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A neighborhood fuel cell power plant is to be designed for an electric power output of 2000 kW with liquid-water product. Estimate the flow rates of hydrogen and oxygen during peak power production, assuming an 80% efficient power conditioner is used to convert DC to AC power and the fuel cell efficiency is 55%. What is the plant heat rate?
A 0.025 m thick flat plate having a 20 cm X 20 cm cross section is made of plain carbon steel (k=30 W/mC), alpha=32.7 x10^-7m^2/s). The initial plate temperature is 727C. it is cooled by blowing 27C air over the top surface of the plate at 30 m/s; th..
A typical gas stove burner supplies a kettle filled with water at a rate of 15,000 Btu/hr with a flame temperature of 750C. The gas fed to the burner is composed of propane mixed with 10% excess air. The gas feed is initially at -20C and 1 bar and th..
100 lbm of water at 500 psi occupies 1.6 ft3. it undergoes a constant pressure process until the temperature is 600
The static equilibrium position of a mass less rigid bar hinged at point O and connected with spring's k1 and k2 is shown. Assuming that the displacement results from the application of a force F at a point A, find the equivalent spring constant of ..
Steam enters a turbine operating at steady state at 4 MPa, 500°C with a mass flow rate of 50 kg/s. Saturated vapor exits at 10 kPa and the corresponding power developed is 42 MW. The effects of motion and gravity are negligible.
A 7in diameter cylindrical scuba tank made from steel is being designed for an internal pressure of 1600 psi. The allowable stress of the steel is 35 ksi in tension and 16 ksi in shear. Calculate the minimum wall thickness assuming a factor of safety..
pin a which is attached to link ab is constrained to move in the circular slot cd. knowing that at t0 the pin starts
a cylinderpiston arrangement contains water at 105 c 85quality with a volume of 1l. the system is heated causing the
a thin-walled pipe of d 20 mm internal diameter is subjected to a constant heat flow on the surface of strength q400 w
What is the average velocity if the diameter changes to 6 in.? b. Express the average velocity in terms of an arbitrary diameter.
the 50-kg homogeneous smooth sphere rest on the 30 degree incline A and bears against the smooth vertical wall B. calculate the contact forces at A and B.
a 2014-t6 aluminum spar in an airframe is expected to support an alternating load ranging between 32 kn and -32 kn at a
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