(British Units) High pressure steam at 100 psia and 1000oF enters a turbine with

Question

(British Units) High pressure steam at 100 psia and 1000oF enters a turbine with a mass flow rate of 200 lbm/min. The inside diameter of the pipe is 12 inches. The steam exhausts from the turbine at 20 psia and 250oF, through a pipe with inside diameter 24 inches. The inlet stream to the turbine is 10 ft higher than the exit stream. Relevant thermo data is given below: T=1000oF, p=100 psia gives v (=1/?) = 8.659 ft3/lbm, h = 1529.2 Btu/lbm. T=250oF, p=20 psia gives v = 20.81 ft3/lbm, h = 1168.0 Btu/lbm. a) Calculate the kinetic and potential energy (per unit mass) entering and leaving the turbine. b) If the turbine is operating at steady state and is assumed well insulated (no heat transfer!), calculate the power (in Btu/hr) provided by the turbine. c) From the definition of enthalpy, calculate the specific internal energy (u), of the entering and leaving steam. Check your answers using steam tables.

Explanation / Answer

a] PE just comes from MgH, and you know the mass flow and change in height. KE you get from volumetric flow rate and diameter [give you velocity] and do the .5MV^2 thing.... b] energy balance time.... But just to check calculate Carnot efficiency while you are at it. c] U = H - PV

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