Graphic determination of available energy-saving potential in a reservoir pumping application with variable-speed operation

2018 ◽  
Vol 12 (5) ◽  
pp. 1041-1051
Author(s):  
Tero Ahonen ◽  
Santeri Pöyhönen ◽  
Joni Siimesjärvi ◽  
Jukka Tolvanen
Author(s):  
О.Р. Кивчун ◽  
В.И. Гнатюк

В статье представлена методика определения Z2-потенциала энергосбережения объектов регионального электротехнического комплекса. Актуальность её разработки обоснована необходимостью повышения энергосбережения во всех отраслях региона для обеспечения экономической стабильности. Реализация этапов энергосбережения предполагает три направления: снижение и полезное использование энергетических потерь, модернизация и разработка электроустановок, использующих современные цифровые технологии и реализация научно обоснованных методов, моделей и методик, позволяющих существенно повысить энергоэффективность объектов региона. В рамках третьего направления была разработана третья методика. Теоретической основой методики является векторный ранговый анализ. Она включает в себя три расчётных блока: подготовки данных, расчёта добавочного ресурса и определения Z2-потенциала энергосбережения. Новизна методики заключается в реализации впервые разработанного математического аппарата на основе векторного рангового анализа, позволяющего при определении потенциала энергосбережения учесть внешнее управляющее воздействие вышестоящей энергосистемы. Это позволяет осуществить большую экономию денежных средств, которые расходуются на потери электроэнергии с целью модернизации электроустановок, внедрения новых технологий или премирование персонала. The article presents a methodology for determining the Z2-energy saving potential of objects of the regional electrical complex. The relevance of its development is justified by the need to increase energy conservation in all sectors of the region to ensure economic stability. The implementation of energy saving stages involves three directions: reduction and useful use of energy resources, modernization and development of electrical installations using modern digital technologies and the implementation of scientifically based methods, models and techniques that can significantly increase the energy efficiency of the region's facilities. Within the framework of the third direction, a third methodology was developed. The theoretical basis of the methodology is vector rank analysis. It includes three calculation blocks: data preparation, calculation of additional resource and determination of Z2-energy saving potential. The novelty of the technique lies in the implementation of a mathematical apparatus developed for the first time on the basis of vector rank analysis, which allows taking into account the external control influence of a higher power system when determining the energy saving potential. This makes it possible to save a lot of money that is spent on electricity losses in order to modernize electrical installations, introduce new technologies or award personnel.


2020 ◽  
Author(s):  
Zenghui Yang

Quantum mechanics/molecular mechanics (QM/MM) methods partition the system into active and environmental regions and treat them with different levels of theory, achieving accuracy and efficiency at the same time. Adaptive-partitioning (AP) QM/MM methods allow on-the-fly changes to the QM/MM partitioning of the system. Many of the available energy-based AP-QM/MM methods partition the system according to distances to pre-chosen centers of active regions. For such AP-QM/MM methods, I develop an adaptive-center (AC) method that allows on-the-fly determination of the centers of active regions according to general geometrical or potential-related criteria, extending the range of application of energy-based AP-QM/MM methods to systems where active regions may occur or vanish during the simulation.


Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 81
Author(s):  
Rongjiang Ma ◽  
Shen Yang ◽  
Xianlin Wang ◽  
Xi-Cheng Wang ◽  
Ming Shan ◽  
...  

Air-conditioning systems contribute the most to energy consumption among building equipment. Hence, energy saving for air-conditioning systems would be the essence of reducing building energy consumption. The conventional energy-saving diagnosis method through observation, test, and identification (OTI) has several drawbacks such as time consumption and narrow focus. To overcome these problems, this study proposed a systematic method for energy-saving diagnosis in air-conditioning systems based on data mining. The method mainly includes seven steps: (1) data collection, (2) data preprocessing, (3) recognition of variable-speed equipment, (4) recognition of system operation mode, (5) regression analysis of energy consumption data, (6) constraints analysis of system running, and (7) energy-saving potential analysis. A case study with a complicated air-conditioning system coupled with an ice storage system demonstrated the effectiveness of the proposed method. Compared with the traditional OTI method, the data-mining-based method can provide a more comprehensive analysis of energy-saving potential with less time cost, although it strongly relies on data quality in all steps and lacks flexibility for diagnosing specific equipment for energy-saving potential analysis. The results can deepen the understanding of the operating data characteristics of air-conditioning systems.


2021 ◽  
Vol 293 ◽  
pp. 116854
Author(s):  
Yunyang Ye ◽  
Yan Chen ◽  
Jian Zhang ◽  
Zhihong Pang ◽  
Zheng O’Neill ◽  
...  

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