Optimizing the production scheduling of a single machine to minimize total energy consumption costs

The success of an industry today depends on its ability to innovate. In terms of energy performance, this innovation is reflected in the ability of manufacturers to implement new solutions or technologies that enable better energy management. In this regard, this paper aims to address this gap by incorporating energy consumption as an explicit criterion in flowshop scheduling of jobs and flexible preventive maintenance. Leveraging the variable speed of machining operations leading to different energy consumption levels, we explore the potential for energy saving in manufacturing. We develop a mixed integer linear multiobjective optimization model for minimizing the makespan and the total energy consumption. In the literature, no papers considering both production scheduling and flexible periods of maintenance with minimizing both objective the total of energy consumption in flowshop and makespan. The performance of the proposed mixed binary integer programming model is evaluated based on the exact method of branch and bound algorithm. A study of the results proved the performance of the model developed.

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Single-machine scheduling problem with total energy consumption costs minimization

IFAC-PapersOnLine ◽

10.1016/j.ifacol.2019.11.087 ◽

2019 ◽

Vol 52 (13) ◽

pp. 409-414

Author(s):

Mohammad Mohsen Aghelinejad ◽

Yassine Ouazene ◽

Alice Yalaoui

Keyword(s):

Energy Consumption ◽

Total Energy ◽

Single Machine ◽

Machine Scheduling ◽

Single Machine Scheduling ◽

Scheduling Problem ◽

Total Energy Consumption

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Energy savings potential of new aeration system: Full scale trials

Water Practice & Technology ◽

10.2166/wpt.2012.098 ◽

2012 ◽

Vol 7 (4) ◽

Author(s):

A. Lazić ◽

V. Larsson ◽

Å. Nordenborg

Keyword(s):

Control System ◽

Energy Consumption ◽

Total Energy ◽

Energy Savings ◽

Treatment Plant ◽

Full Scale ◽

Total Energy Consumption ◽

Aeration System ◽

Fine Bubble ◽

Aeration Control

The objective of this work is to decrease energy consumption of the aeration system at a mid-size conventional wastewater treatment plant in the south of Sweden where aeration consumes 44% of the total energy consumption of the plant. By designing an energy optimised aeration system (with aeration grids, blowers, controlling valves) and then operating it with a new aeration control system (dissolved oxygen cascade control and most open valve logic) one can save energy. The concept has been tested in full scale by comparing two treatment lines: a reference line (consisting of old fine bubble tube diffusers, old lobe blowers, simple DO control) with a test line (consisting of new Sanitaire Silver Series Low Pressure fine bubble diffusers, a new screw blower and the Flygt aeration control system). Energy savings with the new aeration system measured as Aeration Efficiency was 65%. Furthermore, 13% of the total energy consumption of the whole plant, or 21 000 €/year, could be saved when the tested line was operated with the new aeration system.

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