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A rigid tank contains 1 kmol of Ar gas at 220 K and 5 MPa. A valve is now opened and 3 kmol of N2 gas is allowed to enter the tank at 190 K and 8 MPa.
A room contains air at 20°C and 98 kPa at a relative humidity of 85 percent. Determine
A room contains 60 kg of air at 100 kPa and 15°C. The room has a 250-W refrigerator (the refrigerator consumes 250 W of electricity when running)
A river flowing steadily at a rate of 240 m3/s is considered for hydroelectric power generation. It is determined that a dam can be built to collect water
A rigid insulated container has two rooms separated by a membrane. Room A contains 1 kg air at 200oC and room B has 1.5 kg air at 20oC, both rooms at 100 kPa
A rigid container, 10 m3 in volume, contains moist air at 45°C, 100 kPa, 40%. The container is now cooled to 5°C
The partition ruptures, and the nitrogen comes to a uniform state at 100°C. Assuming the surroundings are at 25°C find the actual heat transfer
Disregard other possible species and determine the final pressure, the equilibrium composition and the heat transfer for the process.
The partition wall is removed and the water comes to a uniform state, which after a while due to heat transfer has a temperature of 200°C.
A rigid tank contains 1.2 m3 of argon at -100°C and 1 MPa. Heat is now transferred to argon until the temperature in the tank rises to 0°C.
A rigid tank contains 0.5 kmol of Ar and 2 kmol of N2 at 250 kPa and 280 K. The mixture is now heated to 400 K. Determine the volume of the tank
A rigid insulated tank is separated into two rooms by a stiff plate. Room A of 0.5 m3 contains air at 250 kPa, 300 K and room B of 1 m3 has air at 150 kPa
A rigid tank contains 20 lbm of air at 20 psia and 70°F. More air is added to the tank until the pressure and temperature rise to 35 psia and 90°F, respectively
A rigid tank contains 20 lbm of air at 50 psia and 80°F. The air is now heated until its pressure doubles. Determine
A rigid tank contains 2 kmol of N2 and 6 kmol of CH4 gases at 200 K and 12 MPa. Estimate the volume of the tank
A rigid tank contains 1.5 kg of water at 120°C and 500 kPa. Now 22 kJ of shaft work is done on the system and the final temperature in the tank is 95°C
A refrigerator operates on the ideal vapor compression refrigeration cycle with R-134a as the working fluid between the pressure limits of 120 and 800 kPa.
A refrigerator has a second-law efficiency of 45 percent, and heat is removed from the refrigerated space at a rate of 200 Btu/min.
A refrigeration system is to cool bread loaves with pump-powered water heater has a COP of 2.2 but costs about an average mass of 450 g from 22 to -10°C
A refrigeration cycle is executed with R-134a under the saturation dome between the pressure limits of 1.6 and 0.2 MPa.
A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min to maintain its temperature at -8°C if the air surrounding the refrigerator
A refrigerator uses a power input of 2.5 kW to cool a 5°C space with the high temperature in the cycle as 50°C.
A refrigerator that operates on the ideal vapor compression cycle with refrigerant-134a is to maintain the refrigerated space at -10°C while rejecting heat
A refrigerator removes heat from a refrigerated space at 5°C at a rate of 0.35 kJ/s and rejects it to an environment at 20°C. The minimum required power input.
A refrigerator with R-12 as the working fluid has a minimum temperature of -10°C and a maximum pressure of 1 MPa.