Method and means for controlling a flow through an expander
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United States of America Patent
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Nov 17, 2009
Grant Date -
Jul 19, 2007
app pub date -
Feb 3, 2005
filing date -
Feb 17, 2004
priority date (Note) -
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Abstract
A method and apparatus for controlling the flow of a working medium through an expansion device in a closed heating system which also includes a condenser, a pump and a boiler. The expansion device is a helical screw rotor expander that has an inlet port with an inlet line connected thereto, and an outlet port. The expansion device drives an energy producing device, such as a generator. The helical screw rotor expander has an intermediate pressure port between the inlet port and the outlet port, and a branch line is connected between the intermediate pressure port and a branching point in the inlet line. A valve is in the branch line. The flow of working medium through the valve to the intermediate pressure port is controlled as a function of a state parameter.
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