The refrigerant is now cooled at constant pressure

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 0.1134 kJ/K 1.5 kg compressed liquid Vacuum 300 kPa 60°C FIGURE P7–35 7–36 Reconsider Prob. 7–35. Using EES (or other) software, evaluate and plot the entropy generated as a function of surroundings temperature, and determine the values of the surroundings temperatures that are valid for this problem. Let the surrounding temperature vary from 0 C to 100 C. Discuss your results. 7–37E A piston-cylinder device contains 3 lbm of refrigerant-134a at 120 psia and 120°F. The refrigerant is now cooled at constant pressure until it exists as a liquid at 90°F. Determine the entropy change of the refrigerant during this process. 7–38 An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of l50 kPa. An electric resistance heater inside the cylinder is now turned on, and 2200 kJ of energy is transferred to the steam. Determine the entropy change of the water during this process, in kJ/K. Answer: 5.72 kJ/K 7–39 An insulated piston-cylinder device contains 0.05 m3 of saturated refrigerant-134a vapor at 0.8-MPa pressure. The refrigerant is now allowed to expand i...
View Full Document

This document was uploaded on 11/28/2012.

Ask a homework question - tutors are online