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 7 separator. The resulting steam is directed to two impulse turbines which form the second stage of the hybrid system. The exhaust from the turbines is directed t o the condenser.’ The Lysholm power system is f u l l y instrumented t o provide performance data for the Lysholm engine, t o monitor the health of the system and to help in controlling the system. The primary instrunentation allows determination of operating conditions and calculation of performance parameters for the engine. A calorimeter on the steam supply line allows determination of the steam enthalpy. A thermocouple on the pressurized , heated water line allows an accurate estimate of the hot water enthalpy. The flow rates of water and steam are determined by measuring the differential pressure across square edged orifice plates with flange taps. A second, interchangeable, orifice plate for the water line was recently designed and aanufactured. This plate, having a maller orifice, allows more precise measurement of the low water flow rates in high quality mixtures. A thermocouple measures the saturation temperature of the steam at the engine inlet to fix the state of the simulated geotherinal fluid. A thermocouple in the exhaust line measures the saturation temperatures of the exhausting fluid. This allows determination of the exit state for ideal isentropic expansion in the engine. The power produced by the engine is measured by the coinbination of a tachometer and torque sensor. The tachometer consists of a 60-tooth gear on the brake shaft and a magnetic pickup. The torque sensor uses resistance wire strain gages on the shaft with rotary transformers to transnit signals to and from the shaft. A l l the primary instrunrentation is connected to an Autodata Nine located i n the control rooaCFigure 31. The thermocouples and power measurement devices send electrical signals to the control room. The flow measurement signals are transmitted pnematically. The Autodata scans 311 channels simultaneously, 3llowing quick accurate measurment and recording of all data when the desired operating conditions are reached. Other data \

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