Numerical Study of Transfer in Building Envelope Components

2015 ◽  
pp. 128-189
Keyword(s):  
Numerical Study ◽  
Building Envelope

Numerical Study of Basalt Fibre Cloth Strengthened Structural Insulated Panel under Windborne Debris Impact

2016 ◽  
Vol 846 ◽  
pp. 446-451 ◽  
Author(s):  
Qing Fei Meng ◽  
Hong Hao ◽  
Wen Su Chen
Keyword(s):  
Numerical Model ◽  
Structural Damage ◽  
Numerical Study ◽  
Building Envelope ◽  
Basalt Fibre ◽  
Structural Wall ◽  
Windborne Debris ◽  
Strong Winds ◽  
The Impact ◽  
Debris Impact

Strong winds happen around the world every year and cause enormous damages and losses. Besides large wind pressure, impact from windborne debris on building envelope is a major source of structural damage in strong winds. The debris lifted and carried by wind impacting on building envelop may create openings on building envelope which increase internal pressure of the building, and lead to roof lifting and even total building collapse. Preventing impact damage to structural wall and roof is therefore critical in extreme wind conditions. On the other hand Structural Insulated Panel (SIP) with Oriented Strand Board (OSB) skins is popularly used in the building industry. Previous studies revealed that such SIP panels had weak impact resistant capacity and do not meet the design requirements to resist windborne debris impact specified in Australian Standard (AS/NZS1170.2:2011) for their applications in cyclonic regions. To increase the capacity of such SIP panels against windborne debris impact, basalt fibre cloth was used to strengthen the panel. Laboratory tests found that SIP strengthened with basalt fibre cloth was effective in increasing its impact-resistant capacity. This paper presents the development of a reliable numerical model to predict the impact responses of basalt fibre cloth strengthened SIP panel in LS-DYNA. The accuracy of the numerical model is verified by comparing the numerical and experimental results. The validated numerical model provides a reliable tool to predict basalt fibre cloth strengthened SIPs.

scholarly journals Numerical study of the effect of DSF walls geometrical shape on heat transfer

2020 ◽  
Vol 170 ◽  
pp. 01005
Author(s):  
Mohamed Elamine GHEDHAB ◽  
Ikram El ABBASSI ◽  
Rafik ABSI ◽  
Yannick MÉLINGE
Keyword(s):  
Heat Exchange ◽  
Numerical Study ◽  
Energy Performance ◽  
Building Envelope ◽  
Geometrical Shape ◽  
Reference Case ◽  
Basic Model ◽  
Definition Of ◽  
Main Component ◽  
Gains And Losses

The building envelope is an important element that influences energy performance, both in terms of gains and losses. Indeed, much research has focused on improving and optimizing this element. The façade represents the main component of the envelope; it plays a crucial role lying in the protection of the internal environment of the building from external climate variations, by providing thermal comfort to its occupants. In order to gain in energy efficiency, a numerical investigation (CFD) on the influence of the geometric shape of façades on heat exchange in the building is carried out in this work. More particularly, the study will be established on double skin façades (DSF) representing the most commonly used facade typology on high-rise buildings. The simulations will be carried out taking into account the climate in Paris region. The first part will be dedicated to the definition of the basic model, which will be considered as a reference case with plan surfaces on the outside and inside of the building. In the second part, the influence of the shape of the external façade on heat exchange will be discussed.

Numerical study of the energy efficiency of the building envelope containing multi-alveolar structures under Tunisian weather conditions

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Nour Lajimi ◽  
Nour Ben Taher ◽  
Noureddine Boukadida
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Thermal Behavior ◽  
Thermal Insulation ◽  
Numerical Study ◽  
Thermal Inertia ◽  
Building Envelope ◽  
Winter Period ◽  
Alveolar Structure ◽  
Major Interest

Abstract The study of the thermal inertia of buildings is a subject of major interest. The thermal insulation and the nature of the wall sensitively modify the inertia of the building and are the solutions to improve the energy efficiency of the envelope. The roof is well exposed to solar radiation in summer and contributes to significant losses in winter due to convective exchanges. To lead to a thermal comfort, a thermal insulation is necessary. In this context, we carry out a numerical study of the thermal behavior of a building with two zones in variable meteorological conditions for a Tunisian climate (region of Sousse) based on the thermoelectric analogy and using the nodal method as a numerical method. The object of this work is to study the effect of the thermal inertia of the roof equipped with a multi-alveolar structure on the thermal behavior of the air inside the room and on its energy consumption. Taking into account the energy input of occupant, a complete model was established to increase the accuracy of the calculations. The results show that the multi-alveolar structure placed on the outside of the roof reduces energy consumption during the winter period when the alveolar structure is placed in the conductive direction and during the summer period when the alveolar structure is placed in the insulate direction.

Comparison of Numerical HMT Codes to Simulate MBV Test of Hemp-Earth Composites

2022 ◽  
Author(s):  
Sana Khaled ◽  
Marjorie Bart ◽  
Sophie Moissette ◽  
Florence Collet ◽  
Sylvie Prétot ◽  
...  
Keyword(s):  
Indoor Air ◽  
Building Materials ◽  
Numerical Study ◽  
Water Vapor Permeability ◽  
Building Envelope ◽  
Vapor Permeability ◽  
Building Envelopes ◽  
Classical Models ◽  
Points Of View ◽  
Adsorption Curve

Bio-based and earth materials are growingly used for the building envelopes because of their numerous benefits such as slight environmental impact, great hygrothermal performances, effective regulation of the perceived indoor air quality and human comfort. In such materials, the phenomenon of mass transfer is complex and has a great impact on the performance of building envelope. Therefore, it is important to identify and understand the hygrothermal phenomena to be able to simulate accurately the envelope behavior. Nevertheless, the classical models that depict hygric transport within building materials seem not accurate enough for bio-based materials as they are simplified on several points of view. The correlation that exists between water content and relative humidity is mostly simplified and is modeled by a single curve, the hygric storage capacity is often overstated and the hysteresis is neglected. This paper deals with numerical study of hygric transfer within hemp-earth building material by using WUFI® Pro 6.5, a commercial software, and TMC code developed at the LGCGM (Moissette and Bart, 2009) . This code was validated regarding EN 15026 standard (Moissette and Bart, 2009) and has evolved over the years by integrating the hysteresis phenomena (Aït-Oumeziane et al., 2015). Thus, a significant enhancement of the numerical simulations on desorption phase was shown. This study investigates the simulation of MBV test performed on a hemp-earth material for which only the adsorption curve is known as input. Missing parameters (water vapor permeability and desorption curve) are fitted considering the first cycle of MBV test with TMC code. Then, MBV test is simulated with WUFI® Pro 6.5 and TMC code without and with hysteresis. The results highlight the need to include hysteresis to accurately simulate dynamic hygric phenomena, and show that it is possible to find missing parameters by fitting dynamic solicitations.

Building envelope with a new aerogel-based insulating rendering: Experimental and numerical study, cost analysis, and thickness optimization

2015 ◽  
Vol 159 ◽  
pp. 490-501 ◽  
Author(s):  
Mohamad Ibrahim ◽  
Pascal Henry Biwole ◽  
Patrick Achard ◽  
Etienne Wurtz ◽  
Guillaume Ansart
Keyword(s):  
Cost Analysis ◽  
Numerical Study ◽  
Building Envelope ◽  
Thickness Optimization

scholarly journals Investigation Of The Improvement Building Envelope Impact On Energy Consumption Using Energy Audit

2020 ◽  
Vol 307 ◽  
pp. 01031
Author(s):  
Fatiha Mokhtari ◽  
Djaffar Semmar ◽  
Mourad Chikhi ◽  
Nachida Kasbadji Merzouk ◽  
Soumia Oukaci
Keyword(s):  
Energy Consumption ◽  
Numerical Study ◽  
Winter Season ◽  
Building Energy ◽  
Building Envelope ◽  
Energy Audit ◽  
Effective Evaluation ◽  
Heating And Cooling ◽  
Space Cooling ◽  
Reduction Of Energy Consumption

Effective evaluation on the thermal performance of building envelope plays an important role towards the reduction of energy consumption for space cooling and heating. In order to estimate the energy consumption for cooling, heating and the whole energy saving on the envelop designs; an improvements of thermal performances of this envelope are introduced. This trend is performed using a numerical study. The building is an office part of the Unit of Developmental for Solar Equipment (UDES) located at Bou-Ismail, an Algerian coastal city. Through the software PLEADES-COMFIE, building energy has been evaluated. The simulation results illustrate that; adding 90 mm thick insulation on the opaque walls and double glazing on windows produce a maximum saving of 50% and 10% annual energy required in heating and cooling. Also these proposed performances allow increasing indoor temperate of 4°C in winter season and decreasing.

scholarly journals Impact of Integrating Solar Technique On Buildings'thermal Comfort and Energy Consumption: A Numerical Study

2021 ◽  
Vol 321 ◽  
pp. 02001
Author(s):  
Sahar Ben Romdhane ◽  
Zohir Younsi ◽  
Hassan Naji ◽  
Nejla Mahjoub Said ◽  
Abdelmajid Jemni
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Numerical Study ◽  
Renewable Energy Sources ◽  
Building Envelope ◽  
Solar Irradiation ◽  
Main Role ◽  
Renewable Energy Resources ◽  
Simple Method ◽  
Trombe Wall

In the context of shrinking non-renewable energy resources and reducing greenhouse gas emissions, it turns out necessary to drop energy consumption and move towards renewable energy sources. In this regard, solar energy being an abundant source of energy, it can play an important role in the building energy supply. This energy supplement can come from passive solar technologies, of which the Trombe wall is one of the passive models most used in the building envelope, whose main role is to ensure net gains. Thereby, the main aim of this study is to highlight the use of a simple method to reduce the buildings heating demand. For this, a 3-D model was developed through scSTREAM V2020 software to investigate the thermal performance of a classical Trombe wall in winter while targeting desirable indoor thermal comfort conditions. In addition, studies have been performed to optimize the energy consumption It turned out that, in the presence (respectively absence) of solar irradiation, the Trombe wall acts as a solar absorber (respectively a heat source).

scholarly journals Numerical Study on Energy-Saving Performance of a New Type of Phase Change Material Room

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3874
Author(s):  
Rongda Ye ◽  
Xiaoming Fang ◽  
Zhengguo Zhang
Keyword(s):  
Energy Consumption ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Expanded Graphite ◽  
Building Envelope ◽  
The South ◽  
Ventilated Cavity ◽  
South Wall

The thermal performance of a phase change energy storage building envelope with the ventilated cavity was evaluated. CaCl2·6H2O-Mg(NO3)2·6H2O/expanded graphite (EG) was employed to combined with the building for year-round management. The energy consumption caused by the building under different influence parameters was evaluated numerically. The results indicated that CaCl2·6H2O-8wt %Mg(NO3)2·6H2O/EG should be installed on the south wall for the heating season, while CaCl2·6H2O-2wt %Mg(NO3)2·6H2O/EG should be integrated on the roof for the cooling season. When the air layer was ventilated and the south wall was coated with the solar absorbing coating, the room could save approximately 30% of energy consumption. Moreover, the energy consumption increased with an increase in the air layer thickness, and the air layers played a different role in the building envelope. The optimal value of the flow rate between air layer 2, air layer 3, and the room was 0.09 m3/s. To reduce the energy consumption, the phase change materials (PCMs) with large and small thermal conductivity should be installed in the south wall and roof, respectively. In general, the phase change energy storage building envelope with the ventilated cavity can save energy during the heating and cooling seasons.

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