Lydesign

Fundamentals of Thermophotovoltaic Energy Conversion

This is a text book presenting the fundamentals of thermophotovoltaic(TPV) energy conversion suitable for an upper undergraduate or first year graduate course. In addition it can serve as a reference or design aid for engineers developing TPV systems. Each chapter includes a summary and concludes with a set of problems.The first chapter presents the electromagnetic theory and radiation transfer theory necessary to calculate the optical properties of the components in a TPV optical cavity. Using a simplified model, Chapter 2 develops expressions for the maximum efficiency and power density for an ideal TPV system. The next three chapters consider the three major components in a TPV system; the emitter, filter and photovoltaic(PV) array. Chapter 3 applies the electromagnetic theory and radiation transfer theory presented in Chapter 1 in the calculation of spectral emittance. From the spectral emittance the emitter efficiency is calculated. Chapter 4 discusses interference, plasma and resonant array filters plus an interference filter with an imbedded metallic layer, a combined interference-plasma filter and spectral control using a back surface reflector(BSR) on the PV array. The theory necessary to calculate the optical properties of these filters is presented. Chapter 5 presents the fundamentals of semiconductor PV cells. Using transport equations calculation of the current-voltage relation for a PV cell is carried out. Quantum efficiency, spectral response and the electrical equivalent circuit for a PV cell are introduced so that the PV cell efficiency and power output can be calculated.The final three chapters of the book consider the combination of the emitter, filter and PV array that make up the optical cavity of a TPV system. Chapter 6 applies radiation transfer theory to calculate the cavity efficiency of planar and cylindrical optical cavities. Also introduced in Chapter 6 are the overall TPV efficiency, thermal efficiency and PV efficiency. Leakage of radiation out of the optical cavity results in a significant loss in TPV efficiency. Chapter 7 considers that topic. The final chapter presents a model for a planar TPV system.Six appendices present background information necessary to carry out theoretical developments in the text. Two of the appendices include Mathematica programs for the spectral optical properties of multi-layer interference filters and a planar TPV system. Software is included for downloading all the programs within the book. - First text written on thermophotovoltaic(TPV) energy conversion - Includes all the necessary theory to calculate TPV system performance - Author has been doing TPV energy conversion research since 1980's - Emphasizes the fundamentals of TPV energy conversion - Includes a summary and problem set at the end of each chapter - Includes Mathematica programs for calculating optical properties of interference filters and planar TPV system performance solution software

Dimensions. Journal of Architectural Knowledge

»Dimensions. Journal of Architectural Knowledge« is an academic journal in, on, and from the discipline of architecture, addressing the creation, constitution, and transmission of architectural knowledge. It explores methods genuine to the discipline and architectural modes of interdisciplinary methodological adaptions. Processes, procedures, and results of knowledge creation and practice are esteemed coequally, with particular attention to the architectural design and epistemologies of aesthetic practice and research. Issue 08/2024 discusses how multidimensional and diverse forms of thinking, designing, and building disrupt and challenge existing paradigms in the field of architecture in times of multiple struggles – characterised by inequality, conflicts, and exploitation of space. How do these changes impact architecture as a profession, practice, and discipline? How do spatial practitioners contribute to a more just spatial production including various voices and encouraging resource-saving urban practices? Referring to Audre Lorde we ask: »Are we doing the work?« This issue features contributions reflecting on collaborative practices, research, and diverse forms of architectural knowledge in activism, the building of networks, and alliances.

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