Q: Refrigerant-134a enters an adiabatic compressor at 15 psia and 20
Refrigerant-134a enters an adiabatic compressor at 15 psia and 20°F with a volume flow rate of 10 ft3/s and leaves at a pressure of 100 psia. The power input to the compressor is 45 hp. Fin...
See AnswerQ: A manometer is used to measure the air pressure in a tank
A manometer is used to measure the air pressure in a tank. The fluid used has a specific gravity of 1.25, and the differential height between the two arms of the manometer is 28 in. If the local atmos...
See AnswerQ: Nitrogen gas flows through a long, constant-diameter adiabatic pipe
Nitrogen gas flows through a long, constant-diameter adiabatic pipe. It enters at 100 psia and 120°F and leaves at 50 psia and 70°F. Calculate the velocity of the nitrogen at the pipe’s inlet and out...
See AnswerQ: A 110-V electric water heater warms 0.1 L
A 110-V electric water heater warms 0.1 L/s of water from 18 to 30°C. Calculate the current in amperes that must be supplied to this heater.
See AnswerQ: A fan is powered by a 0.5-hp motor
A fan is powered by a 0.5-hp motor and delivers air at a rate of 85 m3/min. Determine the highest value for the average velocity of air mobilized by the fan. Take the density of air to be 1.18 kg/m3....
See AnswerQ: Steam enters a long, insulated pipe at 1200 kPa, 250
Steam enters a long, insulated pipe at 1200 kPa, 250°C, and 4 m/s, and exits at 1000 kPa. The diameter of the pipe is 0.15 m at the inlet, and 0.1 m at the exit. Calculate the mass flow rate of the st...
See AnswerQ: Steam enters a nozzle with a low velocity at 150°C
Steam enters a nozzle with a low velocity at 150°C and 200 kPa, and leaves as a saturated vapor at 75 kPa. There is a heat transfer from the nozzle to the surroundings in the amount of 26 kJ for every...
See AnswerQ: Consider a heat exchanger that uses hot air to heat cold water
Consider a heat exchanger that uses hot air to heat cold water. Air enters this heat exchanger at 20 psia and 200°F at a rate of 100 ft3/min and leaves at 17 psia and 100°F. Wate...
See AnswerQ: Steam at 40°C condenses on the outside of a 5
Steam at 40°C condenses on the outside of a 5-m-long, 3-cm-diameter thin horizontal copper tube by cooling water that enters the tube at 25°C at an average velocity of 2 m/s and...
See AnswerQ: In large steam power plants, the feedwater is frequently heated in
In large steam power plants, the feedwater is frequently heated in a closed feedwater heater by using steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1 MPa and 200...
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