scholarly journals Overview of Thermal Hydraulic Optimization and Verification for the EU-DEMO HCPB BOP ICD Variant

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7894
Author(s):  
Wolfgang Hering ◽  
Evaldas Bubelis ◽  
Sara Perez-Martin ◽  
Maria-Victoria Bologa

When progressing from the International Thermonuclear Experimental Reactor (ITER) to the Demonstration Fusion Reactor (DEMO), a system for transferring plasma heat exhaust to a power conversion system is necessary for the so-called Balance of Plant (BOP). During the preconceptual phase of the EU-DEMO project, different BOP concepts were investigated in order to identify the main requirements and feasible architectures to achieve that goal in the most efficient way. This paper comprises the investigations performed during the DEMO preconceptual design phase (p-CDP) and compares the different variants. The main aspect was focused on the helium-cooled pebble bed (HCPB) breeding blanket (BB) concept. After all assessments were performed, the indirect coupled design (ICD) was chosen as the reference configuration for the DEMO HCPB BOP for further development and optimization. The ICD provides decoupling using a molten salt storage loop, which accumulates thermal power during plasma pulses that are released during dwell periods. The work is supported by simulations using design codes EBSILON and MATLAB/SIMULINK, providing the basis for the next design phase.

2018 ◽  
Vol 134 ◽  
pp. 79-91 ◽  
Author(s):  
José Ignacio Linares ◽  
Eva Arenas ◽  
Alexis Cantizano ◽  
José Porras ◽  
Beatriz Yolanda Moratilla ◽  
...  

Author(s):  
C. F. McDonald ◽  
C. P. C. Wong

There is increasing worldwide interest in fusion reactors as an energy source for electrical power generation. For such plants, which are projected for operation in the early decades of the 21st century, the choice of thermodynamic cycle for conversion of fusion reactor heat into electricity plays an important role in studies currently in the embryonic stage to evaluate performance, economics, safety, and operational features. A brief outline is given of some of the fusion reactor types currently under investigation. In this paper emphasis is placed on the utilization of a closed-cycle helium gas turbine power conversion system since its operational flexibility with regard to power and heat production and adaptability to economic dry cooling seem well suited to projected user energy needs of the future. The promise of an efficiency of over 50 percent (when operated in a binary cycle mode) makes the closed-cycle gas turbine an attractive power conversion system candidate as the goal of power production through a sustained fusion reaction in a confined plasma is realized. It is projected that the coupling of a closed-cycle gas turbine to a fusion reactor represents a challenging task for gas turbine engineers in the 21st century, and may be regarded as the ultimate application of the gas turbine prime-mover.


2011 ◽  
Vol 347-353 ◽  
pp. 498-503
Author(s):  
Wei Wang ◽  
Yu Ting Wu ◽  
Chong Fang Ma ◽  
Jian Yu

The amount of low temperature heat resources is very huge, efficient utilization that energy is very important issue for improving energy efficiency, saving energy and protecting environment. Due to the small available energy of low temperature heat source, how to improve thermodynamic efficiency is the key problem. In this paper, the thermodynamic model of low temperature thermal power conversion system based on organic Rankine cycle was described firstly. Turbine, single screw and piston expanders were briefly described. R123, R245fa and R134a were chose as working fluid because of quite different critical temperature. Based on this model, the influence of thermodynamic property of organic working fluid on the efficiency of low temperature thermal power conversion system was discussed. The calculating result showed that R123 is the best choice if no considering the impact of expander types and that R245fa is the best choice if considering the impact of expander. This conclusion indicated that it is very important to investigate the match relationship between working fluid and expander. Moreover, single screw expander was proved to be more suitable than turbine and piston expanders for low temperature heat power conversion system.


Author(s):  
Valentyna Bohatyrets ◽  
Liubov Melnychuk ◽  
Yaroslav Zoriy

This paper seeks to investigate sustainable cross-border cooperation (CBC) as a distinctive model of interstate collaboration, embedded in the neighboring borderland regions of two or more countries. The focus of the research revolves around the establishment and further development of geostrategic, economic, cultural and scientific capacity of the Ukrainian-Romanian partnership as a fundamental construct in ensuring and strengthening the stability, security and cooperation in Europe. This research highlights Ukraine’s aspirations to establish, develop and diversify bilateral good-neighborly relations with Romania both regionally and internationally. The main objective is to elucidate Ukraine-Romania cross-border cooperation initiatives, inasmuch Ukraine-Romania CBC has been stirring up considerable interest in terms of its inexhaustible historical, cultural and spiritual ties. Furthermore, the similarity of the neighboring states’ strategic orientations grounds the basis for development and enhancement of Ukraine-Romania cooperation. The authors used desk research and quantitative research to conclude that Ukraine-Romania CBC has the impact not only on the EU and on Ukraine multi-vector foreign policy, but it also has the longer-term global consequences. In the light of the current reality, the idea of introducing and reinforcing the importance of Cross-Border Cooperation (CBC) sounds quite topical and relevant. This research considers a number of explanations for Ukraine-Romania Cross-Border Cooperation as a key element of the EU policy towards its neighbors. Besides, the subject of the research is considered from different perspectives in order to show the diversity and complexity of the Ukraine-Romania relations in view of the fact that sharing common borders we are presumed to find common solutions. As the research has demonstrated, the Ukraine-Romania cross border cooperation is a pivotal factor of boosting geostrategic, economic, political and cultural development for each participant country, largely depending on the neighboring countries’ cohesion and convergence. Significantly, there is an even stronger emphasis on the fact that while sharing the same borders, the countries share common interests and aspirations for economic thriving, cultural exchange, diplomatic ties and security, guaranteed by a legal framework. The findings of this study have a number of important implications for further development and enhancement of Ukraine-Romania cooperation. Accordingly, the research shows how imperative are the benefits of Romania as a strategic partner for outlining top priorities of Ukraine’s foreign policy.


Sign in / Sign up

Export Citation Format

Share Document