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A gas turbine (can assume an ideal Brayton cycle) has a pressure ratio of 10. It is connected to an electric generator with an efficiency of 95% which produces 200MW of electricity. The gas turbine burns natural gas with a heating value of 100,000 btu/therm. The waste heat from the gas turbine is used to generate steam in an ideal Rankine cycle. The efficiency of the Rankine cycle is 30%. The turbine of the Rankine cycle is attached to an electric generator with an efficiency of 95%. What electric output would you estimate for this electric generator? This system is called a combined cycle where you combine a gas turbine with a Rankine cycle (called the bottoming cycle in this case) to achieve an overall higher efficiency.
A diesel engine is fitted with a turbocharger that comprises a radial flow compressor driven by a radial flow exhaust gas turbine. The gravimetric air-fuel ratio is 20:1; the air is drawn into the compressor at a pressure of 1 bar and at a temperatur..
a cylindrical tank with hemispherical ends is required to hold 150 psi of pressurized air at room temperature. the
A block is L = 1 [m] long and h = 0.5 [m] tall and weighs 50 [N]. The box is allowed to rotate about point A. A rope is attached to the upper left corner. This rope makes a θ=40° angle from the horizon. A horizontal force of 30 [N] is applied at th..
the 2-lb box has a velocity of 5 fts when it begins to slide down the smooth inclined surface at a. the coordinates of
at an amusement park there are 200-kg bumper cars a b and c that have riders with masses of 40 kg 60 kg and 35 kg
A heat pump operates at steady state maintains a house at 22 0C when the outside is -22 0C using 15 kW of power. The manufacturer claims that the power input required is 3.2 kW. Applying energy and entropy rate balances evaluate the claim.
a supersonic aircraft consumes 5320 imperial gallons of kerosene per hour of flight and flies an average of 14 hours
An engine block with a surface area measured to be 0.90m2 generates a power output of 55 kW with a net engine efficiency of 35%. The engine block operates inside a compartment at 157oC and the average convection heat transfer coefficient of 60 W/m..
a 20-mm diameter rod made of a ductile material with a yield strength of 350 mpa is subjected to torque of 100 n.m and
A mass of 0.5 g of air is contained in a piston-cylinder device. Initially the system is at 100 kPa and 25°C. The system is now compressed adiabatically to a volume 17 times smaller and a temperature of 700 K.
silica sio2 is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when
A frictionless piston-cylinder contains 3.0 kg of H2O and is initially at 300 kPa. The initial volume is 1.0 m3. The water is heated until the temperature is 300 C. If the volume within the system reaches 1.5 m3, the piston hits a set of stops and is..
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