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Reheat, where high pressure and low pressure turbines are used, is added to a simple steam cycle to increase the steam quality at the location where the steam exits the low pressure turbine and goes to the condenser. Consider a steam cycle where the turbine entrance pressure and temperature are 3.5 MPa, 400°C, and the condenser pressure is 10 kPa. (a) Compare the turbine exit quality for a simple cycle (without reheat) with that for the low-pressure turbine exit quality of a reheat cycle where the exit at 0.8 MPa of the high-pressure turbine is reheated to 400°C and then expands through the low pressure turbine to 10 kPa. Also, (b) compare cycle efficiencies.
The efficiency of a pump is assumed to be a function of the flow rate Q (cubic ft/sec), pressure increase? p, pipe diameter d, and density and viscosity of the fluid. Use dimensional analysis to find an expression for the pump efficiency.
A 1.5-kg specimen of a 88wt% Pb-12wt% Sn alloy (Animated Figure 9.8) is heated to 220°C; at this temperature it is entirely an alpha-phase solid solution. The alloy is to be melted to the extent that 50% of the specimen is liquid, the remainder being..
air is compressed in an isentropic process from an initial pressure and temperature of p 1 90 kpa and t1 22 oc to a
Gravity elevators are an old idea in science fiction and consist of an evacuated tunnel dug straight through the centre of the Earth as shown below. The idea is that the elevator falls due to gravity until it reaches the other end.
certain system is able to exert an external force f according to the relationship.v velocityf 15000-500vn for v lt
A power plant generates steam from coal burning which burns at 3,000oF and produces about 13,000 BTU per pound. The steam is put into a poorly insulated turbine which allows 2,000 BTU per pound of coal to escape to the atmosphere at 90oF. Knowing the..
A piston-cylinder device with a set of stops initially contains 0.6kg of steam at 0.8MPa and 500°C. The location of the stops corresponds to 60percent of the initial volume. Now the steam is cooled. Determine the compression work of the final state ..
steam flows steadily into a turbine at 2 mpa and 400 deg c at a flow rate of 25 kgs. if the turbine is adiabatic and
Methane is completely burned with 20% excess air, with 30% of the carbon going to CO. What is the partial pressure of the CO in the stack gas if the barometer reads 740 mm Hg, the temperature of the stack gas is 300°F
A 3.31 ft3 rigid tank contains saturated refrigerant-134 at 100psi. Initially, 14 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank. He..
a tank of volume 12m3 is initially filled with air at 22deg and 100 kpa a vacuum pump slowly removes air from the tank
Water flows through a 1 [cm] diameter circular pipe at a flow rate of 127 [cm3/s]. Determine the entrance length.
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