TRANSWAT (LLI-533) Mid-term Workshop

Povilas Mačiulis doctoral thesis defense

Author, Institution: Povilas Mačiulis, Lithuanian Energy Institute

Dissertation title: Assessment of the measures promoting the use of renewable energy sources in the transport sector

Science area, field of science: Social Sciences, Economics – S004

Defense of the dissertation: 2021-04-16, 10:00 a.m., Lithuanian Energy Institute (room – AK-330), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: Dr. Inga Konstantinavičiūtė (Lithuanian Energy Institute, Social Sciences, Economics – S004).

Scientific Advisor: Prof. Dr. Vaida Pilinkienė (Kaunas University of Technology, Social Sciences, Economics – S004).

Dissertation Defence Board of Economics Science Field:

The dissertation defence takes place online. Link to the online conference call:
https://liedm.zoom.us/j/91247693019?pwd=WVhYOTBKNXFMSStKSzd3eDR4aGljdz09

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas), and Lithuania Energy Institute (Breslaujos str. 3, Kaunas)

Annotation:
To reduce emissions, it is necessary to replace conventional transport sector vehicles with internal combustion engines with alternative technologies driven on renewable energy sources (RES). Despite the environmental benefits of clean cars, the existing technical and economic barriers prevent their mass development. To raise the competitiveness and popularity of clean vehicles among consumers, the appropriate promotion policy instruments need to be applied. Despite the growing interest in the issues of promoting the use of RES-driven vehicles, scientific literature still lacks an empirically-based evaluation methodology that would allow to comprehensively evaluate particular promotion measures. Thus, the main purpose of the research in this dissertation is to develop the model and the methodology for evaluating RES-driven vehicle promotion measures that would allow to identify most relevant measures with consideration of consumer preferences, measure implementation costs, feasibility and efficiency. For evaluating promotion measure feasibility, efficiency and estimating evaluation criteria weights, the method of expert evaluation was employed. Consumer preferences were evaluated by employing discrete selection models. Promotion measure implementation costs were estimated by three electric vehicle market development scenarios. Aggregation of all the research indicators based on multi-criteria evaluation method allowed to identify the most relevant promotion measures in the case of Lithuania.

CYSENI 2021

🟢 DESCRIPTION
We invite you to participate in the 17th International Conference of Young Scientists on Energy and Natural Sciences Issues (CYSENI 2021). This year, due to global COVID-19 pandemic, the conference will be held online, from May 24 to 28, 2021.
CYSENI is an annual event aimed at young researchers and professionals from Europe and worldwide working in the fields of Energy, Physical and Environmental sciences. CYSENI aims to provide a free and well-established platform to undergraduate, MSc, PhD students, postdoc, entrant engineers and other young scientists to present their latest research, develop their skills, make new contacts and forge durable scientific relationships.

Participation in the conference is free of charge!

Programme: https://cyseni.com/programme/
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Organizers:
Lithuanian Energy Institute
www.lei.lt/en
Lithuanian Research Centre for Agriculture and Forestry
www.lammc.lt/en
Center for Physical Sciences and Technology
www.ftmc.lt/en
RTO Lithuania
www.rtolithuania.com/

IAEE Webinars: Decarbonisation of the Economy: Modelling and Planning Challenges

Audrius Graževičius doctoral thesis defense

Author, Institution: Audrius Graževičius, Lithuanian Energy Institute

Dissertation title: Numerical investigation of two-component two-phase natural convection and thermal stratification phenomena

Science area, field of science: Technological Sciences – Energy and Power Engineering, T006

Defense of the dissertation: 2020-08-26, 14:00, Lithuanian Energy Institute (room – AK-330 a.), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: Assoc. Prof. Dr. Habil. Algirdas Kaliatka (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering – T006)

Dissertation Defence Board of Energetics and Power Engineering Science Field:

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas, Lithuania) and in Lithuanian Energy Institute (Breslaujos St. 3, Kaunas, Lithuania).

Annotation:
It is important to understand processes, to predict steady or changing situations, and to manage potential or unexpected accidents when a powerful industrial unit is operated. Passive cooling systems that do not require an external power source during critical situations and accidents are being installed or designed in advanced industrial facilities in order to prevent or minimise the potential consequences of such accidents. This issue is particularly relevant in nuclear power plants because the potential consequences of accidents at these facilities can be severe. Natural convection and thermal stratification phenomena, which occur in cooling pools of passive systems are closely interrelated and their behavior affects the safety of the installations. Currently, there is a growing interest in modelling of these phenomena using CFD (Computational Fluid Dynamics) software, however, these phenomena are modelled using a lot of simplifications. There is no detailed and complex modelling methodology for these phenomena available today or it has not been published.

This dissertation introduces the methodology for modelling of two-component two-phase natural convection and thermal stratification phenomena in a cooling pool using CFD software. The methodology can be applied for modelling of these phenomena, which occurs in power or industrial installations (in the cooling pool of the passive system, in the spent nuclear fuel pool, in the nuclear or chemical reactor, etc.), facility or installation safety assessment, development of accident management methodology, etc.

Dovilė Gimžauskaitė doctoral thesis defense

Author, Institution: Dovilė Gimžauskaitė, Lithuanian Energy Institute

Dissertation title: Research of the Conversion of Liquid and Solid Wastes Using Thermal Plasma Technology

Science area, field of science: Technological Sciences – Energy and Power Engineering, T006

Defense of the dissertation: 2020-08-28, 10:00 a.m., Lithuanian Energy Institute (room – AK-330 a.), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: Dr. Vitas Valinčius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering – T006)

Dissertation Defense Board of Energetics and Power Engineering Science Field:

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas, Lithuania) and at Lithuanian Energy Institute (Breslaujos St. 3, Kaunas, Lithuania).

Annotation
The amount of waste generation is continuously increasing, and the ways are being sought to deal with it most sustainably and efficiently. Currently, waste management is based on the principle of the waste hierarchy, which is composed of five stages: prevention, reuse, recycle, recovery, and disposal. Despite many efforts to accomplish the first three stages, still, there is a part of the wastes that can only be handled by recovery (e.g. waste-to-energy conversion (WtE)). Among WtE conversion technologies, plasma technologies are considered as a viable solution for waste management in the future. However, in seeking to widen the use of such technologies, further experimental studies are needed. Thus, this work aimed to investigate the plasma conversion processes of liquid (crude glycerol) and solid (diesel-contaminated soil) wastes, determining the optimal performing conditions for the crude glycerol conversion process, and evaluating diesel fuel removal efficiency from the soil.

The experimental research of crude glycerol conversion using thermal plasma allowed determining the influence of the gasifying agent type and flow rate to the crude glycerol conversion process. Also, the efficiency of proposed plasma-based technology was evaluated by calculating the mass and energy balance of the plasma system during the glycerol conversion process.
Experimental research studies on the remediation of diesel fuel contaminated soil allowed evaluating the suitability of thermal plasma to treat petroleum-hydrocarbons polluted soil. The main emphasis was placed on the determination of soil remediation process dependence on plasma forming gas and contaminant concentration.

Remigijus Janulionis doctoral thesis defense

Author, Institution: Remigijus Janulionis, Lithuanian Energy Institute

Dissertation title: Numerical Research of Fracture of Nuclear Energy Objects Construction Elements with Hydrides under Thermal Impact

Science area, field of science: Technological Sciences – Energy and Power Engineering, T006

Defense of the dissertation: 2020-06-17, 14:00, Lithuanian Energy Institute (room – AK-330 a.), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: Dr. Gintautas Dundulis (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)

Dissertation Defense Board of Energetics and Power Engineering Science Field:

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio st. 20, Kaunas) and the Lithuanian Energy Institute (Breslaujos st. 3, Kaunas, Lithuania).

Annotation:
Nuclear reactors fuel claddings and fuel channels are made of zirconium alloys, which, in addition to the ageing mechanisms of other metals, are also susceptive to hydrogen absorption and it following delayed hydride cracking mechanisms. Usually, the effects of the ageing of materials are evaluated by laboratory tests. As fuel claddings and fuel channels are the protective measures to prevent the release of radioactive fission products into the environment, their experimental studies are complex, difficult, and costly. Therefore, alternative methods are needed for the material ageing assessment. The aim of this research is to determine the fracture toughness of nuclear energy objects construction elements made of zirconium alloy with hydrides under thermal impact using the developed numerical method.

To achieve the aim of the research a new numerical simulation methodology has been proposed, which allows numerical determination of fracture toughness of zirconium alloys at different hydrogen concentrations. Also, the crack growth determination methods were supplemented with the proposed and validated polynomial equation. By applying this methodology for the fuel channels and fuel claddings it is possible to predict a change in their properties due to the hydrogen absorption mechanism during the operation of a reactor or the storage of spent nuclear fuel. Therefore, using this methodology, it is possible to improve the design of fuel claddings and spent fuel storage procedures.

Webinar: Post-COVID Green Deal Technology-Powered Recovery in Europe

We would like to invite you to the webinar: Post-COVID Green Deal Technology-Powered Recovery in Europe, which will take place on the 2nd of June 2020, 14-15 CET.

How COVID-19 pandemic will affect European Green Deal? Will EU recovery be sustainable and technology-powered? On these and other urgent issues we will speak with three guest speakers:

Virginijus Sinkevičius, EU Commissioner for the Environment, Oceans and Fisheries
Prof. Antti Vasara, President of EARTO, President & CEO of VTT Technical Research Centre of Finland
Prof. Gintaras Valušis, EARTO and RTO Lithuania board member, Director of Center for Physical Sciences and Technology, Lithuania

If you are interested, do not hesitate to register. The webinar will be organised via Zoom with a total amount of 100 people.
You can do that by following this link: https://tinyurl.com/greendealwebinar.

The webinar is organised jointly by Research and Technology Organisation Association Lithuania (RTO Lithuania) and The Lithuanian Research Development and Innovation Liaison Office in Brussels (LINO).

Paulius Vilkinis doctoral thesis defense

Author, Institution: Paulius Vilkinis, Lithuanian Energy Institute

Dissertation title: Investigation of flow dynamics and structure in channels with structured surfaces

Science area, field of science: Technological Sciences – Energy and Power Engineering, T006

Defense of the dissertation: 2020-01-24, 13:00, Lithuanian Energy Institute (Meeting Hall – AK-202 a.), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: – Dr. Nerijus Pedišius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)

Dissertation Defence Board of Energetics and Power Engineering Science Field:

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas) and at Lithuanian Energy Institute (Breslaujos   g. 3, Kaunas).

Annotation:
Flow separation phenomena have a considerable impact on mass, momentum, and heat transfer processes in flowing fluids and their mixing processes. These phenomena are the main reason why separated flow remains a research object in engineering. Furthermore, they are a source for a deeper understanding of the internal mechanism of vortex formation, interaction, and disintegration. The aim of this work is to investigate fluid flow dynamics and structure in channels with abrupt cross-section changes and to determine the characteristics of recirculating flow depending on flow regime and channel geometrical parameters using experimental and numerical approaches.

By this work the knowledge of recirculation zone structure and length dynamics for different cavity types, depending on cavity geometrical parameters (H/h and L/h1) is improved. Also, determined dependencies and patterns of physical recirculation zone parameters for laminar and turbulent flow regimes. Revealed causes of the effect of channel expansion ratio (H/h) and Re for dynamics of recirculation zone length, which helps to explain the scattering of other authors’ results and suggest possible scaling for laminar and turbulent flow regimes.

Results of this work are significant for a large number of engineering problems where flow separation is induced by abrupt changes of channel cross-section, which can be analyzed as flows over cavities in a channel.

Andrius Tidikas doctoral thesis defense

Author, Institution: Andrius Tidikas, Lithuanian Energy Institute

Dissertation title: Investigation of neutron transport and radioactive processes in Nuclear Fusion devices

Science area, field of science: Technological Sciences – Energy and Power Engineering, T006

Defense of the dissertation: 2019-09-03, 13:00, Lithuanian Energy Institute (Meeting Hall – AK-202 a.), Breslaujos st. 3, Kaunas, Lithuania.

Scientific Supervisor: – Dr. Gediminas Stankūnas (Lithuanian Energy Institute, Technological Sciences – Energetics and Power Engineering, T006)

Dissertation Defense Board of Energetics and Power Engineering Science Field:

The doctoral dissertation is available on the internet and at the library of Kaunas University of Technology (K. Donelaičio st. 20, Kaunas) and Lithuanian Energy Institute (Breslaujos st. 3, Kaunas, Lithuania).

Annotation:
Increasing demand for sustainable energy source with low carbon emissions drives the research interest in nuclear fusion. During the operation of nuclear fusion device, structural and functional materials are exposed to tangible neutron irradiation. Neutron interactions with matter result not only in heat transfer but also in a significant material activation which leads to the production of radioactive nuclides. These radionuclides are the source of ionizing radiation and decay heat affecting nuclear fusion device operation, decommissioning and waste management. In this work neutron transport and material activation calculations were employed in order to assess the production of radionuclides in nuclear fusion devices suitable for electricity production.
Investigation of material activation was performed by combining calculation results for three nuclear fusion relevant research devices: Joint European Torus, Fusion Materials Irradiation Facility – Demo Oriented Neutron Source and Demonstration Power Station. Differences and dependences in activities, dose rates and decay heats due to different fusion reactions, irradiation scenarios, material compositions, volumetric vacuum vessel and fusion power changes were obtained with application of extended material activation calculation methodology. A novel sensitivity analysis based method was also suggested for neutron spectra evaluation. It is expected that this conducted research will result in betterment of nuclear fusion experimental and technological development.

Summary of doctoral thesis