Chapter 6, Problem 6.111P

4.) Steam with a flow rate of 3000 lbm/hr enters an adiabatic nozzle at 200 psia, 600 ft/min,with a specific volume of 2.36 ft3/lbm, and a specific internal energy of 122.7 Btu/lbm. Theexit conditions are p = 20 psia, specific volume = 17.6 ft3/lbm, and internal energy = 973Btu/lbm. Determine the exit velocity.

4.) Steam with a flow rate of 3000 Ilb„/hr enters an adiabatic nozzle at 200 psia, 600 ft/min, with a specific volume of 2.36 ft’/lbm, and a specific internal energy of 122.7 Btu/lbm. The exit conditions are p = 20 psia, specific volume = 17.6 ft’/lbm, and internal energy = 973 Btu/lbm. Determine the exit velocity.

Q4. A steam power plant is based on an Ideal Rankine cycle operating between pressures of 50 and 5 bar. The superheated cycle is heated to an upper temperature of 350°C and the specific volume of saturated liquid at 5 bar is v= 0.001 m/kg. (a) . Sketch the components of the steam power plant. Label the inlet to the pump as "state 1", the outlet to the pump as "state 2" and so on. ii. Sketch the ideal Rankine cycle on a T-s diagram with labels corresponding to your sketch in a)i). ii. Sketch the ideal Rankine cycle on a P-h diagram with labels corresponding to your sketch in a)i). (b) i. Calculate the specific enthalpy at the inlet to the pump (h:), (kl/kg). ii. Calculate the specific enthalpy after the pump (ha), (kJ/kg). iii. Calculate the specific enthalpy after the boiler (ha), (kJ/kg). iv. Calculate the dryness of steam after the turbine (x4). V. Calculate the specific enthalpy after the turbine (ha), (kJ/kg). vi. Calculate the heat transfer of the Rankine cycle per unit mass…

Superheated steam (s. fig. C) at a pressure of 300 bar and a temperature of 550 ℃ enters a turbine made up of two stages. Steam exits the first stage of the turbine at 35 bar and gets reheated at a constant pressure at 550 ℃. Each stage of the turbine has an isentropic efficiency of 80%. The isentropic efficiency of the pump is 85%. The pressure of the condenser is 10 kPa. (a) Sketch the cycle in a T-s diagram and calculate the enthalpy at each point of the cycle. (b) Calculate the flow rate of the working fluid if the power output of the turbine is 100 MW. (c) Calculate the thermal efficiency of the cycle. (d) Double check the result for the heat rejected in the condenser.

2. A certain gas with cp = 0.529 Btu/lb.R and R=96.2 ft.lb/lb.R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5 psia. Compute (a) T2, (b) AH, (c) AU and (d) AS, (e) for an internally reversible nonflow process, what is the work?

6.107 Figure P6.107 provides the schematic of a heat pump using Refrigerant 134a as the working fluid, together with steady-state data at key points. The mass flow rate of the refrigerant is 7 kg/min, and the power input to the compressor is 5.17 kW. (a) Determine the co- efficient of performance for the heat pump. (b) If the valve were re- placed by a turbine, power could be produced, thereby reducing the power requirement of the heat pump system. Would you recommend this power-saving measure? Explain. She P2 = P3 = 9 bar Tz = 60°C Saturated liquid Condenser Expansion W = 5.17 kW Compressor valve Evaporator m= 7 kg/min P1 =P4 = 2.4 bar FIGURE P6.107

A turbine, operating under steady-flow conditions, receives X1 kg of steam per hour (For X1 refer Table. 1). The steam enters the turbine at a velocity of 3000 m/min, an elevation of 5 m and a specific enthalpy of 2787 kJ/kg. It leaves the turbine at a velocity of 6000 m/min, an elevation of 1 m and a specific enthalpy of 2259 kJ/kg. Heat losses from the turbine to the surroundings amount to 16736 kJ/h. Determine the power output of the turbine.

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A 2.2 kW pump operating at steady state draws in liquid water at 100 kPa, 20 C and delivers it at 500 kPa at an elevation 7 meters above the inlet. There is no significant change in velocity between the inlet and exit, and the local acceleration of gravity is 9.81 m/s². Would it be possible to pump 4000 L in 10 minutes or less? Explain using considerations of generalized reversible flow processes discussed in class.