Physics Conference

Natural ventilation provides opportunities to reduce residential cooling load in summer, but increasing the operability of a façade potentially increases infiltration, which is already a source of significant winter heat load. Solving both of these simultaneously is challenging. The test building for this study was a prototype house containing a novel ventilator detail which allows for porosity for summer ventilation and a tight, insulated seal in winter. We aimed to determine whether the prototype had low enough infiltration and thermal bridging to be worthy of further laboratory testing and subsequent deployment in more buildings. The test home was blower door ...


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 ...


Stochastic Modelling Of Hygrothermal Performance Of Highly Insulated Wood Framed Walls, Lin Wang, Hua Ge Sep 2018

Stochastic Modelling Of Hygrothermal Performance Of Highly Insulated Wood Framed Walls, Lin Wang, Hua Ge

International Building Physics Conference

Recent years, the majority of building codes in North America require an energy efficient envelope to improve the building energy efficiency. There are different design strategies to achieve a higher insulation level of the wood framed building envelope, such as increasing the depth of stud cavity to accommodate thicker insulation or adding an exterior insulation while keeping the depth of stud cavity unchanged. However, the highly insulated walls may lead to a higher risk of moisture problems. The deep cavity walls will reduce the temperature of the wood sheathing, which may increase the potential for condensation and mold growth. The ...


Assessment Of Cumulative Damage Of Selected Building Envelopes Exposed To Various Environmental Effects, Václav Kočí, Jiří Maděra, Robert Černý Sep 2018

Assessment Of Cumulative Damage Of Selected Building Envelopes Exposed To Various Environmental Effects, Václav Kočí, Jiří Maděra, Robert Černý

International Building Physics Conference

Hygrothermal performance of building envelopes based on three different building materials (solid brick, high performance concrete, aerated autoclaved concrete) is assessed under climatic conditions of Prague and Atlantic City. Main objective of the paper is to evaluate the influence of cumulative damage, which was induced by means of natural weathering in 2012- 2015 period, on the long-term performance. The performance is assessed using various measures, namely time-of-wetness function, number of freeze/thaw cycles, and annual amount of energy transmitted through the envelope. The results show that thermal performance of the envelopes gets mostly better after weathering as the annual amount ...