1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and 1100 oC to 1 bar, the index of expansion is 1.75, find the work done and the heat transfer. Example 2.13 A steam turbine operating under steady flow conditions receives 3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg. Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the power output of turbine.

1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and 1100 oC to 1 bar, the index of expansion is 1.75, find the work done and the heat transfer. Example 2.13 A steam turbine operating under steady flow conditions receives 3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg. Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the power output of turbine.

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

1 kg of steam at initial conditions of 5.1 MPa and 370 °C expands in a turbine until it becomes saturated. It is withdrawn and reheated to 340°C. After further expansion in the turbine to 160 , part of the steam is extracted for feedwater heating. The remaining steam expands to the condenser pressure of 0.018 MPa. find Wnet, Ec, Ee and the ideal steam rate. Remember, 1. For values taken from the steam tables: Use them as is, do not round off. 2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places. 3. PLEASE USE THE STEAM TABLE PROVIDED: https://drive.google.com/drive/folders/15t3WMv7xSTHmwXWXp0X2ZV6aYWhXuRCS?usp=sharing
There exists reduction of 1 pound of steam per minute undergoing an isothermal process from 27.5 bar, 316 deg C to 6.8 bar. Compute for steady flow work in BTU/min if change in kinetic energy is 42 hp
200Kg/min superheated steam at 40 bar and 350C enters a turbine through a 7.5cm ID pipe. It exits at 5bar as saturated steam through a 5cm ID pipe neglect the change in potential energy of the system. What is the temperature of the outlet saturated system? How much energy is transferred to or from the turbine?
(2.) Steam enters a turbine with an enthalpy of 1292Btu/lb and leaves with an enthalpy of 1098 Btu/lb. The transferred heat is 13 Btu/lb. what is the work in kW and in hp for a flow of 2 lb/sec? draw a figure also, and explain each step by step solution.
Air at 30°C Dry-bulb temperature, 40% RH enters a heating chamber at the rate of 500 cmh (cu.m/hr). The air undergoes constant temperature heating and leaves the chamber with an RH of 70%. (a.) At standard atmospheric condition, find the heat added (in kW) and the amount water added (in kg/ min).
1. Two kilograms of air at a pressure of 2.25 MPa and temperature of 27C is heated atconstant volume to a final pressure of 2.5 MPa. Compute for the:a. Change in internal energyb. Change in enthalpyc. Change in entropyd. Heat transferrede. Non-flow work 2. In a constant pressure process, 325 KJ of heat are added to 6.55 kg of ideal gas(R=208 J/kg-K and k = 1.65) initially at 290 K. Calculate:a. Final Temperatureb. Change in enthalpyc. Change in internal energyd. Change in entropye. Non-flow work
3. Ten Ibm of an ideal gas is compressed in a piston-cylinder arrangement to 1/10 of its initial volume. The ideal gas has a molecular mass (M) of 25 and the ideal gas heat capacity is given by C, = 0.4 + 0.3 x 103 T-0.2 x 106 T² Btu/(lbm °R) where Tis in Rankine. If the initial state 1 is 5 psi and 80° F and the process is polytropic with n=1,3, what is the final (state 2) pressure in psi (8%), the final temperature in °R (8%), the work done in Btu (10%), and the internal energy change (rigorous integration of C. from Tj to T2 is required) (12%), and the heat transfer in Btu (2%) for the process? 人3 13. 1.3 3-R+V B20x (4) 20x0"- 1.3 = 399.1 Psi it
In the following question you may ignore changes in elevation and velocity of the fluid. (a) In a steam power plant liquid water enters the boiler at a temperature of 40°C and exits as wet steam at a pressure of 15 bar with a dryness fraction of 0·95. Find the heat transfer per kg to the steam. (b) The wet steam passes through a superheater and emerges at a pressure of 15 bar and temperature of 300 °C. It then passes through a turbine, generating 400 kW of power as it does so, and comes out as wet steam at a pressure of 1 bar. The mass flow rate is 0·57 kg/s. There is no heat loss from the turbine. (i) Show that the exit specific enthalpy is about 2337 kJ/kg. (ii) Find the dryness fraction of the steam at the turbine exit. (c) Sketch the T-S diagram for the Rankine (steam plant) cycle and describe the processes. Also indicate on the diagram the points corresponding to the inlet and outlet of the boiler, superheater and turbine.
4.54 kg mass of water vapor at 100kPa (abs) and an entropy of 8.0333 kJ/kg K; undergo a process at constant pressure to a state where the occupied volume is 1.62 m3/kg. It is requested: a. Plot t-V diagram b. Find the initial temperature (°C) c. Find the quality (%), moisture (%) and final internal energy (kJ)
1 kg of steam at initial conditions of 5.1 MPa and 370 °C expands in a turbine until it becomes saturated. It is withdrawn and reheated to 340°C. After further expansion in the turbine to 160 , part of the steam is extracted for feedwater heating. The remaining steam expands to the condenser pressure of 0.018 MPa. For 1kg of steam, find Wnet, Ec, Ee and the ideal steam rate. Remember:1. For values taken from the steam tables: Use them as is, do not round off.2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places.PLEASE USE THE STEAM TABLE PROVIDED: https://docs.google.com/document/d/1crebk95lXFEAR5d6Y6LymXJNraO9WLgtNjquSlVOvVs/edit
A radiator by steam is used to heat a closed room. Heat is lost from the room to the outside at a rate of heat transfer by Newton Law. The outside temperature of the room is 5 C and dimensions of room are 3 mx 4 m × 5 m. Saturated steam at 4.0 bar condenses in the radiator and emerges as a liquid at the saturation temperature. The temperature inside the room at the initial radiator is turned on is 18 C. The overall heat transfer coefficient between inside and outside room is 28 W/m² C. The heat capacity of air to be constant is 36 J/(mol C). (a) Write a differential energy balance on the room air. (b) Integrate the unsteady-state balance to calculate the time required to achieve a temperature of 22 C.
volume ate Frample 5.25. A closed vessel contains 3 kg of CO, at pressure 70 kPa and temperature 300 K. Heat is supplied to the vessel till the gas attains 140 kPa of pressure. Calculate : (a) final temperature, (b) work done on or by the gas, (c) heat added, and (d) change in internal energy. For CO, : take c, = 0.65 kJ/kg K. are %3D lume