scholarly journals Two-Stage Integer Programing Model for Building Retrofit Planning for Energy Saving in South Korea

2017 ◽  
Vol 9 (11) ◽  
pp. 2087 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
South Korea ◽  
Energy Saving ◽  
Two Stage ◽  
Building Retrofit ◽  
Integer Programing

Two-stage in situ gas stripping for enhanced butanol fermentation and energy-saving product recovery

2013 ◽  
Vol 135 ◽  
pp. 396-402 ◽  
Author(s):  
Chuang Xue ◽  
Jingbo Zhao ◽  
Fangfang Liu ◽  
Congcong Lu ◽  
Shang-Tian Yang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Product Recovery ◽  
Gas Stripping ◽  
Two Stage ◽  
Butanol Fermentation

scholarly journals Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving

2020 ◽  
Vol 68 (8) ◽  
pp. 4919-4932 ◽  
Author(s):  
Nan Qi ◽  
Nikolaos I. Miridakis ◽  
Ming Xiao ◽  
Theodoros A. Tsiftsis ◽  
Rugui Yao ◽  
...  
Keyword(s):  
Energy Saving ◽  
Communication Networks ◽  
Two Stage

Energy saving in two-stage reverse osmosis systems coupled with ultrafiltration processes

Desalination ◽  
2005 ◽  
Vol 184 (1-3) ◽  
pp. 125-137 ◽  
Author(s):  
E. Cardona ◽  
A. Piacentino ◽  
F. Marchese
Keyword(s):  
Energy Saving ◽  
Reverse Osmosis ◽  
Two Stage

Assess Energy-Saving-Project with Two-Stage Evaluation Method

2012 ◽  
Vol 524-527 ◽  
pp. 2406-2410
Author(s):  
Mou Jia
Keyword(s):  
Carbon Dioxide ◽  
Energy Saving ◽  
Price Index ◽  
Evaluation Method ◽  
Energy Resources ◽  
Carbon Taxes ◽  
Two Stage ◽  
A Company

Analyzing the energy-saving-project of a company with two-stage evaluation method. Analyzing whether the energy-saving project can reduce the consumption of energy with exergy theory, and then evaluating how much money will be saved by the project. First, there must be energy resources saved, discussing the value of the saved coal mainly with the price index of coal. Second, the generation of carbon dioxide accompanies the consumption of coal. Many countries are going to or have implemented carbon taxes. The paper discusses the reduction of carbon taxes of the energy saving projects.

scholarly journals A Single-Stage High Power Factor Power Supply for Providing an LED Street-Light Lamp Featuring Soft-Switching and Bluetooth Wireless Dimming Capability

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 477
Author(s):  
Chun-An Cheng ◽  
Hung-Liang Cheng ◽  
Chien-Hsuan Chang ◽  
En-Chih Chang ◽  
Wei-Shiang Hung ◽  
...  
Keyword(s):  
Energy Saving ◽  
Power Factor ◽  
High Power ◽  
Power Supply ◽  
Buck Converter ◽  
Single Stage ◽  
Two Stage ◽  
High Power Factor ◽  
Power Switches ◽  
Dimming Control

Light-emitting diode (LED) has the characteristics of environmental protection and energy saving, having become the lighting source of a new generation of street-light lamps. The traditional two-stage power supply for providing an LED street-light lamp is composed of an AC-DC converter with a power-factor-correction (PFC) function at the front stage and a DC-DC converter at the rear stage. The two-stage power supply for an LED street-light lamp has a large number of electronic components and costs, and the circuit efficiency is not high. Therefore, this paper presents a novel single-stage high power factor AC-DC power supply for providing an LED street-light lamp featuring soft-switching and Bluetooth wireless dimming capability through using smart tablets or smartphones to remote control the output power of the LED street-light lamp for achieving energy-saving benefits. The proposed AC-DC LED power supply integrates an interleaved buck converter circuit with coupled inductors and a half-bridge LLC resonant converter circuit into a single-stage power conversion circuit. Moreover, the coupled inductor of the interleaved buck converter circuit is designed to operate in the discontinuous conduction mode, which can naturally achieve PFC. In addition, the two power switches in the novel LED power supply have zero-voltage switching (ZVS) characteristics, which can reduce the switching losses of the power switches. The two output diodes have the characteristics of zero-current switching (ZCS), which can reduce the conduction losses of the power diodes. This paper developed a single-stage prototype circuit for providing an 144 W (36 V/4 A)-rated LED street-light lamp. According to the experimental results of the prototype circuit with an AC input voltage of 110 volts, the presented single-stage LED power supply offers high power factor (PF > 0.99), low input-current total harmonic distortion factor (THD < 3%), and high efficiency (>89%). In addition, this paper used the built-in Bluetooth wireless communication function of a smart tablet or smart phone to fulfill remote dimming control. By changing the duty ratio of the control signal, we could realize remote dimming control of 20% to 100% of the output LED street-light lamp power.

scholarly journals A Two-stage Strategy to Optimize Energy Consumption for Latency-critical Workload under QoS Constraint

2020 ◽  
Vol 49 (4) ◽  
pp. 608-621
Author(s):  
Jingwei Li ◽  
Duanyu Teng ◽  
Jinwei Lin
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
High Frequency ◽  
Data Centers ◽  
Energy Costs ◽  
Threshold Method ◽  
Two Stage ◽  
Dynamic Voltage ◽  
Great Energy

Data centers afford huge energy costs. Saving energy while providing efficient quality of service (Qos) is the goal pursued by data centers. But this is a challenging issue. To ensure the Qos of latency-critical applications, data centers always schedule processors to run at higher frequencies. The continuous high frequency operation will cause great energy waste. Modern processors are equipped with dynamic voltage and frequency scaling (DVFS) technology, which allows the processor to run at every frequency levels it supports, so we focus on how to use DVFS to trade-off between energy and Qos. In this paper, we propose a two-stage strategy based on DVFS to dynamically scaling the CPU frequency during latency-critical workload execution, aimed at minimizing the energy consumption for latency-critical workload which is under the Qos constraint. The two-stage strategy includes a static stage and dynamic stage, which are worked together to determine the optimal frequency for running workload. The static stage uses a well designed heuristic algorithm to determine the frequency-load matches under Qos constraint, while the dynamic stage leverages a threshold method to determine whether to adjust the pre-set frequency. We evaluate the two-stage strategy in terms of Qos and energy saving on the cloudsuite benchmark, and compares the two metrics with the-state-of art Ondemand. Results show that our strategy is superior to Ondemand for energy saving, improving more than 13%.

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