Chapter 6, Problem 6.30P

A mass of 3 kg of water contained in a piston–cylinder assembly expand from an initial state where T1 = 551°C, p1 = 700 kPa to a final state where T2 = 224°C, p2 = 300 kPa, with no significant effects of kinetic and potential energy. It is claimed that the water undergoes an adiabatic process between these states, while developing work. Evaluate entropy production in Joules/k.

1. thermodynamics

The entropy of an ideal gas depends on both T and P. The function s° represents only the temperature-dependent part of entropy.

Pravinbhai

C6 1.

Thermodynamics, please help and show all work please.

ANS COMPLETELY AND SURE

Air expands steadily through a turbine from 6 bar, 800 K to 1 bar, 520 K. During the expan sion, heat transfer from air to the surroundings at 300 K is 10 kJ/kg air. Neglect the changes in kinetic and potential energies and evaluate the irreversibility per kg air. Assume air to behave as an ideal gas with Cp = 1.0 kJ/(kg.K) and R = 0.3 kJ/(kg.K) %3D

Air contained in a rigid, insulated tank fitted with a paddle wheel, initially at 300 K, 2 bar, and a volume of 2 m³, is stirred until its temperature is 600 K. Assuming the ideal gas model for the air, and ignoring kinetic and potential energy, determine: (a) the final pressure, in bar. (b) the work, in kJ. (c) the amount of entropy produced, in kJ/K. Solve using: (1) data from Table A-22. (2) constant c, read from Table A-20 at 400 K.