Power plants – Fluid within expansible chamber heated or cooled – Having means within the working chamber to effect the...
Patent
1998-03-09
2000-08-29
Denion, Thomas
Power plants
Fluid within expansible chamber heated or cooled
Having means within the working chamber to effect the...
60515, 60645, 60650, F01B 2900
Patent
active
061090352
ABSTRACT:
Incremental control of motion in the thermodynamic phase space of a heat engine, by modulating the piston speed to control the instantaneous rate of change of temperature relative to the instantaneous heat flow during each cycle. The modulation is independent of the overall operating speed, overcoming a basic flaw in the concept of quasistatic operation that thermal leakages cannot be diminished by merely reducing the speed, and would cause the efficiency of a real engine to also vanish in the limit. The modulation and control are envisaged for more precise execution of given thermodynamic cycles, asymptotic approach to the ideal thermodynamic cycles, and emulation of the cycles of other engines by real heat engines, as well as to mechanical and electrical transformers for assuring the maximum power factors at any operating speed by executing the analogous "Carnot cycles". Additionally, mechanical heat engines are shown to have equivalent electrical forms as inductive or capacitive engines, using magnetic or dielectric thermodynamic media, respectively, so that the control analysis and design are easily translated, in reverse, to analogous mechanical forms, and hybrid engines are described potentially combining the high power of mechanical heat engines with the direct conversion capabilities of the electrical forms, so that the electrical control embodiment is as such available at the highest power levels currently achieved only by gas (mechanical) heat engines.
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