scholarly journals Effect of Texture on Energy Consumption for High Frequency Hydraulic Impact Piston Pair

2020 ◽  
Author(s):  
Hu Mo ◽  
Yong Guo ◽  
Hu Yanping ◽  
Song Quan ◽  
Zhewu Chen
Keyword(s):  
Energy Consumption ◽  
High Frequency ◽  
Energy Utilization ◽  
Friction Loss ◽  
Analysis Model ◽  
Hydraulic Impact ◽  
Depth Ratio ◽  
Piston Pair ◽  
Optimum Depth ◽  
The Impact

Abstract Limited by the influence of the traditional clearance seal structure on the leakage and friction loss of the piston pair, the energy utilization ratio of the hydraulic impactor is difficult to improve. As such, a novel clearance seal structure with cylindrical texture for the impact piston is proposed to solve it. Considering the leakage and friction loss of impact piston pair, an energy consumption evaluation index is put forward. Based on the average Reynolds equation, an energy consumption analysis model for a textured high-frequency hydraulic impact piston pair is established, and the influence of piston texture parameters for the YG45 hydraulic impactor on energy consumption under rated working conditions is studied. The results show that energy consumption of an impact piston pair accounts for 29.77% of total energy loss. The variation of area ratio textured makes the ratio of energy consumption to the piston pair decline 1.32%~10.98%, where the optimum area rate textured is 0.64 ~ 0.7. The variation of depth ratio textured leads to the reduction of the ratio of energy consumption to piston pair by 3.21% ~ 5.68%, where the optimum depth ratio textured is 1 ~ 1.1.The texture structure of the piston pair significantly reduces the energy consumption of the impact piston pair, and it is an effective approach to avoid the design dilemma for the conventional impact piston pair.

Analysis of lubrication and sealing performance on textured piston pair with multi-factor coupling

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Song Quan ◽  
Yong Guo ◽  
Xuedong Liu ◽  
Zhewu Chen ◽  
Yudi Liu
Keyword(s):  
Energy Consumption ◽  
Optimization Design ◽  
Great Influence ◽  
Diameter Ratio ◽  
Content Type ◽  
Hydraulic Impact ◽  
Sealing Performance ◽  
Lubrication Performance ◽  
Low Energy Consumption ◽  
Piston Pair

Purpose This paper aims to study the lubrication and sealing performance on the textured piston pair under the cross action of the shape and structure parameters. This paper further carries out the optimization design of low energy consumption hydraulic impact piston pair. Design/methodology/approach Based on the characteristics of the ring gap seal piston pair, the flow field analysis model of the whole film gap is established for its periodic treatment. The friction power loss of the piston pair is defined as the evaluation index of the lubrication performance and the leakage power loss as the evaluation index of the sealing performance. The orthogonal test design and CFD software were used to analyze the lubrication and sealing performance of the textured piston pair. Findings The cross action of shape and structure factors has a great influence of the lubrication and sealing performance on the textured piston pair. Clearance and shape parameters have great influence on it, while seal length and depth diameter ratio have little influence. The sealing performance of conical textured piston pair is good, while the lubrication performance of square textured piston pair is good. The primary and secondary order of influence of shape and structure on energy consumption on piston pair is B (seal clearance) > C (texture shape) > D (area ratio) > A (seal length) > E (depth diameter ratio). Originality/value Breaking the defect of local optimization design on traditional piston pair structure, then find the matching relationship of structural parameters on textured piston pair. Further improve the lubrication and sealing performance of the piston pair, and provide reference for the global optimization design of the low energy consumption hydraulic impact piston pair.

Analysis of China’s Provincial Energy Efficiency Based on the Generalized DEA Method

2014 ◽  
Vol 953-954 ◽  
pp. 890-895
Author(s):  
Hui Min Li ◽  
Cun Bin Li ◽  
Zhan Xin Ma
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Total Energy Consumption ◽  
Rapid Economic Growth ◽  
Technology Changes ◽  
Dea Method ◽  
Save Energy ◽  
The Impact

In recent years, with the rapid economic growth, the demand on the amount of energy in China is increasing. So the problem of how to improve the energy utilization efficiency and save energy consumption has to be tackled. The traditional CCR model and BCC model used in the study of provincial energy efficiency do not take the impact of technological progress into consideration. Therefore, the paper uses the generalized DEA method to research the energy utilization efficiency of China’s 29 provinces, that is, to evaluate and analyze the energy utilization efficiency by selecting the capital stock, employment and total energy consumption of China’s provinces as input factors and GDP, per capital GDP as output factors, and then draw tables showing each province’s change of average annual overall efficiency and the pure technology changes, and finally analyze the regularities underlying these changes.

scholarly journals Drivers and Policy Choices of Industrial Total-Factor Coal Productivity: Evidence From Eastern China

2021 ◽  
Vol 8 ◽  
Author(s):  
Di Wang ◽  
Yueying Zhao ◽  
Zhiyuan Zhang ◽  
Xiaodi Yang ◽  
Xinchen Wen
Keyword(s):  
Economic Development ◽  
Energy Consumption ◽  
Eastern China ◽  
Energy Utilization ◽  
Eastern Region ◽  
Local Conditions ◽  
Frontier Analysis ◽  
Regulatory Policies ◽  
The Impact ◽  
D Investment

Identifying the critical factors of industrial total-factor coal productivity (TCP) and its promotion paths will help achieve the goals of regional energy conservation and pollution reduction. Based on the perspective of total-factor productivity, this paper integrates the methods of stochastic frontier analysis (SFA), Kaya identity, and STIRPAT model to systematically diagnose the temporal and spatial characteristics and the heterogeneous sources of the industrial TCP in 11 provinces of eastern China, and it proposes some differentiated regulatory policies for different provinces. The results show that the TCP is increasing year by year and tends to converge, which indicates that increasing TCP is more and more challenging. Further research shows that there are significant spatial differences in the impact of the economic development level (EDL), industrial economic structure (IES), energy consumption intensity (ECI), and energy consumption structure (ECS) on industrial TCP. As the original driving factors of technological progress, the impact of R&D investment intensity (RII) and R&D investment levels (RIL) on industrial TCP is relatively consistent in different regions. The former has a negative congestion effect on TCP due to the imbalance of R&D investment structure, while the latter has a positive effect on TCP. Therefore, the eastern region should increase R&D expenditure and optimize R&D expenditure structure as a general way to improve TCP in each region and adopt differentiated regulatory policies in economic development and energy utilization according to local conditions.

scholarly journals On the impact of sampling frequency on software energy measurements

2015 ◽  
Author(s):  
Rubén Saborido ◽  
Venera Arnaoudova ◽  
Giovanni Beltrame ◽  
Foutse Khomh ◽  
Giuliano Antoniol
Keyword(s):  
Energy Consumption ◽  
Mobile Applications ◽  
High Frequency ◽  
Sampling Frequency ◽  
Low Frequencies ◽  
Median Error ◽  
Android Applications ◽  
Reduce Energy Consumption ◽  
The Impact ◽  
Closed Source

Energy consumption is a major concern when developing and evolving mobile applications and researchers are investigating ways to reduce energy consumption. We conjecture that these studies are at the border between hardware and software and we must be careful on how the energy consumption is measured. To the best of our knowledge, no previous work investigates how much energy and power consumption is due to high frequency events missed when sampling at low frequencies such as 10 kHz and verified the error at the precision of method level. In this paper, we propose an approach for accurate measurements of the energy consumption of mobile applications. We apply the proposed approach to assess the energy consumption of 21 mobile, closed source, applications and four open source Android applications. We show that by sampling at 10 kHz one may expect a median error of 8%, however, such error may be as high as 50%.

scholarly journals Research on the Impact of Industrial Development on Energy Utilization Efficiency under the Background of Urban Agglomeration Planning

2021 ◽  
Vol 283 ◽  
pp. 02026
Author(s):  
Yuan Zheng ◽  
Bo Yue ◽  
Xuesong Han ◽  
Zheng Li
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Industrial Development ◽  
Urban Agglomeration ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Total Energy Consumption ◽  
Central Cities ◽  
Urban Agglomerations ◽  
The Impact

At present, the trend of central cities leading the development of urban agglomerations and urban agglomerations driving regional development is becoming more and more significant. Based on the panel data of 16 cities in the Chengdu-Chongqing urban agglomeration from 2010 to 2015, this paper uses a fixedeffect model to study the relationship between industrial development and energy efficiency in urban agglomerations, central cities, and surrounding cities. The empirical results show that for the overall urban agglomerations, central cities and surrounding cities, the scale of the secondary industry has a negative correlation with energy consumption per unit of GDP. Industrial development will increase the total energy consumption, but it also contributes to energy efficiency. In order to achieve the goal of "carbon peak and carbon neutrality", cities must find a balance in development and seek ecological protection during development.

scholarly journals Evaluation of the Energy Utilization Index in Sheep Milk Cooling Systems

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2127
Author(s):  
Marco Cossu ◽  
Luigi Ledda ◽  
Stefania Solinas ◽  
Andrea Cossu ◽  
Antonio Pazzona
Keyword(s):  
Energy Consumption ◽  
Energy Cost ◽  
Dairy Farms ◽  
Energy Utilization ◽  
Energy Monitoring ◽  
Cooling Systems ◽  
Sheep Milk ◽  
Economic Balance ◽  
The Impact ◽  
Original Information

The energy consumption of sheep milk cooling systems (MCSs) was quantified in this study to provide original information filling a literature gap on the impact of sheep milk cooling on the energy and economic balance in dairy farms. Performance and energy monitoring tests were conducted simultaneously on 22 MCSs in Sardinia (Italy). The results determined the cooling time as a function of the performance class and number of milkings. The Energy Utilization Index (EUI) was applied to measure the energy required to cool down the milk and estimate the incidence on its price. The average EUI was 1.76 kWh 100 L−1 for two-milkings and 2.43 kWh 100 L−1 for four-milkings MCSs, whereas the CO2 emissions ranged from 998 to 1378 g CO2 100 L−1 for two- and four-milkings MCSs, respectively. The estimated energy consumption for the storage of refrigerated sheep milk was 0.12 kWh 100 L−1. The malfunctioning MCSs averagely consumed 31% more energy than regular systems. The energy cost for cooling accounted for 0.61% on the current sheep milk price in Italy. Based on the analysis, the reported EUI values can be used as a preliminary indicator of the regular operation of MCSs.

scholarly journals Analysis of the Impact of China’s Energy Consumption Structure on Energy Security

2021 ◽  
Vol 245 ◽  
pp. 01054
Author(s):  
Wang Ning ◽  
Li Zhao ◽  
Zhang Bei
Keyword(s):  
Energy Consumption ◽  
Energy Security ◽  
Energy Demand ◽  
Greenhouse Gas Emission ◽  
Energy Utilization ◽  
Practical Significance ◽  
Utilization Rate ◽  
Consumption Structure ◽  
Depth Analysis ◽  
The Impact

Energy, as the guarantee of China’s economic development, plays an important role in it. Nowadays, however, oil production almost reaches its upper limit and is going downhill. The yearly rising output of natural gas fails to meet the increasingly huge energy demand. Although coal reserves are large, it still gets into a bottleneck period due to environmental and technological reasons. Therefore, the adjustment and optimization of energy consumption structure is the primary problem for China’s energy security, and it has become, and will still remain as the core of China’s energy strategy in the future. So, it is of great theoretical and practical significance to delve into the inter relationship between energy consumption structure and energy security, and then to optimize energy consumption structure under the new situation. After an in-depth analysis on how to adjust the energy consumption structure to ensure energy security, the author finds several problems, for instance, an unreasonable energy consumption structure, a serious environmental pollution, a low energy utilization rate, and a recessive role of energy price market. To solve the practical problems, this paper puts forward three measures namely deepening the supply side reform, accelerating the energy technology innovation, and changing the concept in energy use. The improvement in energy consumption structure is not only of general significance to improve the energy security theory, but also of great significance for China to achieve the goal of greenhouse gas emission reduction and ensure energy security.

scholarly journals Unlocking the investment impact of biomass energy utilization on environmental degradation for an isolated island

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bright Akwasi Gyamfi ◽  
Divine Q. Agozie ◽  
Murad A. Bein ◽  
Festus Victor Bekun ◽  
Festus Fatai Adedoyin
Keyword(s):  
Carbon Dioxide ◽  
Energy Consumption ◽  
Carbon Dioxide Emission ◽  
Well Being ◽  
Biomass Energy ◽  
Energy Utilization ◽  
Series Data ◽  
Biomass Utilization ◽  
Content Type ◽  
The Impact

Purpose Discussions on environment-friendly production connected with the concerns of growing biomass emissions have gained much attention. In this regard, this study aims to explore the issue of biomass energy consumption and its related emission effects on the economic and environmental well-being of the economy of Cyprus. Design/methodology/approach This study sources time series data on specific variables from the Global Material Flow and the World Bank’s World Development Indicators (WDI, 2020) between 1990 and 2016. The Robust least square (ROB-L2) in conjunction with Pesaran autoregressive distributed lag (ARDL) methodology analysis techniques was used in addition to the Granger causality tests to examine the direction of causality flow between the variables under consideration. Findings The results indicate that biomass energy usage in the long run reduces pollution and negatively correlates with CO2 emissions level. Also, the decline of emission is influenced by increased foreign direct investment (FDI), thus, activities of foreign investors contribute to combating emission in the country. According to empirical results, non-renewable energy consumption showed both positive and negative influences on increased emission level, whereas economic growth is increasing carbon dioxide emission for the case of Cyprus. Originality/value This study applies current reliable data that offers renewed insights and sheds light on the state of affairs on biomass utilization from a developing country perspective. Additionally, it extends the discourse on the impact of biomass utilization on CO2 emissions by considering the impact of FDI, trade flow and energy consumption in a carbon-income function built on the liner version of the environmental Kuznets curve hypothesis. Although this is by no means exhaustive, the study pioneers the discourse on how FDI with biomass utilization among other relevant variables influences carbon dioxide emission.

scholarly journals Coordinated Speed Control Strategy for Minimizing Energy Consumption of a Shearer in Fully Mechanized Mining

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1224
Author(s):  
Zheng Zheng ◽  
Dilei Chen ◽  
Tao Huang ◽  
Guopeng Zhang
Keyword(s):  
Energy Consumption ◽  
Coal Mining ◽  
Rotational Speed ◽  
Critical Role ◽  
Energy Utilization ◽  
Coordination Strategies ◽  
Working Cycle ◽  
Study Results ◽  
Model Control ◽  
The Impact

As one of the major pieces of equipment in fully mechanized coal mining, the drum shearer plays a critical role in improving the efficiency and energy utilization in the coal mining production process. In this paper, an energy consumption model of a shearer, derived from the analysis of the cutting and traction resistances on the shearer during different processes within a working cycle, is established. Based on the derived model, control and coordination strategies between the two speeds are proposed to minimize the shearer’s energy consumption in unidirectional mining. The case study of a real coal mine shows that the proposed models are valid, and the optimal control of shearer speeds can effectively reduce the energy consumption by 5.16% in a working cycle. To gain further insights into the impact of traction speed and drum rotational speed on the shearer’s energy consumption, several speed coordination cases are employed to further compare with the optimized one. Our study results show that the energy consumption of a shearer can be decreased with the increase of traction speed while decreasing drum rotational speed in coordination.

Impact of roof shading on building energy performance in warm & humid climatic places of India

2020 ◽  
pp. 50-64
Author(s):  
Kuladeep Kumar Sadevi ◽  
Avlokita Agrawal
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Performance ◽  
General Assumption ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Passive Cooling ◽  
Base Case ◽  
U Value ◽  
The Impact

With the rise in awareness of energy efficient buildings and adoption of mandatory energy conservation codes across the globe, significant change is being observed in the way the buildings are designed. With the launch of Energy Conservation Building Code (ECBC) in India, climate responsive designs and passive cooling techniques are being explored increasingly in building designs. Of all the building envelope components, roof surface has been identified as the most significant with respect to the heat gain due to the incident solar radiation on buildings, especially in tropical climatic conditions. Since ECBC specifies stringent U-Values for roof assembly, use of insulating materials is becoming popular. Along with insulation, the shading of the roof is also observed to be an important strategy for improving thermal performance of the building, especially in Warm and humid climatic conditions. This study intends to assess the impact of roof shading on building’s energy performance in comparison to that of exposed roof with insulation. A typical office building with specific geometry and schedules has been identified as base case model for this study. This building is simulated using energy modelling software ‘Design Builder’ with base case parameters as prescribed in ECBC. Further, the same building has been simulated parametrically adjusting the amount of roof insulation and roof shading simultaneously. The overall energy consumption and the envelope performance of the top floor are extracted for analysis. The results indicate that the roof shading is an effective passive cooling strategy for both naturally ventilated and air conditioned buildings in Warm and humid climates of India. It is also observed that a fully shaded roof outperforms the insulated roof as per ECBC prescription. Provision of shading over roof reduces the annual energy consumption of building in case of both insulated and uninsulated roofs. However, the impact is higher for uninsulated roofs (U-Value of 3.933 W/m2K), being 4.18% as compared to 0.59% for insulated roofs (U-Value of 0.33 W/m2K).While the general assumption is that roof insulation helps in reducing the energy consumption in tropical buildings, it is observed to be the other way when insulation is provided with roof shading. It is due to restricted heat loss during night.

Sign in / Sign up

Export Citation Format

Share Document