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The gas space above the water in a closed storage tank contains nitrogen at 80 F, 15 lbf/in 2. Total tank volume is 150 ft3 and there is 1000 lbm
The front of a jet engine acts as a diffuser receiving air at 900 km/h, -5°C, 50 kPa, bringing it to 80 m/s relative to the engine
The label on a washing machine indicates that the washer will use $85 worth of hot water if the water is heated by a 90 percent efficient electric heater
The inner and outer glasses of a 2-m x 2-m double pane window are at 18°C and 6°C, respectively.
The hot-water needs of a household are to be met by heating water at 55°F to 180°F by a parabolic solar collector at a rate of 4 lbm/s.
The hot exhaust gas from an internal combustion engine is analyzed and found to have the following percent composition on a volumetric basis at the engine
The high-temperature heat source for a cyclic heat engine is a SSSF heat exchanger where R-134a enters at 80°C, saturated vapor, and exits at 80°C
The early steam engines were driven by the atmospheric pressure acting on the piston fitted into a cylinder filled with saturated steam.
The dry- and wet-bulb temperatures of atmospheric air at 95 kPa are 25 and 17°C, respectively. Determine
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.