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The valve is opened and remains open until the resulting gas mixture comes to a uniform state. Compute the final pressure and temperature.
What is the overall molecular weight, the gas constant, and the ratio of specific heats for such a mixture?
Sketch a setup to accomplish this, and find any amount of liquid (at 68 F) that is needed or discarded, and any heat transfer.
The system is cooled until the water just begins to condense. Determine the final temperature in the tank and the heat transfer for the process.
If I have air at 14.7 psia and (a) 15 F, (b) 115 F, and (c) 230 F, what is the maximum absolute humidity I can have?
What is the ratio of the two flow rates? To what temperature must the first stream be cooled?
All the water evaporates, and the air leaves at 40oC. What is the exit relative humidity and the heat transfer?
Ambient moist air enters a steady-flow air conditioning unit at 102 kPa, 30oC, with 60% relative humidity. Determine the rate of heat transfer for this process.
What is the dew-point temperature? If the mixture is cooled 10oC below the dew-point temperature, how long will it take to collect 10 kg of liquid water?
Find the exit moist air humidity ratio and the flow rate of liquid water. Also find the dry air inlet temperature T1.
If I have air at 100 kPa and (a) -10oC, (b) 45oC, and (c) 110oC, what is the maximum absolute humidity I can have?
A flow of 1 kg/s saturated moist air at 100 kPa, 10oC goes through a heat exchanger. What are the exit relative humidity and the heat transfer?
All flows are at 150 kPa, the same as the total exit pressure. Compute the exit temperature and the rate of entropy generation in the process.
Any heat transfer is with the surroundings at 20oC. Is an electrical power input of 3000 kW sufficient to drive this unit?
Find the exit temperature and the rate of entropy generation. Find the exit temperature and the total entropy generation per kilogram of the exit mixture.
Find any flow of liquid and the necessary heat transfer, both per kilogram of dry air flowing. Find the dew point for the final mixture.
The remaining liquid water flows back to the condenser at 30oC, having given off 1 MW. Find the mass flow rate of air and the amount of water that evaporates.
Find the temperature T2, the mass of liquid per kilogram of dry air, and the overall heat transfer rate.
Find the dew point of the inside air, the relative humidity at the end of the channel, and the heat transfer in the channel.
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.