Towards Energy Sustainability in Federated and Interoperable Clouds

2013 ◽  
pp. 329-350 ◽  
Author(s):  
Antonio Celesti ◽  
Antonio Puliafito ◽  
Francesco Tusa ◽  
Massimo Villari
Keyword(s):  
Renewable Energy ◽  
Energy Management ◽  
Specific Energy ◽  
Management Strategies ◽  
Energy Sustainability ◽  
Sustainable Environment ◽  
Cloud Federation ◽  
Cloud Providers ◽  
New Business ◽  
Sustainability Policy

Cloud federation is paving the way toward new business scenarios in which it is possible to enforce more flexible energy management strategies than in the past. Considering independent cloud providers, each one is exclusively bound to the specific energy supplier powering its datacenter. The situation radically changes if we consider a federation of cloud providers powered by both a conventional energy supplier and a renewable energy generator. In such a context, the opportune relocation of computational workload among providers can lead to a global energy sustainability policy for the whole federation. In this work, the authors investigate the advantages and issues for the achievement of such a sustainable environment.

Towards Energy Sustainability in Federated and Interoperable Clouds

2013 ◽  
pp. 279-301 ◽  
Author(s):  
Antonio Celesti ◽  
Antonio Puliafito ◽  
Francesco Tusa ◽  
Massimo Villari
Keyword(s):  
Renewable Energy ◽  
Energy Management ◽  
Specific Energy ◽  
Management Strategies ◽  
Energy Sustainability ◽  
Sustainable Environment ◽  
Cloud Federation ◽  
Cloud Providers ◽  
New Business ◽  
Sustainability Policy

Cloud federation is paving the way toward new business scenarios in which it is possible to enforce more flexible energy management strategies than in the past. Considering independent cloud providers, each one is exclusively bound to the specific energy supplier powering its datacenter. The situation radically changes if we consider a federation of cloud providers powered by both a conventional energy supplier and a renewable energy generator. In such a context, the opportune relocation of computational workload among providers can lead to a global energy sustainability policy for the whole federation. In this work, the authors investigate the advantages and issues for the achievement of such a sustainable environment.

scholarly journals Sex-specific energy management strategies in response to training for increased foraging effort prior to reproduction

2021 ◽  
pp. jeb.235846
Author(s):  
Kang Nian Yap ◽  
Donald R. Powers ◽  
Melissa L. Vermette ◽  
Olivia Hsin-I Tsai ◽  
Tony D. Williams
Keyword(s):  
Energy Expenditure ◽  
Energy Management ◽  
Specific Energy ◽  
Management Strategies ◽  
Common Garden ◽  
Free Living ◽  
Foraging Effort ◽  
Specific Manner ◽  
Daily Energy ◽  
Males And Females

Free-living animals often engage in behaviour that involve high rates of workload and result in high daily energy expenditure (DEE), such as reproduction. However, the evidence for elevated DEE accompanying reproduction remain equivocal. In fact, many studies have found no difference in DEE between reproducing vs. non-reproducing females. One of the hypotheses explaining the lack of difference is the concept of energetic ceiling. However, it is unclear whether the lack of increases in energy expenditure is due to the existence of an energetic ceiling and/or compensation by males during parental care. To investigate whether an energetic ceiling exists we experimentally manipulated foraging effort in captive zebra finches, Taeniopygia guttata, creating two groups with high- and low foraging effort followed by both groups breeding in a low foraging effort common garden condition. DEE was measured in both sexes throughout the experiment. Our findings showed sex-specific energy management strategies in response to training for increased foraging effort prior to reproduction. Specifically, males and females responded differently to high foraging effort treatment and subsequently to chick rearing in terms of energy expenditure. Our results also suggested that there appears to be an energetic ceiling in females and that energetic costs incurred prior to reproduction can be carried over into subsequent stages of reproduction in a sex-specific manner.

scholarly journals Hydrogen vs. Battery in the Long-term Operation. A Comparative Between Energy Management Strategies for Hybrid Renewable Microgrids

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 698 ◽  
Author(s):  
Andrea Monforti Ferrario ◽  
Francisco Vivas ◽  
Francisca Segura Manzano ◽  
José Andújar ◽  
Enrico Bocci ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Management ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Management Strategies ◽  
High Mass ◽  
Management Systems ◽  
Cumulative Energy ◽  
Term Operation

The growth of the world’s energy demand over recent decades in relation to energy intensity and demography is clear. At the same time, the use of renewable energy sources is pursued to address decarbonization targets, but the stochasticity of renewable energy systems produces an increasing need for management systems to supply such energy volume while guaranteeing, at the same time, the security and reliability of the microgrids. Locally distributed energy storage systems (ESS) may provide the capacity to temporarily decouple production and demand. In this sense, the most implemented ESS in local energy districts are small–medium-scale electrochemical batteries. However, hydrogen systems are viable for storing larger energy quantities thanks to its intrinsic high mass-energy density. To match generation, demand and storage, energy management systems (EMSs) become crucial. This paper compares two strategies for an energy management system based on hydrogen-priority vs. battery-priority for the operation of a hybrid renewable microgrid. The overall performance of the two mentioned strategies is compared in the long-term operation via a set of evaluation parameters defined by the unmet load, storage efficiency, operating hours and cumulative energy. The results show that the hydrogen-priority strategy allows the microgrid to be led towards island operation because it saves a higher amount of energy, while the battery-priority strategy reduces the energy efficiency in the storage round trip. The main contribution of this work lies in the demonstration that conventional EMS for microgrids’ operation based on battery-priority strategy should turn into hydrogen-priority to keep the reliability and independence of the microgrid in the long-term operation.

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