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The ducts of an air heating system pass through an unheated area. As a result of heat losses, the temperature of the air in the duct drops by 4°C.
The effect of a number of open feedwater heaters on the thermal efficiency of an ideal cycle is to be studied. Steam leaves the steam generator at 20 MPa, 600°C
The density of atmospheric air varies with elevation, decreasing with increasing altitude.
The coal gasifier in an integrated gasification combined cycle (IGCC) power plant produces a gas mixture with the following volumetric percent composition:
The components of an electronic system dissipating 180 W are located in a 1.4-m-long horizontal duct whose cross section is 20 cm = 20 cm.
The cargo space of a refrigerated truck whose inner dimensions are 12 m x 2.3 m x 3.5 m is to be precooled from 25°C to an average temperature of 5°C
The boiling temperature of water decreases by about 3°C for each 1000-m rise in altitude. What is the decrease in the boiling temperature
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