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The brake shoe and steel drum on a car continuously absorbs 25 W as the car slows down. Assume a total outside surface area of 0.1 m2 with a convective heat
The combustion of heptane C7H16 takes place in a SSSF burner where fuel and air are added as gases at Po
The compressor of a large gas turbine receives air from the ambient at 95 kPa, 20°C, with a low velocity
The density of atmospheric air is about 1.15 kg/m3, which we assume is constant. How large an absolute pressure will a pilot see when flying 1500 m
The COP of vapor-compression refrigeration cycles improves when the refrigerant is sub cooled before it enters the throttling valve.
The condenser in a refrigerator receives R-134a at 700 kPa, 50°C and it exits as saturated liquid at 25°C. The flow rate is 0.1 kg/s and the condenser
The drinking water needs of an office are met by cooling tab water in a refrigerated water fountain from 23 to 6°C at an average rate of 10 kg/h.
The air conditioner in a house or a car has a cooler that brings atmospheric air from 30oC to 10oC both states at 101 kPa.
The air conditioner in a car uses R-134a and the compressor power input is 1.5 kW bringing the R-134a from 201.7 kPa to 1200 kPa by compression.
The Airbus A-340 passenger plane has a maximum takeoff weight of about 260,000 kg, a length of 64 m, a wing span of 60 m, a maximum
The air in a room is at 1 atm, 32°C, and 60 percent relative humidity. Determine
The black grille on the back of a refrigerator has a surface temperature of 35°C with a total surface area of 1 m2.
The basic barometer can be used to measure the height of a building. If the barometric readings at the top and at the bottom of a building are 730 and 755 mm Hg
The basic barometer can be used as an altitude measuring device in airplanes. The ground control reports a barometric reading of 753 mm Hg
The barometer of a mountain hiker reads 930 m bars at the beginning of a hiking trip and 780 m bars at the end.
The average specific heat of the human body is 3.6 kJ/kg -c °C. If the body temperature of an 80-kg man rises from 37°C to 39°C during strenuous exercise
Steam is accelerated by a nozzle steadily from a low velocity to a velocity of 210 m/s at a rate of 3.2 kg/s. If the temperature and pressure of the steam
Steam is throttled from 8 MPa and 450°C to 6 MPa. Determine the wasted work potential during this throttling process. Assume the surroundings to be at 25°C
Steam leaves a power plant steam generator at 3.5 MPa, 400°C, and enters the turbine at 3.4 MPa, 375°C.
Steam is throttled from 9 MPa and 500°C to a pressure of 7 MPa. Determine the decrease in energy of the steam during this process.
Steam is generated in the boiler of a cogeneration plant at 10 MPa and 450°C at a steady rate of 5 kg/s. In normal operation, steam expands in a turbine
Steam is condensed at a constant temperature of 30°C as it flows through the condenser of a power plant by rejecting heat at a rate of 55 MW.
Steam is compressed by an adiabatic compressor from 0.2 MPa and 150°C to 2.5 MPa and 250°C at a rate of 1.30 kg/s. The power input to the compressor is.
Ten kilograms of water in a piston/cylinder setup with constant pressure is at 450°C and a volume of 0.633 m3. It is now cooled to 20°C.
The absolute pressure inside a tank is 0.4 bars, and the surrounding atmospheric pressure is 98 kPa. What reading would a bourdon gage mounted in the tank wall