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Problem 6.14:
A steam turbine generates 800 kW of work by expanding steam from 50 bar, 400 °C to 1 bar. At the exit of the turbine the steam contains 2% moisture. a) Determine the flow rate of steam through the turbine. b) Determine the efficiency. c) Determine the rate of entropy generation in kJ/K s. Problem 6.15:
Methane passes through a compressor and is subsequently cooled in a heat exchanger. Methane enters the compressor at 1 bar, 20 °C with volumetric flow rate 30 ft3/min; it exits the heat exchanger at 10 bar, 20 °C.
The compressor efficiency is 80%. Assuming methane to be in the ideal-gas state with
J/mol K, do the following:
a) Calculate the work in the compressor (in J/s) b) Calculate the required heat in the heat exchanger. c) Calculate the entropy generation.
Suppose you pour a gallon of water on a yowling cat 10 ft below your bedroom window. (a) How much potential energy (ft · 1bf) does the water lose?
Adipic acid is used in the manufacture of nylon 6,6. It is made by hydrogenation of phenol to a mixture of cyclohexane and cyclohexane (known as KA oil-ketone and alcohol), followed by oxidation with nitric acid.
why a substance is being heated at a fast rate the temperature of decomposition will be the higher than the obtain at a
If the motor is operating on load with a power angle of -20°, and the excitation is adjusted so that the excitation voltage is equal in magnitude to the terminal voltage, determine the armature current and the power factor of the motor.
The armature terminal voltage is halved, with the field current and load torque remaining the same. (c) The field current and the armature terminal voltage are halved, with the horsepower output remaining the same.
Evaluate particle diameter at different terminal gas velocities
The estimated cost of the pipes, per unit length is: schedule 40 carbon steel $5, schedule 80 carbon steel $8.30, stainless steel (304) schedule 40 $24.80. Installation and fittings for all the materials adds $16.5 per unit length. The downtime re..
Is this a reasonable value from a physiologic point of view? Would the patient be considered normal or diabetic?
A sealed rigid tank contains 1 kg of wet steam at 300 °C. The fraction of the liquid in the tank is not known. Upon adding heat to the tank it is observed that the vapor condenses. The heating stops when the system becomes saturated liquid. At tha..
A 2300-V, three-phase, wye-connected, round rotor synchronous motor has a synchronous reactance of 3 Ω per phase and an armature resistance of 0.25 Ω per phase. The motor operates on load with a power angle of -15°, and the excitation is adjusted ..
Assuming that the two unsealed faces of the wood immediately jump to an equilibrium moisture content of 10 lb H20 per 100 lb of dry wood, determine the time for the moisture to penetrate to the center of the slab (2 in. from either face). Assume a..
determine the maximum value of the voltage induced in the coil.
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