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EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER

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EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER ( empirical-modeling-lysholm-helical-screw-expander )

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SYSTEM DESCRIPTION 6 System Description The Lysholm engine being tested at U.I:. Berkeley is set up to allow powsr generation in simulation of conditions at a geothermal site[Figure 21. Conversion to hybrid operation requires no nodifications to the system. Instrumentation of the system allows determination of performance parameters and safe operation of the engine. Saturated steam a t approximately 120 psia is drawn from the carnpus heating system and directed to the Lysholm inlet. The steam supply is also used to heat pressurized industrial water in an eight pass shell and tube type heat exchanger. The flow rates of both water and steam are controlled by pneumatic control valves. Almost any quality of stean can be produced by the mixture of the two flows. The water is injected into the stean just before the engine inlet. An injector allowing the use of variable nDzzle size has recently been installed to allow investigation of the effects of different hold-up ratios. The Lysholm engine is mounted with the rotor axes horizontal and the Inlet and exhaust lines pointed downward. Life support systems for the engine include an oil supply system for the journal bearings, an a i r seal and a water seal. An adjustable load on the engine is provided by an eddy current dynamoiieter (brake) powered by a DC power supply. The shaft power from the engine is transmitted to the brake by a 3 to 1 reduction Cilmer belt. The exhaust from the engine is directed through piping to a shell and tube type condenser. The condensed fluid is punped from the condenser by a centrifugal pmp. Subatmospheric exhaust pressures can be maintained by the pump and a steam powered air ejector system used to remove non-condensible gases from the condenser. When the Lysholm engine is used as the first stage of the hybrid system, its exhaust is directed to a New Zealand type centrifugal separator. The liquid phase is discarded from the \

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EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER

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