One-quarter kilogram of air is compressed in a piston-cylinder device from 350 K and 150 kPa...

One-quarter kilogram of air is compressed in a piston-cylinder device from 350 K and 150 kPa to 550 K and 900 kPa. Determine

a. The entropy change, in KJ/K.

b. The direction of any heat transfer by using the entropy balance.

c. What-if scenario: If this process occurs adiabatically, is this process reversible, irreversible, or impossible process? Please answer the nature of this process and why.

Expert Solution

samet mamat answered 2 years ago

Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa...

Air of 0.5 kg mass is compressed in a piston-cylinder device from 300 K, 120 kPa to 500K, 940 kPa. (a) Determine the entropy change in kJ/K using (i) approximate analysis and (ii) exact analysis. (b) Determine the direction of heat transfer (into the device or out of the device).

One kilogram of water is contained in a piston-cylinder device at 100 degC. The piston rests...

One kilogram of water is contained in a piston-cylinder device at 100 degC. The piston rests on lower stops such that the volume occupied by the water is 0.835 m3. The cylinder is fitted with an upper set of stops. When the piston rests against the upper stops, the volume enclosed by the piston-cylinder device is 0.841 m3. A pressure of 200 kPa is required to support the piston. Heat is added to the water until the water exists as...

A piston-cylinder device initially contains 0.3 m3 of nitrogen gas at 350 kPa and 35 ℃.

A piston-cylinder device initially contains 0.3 m3 of nitrogen gas at 350 kPa and 35 ℃. An electric heater within the device is turned on and is allowed to pass a 240W for 6 minutes. Nitrogen expands at constant pressure, and a heat loss of 3000 J occurs during the process. Determine the final temperature of the nitrogen. (Average CP for Nitrogen is 1.039 kJ/kgK and molecular weight of Nitrogen is 28.01 kg/kmol.)

One kilogram of boiling water is vaporized to steam at 100 kPa in a frictionless piston-and-cylinder...

One kilogram of boiling water is vaporized to steam at 100 kPa in a frictionless piston-and-cylinder device. Using the Steam Tables, answer the following: Is the heat needed to vaporize the water to steam equal to the change in enthalpy? Or TDS? To calculate the work done by the steam, is the first law of thermodynamics equation or the general equation for work applicable? Is the entropy generation equal to the change in entropy of the water? Does the heat...

Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 8 bar,...

Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 8 bar, 600 K. The air can be modeled as an ideal gas and kinetic and potential energy effects are negligible. Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. What is the minimum theoretical work input, in kJ per kg of air, for an adiabatic compression from the given initial state to a final pressure of 8 bar? Note...

Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 4 bar,...

Air is compressed adiabatically in a piston–cylinder assembly from 1 bar, 300 K to 4 bar, 600 K. The air can be modeled as an ideal gas and kinetic and potential energy effects are negligible. Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. What is the minimum theoretical work input, in kJ per kg of air, for an adiabatic compression from the given initial state to a final pressure of 4 bar? Note...

A 0.2 m^3 piston/cylinder contains air at 400 K and 400 kPa and receives heat from...

A 0.2 m^3 piston/cylinder contains air at 400 K and 400 kPa and receives heat from a constant temperature heat source at 1300 K. The piston expands at constant pressure to a volume of 0.6 m^3. Determine the change of availability of the system. Assume To= 300K and Po = 100kPa. Answer should be 210.3 kJ.

Thermodynamics An insulated piston/cylinder device contains ideal CO2 gas at 800 kPa, 300 K, which is...

Thermodynamics An insulated piston/cylinder device contains ideal CO2 gas at 800 kPa, 300 K, which is then compressed to 6 MPa in a reversible adiabatic process. Determine the final temperature and the specific work during the compression process using: (a) Ideal gas tables A.8, (b) Constant specific heats A.5.

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.)...

11. A gas in a piston-cylinder device is compressed, and as a result its temperature rises....

11. A gas in a piston-cylinder device is compressed, and as a result its temperature rises. Is this a heat or work interaction?

Question