Exploring Trade-Offs between Energy Savings and Reliability in Storage Systems

2018 ◽  
pp. 168-201
Author(s):  
Ali R. Butt
Keyword(s):  
Energy Savings ◽  
Storage Systems ◽  
Trade Offs

scholarly journals Synergies and Trade-Offs Between Sustainable Development and Energy Performance of Exterior Lighting

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2245 ◽  
Author(s):  
Annika K. Jägerbrand
Keyword(s):  
Decision Making ◽  
Energy Efficiency ◽  
Sustainable Development ◽  
Energy Savings ◽  
Global Climate ◽  
Ecological Impact ◽  
Energy Performance ◽  
Positive Interactions ◽  
Systematic Analysis ◽  
Trade Offs

The aim of this review was to map synergies and trade-offs between sustainable development and energy efficiency and savings regarding exterior lighting. Exterior lighting, such as public road and street lighting, requires significant amounts of energy and hinders sustainable development through its increasing of light pollution, ecological impact, and global climate change. Interlinkages between indicators in sustainability and energy that have positive interactions will lead to a mutual reinforcement in the decision-making process, and vice versa, interlinkages between trade-offs may lead to unwanted and conflicting effects. Very few studies have presented a clear vision of how exterior lighting should be contributing to, and not counteracting, the sustainable development of our planet. This study was conducted through a theoretical and systematic analysis that examined the interactions between sustainable development and energy performance based on a framework using indicators and variables, and by reviewing the current literature. Additionally, 17 indicators of energy efficiency and energy savings were identified and used in the analysis. Most interactions between variables for sustainable development and energy performance (52%) were found to be synergistic. The synergistic interactions were mostly found (71%) in the ecological and environmental dimension showing that environmental and ecological sustainability goes hand in hand with energy efficiency and savings. Trade-offs were found only in the economic and social dimensions accounting for 18% of the interactions identified. This review shows that the interactions between sustainable development and energy performance can be used to establish more efficient policies for decision-making processes regarding exterior lighting.

scholarly journals Marketing Energy Conservation to Homeowners: An Action Program from Public Policy Research

1984 ◽  
Vol 3 (1) ◽  
pp. 149-166 ◽  
Author(s):  
William Rudelius ◽  
Richard Weijo ◽  
Gary Dodge
Keyword(s):  
Energy Conservation ◽  
Energy Savings ◽  
Policy Research ◽  
Cost Effective ◽  
Marketing Strategies ◽  
Public Expenditures ◽  
Fixed Amount ◽  
Public Policy Research ◽  
Trade Offs ◽  
The Individual

Energy conservation appeals to homeowners stressing patriotism and social responsibility have not worked. The authors believe that more precise information for the homeowner showing the specific dollar costs and savings for various energy actions will stimulate meaningful, beneficial trade-offs for the individual. They further believe that broadly conceived, publicly sponsored marketing strategies can help individual consumers make more informed energy-conservation choices from among the continuous, seasonal, and one-time actions available to them. If public policymakers focus efforts on the most cost-effective, energy-saving actions for households, the community will receive the greatest energy savings for a fixed amount of public expenditures.

ThriftStore: Finessing Reliability Trade-Offs in Replicated Storage Systems

2011 ◽  
Vol 22 (6) ◽  
pp. 910-923 ◽  
Author(s):  
A Gharaibeh ◽  
S Al-Kiswany ◽  
M Ripeanu
Keyword(s):  
Storage Systems ◽  
Trade Offs

Supercapacitors On-Board Light Rail Vehicles: Enhanced Energy Storage Systems for Improved Vehicle Efficiency

2008 ◽  
Author(s):  
Joeri Van Mierlo ◽  
Ricardo Barrero ◽  
Xavier Tackoen
Keyword(s):  
Energy Storage ◽  
Power Flow ◽  
Energy Savings ◽  
Storage Systems ◽  
Energy Content ◽  
Light Rail ◽  
Energy Storage Systems ◽  
Rail Vehicles ◽  
Vehicle Load ◽  
Voltage Variation

This article will propose different energy storage systems, ranging from 0.91 kWh to 1.56 kWh, suitable for a 30 m long tram. To configure the system regarding energy content, voltage variation, maximum current and power losses, a model of the tram, network and substations power flow has been developed in a Matlab/Simulink environment. Results obtained in energy savings at substation level vary from 24% to 27, 6% under the same driving profile and auxiliaries load; while at the end-of-life of supercapacitors, the range varies from 18, 1% to 25, 1% depending on the supercapacitor module used and vehicle load.

scholarly journals Beyond Operational Energy Efficiency: A Balanced Sustainability Index from a Life Cycle Consideration

2021 ◽  
Vol 13 (20) ◽  
pp. 11263
Author(s):  
Ming Hu
Keyword(s):  
Life Cycle ◽  
Energy Savings ◽  
Operating Cost ◽  
Embodied Energy ◽  
Emissions Reduction ◽  
Sustainability Index ◽  
Trade Offs ◽  
Life Cycle Perspective ◽  
Operational Energy ◽  
Whole Life Cycle

Most deep energy renovation projects focus only on an operating energy reduction and disregard the added embodied energy derived from adding insulation, window/door replacement, and mechanical system replacement or upgrades. It is important to study and address the balance and trade-offs between reduced operating energy and added embodied energy from a whole life cycle perspective to reduce the overall building carbon footprint. However, the added embodied energy and related environmental impact have not been studied extensively. In response to this need, this paper proposes a holistic sustainability index that balances the trade-off between reduced operating energy and added embodied energy. Eight case projects are used to validate the proposed method and calculation. The findings demonstrate that using a balanced sustainability index can reveal results different from a conventional operating energy-centric approach: (a) operating energy savings can be offset by the embodied energy gain, (b) the operating energy savings do not always result in a life cycle emissions reduction, and (c) the sustainability index can vary depending on the priorities the decision makers give to operating carbon, embodied carbon, and operating cost. Overall, the proposed sustainability score can provide us with a more comprehensive understanding of how sustainable the renovation works are from a life cycle carbon emissions perspective, providing a more robust estimation of global warming potential related to building renovation.

scholarly journals Autonomous Cooperative Control for Hybrid AC/DC Microgrids Considering Multi-Energy Complementarity

2021 ◽  
Vol 9 ◽  
Author(s):  
Dan Zhou ◽  
Shangren Chen ◽  
Hanyun Wang ◽  
Minyuan Guan ◽  
Lihua Zhou ◽  
...  
Keyword(s):  
Energy Storage ◽  
Cooperative Control ◽  
Energy Savings ◽  
Storage Systems ◽  
Storage Period ◽  
Ice Storage ◽  
Energy Storage Systems ◽  
Dc Microgrids ◽  
Electrical Loads ◽  
Reliable Power Supply

Multi-energy hybrid AC/DC microgrids (MGs), considering ice storage systems (ISSs), can promote the flexible integration and efficient utilization of distributed generators (DGs) and energy storage systems (ESSs), provide a reliable power supply for local loads, and achieve multi-energy complementarity and energy savings at the same time. An autonomous cooperative control of multi-energy MGs is proposed in this paper, which can realize the following targets: 1) In the energy storage period, ice storage systems and energy storage systems can absorb energy in accordance with their rated capacity. 2) In the energy releasing period, ice storage systems are first put into operation, and the rest of the equivalent cooling loads and electrical loads are shared by the energy storage systems according to their rated capacity ratio. Besides, the complete system small signal model is constructed, which can be used to analyze the features and characteristics of the system and guide the optimal design of the control parameters. Finally, the effectiveness of the proposed control is corroborated by several case studies conducted in PSCAD/EMTDC.

scholarly journals A heterothermic spectrum in hummingbirds

2022 ◽  
Author(s):  
Anusha Shankar ◽  
Isabelle N. H. Cisneros ◽  
Sarah Thompson ◽  
Catherine H. Graham ◽  
Donald R. Powers
Keyword(s):  
Energy Savings ◽  
Genetic Regulation ◽  
Bird Species ◽  
Ground Squirrels ◽  
Fine Scale ◽  
Body Temperatures ◽  
Trade Offs ◽  
Natural Temperature ◽  
Balance Energy ◽  
Arctic Ground Squirrels

Many endotherms use torpor, saving energy by a controlled reduction of their body temperature and metabolic rate. Some species (e.g., arctic ground squirrels, hummingbirds) enter deep torpor, dropping their body temperatures by 23-37°C, while others can only enter shallow torpor (e.g., pigeons, 3-10°C reductions). However, deep torpor in mammals can increase predation risk (unless animals are in burrows or caves), inhibit immune function, and result in sleep deprivation, so even for species that can enter deep torpor, facultative shallow torpor might help balance energy savings with these potential costs. Deep torpor occurs in three avian orders, but the trade-offs of deep torpor in birds are unknown. Although the literature hints that some bird species (mousebirds and perhaps hummingbirds) can use both shallow and deep torpor, little empirical evidence of such an avian heterothermy spectrum within species exists. We infrared imaged three hummingbird species that are known to use deep torpor, under natural temperature and light cycles, to test if they were also capable of shallow torpor. All three species used both deep and shallow torpor, often on the same night. Depending on the species, they used shallow torpor for 5-35% of the night. The presence of a heterothermic spectrum in these bird species indicates a capacity for fine-scale physiological and genetic regulation of avian torpid metabolism.

scholarly journals A Water-Energy-Food Nexus Approach for Conducting Trade-off Analysis: Morocco’s Phosphate Industry in the Khouribga Region

2020 ◽  
Author(s):  
Sang-Hyun Lee ◽  
Amjad T Assi ◽  
Bassel T. Daher ◽  
Fatima E. Mengoub ◽  
Rabi H. Mohtar
Keyword(s):  
Supply Chain ◽  
Energy Savings ◽  
Mining Area ◽  
Management Decision ◽  
Irrigation Season ◽  
Dynamic Management ◽  
Trade Off ◽  
Phosphate Industry ◽  
Trade Offs ◽  
The Impact

Abstract. The aim of the study is to apply the Nexus approach for conducting trade-off analysis between industrial and agricultural area, thus we developed Water-Energy-Food Nexus-Phosphate (WEF-P) Tool based on integrating the supply chain processes, transportation, and water-energy footprints. This study evaluated the impact of phosphate industry on regional water, energy, and food in Khouribga, the representative phosphate mining area of Morocco using the developed WEF-P Tool. To address the potential impacts on the water supply in agricultural areas, the field data of processes (from mining to transportation) were collected and applied to possible supply chain scenarios according to type of product (phosphate rock, slurry). Analysis of positive impacts of dynamic management suggest seasonal management of phosphate production to allow less phosphate production during the irrigation season (increasing available water for agriculture) and greater phosphate production during wetter seasons (when water demand for agricultural production is less). Additionally, the transport of raw phosphate as slurry through a pipeline increases the total water required to 34.6 million m3. This is a 76 % increase over the business as usual scenario (BAU)). The shift to slurry also produces an energy savings of nearly 80 % over BAU, which requires 204.0 million litre of fossil fuel, as compared to only 40.5 million litre needed for slurry transport. During May to July, the dry or water scarce season when irrigation is needed, total ground water use decreased from 5.8 to 5.2 million m3. Dynamic management of the phosphate industry can also save 143 MWh of electricity annually, accompanied with a reduction of 117 tons of CO2 emissions. In a changing climate, making water available at the right time and place requires analysis of complex scientific, technical, socio-economical, regulatory, and political issues. The WEF-P Tool can be used to assess user-created scenarios, offering a management-decision aid to effectively ensure more sustainable management of limited resources and increased reliability of water resources for both agricultural and industrial use. This study on the application of WEF Nexus to the Phosphate industry can be a roadmap for other industrial application where trade-offs between the primary resources exist.

scholarly journals Performance and Energy Trade-Offs for Parallel Applications on Heterogeneous Multi-Processing Systems

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2409
Author(s):  
A. M. Coutinho Demetrios ◽  
Daniele De Sensi ◽  
Arthur Francisco Lorenzon ◽  
Kyriakos Georgiou ◽  
Jose Nunez-Yanez ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Configuration Space ◽  
Energy Savings ◽  
Analytical Models ◽  
Parallel Applications ◽  
Pareto Optimal ◽  
Trade Offs ◽  
Energy Trade ◽  
Optimal Configurations ◽  
Selection Of

This work proposes a methodology to find performance and energy trade-offs for parallel applications running on Heterogeneous Multi-Processing systems with a single instruction-set architecture. These offer flexibility in the form of different core types and voltage and frequency pairings, defining a vast design space to explore. Therefore, for a given application, choosing a configuration that optimizes the performance and energy consumption is not straightforward. Our method proposes novel analytical models for performance and power consumption whose parameters can be fitted using only a few strategically sampled offline measurements. These models are then used to estimate an application’s performance and energy consumption for the whole configuration space. In turn, these offline predictions define the choice of estimated Pareto-optimal configurations of the model, which are used to inform the selection of the configuration that the application should be executed on. The methodology was validated on an ODROID-XU3 board for eight programs from the PARSEC Benchmark, Phoronix Test Suite and Rodinia applications. The generated Pareto-optimal configuration space represented a 99% reduction of the universe of all available configurations. Energy savings of up to 59.77%, 61.38% and 17.7% were observed when compared to the performance, ondemand and powersave Linux governors, respectively, with higher or similar performance.

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