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air at 300 k and 100 kpa steadily flows into a hair dryer having electrical work input of 1500 w because of the size of
1 saturated liquid water is heated at constant pressure in a steady-flow device until it is a saturated vapor calculate
1 steam enters a long horizontal pipe with an inlet diameter of d1 16 cm at 2 mpa and 300degc with a velocity of 25 ms
a house has an electric heating system that consists of a 300-w fan and an electric resistance heating element placed
the hot-water needs of a household are to be met by heating water at 55degf to 180degf by a parabolic solar collector
a long roll of 2-m-wide and 05-cm-thick 1-mn manganese steel plate rho 7854 kgm3 and cp 5 0434 kjkgmiddotdegc coming
a computer cooled by a fan contains eight pcbs each dissipating 10 w power the height of the pcbs is 12 cm and the
consider a hollow-core printed circuit board 9 cm high and 18 cm long dissipating a total of 15 w the width of the air
1 air enters a pipe at 65degc and 200 kpa and leaves at 60degc and 175 kpa it is estimated that heat is lost from the
1 nitrogen gas flows through a long constant-diameter adiabatic pipe it enters at 100 psia and 1208f and leaves at 50
1 saturated refrigerant-134a vapor at 34degc is to be condensed as it flows in a 1-cm-diameter tube at a rate of 01
a 2-ft3 rigid tank contains saturated refrigerant- 134a at 160 psia initially 5 percent of the volume is occupied by
a 03-m3 rigid tank initially contains refrigerant- 134a at 14degc at this state 55 percent of the mass is in the vapor
a balloon that initially contains 50 m3 of steam at 100 kpa and 150degc is connected by a valve to a large reservoir
1 an insulated 015-m3 tank contains helium at 3 mpa and 130degc a valve is now opened allowing some helium to escape
a vertical piston-cylinder device initially contains 02 m3 of air at 20degc the mass of the piston is such that it
a vertical piston-cylinder device initially contains 025 m3 of air at 600 kpa and 300degc a valve connected to the
a vertical piston-cylinder device initially contains 001 m3 of steam at 200degc the mass of the frictionless piston is
the air in an insulated rigid compressed-air tank whose volume is 05 m3 is initially at 4000 kpa and 20degc enough air
1 the air in a 6-m times 5-m 3 4-m hospital room is to be completely replaced by conditioned air every 15 min if the
1 air at 418 kgm3 enters a nozzle that has an inletto-exit area ratio of 21 with a velocity of 120 ms and leaves with a
a 03-m3 rigid tank is filled with saturated liquid water at 200degc a valve at the bottom of the tank is opened and
a 006-m3 rigid tank initially contains refrigerant-134a at 08 mpa and 100 percent quality the tank is connected by a
oxygen is supplied to a medical facility from ten 15-ft3 compressed oxygen tanks initially these tanks are at 1500 psia
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