Application of thermodynamic analysis for thermohydrodynamic loops systems

Karolis Januševičius

Doctoral dissertation

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Dissertation deals with problems of the thermohydrodynamic contours system, using the methods of applied thermodynamic analysis. The main research object is the energy services supply system, which ensure thermal comfort and provides energy services to the users of the building. The main aim of the dissertation is to develop methodologies for the evaluation of seasonal thermodynamic efficiency and for the processing and analysis of the generated indicators. Scope of the developed methods - research and engineering practice focuses on the development and improvement of sustainable energy systems. The dissertation also aims to reduce the gap between methods of applied thermodynamic analysis used in the research and engineering practice.

The aim of the work is to create a method for seasonally effective evaluation of the thermohydrodynamic system and to formulate a methodology for systematic increase of this size. To accomplish this, several main tasks are solved: identification of the application of the thermodynamic analysis, determination of the method for the thermodynamic seasonal efficiency (TSE), the identification of the level of detail required for modeling, and the creation of a TSE improvement methodology by eliminating critical interruptions.

The dissertation consists of an introduction, three chapters, summary in English, list of used literature and author's publications, and eleven appendices.

The introductory chapter discusses the research problem, the relevance of the work, describes the object of the research, formulates the aim and tasks of the work, describes the research methodology, the scientific novelty of the work, the practical significance of the work results, and the defended statements. At the end of the introduction the publications and reports published by the author of the dissertation and the structure of the dissertation are presented.

The first chapter is devoted to literature review and analysis. At the end of the chapter, conclusions are formulated and the tasks of the dissertation are refined.

The second chapter presents a thermodynamic seasonal efficiency method for calculating specific efficiency cases, and seasonal efficiency improvement methodology.

The third chapter provides an example of the analysis of the system under study illustrating the functionality of the seasonal efficiency determination and its improvement methodology.

The subject of the dissertation is published in 9 articles: 2 is in the collection of articles included in the list of Clarivate Analytics Web of Science, 1 in the conference materials listed in the Proceedings database, 6 in the magazine cited in the Inspec database, 3 in the reviewed international conference materials.

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145×205 mm
178 p.
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