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Can moist air below the freezing point, say -5oC, have a dew point? Why does a car with an air conditioner running often have water dripping out?
Develop a formula to show how the mass fraction of water vapor is connected to the humidity ratio.
Flow of 1 kg/s argon at 300 K and another flow of 1 kg/s carbon dioxide at 1600 K, both at 150 kPa, are mixed. Find the exit T, P using variable specific heats.
Use constant heat capacity to find the mixing chamber's exit temperature and the needed compressor power.
The piston now compresses the mixture to half of its initial volume. Find the final pressure, temperature, and the piston work.
If the pressure before compression and after heat rejection is 100 kPa, find the high temperature and the pressure just before heat addition.
Compute the work and heat transfer in all of the four processes per kilogram of helium and the thermal cycle efficiency.
Consider an ideal air-standard diesel cycle in which the state before the compression process. Find the thermal efficiency for a maximum temperature of 2000 K.
Assume an inlet state of 200 kPa, 300 K and a compression ratio of 20:1. What is the mean effective pressure and the flow rate of air to the engine?
A Rankine steam power plant should operate with a high pressure of 3 MPa. Find the maximum water mass flow rate possible and the air exit temperature.
Calculate the power output of the turbine, the fraction of the turbine output required to drive the compressor, and the thermal efficiency of the cycle.
Find the temperature after combustion and the specific energy release by combustion in Problem 10.98 using cold air properties.
At beginning of compression in a diesel cycle, T = 540 R, P = 30 lbf/in.3. Find the compression ratio, the thermal efficiency, and the mean effective pressure.
Compute the maximum pressure and temperature and the thermal efficiency of this cycle.
A four-stroke gasoline engine runs at 1800 RPM with a total displacement of 3 L and a compression ratio of 10:1. Find the cycle efficiency and power output.
If the nozzle efficiency is 95%, determine the temperature and velocity exiting the nozzle at state 5.
Air exits the intercooler at 330 K. Calculate the temperature at the exit of each compressor stage and the total specific work required.
Compute the power output of the turbine. What fraction of the turbine output is required to drive the compressor? What is the thermal efficiency of the cycle?
Find the combined specific work to the compressor stages. Compare that to the specific work for the case of no intercooler.
Calculate the power output of the turbine. What fraction of the turbine output is required to drive the compressor? What is the thermal efficiency of the cycle?
Use cold air properties (i.e., constant heat capacities at 300 K) and find the compression ratio, the compression specific work, and highest pressure in cycle.
The combustion generates a peak pressure of 5500 kPa. Find the peak temperature, the energy added by the combustion process, and the exhaust temperature.
Find the highest T and P in the cycle, the specific heat transfer added, the cycle mean effective pressure and the total power produced.
Find the temperature after combustion using cold air properties. Find the volumetric compression ratio and the thermal efficiency.
An ideal regenerator is also incorporated into the cycle. Find the thermal efficiency of the cycle using cold air (298 K) properties.