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Superheated steam enters one section of an open end feed water heater at 5bar and 240 c with a mass flow rate of 1 kg/s. compressed liquid water at the same pressure and 35 C enters another inlet. The mixture of these two streams leaves as a saturated liquid at the same pressure. If the heater is adiabatic, calculate the entropy generation rate for the process.
water is pump from a lake to a storage tank at 18m above at a rate of 70 L/s while consuming 20.4 kW of electric power. disregarding any frictional losses in the pipes and any change s in kinetic energy, determine (a) the overall efficiency of the..
A large plastic casting with thermal diffusivity 6.0 x10^7 m2 /s is removed from its mold at a uniform temperature of 150 degrees C. The casting is then exposed to a high-velocity air stream such that the surface experiences a sudden change in temper..
an air standard diesel cycle has a compression ratio of 20 and the heat transferred to the working fluid per cycle is
10 [kg] of refrigerant 134a contained in a piston-cylinder assembly undergoes a polytropic process for which Pvn = Constant. The initial and final states of the refrigerant are: P1= 240 [kPa], T1= -5 [oC], and P2= 960 [kPa], T2= 70 [oC], respectively..
a 6.2 mg sample of 90sr half-life 29.12 y is in secular equilibrium with its daughter 90y half-life 64.0 h. a how many
consider two reversible refrigerators operating in series. the first refrigerator removes heat at the rate of 250 kw
consider a gas-turbine cycle with two stages of compression and two stages of expansion. the pressure ratio across each
steam enters a nozzle at 30 bars and 320c and leaves at 15 bars with a velocity of 535 ms. the mass flow rate is 8000
A vessel with a frictionless piston contains 1 ft^3 of a gas at 200 psia. The piston is held in position by applying an external force. Calculate the amount of work done if:
a mixture of vapor and liquid water with mass of m.1kg is contained in a rigid glass vessel with an initial temperature
One-half kilogram of water executes a Carnot power cycle. During the isothermal expansion, the water is heated until it is a saturated vapor from an initial state where the pressure is 1.5 MPa and the quality is 25%. The vapor then expands adiabatica..
A power cycle operates between a reservoir at temperature TH and a lower-temperature reservoir at 280 K. At steady state, the cycle develops 40 kW of power while rejecting 1000 kJ/min of energy by heat transfer to the cold reservoir. Determine the mi..
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