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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PERFOFtMANCE MEASURES AND CALCULATIOi4.S 22 Patrn is the atmospheric pressurs. The inlet enthalpy is then given by: h l = (m,hw + mshs) / (m, + m,) Wnere: hl is the inlet enthalpy mw is the hot water flow rate ms is the steam flow rate The inlet state is defined by tesperature. The properties at the the steaq table: Where: x1 is s1 is vi is Ti is the inlet enthalpy and inlet are determined using Table Call] Table Call1 Table Call] x i = x(T1, h i ) si = s(T1, h i ) v1 = v(T1, h i ) the inlet quality the inlet entropy the inlet specific volume the inlet tesperature [Steam [Stean [Steam Inlet pressure, exhsustepressure and pressure ratio are also obtained using the stean table: P1 = P(T1) [Steaa Table Call1 P2 = P(T2) [Steam Table Calll PRESSUilE RATIO = Pi / P2 Where: Pi is the inlet pressure P2 is the exhaust pressure The leakage rate frm the inlet chanber is determined by subtracting the theoretical mass flow rate, assuming no leakage, from the total mass flow rate. The theoretical flow rate is a function of engine geometry, engine speed and inlet density. Cardner-Denver, the manufacturer of the engine, has stated that t h e intake volume is 13.8 cubic inches per revolution[93. The theoretical volume flow r a t e is then given by: Vf =ViN dhere: Vf is the volume flow rate ‘Vi is the intake volume per revolution N is the engine speed \

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