Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation and vapor barrier, endothermic chemical reactions, and (most notably) fuel reforming. Both fuel reformers and combustors will be of a miniature design relying on embedded catalysts for promoting chemical reactions at moderate temperatures (350–7501C). Many potential configurations exist depending on the application and constraints on the design. Microchannel arrays are a potential configuration; mesh and post architecture is another to achieve the desired surface area and small diffusional lengths necessary. (more…)
Fuel cells are direct energy conversion devices that combine two reactants to produce electrical power. The reactants are typic ...
Mixing is a process where two or more liquids or gas phase components are brought together and combined to form a uniform compositi ...
Heat-actuated heat pumps are cooling systems requiring no electricity for operation. Rather, a heat source is used, avoiding the ne ...
Many characteristics of traditional engines make them attractive for use in power generation and propulsion technology. They tend t ...
The most fundamental process from an energy systems standpoint is heat transfer to (or from) a working fluid. This unit operation t ...
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Fuel cells are direct energy conversion devices that combine two reactants to produce electrical power. The reactants are typically a fuel such as hydrogen fuel cells, or methanol, and oxygen from the air. Fuel cells require an electrolyte capable of passing an ionic charge carrier across an electronic conduction barrier where the ions are driven by a concentration gradient. Fuel cells also need a catalytic-based anode and cathode for reactant preparation. For mesoscale/ microscale systems, fuel cells are best fabricated in thin film form. Depending on the desired power output of the system, the ‘‘footprint’’ may well be relatively large to supply the required power. (more…)
Fuel cells are typically classified according to type of electrolyte. While many varieties of fuel cells have been demonstrated ...
Polymer Electrolyte Fuel Cells have high-power density, rapid startup, and low-temperature operation (around 80 to 120 C), and ...
The fuel cell can trace its roots back to the 1800s when a Welsh-born, Oxford-educated barrister, Sir William Robert Grove, realize ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation ...
Numerous other parts are needed for a complete fuel cell engine suitable for motor vehicles. These auxiliary components include man ...
Mixing is a process where two or more liquids or gas phase components are brought together and combined to form a uniform composition. Both turbulent and diffusive processes are typically employed to achieve the mixing action. As the scale of the process is reduced, diffusion becomes dominant. Microtechnology mixers are designed to bring together individual components for mixing with the smallest diffusional scales possible. (more…)
The most fundamental process from an energy systems standpoint is heat transfer to (or from) a working fluid. This unit operation t ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation ...
Separation is a unit operation used in absorption heat pumps and chemical processing applications such as solvent extraction and pr ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensificat ...
Fabrication techniques developed for integrated circuit (IC) production have been refined to the extent of supporting a multi-b ...
