scholarly journals A New Tool for Building Energy Optimization: First Round of Successful Dynamic Model Simulations

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6429
Author(s):  
Giacomo Chiesa ◽  
Francesca Fasano ◽  
Paolo Grasso
Keyword(s):  
Weather Conditions ◽  
Building Energy ◽  
Model Verification ◽  
Sensor Data ◽  
Net Energy ◽  
Dynamic Simulations ◽  
Energy Technologies ◽  
Building Models ◽  
Energy Needs ◽  
Building Energy Optimization

Several tools and pieces of software support building energy modelling for optimization, certification and comparisons of different scenarios and usages. Nevertheless, the consistent rise in accessible computational power and the expansion of ICT are pushing the development of new software functionalities and tools able to support cross-disciplinary work on smart building optimization. This paper introduces a new platform (under development) that combines the EnergyPlus dynamic simulation tool with extra-functionalities and pre-defined usage scenarios based on automatic actions to manage massive simulations and correlation analyses. The tool’s utility was tested in three experiments, with goals that we consider to be fundamental requirements: comparing simple retrofit actions to reduce net energy needs; analyzing the free-running potential of a demo building and the impacts of different low-energy technologies in terms of increasing thermal comfort (shading and ventilative cooling); and comparing measured sensor data indicators with simulated ones under real weather conditions for model verification. The results demonstrate the ability of the tool to automatically generate hundreds of EnergyPlus input building models by acting on building geometry; we focused on the most common uses for parametric dynamic simulations. Additionally, the way in which the tool combines the automatic modification of the building’s design and the parallel launching of multiple simulations allows the labor to be reduced. The user can execute complex tasks without spending any time working with model editing software and aggregating the results from multiple simulations.

scholarly journals The effectiveness of dayligting through the toplighting design in large-volume building models

2021 ◽  
Vol 6 (2) ◽  
pp. 223-234
Author(s):  
Ariani Mandala ◽  
E. B. Handoko Sutanto ◽  
Amirani Ritva Santoso
Keyword(s):  
Experimental Research ◽  
Large Volume ◽  
Research Method ◽  
Distribution Patterns ◽  
Building Energy ◽  
Building Models ◽  
Energy Needs ◽  
Roof Area ◽  
Standard Value ◽  
Coefficient Of Uniformity

The utilization of daylighting as an effort to reduce the usage of building energy needs to be optimized. This is because, low-rise buildings with large volumes require specific strategies for proper light distribution throughout the space. Hence, this study aims to explore and compare the effectiveness of daylighting in the openings design of skylight, roof monitor, and sawtooth in large-volume buildings in Bandung. The effectiveness is assessed by examining lighting performance based on distribution patterns, the value of Daylight Factor (DF), and the Coefficient of Uniformity (CU). Experimental research method with simulation program known as Velux Daylight Visualizer 3.0 is used to present and analyze the lighting data. The results showed that the type, position (openings' height and distance), as well as the opening direction affected the distribution patterns and daylighting performance. Based on the simulation, the skylight opening is the most effective in meeting the standard value of Daylight Factor (> 2%) and Coefficient of Uniformity (CU min. 0.3 and DF min. 0.8%). Thus, space and openings model with a percentage roof area of 16.3% in the simulation can be used as a reference for large-volume buildings because, it meets the requirements of Daylight Factor value and sufficient Coefficient of Uniformity.  

The prioritization of renewable energy technologies in Pakistan: An urgent need

2021 ◽  
pp. 81-103
Author(s):  
Leezna Saleem ◽  
Imran Ahmad Siddiqui ◽  
Intikhab Ulfat
Keyword(s):  
Renewable Resources ◽  
Fossil Fuels ◽  
Renewable Resource ◽  
Energy System ◽  
The Past ◽  
Energy Technologies ◽  
Energy Needs ◽  
Environmental Criteria ◽  
Populous Country ◽  
Selection Of

Pakistan is the world's sixth most populous country, currently facing the worst energy crisis. Although rich in renewable resources, Pakistan's energy system relies mainly on fossil fuels and imported energy for its energy needs. This study aims to use an analytical hierarchy pro-cess to prioritize six renewable technologies for Pakistan, with four criteria and thirteen subcriteria. The results indicate that solar power is particularly well suited for Pakistan, as it gained 42% priority weightage in the final aggregation. Wind energy is ranked second with a priority weight of 24%, followed by hydro 13%, biomass 9%, ocean 8% and geothermal en-ergy 3%. Solar and wind energies accounted for nearly 66% of the total weightage. This result highlighted the significance of economic criteria for the selection of renewable technologies in Pakistan, with around 43% priority weightage. Environmental criteria gained 19% whereas socio-political criteria registered 14% and technical criteria 23% priority weightage. During the potential assessment of the research, it was concluded that although renewable resource development has not been allocated sufficient attention in Pakistan in the past, if the correct decisions are taken regarding the exploitation of these resources, this can remedy the country's hazardous dependence on fossil fuel and imported energy.

scholarly journals Video Scanning Hartmann Optical Testing of State-of-the-Art Parabolic Trough Concentrators

Solar Energy ◽  
2006 ◽  
Author(s):  
Tim Wendelin ◽  
Ken May ◽  
Randy Gee
Keyword(s):  
Technology Development ◽  
Scale Up ◽  
Test System ◽  
Optical Testing ◽  
Parabolic Trough ◽  
Energy Technologies ◽  
Energy Needs ◽  
World Energy ◽  
Optical Test ◽  
And Performance

Significant progress has been made recently in solar parabolic trough technology development and deployment. Part of this success is due to the changing world energy scenario and the recognition that viable renewable energy technologies can play a role in supplying world energy needs. Part is also due to ongoing collaborative efforts by industry and the Department of Energy’s (DOE) Concentrating Solar Power Program (CSP) to enhance the state of the technology in terms of both cost and performance. Currently, there are two trough concentrator projects which the DOE CSP program is supporting. One company, Solargenix, is developing a design to be used in a 64MW plant outside of Boulder City, Nevada. This design is based on the original LUZ LS-2 trough concentrators employed at the Solar Electric Generating Systems (SEGS) plants in Southern California. Another company, Industrial Solar Technology (IST), is working on a scale-up of their design used historically for process heat applications. Very different from the LS-2 approach, this design is still in the research and development stages. One way in which the DOE CSP parabolic trough program assists industry is by providing optical testing and qualification of their concentrator designs. This paper describes the Video Scanning Hartmann Optical Test System (VSHOT) used to optically test both of these designs. The paper also presents the results of tests performed in the past year and what impact the testing has had on the developmental direction of each design.

Research on the Integration of Energy Economic Model and Urban Energy Model

2021 ◽  
Vol 3 (6) ◽  
pp. 15-17
Author(s):  
Yaozhong Zu ◽  
Keyword(s):  
Greenhouse Gas ◽  
Building Energy ◽  
Urban Environments ◽  
Interdisciplinary Studies ◽  
Energy Models ◽  
Energy Needs ◽  
Urban Energy ◽  
Energy Economic Model ◽  
High Level ◽  
Building Level

In order to explore the strategy on urban energy and reduction of greenhouse gas, a large number of energy models have been developed by interdisciplinary studies. Mixed patterns are particularly useful as a result that they incorporate more dynamics to simulate the relevant high-level decisions and the provided actual results by building-level factors. However, space and spatial energy models are not often linked, which ignores the spatial impact of energy and emission policies in urban environments. The application of this method shows how it can be used to assess how different policies interact with other and affect building energy needs and greenhouse gas emissions.

Nanotechnology and Polymer Solar Cells

2014 ◽  
pp. 384-405
Author(s):  
Gavin Buxton
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Photovoltaic Performance ◽  
Nanoscale Structures ◽  
Energy Technologies ◽  
Self Assembling ◽  
Polymer Photovoltaics ◽  
Energy Needs ◽  
Novel Applications

In response to environmental concerns there is a drive towards developing renewable, and cleaner, energy technologies. Solar cells, which harvest energy directly from sunlight, may satisfy future energy requirements, but photovoltaic devices are currently too expensive to compete with existing fossil fuel based technologies. Polymer solar cells, on the other hand, are cheaper to produce than conventional inorganic solar cells and can be processed at relatively low temperatures. Furthermore, polymer solar cells can be fabricated on surfaces of arbitrary shape and flexibility, paving the way to a range of novel applications. Therefore, polymer solar cells are likely to play an important role in addressing, at least in some small part, man’s future energy needs. Here, the physics of polymer photovoltaics are reviewed, with particular emphasis on the computational tools which can be used to investigate these systems. In particular, the authors discuss the application of nanotechnology in self-assembling complex nanoscale structures which can be tailored to optimize photovoltaic performance. The role of computer simulations, in correlating these intricate structures with their performance, can not only reveal interesting new insights into current devices, but also elucidate potentially new systems with more optimized nanostructures.

Nanotechnology and Polymer Solar Cells

2013 ◽  
pp. 231-253
Author(s):  
Gavin Buxton
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Photovoltaic Performance ◽  
Nanoscale Structures ◽  
Energy Technologies ◽  
Self Assembling ◽  
Polymer Photovoltaics ◽  
Energy Needs ◽  
Novel Applications

In response to environmental concerns there is a drive towards developing renewable, and cleaner, energy technologies. Solar cells, which harvest energy directly from sunlight, may satisfy future energy requirements, but photovoltaic devices are currently too expensive to compete with existing fossil fuel based technologies. Polymer solar cells, on the other hand, are cheaper to produce than conventional inorganic solar cells and can be processed at relatively low temperatures. Furthermore, polymer solar cells can be fabricated on surfaces of arbitrary shape and flexibility, paving the way to a range of novel applications. Therefore, polymer solar cells are likely to play an important role in addressing, at least in some small part, man’s future energy needs. Here, the physics of polymer photovoltaics are reviewed, with particular emphasis on the computational tools which can be used to investigate these systems. In particular, the authors discuss the application of nanotechnology in self-assembling complex nanoscale structures which can be tailored to optimize photovoltaic performance. The role of computer simulations, in correlating these intricate structures with their performance, can not only reveal interesting new insights into current devices, but also elucidate potentially new systems with more optimized nanostructures.

scholarly journals A Study on Energy and Cost Efficiency for Existing Hotel Buildings in Turkey

2019 ◽  
Vol 111 ◽  
pp. 03037
Author(s):  
Merve Atmaca ◽  
Zerrin Yýlmaz
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Cost Efficiency ◽  
Building Energy ◽  
Energy Performance ◽  
Insulation Material ◽  
Negative Effects ◽  
Energy Needs ◽  
Global Cost ◽  
Optimum Solution

In Turkey, according to TUİK Sectoral Energy Consumption Statistics (2006), the hotel buildings with the highest share, constitute 35% of the total building energy consumption. Energy needs and consumption behaviours differ according to the typology of the building. Energy Performance of Buildings Directive (EPBD) has been adapted to the conditions of Turkey to increase energy and cost efficiency, to reduce the environmental and economic negative effects. The energy consumption and the global cost were investigated under different conditions in an existing hotel building. The paper is unique in its ability to deliver optimum solution through comparison by evaluating energy and cost efficiency at the same time considering sectoral, climatic, technological and economic national conditions when the literature research detailed in the present works about the problem is evaluated in detail. All findings have been compared simultaneously under different climate regions of seasonal and yearly working conditions of selected test hotel to obtain the energy and cost efficiency. Among the proposed improvement scenarios, the optimum scenario is determined in terms of cost and energy efficiency in S18 which has the highest energy efficiency. In this case, both insulation material type and thickness as well as glass type can be bent and through multiple measures can be achieved by 25.7% improvement for energy efficiency.

Low Energy Building Designs for Extreme Weather Conditions in Central Asia

2012 ◽  
Author(s):  
Serik Tokbolat ◽  
Raikhan Tokpatayeva ◽  
Sarim Naji Al-Zubaidy
Keyword(s):  
Carbon Emissions ◽  
Weather Conditions ◽  
Building Design ◽  
Extreme Weather ◽  
Low Energy ◽  
Design Strategies ◽  
Increase Energy Efficiency ◽  
Energy Technologies ◽  
End Use ◽  
Building Designs

Buildings account for nearly 40% of the end-use energy consumption and carbon emissions globally. These buildings, once built, are bound to be utilized for several decades if not longer. The building sector therefore holds a significant responsibility for implementing strategies to increase energy efficiency and reduce carbon emissions and thus contribute to global efforts directed toward mitigating the adverse effects of climate change. This paper presents an oversight of effective low-energy building design strategies for the extreme weather conditions in Kazakhstan (Astana), with temperature ranging between −35 and +40 C. Passive design features coupled with integration of renewable energy technologies have been identified for the next generation of buildings in Astana. The specific nature of the work is intentional, it is a continuing attempt to generate relevant know how that has direct relevancy to Astana’s system approach to energy conversation to meet its extreme winters.

Energy Efficiency and Insulation Thickness According to the Compactness Index Case of a Studio Apartment Under Saharan Weather Conditions

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
S. Bendara ◽  
S. M. A. Bekkouche ◽  
T. Benouaz ◽  
S. Belaid ◽  
M. Hamdani ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Weather Conditions ◽  
Return Time ◽  
Structure Type ◽  
Cold Season ◽  
Energy Needs ◽  
Insulation Thickness ◽  
Type C ◽  
The Comparative Study ◽  
The Impact

Financial energetic problems oblige citizens to reduce the energy consumption. Accordingly, the recent research showed that major financial economies can be optimally achieved, by introducing some passive measures. The main objective of the current contribution is to investigate the impact of thermal insulation and compactness on energy efficiency. Following the assessment of the methodology, several input parameters were identified and economic insulation thicknesses were obtained. Finding revealed that the best effectiveness of solar gain has been observed for a better insulation and a good compactness, whereas a reduction of about 12.51% of energy needs can be achieved. Similar to the previous case, compactness has an attractive effect, provided that the building was well insulated. Furthermore, any variance cannot be occurred in economic insulation thickness by varying the building compactness. Unlike this remark, for a better compactness, a slight increase in the investment-return time has been noticed, following the energy bill reduction, which becomes more interesting. Hence, the comparative study averred that the previous passive concepts provide reduction in energy needs nearest 73.64%. Thus, reduction was nexus 82.17%, during cold season, and around 59.87%, in overheating period. As consequence, the studied structure type can be integrated in the buildings that have an energy label of “type C.”

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