Steam undergoes an isentropic compression in an insulated piston–cylinder assembly from an initial state where T1 = 120°C, p1 = 1 bar to a final state where the pressure p2 = 40 bar. Determine

The following processes occurs in a reversible thermodynamic cycle:   1-2: Reversible polytropic compression at pressure 0.7 bar at volume 0.09 m3 to a pressure 10.4 bar and specific volume 0.7m3/kg. The index of compression may be taken as n. 2-3: Reversibly expansion with expansion index of 2 to pressure 1.9 bar. 3-1: Reversible cooling at constant volume to the initial state.      Calculate the work for the expansion in the process to 2 decimal places.    Not in kilo or mega of unit.

2.3 0.2 m3 of a gas at 105 kPa and 27 0C is compressed until the temperature is 282 0C and the pressure is 1.25 MPa. If the specific heats of gas are Cv = 0.653 and Cp = 0.845 kJ/kg.K, determine,(a) Mass of gas(b) The volume at the end of compression(c) The change in internal energy

The following processes occurs in a reversible thermodynamic cycle:   1-2: Reversible polytropic compression at pressure 0.6 bar at volume 0.09 m3 to a pressure 11.1 bar and specific volume 0.4m3/kg. The index of compression may be taken as n. 2-3: Reversibly expansion with expansion index of 2 to pressure 2.3 bar. 3-1: Reversible cooling at constant volume to the initial state.   Calculate the mass of fluid present to 3 decimal places

1. thermodynamics

The following processes occurs in a reversible thermodynamic cycle:   1-2: Reversible polytropic compression at pressure 0.8 bar at volume 0.1 m3 to a pressure 11 bar and specific volume 0.3m3/kg. The index of compression may be taken as n. 2-3: Reversibly expansion with expansion index of 2 to pressure 2.2 bar. 3-1: Reversible cooling at constant volume to the initial state.   Calculate the work for the compression in the process to 2 decimal places.    Not in kilo or mega.

Refrigerant 134a at p1 = 30 lbş/in?, T1 = 40°F enters a compressor operating at steady state with a mass flow rate of 250 lb/h and exits as saturated vapor at p2 = 160 lbę/in?. Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 2.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr-°R.

2 kg of air contained in a piston-cylinder assembly undergoes a process from the initial state of T₁ = 400K, v₁ = 0.5 m³ to the final state of T₂ = 600K, v₂ = 0.8 m³. Assume the ideal gas model with cv = 0.72 kJ/kg . K for the air. Kinetic and potential energy effects are negligible. - Can this process occur adiabatically? Demonstrate it with formulas and calculations. If yes, determine the work, in kJ, for an adiabatic process between these states. If not, determine the direction of the heat transfer (in or out of the system). Determine the temperature of the isentropic process with the same initial state, T₁ = 400K, v₁ = 0.5 m³, and the same final specific volume: v₂ = 0.8 m³.

5. Steam expands quasi-statically and isothermally from 800 kPa and 200C to a final pressure of 200 kPa. Determine the work done in kJ/kg.

A closed system consisting of 1.3 kg of nitrogen undergoes a polytropic process according to the relation PV1.26 = constant. At initial state, the nitrogen is at a pressure of 65.0 bar and temperature of 369°C. At the final state, the nitrogen is at a temperature of 48°C. What is the work transfer for this system? Express the answer in kJ.