Research of heat storage tank operation modes in cogeneration plant

Giedrė Streckienė

Doctoral dissertation

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The dissertation investigates typical operation modes of the heat storage tank in the small-scale cogeneration (CHP) plant, analyses formation of thermal stratification in such storage tank and presents the simulation of the stratification. The main aim of the dissertation is to investigate peculiarities of operation modes of heat storage tank in small-scale CHP plant, develop an algorithm allowing to choose the storage tank volume and present a model allowing determination of thermal stratification in the storage tank at any time of its operation.

The dissertation consists of Introduction, 4 chapters, Conclusions, References, List of scientific author’s publications on the subject of the dissertation and 2 Annexes.

The introduction reveals the investigated problem, importance of the thesis and the object of research and describes the purpose and tasks of the paper, research methodology, scientific novelty, the practical significance of results examined in the paper and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and defining the structure of the dissertation.

Chapter 1 revises literature review related to the operation and principles of thermal stratification, established in the heat storage tanks, application, determination of volume and optimisation methods of stratified heat stores in the CHP plants. Simulation methods of the heat storage tanks are discussed. Made review of research enables to identify the gap in the analysed field of research and form the tasks of the work.

Chapter 2 describes the used methodology to choose volume of the heat storage tank in the small-scale CHP plant and presents a model of the actual plant. There are presented methodologies of semi-analytical and numerical investigation to determine temperature distribution in the storage tank.

Chapter 3 presents results of search and analysis of economic heat storage volume and shows typical operation modes of the storage tank.

In Chapter 4 simulation of thermal stratification, using numerical and semianalytical models, is performed. Comparison of the simulation results and data of actual heat storage tank in the CHP plant is presented.

9 articles focusing on the subject of the discussed dissertation are published: one in the journal quoted by ISI Web of Science data base, two – in journal quoted by Inspec data base and six (one of them accepted for publishing) – in proceedings of international and national conferences.

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Imprint No:
160 p.
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