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The average temperature of the stream passing through the boiler is 460 degrees celcius. What is the minimum theoretical rate at which energy could be discharged to the cooling water (MW)?
A gas turbine power plant operates on the simple brayton cycle between the pressure limits of 100 and 800 kPa.Air enters the compressor at 30 C and leaves at 330 C at a mass flow rate of 200 kg/s.
Discuss the concept of then having rough surfaces to reduce slipping (such as the differences between a waxed tile floor, concrete, and textured concrete (no calculations needed here).
Consider the combustion of butane (C4H10) in the gas phase with the theoretical amount of air. The products and reactants remain at 25 C and 1 atm. Find the enthalpy of combustion in kJ/kg of fuel f
Electricity can be directly used to heat a home by passing an electric current through a heating coil. This is a direct, 100% conversion of work to heat.
Calculate the maximum mass flow rate at the inlet condition that this compressor can handle without violating the second law of thermodynamics.
An axial flow compressor stage has blade root,mean and tip velocities of 150,200 and 250 m/s. The stage is to be designed for a stagnation temperature rise of 20K and axial velocity of 150 m/s, both
Nitrogen gas enters an adiabatic nozzle with negligible velocity, 300 kPa, 800 K and exits at 200 m/s. For a nozzle isentropic efficiency of 80%, calculate the exit temperature (K).
If the horizontal duct is uninsulated and exposed to air at 35 C in the crawl space beneath a home, what is the heat gain per unit length of the duct?
Determine the amount of excavation needed for the basement. A 2 foot working distance is required and the excavation will be sloped 1.5:1.
A blackened plate is exposed to the sun so that a constant heat flux of 800 W/m^2 is absorbed. The back side of the plate is insulated so that all the absorbed energy is dissipated into the airstrea
Determine the required volume of the cuts and fills for a new road, using the average-end-area-method.
A Carnot heat engine receives heat from a reservoir at 900 degrees Celsius at a rate of 800kJ/min and rejects the waste heat to the ambient air at 27 degrees Celsius.
A motor car shaft consist of a steel tube 30 mm internal diameter and 4 mm thick .thee engine develops 10kW at 2000r.p.m.Find the maximum shear stress in the tube when the power is transmitted thro
Consider a Rankine cycle operating in an ideal reheat mode where the high pressure turbine receives steam at 8MPa and 450 deg. C; the low-pressure turbine is operated at 500kPa ond 500 deg.
If the 160-lb person jumps directly off the back of the boat with a velocity of 7 ft/s, determine the resulting velocity of the boat and remaining person.
A worm gear set has a velocity ratio of 0.05. The worm has two teeth, a lead of 3 in., and a pitch diameter of 1.5in. Determine the helix angle and pitch diameter of the worm gear.
Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 50 meters and wind conversion efficiecy of 14.9 percent. The turbine operates in an area with an average annual wind
The piston diameter is 20.0 cm and the pump's stroke is 22.0cm. The pump is attached to an electric motor that is turning at 1750 RPM.
Draw a free body diagram of the spring cut near the point A and identify the internal forces and moments transmitted across the cut. Hence determine the magnitude and location of the maximum shear str
A well-insulated rigid tank contains 5 kg of a saturated liquid-vapor mixture of water at 150 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed
Calculate the mole fractions (dry basis) and the ppm (parts per million on a wet basis, or moles contained in 106 moles of the wet stack gas) of the stack gas species that might be considered enviro
A 4 lb block with an initial velocity of 5 ft/s is sliding down a 30 degree slope before being slowed by a spring. What is the velocity of the block when the spring has been compressed 1 ft?
A heat pump is used to maintain a house at 22 C by extracting hear from the outside air on a day when the outside air temperature is 2 C. The house is estimated to lose heat at a rate of 110,000 kJ/
Determine (a) the exergetic effectiveness and (b) the exergy destroyed. The surrounds can be taken to be To= 20°C, Po = 100 kPa.