Borehole Thermal Energy Storage Systems for Storage of Industrial Excess Heat : Performance Evaluation and Modelling

Abstract

I want to thank Leif Rydell at Xylem Water Solutions and Manufacturing AB for valuable discussions and for assistance in data collection, making the execution of this project possible. Lastly, I want to thank friends and family for being around. Thesis outline Chapter 1 introduces the overall research field and motivates the research of the thesis. The chapter presents the thesis research questions, the research scope and its limitations, and coauthor statements of the publications on which the thesis is based. Chapter 2 starts with a brief review of the excess heat potential for delivery to the district heating network for Sweden and the EU27 countries, followed by a short description of some prominent methods for long-term storage of thermal energy. The chapter then ends with a more detailed overview on BTES system technique and BTES systems reported in the literature. Chapter 3 presents the research design and the methods used to conduct the research. Chapter 4 describes the industrial site and BTES system used as study object for the research. Chapter 5 outlines input data and assumptions for conducted model validation and parameterization. Chapter 6 summarizes results from appended papers relevant to the thesis research questions. Chapter 7 presents main conclusions and findings from the research and final thoughts are given. The chapter ends with suggestions for future research.

Control of p-type conductivity at AlN surfaces by carbon doping

“…13,14) This increase hampers p-type conductivity in Al-rich AlGaN. In fact, the resistivities of p-type AlGaN drastically increase when the Al composition exceeds 0.4, [13][14][15][16][17][18][19][20][21] unless carrier hopping at the impurity level brings conductivity. p-Type conductivity control, [22][23][24] including polarization doping, has been studied to overcome the high ionization energy of the Mg acceptor.…”