Chapter 6, Problem 6.51P

Number 3

Two rigid tanks are filled with water. Tank A is 0.2 m³ at 100 kPa, 150°C and tank B is 0.3 m³ at saturated vapor 300 kPa. The tanks are connected by a pipe with a closed valve. We open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. Give the two property values that determine the final state and find the heat transfer. B A

During an isentropic process of 3 lb/sec of air, the temperature increases from 50 deg F to 290 deg F. Find the work for a steady flow process.

A 400-L tank, A contains argon gas at 250 kPa, 30°C. Cylinder B, having a frictionless piston of such mass that a pressure of 150 kPa will float it, is initially empty. The valve is opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout. What is the work done by the argon?

Steam (P=100KPa, T=300 deg C, 3 kg) is in a well-insulated piston-cylinder device. The system is cooled (10,000 kJ removed) until all the water is a compressed liquid at 80 deg C. How much work was required (kJ)?

The 1 lb of air has decrease of internal energy of 20.58 Btu while its Fahrenheit temperature is reduced to 1/3 of the initial temperature during a reversible nonflow constant pressure process. Find 1).the initial and final temperatures, 2). heat 3).work

6. Steam expands isentropically from 2 MPa and 375 °C to a final temperature of 95 °C. Find the final quality and the work for a non-flow and steady flow processes.

· A closed gaseous system undergoes a reversible process with constant pressure of 200kpa. 2500 kJ of heat is rejected, and the volume changes from 5m3 to 2m3. Find the change in internal energy

3. Air enters a steady flow compressor at 100 kPa, 27EC and exits at 800 kPa. The process is polytropic with n = 1.3. Determine the specific work and the heat transfer in kJ/kg. Note that this is NOTan adiabatic compressor.