The Relevance of the Rotational Speed of Roadheader Cutting Heads According to the Energy Consumption of the Cutting Process / Znaczenie prędkości obrotowej głowic urabiających kombajnu chodnikowego ze względu na energochłonność procesu urabiania

2013 ◽  
Vol 58 (1) ◽  
pp. 3-21 ◽  
Author(s):  
Marian Dolipski ◽  
Piotr Cheluszka ◽  
Piotr Sobota
Keyword(s):  
Energy Consumption ◽  
Rotational Speed ◽  
Load Condition ◽  
Cutting Process ◽  
Wide Range ◽  
Conical Picks ◽  
Excessive Load ◽  
The Impact ◽  
Speed Adjustment ◽  
Cutting System

The article presents the outcomes of extensive computer investigations the purpose of which was to identify the impact of cutting heads’ rotational speed on the load applied on the cutting heads drive as well as on the efficiency and energy consumption of the cutting process. The investigations were performed based on a simulation of the rock cutting process within a wide range of rocks’ compressive strength with a roadheader transverse head equipped with 80 conical picks. Variations were taken into consideration in the rotational speed of the cutting heads and variations in the factors connected with the properties of the drives driving the cutting heads on the load condition of the cutting system and on the energy consumption of the cutting process. The computer simulations carried out indicate that a reduction is possible in the energy consumption of cutting the rocks with low workability by decreasing the cutting heads’ rotational speed thus preventing also the excessive load on the cutting heads drive. Possibilities are presented along with a concept of the heads‘ automatic speed adjustment according to the power utilised in the cutting process.

Role of energy consumption, cutting tool and workpiece materials towards environmentally conscious machining: A comprehensive review

2019 ◽  
Vol 234 (3) ◽  
pp. 335-354 ◽  
Author(s):  
Salman Pervaiz ◽  
Sathish Kannan ◽  
Ibrahim Deiab ◽  
Hossam Kishawy
Keyword(s):  
Energy Consumption ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Process ◽  
Machining Process ◽  
Workpiece Material ◽  
Tool Materials ◽  
Wide Range ◽  
Cutting Operation

Metal-cutting process deals with the removal of material using the shearing operation with the help of hard cutting tools. Machining operations are famous in the manufacturing sector due to their capability to manufacture tight tolerances and high dimensional accuracy while simultaneously maintaining the cost-effectiveness for higher production levels. As metal-cutting processes consume a great amount of input resources and generate some material-based waste streams, these processes are highly criticized due to their high and negative environmental impacts. Researchers in the metal-cutting sector are currently exploring and benchmarking different activities and best practices to make the cutting operation environment friendly in nature. These eco-friendly practices mainly cover the wide range of activities directly or indirectly associated with the metal-cutting operation. Most of the literature for sustainable metal-cutting activities revolves around the sustainable lubrication techniques to minimize the negative influence of cutting fluids on the environment. However, there is a need to enlarge the assessment domain for the metal-cutting process and other directly and indirectly associated practices such as enhancing sustainability through innovative methods for workpiece and cutting tool materials, and approaches to optimize energy consumption should also be explored. The aim of this article is to explore the role of energy consumption and the influence of workpiece and tool materials towards the sustainability of machining process. The article concludes that sustainability of the machining process can be improved by incorporating different innovative approaches related to the energy and tool–workpiece material consumptions.

scholarly journals On the Impact of Climate Change on Building Energy Consumptions: A Meta-Analysis

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 354
Author(s):  
Ludovica Maria Campagna ◽  
Francesco Fiorito
Keyword(s):  
Climate Change ◽  
Energy Consumption ◽  
Climate Change Impacts ◽  
Building Energy ◽  
The Body ◽  
Building Energy Consumption ◽  
Adaptation Measures ◽  
Climate Zones ◽  
Wide Range ◽  
The Impact

The body of literature on climate change impacts on building energy consumption is rising, driven by the urgency to implement adaptation measures. Nevertheless, the multitude of prediction methodologies, future scenarios, as well as climate zones investigated, results in a wide range of expected changes. For these reasons, the present review aims to map climate change impacts on building energy consumption from a quantitative perspective and to identify potential relationships between energy variation and a series of variables that could affect them, including heating and cooling degree-days (HDDs and CDDs), reference period, future time slices and IPCC emission scenarios, by means of statistical techniques. In addition, an overview of the main characteristics of the studies related to locations investigated, building types and methodological approaches are given. To sum up, global warming leads to: (i) decrease in heating consumptions; (ii) increase in cooling consumption; (iii) growth in total consumptions, with notable differences between climate zones. No strong correlation between the parameters was found, although a moderate linear correlation was identified between heating variation and HDDs, and total variation and HDDs. The great variability of the collected data demonstrates the importance of increasing specific impact studies, required to identify appropriate adaptation strategies.

Test Apparatus for Powered Saw Chain Systems

2013 ◽  
Author(s):  
Andrew W. Otto ◽  
John P. Parmigiani
Keyword(s):  
Energy Consumption ◽  
Research Literature ◽  
Future Research ◽  
Test Apparatus ◽  
Operational Parameters ◽  
Design Constraint ◽  
Wide Range ◽  
Reaction Forces ◽  
Battery Technology ◽  
Cutting System

The emergence of battery operated landscaping equipment has driven increased scrutiny of the energy usage of such devices. Energy consumption is a primary design constraint for these new yard tools due to the low energy density of current battery technology compared to gasoline. Consumer battery-powered electric chain saws are an example. In order to provide both portability and usability the system’s power use must be understood in detail. Power use associated with cutting, friction, vibration, chip removal, and parasitic loads are all relevant entities in cutting system design. Interface friction between the cutting chain and bar as well as increases in cutting force due to chain vibration are of particular interest. In this work, a test apparatus capable of determining the efficiency of cutting systems for use on chain saws is designed and constructed. Cutting power and frictional losses can be determined with the device under automated, user specified conditions. Operational parameters including chain velocity, feed velocity, and feed load may be used as feedback for device control. A universal mounting and drive system allows for testing with a wide range of off-the-shelf chains, bars, and drive sprockets. Input torque to the chain and reaction forces on the cutting media are recorded outputs which are used to analyze system efficiency. Preliminary work with the machine confirms trends found in existing research literature. Future research performed with the test apparatus will aid in new product design and enhance understanding of energy consumption in chainsaw cutting systems.

scholarly journals Impact of the COVID-19 Pandemic on the Energy Use at the University of Almeria (Spain)

2021 ◽  
Vol 13 (11) ◽  
pp. 5843
Author(s):  
Mehdi Chihib ◽  
Esther Salmerón-Manzano ◽  
Mimoun Chourak ◽  
Alberto-Jesus Perea-Moreno ◽  
Francisco Manzano-Agugliaro
Keyword(s):  
Energy Consumption ◽  
Energy Use ◽  
Energy Savings ◽  
Electricity Consumption ◽  
Energy Performance ◽  
Energy Sector ◽  
Wide Range ◽  
University Buildings ◽  
The University ◽  
The Impact

The COVID-19 pandemic has caused chaos in many sectors and industries. In the energy sector, the demand has fallen drastically during the first quarter of 2020. The University of Almeria campus also declined the energy consumption in 2020, and through this study, we aimed to measure the impact of closing the campus on the energy use of its different facilities. We built our analysis based upon the dataset collected during the year 2020 and previous years; the patterns evolution through time allowed us to better understand the energy performance of each facility during this exceptional year. We rearranged the university buildings into categories, and all the categories reduced their electricity consumption share in comparison with the previous year of 2019. Furthermore, the portfolio of categories presented a wide range of ratios that varied from 56% to 98%, the library category was found to be the most influenced, and the research category was found to be the least influenced. This opened questions like why some facilities were influenced more than others? What can we do to reduce the energy use even more when the facilities are closed? The university buildings presented diverse structures that revealed differences in energy performance, which explained why the impact of such an event (COVID-19 pandemic) is not necessarily relevant to have equivalent variations. Nevertheless, some management deficiencies were detected, and some energy savings measures were proposed to achieve a minimum waste of energy.

scholarly journals Sustainable Energy Systems: Optimization and Efficiency

2020 ◽  
Vol 10 (12) ◽  
pp. 4405 ◽  
Author(s):  
João Carlos de Oliveira Matias ◽  
Radu Godina ◽  
Edris Pouresmaeil
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Distributed Generation ◽  
Sustainable Energy ◽  
Energy Systems ◽  
World Population ◽  
Special Issue ◽  
Wide Range ◽  
Sustainable Energy Systems ◽  
The Impact

The world population is growing at a very high rate, which also entails a massive increase in energy consumption, and also, therefore, in its production, which is gradually and steadily increasing. Energy and the environment are essential to achieving sustainable development, and constitute a fundamental part of human activity. If we consider energy efficiency as the use of an appliance, process or installation for which we try to produce more energy, but with less energy consumption than the average for these appliances, processes or installations, then achieving a higher energy efficiency is imperative. Energy efficiency is a cornerstone policy on the road to stopping climate change and to achieving sustainable societies, along with the development of renewable energy and an environmentally friendly transport policy. In this Special Issue, 11 selected and peer-reviewed articles have been contributed, on a wide range of topics under the umbrella of sustainable energy systems. The published articles encompass distinct areas of interest. One area addresses distributed generation, which addresses such topics as the optimal planning of distributed generation, protection of blind areas in distribution networks, multi-objective optimization in distributed generation, energy management of virtual power plants in distributed generation, and the impact of demand-response programs on a home microgrid, as well as concentrating solar power into a highly renewable, penetrated power system. The second section of the Special Issue addresses a wide range of topics, from parametric studies of 2 MW gas engines or data centers, to combustion characteristics of a non-premixed oxy-flame, to new techniques of PV Tracking, to applications of nanofluids in the thermal performance enhancement of parabolic trough solar collectors.

Computational Study of the Unsteady Flow Structure of the Buoyancy-Driven Rotating Cavity With Axial Throughflow of Cooling Air

2009 ◽  
Author(s):  
Zain Dweik ◽  
Roger Briley ◽  
Timothy Swafford ◽  
Barry Hunt
Keyword(s):  
Flow Structure ◽  
Rotational Speed ◽  
Operating Conditions ◽  
Structure Evolution ◽  
High Rotational Speed ◽  
Wide Range ◽  
Recirculation Zones ◽  
Cooling Air ◽  
The Impact ◽  
Engine Power

Buoyancy driven flows such as the one that occurs in the inter-disk space of an axial compressor spool plays a major role in determining the gas turbine engine projected life and performance. Details of the developed flow structure inside these spaces largely impact the operating temperatures on the rotating walls of the compressor hardware and therefore impact the life of the machine. In this paper the impact of engine power condition (Idle, Highpower, and Shutdown) on the flow structure for these rotating cavities is studied under a wide range of operating conditions encountered by realistic turbomachines. A computational analysis is performed using commercially available computational tools for grid generation (ICEM-CFD) and turbulent-flow simulation (CFX). A computational test case was developed to imitate the rig-test conditions of Owen and Powell, and computed results were assessed and validated by comparison with their experimental results. A total of fifteen unsteady CFD cases covering a wide range of operating conditions (Rossby Number Ro, Rotational Rayleigh Number Raφ, and axial Reynolds Number Rez) were analyzed. The computed flow results revealed that the flow structure evolution, starting from a steady state solution, is such that radial arms of different number (according to the engine power condition), surrounded by a co-rotating (cyclonic) and counter-rotating (anti-cyclonic) pair of vortices, start to form at different locations. Cold air from the central jet enters the cavity in these arms under the combined action of the centrifugal buoyancy and the Coriolis forces. As time proceeds, the flow structure tends to become virtually invariant with time in a repeatable pattern. The number of radial arms, strength of recirculation zones, and the degree of invasion of the central cooling air toward the shroud are all dependent on the engine power condition. The computations also revealed that at high rotational speed the flow stabilizes, and the unsteady features of the flow structure (cyclonic and anti-cyclonic recirculation zones surrounding the radial arms, radial invasion of the cooling air in the radial arms, and its final impingement upon the shroud surface) eventually disappear after a threshold value of the rotational speed is reached.

scholarly journals Impact of Moisture and Speed of Threshers on Efficiency of Crushing of Lupine Seeds

2020 ◽  
Vol 24 (2) ◽  
pp. 55-63
Author(s):  
Sławomir Gawłowski ◽  
Ryszard Kulig ◽  
Grzegorz Łysiak ◽  
Al Aridhee Jawad Kadhim ◽  
Zdybel Adam ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Rotational Speed ◽  
Raw Material ◽  
Hammer Mill ◽  
Process Variables ◽  
Average Dimension ◽  
Unit Energy ◽  
Four Levels ◽  
Dimension Of Particles ◽  
The Impact

AbstractThe objective of the paper was to determine the impact of moisture and rotational speed of threshers on the process of crushing of lupine seeds. Raw material was led to four levels of moisture from 8 to 14% every 2%. The studies were carried out on the laboratory hammer mill with the use of variable speeds of mill hammers within 5500-7000 rot∙min−1. The studies that were carried out proved significant relations (p<0.05) between the analysed process variables and energy consumption and susceptibility of seeds to crushing. It was stated that along with the increase of the rotational speed, a reduction in the drop of the average dimension of particles of mill takes place. Along with the increase of moisture of lupine from 8 to 14% a unit energy of crushing increases on average by approx. 83%. It was proved that the susceptibility ratio of seeds to crushing increases along with the increase of raw material moisture. Such relations were determined for all investigated rotational speeds of hammers.

Does renewable energy promote green economic growth in OECD countries?

2020 ◽  
Vol 11 (4) ◽  
pp. 771-798 ◽  
Author(s):  
Dilvin Taşkın ◽  
Gülin Vardar ◽  
Berna Okan
Keyword(s):  
Economic Growth ◽  
Renewable Energy ◽  
Energy Consumption ◽  
Trade Openness ◽  
Green Economy ◽  
Renewable Energy Consumption ◽  
Content Type ◽  
Long Run ◽  
Wide Range ◽  
The Impact

Purpose The development of green economy is of academic and policy importance to governments and policymakers worldwide. In the light of the necessity of renewable energy to sustain green economic growth, this study aims to examine the relationship between renewable energy consumption and green economic growth, controlling for the impact of trade openness for Organization for Economic Co-operation and Development countries over the period 1990-2015, within a multivariate panel data framework. Design/methodology/approach To investigate the long-run relationship between variables, panel cointegration tests are performed. Panel Granger causality based on vector error correction models is adopted to understand the short- and long-run dynamics of the data. Furthermore, ordinary least square (OLS), dynamic OLS and fully modified OLS methods are used to confirm the long-run elasticity of green growth for renewable energy consumption and trade openness. Moreover, system generalized method of moment is applied to eliminate serial correlation, heteroscedasticity and endogeneity problems. The authors used the panel Granger causality test developed by Dumitrescu and Hurlin (2012) to infer the directionality of the causal relationship, allowing for both the cross-sectional dependence and heterogeneity. Findings The results suggest that renewable energy consumption and trade openness exert positive effects on green economic growth. The results of long-run estimates of green economic growth reveal that the long-run elasticity of green economic growth for trade openness is much greater than for renewable energy consumption. The estimated results of the Dumitrescu and Hurlin (2012) test reveal bidirectional causality between green economic growth and renewable energy consumption, providing support for the feedback hypothesis. Practical implications This paper provides strong evidence of the contribution of renewable energy consumption on green economy for a wide range of countries. Despite the costs of establishing renewable energy facilities, it is evident that these facilities contribute to the green growth of an economy. Governments and public authorities should promote the consumption of renewable energy and should have a support policy to promote an active renewable energy market. Furthermore, the regulators must constitute an efficient regulatory framework to favor the renewable energy consumption. Social implications Many countries focus on increasing their GDP without taking the environmental impacts of the growth process into account. This paper shows that renewable energy consumption points to the fact that countries can still increase their economic growth with minimal damage to environment. Despite the costs of adopting renewable energy technologies, there is still room for economic growth. Originality/value This paper provides evidence on the contribution of renewable energy consumption on green economic growth for a wide range of countries. The paper focuses on the impact of renewable energy on economic growth by taking environmental degradation into consideration on a wide scale of countries.

scholarly journals Impact of Heating Control Strategy and Occupant Behavior on the Energy Consumption in a Building with Natural Ventilation in Poland

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4304 ◽  
Author(s):  
Aniela Kaminska
Keyword(s):  
Energy Consumption ◽  
Natural Ventilation ◽  
Energy Savings ◽  
Control Algorithms ◽  
Occupant Behavior ◽  
Set Point ◽  
Wide Range ◽  
Window Opening ◽  
Calculation Results ◽  
The Impact

This study aims to provide an experimental assessment of energy consumption in an existing public building in Poland, in order to analyze the impact of occupant behavior on that consumption. The building is naturally ventilated and the occupants have the freedom to change the temperature set point and open or close the windows. The energy consumption is calculated and the calculation results are compared with the experimental data. An analysis of occupants’ behavior has revealed that they choose temperature set points in a wide range recognized as thermal comfort, and window opening is accidental and difficult to predict. The implemented heating control algorithms take into account the strong influence of individual occupant preferences on the feeling of comfort. The energy consumption assessment has revealed that the lowering of temperature set point by 1 °C results in an energy saving of about 5%. Comparisons of energy consumption with heating control and without any controls showed that the potential for energy reduction due to heating control reached approximately 10%. The use of windows control, which allows to turn off the heating after opening the window and its impact on energy savings have been discussed as well.

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