Two engineers A and B are given identical samples of 1 kg air at 100 kPa...

Two engineers A and B are given identical samples of 1 kg air at 100 kPa pressure and 300 K temperature. They are both asked to compress the air in order to raise the pressure to 800 kPa and reduce the volume to one-fifth of the initial volume. Engineer A chooses to compress the air isothermally until the pressure reaches 500 kPa, and then further increase the gas pressure in an isochoric process until the desired pressure is reached. On the other hand, Engineer B chooses to increase the gas pressure isochorically until the pressure reaches 800 kPa, and then reduce the volume at constant pressure in order to reach the desired final state. (a) On a p-V diagram, please show the processes followed by Engineers A and B. (b) Please calculate the work done, heat transferred and change in internal energy for the processes followed by Engineers A and B. Please record your answers in the following Table. For heat transferred, please specify the direction of heat transfer, and for work done, please specify whether work was done on or by the gas.

Solutions

Expert Solution

genius_generous answered 1 year ago

Next > < Previous

Related Solutions

A mass of 0.07 kg of air at a temperature of 30°C and pressure 100 kPa...

A mass of 0.07 kg of air at a temperature of 30°C and pressure 100 kPa is compressed to a pressure of 600 kPa, according to the law: (i.e. Polytropic process, n=1.3). Determine: i.The final volume ii.The final temperature iii.The work transfer iv.The change in internal energy v.The heat transfer

Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The...

Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The temperature at the inlet to the first turbine stage is 1400 K. The expansion takes place isentropically in two stages, with reheat to 1400 K between the stages at a constant pressure of 300 kPa. A regenerator having an effectiveness of 100% is also incorporated into the cycle. The turbine and the compressor each have am isentropic efficiency of 80%. Determine the following: (a.)...

One kg de air initially at 300 K and 100 kPa undergoes a quasi-equilibrium constant-pressure process...

One kg de air initially at 300 K and 100 kPa undergoes a quasi-equilibrium constant-pressure process in a piston-cylinder assembly. If the final temperature is 450 K, determine the work and heat interactions and the change in the enthalpy.

Air enters the compressor of an ideal air standard Brayton cycle at 100 kPa and 290...

Air enters the compressor of an ideal air standard Brayton cycle at 100 kPa and 290 K with a mass flow rate (m⋅) of 6 kg/s. The compressor pressure ratio is 10. The turbine inlet temperature is 1500 K. If a regenerator with an effectiveness of 70% is incorporated in the cycle, determine (a) the thermal efficiency (ηth,Brayton) of the cycle. Use the PG model for air. (b) What-if Scenario: What would the thermal efficiency be if the regenerator effectiveness...

1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100 kPa and...

1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100 kPa and leaves at P2 = 105 kPa. You may assume an adiabatic diffuser and constant specific heats. Find T2 if: a) V1 = 10 m/s, V2 = 0 m/s b) V1 = 100 m/s, V2 = 90 m/s c) V1 = 500 m/s, V2 = 490 m/s d) V1 = 1000 m/s, V2 = 990 m/s

Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with...

Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with a volumetric flow rate of 5 m3/s. The turbine inlet temperature is 1800 K. For a compressor pressure ratio of 9, determine: (a) the percent thermal efficiency of the cycle. (b) the back work ratio. (c) the net power developed, in kW.

4.65 A system consisting of 5 kg of air is initially at 300 kPa and 20...

4.65 A system consisting of 5 kg of air is initially at 300 kPa and 20 degrees C. Determine the heat transfer necessary to (a) increase the volume by a factor of two at constant pressure, (b) increase the pressure by a factor of two at constant volume, (c) increase the pressure by a factor of two at constant temperature, and (d) increase the absolute temperature by a factor of 2 at constant pressure.

One hundred moles of moist air (100 moles) at 25oC and 100 kPa has a dew...

One hundred moles of moist air (100 moles) at 25oC and 100 kPa has a dew point of 16oC. If you want to remove 50% of the initial moisture in the air (at a constant pressure of 100 kPa). 1. Sketch the process. 2. Determine to what temperature should you cool the air? Assume that after removal of 50% of moisture from the air, the final air is saturated.

Air enters the compressor of an ideal cold air-standard Brayton cycle at 100 kPa, 300 K,...

Air enters the compressor of an ideal cold air-standard Brayton cycle at 100 kPa, 300 K, with a mass flow rate of 6 kg/s. The compressor pressure ratio is 10, and the turbine inlet temperature is 1400 K. For k = 1.4 and Cp = 1.005 kJ/kg, calculate: (a) the percent thermal efficiency of the cycle. (b) the back work ratio. (c) the net power developed, in kW

A jet propulsion engine has an air that enter the compressor at 100 kPa and 290K....

A jet propulsion engine has an air that enter the compressor at 100 kPa and 290K. The pressure ratio across the compressor is 14 and the turbine inlet temperature is 1500K. When the air leaves the turbine, it enters the nozzle and expands to 100kPa. Determine the pressure at the nozzle inlet and the velocity of the air leaving the nozzle Important notes: Please be neat and write legibly, it’s important that I understand your writing and follow your thoughts....

Subjects