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Journal of Green Engineering

Editor-in-Chief: Michele Albano, ISEP - Instituto Superior de Engenharia do Porto, Portugal

ISSN: 1904-4720 (Print Version),

ISSN: 2245-4586 (Online Version)
Vol: 4   Issue: 1

Published In:   October 2013

Publication Frequency: Quarterly

Search Available Volume and Issue for Journal of Green Engineering

Journal Description        Read Full Articles        Editorial Board        Subscription        Indexed

Energy-Efficient Traffic Engineeringfor Future Networking Infrastructures

doi: 10.13052/jge1904-4720.411
George Athanasiou

KTH Royal Institute of Technology, 100–44, Stockholm, Sweden

Abstract: [+]    |    Download File [ 565KB ]   |    Read Article Online

Abstract: A general problem formulation for energy-efficient traffic engineering forfuture core networks is presented. Moreover, a distributed heuristic algorithmthat provides jointly load balancing and energy efficiency is proposed.Simulation results show that the proposed algorithm approaches the optimalnetwork operation, in terms of throughput and energy consumption.

Keywords: Network Management, Traffic Engineering, Load Balancing,Energy-awareness.

Electricity Generation and Biofilm Formation in Microbial Fuel Cells Using Plate Anodes Constructed from Various Grades of Graphite

doi: 10.13052/jge1904-4720.412
Wudneh Ayele Shewa1, Subba Rao Chaganti2 and Jerald A. Lalman1

1Department of Civil and Environmental Engineering, University of Windsor, Center for Engineering Innovation, 401 Sunset Ave., Windsor, ON, Canada, N9B 3P4
2Great Lakes Institute for Environmental Research, University of Windsor, 401 Sunset Ave., Windsor, ON, Canada N9B 3P4

Abstract: [+]    |    Download File [ 2034KB ]   |    Read Article Online

Abstract: Construction materials as well as the electrode configuration are major factors affecting electricity generation in microbial fuel cells (MFCs). Three graphite plate electrodes (HK06, G347 and POCO3) with different characteristics (specific resistance, grain size and specific gravity) were used to evaluate electricity generation and biofilm formation in MFCs. The electrodes were assessed by operating duplicate MFCs under the same conditions. Electrochemical impedance spectroscopy, cyclic voltammetry and linear sweep voltammetry were used to evaluate the performance of the electrodes. The data indicated the grade of electrode played a critical role in the MFCs performance. Higher power density was observed for the graphite electrode designated as POCO3. The trend for increasing electricity generation was as follows: POCO3 > G347 > HK06. Distinct microbial populations were detected in the biofilm community when comparing the different electrodes. Selecting electrodes for optimum electricity generation is important in the development of laboratory scale and full-scale MFCs.

Keywords: Microbial fuel cell, Graphite plate electrode, Energy efficiency, biofilm, Performance comparison.

A NovelWave Energy Converter Using the Stewart Platform

doi: 10.13052/jge1904-4720.413
B. Lotfi1,2, L. Huang2

1Department of Engineering, Islamic Azad University, Mashhad Branch Mashhad, Iran
2School of Engineering, Auckland University of Technology, Auckland, New Zealand

Abstract: [+]    |    Download File [ 1578KB ]   |    Read Article Online

Abstract: Ocean wave is one of the biggest sources of renewable energy that is economically attractive. However, technology of harvesting wave power is relatively undeveloped compared to other renewable energy technologies. Finding optimal structures of wave energy converter (WEC) is still an open research problem. The idea of using Stewart platform as a WEC is for the first time proposed in this paper. Its key module is a Stewart platform, which is a parallel mechanism with six degrees of freedom, used to convert the motion induced by waves to the prismatic motions of multiple hydraulic/ pneumatic cylinders. The proposed new type WEC can be used in the offshore wave power generation systems and put in any place where there exist roaring waves. The mathematical model has been set up and the numerical simulation has been performed to verify the effectiveness of the proposed converter. The simulation results show that more energy can be generated by this new type of converter than other existing WECs.

Keywords: Wave Energy, Converter, Parallel Mechanism.

Comparison of Fully Pneumatic and Pneumatic - Electric Hybrid Configurations for Propulsion of A Refrigerated Vehicle

doi: 10.13052/jge1904-4720.414
Midhun V.S1, A Ramesh2 and Sathyanandan M1

1M/S Nissan Ashokleyland Technologies Limited, No 19, Venkatanarayanan Road, T Nagar, Chennai, India
2 I C Engines Laboratory, Mechanical Engineering Department, IIT Madras, Chennai, India

Abstract: [+]    |    Download File [ 1615KB ]   |    Read Article Online

Abstract: Two different configurations of using a multistage air powered engine with variable valve timing for powering a light transport vehicle were evaluated through thermodynamic simulation. The expanded cold air between the stages was used to refrigerate the cold space and thereby get reheated. However this cannot meet the refrigeration load completely. Thus in the first configuration the air engine provided the shaft power for propulsion and for additional refrigeration. In the second configuration the air engine was connected in parallel to a motor/generator and Li-ion battery. The total refrigeration load was met by the expanded cold air between stages. The additional shaft power available was used to charge the battery. After depletion of the compressed air, the battery was used to provide shaft power and refrigeration. The range of the hybrid configuration was evaluated to be slightly higher.

Keywords: Multistage expansion, variable valve timing, refrigeration, hybrid layout.

Green and FairWorkload Distribution in Geographically Distributed Datacenters

doi: 10.13052/jge1904-4720.415
Rawan Y. Alawnah, Imtiaz Ahmad and Ebrahim A. Alrashid

Computer Engineering Department, College of Computing Sciences and Engineering, Kuwait University, Kuwait,

Abstract: [+]    |    Download File [ 1062KB ]   |    Read Article Online

Abstract: To accommodate user applications and requests, service providers host large computer systems over an infrastructure of distributed datacenters in different geographical locations. Consequently, energy and power consumption increases, increasing electrical and cooling costs. Hence more attention is paid to green computing and exploiting renewable energy sources, along with decreasing electrical costs so that these datacenters are operated efficiently and effectively, with less impact on the environment. In this paper, a socially responsible scheduling scheme that distributes load from several regions to geographically distributed datacenters will be extended. Optimal electricity, social and latency costs will be sought within service level agreements, ensuring fairness between different regions and highlighting its importance. Adopting standard gradient methods and Lagrange multipliers, an optimization algorithm called Green-Fair is proposed that provides optimal selection of datacenters. Experimental results show the effectiveness of the Green-Fair algorithm in utilizing green energy sources, reducing the number of SLA violations significantly, reducing latency costs and preserving fairness requirements by the SLAs while having little effect on the service providers’ overall operational costs.

Keywords: Datacenter,green computing, cloud computing,SLA, fairness, optimization, Lagrange.

River Publishers: Journal of Green Engineering