scholarly journals Circularity concepts for offsite prefabricated energy renovation of apartment buildings

2021 ◽  
Vol 2069 (1) ◽  
pp. 012074
Author(s):  
Kalle Kuusk ◽  
Kristel Kullerkupp ◽  
Peep Pihelo ◽  
Michiel Ritzen ◽  
Ana Tisov ◽  
...  
Keyword(s):  
Window Glass ◽  
Energy Performance ◽  
Building Envelope ◽  
Full Potential ◽  
Careful Selection ◽  
Thermal Transmittance ◽  
Building Component ◽  
Materials Used ◽  
Good Possibility ◽  
Selection Of

Abstract Deep energy renovation includes the realisation of the full potential of energy performance. A circular deep renovation, which contributes to a circular built environment, is based on 100% life cycle renewable energy, and all materials used within the system boundaries are part of infinite technical or biological cycles with the lowest quality loss as possible. In the current study, the circularity potential was assessed for deep energy renovation from different aspects: circularity of materials, building component and building structure. Careful selection of materials as well as connection, position and disassembly possibilities are needed to increase the degree of circularity. This shows a good possibility to increase energy performance by using circularity principles. The window glass circularity analyse showed that, at best, the thermal transmittance of a new circular product can be more than three times lower than the original. The circular use of materials, components, and structures pose new challenges for the building physic design of building envelope structures.

scholarly journals In-situ measurements of the U-value of a ventilated wall assembly

2021 ◽  
Vol 2069 (1) ◽  
pp. 012212
Author(s):  
M Rahiminejad ◽  
D Khovalyg
Keyword(s):  
National Level ◽  
Performance Standards ◽  
Energy Performance ◽  
Building Envelope ◽  
Wall Structure ◽  
Thermal Transmittance ◽  
Ventilated Cavity ◽  
Air Space ◽  
U Value ◽  
Wall Assembly

Abstract The walls in a building envelope have the largest contact area with the exterior environment, and, therefore, a considerable portion of the thermal energy can be lost through the walls compared to the other parts of the building envelope. For energy-saving purposes, the thermal transmittance of walls is typically limited by building energy performance standards at the national level. However, the presence of a ventilated air-space behind the external cladding, which has variable hydro-dynamic behavior, can differently affect the total thermal transmittance of the entire structure. This paper aims to provide an experimental analysis of the total U-value of a ventilated wall assembly measured in a building prototype following the average and dynamic methods defined by ISO 9869-1. Differences between the calculated theoretical U-value and the measured U-value are compared. The contribution of the thermal resistance of the ventilated air-space in the total thermal transmittance of the wall assembly is also analyzed. The results show that the air movement and the enthalpy change in the ventilated cavity can affect the thermal performance of the wall structure to a certain extent.

scholarly journals Investigation of the envelope’s thermal transmittance influence on the energy efficiency of residential buildings under various Mediterranean region climates

2021 ◽  
Vol 899 (1) ◽  
pp. 012009
Author(s):  
A C Karanafti ◽  
T G Theodosiou
Keyword(s):  
Energy Efficiency ◽  
Residential Buildings ◽  
Residential Building ◽  
Energy Performance ◽  
Building Envelope ◽  
Ambient Conditions ◽  
Cooling Period ◽  
Thermal Transmittance ◽  
System A ◽  
Mediterranean Regions

Abstract Improving the energy efficiency of residential buildings is of outmost importance for reducing their environmental footprint. Recent studies demonstrate that a highly insulated building envelope may burden the building’s performance during the cooling period, especially in regions with hot summers. In this study, the energy performance of a residential building in different Mediterranean regions (Jordan, Greece, Iraq, Egypt, Syria, Morocco, Cyprus, Saudi Arabia, Libya, and Spain) is investigated. Two thermal transmittance values are applied to the building shell, a scenario with a very low one and a scenario with a higher one, to examine under which conditions the cooling performance is improved. A dynamic insulation configuration is also implemented, and its operation is studied for the cooling period of each city. It is concluded that in Southern European and Northern African regions building envelopes with lower thermal resistances perform better, while in even Southern regions an increased thermal resistance may prevent the heat from entering the building more effectively. With the switching insulation system, a great reduction in the cooling demands was reported, which reached up to 50% in Spain, and it was shown that in the southern regions the configuration’s operation should be customized to the ambient conditions to optimize its performance.

scholarly journals Developing Double Walls System to Improve Building Energy Performances in Dry Tropical Climates

2021 ◽  
Vol 16 (3) ◽  
pp. 39
Author(s):  
Etienne MALBILA ◽  
Fati ZOMA ◽  
David Y. K. TOGUYENI ◽  
Chris-veenem Methushael COMPAORE ◽  
Dieudonné Joseph BATHIEBO
Keyword(s):  
Thermal Performance ◽  
Building Materials ◽  
Construction Materials ◽  
Building Energy ◽  
Energy Performance ◽  
Building Envelope ◽  
Public Preferences ◽  
The People ◽  
Materials Used ◽  
Tropical Climates

This paper deals with building envelope thermal performance through a comparative study of the use of two types of construction materials, such as CEB and cement blocks, in order to introduce the use of double walls in sustainable buildings' construction. The building envelope participates in providing thermal comfort to users and in the optimal management of building energy consumption. This study begins with a survey of public preferences for building materials used in Burkina Faso. The results indicate that 76% of the people surveyed opt for cement blocks over local materials.  Concerning the thermal and specific energy performance, three variants of building envelope were studied: CEB walls, cement blocks and the double-wall (CEB + Cement blocks). It appears that the CEB walls are more efficient than the cement block walls. The introduction of double envelopes leads to the thermal resistance of 357.37m².K/W and reduces the heat flow from 85.32% to 90.24% compared to the wall made with CEB and cement blocks. This approach, which consists in mixing construction materials for good thermal insulation, allows improving the envelope thermal performance and the overall building energy performance.

Understructure of Passive Houses in Terms of Materials

2016 ◽  
Vol 824 ◽  
pp. 172-179
Author(s):  
Kateřina Kubenková ◽  
Marek Jašek
Keyword(s):  
Energy Performance ◽  
Building Envelope ◽  
Point Of View ◽  
Properties Of Materials ◽  
Material Solution ◽  
Passive Houses ◽  
Concrete Solution ◽  
Cost Of Materials ◽  
Final Selection ◽  
Selection Of

The overall energy performance of the building is done by selecting the structural design of the building envelope [1], [2]. At present, the builder decides for the final selection of the design (material) solution of a passive house based on mechanical properties of materials, thermal technical properties of materials and cost of materials. Currently is increasing builders who are interested in point of environmental protection in relation to the choice of materials for passive houses. The paper deals with concrete solution of substructure detail and its evaluation in terms of both thermal technical and financial point of view and also in terms of materials and their relationship to the environment.

scholarly journals Influence of Materials in Life Cycle Energy Assessment of a Six Storey Building

2019 ◽  
Vol 9 (1S3) ◽  
pp. 475-478
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Performance ◽  
Energy Simulation ◽  
Simulation Tool ◽  
Energy Assessment ◽  
Building Component ◽  
Operational Phase ◽  
Materials Used ◽  
Storey Building

Life Cycle Energy Assessment (LCEA) is one of the evaluating tools for assessing environmental impact of various types of materials used in the buildings components. The LCEA is based on reduction of total amount of energy consumed during the life cycle of building. Operational phase has been taken and the energy consumed for the phase has been evaluated in this study for three cases with respect to change in materials. This mainly focuses on the change in the energy consumption due to the usage of RCC and Wood materials in various building component such as roofs and infill walls etc. under Indian conditions. A six storey building with a plan dimension of 48m x 24m is considered. The ‘eQuest’ is the quick energy simulation tool which is widely used to calculate the whole building’s energy performance. This tool is used to estimate the energy consumption in month wise on various aspects.

Investigation of Thermal, Mechanical and Acoustic Performance of Bio-Materials Based on Plaster-Gypsum and Cork

2022 ◽  
Author(s):  
Said Bouzit ◽  
Francesca Merli ◽  
Mohammed Sonebi ◽  
Sofiane Amziane ◽  
Cinzia Buratti ◽  
...  
Keyword(s):  
Building Materials ◽  
Transmission Loss ◽  
Energy Performance ◽  
Building Envelope ◽  
Acoustic Properties ◽  
Acoustic Performance ◽  
Energy Performance Of Buildings ◽  
New Applications ◽  
Alternative Solutions ◽  
Selection Of

The building sector is one of the biggest consumers of energy in the world and it is pushing the scientific community to find various alternative solutions to solve the problem of thermal insulation of buildings. Therefore, the selection of appropriate building materials is a major challenge for improving the thermal comfort and energy performance of buildings. In this scenario, the interest of plaster-based composites as insulating materials increases, in particular for new applications, as insulators for the building envelope, and this deserves to be studied. In this investigation, new plaster-based composites with cork were produced and tested at lab scale, in order to obtain cheap solutions with improved thermo-physical and acoustic performance. The results show that it is possible to improve the thermal, mechanical, and acoustic performance of construction biomaterials by using plaster as a binder and cork as a natural reinforcement: thermal conductivity was equal to 0.097 W/m.K, the compressive strength to about 2.30 MPa, and the transmission loss to about 40 dB. Keywords: Plaster-Gypsum; Cork; Thermal, Mechanical and Acoustic Properties.

scholarly journals Transient thermal response of opaque building envelope elements: EPFL campus case study

2021 ◽  
Vol 2042 (1) ◽  
pp. 012080
Author(s):  
Mohammad Rahiminejad ◽  
Cécile Berquand ◽  
Dolaana Khovalyg
Keyword(s):  
Thermal Performance ◽  
Thermal Inertia ◽  
Thermal Response ◽  
Weather Conditions ◽  
Energy Performance ◽  
Building Envelope ◽  
Time Shift ◽  
Wall Structure ◽  
Materials Used ◽  
The Impact

Abstract The building envelope acts as a shield against varying weather conditions and modulates thermal energy flow between outdoors and indoors. The choice of layers used in the assembly impacts the heat loss and gain through the wall structure and potentially can affect the comfort indoors. Thus, the building envelope plays an essential role in the thermal performance of the building. Optimizing the cladding design in the envelope has recently become increasingly important to reach sustainable development strategies for reducing greenhouse gas emissions by 2050. This paper aims to analyze several cladding types used on the EPFL campus in Lausanne and compare their impact on the energy performance of the building envelopes. The building assemblies constructed on the EPFL campus in different years vary in composition and thermo-physical properties of the layers used. The impact of these parameters on the thermal performance of the wall assembly is evaluated by comparing the variation of heat flux and temperature fluctuations within the wall structure. The results obtained highlight the importance of the building envelope layers and materials used in the wall structure. Due to the variations in the thermal inertia of different wall assemblies, a time shift of more than 3 hours in the transient response of the building envelope to the fluctuation of the outdoor weather conditions is observed.

Impact of roof shading on building energy performance in warm & humid climatic places of India

2020 ◽  
pp. 50-64
Author(s):  
Kuladeep Kumar Sadevi ◽  
Avlokita Agrawal
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Performance ◽  
General Assumption ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Passive Cooling ◽  
Base Case ◽  
U Value ◽  
The Impact

With the rise in awareness of energy efficient buildings and adoption of mandatory energy conservation codes across the globe, significant change is being observed in the way the buildings are designed. With the launch of Energy Conservation Building Code (ECBC) in India, climate responsive designs and passive cooling techniques are being explored increasingly in building designs. Of all the building envelope components, roof surface has been identified as the most significant with respect to the heat gain due to the incident solar radiation on buildings, especially in tropical climatic conditions. Since ECBC specifies stringent U-Values for roof assembly, use of insulating materials is becoming popular. Along with insulation, the shading of the roof is also observed to be an important strategy for improving thermal performance of the building, especially in Warm and humid climatic conditions. This study intends to assess the impact of roof shading on building’s energy performance in comparison to that of exposed roof with insulation. A typical office building with specific geometry and schedules has been identified as base case model for this study. This building is simulated using energy modelling software ‘Design Builder’ with base case parameters as prescribed in ECBC. Further, the same building has been simulated parametrically adjusting the amount of roof insulation and roof shading simultaneously. The overall energy consumption and the envelope performance of the top floor are extracted for analysis. The results indicate that the roof shading is an effective passive cooling strategy for both naturally ventilated and air conditioned buildings in Warm and humid climates of India. It is also observed that a fully shaded roof outperforms the insulated roof as per ECBC prescription. Provision of shading over roof reduces the annual energy consumption of building in case of both insulated and uninsulated roofs. However, the impact is higher for uninsulated roofs (U-Value of 3.933 W/m2K), being 4.18% as compared to 0.59% for insulated roofs (U-Value of 0.33 W/m2K).While the general assumption is that roof insulation helps in reducing the energy consumption in tropical buildings, it is observed to be the other way when insulation is provided with roof shading. It is due to restricted heat loss during night.

Afterword

2020 ◽  
pp. 680-683
Author(s):  
Janice L. Waldron ◽  
Stephanie Horsley ◽  
Kari K. Veblen
Keyword(s):  
Social Media ◽  
Media Use ◽  
Careful Selection ◽  
Social Media Use ◽  
Pedagogical Tools ◽  
The Future ◽  
User Data ◽  
Selection Of ◽  
Data Surface

We all feel the implications of the force of social media—for good and for ill—in our lives and in our professional world. At the time of this writing, Facebook continues with its struggle to “clean up its act” as more revelations surrounding breaches of trust and hacked user data surface in the news and various countries attempt to hold Facebook to account. Despite this, social media use continues to grow exponentially, and the potential for responsible, ethical, and transparent social media to transform the ways in which we interact with and learn from each other increase with it. As we wait to see what the future holds for social media in society, we are reminded once again that it is the careful selection of pedagogical tools such as social media, as well the guided awareness of the challenges and benefits of those tools, that remains constant, even as tools may change, disappear, or fall out of fashion.

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