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Jafar Jafari-Asl, Seyed Arman Hashemi Monfared and Soroush Abolfathi
This study investigates the optimal and safe operation of pumping stations in water distribution systems (WDSs) with the aim of reducing the environmental footprint of water conveyance processes. We introduced the nonlinear chaotic honey badger algorithm...
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Linmin Shang, Jingwei Cao, Xin Jia, Shengrui Yang, Sainan Li, Lei Wang, Zhengwei Wang and Xiaobing Liu
The pumped storage power station plays a vital role in modern power systems, where the key component is the pump turbine. Variable-speed operation can improve the operating efficiency of the pump turbine and increase the operating efficiency under turbin...
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Rongsheng Zhu, Wenhao Shi, Gongchang Gan, Huairui Li, Dawei Yang, Yuchen Duan and Qiang Fu
To investigate the transient characteristics of high-speed axial flow water-jet pumps during start-up and emergency acceleration as well as to analyze how different accelerations affect the performance of internal flow, the k?? turbulence model of the SS...
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Tae-Youl Jeon and Byung-Gun Jung
Since the variable-speed seawater pump and the three-way valve of a ship?s central cooling system are forms of feedback from the same output signal, these controllers may cause interference when they are not coordinated. Therefore, studying an efficient ...
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Tae-Youl Jeon, Chang-Min Lee and Jae-Jung Hur
Large ships adopt a central fresh water-cooling system that indirectly cools waste heat with seawater to discharge the ship's waste heat out of the ship. Such a central fresh water-cooling system is essential for future electric powered ships. Since 2010...
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Jaime Sieres, Ignacio Ortega, Fernando Cerdeira, Estrella Álvarez and José M. Santos
The seasonal performance of a heat pump indicates its average performance during the heating and/or cooling season, taking into account the different energy demands and their variability over time. Several European and international regulations and polic...
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Chang-Min Lee, Tae-Youl Jeon, Byung-Gun Jung and Young-Chan Lee
Since fuel prices account for approximately 40% of a ship?s operating costs, shipping companies worldwide have made significant efforts to save energy on board such as introducing new technologies or machine operation methods. Many ship operators have ad...
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Efthimios G. Pariotis, Theodoros C. Zannis and John S. Katsanis
The present study describes a model-based approach for the assessment of central cooling retrofit solutions using variable speed drive (VSD) seawater (SW) pumps in marine applications. There are two main innovative features of the proposed methodology. T...
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Guopeng Zhao and Jiyun Ren
The doubly-fed variable-speed pumped storage (DFVSPS) is an effective method to balance the fluctuation of renewable energy generation and is an important means of frequency and voltage regulation of a power grid. Firstly, this paper introduces the struc...
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Waste heat that is available in the flue gas of power plant stacks is a potential source of useful thermal power. In reclaiming and utilizing this waste heat without compromising plant efficiency, stacks usually need to be equipped with forced-draught fa...
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