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Find the elapsed time to vaporize the propane and total work produced. Also find theoretically maximum possible total work output for the given QCOLD, WREV,MAX.
Find the actual cycle coefficient of performance, the rate of waste heat rejection (kJ/hr) and electrical cost per hour. Repeat/Compare results for COP, waste heat rate (kJ/hr) and operating cost.
A pump steadily draws water through a pipe from a reservoir at a volumetric flow rate of 22 gallons per minute. At the pipe inlet, the pressure is 14.7 psi, the temperature is 68 °F, and the vel
Air at 110 kPa and 250 K is compressed steadily to 570 kPa and 400 K. The mass flow rate of air through the compressor is 0.03 kg/s. A heat loss of 16 kJ/kg occurs during the process.
Consider two reversible refrigerators operating in series. Determine the temperature (°C) of the intermediate reservoir.
Link BC is 6 mm thick and is made of a steel with a 450-MPa ultimate strength in tension. What should be its width w if the structure is being designed to support a 20-kN load P with a factor safet
It is found that ozone reaction in water nearly follows first-order kinetics in ozone concentration decreases by 50% in 12 minutes (t1/2 = 12 min).
A compressor is used to pressurize pure oxygen for respiratory assistance applications. Determine the maximum outlet pressure assuming isentropic compressor
How much work must be done by a Carnot refrigerator to transfer 1.0 J as heat (a) from a reservoir at 1.1°C to one at 28°C, (b) from a reservoir at -74°C to one at 28°C, (c) from a
An electric motor draws a current of 10 amp with a voltage of 110V. The output shaft develops a torque of 10.2 N-m and a rotational speed of 1000 rpm. For steady-state operation, determine the rate
A pump accepts liquid water at 60 °F and 14 psia and compresses it to a pressure of 100 psia. Determine the input power of the pump (hp).
A Balloon is to be filled from a helium tank. The tank is large and the tank pressure remains effectively constant while the balloon is filled. A valve between the tank and the balloon controls the
Water contained in a piston-cylinder assembly, initially at 1.5 bar and a quality of 20% is heated at constant pressure until the piston hits the stops.
A .5 inch solid bar is to be tested for its strength by applying a torsional force until the bar completely brakes in half (goes beyond its ultimate shearing stress).
A cylinder fitted with a piston is filled with 600 lb of saturated liquid ammonia at 45°F. The piston weighs 1 ton and has a diameter of 2.5 ft. What is the volume occupied by the ammonia, in ft
The machine's steady state amplitude is measured as 1.5 mm. What is the amplitude of the excitation provided to the machine? Damping is assumed being not present.
A room with 42 kg of dry air has 1 kg of water vapor. If the enthalpy of the water vapor at 31 deg Celcius is 3,406 kJ/kg, determine the enthalpy of the air per unit mass of dry air in kJ/kg dry air
Assume ends of bar in 5-7 have been kept constanst at 100 degrees C for a long time. Then at some instant t=0 the temperature at x=L is suddenly changed to 0 degree C and kept there.
A piston-cylinder device initially contains 0.07 m3 of nitrogen gas at 130 kPa and 120 oC. The nitrogen is now expanded polytropically to a state of 100 kPa and 100 oC.
A 30-kg aluminum block initially at 140 C is brought into contact with a 40-kg block of iron at 60 C in an insulated enclosure. Determine the final equilibrium temperature and the total entropy cha
Ignoring the heat transfer, changes in potential energy, and the kinetic energy in inlet, calculate (a) The power output from this turbine, in kW. (b) The cross-section area of the exit, in m2.
Consider the isothermal expansion of 4.50 mol of an ideal gas at 450 K from an initial pressure of 12.0 bar to a final pressure of 2.75 bar.
In each case locate the state on sketches of the T-v and p-v diagrams.(a) Four kg of water at 100C fill a closed container having a volume of 1m^3. If the water at this state is a vapor, determine t
What would be the energy absorbed if a 60-lb, 31.5-in pendelum was released from an angle of 50 degrees hit a test bar, then rose to an angle of 20 degrees after impact?
This bend discharges water (1000 kg/m^3) into the atmosphere. Determine the force components at the flange required to hold the bend in place. The bend lies in a horizontal plane.