(7). In a gas turbine system air is taken into the compressor at 100kPa and 18°C. It is compressed through a compression ratio of 5:1 with an isentropic efficiency of 85%. The air passes to a combustion chamber where it is heated to 815°C by the addition of fuel. In the turbine it is expanded down to 100kPa with an isentropic efficiency of 88%. If the mass flowrate of the air is 4.5kg/s and the mass of fuel neglected, calculate: (a). the net power output of the turbine if it is coupled to the compressor (b). the plant's thermal efficiency (c). the mass of fuel burnt per hour (d). the air-fuel ratio The calorific value of the fuel is 43.3 MJ/kg

Before compression of an ideal Otto cycle the air is at 100 kPa and 300 K. The compression ratio is 10 and 750 kJ/kg of heat is added during the cycle. Assume that specific heats vary with temperature. Determine the temperature at the end of the compression process in K. Round your answer to one decimal place. Determine the maximum temperature in the cycle in K. Round your answer to one decimal place.

To control an isentropic steam turbine, a throttle valve is placed in the steam line leading to the turbine inlet. Steam at 6 MPa and 600°C is supplied to the throttle inlet, and the turbine exhaust pressure is set at 40 kPa. What is the effect on the stream exergy at the turbine inlet when the throttle valve is partially closed such that the pressure at the turbine inlet is 2 MPa?

A portion of a turbojet engine is shown in the figure below. Air flowing at 25 kg/s at 240 K and 80 kPa (State 1) enters an adiabatic and reversible diffuser with a velocity of 250 m/s. It leaves the diffuser with negligible velocity (State 2). As a result, you may assume the velocity of the air leaving the diffuser is small compared to the velocity of air entering the diffuser. The air is then compressed in an adiabatic compressor with an isentropic efficiency of 80%. The compressor requires 7 MW of power (work input). You may assume air is an ideal gas with constant specific heats. Use the correct specific heats in the table below in analyzing the different processes. Air Properties Cp Cy R kJ/kgK kJ/kgK kJ/kgK Diffuser (Process 1 to 2) Compressor (Process 2 to 3) 1.003 0.716 0.287 1.014 0.727 0.287 1. Calculate the pressure of the air in kPa leaving the compressor (State 3).