Chapter 8, Problem 8.36P

Q2: Determine the mass of steam at 4 Mn/m2 and specific enthalpy 2600 kl/kg originally, the steam is heated at constant pressure until its temperature becomes 300 C and the heat rate is 60000 kJ. Also state that in temperature and enthalpy diagram.

Initially, the air with 180 kPa pressure and a volume of 1 m3 is heated up to 660 oC. Mass of air 68 kg calculate the entropy change that occurs during this heating process (Ideal gas for air You can use the equations).

A 130 L rigid tank initially contains nitrogen at 400 kPa, 100 K. Thetank is connected to a line which contains nitrogen at 10,000 kPa, 260 K.The valve is opened and nitrogen flows into the tank until half of thetank’s volume is filled with liquid nitrogen, at which point the valve isclosed. During the filling process heat is transferred from the tank tokeep the temperature constant at 100 K. Neglect KE and PE terms.Calculate the final pressure and quality, and the heat transferred inthe process.

Air at 20℃, 100 kPa is compressed in a piston/cylinder without any heat transfer to apressure of 200 kPa. How do the properties (T, v, u and s) change? (increase, aboutthe same or decrease).

Q2: One mole of air at P: and temperature Ti is compressed at constant volume till its pressure doubled. Then it is allowed to expand reversibly and isothermally to the original pressure and finally restored to the originol temperature by cooling at constant pressure. Sketch the processes on a P-V and calculate the net work done by the

Air at 1000 Co, 1.0 MPa expands in a polytropic process with n = 1.3 to a pressure of 250   kPa. Find         1- the final temperature         2- the specific work output

Saturated liquid water at 500 kPa is throttled to a pressure of 200kPa. What is the finial temperature and state of the water? If it is saturated mixture, you need to find the quality.

During an isentropic process of 3 lb/sec of air, the temperature increases from 50 deg F to 290 deg F. Find the change in enthalpy.

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