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In large steam power plants, the feedwater is frequently heated in closed feedwater heaters, which are basically heat exchangers, by steam extracted
In large compressors, the gas is frequently cooled while being compressed to reduce the power consumed by the compressor
In a heat-driven refrigerator with ammonia as the working fluid, a turbine with inlet conditions of 2.0 MPa, 70°C is used to drive a compressor
In a heat pump that uses R-134a as the working fluid, the R-134a enters the compressor at 150 kPa, -10°C at a rate of 0.1 kg/s
In a glass factory a 2 m wide sheet of glass at 1500 K comes out of the final rollers that fix the thickness at 5 mm with a speed of 0.5 m/s.
In a gas-fired boiler, water is boiled at 150°C by hot gases flowing through a stainless steel pipe submerged in water
In a movie theater in winter, 500 people, each generating sensible heat at a rate of 70 W, are watching a movie.
In a jet engine a flow of air at 1000 K, 200 kPa and 30 m/s enters a nozzle, where the air exits at 850 K, 90 kPa
In a jet engine a flow of air at 1000 K, 200 kPa and 40 m/s enters a nozzle where the air exits at 500 m/s, 90 kPa. What is the exit temperature
In a hot and dry climate, air enters an air-conditioner unit at 100 kPa, 40°C, and 5% relative humidity, at the steady rate of 1.0 m3/s.
In a heating system, cold outdoor air at 10°C flowing at a rate of 6 kg/min is mixed adiabatically with heated air at 70°C flowing at a rate of 3 kg/min.
If the variation of the acceleration with gravity, in m/s^2, with elevation z, in m, above sea level is g=9.81 - (3.3*10^-6)z, determine the percent change
In a rocket, hydrogen is burned with air, both reactants supplied as gases at Po, To. The combustion is adiabatic and the mixture is stoichiometric
In a refrigerator, heat is transferred from a lower temperature medium (the refrigerated space) to a higher temperature one (the kitchen air).
In a particular reheat-cycle power plant, steam enters the high-pressure turbine at 5 MPa, 450°C and expands to 0.5 MPa, after which it is reheated to 450°C.
If density of ice is 920 kg/m3, find the pressure at the bottom of a 1000 m thick ice cap on the North Pole. What is the melting temperature at that pressure?
Hydrogen peroxide, H2O2, enters a gas generator at 25°C, 500 kPa at the rate of 0.1 kg/s and is decomposed to steam and oxygen exiting at 800 K, 500 kPa.
Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft3. At this state, a linear spring (F 8 x) with a spring constant of 15,000 lbf/ft
In a car's defrost/defog system atmospheric air, 21°C, relative humidity 80%, is taken in and cooled such that liquid water drips out
In 2001, the United States produced 51 percent of its electricity in the amount of 1.878 = 1012 kWh from coal fired power plants.
If the efficiency of a power plant goes up as the low temperature drops why not let the heat rejection go to a refrigerator at say -10oC instead of ambient 20oC
How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid?
How does the COP of a cascade refrigeration system compare to the COP of a simple vapor-compression cycle operating between the same pressure limits?
In a combustion process with decane, C10H22, and air, the dry product mole fractions are 86.9% N2, 1.163% O2, 10.975% CO2 and 0.954% CO
In a combustion chamber, ethane (C2H6) is burned at a rate of 8 kg/h with air that enters the combustion chamber at a rate of 176 kg/h