scholarly journals Modeling of the Optimal Operation Pattern for Energy Saving of The Trains

2014 ◽  
Vol 19 (12) ◽  
pp. 187-196
Author(s):  
Jung-Hyun Kim ◽  
Se-Hoon Lee ◽  
Sang-Pyo Jun
Keyword(s):  
Energy Saving ◽  
Optimal Operation ◽  
Operation Pattern

scholarly journals Analisa Keseimbangan Energi PLTU Takalar (Punagaya) Unit 2 Berdasarkan Perubahan Beban

2021 ◽  
Vol 18 (2) ◽  
pp. 257
Author(s):  
Makmur Saini ◽  
Nur Hamzah ◽  
Devi Prasetyo Utomo
Keyword(s):  
Energy Balance ◽  
Energy Loss ◽  
Heat Rate ◽  
Electrical Energy ◽  
Optimal Operation ◽  
Steam Power ◽  
Energy Balance Method ◽  
Full Load ◽  
Operation Pattern ◽  
Operating Target

This study aims to calculate the efficiency and heat rate of the unit 2 PLTU Takalar (Punagaya) system with the energy balance calculation method, calculate the NPHR value of PLTU Takalar (Punagaya) unit 2 when the unit is operating, and also to determine the energy loss from the conversion energy results at PLTU Takalar (Punagaya) unit 2 when the unit operates. The PLTU's Net Plant Heat Rate (NPHR) value is a very important role as an indicator of the performance of a steam power plant. The real-time NPHR value calculation using the energy balance method can be used as an evaluation material to control the operation pattern of the generator in order to obtain optimal operation. The method used in this research is to collect direct and indirect data to calculate the energy balance and NPHR of PLTU Takalar (Punagaya) unit 2 during the reliability run period. The calculations carried out include the calculation of the energy balance in the boiler, the energy balance in the steam cycle, the balance of electrical energy, the efficiency of the PLTU and NPHR systems. Based on the results of calculations that have been carried out the efficiency and NPHR of PLTU Takalar (Punagaya) unit 2 is the best during the reliability run of 32.76% and 2801.93 kcal / kWh at full load conditions with an energy loss value of 220.60 MW. The performance of PLTU Takalar (Punagaya) unit 2 during the reliability run is very good where the unit operates continuously and the NPHR value when full load fulfills the contract warranty and the maximum operating target. 

scholarly journals Intelligent Calculation Model and Algorithm Optimization of Optimal Operation of Integrated Energy System

2021 ◽  
Vol 2083 (3) ◽  
pp. 032033
Author(s):  
Kun Wang ◽  
Guochao Yang ◽  
Baohua Cheng ◽  
Zhiyong Gan ◽  
Yan Qi ◽  
...  
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Energy System ◽  
Calculation Model ◽  
Optimal Operation ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Saving Effect

Abstract This paper analyzes the energy saving effect and optimal operation of the integrated park type energy system. The park type integrated energy system includes photovoltaic power generation system, ground source heat pump system, solar air conditioning system, regenerative electric boiler system and solar hot water system and so on. The energy saving benefit calculation model of each subsystem is established, and according to the operation history data of each subsystem, the calculation results of each subsystem are analyzed. It shows that: The energy saving income of photovoltaic power generation system is 734,200 yuan/year. The main revenue comes from the second and third quarters, during which it should pay attention to the maintenance of photovoltaic modules to ensure the maximum energy saving benefit. The energy saving income of ground source heat pump system in summer is 155,900 yuan/year, and the energy saving effect is not significant. It can cooperate with traditional units for cooling in summer. The heating in winter in the park is provided by ground source heat pump system, regenerative electric boiler system and solar energy air conditioning system. Its energy saving benefit is 3.995 million yuan/year which is the main source of energy saving income in the park, with remarkable energy saving effect.

A multi-objective optimization operation strategy for ice-storage air-conditioning system based on improved firefly algorithm

2021 ◽  
pp. 014362442110455
Author(s):  
Xinwei Zhou ◽  
Junqi Yu ◽  
Wanhu Zhang ◽  
Anjun Zhao ◽  
Min Zhou
Keyword(s):  
Energy Saving ◽  
Economic Benefit ◽  
Air Conditioning ◽  
Firefly Algorithm ◽  
Optimal Operation ◽  
Ice Storage ◽  
Operation Strategy ◽  
Multi Objective Optimization ◽  
Air Conditioning System ◽  
Improved Firefly Algorithm

Reasonable distribution of cooling load between chiller and ice tank is the key to realize the economical and energy-saving operation of ice-storage air-conditioning (ISAC) system. A multi-objective optimization model based on improved firefly algorithm (IFA) was established in this study to fully exploit the energy-saving potential and economic benefit of the ISAC system. The proposed model took the partial load rate of each chiller and the cooling ratio of the ice tank as optimization variables, and the lowest energy consumption loss rate and the lowest operating cost of the ISAC system were calculated. Chaotic logic self-mapping was used to initialize population to avoid falling into local optimum, and Cauchy mutation was used to increase the population’s diversity to improve the algorithm’s global search ability. The experimental results show that compared with the operation strategy based on constant proportion, particle swarm optimization (PSO) algorithm, and firefly algorithm (FA), the optimal operation strategy based on IFA can achieve more significant energy-saving and economic benefits. Meanwhile, the convergence accuracy and stability of the algorithm are significantly improved. Practical application: The optimized operation strategy of the ice-storage air-conditioning system can reduce energy loss and operating costs. The traditional operation strategies have the problems of low optimization precision and poor optimization effect. Therefore, this study presents an optimal operation strategy based on IFA. The convergence accuracy and stability of the algorithm are increased after the algorithm is improved. The operation strategy can get the maximum energy-saving effect and economic benefit of the ISAC system.

scholarly journals Optimal operation strategy for subway HVAC system in transition seasons

2019 ◽  
Vol 111 ◽  
pp. 03006
Author(s):  
Yue Zhang ◽  
Xiaofeng Li ◽  
Bin Wang ◽  
Zheren Song
Keyword(s):  
Energy Saving ◽  
Calculation Method ◽  
Operation Mode ◽  
Water System ◽  
Optimal Operation ◽  
Operation Strategy ◽  
Ventilation Mode ◽  
Switching Condition ◽  
System Temperature ◽  
Switching Temperature

This paper mainly studied the operation strategy for subway VAC system during transition seasons. Two modes including WF-AC (Whole Fresh air- Air Conditioning) mode and B/E-V (Back/Exhausted fan-Ventilation) mode were selected based on energy saving principle. In order to decide the optimal operation mode, the calculation method of “switching temperature” was proposed. The main influencing factors of the switching condition include indoor cooling load, COP of the chilled-water-system, temperature difference of the supply air, efficiency of fan and the resistance of air duct. Also, the transfer temperature diagram is provided based on proposed calculation method, which is suitable for engineering use. The aim of this study is to regulate the operation mode and to promote energy saving in subway station.

Energy Saving for a Chinese Crude Oil Pipeline

2014 ◽  
Author(s):  
Yang Yu ◽  
Changchun Wu ◽  
Xiaokai Xing ◽  
Lili Zuo
Keyword(s):  
Energy Consumption ◽  
Crude Oil ◽  
Energy Saving ◽  
Heating Temperature ◽  
Physical Property ◽  
Optimal Operation ◽  
Oil Pipeline ◽  
Simulation And Optimization ◽  
Shengli Oilfield ◽  
Consumption Cost

The Dongying-Linyi Crude Oil Pipeline, transporting the crude oil from Shengli Oilfield to the outside, is one of the most important pipelines in East China. It is of great significance for saving energy, reducing emissions and improving the economy by optimizing pipeline operation. By analyzing the daily operation reports and monthly energy consumption reports, the energy consumption situation of the pipeline is revealed. Then the crude oil from Shengli Oilfield is collected, and its physical property is tested and researched. Based on the topological structure, the technological process and the operation philosophy of the pipeline, the mathematical models for the optimal operation and the energy consumption are built and the corresponding algorithm is introduced. With the models and the algorithms mentioned above, a computer software is developed for the operation simulation and optimization of the pipeline. Combining with practice, three energy-saving measures for the pipeline are analyzed, including reduction of oil heating temperature, operation matching with peak-valley electricity price and operation matching with the combination of flow rates in a planned operation period. In addition, these energy-saving measures are evaluated by the software with several examples. It turns out that: the first measure can considerably reduce the energy consumption and the energy consumption cost of the pipeline; the second could reduce the energy consumption cost of the pipeline a lot, while may make the energy consumption go higher a little; the third could slightly lower the equivalent energy consumption and the energy cost at the same time, but the effect of it is not obvious.

Optimal Operation of Multi-Chillers for Energy Saving Using a Multi-Fuzzy Inference System

2015 ◽  
Vol 793 ◽  
pp. 567-572 ◽  
Author(s):  
Elnazeer Hamid ◽  
Perumal Nallagownden ◽  
Nursyrizal bin Mohd Nor ◽  
Mohana Sundaram Muthuvalu
Keyword(s):  
Energy Saving ◽  
Fuzzy Inference System ◽  
Fuzzy Inference ◽  
Storage System ◽  
Load Ratio ◽  
Optimal Operation ◽  
Comfort Level ◽  
Inference System ◽  
Partial Load ◽  
Increasing Demand

The demand for cooling and air-conditioning is growing due to increasing demand for comfort level and cooling loads. The chilled-water systems (chillers) are one of the energy consuming appliances that consume large amount of energy in buildings. Under these circumstances, energy management system carried out to achieve the objective of using the minimum possible energy, while maintaining the comfort levels and the production rates in factories. This paper proposes an optimal operation for the chillers with the partial load ratio (PLR) and partial storage system (PSS) based on Fuzzy Inference System (FIS). Simulation results are presented to show the effectiveness of technique for energy saving of the Screw Chillers in large building as compared with ON-OFF control system.

scholarly journals Research on energy-saving operation control model of the multi-type configuration centrifugal pump system with single invert

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401770765 ◽  
Author(s):  
Yin Luo ◽  
Zhixiang Xiong ◽  
Hui Sun ◽  
Yihang Guo
Keyword(s):  
Energy Saving ◽  
Control Model ◽  
Optimal Operation ◽  
Control Circuit ◽  
Operation Condition ◽  
Pump System ◽  
Pump Station ◽  
Switch Control ◽  
Wide Range ◽  
The Impact

The multi-type pump configuration equipped with one invert scheme is suitable for the system to operate over a wide range of flow and head at different time periods. Its optimization may be the result of relatively low regulation capability. As a result, a synchronous switch control model was adopted to overcome this defect and to save further energy operation of the pump system. The hardware of synchronous switch control could be achieved by a simple logic control circuit which could be easily programmable and a phase discriminator control circuit which could eliminate the impact current. The software of synchronous switch control could be achieved by the minimum shaft power scheduling model group based on every type pump as variable-speed pump could calculate the optimal operation condition and the minimum switch number could ensure the optimal control regulation scheme. In conclusion, the single invert with synchronous switch control technology was used in an energy-saving reconstruction project of a circulating pump station; it could achieve the gain almost as same as the two invert scheme with the payback time almost the same as the single invert with pony pump scheme. Such is a particularly high quality and reasonable price scheme.

Sign in / Sign up

Export Citation Format

Share Document