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Air is compressed in an axial-flow compressor operating at steady state from 27°C, 1 bar to a pressure of 2.1 bar. The work required is 94.6 kJ per kg of air flowing. Heat transfer from the compressor occurs at an average surface temperature of 40°C at the rate of 14 kJ per kg of air flowing. The effects of motion and gravity can be ignored. Let T0 5 20°C, p0 5 1 bar. Assuming ideal gas behavior, determine (a) the temperature of the air at the exit, in °C, and (b) the rate of exergy destruction within the compressor, in kJ per kg of air flowing.
a group of students launches a model rocket in the vertical direction. based on tracking data they determine that the
a projectile is fired at an angle of 62deg from the horizontal with a velocity of 704 ftsec. if it lands 4.75 seconds
air at 1 atm and 300 k with a flow rate of 0.2 kgs enters a rectangular 10-by-20-cm duct that is 250 cm long. if the
a longitudinal aluminum fin k 230 wmk is attached to a copper tube having an outside radius of 0.04m. the length of
an alcohol manufacturing facility emits air with 500 ppm ethanol. the air flows out several roof vents at a total flow
A car is driven along a straight track with position given by s(t) = 150t – 300 ft (t in seconds). Find v(t) and a(t). Use calculus to find the displacement and total distance traveled over the interval [1, 4].
refrigerant-134a at 240 kpa and 20c undergoes an isothermal process in a closed system until its quality is 20 percent.
The rear window of an automobile is defogged by attaching a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uniform heat flux may be established at the inner surface. The interior air tempera..
a rigid tank is divided into two equal parts by a partition. one part of the tank contains 3.1 kg of compressed liquid
Estimate the concentration (in ppm) and the mass emission rate of NOx (in kg/hr, expressed as NO) if a coal containing 1.5% nitrogen is combusted at 1400 K using an air/fuel ratio that is 1.5 times the stoichiometric ratio.
In theoretical (ideal) single-stage ammonia vapor-compression system, liquid leaves the condenser at 250 psia and 104 °F. Evaporator pressure is 18.30 psia. Vapor leaves the evaporator at 0°F. The system produces 25 tons of refrigeration.
a pitot-static tube measures the stagnation and static pressure of air at 8.5 and 1.5 of h2o respectively. what is the
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