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4.3 A piston-cylinder device initially contains 0.30 kg of Nitrogen at 130 kPa and 190°C, which is now allowed to expand isothermally to a final pressure of 75 kPa. Compute the boundary work, in kJ.

4.2 A piston-cylinder device initially contains 1 m3 of saturated water liquid at 200°C, which is now expanded isothermally until its quality is 70%. Calculate the final volume and the total work by this expansion.

4.1 Air is compressed polytropically along a path for which n = 1.30 in a closed system. The initial temperature and pressure are 17C and 100 kPa, respectively, and the final pressure is 500 kPa. Assume R = 0.287 kJ/kg K and average specific heats Cv = 0.723 kJ/kg K and Cp = 1.01 kJ/kg K. Calculate: a) the final temperature in K; b) the work done on the gas, in kJ/kg; and c) the change of spec...

4.5. 0.25 kg of steam at 1MPa and 400°C is initially filled inside a piston-cylinder device made with a set of stops. The location of the stops corresponds to 55% of the initial volume. Now the steam is cooled. Determine the compression work if the final state is a) 1MPa and 250°C and b) 500kPa. Also find the temperature at the final state in part b).

4.6. 2 kg of saturated vapor of water at 300 kPa is heated a constant pressure until the temperature changes to 200°C. What is the work done by the steam during this process?

4.14. A saturated mixture of liquid water and vapor at 100°C with 12.3% quality is initially contained in a rigid tank with a volume of 10 L. Heat is then supplied to this mixture until its temperature is 150°C. Calculate the heat transfer required for this process.

4.24. A piston-cylinder device equipped with a paddle wheel contains initially air at 500 kPa and 27°C. Now the paddle wheel supplies 50 kJ/kg of work to the air. During this process heat is transferred to maintain a constant air temperature while allowing the air volume to triple. What is the amount of heat required?

Properties of Pure Substances (Problem 2.2)

Home-made AC

Entropy

Difference between Heat and Work

Zlatan and Entropy

Phase Diagram

Property Tables

Property Tables

1st Law of Thermodynamics

Entropy (Problem 8.9)

Entropy (Problem 8.7)

Entropy (Review)

Entropy (Problem 8.8)

Entropy (Problem 8.5)

Entropy (Problem 8.1)

Rankine cycle (Problem 6.2)

Brayton cycle (Problem 6.3)

Otto cycle (Problem 6.5)

LCFD/ 3D printing an elastic complete heart model (Material: NinjaFlex (85A)):

LCFD/ PIV in the presence of mitral regurgitation

LCFD/ A collage of different PIV measurements in models of heart cavities.