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1) Air at the inlet of a nozzle is at 500 kPa, 42.2oC, and a velocity of 87 m/s. The nozzle exit pressure is at 132 kPa. Determine the nozzle exit velocity (m/s) if the adiabatic efficiency is 88.2%. Assume constant specific heats evaluated at 300 K (Cp = 1.005 kJ/kg-K, Cv = 0.718, and k = 1.4).
2) Air at the inlet of an ideal (reversible-adiabatic) compressor enters through a 0.037 m2 pipe at 141 kPa. The compressor exit pressure is at 540 kPa. Calculate the area (cm2) of the exit pipe if the inlet and exit velocities are equal. Assume constant specific heats evaluated at 300 K.
3) An insulated mixing box in an air-conditioning system is used to mix two streams of refrigerant R134a to produce a single stream. The pressure of each stream is 6 bar. Inlet 1 is a saturated vapor with a flow rate of 0.34 kg/s, and inlet 2 is at 40oC with a flow rate of 0.242 kg/s. Determine the rate of entropy production in the mixing box (kW/K). Assume steady state operating conditions.
a tube with elastic modulus of 75 gpa is used to support a compressive load. it is required that this tube must not
Determine the mass flow rate of the air passing through this engine and the rates of heat addition and rejection when this engine produces 1000 hp. Assume constant specific heats at room temperature.
a construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft
a 10 kw electric heater is used to heat 2 kg of air contained in an insulated rigid tank from 400 kpa and 50 degc to
consider a cold canned drink left on a dinner table. would you model the heat transfer to the drink as one two or three
water flows through a 60 mm diameter tube that suddenly contracts to 30 mm diameter. the pressure drop across the
a baloon rises with a constant velocity.a load is tied by a rope to the basket. when the baloon is at altitude h0 the
small objects are delivered to the 72-in. inclined chute by a conveyor belt a which moves at a speed v1 1.2 ftsec. if
B) Determine the minimum amount of work [kJ ] required to reach this end state. C) If more than the minimum work is actually used, where does this extra energy go? That is what becomes of the extra energy?
three monkeys a b and c weighing 23 23 and 20 lb respectively are climbing up and down the rope suspended from d. at
Derive at least four concept designs to satisfy the given specification - draw a central cross-section of the heat exchanger
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