Process Optimization of One-Stage Propane Pre-Cooled MRC Cycle for Small-Scale LNG Plant

2012 ◽  
Vol 516-517 ◽  
pp. 1184-1187
Author(s):  
Heng Sun ◽  
Dan Shu ◽  
Hong Mei Zhu
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Process Parameters ◽  
Large Scale ◽  
High Energy ◽  
Small Scale ◽  
Main Process ◽  
One Stage ◽  
High Energy Efficiency ◽  
The One

One-stage pre-cooled mixture refrigerant cycle can be applied in small-scale LNG plant and be special suitable for skit mounted LNG plant. It has different character with the C3MR cycle used in large-scale LNG plant. The optimization of the mixture refrigerant is carried out using HYSYS software. The effect of the main process parameters on the performance of the cycle is calculated and discussed. The result shows that appropriate ranges of the process parameters exist. Higher and lower values of the parameters will increase the energy consumption significantly. The results also indicate that the optimization of the one-stage pre-cooled mixture refrigerant cycle can obtain rather high energy efficiency that is competitive with that of the SMR which is widely employed in small-scale LNG plant.

scholarly journals Efficient Hybrid Emergency Aware MAC Protocol for Wireless Body Sensor Networks

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3572 ◽  
Author(s):  
Nadine Bou Dargham ◽  
Abdallah Makhoul ◽  
Jacques Bou Abdo ◽  
Jacques Demerjian ◽  
Christophe Guyeux
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Sensor Networks ◽  
Mac Protocol ◽  
High Energy ◽  
Body Sensor Networks ◽  
Emergency Situations ◽  
High Energy Efficiency ◽  
Periodic Traffic ◽  
Packet Drop

In Body Sensor Networks (BSNs), two types of events should be addressed: periodic and emergency events. Traffic rate is usually low during periodic observation, and becomes very high upon emergency. One of the main and challenging requirements of BSNs is to design Medium Access Control (MAC) protocols that guarantee immediate and reliable transmission of data in emergency situations, while maintaining high energy efficiency in non-emergency conditions. In this paper, we propose a new emergency aware hybrid DTDMA/DS-CDMA protocol that can accommodate BSN traffic variations by addressing emergency and periodic traffic requirements. It takes advantage of the high delay efficiency of DS-CDMA in traffic burst, and the high energy efficiency of DTDMA in periodic traffic. The proposed scheme is evaluated in terms of delay, packet drop percentage, and energy consumption. Different OPNET simulations are performed for various number of nodes carrying emergency data, and for various payload sizes. The protocol performance is compared to other existing hybrid protocols. Results show that the proposed scheme outperforms the others in terms of delay and packet drop percentage for different number of nodes carrying emergency data, as well as for different payload sizes. It also offers the highest energy efficiency during periodic observation, while adjusting the energy consumption during emergency by assigning spreading codes only to nodes holding emergency data.

scholarly journals Effectiveness of High Energy Efficiency to Minimize Energy Consumption for Residential Buildings in Egypt

2020 ◽  
Vol 165 (0) ◽  
pp. 78-95
Author(s):  
Gehad Mohamed Abdelsalam ◽  
Zeinab Mohamed EL Razzaz ◽  
Fatma Elnekhaily
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Residential Buildings ◽  
High Energy ◽  
High Energy Efficiency

Energy Efficient Manufacturing of Power Electronics Substrates through Selective Laser Melting Technology

2016 ◽  
Vol 856 ◽  
pp. 188-194 ◽  
Author(s):  
Aarief Syed-Khaja ◽  
Jonathan Stecher ◽  
Alireza Esfandyari ◽  
Sven Kreitlein ◽  
Jörg Franke
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Manufacturing Sector ◽  
High Energy ◽  
Energy Prices ◽  
Laser Melting ◽  
Melting Technology ◽  
Process Comparison

In view of rising energy prices, high-energy consumption, and the associated environmental problems, in recent years the focus was shifted on the demand for energy and resource efficiency in the manufacturing sector. In the context of the project ‘PowerSLAM’ under Green Factory Bavaria Project, the feasibility of selective laser melting technology (SLM) for the production of ceramic circuit carriers is investigated. In this paper, an overview on the comparison of the state-of-the-art technologies with SLM technology is given in the perspective of energy and resource consumption. Parallelly the results of the investigations of SLM technology i.e. process feasibility and optimization for melting of copper based powders on ceramic substrates is summarized. The process parameters such as laser power, laser scan velocity and scan strategies are investigated. Based on the energy measurements, the process parameters are optimized accordingly for efficient process and overview on the resource and energy consumption is given. Demonstrators are built based on confined parameter combinations showing the process compatibility and the efficiencies are calculated accordingly. Here the approach bottom-up is considered to do the comprehensive process comparison and the energy efficiency value is considered in accessing the process and related energy efficiency.

scholarly journals Study on System Frame of China Industry Boilers Energy Efficiency Standards

2018 ◽  
Vol 175 ◽  
pp. 04003
Author(s):  
Ren Liu ◽  
Yuejin Zhao ◽  
Lili Chen ◽  
Haihong Chen
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Co2 Emission ◽  
Central Government ◽  
High Energy ◽  
Industry Standards ◽  
Reduce Energy Consumption ◽  
High Energy Efficiency ◽  
Energy Efficiency Standards

Energy consumption is always concerned by China government, from 11th five years plan, central government and departments are trying to deduce the energy consumption and CO2 emission. Massive energy were consumed by industry boiler that pointed out by investigation of energy in China industry, standards for boilers, specially energy efficiency standards are always considered to be a key approach to reduce energy consumption and promote high energy efficiency technology. From the results of survey, industry boiler energy efficiency standards are indeed useful to reduce energy consume. In this paper, we try to research on China industry boilers energy efficiency standards, based on that we concluded the system of China industry boiler energy efficiency standards, and listed all the index of those energy efficiency standards which force to comply. It is very useful to make everyone to understand China industry boiler, and industry boiler energy efficiency standards.

Reactions in Activated Peroxide Systems and their Influences on Bleaching Performance

2020 ◽  
Vol 17 ◽  
Author(s):  
Xiaoyan Wang ◽  
Jinmei Du ◽  
Changhai Xu
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Energy Efficiency ◽  
Textile Industry ◽  
High Energy ◽  
Side Reactions ◽  
Competitive Reactions ◽  
High Energy Efficiency ◽  
Hydrolysis Of ◽  
Bleach Activators

Abstract:: Activated peroxide systems are formed by adding so-called bleach activators to aqueous solution of hydrogen peroxide, developed in the seventies of the last century for use in domestic laundry for their high energy efficiency and introduced at the beginning of the 21st century to the textile industry as an approach toward overcoming the extensive energy consumption in bleaching. In activated peroxide systems, bleach activators undergo perhydrolysis to generate more kinetically active peracids that enable bleaching under milder conditions while hydrolysis of bleach activators and decomposition of peracids may occur as side reactions to weaken the bleaching efficiency. This mini-review aims to summarize these competitive reactions in activated peroxide systems and their influence on bleaching performance.

scholarly journals Optimization of injection molding process for car fender in consideration of energy efficiency and product quality

2014 ◽  
Vol 1 (4) ◽  
pp. 256-265 ◽  
Author(s):  
Hong Seok Park ◽  
Trung Thanh Nguyen
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Injection Molding ◽  
Product Quality ◽  
Process Parameters ◽  
Optimization Problems ◽  
Computational Cost ◽  
Injection Molding Process ◽  
Molding Process ◽  
Nsga Ii

Abstract Energy efficiency is an essential consideration in sustainable manufacturing. This study presents the car fender-based injection molding process optimization that aims to resolve the trade-off between energy consumption and product quality at the same time in which process parameters are optimized variables. The process is specially optimized by applying response surface methodology and using nondominated sorting genetic algorithm II (NSGA II) in order to resolve multi-object optimization problems. To reduce computational cost and time in the problem-solving procedure, the combination of CAE-integration tools is employed. Based on the Pareto diagram, an appropriate solution is derived out to obtain optimal parameters. The optimization results show that the proposed approach can help effectively engineers in identifying optimal process parameters and achieving competitive advantages of energy consumption and product quality. In addition, the engineering analysis that can be employed to conduct holistic optimization of the injection molding process in order to increase energy efficiency and product quality was also mentioned in this paper.

High Energy Efficiency and Stability for Photoassisted Aqueous Lithium–Iodine Redox Batteries

2016 ◽  
Vol 1 (4) ◽  
pp. 806-813 ◽  
Author(s):  
Georgios Nikiforidis ◽  
Keisuke Tajima ◽  
Hye Ryung Byon
Keyword(s):  
Energy Efficiency ◽  
High Energy ◽  
High Energy Efficiency
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