Steam at a pressure of 3 MN/m2, at a temperature of 250°C and flowing at a rate of 3 kg/s is throttled to a pressure of 900 kN/m2. It is then mixed with steam at a pressure of 900 N/m2 and at a dryness fraction of 0.8. which has a flow rate of 6kg/s. Determine i)   The condition of the resulting steam mixture                   ii)   The internal diameter of the pipe to convey the steam at a pressure of 2 MN/m2 if the velocity of the steam is limited to 18 m/s.

5.An ideal gas flows into a channel with an average velocity of 10 m/s from an inlet with 苏日 area of 1 m2. The gas is at 1000 kPa and 500°C. Determine the mass flow rate of the gas. The gas constant is 0.287 kPa.m^3/kg.K. ( )

The remaining wet steam exits the turbine at 11.5 kPa with a quality of 0.88. Determine the minimum pipe diameters required to restrict the maximum inlet velocity to 50 m/s, the maximum extraction velocities each to 75 m/s, and the turbine outlet velocity to 130 m/s. Consider a steam turbine in which steam enters at 10.45 MPa and 780 K with a flow rate of 38.739 kg/s. As shown in the sketch, a portion of the steam is extracted from the turbine after partial expansion at three different locations. The extracted steam is then led to various heat exchangers. The mass flow rates and the temperatures and pressures at each extraction point are given in the following table: Inlet Steam turbine Extraction Location rin(kg/s) P (MPa) T(K) 1 23 4.343 3.054 620 4.345 0.332 482 Extraction 3. 2.871 0.136 x= 0.949 locations Exit 123