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Consider a combined gas-steam power cycle. The topping cycle is a simple Brayton cycle that has a pressure ratio of 7. Air enters the compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at 950 ºC. The bottoming cycle is a reheat Rankine cycle between the pressure limits of 6 MPa and 10 kPa. Steam is heated in a heat exchanger at a rate of 1.15 kg/s by the exhaust gases leaving the gas turbine, and the exhaust gases leave the same exchanger at 200 ºC. Steam leaves the high-pressure turbine at 1 MPa and is reheated to 400 ºC in the heat exchanger before it expands in the low-pressure turbine. Assuming 80 percent isentropic efficiency for all pumps and turbines, 1) Determine the enthalpy of air at the compressor outlet. Determine the enthalpy of air at the Turbine outlet. determine the enthalpy of steam-water mixture at the low pressure turbine outlet.Determine the moisture content at the exist of the low-pressure turbine.Determine the steam temperature at the inlet of the high-pressure.Determine the net power output of the combined plant.Determine the thermal efficiency of the combined plant.
an office building where smoking is prohibited has 600 employees. the building is to be maintained at 78 db and 65 wb
Water at 10 °C is pumped from a lake as shown in Fig. P8.79. If the flowrate is 0.011 m3 /s, what is the maximum length inlet pipe, , that can be used without cavitation occurring?
Determine the number of pounds of helium within it if its volume = 68,000 ft^3 and the temperature and pressure are 80 F and 14.2 psia.
a smoking lounge is to accommodate 15 heavy smokers. the minimum fresh air requirement for smoking lounges is specified
consider a regenerative cycle utilizing steam as the working fluid. steam enters the turbine at 3.5 mpa 400oc and
How can you tell what kind of primary atomic bonding is present by noting where the involved elements are located on the periodic table? Describe how the electron negativity difference between atoms affects the ionic/covalent character of a bond.
a 100-kg copper block initially at 110degc is dropped into an insulated tank that contains 150 kg of water at 15degc.
4 kw motor is driving an oil pump with an efficiency of 95 in a 10 mm diameter pipe. if the velocities of the fluid in
Important information about Overall Heat Transfer Coefficient A copper sphere of internal diameter 2 m and wall thickness 40 mm is insulated with 75 mm of expanded polystyrene
Find the needed suction pressure that will lead to critical flow in the nozzle, the mass flow rate, and the blower work, assuming the blower exit is at atmospheric pressure, 100 kPa.
a load p 4000 lb acting at a point a of a beam produces 0.25 in at point b and 0.75 in at point c of the beam. find
The tires that fail in a period are replaced in the same period. The company is currently considering two options. First, to determine the optimal replacement age (period) of all tires or second, replace tires as they fail.
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