scholarly journals Towards optimum energy performance measures for existing hotels in Egypt

2016 ◽  
Author(s):  
A. Aladassy ◽  
G. Mosaad ◽  
K. Tarabieh
Keyword(s):  
Performance Measures ◽  
Energy Performance ◽  
Optimum Energy

scholarly journals Epoxy-Based/BaMnO4 Nanodielectrics: Dielectric Response and Energy Storage Efficiency

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2803
Author(s):  
Despoina I. Batsouli ◽  
Anastasios C. Patsidis ◽  
Georgios C. Psarras
Keyword(s):  
Energy Storage ◽  
Low Frequency ◽  
Interfacial Polarization ◽  
Energy Performance ◽  
Relaxation Processes ◽  
Broadband Dielectric Spectroscopy ◽  
Dielectric Data ◽  
Optimum Energy ◽  
Harvesting Systems ◽  
Energy Storage Efficiency

Compact capacitive energy storing/harvesting systems could play a key role in the urgent need for more energy-efficient technologies to address both energy and environmental issues. Therein, the purpose of the present work is to develop and investigate epoxy/BaMnO4 nanocomposites at various filler concentrations, which could be applicable as compact materials systems for energy storage and harvesting. Broadband dielectric spectroscopy was used for studying the dielectric properties and the relaxation processes of the examined nanodielectrics. The energy storing/retrieving ability of the nanocomposites was also evaluated via DC charge–discharge experiments. The coefficient of energy efficiency (neff) was found for all prepared nanocomposites to evaluate the energy performance of the systems. Dielectric data divulge the existence of two matrix-related relaxations, i.e., α-mode and β-mode, attributed to the glass-to-rubber transition of the polymer matrix and re-orientation of polar side groups, respectively. Interfacial polarization was also identified in the low-frequency and high-temperature region. The 7 phr BaMnO4 nanocomposite exhibits the best performance in terms of the stored and harvested energies compared to all systems. On the other hand, the 5 phr, 3 phr and 1 phr nanocomposites display optimum energy performance, reaching high values of neff.

scholarly journals Can Both the Economic Value and Energy Performance of Small- and Mid-Sized Buildings Be Satisfied? Development of a Design Expert System in the Context of Korea

2020 ◽  
Vol 12 (12) ◽  
pp. 4946
Author(s):  
Sean Hay Kim ◽  
Jungmin Nam
Keyword(s):  
Expert System ◽  
Performance Measures ◽  
Economic Value ◽  
Energy Performance ◽  
Rule Base ◽  
Change Scenario ◽  
Design Decision ◽  
Decision Support Model ◽  
Performance Goal ◽  
Design Expert

To design a High-Performance Building (HPB), a performance goal should be clearly set from very early design phases, and then a decision path of what performance measures have been chosen in the past stages and shall be chosen in a later stage should be visible. In particular, for small- and mid-sized HPBs that are constructed with a smaller budget, if applicable performance measures are subjective to change, supplementary design costs can increase due to intermittent performance evaluations. To help this situation, we are developing a design expert system for small- and mid-sized buildings that pursues a balance between economic value and energy performance. The economy rule base suggests the most economic building volumetry and form in view of the site context, while the energy rule base suggests a series of energy-sensitive design variables and their options. Based on these rule bases, the expert system presents multiple design decision paths. The design decision support model of the inference engine helps stakeholders choose a preferred design path out of multiple paths, compare the paths, trace back the paths, and effectively revoke past decisions. An actual small retail and office construction project was chosen as a test case to compare the utility and robustness of the pilot system against the conventional design practice. In case of a rather risky design change scenario, the decision-making using the pilot expert system outperforms the conventional practice in terms of selecting designs with a good balance between economic value and energy performance. In addition, it was easier for users of the pilot system to forecast risks upon critical design changes and, in turn, to identify reasonable alternatives.

scholarly journals Enhanced heat exchanger layout for optimum energy performance in solar thermal ORC-based unit

2019 ◽  
Author(s):  
Diego Vittorini ◽  
Roberto Cipollone ◽  
Roberto Carapellucci
Keyword(s):  
Heat Exchanger ◽  
Energy Performance ◽  
Solar Thermal ◽  
Optimum Energy

Determining the Optimum Energy Performance of an On-Board Cryogenic Cooler

2021 ◽  
pp. 1-8
Author(s):  
Dmitriy A. Uglanov ◽  
Viktor V Urlapkin ◽  
Sergey S Korneev ◽  
Elizaveta A. Marakhova
Keyword(s):  
Energy Performance ◽  
Optimum Energy ◽  
Cryogenic Cooler

scholarly journals Cost-optimal energy performance measures in a new daycare building in cold climate

2018 ◽  
Vol 38 (2) ◽  
pp. 104-122 ◽  
Author(s):  
Paula Sankelo ◽  
Juha Jokisalo ◽  
Jonathan Nyman ◽  
Juha Vinha ◽  
Kai Sirén
Keyword(s):  
Performance Measures ◽  
Energy Performance ◽  
Cold Climate ◽  
Optimal Energy

Cost Optimality and/or Sustainability in our Building's Life

2014 ◽  
Vol 899 ◽  
pp. 87-92
Author(s):  
Krisztina Severnyak
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Minimum Energy ◽  
Energy Performance ◽  
Construction Technology ◽  
The European Union ◽  
Optimum Energy ◽  
Minimum Requirements ◽  
Optimum Cost ◽  
Traditional Natural

As energy efficiency is becoming an increasingly important feature, buildings are expected to comply with several criteria and requirements and these criteria are changed and extended with time. The Directive 2002/91/EC of the European Parliament and Commission on the energy performance of buildings and the Directive 2010/31/EU request Member States to apply minimum energy performance requirements. These minimum requirements are indeed applied all over the European Union and should be regularly reviewed. Our research aimed at clarifying whether optimum cost and/or energy efficiency represents the next step towards actual energy efficiency. The Directive brought forth an aspect that should have been prioritized long ago already: Are the construction and refurbishment of buildings in Europe economically feasible? The methodology prescribed by the Directive leaves several questions open and provokes further research. The methodology uses costs only as the basis for examining energy consumption and emissions related to already existing, newly constructed or refurbished buildings or refurbishment options. Optimum cost does not necessarily correspond to optimum energy or environmental performance. The price of materials and equipment built in does not always reflect the energy built in or environmental advantages. Subsidies to promote energy efficiency may bias optimum costs. Viewing optimums from the broader aspect of energy consumption, proper results are only yielded by analyses completed for the entire life cycle of buildings. This way, we may decide which characteristics attribute more to a low energy and emission status, i.e. state-of-the-art construction technology or traditional, natural constructing methods such as those used for „conservative eco buildings.” [1]

scholarly journals Self-Organised Approach to Designing Building Thermal Insulation

2020 ◽  
Vol 12 (14) ◽  
pp. 5764
Author(s):  
Purvesh Bharadwaj ◽  
Ljubomir Jankovic
Keyword(s):  
Energy Efficiency ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Energy Performance ◽  
Three Dimensions ◽  
Insulation Material ◽  
New Approach ◽  
Agent Based ◽  
Optimum Energy ◽  
Building Heat

Traditionally, the uniform application of thermal insulation is practised within the built environment sector to achieve desired building regulation standards for energy efficiency. However, that approach does not follow the building heat loss field, and it is therefore poorly matched to the actual heat loss from the building, thus achieving sub-optimum energy performance. This research aims to visualise building heat loss field in three dimensions and to create self-organised thermal insulation patterns that are proportional in thickness to the intensity of heat loss. This is achieved using a 3D agent-based model, in which each agent that represents a miniature object of thermal insulation moves up the gradient of the heat loss representation and competes for its position with the neighbouring thermal insulation components, depending upon the gradient intensity. This creates a self-organised thermal insulation pattern through the competition between the thermal insulation components and through overcrowding in the areas with higher heat loss intensity. This helps to visualise the heat loss field and create a representation of thermal insulation that is ideally matched to it. The result is assessed for its energy performance using a conventional energy performance analysis. That analysis shows that this approach leads to reductions in energy consumption and carbon emissions in comparison with the conventional approach that uses the same amount of thermal insulation material. The overall result increases our understanding of 3D heat loss and introduces a new approach for designing building thermal insulation.

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