Chapter 8, Problem 8.16P

Steam enters the turbine of a simple vapor power plant with a pressure of 12 MPa and a temperature of 600°C and expands adiabatically to condenser pressure, p. Saturated liquid exits the condenser at pressure p. The isentropic efficiency of both the turbine and the pump is 84%. a. For p = 30 kPa, determine the turbine exit quality and the cycle thermal efficiency. b. Plot the quantities of part (a) versus p ranging from 6 kPa to 100 kPa.

4 new

Q2) The following data relate to a regenerative steam power plant generating 22500 kW energy, the alternator directly coupled to steam turbine : Condition of steam supplied to the steam turbine 60 bar, 450 degrees * C Condenser vacuum ... 707.5 mm Pressure at which steam is bled from the steam turbine ... 3 bar Turbine efficiency of each portion of expansion ... 87 per cent Boiler efficiencyper cent Alternator efficiency ... 94 per cent Mechanical efficiency from turbine to generator ... 97 per cent Neglecting the pump work in calculating the input to the boiler, determine (i) The steam bled per kg of steam supplied to the turbine. (ii) The steam generated per hour if the 9 percent of the generator output is used to run the pumps. (iiiThe overall efficiency of the plant.

As shown below, a refrigeration cycle condenses a flow of ammonia from a saturated vapor at 4 barto a saturated liquid. The entering volumetric flow rate of the ammonia is 0.1 m3/s. The ammonia functions asthe cold reservoir for the refrigeration cycle, and the hot reservoir is at 25 ∘C. A faded specification sheet for therefrigeration cycle reads that the required power input is 35 kW.(a) Is this cycle possible? Why or why not?(b) If the cycle is impossible, how much work input is required to make the cycle

Rankine cycle

2. A reheat cycle with two stages of reheating is executed with steam expanding initially from 20 MPa and 540 °C. The two reheater pressures are 3.8 MPa and 0.97 MPa and the steam leaves each reheater at 540 °C. Condensation occurs at 60 °C. For the ideal cycle and 1 kg/sec of steam, find the following: a. Heat added b. Cycle efficiency 3. A steam power plant operates on the reheat Rankine cycle. Steam enters the high-pressure ino ot 12 5 AARa an d 550 oc 77 1.

Steam enters the turbine of a vapor power plant at 600 lbf/in.², 700°F and exits as a two-phase liquid-vapor mixture at 100°F. Condensate exits the condenser at 95°F and is pumped to 600 lbf/in.2 The turbine and pump isentropic efficiencies are 90 and 80%, respectively. The net power developed is 1 MW. Determine: (a) the percent steam quality at the turbine exit. (b) the percent thermal efficiency. (c) the steam mass flow rate, in lb/h.

PLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)

Q1) Steam is supplied to a turbine at 30 bar and 350°C. The turbine exhaust pressure is 0.08 bar. The main condensate is heated regeneratively in two stages by steam bled from the turbine at 5 bar and 1.0 bar respectively. Calculate masses of steam bled off at each pressure per kg of steam entering the turbine and the theoretical thermal efficiency of the cycle. 1 kg Turbine 1- m- m2 O 1-m, w -u -11 Condenser m. h, m2. h2 1 kg 1 kg Heater-1 Drain cooler m, Heater-2 (LP.) m,+ m. (Н.Р.)