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Consider the 2D inviscid flow over a body of some known shape. Write down general expressions for the total aerodynamic force(per unit depth perpendicular to the plane)
Consider entropy balance equation for human engines. Humans loose heat at the rate of 80 W from the body which is uniformly at 37 C. Calculate entropy generated within human body in W/K.
Calculate the Nusselt number and the convective heat transfer coefficient for water at a bulk temperature of 32oC flowing at a velocity of 1.5 m/s through a duct of 25.4 mm inside diameter.
Calculate the friction factor and the heat transfer coefficient assuming the flow is both hydrodynamically and thermally fully developed. Evaluate air properties at 350 K.
Compare calculated tensile stress with allowable tensile stress and find the absolute value of elongation of the rod for the stress equal to allowable.
Assume MACRS depreciation for the special tools and a 39% income tax rate. If the company wants a 12% after-tax rate of return, is this a desirable investment?
Neglecting changes in kinetic and potential engery and assuming steady state operation, determine the river water temperature downstream of the plant, in degrees C.
The valve is opened long enough to fill the tank to a pressure of 500 psia. Determine; The final temperature of the steam in the tank, in degrees F.
An iron-carbon alloy gear is being hardened by carburization at 1000oC. Calculate the time in hours necessary to increase the carbon content to 0.45 wt% at 2 mm below the surface.
The concentration of hydrogen on the other side of the membrane is 9.93 x 10-6 wt%. Calculate the concentrations of hydrogen in the iron on both sides of the membrane in kgm-3.
The ratio of the exit area to the inlet is 8. Assuming the ideal gas model for air and using variable specific heats, determine: the temperature at the exit, in degrees R.
Assuming the air behaves as an ideal gas with cp=1.005 KJ/kg*K, determine the mass flow rate of air, in kg/min. Kinetic and potential energy effects are negligble.
If the house were heated instead by a heat pump with a COP of 2.4, how much money would the homeowner have saved in that month assuming 8.5 cents/kWh for electricity?
Plot the maximum efficiency of a nuclear power plant as a function of the maximum allowable temperature in the reactor core.
The high-temperature source is a 400 degree celcius boiler, and the temperature of the river water is 10 degrees celcius. Find the rate of heat transfer to the river and the ideal thermal efficiency
Find (a) condensing surface area required, (b) circulating water flow rate in kg/s, (c) the number of tubes and (d) the length of tubes. The data: Mean water velocity 1.5 m/s.
Determine the steady state rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 21C while the temperature o
If the isentropic efficiency of the compressor is 80%, determine (a) the exit temperature of the argon and (b) the work input to the compressor.
It bums in a steam generator with 115 percent theoretical air. Calculate the minimum stack temperature if the fuel gases leaving the air preheater are at 15 psia.
Find the pressure with which the water is fed into the nozzle. You may assume that the jet of water is not affected by friction once it has left the nozzle
The maximum temperature is 1200k and minimum is 290k the minimum pressure is 95 kpa and the maximum pressure is 380kpa determine the fraction of the turbine output used to drive the compressor.
A gas turbine power plant operates on the simple brayton cycle between Tmin=300k and Tmax=1073 k. Find the maximum work done per kg of air and efficincy.
Take cut off ratio = 2. Find the temperature after the end of each stroke and calculate the efficiency of the cycle. Also give the formula for mean effective pressure.
Calculate the percent energy distribution in a steam generator that goes into steam, losses to flue gases, refuse and heat losses. The steam generator receives 480 short tons of coal per day.