Siemens manufactures industrial steam turbines for use in various fields of application. One of the turbines offered in its catalog is the SST-400, designed for power generation. Its technical data are: - 60 MW delivered power with a flow rate of 60 kg/s. - Inlet pressure 12.5 MPa - Inlet steam temperature: 500 °C - Outlet pressure: 30 kPa Determine the quality with which the steam leaves the turbine. Explicitly state the assumptions you have made to solve the problem.

You are designingla freezer that requires the production of R-134a with T = -30°C and a quality of 40%. The feed temperature, to the throttle, is 30°C. If the diameter of the tube exiting the throttle is 1 cm, calculate the following: a. Upstream diameter [for A(v2 ) = 0] b. Required upstream condition of the R-134a (pressure and state). c. Pressure drop, AP, across the throttle.

The rotor of an impulse turbine is 60 cm diameter and runs at 9,610 r.p.m. The nozzles are at 20° to the plane of the wheel, and the steam leaves them at 602 m/sec. The blades outlet angle are 30° and the friction factor is 0.8. Calculate the power developed per kg of steam per second and the diagram efficiency.

Provide solutions A penstock with a diameter of 4 ft and length of 225 ft carries water (γ = 62.4 lbf/ft3) through a 200 ft drop from a reservoir to a turbine. The penstock entrance is 10 ft below the water surface. The flow rate through the system is 500 cfs and water exits the turbine in a free jet with a velocity of 9 ft/s. The Darcy-Weisbach friction factor for the penstock is 0.01. Flow is turbulent and head losses at the entrances and exits of the penstock and turbine are negligible. (a) Draw the hydraulic grade line and energy grade line. Label transitions points with the height change using symbols (e.g. hL for pipe head loss) (b) Determine the head delivered to the turbine by the water in ft.(c) If the turbine and generator have a combined efficiency of 80%, determine the power in hp generated by the system.