High efficiency steam engine, steam expander and improved valves therefor
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United States of America Patent
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Apr 19, 2016
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N/A
app pub date -
Jun 26, 2012
filing date -
Mar 7, 2007
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Abstract
An engine having a Rankine cycle steam expander includes an engine cylinder, a cylinder head and a piston in which clearance is zero together with a negligible amount of compression, such that pressure in the clearance volume is as low as to approximate ambient pressure or condenser pressure existing at the end of a return stroke when the clearance is zero. These provisions for clearance and compression working together simultaneously provide a thermal efficiency which substantially exceeds all prior known Rankine operating cycles and is referred to as “zero clearance with zero compression”. The steam admission valve is raised slightly by the piston to establish a zero clearance whereupon a steam assist then moves the steam admission valve determinately and quickly to a fully open position.
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