Question

IDEAL GAS with Compressibility Factor Z correction

Problem 2)

1. Find the specific volume of the gas in Problem 1A(=1.48ft^3/lbm) using the compressibility factor Z.

IDEAL GAS STATE

Problem 1)

1. Air is at 200F and a pressure of 50 psia. Assuming ideal gas estimate the specific volume of this air at this condition.

2. Air at a density of 1.2 kg/m3 is at a pressure of 150 Kpa. Find the temperature of the air assuming ideal gas.

3. Find the specific volume of Helium at a temperature of 400 C and a pressure of 50 kPa assuming ideal gas.

IDEAL GAS with Compressibility Factor Z correction

Problem 2)

1. Find the specific volume of the gas in Problem 1A using the compressibility factor Z.

2. Find the temperature of the gas in Problem 1B using the compressibility factor Z (Hint: use the temp in 1B to find Tr)

SPECIFIC HEAT:

Problem 3) Using the definitions, for steam at P=1Ma T=400C estimate the specific heat (Cp) for constant pressure using the superheated steam chart at this condition. Show your work.

Problem 4) 10 kg of a mystery fluid is heated in a pan at room pressure with 150 kJ input into the fluid which raises the temperature and internal energy of the fluid. The temperature change is 30 C. Assuming the density (ie specific volume) change for the fluid is negligible, estimate the Specific heat Cp. (Hint h=u+pv and density and pressure are constant).

Using chart A-3, guess what type of fluid this is?              Is it water? explain

Problem 5) Helium flowing through a heat exchanger comes in at 300K and leaves at 500K with a mass flowrate of 1 kg/sec. The fluid is at constant pressure through the heat exchanger. Estimate the change in enthalpy (specific) for this fluid as it goes through this system.

2. Find the temperature of the gas in Problem 1B(=435.54k= T) using the compressibility factor Z (Hint: use the temp in 1B to find Tr)

Answer 1