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Liquid water at 120°F and a mass flow rate of 3 ×105 lb/h enters a cooling tower operating at steady state. Liquid water exits the tower at 80°F. No makeup water is provided. Atmospheric air enters at 1 atm with a dry-bulb temperature of 70°F and a wet-bulb temperature of 60°F. Saturated air exits at 110°F, 1 atm. Ignoring kinetic and potential energy effects, determine the mass flow rate of the cooled water stream exiting the tower, in lb/h.
Water flows through a horizontal plastic pipe with a diameter of .2 m at a velocity of 10 cm/s. determine the pressure drop per meter of pipe using the Moody chart.
Experiments have shown that, for airflow at T8 = 35°C and V1 = 100 m/s, the rate of heat transfer from a turbine blade of characteristic length L1 = 0.15 m and surface temperature Ts, 1 = 300°C is q1 = 1500 W.
a steam power plant uses an ideal rankine cycle. superheated vapor enters the turbine at 8 mpa 480c. the condenser
an engineer is making an estimate for a home owner. this owner has a small stream of water q1.4cfs t40cthat is located
a gas is contained in a vertical piston-cylinder arrangement. the 50-lbm piston initially rests on the bottom stops.
a motorcycle is moving at 30 ms when the rider applies the brakes giving the motorcycle a constant deceleration. during
A piston-cylinder assembly initially contains 4 mol of substance X in vapor phase at 0.8 bar and 373 K. The vapor is compressed isothermally and reversibly until the first droplet of liquid forms.
Calculate the work done and the final temperature for the following processes: Polytropic, n = 1.1, 4.0 lbm of Air, T1 = 1300 °F, v1=6.519 ft3/lbm. The pressure decreases to half the initial pressure during the process.
air is used in a carnot cycle as a working substance . determine the efficiency of the cycle if as a result of an
a steel railroad track es200 gpa as11.7x10-6oc was laid out at a temperature of 6oc. determine the normal stress in the
At steady state, a heat pump driven by an electric motor maintains the interior of a building at Th=293 K. The rate of heat transfer, in kJ/h, from the building through its walls and roof is given by 8000(Th-Tc), where Tc is the outdoor temperature.
the crate has a mass of 150kg and the coefficients of friction between it and the sloping dock are mus 0.5 and muk
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