scholarly journals Real Time Minimum Energy Tracking Techniquies for Digital Load Circuit

2019 ◽  
Vol 8 (3) ◽  
pp. 5897-5900
Keyword(s):  
Energy Consumption ◽  
Minimum Energy ◽  
Estimation Methods ◽  
System Software ◽  
Efficient Design ◽  
Tablet Pcs ◽  
Minimum Energy Consumption ◽  
Different Levels ◽  
Load Circuit

Minimization of energy consumption is an important constraint in portable electronic devices such as smart phones or tablet PCs, laptops . With reliable energy measurement and estimation methods and tools, it is possible to accurate prediction of minimum energy consumption at different levels i.e., from circuit to architecture, architecture to system software and system software to application. Energy efficient design requires reducing energy dissipation in all stages of the design process without compromising the system performance and the quality of services..

scholarly journals Optimization of the CO2 Liquefaction Process-Performance Study with Varying Ambient Temperature

2019 ◽  
Vol 9 (20) ◽  
pp. 4467 ◽  
Author(s):  
Steven Jackson ◽  
Eivind Brodal
Keyword(s):  
Energy Consumption ◽  
Ambient Temperature ◽  
Minimum Energy ◽  
Attractive Alternative ◽  
System Modelling ◽  
Efficient Design ◽  
Performance Study ◽  
Cooling Temperature ◽  
Minimum Energy Consumption ◽  
Liquefaction Process

In carbon capture utilization and storage (CCUS) projects, the transportation of CO2 by ship can be an attractive alternative to transportation using a pipeline, particularly when the distance between the source and usage or storage location is large. However, a challenge associated with this approach is that the energy consumption of the liquefaction process can be significant, which makes the selection of an energy-efficient design an important factor in the minimization of operating costs. Since the liquefaction process operates at low temperature, its energy consumption varies with ambient temperature, which influences the trade-off point between different liquefaction process designs. A consistent set of data showing the relationship between energy consumption and cooling temperature is therefore useful in the CCUS system modelling. This study addresses this issue by modelling the performance of a variety of CO2 liquefaction processes across a range of ambient temperatures applying a methodical approach for the optimization of process operating parameters. The findings comprise a set of data for the minimum energy consumption cases. The main conclusions of this study are that an open-cycle CO2 process will offer lowest energy consumption below 20 °C cooling temperature and that over the cooling temperature range 15 to 50 °C, the minimum energy consumption for all liquefaction process rises by around 40%.

scholarly journals Stability of Heat and Energy Characteristics of Refrigerating Units as a Condition of Quality Increase of Agricultural Production Storage

2021 ◽  
Author(s):  
Sergey E. Bashniak ◽  
Evgeniy A. Ladygin ◽  
Olga S. Anisimova ◽  
Valentina Yu. Kontareva ◽  
Natalya G. Papchenko ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Agricultural Production ◽  
Minimum Energy ◽  
Specific Energy Consumption ◽  
Temperature Stability ◽  
Technical Condition ◽  
Storage Quality ◽  
Minimum Energy Consumption ◽  
Energy Indicators

This article provides information about the importance of stable thermal operating modes of refrigeration machines in the condition of changes in the thermal load on the compressor. We also consider the problem of the minimum energy consumption of refrigeration machines. These two parameters characterize the storage quality of agricultural products in refrigeration machines. It is shown that the temperature stability of the cooling chambers and the minimum energy consumption of the cooling process determine the refrigerator efficiency and, ultimately, the production cost. The article proposes continuous monitoring of the heat and energy indicators of refrigerators. These indicators are recorded and after the set period of operation, control and verification measurements of the control refrigeration machine’s heat and energy indicators are performed. The convergence or divergence of these indicators is used to evaluate the stability of the cooling chambers’ temperature regimes and the specific energy consumption. We also consider the influence of time on the performance of the compression refrigeration machine changes and methods of current technical condition diagnostics. If the deviations are insignificant, the program goes through the cycle to the beginning of monitoring and after a set period of time again automatically performs control measurements and evaluation of deviations. In the case of significant deviations, the decision-making subroutine is activated: either to operate the refrigerator further; perform its maintenance; suspend its operation; or replace it. Keywords: refrigeration units, cooling, heat and power characteristics, management controller, storage quality of agricultural production

scholarly journals Theoretical substantiation of constructive parameters of the working body of the chain top-crusher

2019 ◽  
pp. 84-88
Author(s):  
Vladimir Vladimirovich Melem ◽  
Nikolay Vasilievich Stepanov ◽  
Vyacheslav Vladimirovich Bonnet
Keyword(s):  
Energy Consumption ◽  
Minimum Energy ◽  
Mechanical Parameters ◽  
Theoretical Substantiation ◽  
Minimum Energy Consumption ◽  
Transverse Profile ◽  
Improved Performance ◽  
The Moment ◽  
Working Bodies

The top-crusher with more advanced design and improved performance characteristics has been proposed. The dependence between geometric and mechanical parameters of the rotor is established, providing maximum absolute speed of knife blades for the moment of cutting the stem which creates the best conditions for grinding the stems. It follows from the results of calculations that the proposed chain top-crusher, in comparison to the existing analogues, has: minimum energy consumption (Nprv=13-15 kWt), and, consequently, the lower fuel consumption (in comparison to KIR-1.5 Nprv KIR=18-20 kWt), improved quality of making technological process – by copying the transverse profile of the ridges and the increased reliability of working bodies.

scholarly journals Optimization of Energy-Efficient Speed Profile for Electrified Vehicles

2018 ◽  
Author(s):  
Hadi Abbas ◽  
Youngki Kim ◽  
Jason B. Siegel ◽  
Denise M. Rizzo
Keyword(s):  
Energy Consumption ◽  
Energy Efficient ◽  
Minimum Energy ◽  
Efficient Operation ◽  
Operating Modes ◽  
Minimum Energy Consumption ◽  
System A ◽  
Trip Time ◽  
Route Information

This paper presents a study of energy-efficient operation of vehicles with electrified powertrains leveraging route information, such as road grades, to adjust the speed trajectory. First, Pontryagin’s Maximum Principle (PMP) is applied to derive necessary conditions and to determine the possible operating modes. The analysis shows that only 5 modes are required to achieve minimum energy consumption; full propulsion, cruising, coasting, full regeneration, and full regeneration with conventional braking. The minimum energy consumption problem is reformulated and solved in the distance domain using Dynamic Programming to optimize speed profiles. A case study is shown for a light weight military robot including road grades. For this system, a tradeoff between energy consumption and trip time was found. The optimal cycle uses 20% less energy for the same trip duration, or could reduce the travel time by 14% with the same energy consumption compared to the baseline operation.

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