Chapter 8, Problem 8.17P

Superheated steam at 20 MPa, 560 deg C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 deg C. The pressure is increased to 20.1 MPa across the pump. The turbine and pump have isentropic efficiencies of 81% and 85%, respectively. Cooling water enters the condenser at 20 deg C with a mass flow rate of 70.7 kg/s and exits the condenser at 38 deg C. For the cycle, determine (a) the mass flow rate of steam, in kg/s. (b) the thermal efficiency.

Superheated steam 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.

A reheat cycle with two stages of reheating is executed, with steam expanding initially from 90 bar and 530°C. The two reheater pressures are 10 bar and 0.6 bar, and the steam leaves each reheater at 480°C. Condensation occurs at 0.03 bar. What is the steam flow rate in kg/s for an engine output of 20,000 kW?

The production well of a typical geothermal power plant is at 230°C saturated liquid and ground water flow rate of 230kg/s with separator pressure of 0.5MPaa while its condenser pressure is at 0.01MPa. the turbine and generator efficiencies are 83% and 87% , respectively. Sketch the T-s diagram of the system. Determine the amount of mass flowing into the reinjection well from the separator, generator output, heat rejection in the condenser and overall plant efficiency.

Steam enters the turbine of a simple vapor power plant with a pressure of 10 MPa and temperature T, and expands adiabatically to 6 kPa. The isentropic turbine efficiency is 85%. The saturated liquid exits the condenser at 6 kPa and the isentropic pump efficiency is 82%. (a) For T = 580°C, determine the turbine exit quality and the cycle thermal efficiency. (b) Plot the quantities of part (a) versus T ranging from 580 to 700°C.Note: Please produce a concise, workable solution that includes all of the necessary details and explanations. Thank you so much; if the wish is fulfilled, I'll hit "like" right away.

2. The turbine of a 1-MW steam power plant is supplied with superheated steam at 3000 kPa and 573 K, where it is expanded to the condenser pressure of 5 kPa. The isentropic efficiency of the turbine is 85%. The saturated liquid leaving the condenser is pumped to the boiler pressure by means of the feed water pump, the thermodynamic efficiency of which is 80%. Determine: (a) The efficiency of the ideal Rankine cycle (b) Thermal efficiency of the cycle (c) The rate of production of steam.

thermodynamics

In a steam power plant steam enters the turbine at 6 bar and 4000C and is expanded isentropic ally to the condenser pressure of 0.1 bar. If the isentropic efficiency of the turbine is 80%, find the actual net work output and the thermal efficiency.

Steam enters the turbine of a cogeneration plant at 6 MPa and 550 degrees * C . One-third of the steam is extracted from the turbine at 1400 kPa pressure for process heating. The remaining steam continues to expand to 20 kPa. The extracted steam is then condensed and mixed with feedwater at constant pressure and the mixture is pumped to the boiler pressure of 6 MPaThe mass flow rate of steam through the boiler is 30 kg/s. Disregarding any pressure drops and heat losses in the piping, and assuming the turbine and the pump to be isentropic, determine (a) the net power produced(b) the utilization factor of the plant, (c) the exergy destruction associated with the process heating, and (d ) the entropy generation associated with the process in the boiler. Assuming a source temperature of 1000 K and a sink temperature of 298 K