Pb_3.128
Liquid propane is commonly used as a fuel for heating homes, powering vehicles such as forklifts, and filling
portable picnic tanks. Consider a propane tank that initially contains 5 L of liquid propane at the environment temperature of 20°C. If a hole develops in the connecting tube of a propane tank and the propane starts to leak out, determine the temperature of propane when the pressure in the tank drops to 1 atm. Also, determine the total amount of heat transfer from the environment to the tank to vaporize the entire propane in the tank.
Pb_3.75
The pressure in an automobile tire depends on the temperature of the air in the tire. When the air temperature is
25°C, the pressure gage reads 210 kPa. If the volume of the tire is 0.025 m^3, determine the pressure rise in the tire when the air temperature in the tire rises to 50°C. Also, determine the amount of air that must be bled off to restore pressure to its original value at this temperature. Assume the atmospheric pressure is 100 kPa.
Pb_3.97
Methane at 8 MPa and 300 K is heated at constant pressure until its volume has increased by 50%. Determine the final temperature using the ideal gas equation of state and the compressibility factor. Which of these two results is more accurate?
Pb_3.94
Carbon dioxide gas enters a pipe at 3 MPa and 500 K at a rate of 2 kg/s. CO2 is cooled at constant pressure as it
flows in the pipe and the temperature CO2 drops to 450 K at the exit. Determine the volume flow rate and the density of carbon dioxide at the inlet and the volume flow rate at the exit of the pipe using (a) the ideal-gas equation and (b) the generalized compressibility chart. Also, determine (c) the error involved in each case.
Pb_3.108
The combustion in a gasoline engine may be approximated by a constant volume heat addition process. There
exists the air–fuel mixture in the cylinder before the combustion and the combustion gases after it, and both may be approximated as air, an ideal gas. In a gasoline engine, the cylinder conditions are 1.8 MPa and 450°C before the combustion and 1300°C after it. Determine the pressure at the end of the combustion process.
Answer: 3916 kPa
Pb_3.110
Carbon dioxide gas at 3 MPa and 500 K flows steadily in a pipe at the rate of 0.4 kmol/s. Determine (a) the volume and mass flow rates and the density of the gas at this state. If CO2 is cooled at constant pressure as it flows in the pipe so that the temperature of CO2 drops to 450 K at the exit of the pipe. Determine (b) the volume flow rate at the exit of the pipe.