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Full-Text Articles in Mechanical Engineering
The Role Of Transport Phenomena In The Direct Oxidation Of Solid Fuels, Charles J. Banas
The Role Of Transport Phenomena In The Direct Oxidation Of Solid Fuels, Charles J. Banas
Master's Theses
Direct carbon fuel cells have shown promise for stationary power generation by utilizing the direct oxidation of a solid carbon fuel source at the anode. In laboratory settings, researchers have reported up to 300mA/cm2 of current density from these cells types which suffer from mass transport losses. This paper studies the surface properties of the solid fuel source, and describes the process of CO2 evolution through an analogy to pool boiling. In nucleate boiling (a subset of pool boiling) vapor bubbles grow from nucleation sites where gas are trapped in micro-cavities on the surface. Carbon surfaces possess these same features, …
Evaluation Of Cathode Materials For Low Temperature (500-700c) Solid Oxide Fuel Cells, Alexander M. Lassman
Evaluation Of Cathode Materials For Low Temperature (500-700c) Solid Oxide Fuel Cells, Alexander M. Lassman
Master's Theses
Solid oxide fuel cells (SOFC) have gained a great deal of interest, due to their potential for high efficiency power generation and ability to utilize hydrogen fuel, as well as various hydrocarbon-based fuels. A recent trend in SOFC development has been towards lower operating temperatures (500-700°C), which can substantially reduce the cost and complexity of the system. This thesis presents an investigation into state of the art Ba- and La- based cathode materials for use in low temperature (500-700°C) solid oxide fuel cells.
Synthesis of A-site deficient [A=0.97] Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) was …
Applied Control Strategies At A Cogeneration Plant, Joseph William Burns
Applied Control Strategies At A Cogeneration Plant, Joseph William Burns
Master's Theses
The purpose of this paper is to demonstrate the effectiveness of “classical strategies for dynamic control” on authentic cogeneration processes. These strategies are applied to several processes at the University of Connecticut’s cogeneration plant. Case studies of their applications are presented in this paper. Strategies that are applied include the following:
1) The classical SISO feedback structure
2) The First Order Plus Dead Time (FOPDT) process model
3) The Internal Model Control (IMC) correlations for PI controller tuning
4) Static feed forward with feedback trim
5) Cascade Control