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Determine the back work ratio and the thermal efficiency of the cycle, assuming (a) no regenerator is used and (b) a regenerator with 75 percent effectiveness is used. Use variable specific heats.
What is the pump inlet condition for a Rankine cycle? the heat added by the boiler (kJ/kg); the cycle efficiency; the efficiency of a Carnot cycle operating between the same temperature limits.
It is necessary to maintain a pressure of 180 psi at the snow making machine. Determine the horsepower added to the water by the pump. Neglect minor loses.
Show that the moment of inertia of n particles each of mass (1/n)*m rotating about some point O at a distance R with the same angular speed w is I = mR^2.
The prevailing wind velocity is 50 km/h. The atmosphere is in a condition of neutral stability. Calculate the height of the gas plume by two methods.
If the compressor consumes 400 W of power and the COP the refrigerator is 2.2, determine (a) the mass flow rate of the refrigerant and (b) the rate of heat rejected to the kitchen air.
Calibrated vibrometer output indicates a velocity amplitude (1/2 peak-to-peak) of 3.8 mm/s. Determine (a) the displacement amplitude in mm and (b) the acceleration amplitude in standard g's.
Use entropy balance for a closed system to determine whether the entropy change of the following processes is positive, negative, zero, or indeterminate.
The refrigerant leaves the condenser at 0.7 MPa, 26 °C. Ignoring heat transfer between the compressor and its surroundings, determine the rate at which heat energy is removed from the refrigerat
Saturated liquid leaves the condenser at 30 °C. The mass flow rate of refrigerant is 0.08 kg/s. Determine the rate of heat rejection from the condenser, in kW.
Knowing that at the instant shown the rod has an angular velocity of 3 rad/s counterclockwise and theta= 30 degrees, determine reactions at point A and point B.
Determine the reduction in the exit temperature of the compressed air and the compressor power saved. Assume water vaporizes completely before leaving the compressor.
The refrigerant leaves the condenser at 0.7 MPa, 26 °C. Determine the rate at which heat energy is removed from the refrigerated space, in kW,
Consider an ideal vapor-compression refrigeration cycle. The refrigerator employs Refrigerant 134a as the working fluid and operates at steady state. Determine compressor power, in kW.
The fuel mass flow rate is 60 kg/min. Assume that the plant operates adiabatically. Calculate the power generated by the plant at steady state in MW.
Compute the value of the corrosion potential. How long do you think corrosion would take to eat away a 0.1-mm thick surface layer of the lead sheet?
Determine the maximum theoretical power that could be developed by any one-inlet one-exit control volume at steady state, that would reduce the steam to the dead state at the exit.
What is the flow rate of water when the gauges show a pressure difference between the top section and the bottom one to be 31 kN/m2.
For this maximum flowrate, determine the values of static temperature, static pressure, stagnation temperature, stagnation pressure, and velocity at the inlet and the exit of the constant area duct.
Design 2-shell pass and 8-tube pass heat exchanger for heating ethyl alcohol from 25°C to 70°C at a rate of 2.9 kg/s. Water is available at 95°C can cool down to 45°C.
The gas undergoes complete combustion with 120% of the stoichimetrically required air. A) Write the balanced equation B) Calculate the fuel-air ratio on a molar and mass basis.
Find the equation for max stress and strain in the beam at the maximum deformation point in terms of applies load and measured displacement.
Determine the channel height that can be used to determine the wall shear stresses as high as 20 dyne/cm2 with flow rates less than 2 cm3/s.
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. How much farther would it travel on the moon then on earth?
What is the outlet pressure if the inlet pressure is 100 mm Hg and the velocity of blood is 20 cm/s. State all assumptions clearly?