The power output of a steam turbine is 300 kW. The specific enthalpy of the steam at the inlet is 3000 kJ/kg. The steam leaves the turbine at a pressure of 30 kPa (abs) and has a dryness fraction 0.80. The efficiency of the turbine is 80%. Use steam table if required. (a) What is the mass flow rate of the steam in the turbine? (b) If the turbine runs for 20 hours a day and the price of electricity is $ 0.09/kWh, what is the annual revenue generated from the turbine? [0.45 kg/s, $197100]

The power output of a steam turbine is 300 kW. The specific enthalpy of the steam at the inlet is 3000 kJ/kg. The steam leaves the turbine at a pressure of 30 kPa (abs) and has a dryness fraction 0.80. The efficiency of the turbine is 80%. Use steam table if required. (a) What is the mass flow rate of the steam in the turbine? (b) If the turbine runs for 20 hours a day and the price of electricity is $ 0.09/kWh, what is the annual revenue generated from the turbine? [0.45 kg/s, $197100]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

In thehydroelectric power plant, water enters the turbine nozzles at 700 kPa absolute witha low velocity. If the nozzle outlets are exposed to atmospheric pressure of 100 kPa. Using Bernoulli equation, determine the maximum velocity to which watercan be accelerated by the nozzles before striking the turbinebuckets.
. Steam at an initial enthalpy of 100 kJ/kg and inlet velocity of 100 m/s, enters an insulated horizontal nozzle. It leaves the nozzle at 200 m/s. Determine the exist enthalpy (in kJ/kg).
Please Help,will provide helpful e Ratings for correct solution. Thank You. Water flows through a horizontal coil through which high-temperature flue gas passes. As water passes through the coil, it passes from the liquid phase at 200 kPa and 80°C to the vapor phase at 100 kPa and 125°C. The entry speed of water into the coil is 3 m/s and the exit speed of steam is 200 m/s. Calculate the heat transferred per unit mass of water through the coil? The enthalpies of the inlet and outlet streams are given as 334.9 kJ/kg and 2726.5 kJ/kg, respectively.
Saturated steam at 200 kPa expands in an adiabatic nozzle at an inlet velocity of 5 m/s to an exit pressure of 100 kPa. The exit stream has a quality of 95%. Estimate the change in entropy per kg.
Steam enters a turbine at 10,000 kPa and 500 °C, and exhausts at 100 °C with an enthalpy of 2000 kJ/kg. The mass flow rate is m=4.5 kg∙s-1. What is the specific volume (m3/kg) of the exiting stream?
Saturated vapor enters the turbine at 8.0 MPa and exits 0.008 MPa. The turbine has an isentropic efficiency of 82.06% Velocity and elevation changes are insignificant. Determine the electrical power it can produce in kW if the mass of steam is 32.9 kg/s, and the mechanical and electrical efficiencies are 77.75% and 93.32%. For the steam table, please use the green book entitled "Thermodynamics Properties of Water Including Vapor, Liquid, and Solid Phases" by Keenan, Keyes, Hill, and Moore.
What happens to steam pressure and velocity in a diverging nozzle?
At a particular stage of a reaction turbine the mean blade speed is 140 m/sec and the steam is at a pressure of 20 bar with temperature of 250° C. Fixed and moving blades at this stage have inlet angles 30° and exit angles 20°. The stage efficiency is 80%. Determine (1) Specific entholpy drop across the stage in kJ/kg.
Products of combustion enter a gas turbine with a stagnation pressure of 0.90 MPa and a stagnation temperature of 840°C, and they expand to a stagnation pressure of 100 kPa. Taking k = 1.33 and R = 0.287 kJ/kg·K for the products of combustion, and assuming the expansion process to be isentropic, determine the power output of the turbine per unit mass flow.
An axial flow air compressor is designed to provide an overall total-to-total pressure ratio of8:1. At inlet and outlet the stagnation temperatures are 300 K and 586.4 K respectively.Estimate the overall total-to-total efficiency and the polytropic efficiency for the compressor.Assume that  for air is 1.4.
A vapor enters a group of convergent-divergent nozzles at 3MPa and 300 oC and expands to 0.5 MPa. If the exit velocity and the steamcirculation rate are 800 m/s and 14 kg/s respectively, determine:a- The nozzle efficiency.b- The total cross-sectional area of the nozzles.c-The velocity at the throat
Saturated vapor enters the turbine at 8.0 MPa and exits 0.008 MPa. The turbine has an isentropic efficiency of 82.18%. Velocity and elevation changes are insignificant. Determine the electrical power it can produce in kW if the mass of steam is 22.0 kg/s, and the mechanical and electrical efficiencies are 78.45% and 93.99%.