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The outdoor ambient is at 10oC, 100 kPa, 50% relative humidity. What are the required liquid water input and heat transfer rates for this purpose?
Neglect the volume of any liquid that might be present and find the final mass of water vapor, the final total pressure, and the heat transfer.
Find the temperature and relative humidity after mixing. Find the heat transfer and the final exit relative humidity.
Find the dew point of the atmospheric air, specific humidity of air onto the windshield, the lowest temperature, and the specific heat transfer in the cooler.
An air conditioner for an airport receives desert air at 45oC, 10% relative humidity. What should be done to air? Find needed heating/cooling per kg dry air.
For each case, explain what happens to the exergy, whether there is any exergy destruction, and whether the composition is needed.
Find the specific and relative humidity for state 1 the dew point for state 2, and the heat transfer per kg dry air in each component in the system.
For both cases, find the exit relative humidity and the amount of heat transfer per kilogram of dry air.
Explain how to meter the inlet flows to ensure the proper ratio, assuming inlet pressures are equal to the total exit pressure and all temperatures are the same
Explain in words what the absolute and relative humidity express. In which direction does an adiabatic saturation process change F, ?, and T?
What happens to relative and absolute humidity when moist air is heated? What happens to relative and absolute humidity when moist air is cooled?
Are the mass and mole fractions for a mixture ever the same? For a mixture, how many component concentrations are needed?
Find the fuel fraction on a mass basis and the fuel mass for a chamber that is 0.5 L at 800 K and has a total pressure of 4000 kPa.
For that time, find the partial pressure of the octane and the specific volume of the mixture.
A slightly oxygenated air mixture is 69% N2, 1% Ar, and 30% O2 on a mole basis. Find the mass fraction of oxygen and its partial pressure.
A mixture of 60% N2, 30% Ar, and 10% O2 on a mass basis is in a cylinder at 250 kPa, 310 K. Find the mole and the mass fractions and the mass of argon.
A 3-L liquid mixture is one-third each of water, ammonia, and ethanol by volume. Find the mass fractions and total mass of the mixture.
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.