Thermodynamic In a piston-cylinder air at 100 kPa and 15°C undergoes the following cycle. First, it...

Thermodynamic

In a piston-cylinder air at 100 kPa and 15°C undergoes the following cycle. First, it is compressed isentropically to a compression ratio of 20. Then 1800
kJ/kg of heat is transferred to the air at constant pressure. Afterwards the air expands isentropically. In the last step, heat is removed at constant volume until the air reaches its original state. Assuming air behaves as an ideal gas and with Cp and Cv independent of temperature, determine the:
(a) pressure and temperature at each point in the cycle,
(b) thermal efficiency of the cycle, and
(c) mean effective pressure.

Please work by step and orderly to easy work

Solutions

Expert Solution

samet mamat answered 1 year ago

Next > < Previous

Related Solutions

A piston–cylinder device contains steam that undergoes a reversible thermodynamic cycle. Initially the steam is at...

A piston–cylinder device contains steam that undergoes a reversible thermodynamic cycle. Initially the steam is at 400 kPa and 350oC with a volume of 0.3 m3. The steam is first expanded isothermally to 150 kPa, then compressed adiabatically to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine (a) the net work and heat transfer for the cycle after you calculate the work and heat interaction for each process and (b) show the cyclic...

Four kilograms of steam in a piston/cylinder device at 400 kPa and 175 °C undergoes isothermal...

Four kilograms of steam in a piston/cylinder device at 400 kPa and 175 °C undergoes isothermal and mechanically reversible process to a final pressure such that the steam is completely condensed (i.e., became a saturated liquid). Determine Q and W for this process: (b) Using generalized correlations and Equations (6.70 – 6.74). Comment on the accuracy of your answer. [Answer: Q = -9,461 kJ, W = 1494.9 kJ]

A spring loaded piston cylinder contains 1.5 kg of air at 27°C and 160 kPa. It...

A spring loaded piston cylinder contains 1.5 kg of air at 27°C and 160 kPa. It is now heated in a process where pressure is linear in volume, P = A + BV, to twice the initial volume where it reaches 900 K. Find the work, the heat transfer and the total entropy generation assuming a source at 900 K. Is this a possible process?

Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature...

Air is at 100 kPa and 150°C, and undergoes a constant pressure process. The final temperature of the air is 1000°C. a) Compute the specific volume ratio. b) Compute the boundary work (kJ/kg) c) Compute the change in specific internal energy by: 1. Using the tables. 2. Integrating the polynomial (cp) 3. Assuming constant specific heat. d) Repeat c for specific enthalpy e) Compute the heat

Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then...

Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then as a result of heat added the quality increases to 45%, what is the change in volume per one unit of mass (m3/kg)? The piston is assumed to move freely but it is sealed tight that does not allow mass exchange.

An ideal gas is contained in a piston-cylinder device and undergoes a power cycle as follows:...

An ideal gas is contained in a piston-cylinder device and undergoes a power cycle as follows: 1-2 isentropic compression from an initial temperature T1 5 208C with a compression ratio r 5 5 2-3 constant pressure heat addition 3-1 constant volume heat rejection The gas has constant specific heats with cv 5 0.7 kJ/kg·K and R 5 0.3 kJ/kg·K. (a) Sketch the P-v and T-s diagrams for the cycle. (b) Determine the heat and work interactions for each pro- cess,...

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 = 295 K to p2 = 7 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.4, determine the work and heat transfer, each in kJ per kg of air, (1) assuming constant cv evaluated at 300 K. (2) assuming variable specific heats.

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 = 295 K to p2 = 3 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.2, determine the work and heat transfer, each in kJ per kg of air, (1) assuming constant cv evaluated at 300 K. (2) assuming variable specific heats.

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 = 295 K to p2 = 3 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.6, determine the work and heat transfer, each in kJ per kg of air, (1) assuming constant cv evaluated at 300 K. (2) assuming variable specific heats.

A closed piston-cylinder system undergoes a cycle: Process 1 to 2 is an expansion process where...

A closed piston-cylinder system undergoes a cycle: Process 1 to 2 is an expansion process where heat is added. The temperature remains constant. Process 2 to 3 is a constant volume heat addition process. Process 3 to 4 is a compression process where heat is lost. The pressure remains constant. Process 4 to 1 is polytropic expansion, Pvn=constant with n=1.4 and it is adiabatic (Q=0). Assume air, ideal gas, with constant specific heats, k=1.4. R=.287kJ/kgK State 1: T=300K, P=150kPa State...

Subjects