Achieving Energy Efficient Building through Energy Performance Analysis of Building Envelope in Student Housing

In the present study a GUI tool for the prediction of building energy performance based on a three-layered BP neural network and MATLAB was developed. The inputs for this tool are the 18 building envelope parameters. The outputs are building heating, cooling and total energy consumptions and the energy saving rate. Compared with the complicated mathematical equations, this tool provides a very easy and effective method for students to learn the effects of building envelope performance parameters on the building energy performance. Thus, this tool can be used in building physics and building energy efficiency courses for the design of energy efficient building.

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BIM and BEM Methodologies Integration in Energy-Efficient Buildings Using Experimental Design

Buildings ◽

10.3390/buildings11100491 ◽

2021 ◽

Vol 11 (10) ◽

pp. 491

Author(s):

Jorge González ◽

Carlos Alberto Pereira Soares ◽

Mohammad Najjar ◽

Assed N. Haddad

Keyword(s):

Experimental Design ◽

Energy Efficient ◽

Thermal Characteristics ◽

Energy Performance ◽

Building Envelope ◽

Climatic Zones ◽

Energy Efficient Buildings ◽

Energy Modelling ◽

Building Information ◽

Energetic Performance

Linking Building Information Modelling and Building Energy Modelling methodologies appear as a tool for the energy performance analysis of a dwelling, being able to build the physical model via Autodesk Revit and simulating the energy modeling with its complement Autodesk Insight. A residential two-story house was evaluated in five different locations within distinct climatic zones to reduce its electricity demand. Experimental Design is used as a methodological tool to define the possible arrangement of results emitted via Autodesk Insight that exhibits the minor electric demand, considering three variables: Lighting efficiency, Plug-Load Efficiency, and HVAC systems. The analysis concluded that while the higher the efficiency of lighting and applications, the lower the electric demand. In addition, the type of climate and thermal characteristics of the materials that conform to the building envelope have significant effects on the energetic performance. The adjustment of different energetic measures and its comparison with other climatic zones enable decision-makers to choose the best combination of variables for developing strategies to lower the electric demand towards energy-efficient buildings.

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Understanding the Reasons behind the Energy Performance Gap of an Energy-Efficient Building, through a Probabilistic Approach and On-Site Measurements

Energies ◽

10.3390/en14196178 ◽

2021 ◽

Vol 14 (19) ◽

pp. 6178

Author(s):

Pierryves Padey ◽

Kyriaki Goulouti ◽

Guy Wagner ◽

Blaise Périsset ◽

Sébastien Lasvaux

Keyword(s):

Energy Efficient ◽

Probabilistic Approach ◽

Energy Performance ◽

High Energy ◽

Performance Gap ◽

Post Evaluation ◽

Energy Efficient Buildings ◽

Ex Post ◽

The Difference ◽

Energy Efficient Building

The performance gap, defined as the difference between the measured and the calculated performance of energy-efficient buildings, has long been identified as a major issue in the building domain. The present study aims to better understand the performance gap in high-energy performance buildings in Switzerland, in an ex-post evaluation. For an energy-efficient building, the measured heating demand, collected through a four-year measurement campaign was compared to the calculated one and the results showed that the latter underestimates the real heating demand by a factor of two. As a way to reduce the performance gap, a probabilistic framework was proposed so that the different uncertainties of the model could be considered. By comparing the mean of the probabilistic heating demand to the measured one, it was shown that the performance gap was between 20–30% for the examined period. Through a sensitivity analysis, the active air flow and the shading factor were identified as the most influential parameters on the uncertainty of the heating demand, meaning that their wrong adjustment, in reality, or in the simulations, would increase the performance gap.

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Energy efficient building envelope using waste PET in concrete

MATEC Web of Conferences ◽

10.1051/matecconf/202030701022 ◽

2020 ◽

Vol 307 ◽

pp. 01022

Author(s):

Gitanjali Thakur ◽

Mohamad Asalam ◽

Mohammed El Ganaoui

Keyword(s):

Thermal Conductivity ◽

Energy Efficient ◽

Chemical Resistance ◽

Concrete Block ◽

Building Envelope ◽

Environmental Threat ◽

Concrete Blocks ◽

Global Threat ◽

Partial Weight ◽

Energy Efficient Building

One of the major environmental threat in the world today is the increased production of plastic and its usage. The inept plastic waste management system with regard to its recycling and energy recovery in the developing countries creates a global threat as a major land and water body pollutant. However, its durability, thermal properties, and chemical resistance make plastics an alternate choice as a building material. This study investigates the use of plastic in concrete mixture with an objective to improve the thermal performance of the building. The shredded plastic fibers from plastic bottles (polyethylene terephthalate, PET) were used as a partial weight replacement (2.5%, 5%, and 7.5%) of coarse aggregate in concrete blocks. The cubes were cast using the Indian standards (IS 456) and the essential tests were performed. Additionally, experiments were designed to investigate the change in the thermal conductivity of the concrete block due to the varying amount of plastic. It was found that the use of PETs affected the compressive strength and also decreased the thermal conductivity of the concrete blocks. The experimental results suggest that PETs can be used in the construction of energy-efficient building to handle the environmental concerns because of its abundance.

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Comparative thermal performance of static sunshade and brick cavity wall for energy efficient building envelope in composite climate

Thermal Science ◽

10.2298/tsci1403925c ◽

2014 ◽

Vol 18 (3) ◽

pp. 925-934 ◽

Cited By ~ 5

Author(s):

Meghana Charde ◽

Sourabh Bhati ◽

Ayushman Kheterpal ◽

Rajiv Gupta

Keyword(s):

Energy Consumption ◽

Air Temperature ◽

Indoor Air ◽

Energy Efficient ◽

Building Envelope ◽

Combined Effect ◽

Cavity Wall ◽

Outdoor Air ◽

Reduce Energy Consumption ◽

Energy Efficient Building

Energy efficient building technologies can reduce energy consumption in buildings. In present paper effect of designed static sunshade, brick cavity wall with brick projections and their combined effect on indoor air temperature has been analyzed by constructing three test rooms each of habitable dimensions (3.0 m ? 4.0 m ? 3.0 m) and studying hourly temperatures on typical days for one month in summer and winter each. The three rooms have also been simulated using a software and the results have been compared with the experimental results. Designed static sunshade increased indoor air temperature in winter while proposed brick cavity wall with brick projections lowered it in summer. Combined effect of building elements lowered indoor air temperature in summer and increased it in winter as compared to outdoor air temperature. It is thus useful for energy conservation in buildings in composite climate.

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Evaluation of Thermal Properties of Cement-Exfoliated Vermiculite Blocks as Energy Efficient Building Envelope Material

Journal of Testing and Evaluation ◽

10.1520/jte20170520 ◽

2018 ◽

Vol 47 (5) ◽

pp. 20170520 ◽

Cited By ~ 1

Author(s):

Lovelyn Theresa Innocent ◽

Velraj Ramalingam

Keyword(s):

Thermal Properties ◽

Energy Efficient ◽

Building Envelope ◽

Envelope Material ◽

Energy Efficient Building

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Energy Efficient Improvements of Existing Buildings through Building Envelope Upgrade Case Study of High Rise Block of Flats on 76, Boulevard Partizanski Odredi in Karpos IV, Skopje

South East European Journal of Architecture and Design ◽

10.3889/seejad.2016.10020 ◽

2016 ◽

Vol 2016 ◽

pp. 1-180

Author(s):

Katerina Petrushevska

Keyword(s):

Energy Efficiency ◽

Energy Efficient ◽

Energy Performance ◽

Building Envelope ◽

Living Room ◽

Building Stock ◽

Existing Building ◽

High Rise ◽

Class B

AIM: This research examines the important issue of energy efficient improvements to the existing building stock through building envelope upgrade. To facilitate this, the energy performance characteristics of the existing building stock were identified with a view to establishing an existing building stock type, where building envelope upgrades can contribute to a higher level of energy efficiency improvements. The literature review along with the selected building precedents was used to establish the best current practice for building envelope upgrades.MATERIAL AND METHODS: Established building precedents and identified best practice for building envelope upgrade, a high rise block of flats was identified and used as a case study, with the current and predicted, following building envelope upgrade, energy performance of the building calculated. This has allowed us to identify the possible energy efficiency improvements for this type of building following the building envelope upgrade. RESULTS: In the projected case, the building with energy class - "D" become class "B". In addition, increased quality of the living room in the attic was enabled. It was possible to obtain a decrease of the heating energy from 130.76 kWh/m²a to 37.73 kWh/m²a or to jump in the class "B" of energetic passport.CONCLUSION: This research contributes to the local implementation of the global agenda for sustainable development, design and construction, and it demonstrates the possible way and level of energy efficiency improvements to the least efficient building stock through existing building envelope upgrade.

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Energy Efficiency Measures Applied to Heritage Retrofit Buildings: A Simulated Student Housing Case Study in Vienna

Heritage ◽

10.3390/heritage4040215 ◽

2021 ◽

Vol 4 (4) ◽

pp. 3919-3937

Author(s):

Essam Elnagar ◽

Simran Munde ◽

Vincent Lemort

Keyword(s):

Energy Efficiency ◽

Energy Efficient ◽

Energy Demand ◽

Energy Performance ◽

Building Envelope ◽

Positive Energy ◽

Energy Status ◽

Pv System ◽

Energy Efficiency Measures ◽

Efficiency Measures

One pavilion was selected for deep retrofitting from the Otto Wagner area situated in the west of Vienna. The retrofitting process involves sustainable and energy-efficient construction to improve the energy performance and energy production potential of the building while preserving the cultural heritage and significance. This four-story pavilion was re-designed according to the proposed regulations of a net positive energy university building to become a student residence. Architectural, building envelope, and engineering interventions along with various changes were simulated through the Sefaira tool in the SketchUp model. These included: optimization of the U-values of the roof, walls, and floor; the addition of different layers of sustainable energy-efficient insulation materials to decrease the overall energy demand. The specific energy demands for heating, cooling, and lighting were decreased in the proposed model to reduce the total energy use intensity from 248.9 kWh/(m2 year) to 54.3 kWh/(m2 year) resulting in a 78.2% reduction. The main goal of this study is to try and achieve a net positive energy status building as part of the Otto Wagner area by improving the building envelope and integrating renewable energies. A total of 22.5% of the annual energy consumption was generated by the designed PV system. The selected building achieved the passive house standards in Austria by optimizing the energy performance with the proposed energy efficiency measures.

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