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Saturated liquid water is compressed from 100 kPa (State 1) to 2.5 MPa (State 2) in an adiabatic pump having 85% isentropic efficiency. Determine the entropy generation (kJ/kg-K) for the pump.
Calculate (a) the coal firing rate in lb/hr, (b) the fuel gas flow rate in scfm, and (c) the SO2 removal efficiency needed to meet a standard of 1.4 lb/MWh gross electrical energy output.
The facility is required to collect all the vented air and route it to a biofilter to control total emissions to less than 30 kg of ethanol per day. Calculate the required control efficiency.
The power output of the two-stage turbine is 80 MW and isentropic efficiency of each turbine stage is 84%. Calculate the rate of entropy generation (kW/K) for the two-stage turbine.
What is the fracture toughness K1c of the material of the sample? If the material has a modulus E of 200 GPa, what is its toughness?
A homogeneous liquid solidifies directly to a solid containing A and the high temperature polymorph of B. Construct the phase diagram.
Hemispherical end caps are welded to a cylindrical main body to form a propane storage tank. Determine the minimum wall thickness Tc of the cylindrical.
A hot air balloon (approx as a sphere of diameter 50ft) is to lift a basket load of 600lbf. To what temperature must the air be heated in order to achieve lift off?
Determine the final temperature in °C, the entropy change for the copper vessel and each of the liquid water masses, and the amount of entropy produced.
The isentropic efficiency of the compressor is 80%, mass flow rate is 2247kg/hr, and I found T2s=533K and T2a=591K. How much power input does this compressor require?
Helium gas enters a nozzle whose isentropic efficiency is 88 percent with a low velocity, and it exits at 15.3 psia, 160F, and 840 ft/s. Determine the temperature and pressure at the nozzle inlet.
The compression and power stroke efficiencies are 90%. Using the provided engine data, determine the charge mass (grams). The cut-off ratio.
A 3-in. diameter rod of copper is to be reduced to a 2-in. diameter rod by being pushed through an opening. The modulus of elasticity for the copper is 17 x 106 psi and the yield strength is 40,000
It is initially at a uniform temperature of 25 °C and is suddenly immersed in a liquid at 150 °C with h = 120 W/m2-°C. Calculate the time necessary for the rod to cool to 120 °C.
Air at 35°C, 105 kPa, flows in a 100 mm × 150 mm rectangular duct in a heating system. The volumetric flow rate is 0.015 m3/s. What is the velocity of the air flowing in the duct and what
Assume that the Mercury 50 operates on an ideal Brayton cycle (no regeneration), and that the working fluid is air with variable specific heat, determine i) the thermal efficiency
A cylinder has 0.1 kg air at 25oC, 200 kPa with a 5 kg piston on top. A valve at the bottom is opened to let the air out and the piston drops 0.25 m towards the bottom.
Steam at 500 kPa, 300C is used to heat cold water at 15C to 75C for domestic hot water supply. How much steam per kg liquid water is needed if the steam should not condense?
Water at 1.5 MPa, 150°C, is throttled adiabatically through a valve to 200 kPa. The inlet velocity is 5 m/s, and the inlet and exit pipe diameters are the same.
The front of a jet engine acts as a diffuser receiving air at 900 km/h, -5°C, 50 kPa, bringing it to 80 m/s relative to the engine before entering the compressor. If the flow area is reduced to
A diffuser, shown in Fig. P6.36, has air entering at 100 kPa, 300 K, with a velocity of 200 m/s. The inlet cross-sectional area of the diffuser is 100 mm2. At the exit, the area is 860 mm2, and the
In a jet engine a flow of air at 1000 K, 200 kPa and 40 m/s enters a nozzle where the air exits at 500 m/s, 90 kPa. What is the exit temperature assuming no heat loss?
A-2-m by 1.5-m section of wall of an industrial furnace burning natural gas is not insulated, and the temperature at the outer surface of this section is measured to be 80 C.
It is suddenly exposed to an airstream of 10 °C with h = 15 W/m2-°C. How long does it take the sphere temperature to drop to 25 °C?
Assuming that the engine is made of iron and has an average thickness of 6.5cm between the combustion chamber and the outside surface, determine the heat transfer rate per unit of wall area when com